-Upgraded webp to a MUCH newer version. Hoping it fixes some bugs in the process. Keeping old version just in case for now.

-Added ability to convert xml and tscn scenes to binary on export, makes loading of larger scenes faster

5 files changed, 870 insertions, 1719 deletions

diff --git a/drivers/webp/mux/demux.c b/drivers/webp/mux/demux.c
deleted file mode 100644
index 501d08f41d..0000000000
--- a/drivers/webp/mux/demux.c
+++ /dev/null
@@ -1,902 +0,0 @@
-// Copyright 2012 Google Inc. All Rights Reserved.
-//
-// This code is licensed under the same terms as WebM:
-//  Software License Agreement:  http://www.webmproject.org/license/software/
-//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
-// -----------------------------------------------------------------------------
-//
-//  WebP container demux.
-//
-
-#include "../mux.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "../decode.h"  // WebPGetInfo
-#include "../format_constants.h"
-
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
-#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
-
-typedef struct {
-  size_t start_;        // start location of the data
-  size_t end_;          // end location
-  size_t riff_end_;     // riff chunk end location, can be > end_.
-  size_t buf_size_;     // size of the buffer
-  const uint8_t* buf_;
-} MemBuffer;
-
-typedef struct {
-  size_t offset_;
-  size_t size_;
-} ChunkData;
-
-typedef struct Frame {
-  int x_offset_, y_offset_;
-  int width_, height_;
-  int duration_;
-  int is_tile_;    // this is an image fragment from a 'TILE'.
-  int frame_num_;  // the referent frame number for use in assembling tiles.
-  int complete_;   // img_components_ contains a full image.
-  ChunkData img_components_[2];  // 0=VP8{,L} 1=ALPH
-  struct Frame* next_;
-} Frame;
-
-typedef struct Chunk {
-  ChunkData data_;
-  struct Chunk* next_;
-} Chunk;
-
-struct WebPDemuxer {
-  MemBuffer mem_;
-  WebPDemuxState state_;
-  int is_ext_format_;
-  uint32_t feature_flags_;
-  int canvas_width_, canvas_height_;
-  int loop_count_;
-  int num_frames_;
-  Frame* frames_;
-  Chunk* chunks_;  // non-image chunks
-};
-
-typedef enum {
-  PARSE_OK,
-  PARSE_NEED_MORE_DATA,
-  PARSE_ERROR
-} ParseStatus;
-
-typedef struct ChunkParser {
-  uint8_t id[4];
-  ParseStatus (*parse)(WebPDemuxer* const dmux);
-  int (*valid)(const WebPDemuxer* const dmux);
-} ChunkParser;
-
-static ParseStatus ParseSingleImage(WebPDemuxer* const dmux);
-static ParseStatus ParseVP8X(WebPDemuxer* const dmux);
-static int IsValidSimpleFormat(const WebPDemuxer* const dmux);
-static int IsValidExtendedFormat(const WebPDemuxer* const dmux);
-
-static const ChunkParser kMasterChunks[] = {
-  { { 'V', 'P', '8', ' ' }, ParseSingleImage, IsValidSimpleFormat },
-  { { 'V', 'P', '8', 'L' }, ParseSingleImage, IsValidSimpleFormat },
-  { { 'V', 'P', '8', 'X' }, ParseVP8X,        IsValidExtendedFormat },
-  { { '0', '0', '0', '0' }, NULL,             NULL },
-};
-
-// -----------------------------------------------------------------------------
-// MemBuffer
-
-static int RemapMemBuffer(MemBuffer* const mem,
-                          const uint8_t* data, size_t size) {
-  if (size < mem->buf_size_) return 0;  // can't remap to a shorter buffer!
-
-  mem->buf_ = data;
-  mem->end_ = mem->buf_size_ = size;
-  return 1;
-}
-
-static int InitMemBuffer(MemBuffer* const mem,
-                         const uint8_t* data, size_t size) {
-  memset(mem, 0, sizeof(*mem));
-  return RemapMemBuffer(mem, data, size);
-}
-
-// Return the remaining data size available in 'mem'.
-static WEBP_INLINE size_t MemDataSize(const MemBuffer* const mem) {
-  return (mem->end_ - mem->start_);
-}
-
-// Return true if 'size' exceeds the end of the RIFF chunk.
-static WEBP_INLINE int SizeIsInvalid(const MemBuffer* const mem, size_t size) {
-  return (size > mem->riff_end_ - mem->start_);
-}
-
-static WEBP_INLINE void Skip(MemBuffer* const mem, size_t size) {
-  mem->start_ += size;
-}
-
-static WEBP_INLINE void Rewind(MemBuffer* const mem, size_t size) {
-  mem->start_ -= size;
-}
-
-static WEBP_INLINE const uint8_t* GetBuffer(MemBuffer* const mem) {
-  return mem->buf_ + mem->start_;
-}
-
-static WEBP_INLINE uint8_t GetByte(MemBuffer* const mem) {
-  const uint8_t byte = mem->buf_[mem->start_];
-  Skip(mem, 1);
-  return byte;
-}
-
-// Read 16, 24 or 32 bits stored in little-endian order.
-static WEBP_INLINE int ReadLE16s(const uint8_t* const data) {
-  return (int)(data[0] << 0) | (data[1] << 8);
-}
-
-static WEBP_INLINE int ReadLE24s(const uint8_t* const data) {
-  return ReadLE16s(data) | (data[2] << 16);
-}
-
-static WEBP_INLINE uint32_t ReadLE32(const uint8_t* const data) {
-  return (uint32_t)ReadLE24s(data) | (data[3] << 24);
-}
-
-// In addition to reading, skip the read bytes.
-static WEBP_INLINE int GetLE16s(MemBuffer* const mem) {
-  const uint8_t* const data = mem->buf_ + mem->start_;
-  const int val = ReadLE16s(data);
-  Skip(mem, 2);
-  return val;
-}
-
-static WEBP_INLINE int GetLE24s(MemBuffer* const mem) {
-  const uint8_t* const data = mem->buf_ + mem->start_;
-  const int val = ReadLE24s(data);
-  Skip(mem, 3);
-  return val;
-}
-
-static WEBP_INLINE uint32_t GetLE32(MemBuffer* const mem) {
-  const uint8_t* const data = mem->buf_ + mem->start_;
-  const uint32_t val = ReadLE32(data);
-  Skip(mem, 4);
-  return val;
-}
-
-// -----------------------------------------------------------------------------
-// Secondary chunk parsing
-
-static void AddChunk(WebPDemuxer* const dmux, Chunk* const chunk) {
-  Chunk** c = &dmux->chunks_;
-  while (*c != NULL) c = &(*c)->next_;
-  *c = chunk;
-  chunk->next_ = NULL;
-}
-
-// Add a frame to the end of the list, ensuring the last frame is complete.
-// Returns true on success, false otherwise.
-static int AddFrame(WebPDemuxer* const dmux, Frame* const frame) {
-  const Frame* last_frame = NULL;
-  Frame** f = &dmux->frames_;
-  while (*f != NULL) {
-    last_frame = *f;
-    f = &(*f)->next_;
-  }
-  if (last_frame != NULL && !last_frame->complete_) return 0;
-  *f = frame;
-  frame->next_ = NULL;
-  return 1;
-}
-
-// Store image bearing chunks to 'frame'.
-static ParseStatus StoreFrame(int frame_num, MemBuffer* const mem,
-                              Frame* const frame) {
-  int alpha_chunks = 0;
-  int image_chunks = 0;
-  int done = (MemDataSize(mem) < CHUNK_HEADER_SIZE);
-  ParseStatus status = PARSE_OK;
-
-  if (done) return PARSE_NEED_MORE_DATA;
-
-  do {
-    const size_t chunk_start_offset = mem->start_;
-    const uint32_t fourcc = GetLE32(mem);
-    const uint32_t payload_size = GetLE32(mem);
-    const uint32_t payload_size_padded = payload_size + (payload_size & 1);
-    const size_t payload_available = (payload_size_padded > MemDataSize(mem))
-                                   ? MemDataSize(mem) : payload_size_padded;
-    const size_t chunk_size = CHUNK_HEADER_SIZE + payload_available;
-
-    if (payload_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR;
-    if (SizeIsInvalid(mem, payload_size_padded)) return PARSE_ERROR;
-    if (payload_size_padded > MemDataSize(mem)) status = PARSE_NEED_MORE_DATA;
-
-    switch (fourcc) {
-      case MKFOURCC('A', 'L', 'P', 'H'):
-        if (alpha_chunks == 0) {
-          ++alpha_chunks;
-          frame->img_components_[1].offset_ = chunk_start_offset;
-          frame->img_components_[1].size_ = chunk_size;
-          frame->frame_num_ = frame_num;
-          Skip(mem, payload_available);
-        } else {
-          goto Done;
-        }
-        break;
-      case MKFOURCC('V', 'P', '8', ' '):
-      case MKFOURCC('V', 'P', '8', 'L'):
-        if (image_chunks == 0) {
-          int width = 0, height = 0;
-          ++image_chunks;
-          frame->img_components_[0].offset_ = chunk_start_offset;
-          frame->img_components_[0].size_ = chunk_size;
-          // Extract the width and height from the bitstream, tolerating
-          // failures when the data is incomplete.
-          if (!WebPGetInfo(mem->buf_ + frame->img_components_[0].offset_,
-                           frame->img_components_[0].size_, &width, &height) &&
-              status != PARSE_NEED_MORE_DATA) {
-            return PARSE_ERROR;
-          }
-
-          frame->width_ = width;
-          frame->height_ = height;
-          frame->frame_num_ = frame_num;
-          frame->complete_ = (status == PARSE_OK);
-          Skip(mem, payload_available);
-        } else {
-          goto Done;
-        }
-        break;
- Done:
-      default:
-        // Restore fourcc/size when moving up one level in parsing.
-        Rewind(mem, CHUNK_HEADER_SIZE);
-        done = 1;
-        break;
-    }
-
-    if (mem->start_ == mem->riff_end_) {
-      done = 1;
-    } else if (MemDataSize(mem) < CHUNK_HEADER_SIZE) {
-      status = PARSE_NEED_MORE_DATA;
-    }
-  } while (!done && status == PARSE_OK);
-
-  return status;
-}
-
-// Creates a new Frame if 'actual_size' is within bounds and 'mem' contains
-// enough data ('min_size') to parse the payload.
-// Returns PARSE_OK on success with *frame pointing to the new Frame.
-// Returns PARSE_NEED_MORE_DATA with insufficient data, PARSE_ERROR otherwise.
-static ParseStatus NewFrame(const MemBuffer* const mem,
-                            uint32_t min_size, uint32_t expected_size,
-                            uint32_t actual_size, Frame** frame) {
-  if (SizeIsInvalid(mem, min_size)) return PARSE_ERROR;
-  if (actual_size < expected_size) return PARSE_ERROR;
-  if (MemDataSize(mem) < min_size)  return PARSE_NEED_MORE_DATA;
-
-  *frame = (Frame*)calloc(1, sizeof(**frame));
-  return (*frame == NULL) ? PARSE_ERROR : PARSE_OK;
-}
-
-// Parse a 'FRM ' chunk and any image bearing chunks that immediately follow.
-// 'frame_chunk_size' is the previously validated, padded chunk size.
-static ParseStatus ParseFrame(
-    WebPDemuxer* const dmux, uint32_t frame_chunk_size) {
-  const int has_frames = !!(dmux->feature_flags_ & ANIMATION_FLAG);
-  const uint32_t min_size = frame_chunk_size + CHUNK_HEADER_SIZE;
-  int added_frame = 0;
-  MemBuffer* const mem = &dmux->mem_;
-  Frame* frame;
-  ParseStatus status =
-      NewFrame(mem, min_size, FRAME_CHUNK_SIZE, frame_chunk_size, &frame);
-  if (status != PARSE_OK) return status;
-
-  frame->x_offset_ = 2 * GetLE24s(mem);
-  frame->y_offset_ = 2 * GetLE24s(mem);
-  frame->width_    = 1 + GetLE24s(mem);
-  frame->height_   = 1 + GetLE24s(mem);
-  frame->duration_ = 1 + GetLE24s(mem);
-  Skip(mem, frame_chunk_size - FRAME_CHUNK_SIZE);  // skip any trailing data.
-  if (frame->width_ * (uint64_t)frame->height_ >= MAX_IMAGE_AREA) {
-    return PARSE_ERROR;
-  }
-
-  // Store a (potentially partial) frame only if the animation flag is set
-  // and there is some data in 'frame'.
-  status = StoreFrame(dmux->num_frames_ + 1, mem, frame);
-  if (status != PARSE_ERROR && has_frames && frame->frame_num_ > 0) {
-    added_frame = AddFrame(dmux, frame);
-    if (added_frame) {
-      ++dmux->num_frames_;
-    } else {
-      status = PARSE_ERROR;
-    }
-  }
-
-  if (!added_frame) free(frame);
-  return status;
-}
-
-// Parse a 'TILE' chunk and any image bearing chunks that immediately follow.
-// 'tile_chunk_size' is the previously validated, padded chunk size.
-static ParseStatus ParseTile(WebPDemuxer* const dmux,
-                             uint32_t tile_chunk_size) {
-  const int has_tiles = !!(dmux->feature_flags_ & TILE_FLAG);
-  const uint32_t min_size = tile_chunk_size + CHUNK_HEADER_SIZE;
-  int added_tile = 0;
-  MemBuffer* const mem = &dmux->mem_;
-  Frame* frame;
-  ParseStatus status =
-      NewFrame(mem, min_size, TILE_CHUNK_SIZE, tile_chunk_size, &frame);
-  if (status != PARSE_OK) return status;
-
-  frame->is_tile_  = 1;
-  frame->x_offset_ = 2 * GetLE24s(mem);
-  frame->y_offset_ = 2 * GetLE24s(mem);
-  Skip(mem, tile_chunk_size - TILE_CHUNK_SIZE);  // skip any trailing data.
-
-  // Store a (potentially partial) tile only if the tile flag is set
-  // and the tile contains some data.
-  status = StoreFrame(dmux->num_frames_, mem, frame);
-  if (status != PARSE_ERROR && has_tiles && frame->frame_num_ > 0) {
-    // Note num_frames_ is incremented only when all tiles have been consumed.
-    added_tile = AddFrame(dmux, frame);
-    if (!added_tile) status = PARSE_ERROR;
-  }
-
-  if (!added_tile) free(frame);
-  return status;
-}
-
-// General chunk storage starting with the header at 'start_offset' allowing
-// the user to request the payload via a fourcc string. 'size' includes the
-// header and the unpadded payload size.
-// Returns true on success, false otherwise.
-static int StoreChunk(WebPDemuxer* const dmux,
-                      size_t start_offset, uint32_t size) {
-  Chunk* const chunk = (Chunk*)calloc(1, sizeof(*chunk));
-  if (chunk == NULL) return 0;
-
-  chunk->data_.offset_ = start_offset;
-  chunk->data_.size_ = size;
-  AddChunk(dmux, chunk);
-  return 1;
-}
-
-// -----------------------------------------------------------------------------
-// Primary chunk parsing
-
-static int ReadHeader(MemBuffer* const mem) {
-  const size_t min_size = RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE;
-  uint32_t riff_size;
-
-  // Basic file level validation.
-  if (MemDataSize(mem) < min_size) return 0;
-  if (memcmp(GetBuffer(mem), "RIFF", CHUNK_SIZE_BYTES) ||
-      memcmp(GetBuffer(mem) + CHUNK_HEADER_SIZE, "WEBP", CHUNK_SIZE_BYTES)) {
-    return 0;
-  }
-
-  riff_size = ReadLE32(GetBuffer(mem) + TAG_SIZE);
-  if (riff_size < CHUNK_HEADER_SIZE) return 0;
-  if (riff_size > MAX_CHUNK_PAYLOAD) return 0;
-
-  // There's no point in reading past the end of the RIFF chunk
-  mem->riff_end_ = riff_size + CHUNK_HEADER_SIZE;
-  if (mem->buf_size_ > mem->riff_end_) {
-    mem->buf_size_ = mem->end_ = mem->riff_end_;
-  }
-
-  Skip(mem, RIFF_HEADER_SIZE);
-  return 1;
-}
-
-static ParseStatus ParseSingleImage(WebPDemuxer* const dmux) {
-  const size_t min_size = CHUNK_HEADER_SIZE;
-  MemBuffer* const mem = &dmux->mem_;
-  Frame* frame;
-  ParseStatus status;
-
-  if (dmux->frames_ != NULL) return PARSE_ERROR;
-  if (SizeIsInvalid(mem, min_size)) return PARSE_ERROR;
-  if (MemDataSize(mem) < min_size) return PARSE_NEED_MORE_DATA;
-
-  frame = (Frame*)calloc(1, sizeof(*frame));
-  if (frame == NULL) return PARSE_ERROR;
-
-  status = StoreFrame(1, &dmux->mem_, frame);
-  if (status != PARSE_ERROR) {
-    const int has_alpha = !!(dmux->feature_flags_ & ALPHA_FLAG);
-    // Clear any alpha when the alpha flag is missing.
-    if (!has_alpha && frame->img_components_[1].size_ > 0) {
-      frame->img_components_[1].offset_ = 0;
-      frame->img_components_[1].size_ = 0;
-    }
-
-    // Use the frame width/height as the canvas values for non-vp8x files.
-    if (!dmux->is_ext_format_ && frame->width_ > 0 && frame->height_ > 0) {
-      dmux->state_ = WEBP_DEMUX_PARSED_HEADER;
-      dmux->canvas_width_ = frame->width_;
-      dmux->canvas_height_ = frame->height_;
-    }
-    AddFrame(dmux, frame);
-    dmux->num_frames_ = 1;
-  } else {
-    free(frame);
-  }
-
-  return status;
-}
-
-static ParseStatus ParseVP8X(WebPDemuxer* const dmux) {
-  MemBuffer* const mem = &dmux->mem_;
-  int loop_chunks = 0;
-  uint32_t vp8x_size;
-  ParseStatus status = PARSE_OK;
-
-  if (MemDataSize(mem) < CHUNK_HEADER_SIZE) return PARSE_NEED_MORE_DATA;
-
-  dmux->is_ext_format_ = 1;
-  Skip(mem, TAG_SIZE);  // VP8X
-  vp8x_size = GetLE32(mem);
-  if (vp8x_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR;
-  if (vp8x_size < VP8X_CHUNK_SIZE) return PARSE_ERROR;
-  vp8x_size += vp8x_size & 1;
-  if (SizeIsInvalid(mem, vp8x_size)) return PARSE_ERROR;
-  if (MemDataSize(mem) < vp8x_size) return PARSE_NEED_MORE_DATA;
-
-  dmux->feature_flags_ = GetByte(mem);
-  Skip(mem, 3);  // Reserved.
-  dmux->canvas_width_  = 1 + GetLE24s(mem);
-  dmux->canvas_height_ = 1 + GetLE24s(mem);
-  if (dmux->canvas_width_ * (uint64_t)dmux->canvas_height_ >= MAX_IMAGE_AREA) {
-    return PARSE_ERROR;  // image final dimension is too large
-  }
-  Skip(mem, vp8x_size - VP8X_CHUNK_SIZE);  // skip any trailing data.
-  dmux->state_ = WEBP_DEMUX_PARSED_HEADER;
-
-  if (SizeIsInvalid(mem, CHUNK_HEADER_SIZE)) return PARSE_ERROR;
-  if (MemDataSize(mem) < CHUNK_HEADER_SIZE) return PARSE_NEED_MORE_DATA;
-
-  do {
-    int store_chunk = 1;
-    const size_t chunk_start_offset = mem->start_;
-    const uint32_t fourcc = GetLE32(mem);
-    const uint32_t chunk_size = GetLE32(mem);
-    const uint32_t chunk_size_padded = chunk_size + (chunk_size & 1);
-
-    if (chunk_size > MAX_CHUNK_PAYLOAD) return PARSE_ERROR;
-    if (SizeIsInvalid(mem, chunk_size_padded)) return PARSE_ERROR;
-
-    switch (fourcc) {
-      case MKFOURCC('V', 'P', '8', 'X'): {
-        return PARSE_ERROR;
-      }
-      case MKFOURCC('A', 'L', 'P', 'H'):
-      case MKFOURCC('V', 'P', '8', ' '):
-      case MKFOURCC('V', 'P', '8', 'L'): {
-        Rewind(mem, CHUNK_HEADER_SIZE);
-        status = ParseSingleImage(dmux);
-        break;
-      }
-      case MKFOURCC('L', 'O', 'O', 'P'): {
-        if (chunk_size_padded < LOOP_CHUNK_SIZE) return PARSE_ERROR;
-
-        if (MemDataSize(mem) < chunk_size_padded) {
-          status = PARSE_NEED_MORE_DATA;
-        } else if (loop_chunks == 0) {
-          ++loop_chunks;
-          dmux->loop_count_ = GetLE16s(mem);
-          Skip(mem, chunk_size_padded - LOOP_CHUNK_SIZE);
-        } else {
-          store_chunk = 0;
-          goto Skip;
-        }
-        break;
-      }
-      case MKFOURCC('F', 'R', 'M', ' '): {
-        status = ParseFrame(dmux, chunk_size_padded);
-        break;
-      }
-      case MKFOURCC('T', 'I', 'L', 'E'): {
-        if (dmux->num_frames_ == 0) dmux->num_frames_ = 1;
-        status = ParseTile(dmux, chunk_size_padded);
-        break;
-      }
-      case MKFOURCC('I', 'C', 'C', 'P'): {
-        store_chunk = !!(dmux->feature_flags_ & ICCP_FLAG);
-        goto Skip;
-      }
-      case MKFOURCC('M', 'E', 'T', 'A'): {
-        store_chunk = !!(dmux->feature_flags_ & META_FLAG);
-        goto Skip;
-      }
- Skip:
-      default: {
-        if (chunk_size_padded <= MemDataSize(mem)) {
-          if (store_chunk) {
-            // Store only the chunk header and unpadded size as only the payload
-            // will be returned to the user.
-            if (!StoreChunk(dmux, chunk_start_offset,
-                            CHUNK_HEADER_SIZE + chunk_size)) {
-              return PARSE_ERROR;
-            }
-          }
-          Skip(mem, chunk_size_padded);
-        } else {
-          status = PARSE_NEED_MORE_DATA;
-        }
-      }
-    }
-
-    if (mem->start_ == mem->riff_end_) {
-      break;
-    } else if (MemDataSize(mem) < CHUNK_HEADER_SIZE) {
-      status = PARSE_NEED_MORE_DATA;
-    }
-  } while (status == PARSE_OK);
-
-  return status;
-}
-
-// -----------------------------------------------------------------------------
-// Format validation
-
-static int IsValidSimpleFormat(const WebPDemuxer* const dmux) {
-  const Frame* const frame = dmux->frames_;
-  if (dmux->state_ == WEBP_DEMUX_PARSING_HEADER) return 1;
-
-  if (dmux->canvas_width_ <= 0 || dmux->canvas_height_ <= 0) return 0;
-  if (dmux->state_ == WEBP_DEMUX_DONE && frame == NULL) return 0;
-
-  if (frame->width_ <= 0 || frame->height_ <= 0) return 0;
-  return 1;
-}
-
-static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
-  const int has_tiles = !!(dmux->feature_flags_ & TILE_FLAG);
-  const int has_frames = !!(dmux->feature_flags_ & ANIMATION_FLAG);
-  const Frame* f;
-
-  if (dmux->state_ == WEBP_DEMUX_PARSING_HEADER) return 1;
-
-  if (dmux->canvas_width_ <= 0 || dmux->canvas_height_ <= 0) return 0;
-  if (dmux->loop_count_ < 0) return 0;
-  if (dmux->state_ == WEBP_DEMUX_DONE && dmux->frames_ == NULL) return 0;
-
-  for (f = dmux->frames_; f != NULL; f = f->next_) {
-    const int cur_frame_set = f->frame_num_;
-    int frame_count = 0, tile_count = 0;
-
-    // Check frame properties and if the image is composed of tiles that each
-    // fragment came from a 'TILE'.
-    for (; f != NULL && f->frame_num_ == cur_frame_set; f = f->next_) {
-      const ChunkData* const image = f->img_components_;
-      const ChunkData* const alpha = f->img_components_ + 1;
-
-      if (!has_tiles && f->is_tile_) return 0;
-      if (!has_frames && f->frame_num_ > 1) return 0;
-      if (f->x_offset_ < 0 || f->y_offset_ < 0) return 0;
-      if (f->complete_) {
-        if (alpha->size_ == 0 && image->size_ == 0) return 0;
-        // Ensure alpha precedes image bitstream.
-        if (alpha->size_ > 0 && alpha->offset_ > image->offset_) {
-          return 0;
-        }
-
-        if (f->width_ <= 0 || f->height_ <= 0) return 0;
-      } else {
-        // Ensure alpha precedes image bitstream.
-        if (alpha->size_ > 0 && image->size_ > 0 &&
-            alpha->offset_ > image->offset_) {
-          return 0;
-        }
-        // There shouldn't be any frames after an incomplete one.
-        if (f->next_ != NULL) return 0;
-      }
-
-      tile_count += f->is_tile_;
-      ++frame_count;
-    }
-    if (!has_tiles && frame_count > 1) return 0;
-    if (tile_count > 0 && frame_count != tile_count) return 0;
-    if (f == NULL) break;
-  }
-  return 1;
-}
-
-// -----------------------------------------------------------------------------
-// WebPDemuxer object
-
-static void InitDemux(WebPDemuxer* const dmux, const MemBuffer* const mem) {
-  dmux->state_ = WEBP_DEMUX_PARSING_HEADER;
-  dmux->loop_count_ = 1;
-  dmux->canvas_width_ = -1;
-  dmux->canvas_height_ = -1;
-  dmux->mem_ = *mem;
-}
-
-WebPDemuxer* WebPDemuxInternal(const WebPData* data, int allow_partial,
-                               WebPDemuxState* state, int version) {
-  const ChunkParser* parser;
-  int partial;
-  ParseStatus status = PARSE_ERROR;
-  MemBuffer mem;
-  WebPDemuxer* dmux;
-
-  if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DEMUX_ABI_VERSION)) return NULL;
-  if (data == NULL || data->bytes_ == NULL || data->size_ == 0) return NULL;
-
-  if (!InitMemBuffer(&mem, data->bytes_, data->size_)) return NULL;
-  if (!ReadHeader(&mem)) return NULL;
-
-  partial = (mem.buf_size_ < mem.riff_end_);
-  if (!allow_partial && partial) return NULL;
-
-  dmux = (WebPDemuxer*)calloc(1, sizeof(*dmux));
-  if (dmux == NULL) return NULL;
-  InitDemux(dmux, &mem);
-
-  for (parser = kMasterChunks; parser->parse != NULL; ++parser) {
-    if (!memcmp(parser->id, GetBuffer(&dmux->mem_), TAG_SIZE)) {
-      status = parser->parse(dmux);
-      if (status == PARSE_OK) dmux->state_ = WEBP_DEMUX_DONE;
-      if (status != PARSE_ERROR && !parser->valid(dmux)) status = PARSE_ERROR;
-      break;
-    }
-  }
-  if (state) *state = dmux->state_;
-
-  if (status == PARSE_ERROR) {
-    WebPDemuxDelete(dmux);
-    return NULL;
-  }
-  return dmux;
-}
-
-void WebPDemuxDelete(WebPDemuxer* dmux) {
-  Chunk* c;
-  Frame* f;
-  if (dmux == NULL) return;
-
-  for (f = dmux->frames_; f != NULL;) {
-    Frame* const cur_frame = f;
-    f = f->next_;
-    free(cur_frame);
-  }
-  for (c = dmux->chunks_; c != NULL;) {
-    Chunk* const cur_chunk = c;
-    c = c->next_;
-    free(cur_chunk);
-  }
-  free(dmux);
-}
-
-// -----------------------------------------------------------------------------
-
-uint32_t WebPDemuxGetI(const WebPDemuxer* dmux, WebPFormatFeature feature) {
-  if (dmux == NULL) return 0;
-
-  switch (feature) {
-    case WEBP_FF_FORMAT_FLAGS:  return dmux->feature_flags_;
-    case WEBP_FF_CANVAS_WIDTH:  return (uint32_t)dmux->canvas_width_;
-    case WEBP_FF_CANVAS_HEIGHT: return (uint32_t)dmux->canvas_height_;
-    case WEBP_FF_LOOP_COUNT:    return (uint32_t)dmux->loop_count_;
-  }
-  return 0;
-}
-
-// -----------------------------------------------------------------------------
-// Frame iteration
-
-// Find the first 'frame_num' frame. There may be multiple in a tiled frame.
-static const Frame* GetFrame(const WebPDemuxer* const dmux, int frame_num) {
-  const Frame* f;
-  for (f = dmux->frames_; f != NULL; f = f->next_) {
-    if (frame_num == f->frame_num_) break;
-  }
-  return f;
-}
-
-// Returns tile 'tile_num' and the total count.
-static const Frame* GetTile(
-    const Frame* const frame_set, int tile_num, int* const count) {
-  const int this_frame = frame_set->frame_num_;
-  const Frame* f = frame_set;
-  const Frame* tile = NULL;
-  int total;
-
-  for (total = 0; f != NULL && f->frame_num_ == this_frame; f = f->next_) {
-    if (++total == tile_num) tile = f;
-  }
-  *count = total;
-  return tile;
-}
-
-static const uint8_t* GetFramePayload(const uint8_t* const mem_buf,
-                                      const Frame* const frame,
-                                      size_t* const data_size) {
-  *data_size = 0;
-  if (frame != NULL) {
-    const ChunkData* const image = frame->img_components_;
-    const ChunkData* const alpha = frame->img_components_ + 1;
-    size_t start_offset = image->offset_;
-    *data_size = image->size_;
-
-    // if alpha exists it precedes image, update the size allowing for
-    // intervening chunks.
-    if (alpha->size_ > 0) {
-      const size_t inter_size = (image->offset_ > 0)
-                              ? image->offset_ - (alpha->offset_ + alpha->size_)
-                              : 0;
-      start_offset = alpha->offset_;
-      *data_size  += alpha->size_ + inter_size;
-    }
-    return mem_buf + start_offset;
-  }
-  return NULL;
-}
-
-// Create a whole 'frame' from VP8 (+ alpha) or lossless.
-static int SynthesizeFrame(const WebPDemuxer* const dmux,
-                           const Frame* const first_frame,
-                           int tile_num, WebPIterator* const iter) {
-  const uint8_t* const mem_buf = dmux->mem_.buf_;
-  int num_tiles;
-  size_t payload_size = 0;
-  const Frame* const tile = GetTile(first_frame, tile_num, &num_tiles);
-  const uint8_t* const payload = GetFramePayload(mem_buf, tile, &payload_size);
-  if (payload == NULL) return 0;
-
-  iter->frame_num_   = first_frame->frame_num_;
-  iter->num_frames_  = dmux->num_frames_;
-  iter->tile_num_    = tile_num;
-  iter->num_tiles_   = num_tiles;
-  iter->x_offset_    = tile->x_offset_;
-  iter->y_offset_    = tile->y_offset_;
-  iter->width_       = tile->width_;
-  iter->height_      = tile->height_;
-  iter->duration_    = tile->duration_;
-  iter->complete_    = tile->complete_;
-  iter->tile_.bytes_ = payload;
-  iter->tile_.size_  = payload_size;
-  // TODO(jzern): adjust offsets for 'TILE's embedded in 'FRM 's
-  return 1;
-}
-
-static int SetFrame(int frame_num, WebPIterator* const iter) {
-  const Frame* frame;
-  const WebPDemuxer* const dmux = (WebPDemuxer*)iter->private_;
-  if (dmux == NULL || frame_num < 0) return 0;
-  if (frame_num > dmux->num_frames_) return 0;
-  if (frame_num == 0) frame_num = dmux->num_frames_;
-
-  frame = GetFrame(dmux, frame_num);
-  return SynthesizeFrame(dmux, frame, 1, iter);
-}
-
-int WebPDemuxGetFrame(const WebPDemuxer* dmux, int frame, WebPIterator* iter) {
-  if (iter == NULL) return 0;
-
-  memset(iter, 0, sizeof(*iter));
-  iter->private_ = (void*)dmux;
-  return SetFrame(frame, iter);
-}
-
-int WebPDemuxNextFrame(WebPIterator* iter) {
-  if (iter == NULL) return 0;
-  return SetFrame(iter->frame_num_ + 1, iter);
-}
-
-int WebPDemuxPrevFrame(WebPIterator* iter) {
-  if (iter == NULL) return 0;
-  if (iter->frame_num_ <= 1) return 0;
-  return SetFrame(iter->frame_num_ - 1, iter);
-}
-
-int WebPDemuxSelectTile(WebPIterator* iter, int tile) {
-  if (iter != NULL && iter->private_ != NULL && tile > 0) {
-    const WebPDemuxer* const dmux = (WebPDemuxer*)iter->private_;
-    const Frame* const frame = GetFrame(dmux, iter->frame_num_);
-    if (frame == NULL) return 0;
-
-    return SynthesizeFrame(dmux, frame, tile, iter);
-  }
-  return 0;
-}
-
-void WebPDemuxReleaseIterator(WebPIterator* iter) {
-  (void)iter;
-}
-
-// -----------------------------------------------------------------------------
-// Chunk iteration
-
-static int ChunkCount(const WebPDemuxer* const dmux, const char fourcc[4]) {
-  const uint8_t* const mem_buf = dmux->mem_.buf_;
-  const Chunk* c;
-  int count = 0;
-  for (c = dmux->chunks_; c != NULL; c = c->next_) {
-    const uint8_t* const header = mem_buf + c->data_.offset_;
-    if (!memcmp(header, fourcc, TAG_SIZE)) ++count;
-  }
-  return count;
-}
-
-static const Chunk* GetChunk(const WebPDemuxer* const dmux,
-                             const char fourcc[4], int chunk_num) {
-  const uint8_t* const mem_buf = dmux->mem_.buf_;
-  const Chunk* c;
-  int count = 0;
-  for (c = dmux->chunks_; c != NULL; c = c->next_) {
-    const uint8_t* const header = mem_buf + c->data_.offset_;
-    if (!memcmp(header, fourcc, TAG_SIZE)) ++count;
-    if (count == chunk_num) break;
-  }
-  return c;
-}
-
-static int SetChunk(const char fourcc[4], int chunk_num,
-                    WebPChunkIterator* const iter) {
-  const WebPDemuxer* const dmux = (WebPDemuxer*)iter->private_;
-  int count;
-
-  if (dmux == NULL || fourcc == NULL || chunk_num < 0) return 0;
-  count = ChunkCount(dmux, fourcc);
-  if (count == 0) return 0;
-  if (chunk_num == 0) chunk_num = count;
-
-  if (chunk_num <= count) {
-    const uint8_t* const mem_buf = dmux->mem_.buf_;
-    const Chunk* const chunk = GetChunk(dmux, fourcc, chunk_num);
-    iter->chunk_.bytes_ = mem_buf + chunk->data_.offset_ + CHUNK_HEADER_SIZE;
-    iter->chunk_.size_  = chunk->data_.size_ - CHUNK_HEADER_SIZE;
-    iter->num_chunks_   = count;
-    iter->chunk_num_    = chunk_num;
-    return 1;
-  }
-  return 0;
-}
-
-int WebPDemuxGetChunk(const WebPDemuxer* dmux,
-                      const char fourcc[4], int chunk_num,
-                      WebPChunkIterator* iter) {
-  if (iter == NULL) return 0;
-
-  memset(iter, 0, sizeof(*iter));
-  iter->private_ = (void*)dmux;
-  return SetChunk(fourcc, chunk_num, iter);
-}
-
-int WebPDemuxNextChunk(WebPChunkIterator* iter) {
-  if (iter != NULL) {
-    const char* const fourcc =
-        (const char*)iter->chunk_.bytes_ - CHUNK_HEADER_SIZE;
-    return SetChunk(fourcc, iter->chunk_num_ + 1, iter);
-  }
-  return 0;
-}
-
-int WebPDemuxPrevChunk(WebPChunkIterator* iter) {
-  if (iter != NULL && iter->chunk_num_ > 1) {
-    const char* const fourcc =
-        (const char*)iter->chunk_.bytes_ - CHUNK_HEADER_SIZE;
-    return SetChunk(fourcc, iter->chunk_num_ - 1, iter);
-  }
-  return 0;
-}
-
-void WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter) {
-  (void)iter;
-}
-
-#if defined(__cplusplus) || defined(c_plusplus)
-}  // extern "C"
-#endif
diff --git a/drivers/webp/mux/muxedit.c b/drivers/webp/mux/muxedit.c
index 08629d4ae2..b27663f87a 100644
--- a/drivers/webp/mux/muxedit.c
+++ b/drivers/webp/mux/muxedit.c
@@ -1,8 +1,10 @@
 // Copyright 2011 Google Inc. All Rights Reserved.
 //
-// This code is licensed under the same terms as WebM:
-//  Software License Agreement:  http://www.webmproject.org/license/software/
-//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Set and delete APIs for mux.
@@ -12,50 +14,51 @@
 
 #include <assert.h>
 #include "./muxi.h"
-
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
+#include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // Life of a mux object.
 
 static void MuxInit(WebPMux* const mux) {
-  if (mux == NULL) return;
+  assert(mux != NULL);
   memset(mux, 0, sizeof(*mux));
+  mux->canvas_width_ = 0;     // just to be explicit
+  mux->canvas_height_ = 0;
 }
 
 WebPMux* WebPNewInternal(int version) {
   if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) {
     return NULL;
   } else {
-    WebPMux* const mux = (WebPMux*)malloc(sizeof(WebPMux));
-    // If mux is NULL MuxInit is a noop.
-    MuxInit(mux);
+    WebPMux* const mux = (WebPMux*)WebPSafeMalloc(1ULL, sizeof(WebPMux));
+    if (mux != NULL) MuxInit(mux);
     return mux;
   }
 }
 
-static void DeleteAllChunks(WebPChunk** const chunk_list) {
-  while (*chunk_list) {
-    *chunk_list = ChunkDelete(*chunk_list);
+// Delete all images in 'wpi_list'.
+static void DeleteAllImages(WebPMuxImage** const wpi_list) {
+  while (*wpi_list != NULL) {
+    *wpi_list = MuxImageDelete(*wpi_list);
   }
 }
 
 static void MuxRelease(WebPMux* const mux) {
-  if (mux == NULL) return;
-  MuxImageDeleteAll(&mux->images_);
-  DeleteAllChunks(&mux->vp8x_);
-  DeleteAllChunks(&mux->iccp_);
-  DeleteAllChunks(&mux->loop_);
-  DeleteAllChunks(&mux->meta_);
-  DeleteAllChunks(&mux->unknown_);
+  assert(mux != NULL);
+  DeleteAllImages(&mux->images_);
+  ChunkListDelete(&mux->vp8x_);
+  ChunkListDelete(&mux->iccp_);
+  ChunkListDelete(&mux->anim_);
+  ChunkListDelete(&mux->exif_);
+  ChunkListDelete(&mux->xmp_);
+  ChunkListDelete(&mux->unknown_);
 }
 
 void WebPMuxDelete(WebPMux* mux) {
-  // If mux is NULL MuxRelease is a noop.
-  MuxRelease(mux);
-  free(mux);
+  if (mux != NULL) {
+    MuxRelease(mux);
+    WebPSafeFree(mux);
+  }
 }
 
 //------------------------------------------------------------------------------
@@ -64,81 +67,60 @@ void WebPMuxDelete(WebPMux* mux) {
 // Handy MACRO, makes MuxSet() very symmetric to MuxGet().
 #define SWITCH_ID_LIST(INDEX, LIST)                                            \
   if (idx == (INDEX)) {                                                        \
-    err = ChunkAssignData(&chunk, data, copy_data, kChunks[(INDEX)].tag);      \
+    err = ChunkAssignData(&chunk, data, copy_data, tag);                       \
     if (err == WEBP_MUX_OK) {                                                  \
       err = ChunkSetNth(&chunk, (LIST), nth);                                  \
     }                                                                          \
     return err;                                                                \
   }
 
-static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
+static WebPMuxError MuxSet(WebPMux* const mux, uint32_t tag, uint32_t nth,
                            const WebPData* const data, int copy_data) {
   WebPChunk chunk;
   WebPMuxError err = WEBP_MUX_NOT_FOUND;
+  const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag);
   assert(mux != NULL);
   assert(!IsWPI(kChunks[idx].id));
 
   ChunkInit(&chunk);
-  SWITCH_ID_LIST(IDX_VP8X, &mux->vp8x_);
-  SWITCH_ID_LIST(IDX_ICCP, &mux->iccp_);
-  SWITCH_ID_LIST(IDX_LOOP, &mux->loop_);
-  SWITCH_ID_LIST(IDX_META, &mux->meta_);
-  if (idx == IDX_UNKNOWN && data->size_ > TAG_SIZE) {
-    // For raw-data unknown chunk, the first four bytes should be the tag to be
-    // used for the chunk.
-    const WebPData tmp = { data->bytes_ + TAG_SIZE, data->size_ - TAG_SIZE };
-    err = ChunkAssignData(&chunk, &tmp, copy_data, GetLE32(data->bytes_ + 0));
-    if (err == WEBP_MUX_OK)
-      err = ChunkSetNth(&chunk, &mux->unknown_, nth);
-  }
+  SWITCH_ID_LIST(IDX_VP8X,    &mux->vp8x_);
+  SWITCH_ID_LIST(IDX_ICCP,    &mux->iccp_);
+  SWITCH_ID_LIST(IDX_ANIM,    &mux->anim_);
+  SWITCH_ID_LIST(IDX_EXIF,    &mux->exif_);
+  SWITCH_ID_LIST(IDX_XMP,     &mux->xmp_);
+  SWITCH_ID_LIST(IDX_UNKNOWN, &mux->unknown_);
   return err;
 }
 #undef SWITCH_ID_LIST
 
-static WebPMuxError MuxAddChunk(WebPMux* const mux, uint32_t nth, uint32_t tag,
-                                const uint8_t* data, size_t size,
-                                int copy_data) {
-  const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag);
-  const WebPData chunk_data = { data, size };
-  assert(mux != NULL);
-  assert(size <= MAX_CHUNK_PAYLOAD);
-  assert(idx != IDX_NIL);
-  return MuxSet(mux, idx, nth, &chunk_data, copy_data);
-}
+// Create data for frame/fragment given image data, offsets and duration.
+static WebPMuxError CreateFrameFragmentData(
+    int width, int height, const WebPMuxFrameInfo* const info, int is_frame,
+    WebPData* const frame_frgm) {
+  uint8_t* frame_frgm_bytes;
+  const size_t frame_frgm_size = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].size;
 
-// Create data for frame/tile given image data, offsets and duration.
-static WebPMuxError CreateFrameTileData(const WebPData* const image,
-                                        int x_offset, int y_offset,
-                                        int duration, int is_lossless,
-                                        int is_frame,
-                                        WebPData* const frame_tile) {
-  int width;
-  int height;
-  uint8_t* frame_tile_bytes;
-  const size_t frame_tile_size = kChunks[is_frame ? IDX_FRAME : IDX_TILE].size;
-
-  const int ok = is_lossless ?
-      VP8LGetInfo(image->bytes_, image->size_, &width, &height, NULL) :
-      VP8GetInfo(image->bytes_, image->size_, image->size_, &width, &height);
-  if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
-
-  assert(width > 0 && height > 0 && duration > 0);
+  assert(width > 0 && height > 0 && info->duration >= 0);
+  assert(info->dispose_method == (info->dispose_method & 1));
   // Note: assertion on upper bounds is done in PutLE24().
 
-  frame_tile_bytes = (uint8_t*)malloc(frame_tile_size);
-  if (frame_tile_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
+  frame_frgm_bytes = (uint8_t*)WebPSafeMalloc(1ULL, frame_frgm_size);
+  if (frame_frgm_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
 
-  PutLE24(frame_tile_bytes + 0, x_offset / 2);
-  PutLE24(frame_tile_bytes + 3, y_offset / 2);
+  PutLE24(frame_frgm_bytes + 0, info->x_offset / 2);
+  PutLE24(frame_frgm_bytes + 3, info->y_offset / 2);
 
   if (is_frame) {
-    PutLE24(frame_tile_bytes + 6, width - 1);
-    PutLE24(frame_tile_bytes + 9, height - 1);
-    PutLE24(frame_tile_bytes + 12, duration - 1);
+    PutLE24(frame_frgm_bytes + 6, width - 1);
+    PutLE24(frame_frgm_bytes + 9, height - 1);
+    PutLE24(frame_frgm_bytes + 12, info->duration);
+    frame_frgm_bytes[15] =
+        (info->blend_method == WEBP_MUX_NO_BLEND ? 2 : 0) |
+        (info->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ? 1 : 0);
   }
 
-  frame_tile->bytes_ = frame_tile_bytes;
-  frame_tile->size_ = frame_tile_size;
+  frame_frgm->bytes = frame_frgm_bytes;
+  frame_frgm->size = frame_frgm_size;
   return WEBP_MUX_OK;
 }
 
@@ -149,8 +131,8 @@ static WebPMuxError GetImageData(const WebPData* const bitstream,
                                  WebPData* const image, WebPData* const alpha,
                                  int* const is_lossless) {
   WebPDataInit(alpha);  // Default: no alpha.
-  if (bitstream->size_ < TAG_SIZE ||
-      memcmp(bitstream->bytes_, "RIFF", TAG_SIZE)) {
+  if (bitstream->size < TAG_SIZE ||
+      memcmp(bitstream->bytes, "RIFF", TAG_SIZE)) {
     // It is NOT webp file data. Return input data as is.
     *image = *bitstream;
   } else {
@@ -166,7 +148,7 @@ static WebPMuxError GetImageData(const WebPData* const bitstream,
     }
     WebPMuxDelete(mux);
   }
-  *is_lossless = VP8LCheckSignature(image->bytes_, image->size_);
+  *is_lossless = VP8LCheckSignature(image->bytes, image->size);
   return WEBP_MUX_OK;
 }
 
@@ -185,204 +167,166 @@ static WebPMuxError DeleteChunks(WebPChunk** chunk_list, uint32_t tag) {
   return err;
 }
 
-static WebPMuxError MuxDeleteAllNamedData(WebPMux* const mux, CHUNK_INDEX idx) {
-  const WebPChunkId id = kChunks[idx].id;
-  WebPChunk** chunk_list;
-
-  if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+static WebPMuxError MuxDeleteAllNamedData(WebPMux* const mux, uint32_t tag) {
+  const WebPChunkId id = ChunkGetIdFromTag(tag);
+  assert(mux != NULL);
   if (IsWPI(id)) return WEBP_MUX_INVALID_ARGUMENT;
-
-  chunk_list = MuxGetChunkListFromId(mux, id);
-  if (chunk_list == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-
-  return DeleteChunks(chunk_list, kChunks[idx].tag);
-}
-
-static WebPMuxError DeleteLoopCount(WebPMux* const mux) {
-  return MuxDeleteAllNamedData(mux, IDX_LOOP);
+  return DeleteChunks(MuxGetChunkListFromId(mux, id), tag);
 }
 
 //------------------------------------------------------------------------------
 // Set API(s).
 
-WebPMuxError WebPMuxSetImage(WebPMux* mux,
-                             const WebPData* bitstream, int copy_data) {
+WebPMuxError WebPMuxSetChunk(WebPMux* mux, const char fourcc[4],
+                             const WebPData* chunk_data, int copy_data) {
+  uint32_t tag;
   WebPMuxError err;
-  WebPChunk chunk;
-  WebPMuxImage wpi;
-  WebPData image;
-  WebPData alpha;
-  int is_lossless;
-  int image_tag;
-
-  if (mux == NULL || bitstream == NULL || bitstream->bytes_ == NULL ||
-      bitstream->size_ > MAX_CHUNK_PAYLOAD) {
+  if (mux == NULL || fourcc == NULL || chunk_data == NULL ||
+      chunk_data->bytes == NULL || chunk_data->size > MAX_CHUNK_PAYLOAD) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
+  tag = ChunkGetTagFromFourCC(fourcc);
 
-  // If given data is for a whole webp file,
-  // extract only the VP8/VP8L data from it.
-  err = GetImageData(bitstream, &image, &alpha, &is_lossless);
-  if (err != WEBP_MUX_OK) return err;
-  image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
-
-  // Delete the existing images.
-  MuxImageDeleteAll(&mux->images_);
-
-  MuxImageInit(&wpi);
+  // Delete existing chunk(s) with the same 'fourcc'.
+  err = MuxDeleteAllNamedData(mux, tag);
+  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
 
-  if (alpha.bytes_ != NULL) {  // Add alpha chunk.
-    ChunkInit(&chunk);
-    err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
-    if (err != WEBP_MUX_OK) goto Err;
-    err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
-    if (err != WEBP_MUX_OK) goto Err;
-  }
+  // Add the given chunk.
+  return MuxSet(mux, tag, 1, chunk_data, copy_data);
+}
 
-  // Add image chunk.
+// Creates a chunk from given 'data' and sets it as 1st chunk in 'chunk_list'.
+static WebPMuxError AddDataToChunkList(
+    const WebPData* const data, int copy_data, uint32_t tag,
+    WebPChunk** chunk_list) {
+  WebPChunk chunk;
+  WebPMuxError err;
   ChunkInit(&chunk);
-  err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
+  err = ChunkAssignData(&chunk, data, copy_data, tag);
   if (err != WEBP_MUX_OK) goto Err;
-  err = ChunkSetNth(&chunk, &wpi.img_, 1);
-  if (err != WEBP_MUX_OK) goto Err;
-
-  // Add this image to mux.
-  err = MuxImagePush(&wpi, &mux->images_);
+  err = ChunkSetNth(&chunk, chunk_list, 1);
   if (err != WEBP_MUX_OK) goto Err;
-
-  // All OK.
   return WEBP_MUX_OK;
-
  Err:
-  // Something bad happened.
   ChunkRelease(&chunk);
-  MuxImageRelease(&wpi);
   return err;
 }
 
-WebPMuxError WebPMuxSetMetadata(WebPMux* mux, const WebPData* metadata,
-                                int copy_data) {
-  WebPMuxError err;
-
-  if (mux == NULL || metadata == NULL || metadata->bytes_ == NULL ||
-      metadata->size_ > MAX_CHUNK_PAYLOAD) {
-    return WEBP_MUX_INVALID_ARGUMENT;
+// Extracts image & alpha data from the given bitstream and then sets wpi.alpha_
+// and wpi.img_ appropriately.
+static WebPMuxError SetAlphaAndImageChunks(
+    const WebPData* const bitstream, int copy_data, WebPMuxImage* const wpi) {
+  int is_lossless = 0;
+  WebPData image, alpha;
+  WebPMuxError err = GetImageData(bitstream, &image, &alpha, &is_lossless);
+  const int image_tag =
+      is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
+  if (err != WEBP_MUX_OK) return err;
+  if (alpha.bytes != NULL) {
+    err = AddDataToChunkList(&alpha, copy_data, kChunks[IDX_ALPHA].tag,
+                             &wpi->alpha_);
+    if (err != WEBP_MUX_OK) return err;
   }
-
-  // Delete the existing metadata chunk(s).
-  err = WebPMuxDeleteMetadata(mux);
-  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
-
-  // Add the given metadata chunk.
-  return MuxSet(mux, IDX_META, 1, metadata, copy_data);
+  err = AddDataToChunkList(&image, copy_data, image_tag, &wpi->img_);
+  if (err != WEBP_MUX_OK) return err;
+  return MuxImageFinalize(wpi) ? WEBP_MUX_OK : WEBP_MUX_INVALID_ARGUMENT;
 }
 
-WebPMuxError WebPMuxSetColorProfile(WebPMux* mux, const WebPData* color_profile,
-                                    int copy_data) {
+WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream,
+                             int copy_data) {
+  WebPMuxImage wpi;
   WebPMuxError err;
 
-  if (mux == NULL || color_profile == NULL || color_profile->bytes_ == NULL ||
-      color_profile->size_ > MAX_CHUNK_PAYLOAD) {
+  // Sanity checks.
+  if (mux == NULL || bitstream == NULL || bitstream->bytes == NULL ||
+      bitstream->size > MAX_CHUNK_PAYLOAD) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
-  // Delete the existing ICCP chunk(s).
-  err = WebPMuxDeleteColorProfile(mux);
-  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
-
-  // Add the given ICCP chunk.
-  return MuxSet(mux, IDX_ICCP, 1, color_profile, copy_data);
-}
-
-WebPMuxError WebPMuxSetLoopCount(WebPMux* mux, int loop_count) {
-  WebPMuxError err;
-  uint8_t* data = NULL;
+  if (mux->images_ != NULL) {
+    // Only one 'simple image' can be added in mux. So, remove present images.
+    DeleteAllImages(&mux->images_);
+  }
 
-  if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-  if (loop_count >= MAX_LOOP_COUNT) return WEBP_MUX_INVALID_ARGUMENT;
+  MuxImageInit(&wpi);
+  err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi);
+  if (err != WEBP_MUX_OK) goto Err;
 
-  // Delete the existing LOOP chunk(s).
-  err = DeleteLoopCount(mux);
-  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
+  // Add this WebPMuxImage to mux.
+  err = MuxImagePush(&wpi, &mux->images_);
+  if (err != WEBP_MUX_OK) goto Err;
 
-  // Add the given loop count.
-  data = (uint8_t*)malloc(kChunks[IDX_LOOP].size);
-  if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
+  // All is well.
+  return WEBP_MUX_OK;
 
-  PutLE16(data, loop_count);
-  err = MuxAddChunk(mux, 1, kChunks[IDX_LOOP].tag, data,
-                    kChunks[IDX_LOOP].size, 1);
-  free(data);
+ Err:  // Something bad happened.
+  MuxImageRelease(&wpi);
   return err;
 }
 
-static WebPMuxError MuxPushFrameTileInternal(
-    WebPMux* const mux, const WebPData* const bitstream, int x_offset,
-    int y_offset, int duration, int copy_data, uint32_t tag) {
-  WebPChunk chunk;
-  WebPData image;
-  WebPData alpha;
+WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame,
+                              int copy_data) {
   WebPMuxImage wpi;
   WebPMuxError err;
-  WebPData frame_tile;
-  const int is_frame = (tag == kChunks[IDX_FRAME].tag) ? 1 : 0;
-  int is_lossless;
-  int image_tag;
+  int is_frame;
+  const WebPData* const bitstream = &frame->bitstream;
 
   // Sanity checks.
-  if (mux == NULL || bitstream == NULL || bitstream->bytes_ == NULL ||
-      bitstream->size_ > MAX_CHUNK_PAYLOAD) {
+  if (mux == NULL || frame == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+
+  is_frame = (frame->id == WEBP_CHUNK_ANMF);
+  if (!(is_frame || (frame->id == WEBP_CHUNK_FRGM))) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
-  if (x_offset < 0 || x_offset >= MAX_POSITION_OFFSET ||
-      y_offset < 0 || y_offset >= MAX_POSITION_OFFSET ||
-      duration <= 0 || duration > MAX_DURATION) {
+  if (frame->id == WEBP_CHUNK_FRGM) {     // Dead experiment.
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
-  // Snap offsets to even positions.
-  x_offset &= ~1;
-  y_offset &= ~1;
+  if (bitstream->bytes == NULL || bitstream->size > MAX_CHUNK_PAYLOAD) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
 
-  // If given data is for a whole webp file,
-  // extract only the VP8/VP8L data from it.
-  err = GetImageData(bitstream, &image, &alpha, &is_lossless);
-  if (err != WEBP_MUX_OK) return err;
-  image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
+  if (mux->images_ != NULL) {
+    const WebPMuxImage* const image = mux->images_;
+    const uint32_t image_id = (image->header_ != NULL) ?
+        ChunkGetIdFromTag(image->header_->tag_) : WEBP_CHUNK_IMAGE;
+    if (image_id != frame->id) {
+      return WEBP_MUX_INVALID_ARGUMENT;  // Conflicting frame types.
+    }
+  }
 
-  WebPDataInit(&frame_tile);
-  ChunkInit(&chunk);
   MuxImageInit(&wpi);
-
-  if (alpha.bytes_ != NULL) {
-    // Add alpha chunk.
-    err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
+  err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi);
+  if (err != WEBP_MUX_OK) goto Err;
+  assert(wpi.img_ != NULL);  // As SetAlphaAndImageChunks() was successful.
+
+  {
+    WebPData frame_frgm;
+    const uint32_t tag = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].tag;
+    WebPMuxFrameInfo tmp = *frame;
+    tmp.x_offset &= ~1;  // Snap offsets to even.
+    tmp.y_offset &= ~1;
+    if (!is_frame) {  // Reset unused values.
+      tmp.duration = 1;
+      tmp.dispose_method = WEBP_MUX_DISPOSE_NONE;
+      tmp.blend_method = WEBP_MUX_BLEND;
+    }
+    if (tmp.x_offset < 0 || tmp.x_offset >= MAX_POSITION_OFFSET ||
+        tmp.y_offset < 0 || tmp.y_offset >= MAX_POSITION_OFFSET ||
+        (tmp.duration < 0 || tmp.duration >= MAX_DURATION) ||
+        tmp.dispose_method != (tmp.dispose_method & 1)) {
+      err = WEBP_MUX_INVALID_ARGUMENT;
+      goto Err;
+    }
+    err = CreateFrameFragmentData(wpi.width_, wpi.height_, &tmp, is_frame,
+                                  &frame_frgm);
     if (err != WEBP_MUX_OK) goto Err;
-    err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
+    // Add frame/fragment chunk (with copy_data = 1).
+    err = AddDataToChunkList(&frame_frgm, 1, tag, &wpi.header_);
+    WebPDataClear(&frame_frgm);  // frame_frgm owned by wpi.header_ now.
     if (err != WEBP_MUX_OK) goto Err;
-    ChunkInit(&chunk);  // chunk owned by wpi.alpha_ now.
   }
 
-  // Add image chunk.
-  err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
-  if (err != WEBP_MUX_OK) goto Err;
-  err = ChunkSetNth(&chunk, &wpi.img_, 1);
-  if (err != WEBP_MUX_OK) goto Err;
-  ChunkInit(&chunk);  // chunk owned by wpi.img_ now.
-
-  // Create frame/tile data.
-  err = CreateFrameTileData(&image, x_offset, y_offset, duration, is_lossless,
-                            is_frame, &frame_tile);
-  if (err != WEBP_MUX_OK) goto Err;
-
-  // Add frame/tile chunk (with copy_data = 1).
-  err = ChunkAssignData(&chunk, &frame_tile, 1, tag);
-  if (err != WEBP_MUX_OK) goto Err;
-  WebPDataClear(&frame_tile);
-  err = ChunkSetNth(&chunk, &wpi.header_, 1);
-  if (err != WEBP_MUX_OK) goto Err;
-  ChunkInit(&chunk);  // chunk owned by wpi.header_ now.
-
   // Add this WebPMuxImage to mux.
   err = MuxImagePush(&wpi, &mux->images_);
   if (err != WEBP_MUX_OK) goto Err;
@@ -391,128 +335,114 @@ static WebPMuxError MuxPushFrameTileInternal(
   return WEBP_MUX_OK;
 
  Err:  // Something bad happened.
-  WebPDataClear(&frame_tile);
-  ChunkRelease(&chunk);
   MuxImageRelease(&wpi);
   return err;
 }
 
-WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPData* bitstream,
-                              int x_offset, int y_offset,
-                              int duration, int copy_data) {
-  return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
-                                  duration, copy_data, kChunks[IDX_FRAME].tag);
-}
-
-WebPMuxError WebPMuxPushTile(WebPMux* mux, const WebPData* bitstream,
-                             int x_offset, int y_offset,
-                             int copy_data) {
-  return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
-                                  1 /* unused duration */, copy_data,
-                                  kChunks[IDX_TILE].tag);
-}
-
-//------------------------------------------------------------------------------
-// Delete API(s).
-
-WebPMuxError WebPMuxDeleteImage(WebPMux* mux) {
+WebPMuxError WebPMuxSetAnimationParams(WebPMux* mux,
+                                       const WebPMuxAnimParams* params) {
   WebPMuxError err;
+  uint8_t data[ANIM_CHUNK_SIZE];
+  const WebPData anim = { data, ANIM_CHUNK_SIZE };
 
-  if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+  if (mux == NULL || params == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+  if (params->loop_count < 0 || params->loop_count >= MAX_LOOP_COUNT) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
 
-  err = MuxValidateForImage(mux);
-  if (err != WEBP_MUX_OK) return err;
+  // Delete any existing ANIM chunk(s).
+  err = MuxDeleteAllNamedData(mux, kChunks[IDX_ANIM].tag);
+  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
 
-  // All well, delete image.
-  MuxImageDeleteAll(&mux->images_);
-  return WEBP_MUX_OK;
+  // Set the animation parameters.
+  PutLE32(data, params->bgcolor);
+  PutLE16(data + 4, params->loop_count);
+  return MuxSet(mux, kChunks[IDX_ANIM].tag, 1, &anim, 1);
 }
 
-WebPMuxError WebPMuxDeleteMetadata(WebPMux* mux) {
-  return MuxDeleteAllNamedData(mux, IDX_META);
-}
+WebPMuxError WebPMuxSetCanvasSize(WebPMux* mux,
+                                  int width, int height) {
+  WebPMuxError err;
+  if (mux == NULL) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+  if (width < 0 || height < 0 ||
+      width > MAX_CANVAS_SIZE || height > MAX_CANVAS_SIZE) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+  if (width * (uint64_t)height >= MAX_IMAGE_AREA) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+  if ((width * height) == 0 && (width | height) != 0) {
+    // one of width / height is zero, but not both -> invalid!
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+  // If we already assembled a VP8X chunk, invalidate it.
+  err = MuxDeleteAllNamedData(mux, kChunks[IDX_VP8X].tag);
+  if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
 
-WebPMuxError WebPMuxDeleteColorProfile(WebPMux* mux) {
-  return MuxDeleteAllNamedData(mux, IDX_ICCP);
+  mux->canvas_width_ = width;
+  mux->canvas_height_ = height;
+  return WEBP_MUX_OK;
 }
 
-static WebPMuxError DeleteFrameTileInternal(WebPMux* const mux, uint32_t nth,
-                                            CHUNK_INDEX idx) {
-  const WebPChunkId id = kChunks[idx].id;
-  if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+//------------------------------------------------------------------------------
+// Delete API(s).
 
-  assert(idx == IDX_FRAME || idx == IDX_TILE);
-  return MuxImageDeleteNth(&mux->images_, nth, id);
+WebPMuxError WebPMuxDeleteChunk(WebPMux* mux, const char fourcc[4]) {
+  if (mux == NULL || fourcc == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+  return MuxDeleteAllNamedData(mux, ChunkGetTagFromFourCC(fourcc));
 }
 
 WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth) {
-  return DeleteFrameTileInternal(mux, nth, IDX_FRAME);
-}
-
-WebPMuxError WebPMuxDeleteTile(WebPMux* mux, uint32_t nth) {
-  return DeleteFrameTileInternal(mux, nth, IDX_TILE);
+  if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+  return MuxImageDeleteNth(&mux->images_, nth);
 }
 
 //------------------------------------------------------------------------------
 // Assembly of the WebP RIFF file.
 
-static WebPMuxError GetFrameTileInfo(const WebPChunk* const frame_tile_chunk,
-                                     int* const x_offset, int* const y_offset,
-                                     int* const duration) {
-  const uint32_t tag = frame_tile_chunk->tag_;
-  const int is_frame = (tag == kChunks[IDX_FRAME].tag);
-  const WebPData* const data = &frame_tile_chunk->data_;
+static WebPMuxError GetFrameFragmentInfo(
+    const WebPChunk* const frame_frgm_chunk,
+    int* const x_offset, int* const y_offset, int* const duration) {
+  const uint32_t tag = frame_frgm_chunk->tag_;
+  const int is_frame = (tag == kChunks[IDX_ANMF].tag);
+  const WebPData* const data = &frame_frgm_chunk->data_;
   const size_t expected_data_size =
-      is_frame ? FRAME_CHUNK_SIZE : TILE_CHUNK_SIZE;
-  assert(frame_tile_chunk != NULL);
-  assert(tag == kChunks[IDX_FRAME].tag || tag ==  kChunks[IDX_TILE].tag);
-  if (data->size_ != expected_data_size) return WEBP_MUX_INVALID_ARGUMENT;
-
-  *x_offset = 2 * GetLE24(data->bytes_ + 0);
-  *y_offset = 2 * GetLE24(data->bytes_ + 3);
-  if (is_frame) *duration = 1 + GetLE24(data->bytes_ + 12);
+      is_frame ? ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE;
+  assert(frame_frgm_chunk != NULL);
+  assert(tag == kChunks[IDX_ANMF].tag || tag ==  kChunks[IDX_FRGM].tag);
+  if (data->size != expected_data_size) return WEBP_MUX_INVALID_ARGUMENT;
+
+  *x_offset = 2 * GetLE24(data->bytes + 0);
+  *y_offset = 2 * GetLE24(data->bytes + 3);
+  if (is_frame) *duration = GetLE24(data->bytes + 12);
   return WEBP_MUX_OK;
 }
 
-WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
-                                    int* const width, int* const height) {
-  const uint32_t tag = image_chunk->tag_;
-  const WebPData* const data = &image_chunk->data_;
-  int w, h;
-  int ok;
-  assert(image_chunk != NULL);
-  assert(tag == kChunks[IDX_VP8].tag || tag ==  kChunks[IDX_VP8L].tag);
-  ok = (tag == kChunks[IDX_VP8].tag) ?
-      VP8GetInfo(data->bytes_, data->size_, data->size_, &w, &h) :
-      VP8LGetInfo(data->bytes_, data->size_, &w, &h, NULL);
-  if (ok) {
-    *width = w;
-    *height = h;
-    return WEBP_MUX_OK;
-  } else {
-    return WEBP_MUX_BAD_DATA;
-  }
-}
-
 static WebPMuxError GetImageInfo(const WebPMuxImage* const wpi,
                                  int* const x_offset, int* const y_offset,
                                  int* const duration,
                                  int* const width, int* const height) {
-  const WebPChunk* const image_chunk = wpi->img_;
-  const WebPChunk* const frame_tile_chunk = wpi->header_;
+  const WebPChunk* const frame_frgm_chunk = wpi->header_;
+  WebPMuxError err;
+  assert(wpi != NULL);
+  assert(frame_frgm_chunk != NULL);
 
-  // Get offsets and duration from FRM/TILE chunk.
-  const WebPMuxError err =
-      GetFrameTileInfo(frame_tile_chunk, x_offset, y_offset, duration);
+  // Get offsets and duration from ANMF/FRGM chunk.
+  err = GetFrameFragmentInfo(frame_frgm_chunk, x_offset, y_offset, duration);
   if (err != WEBP_MUX_OK) return err;
 
   // Get width and height from VP8/VP8L chunk.
-  return MuxGetImageWidthHeight(image_chunk, width, height);
+  if (width != NULL) *width = wpi->width_;
+  if (height != NULL) *height = wpi->height_;
+  return WEBP_MUX_OK;
 }
 
-static WebPMuxError GetImageCanvasWidthHeight(
-    const WebPMux* const mux, uint32_t flags,
-    int* const width, int* const height) {
+// Returns the tightest dimension for the canvas considering the image list.
+static WebPMuxError GetAdjustedCanvasSize(const WebPMux* const mux,
+                                          uint32_t flags,
+                                          int* const width, int* const height) {
   WebPMuxImage* wpi = NULL;
   assert(mux != NULL);
   assert(width != NULL && height != NULL);
@@ -521,13 +451,15 @@ static WebPMuxError GetImageCanvasWidthHeight(
   assert(wpi != NULL);
   assert(wpi->img_ != NULL);
 
-  if (wpi->next_) {
+  if (wpi->next_ != NULL) {
     int max_x = 0;
     int max_y = 0;
     int64_t image_area = 0;
-    // Aggregate the bounding box for animation frames & tiled images.
+    // if we have a chain of wpi's, header_ is necessarily set
+    assert(wpi->header_ != NULL);
+    // Aggregate the bounding box for animation frames & fragmented images.
     for (; wpi != NULL; wpi = wpi->next_) {
-      int x_offset, y_offset, duration, w, h;
+      int x_offset = 0, y_offset = 0, duration = 0, w = 0, h = 0;
       const WebPMuxError err = GetImageInfo(wpi, &x_offset, &y_offset,
                                             &duration, &w, &h);
       const int max_x_pos = x_offset + w;
@@ -542,23 +474,19 @@ static WebPMuxError GetImageCanvasWidthHeight(
     }
     *width = max_x;
     *height = max_y;
-    // Crude check to validate that there are no image overlaps/holes for tile
-    // images. Check that the aggregated image area for individual tiles exactly
-    // matches the image area of the constructed canvas. However, the area-match
-    // is necessary but not sufficient condition.
-    if ((flags & TILE_FLAG) && (image_area != (max_x * max_y))) {
+    // Crude check to validate that there are no image overlaps/holes for
+    // fragmented images. Check that the aggregated image area for individual
+    // fragments exactly matches the image area of the constructed canvas.
+    // However, the area-match is necessary but not sufficient condition.
+    if ((flags & FRAGMENTS_FLAG) && (image_area != (max_x * max_y))) {
       *width = 0;
       *height = 0;
       return WEBP_MUX_INVALID_ARGUMENT;
     }
   } else {
-    // For a single image, extract the width & height from VP8/VP8L image-data.
-    int w, h;
-    const WebPChunk* const image_chunk = wpi->img_;
-    const WebPMuxError err = MuxGetImageWidthHeight(image_chunk, &w, &h);
-    if (err != WEBP_MUX_OK) return err;
-    *width = w;
-    *height = h;
+    // For a single image, canvas dimensions are same as image dimensions.
+    *width = wpi->width_;
+    *height = wpi->height_;
   }
   return WEBP_MUX_OK;
 }
@@ -574,50 +502,45 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
   int width = 0;
   int height = 0;
   uint8_t data[VP8X_CHUNK_SIZE];
-  const size_t data_size = VP8X_CHUNK_SIZE;
+  const WebPData vp8x = { data, VP8X_CHUNK_SIZE };
   const WebPMuxImage* images = NULL;
 
   assert(mux != NULL);
   images = mux->images_;  // First image.
   if (images == NULL || images->img_ == NULL ||
-      images->img_->data_.bytes_ == NULL) {
+      images->img_->data_.bytes == NULL) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
   // If VP8X chunk(s) is(are) already present, remove them (and later add new
   // VP8X chunk with updated flags).
-  err = MuxDeleteAllNamedData(mux, IDX_VP8X);
+  err = MuxDeleteAllNamedData(mux, kChunks[IDX_VP8X].tag);
   if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
 
   // Set flags.
-  if (mux->iccp_ != NULL && mux->iccp_->data_.bytes_ != NULL) {
+  if (mux->iccp_ != NULL && mux->iccp_->data_.bytes != NULL) {
     flags |= ICCP_FLAG;
   }
-
-  if (mux->meta_ != NULL && mux->meta_->data_.bytes_ != NULL) {
-    flags |= META_FLAG;
+  if (mux->exif_ != NULL && mux->exif_->data_.bytes != NULL) {
+    flags |= EXIF_FLAG;
+  }
+  if (mux->xmp_ != NULL && mux->xmp_->data_.bytes != NULL) {
+    flags |= XMP_FLAG;
   }
-
   if (images->header_ != NULL) {
-    if (images->header_->tag_ == kChunks[IDX_TILE].tag) {
-      // This is a tiled image.
-      flags |= TILE_FLAG;
-    } else if (images->header_->tag_ == kChunks[IDX_FRAME].tag) {
+    if (images->header_->tag_ == kChunks[IDX_FRGM].tag) {
+      // This is a fragmented image.
+      flags |= FRAGMENTS_FLAG;
+    } else if (images->header_->tag_ == kChunks[IDX_ANMF].tag) {
       // This is an image with animation.
       flags |= ANIMATION_FLAG;
     }
   }
-
   if (MuxImageCount(images, WEBP_CHUNK_ALPHA) > 0) {
     flags |= ALPHA_FLAG;  // Some images have an alpha channel.
   }
 
-  if (flags == 0) {
-    // For Simple Image, VP8X chunk should not be added.
-    return WEBP_MUX_OK;
-  }
-
-  err = GetImageCanvasWidthHeight(mux, flags, &width, &height);
+  err = GetAdjustedCanvasSize(mux, flags, &width, &height);
   if (err != WEBP_MUX_OK) return err;
 
   if (width <= 0 || height <= 0) {
@@ -627,9 +550,21 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
-  if (MuxHasLosslessImages(images)) {
-    // We have a file with a VP8X chunk having some lossless images.
-    // As lossless images implicitly contain alpha, force ALPHA_FLAG to be true.
+  if (mux->canvas_width_ != 0 || mux->canvas_height_ != 0) {
+    if (width > mux->canvas_width_ || height > mux->canvas_height_) {
+      return WEBP_MUX_INVALID_ARGUMENT;
+    }
+    width = mux->canvas_width_;
+    height = mux->canvas_height_;
+  }
+
+  if (flags == 0) {
+    // For Simple Image, VP8X chunk should not be added.
+    return WEBP_MUX_OK;
+  }
+
+  if (MuxHasAlpha(images)) {
+    // This means some frames explicitly/implicitly contain alpha.
     // Note: This 'flags' update must NOT be done for a lossless image
     // without a VP8X chunk!
     flags |= ALPHA_FLAG;
@@ -639,74 +574,123 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
   PutLE24(data + 4, width - 1);   // canvas width.
   PutLE24(data + 7, height - 1);  // canvas height.
 
-  err = MuxAddChunk(mux, 1, kChunks[IDX_VP8X].tag, data, data_size, 1);
-  return err;
+  return MuxSet(mux, kChunks[IDX_VP8X].tag, 1, &vp8x, 1);
+}
+
+// Cleans up 'mux' by removing any unnecessary chunks.
+static WebPMuxError MuxCleanup(WebPMux* const mux) {
+  int num_frames;
+  int num_fragments;
+  int num_anim_chunks;
+
+  // If we have an image with a single fragment or frame, and its rectangle
+  // covers the whole canvas, convert it to a non-animated non-fragmented image
+  // (to avoid writing FRGM/ANMF chunk unnecessarily).
+  WebPMuxError err = WebPMuxNumChunks(mux, kChunks[IDX_ANMF].id, &num_frames);
+  if (err != WEBP_MUX_OK) return err;
+  err = WebPMuxNumChunks(mux, kChunks[IDX_FRGM].id, &num_fragments);
+  if (err != WEBP_MUX_OK) return err;
+  if (num_frames == 1 || num_fragments == 1) {
+    WebPMuxImage* frame_frag;
+    err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, &frame_frag);
+    assert(err == WEBP_MUX_OK);  // We know that one frame/fragment does exist.
+    assert(frame_frag != NULL);
+    if (frame_frag->header_ != NULL &&
+        ((mux->canvas_width_ == 0 && mux->canvas_height_ == 0) ||
+         (frame_frag->width_ == mux->canvas_width_ &&
+          frame_frag->height_ == mux->canvas_height_))) {
+      assert(frame_frag->header_->tag_ == kChunks[IDX_ANMF].tag ||
+             frame_frag->header_->tag_ == kChunks[IDX_FRGM].tag);
+      ChunkDelete(frame_frag->header_);  // Removes ANMF/FRGM chunk.
+      frame_frag->header_ = NULL;
+      num_frames = 0;
+      num_fragments = 0;
+    }
+  }
+  // Remove ANIM chunk if this is a non-animated image.
+  err = WebPMuxNumChunks(mux, kChunks[IDX_ANIM].id, &num_anim_chunks);
+  if (err != WEBP_MUX_OK) return err;
+  if (num_anim_chunks >= 1 && num_frames == 0) {
+    err = MuxDeleteAllNamedData(mux, kChunks[IDX_ANIM].tag);
+    if (err != WEBP_MUX_OK) return err;
+  }
+  return WEBP_MUX_OK;
+}
+
+// Total size of a list of images.
+static size_t ImageListDiskSize(const WebPMuxImage* wpi_list) {
+  size_t size = 0;
+  while (wpi_list != NULL) {
+    size += MuxImageDiskSize(wpi_list);
+    wpi_list = wpi_list->next_;
+  }
+  return size;
+}
+
+// Write out the given list of images into 'dst'.
+static uint8_t* ImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst) {
+  while (wpi_list != NULL) {
+    dst = MuxImageEmit(wpi_list, dst);
+    wpi_list = wpi_list->next_;
+  }
+  return dst;
 }
 
 WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
   size_t size = 0;
   uint8_t* data = NULL;
   uint8_t* dst = NULL;
-  int num_frames;
-  int num_loop_chunks;
   WebPMuxError err;
 
-  if (mux == NULL || assembled_data == NULL) {
+  if (assembled_data == NULL) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
+  // Clean up returned data, in case something goes wrong.
+  memset(assembled_data, 0, sizeof(*assembled_data));
 
-  // Remove LOOP chunk if unnecessary.
-  err = WebPMuxNumChunks(mux, kChunks[IDX_LOOP].id, &num_loop_chunks);
-  if (err != WEBP_MUX_OK) return err;
-  if (num_loop_chunks >= 1) {
-    err = WebPMuxNumChunks(mux, kChunks[IDX_FRAME].id, &num_frames);
-    if (err != WEBP_MUX_OK) return err;
-    if (num_frames == 0) {
-      err = DeleteLoopCount(mux);
-      if (err != WEBP_MUX_OK) return err;
-    }
+  if (mux == NULL) {
+    return WEBP_MUX_INVALID_ARGUMENT;
   }
 
-  // Create VP8X chunk.
+  // Finalize mux.
+  err = MuxCleanup(mux);
+  if (err != WEBP_MUX_OK) return err;
   err = CreateVP8XChunk(mux);
   if (err != WEBP_MUX_OK) return err;
 
   // Allocate data.
-  size = ChunksListDiskSize(mux->vp8x_) + ChunksListDiskSize(mux->iccp_)
-       + ChunksListDiskSize(mux->loop_) + MuxImageListDiskSize(mux->images_)
-       + ChunksListDiskSize(mux->meta_) + ChunksListDiskSize(mux->unknown_)
-       + RIFF_HEADER_SIZE;
+  size = ChunkListDiskSize(mux->vp8x_) + ChunkListDiskSize(mux->iccp_)
+       + ChunkListDiskSize(mux->anim_) + ImageListDiskSize(mux->images_)
+       + ChunkListDiskSize(mux->exif_) + ChunkListDiskSize(mux->xmp_)
+       + ChunkListDiskSize(mux->unknown_) + RIFF_HEADER_SIZE;
 
-  data = (uint8_t*)malloc(size);
+  data = (uint8_t*)WebPSafeMalloc(1ULL, size);
   if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
 
   // Emit header & chunks.
   dst = MuxEmitRiffHeader(data, size);
   dst = ChunkListEmit(mux->vp8x_, dst);
   dst = ChunkListEmit(mux->iccp_, dst);
-  dst = ChunkListEmit(mux->loop_, dst);
-  dst = MuxImageListEmit(mux->images_, dst);
-  dst = ChunkListEmit(mux->meta_, dst);
+  dst = ChunkListEmit(mux->anim_, dst);
+  dst = ImageListEmit(mux->images_, dst);
+  dst = ChunkListEmit(mux->exif_, dst);
+  dst = ChunkListEmit(mux->xmp_, dst);
   dst = ChunkListEmit(mux->unknown_, dst);
   assert(dst == data + size);
 
   // Validate mux.
   err = MuxValidate(mux);
   if (err != WEBP_MUX_OK) {
-    free(data);
+    WebPSafeFree(data);
     data = NULL;
     size = 0;
   }
 
-  // Finalize.
-  assembled_data->bytes_ = data;
-  assembled_data->size_ = size;
+  // Finalize data.
+  assembled_data->bytes = data;
+  assembled_data->size = size;
 
   return err;
 }
 
 //------------------------------------------------------------------------------
-
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif
diff --git a/drivers/webp/mux/muxi.h b/drivers/webp/mux/muxi.h
index 2f06f3ed03..718b2f5d58 100644
--- a/drivers/webp/mux/muxi.h
+++ b/drivers/webp/mux/muxi.h
@@ -1,8 +1,10 @@
 // Copyright 2011 Google Inc. All Rights Reserved.
 //
-// This code is licensed under the same terms as WebM:
-//  Software License Agreement:  http://www.webmproject.org/license/software/
-//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Internal header for mux library.
@@ -15,34 +17,41 @@
 #include <stdlib.h>
 #include "../dec/vp8i.h"
 #include "../dec/vp8li.h"
-#include "../format_constants.h"
-#include "../mux.h"
+#include "../webp/mux.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
+#ifdef __cplusplus
 extern "C" {
 #endif
 
 //------------------------------------------------------------------------------
 // Defines and constants.
 
+#define MUX_MAJ_VERSION 0
+#define MUX_MIN_VERSION 2
+#define MUX_REV_VERSION 2
+
 // Chunk object.
 typedef struct WebPChunk WebPChunk;
 struct WebPChunk {
   uint32_t        tag_;
   int             owner_;  // True if *data_ memory is owned internally.
-                           // VP8X, Loop, and other internally created chunks
-                           // like frame/tile are always owned.
+                           // VP8X, ANIM, and other internally created chunks
+                           // like ANMF/FRGM are always owned.
   WebPData        data_;
   WebPChunk*      next_;
 };
 
-// MuxImage object. Store a full webp image (including frame/tile chunk, alpha
+// MuxImage object. Store a full WebP image (including ANMF/FRGM chunk, ALPH
 // chunk and VP8/VP8L chunk),
 typedef struct WebPMuxImage WebPMuxImage;
 struct WebPMuxImage {
-  WebPChunk*  header_;      // Corresponds to WEBP_CHUNK_FRAME/WEBP_CHUNK_TILE.
+  WebPChunk*  header_;      // Corresponds to WEBP_CHUNK_ANMF/WEBP_CHUNK_FRGM.
   WebPChunk*  alpha_;       // Corresponds to WEBP_CHUNK_ALPHA.
   WebPChunk*  img_;         // Corresponds to WEBP_CHUNK_IMAGE.
+  WebPChunk*  unknown_;     // Corresponds to WEBP_CHUNK_UNKNOWN.
+  int         width_;
+  int         height_;
+  int         has_alpha_;   // Through ALPH chunk or as part of VP8L.
   int         is_partial_;  // True if only some of the chunks are filled.
   WebPMuxImage* next_;
 };
@@ -51,11 +60,14 @@ struct WebPMuxImage {
 struct WebPMux {
   WebPMuxImage*   images_;
   WebPChunk*      iccp_;
-  WebPChunk*      meta_;
-  WebPChunk*      loop_;
+  WebPChunk*      exif_;
+  WebPChunk*      xmp_;
+  WebPChunk*      anim_;
   WebPChunk*      vp8x_;
 
-  WebPChunk*  unknown_;
+  WebPChunk*      unknown_;
+  int             canvas_width_;
+  int             canvas_height_;
 };
 
 // CHUNK_INDEX enum: used for indexing within 'kChunks' (defined below) only.
@@ -65,13 +77,14 @@ struct WebPMux {
 typedef enum {
   IDX_VP8X = 0,
   IDX_ICCP,
-  IDX_LOOP,
-  IDX_FRAME,
-  IDX_TILE,
+  IDX_ANIM,
+  IDX_ANMF,
+  IDX_FRGM,
   IDX_ALPHA,
   IDX_VP8,
   IDX_VP8L,
-  IDX_META,
+  IDX_EXIF,
+  IDX_XMP,
   IDX_UNKNOWN,
 
   IDX_NIL,
@@ -80,8 +93,6 @@ typedef enum {
 
 #define NIL_TAG 0x00000000u  // To signal void chunk.
 
-#define MKFOURCC(a, b, c, d) ((uint32_t)(a) | (b) << 8 | (c) << 16 | (d) << 24)
-
 typedef struct {
   uint32_t      tag;
   WebPChunkId   id;
@@ -91,55 +102,23 @@ typedef struct {
 extern const ChunkInfo kChunks[IDX_LAST_CHUNK];
 
 //------------------------------------------------------------------------------
-// Helper functions.
-
-// Read 16, 24 or 32 bits stored in little-endian order.
-static WEBP_INLINE int GetLE16(const uint8_t* const data) {
-  return (int)(data[0] << 0) | (data[1] << 8);
-}
-
-static WEBP_INLINE int GetLE24(const uint8_t* const data) {
-  return GetLE16(data) | (data[2] << 16);
-}
-
-static WEBP_INLINE uint32_t GetLE32(const uint8_t* const data) {
-  return (uint32_t)GetLE16(data) | (GetLE16(data + 2) << 16);
-}
-
-// Store 16, 24 or 32 bits in little-endian order.
-static WEBP_INLINE void PutLE16(uint8_t* const data, int val) {
-  assert(val < (1 << 16));
-  data[0] = (val >> 0);
-  data[1] = (val >> 8);
-}
-
-static WEBP_INLINE void PutLE24(uint8_t* const data, int val) {
-  assert(val < (1 << 24));
-  PutLE16(data, val & 0xffff);
-  data[2] = (val >> 16);
-}
-
-static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
-  PutLE16(data, (int)(val & 0xffff));
-  PutLE16(data + 2, (int)(val >> 16));
-}
-
-static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) {
-  return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U);
-}
-
-//------------------------------------------------------------------------------
 // Chunk object management.
 
 // Initialize.
 void ChunkInit(WebPChunk* const chunk);
 
-// Get chunk index from chunk tag. Returns IDX_NIL if not found.
+// Get chunk index from chunk tag. Returns IDX_UNKNOWN if not found.
 CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag);
 
-// Get chunk id from chunk tag. Returns WEBP_CHUNK_NIL if not found.
+// Get chunk id from chunk tag. Returns WEBP_CHUNK_UNKNOWN if not found.
 WebPChunkId ChunkGetIdFromTag(uint32_t tag);
 
+// Convert a fourcc string to a tag.
+uint32_t ChunkGetTagFromFourCC(const char fourcc[4]);
+
+// Get chunk index from fourcc. Returns IDX_UNKNOWN if given fourcc is unknown.
+CHUNK_INDEX ChunkGetIndexFromFourCC(const char fourcc[4]);
+
 // Search for nth chunk with given 'tag' in the chunk list.
 // nth = 0 means "last of the list".
 WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag);
@@ -150,7 +129,8 @@ WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data,
 
 // Sets 'chunk' at nth position in the 'chunk_list'.
 // nth = 0 has the special meaning "last of the list".
-WebPMuxError ChunkSetNth(const WebPChunk* chunk, WebPChunk** chunk_list,
+// On success ownership is transferred from 'chunk' to the 'chunk_list'.
+WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list,
                          uint32_t nth);
 
 // Releases chunk and returns chunk->next_.
@@ -159,23 +139,27 @@ WebPChunk* ChunkRelease(WebPChunk* const chunk);
 // Deletes given chunk & returns chunk->next_.
 WebPChunk* ChunkDelete(WebPChunk* const chunk);
 
+// Deletes all chunks in the given chunk list.
+void ChunkListDelete(WebPChunk** const chunk_list);
+
+// Returns size of the chunk including chunk header and padding byte (if any).
+static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) {
+  return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U);
+}
+
 // Size of a chunk including header and padding.
 static WEBP_INLINE size_t ChunkDiskSize(const WebPChunk* chunk) {
-  const size_t data_size = chunk->data_.size_;
+  const size_t data_size = chunk->data_.size;
   assert(data_size < MAX_CHUNK_PAYLOAD);
   return SizeWithPadding(data_size);
 }
 
 // Total size of a list of chunks.
-size_t ChunksListDiskSize(const WebPChunk* chunk_list);
+size_t ChunkListDiskSize(const WebPChunk* chunk_list);
 
 // Write out the given list of chunks into 'dst'.
 uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst);
 
-// Get the width & height of image stored in 'image_chunk'.
-WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
-                                    int* const width, int* const height);
-
 //------------------------------------------------------------------------------
 // MuxImage object management.
 
@@ -189,82 +173,59 @@ WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi);
 // 'wpi' can be NULL.
 WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi);
 
-// Delete all images in 'wpi_list'.
-void MuxImageDeleteAll(WebPMuxImage** const wpi_list);
-
 // Count number of images matching the given tag id in the 'wpi_list'.
+// If id == WEBP_CHUNK_NIL, all images will be matched.
 int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id);
 
+// Update width/height/has_alpha info from chunks within wpi.
+// Also remove ALPH chunk if not needed.
+int MuxImageFinalize(WebPMuxImage* const wpi);
+
 // Check if given ID corresponds to an image related chunk.
 static WEBP_INLINE int IsWPI(WebPChunkId id) {
   switch (id) {
-    case WEBP_CHUNK_FRAME:
-    case WEBP_CHUNK_TILE:
+    case WEBP_CHUNK_ANMF:
+    case WEBP_CHUNK_FRGM:
     case WEBP_CHUNK_ALPHA:
     case WEBP_CHUNK_IMAGE:  return 1;
     default:        return 0;
   }
 }
 
-// Get a reference to appropriate chunk list within an image given chunk tag.
-static WEBP_INLINE WebPChunk** MuxImageGetListFromId(
-    const WebPMuxImage* const wpi, WebPChunkId id) {
-  assert(wpi != NULL);
-  switch (id) {
-    case WEBP_CHUNK_FRAME:
-    case WEBP_CHUNK_TILE:  return (WebPChunk**)&wpi->header_;
-    case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
-    case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
-    default: return NULL;
-  }
-}
-
 // Pushes 'wpi' at the end of 'wpi_list'.
 WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list);
 
-// Delete nth image in the image list with given tag id.
-WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
-                               WebPChunkId id);
+// Delete nth image in the image list.
+WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth);
 
-// Get nth image in the image list with given tag id.
+// Get nth image in the image list.
 WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
-                            WebPChunkId id, WebPMuxImage** wpi);
+                            WebPMuxImage** wpi);
 
 // Total size of the given image.
 size_t MuxImageDiskSize(const WebPMuxImage* const wpi);
 
-// Total size of a list of images.
-size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list);
-
 // Write out the given image into 'dst'.
 uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst);
 
-// Write out the given list of images into 'dst'.
-uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst);
-
 //------------------------------------------------------------------------------
 // Helper methods for mux.
 
-// Checks if the given image list contains at least one lossless image.
-int MuxHasLosslessImages(const WebPMuxImage* images);
+// Checks if the given image list contains at least one image with alpha.
+int MuxHasAlpha(const WebPMuxImage* images);
 
 // Write out RIFF header into 'data', given total data size 'size'.
 uint8_t* MuxEmitRiffHeader(uint8_t* const data, size_t size);
 
 // Returns the list where chunk with given ID is to be inserted in mux.
-// Return value is NULL if this chunk should be inserted in mux->images_ list
-// or if 'id' is not known.
 WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id);
 
-// Validates that the given mux has a single image.
-WebPMuxError MuxValidateForImage(const WebPMux* const mux);
-
 // Validates the given mux object.
 WebPMuxError MuxValidate(const WebPMux* const mux);
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
+#ifdef __cplusplus
 }    // extern "C"
 #endif
 
diff --git a/drivers/webp/mux/muxinternal.c b/drivers/webp/mux/muxinternal.c
index 6c3c4fe60a..4babbe82fc 100644
--- a/drivers/webp/mux/muxinternal.c
+++ b/drivers/webp/mux/muxinternal.c
@@ -1,8 +1,10 @@
 // Copyright 2011 Google Inc. All Rights Reserved.
 //
-// This code is licensed under the same terms as WebM:
-//  Software License Agreement:  http://www.webmproject.org/license/software/
-//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Internal objects and utils for mux.
@@ -12,29 +14,33 @@
 
 #include <assert.h>
 #include "./muxi.h"
-
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
+#include "../utils/utils.h"
 
 #define UNDEFINED_CHUNK_SIZE (-1)
 
 const ChunkInfo kChunks[] = {
   { MKFOURCC('V', 'P', '8', 'X'),  WEBP_CHUNK_VP8X,    VP8X_CHUNK_SIZE },
   { MKFOURCC('I', 'C', 'C', 'P'),  WEBP_CHUNK_ICCP,    UNDEFINED_CHUNK_SIZE },
-  { MKFOURCC('L', 'O', 'O', 'P'),  WEBP_CHUNK_LOOP,    LOOP_CHUNK_SIZE },
-  { MKFOURCC('F', 'R', 'M', ' '),  WEBP_CHUNK_FRAME,   FRAME_CHUNK_SIZE },
-  { MKFOURCC('T', 'I', 'L', 'E'),  WEBP_CHUNK_TILE,    TILE_CHUNK_SIZE },
+  { MKFOURCC('A', 'N', 'I', 'M'),  WEBP_CHUNK_ANIM,    ANIM_CHUNK_SIZE },
+  { MKFOURCC('A', 'N', 'M', 'F'),  WEBP_CHUNK_ANMF,    ANMF_CHUNK_SIZE },
+  { MKFOURCC('F', 'R', 'G', 'M'),  WEBP_CHUNK_FRGM,    FRGM_CHUNK_SIZE },
   { MKFOURCC('A', 'L', 'P', 'H'),  WEBP_CHUNK_ALPHA,   UNDEFINED_CHUNK_SIZE },
   { MKFOURCC('V', 'P', '8', ' '),  WEBP_CHUNK_IMAGE,   UNDEFINED_CHUNK_SIZE },
   { MKFOURCC('V', 'P', '8', 'L'),  WEBP_CHUNK_IMAGE,   UNDEFINED_CHUNK_SIZE },
-  { MKFOURCC('M', 'E', 'T', 'A'),  WEBP_CHUNK_META,    UNDEFINED_CHUNK_SIZE },
-  { MKFOURCC('U', 'N', 'K', 'N'),  WEBP_CHUNK_UNKNOWN, UNDEFINED_CHUNK_SIZE },
+  { MKFOURCC('E', 'X', 'I', 'F'),  WEBP_CHUNK_EXIF,    UNDEFINED_CHUNK_SIZE },
+  { MKFOURCC('X', 'M', 'P', ' '),  WEBP_CHUNK_XMP,     UNDEFINED_CHUNK_SIZE },
+  { NIL_TAG,                       WEBP_CHUNK_UNKNOWN, UNDEFINED_CHUNK_SIZE },
 
-  { NIL_TAG,                    WEBP_CHUNK_NIL,     UNDEFINED_CHUNK_SIZE }
+  { NIL_TAG,                       WEBP_CHUNK_NIL,     UNDEFINED_CHUNK_SIZE }
 };
 
 //------------------------------------------------------------------------------
+
+int WebPGetMuxVersion(void) {
+  return (MUX_MAJ_VERSION << 16) | (MUX_MIN_VERSION << 8) | MUX_REV_VERSION;
+}
+
+//------------------------------------------------------------------------------
 // Life of a chunk object.
 
 void ChunkInit(WebPChunk* const chunk) {
@@ -60,9 +66,9 @@ WebPChunk* ChunkRelease(WebPChunk* const chunk) {
 CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag) {
   int i;
   for (i = 0; kChunks[i].tag != NIL_TAG; ++i) {
-    if (tag == kChunks[i].tag) return i;
+    if (tag == kChunks[i].tag) return (CHUNK_INDEX)i;
   }
-  return IDX_NIL;
+  return IDX_UNKNOWN;
 }
 
 WebPChunkId ChunkGetIdFromTag(uint32_t tag) {
@@ -70,7 +76,16 @@ WebPChunkId ChunkGetIdFromTag(uint32_t tag) {
   for (i = 0; kChunks[i].tag != NIL_TAG; ++i) {
     if (tag == kChunks[i].tag) return kChunks[i].id;
   }
-  return WEBP_CHUNK_NIL;
+  return WEBP_CHUNK_UNKNOWN;
+}
+
+uint32_t ChunkGetTagFromFourCC(const char fourcc[4]) {
+  return MKFOURCC(fourcc[0], fourcc[1], fourcc[2], fourcc[3]);
+}
+
+CHUNK_INDEX ChunkGetIndexFromFourCC(const char fourcc[4]) {
+  const uint32_t tag = ChunkGetTagFromFourCC(fourcc);
+  return ChunkGetIndexFromTag(tag);
 }
 
 //------------------------------------------------------------------------------
@@ -78,7 +93,7 @@ WebPChunkId ChunkGetIdFromTag(uint32_t tag) {
 
 // Returns next chunk in the chunk list with the given tag.
 static WebPChunk* ChunkSearchNextInList(WebPChunk* chunk, uint32_t tag) {
-  while (chunk && chunk->tag_ != tag) {
+  while (chunk != NULL && chunk->tag_ != tag) {
     chunk = chunk->next_;
   }
   return chunk;
@@ -87,7 +102,7 @@ static WebPChunk* ChunkSearchNextInList(WebPChunk* chunk, uint32_t tag) {
 WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag) {
   uint32_t iter = nth;
   first = ChunkSearchNextInList(first, tag);
-  if (!first) return NULL;
+  if (first == NULL) return NULL;
 
   while (--iter != 0) {
     WebPChunk* next_chunk = ChunkSearchNextInList(first->next_, tag);
@@ -99,14 +114,14 @@ WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag) {
 
 // Outputs a pointer to 'prev_chunk->next_',
 //   where 'prev_chunk' is the pointer to the chunk at position (nth - 1).
-// Returns 1 if nth chunk was found, 0 otherwise.
+// Returns true if nth chunk was found.
 static int ChunkSearchListToSet(WebPChunk** chunk_list, uint32_t nth,
                                 WebPChunk*** const location) {
   uint32_t count = 0;
-  assert(chunk_list);
+  assert(chunk_list != NULL);
   *location = chunk_list;
 
-  while (*chunk_list) {
+  while (*chunk_list != NULL) {
     WebPChunk* const cur_chunk = *chunk_list;
     ++count;
     if (count == nth) return 1;  // Found.
@@ -124,34 +139,25 @@ static int ChunkSearchListToSet(WebPChunk** chunk_list, uint32_t nth,
 WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data,
                              int copy_data, uint32_t tag) {
   // For internally allocated chunks, always copy data & make it owner of data.
-  if (tag == kChunks[IDX_VP8X].tag || tag == kChunks[IDX_LOOP].tag) {
+  if (tag == kChunks[IDX_VP8X].tag || tag == kChunks[IDX_ANIM].tag) {
     copy_data = 1;
   }
 
   ChunkRelease(chunk);
 
   if (data != NULL) {
-    if (copy_data) {
-      // Copy data.
-      chunk->data_.bytes_ = (uint8_t*)malloc(data->size_);
-      if (chunk->data_.bytes_ == NULL) return WEBP_MUX_MEMORY_ERROR;
-      memcpy((uint8_t*)chunk->data_.bytes_, data->bytes_, data->size_);
-      chunk->data_.size_ = data->size_;
-
-      // Chunk is owner of data.
-      chunk->owner_ = 1;
-    } else {
-      // Don't copy data.
+    if (copy_data) {        // Copy data.
+      if (!WebPDataCopy(data, &chunk->data_)) return WEBP_MUX_MEMORY_ERROR;
+      chunk->owner_ = 1;    // Chunk is owner of data.
+    } else {                // Don't copy data.
       chunk->data_ = *data;
     }
   }
-
   chunk->tag_ = tag;
-
   return WEBP_MUX_OK;
 }
 
-WebPMuxError ChunkSetNth(const WebPChunk* chunk, WebPChunk** chunk_list,
+WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list,
                          uint32_t nth) {
   WebPChunk* new_chunk;
 
@@ -159,9 +165,10 @@ WebPMuxError ChunkSetNth(const WebPChunk* chunk, WebPChunk** chunk_list,
     return WEBP_MUX_NOT_FOUND;
   }
 
-  new_chunk = (WebPChunk*)malloc(sizeof(*new_chunk));
+  new_chunk = (WebPChunk*)WebPSafeMalloc(1ULL, sizeof(*new_chunk));
   if (new_chunk == NULL) return WEBP_MUX_MEMORY_ERROR;
   *new_chunk = *chunk;
+  chunk->owner_ = 0;
   new_chunk->next_ = *chunk_list;
   *chunk_list = new_chunk;
   return WEBP_MUX_OK;
@@ -172,70 +179,47 @@ WebPMuxError ChunkSetNth(const WebPChunk* chunk, WebPChunk** chunk_list,
 
 WebPChunk* ChunkDelete(WebPChunk* const chunk) {
   WebPChunk* const next = ChunkRelease(chunk);
-  free(chunk);
+  WebPSafeFree(chunk);
   return next;
 }
 
-//------------------------------------------------------------------------------
-// Chunk serialization methods.
-
-size_t ChunksListDiskSize(const WebPChunk* chunk_list) {
-  size_t size = 0;
-  while (chunk_list) {
-    size += ChunkDiskSize(chunk_list);
-    chunk_list = chunk_list->next_;
+void ChunkListDelete(WebPChunk** const chunk_list) {
+  while (*chunk_list != NULL) {
+    *chunk_list = ChunkDelete(*chunk_list);
   }
-  return size;
 }
 
+//------------------------------------------------------------------------------
+// Chunk serialization methods.
+
 static uint8_t* ChunkEmit(const WebPChunk* const chunk, uint8_t* dst) {
-  const size_t chunk_size = chunk->data_.size_;
+  const size_t chunk_size = chunk->data_.size;
   assert(chunk);
   assert(chunk->tag_ != NIL_TAG);
   PutLE32(dst + 0, chunk->tag_);
   PutLE32(dst + TAG_SIZE, (uint32_t)chunk_size);
   assert(chunk_size == (uint32_t)chunk_size);
-  memcpy(dst + CHUNK_HEADER_SIZE, chunk->data_.bytes_, chunk_size);
+  memcpy(dst + CHUNK_HEADER_SIZE, chunk->data_.bytes, chunk_size);
   if (chunk_size & 1)
     dst[CHUNK_HEADER_SIZE + chunk_size] = 0;  // Add padding.
   return dst + ChunkDiskSize(chunk);
 }
 
 uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst) {
-  while (chunk_list) {
+  while (chunk_list != NULL) {
     dst = ChunkEmit(chunk_list, dst);
     chunk_list = chunk_list->next_;
   }
   return dst;
 }
 
-//------------------------------------------------------------------------------
-// Manipulation of a WebPData object.
-
-void WebPDataInit(WebPData* webp_data) {
-  if (webp_data != NULL) {
-    memset(webp_data, 0, sizeof(*webp_data));
-  }
-}
-
-void WebPDataClear(WebPData* webp_data) {
-  if (webp_data != NULL) {
-    free((void*)webp_data->bytes_);
-    WebPDataInit(webp_data);
-  }
-}
-
-int WebPDataCopy(const WebPData* src, WebPData* dst) {
-  if (src == NULL || dst == NULL) return 0;
-
-  WebPDataInit(dst);
-  if (src->bytes_ != NULL && src->size_ != 0) {
-    dst->bytes_ = (uint8_t*)malloc(src->size_);
-    if (dst->bytes_ == NULL) return 0;
-    memcpy((void*)dst->bytes_, src->bytes_, src->size_);
-    dst->size_ = src->size_;
+size_t ChunkListDiskSize(const WebPChunk* chunk_list) {
+  size_t size = 0;
+  while (chunk_list != NULL) {
+    size += ChunkDiskSize(chunk_list);
+    chunk_list = chunk_list->next_;
   }
-  return 1;
+  return size;
 }
 
 //------------------------------------------------------------------------------
@@ -252,6 +236,7 @@ WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi) {
   ChunkDelete(wpi->header_);
   ChunkDelete(wpi->alpha_);
   ChunkDelete(wpi->img_);
+  ChunkListDelete(&wpi->unknown_);
 
   next = wpi->next_;
   MuxImageInit(wpi);
@@ -261,14 +246,31 @@ WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi) {
 //------------------------------------------------------------------------------
 // MuxImage search methods.
 
+// Get a reference to appropriate chunk list within an image given chunk tag.
+static WebPChunk** GetChunkListFromId(const WebPMuxImage* const wpi,
+                                      WebPChunkId id) {
+  assert(wpi != NULL);
+  switch (id) {
+    case WEBP_CHUNK_ANMF:
+    case WEBP_CHUNK_FRGM:  return (WebPChunk**)&wpi->header_;
+    case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
+    case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
+    default: return NULL;
+  }
+}
+
 int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
   int count = 0;
   const WebPMuxImage* current;
   for (current = wpi_list; current != NULL; current = current->next_) {
-    const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(current, id);
-    if (wpi_chunk != NULL) {
-      const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
-      if (wpi_chunk_id == id) ++count;
+    if (id == WEBP_CHUNK_NIL) {
+      ++count;  // Special case: count all images.
+    } else {
+      const WebPChunk* const wpi_chunk = *GetChunkListFromId(current, id);
+      if (wpi_chunk != NULL) {
+        const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
+        if (wpi_chunk_id == id) ++count;  // Count images with a matching 'id'.
+      }
     }
   }
   return count;
@@ -276,34 +278,22 @@ int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
 
 // Outputs a pointer to 'prev_wpi->next_',
 //   where 'prev_wpi' is the pointer to the image at position (nth - 1).
-// Returns 1 if nth image with given id was found, 0 otherwise.
+// Returns true if nth image was found.
 static int SearchImageToGetOrDelete(WebPMuxImage** wpi_list, uint32_t nth,
-                                    WebPChunkId id,
                                     WebPMuxImage*** const location) {
   uint32_t count = 0;
   assert(wpi_list);
   *location = wpi_list;
 
-  // Search makes sense only for the following.
-  assert(id == WEBP_CHUNK_FRAME || id == WEBP_CHUNK_TILE ||
-         id == WEBP_CHUNK_IMAGE);
-  assert(id != WEBP_CHUNK_IMAGE || nth == 1);
-
   if (nth == 0) {
-    nth = MuxImageCount(*wpi_list, id);
+    nth = MuxImageCount(*wpi_list, WEBP_CHUNK_NIL);
     if (nth == 0) return 0;  // Not found.
   }
 
-  while (*wpi_list) {
+  while (*wpi_list != NULL) {
     WebPMuxImage* const cur_wpi = *wpi_list;
-    const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(cur_wpi, id);
-    if (wpi_chunk != NULL) {
-      const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
-      if (wpi_chunk_id == id) {
-        ++count;
-        if (count == nth) return 1;  // Found.
-      }
-    }
+    ++count;
+    if (count == nth) return 1;  // Found.
     wpi_list = &cur_wpi->next_;
     *location = wpi_list;
   }
@@ -322,7 +312,7 @@ WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list) {
     wpi_list = &cur_wpi->next_;
   }
 
-  new_wpi = (WebPMuxImage*)malloc(sizeof(*new_wpi));
+  new_wpi = (WebPMuxImage*)WebPSafeMalloc(1ULL, sizeof(*new_wpi));
   if (new_wpi == NULL) return WEBP_MUX_MEMORY_ERROR;
   *new_wpi = *wpi;
   new_wpi->next_ = NULL;
@@ -341,20 +331,13 @@ WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list) {
 WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi) {
   // Delete the components of wpi. If wpi is NULL this is a noop.
   WebPMuxImage* const next = MuxImageRelease(wpi);
-  free(wpi);
+  WebPSafeFree(wpi);
   return next;
 }
 
-void MuxImageDeleteAll(WebPMuxImage** const wpi_list) {
-  while (*wpi_list) {
-    *wpi_list = MuxImageDelete(*wpi_list);
-  }
-}
-
-WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
-                               WebPChunkId id) {
+WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth) {
   assert(wpi_list);
-  if (!SearchImageToGetOrDelete(wpi_list, nth, id, &wpi_list)) {
+  if (!SearchImageToGetOrDelete(wpi_list, nth, &wpi_list)) {
     return WEBP_MUX_NOT_FOUND;
   }
   *wpi_list = MuxImageDelete(*wpi_list);
@@ -365,10 +348,10 @@ WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth,
 // MuxImage reader methods.
 
 WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
-                            WebPChunkId id, WebPMuxImage** wpi) {
+                            WebPMuxImage** wpi) {
   assert(wpi_list);
   assert(wpi);
-  if (!SearchImageToGetOrDelete((WebPMuxImage**)wpi_list, nth, id,
+  if (!SearchImageToGetOrDelete((WebPMuxImage**)wpi_list, nth,
                                 (WebPMuxImage***)&wpi_list)) {
     return WEBP_MUX_NOT_FOUND;
   }
@@ -385,47 +368,48 @@ size_t MuxImageDiskSize(const WebPMuxImage* const wpi) {
   if (wpi->header_ != NULL) size += ChunkDiskSize(wpi->header_);
   if (wpi->alpha_ != NULL) size += ChunkDiskSize(wpi->alpha_);
   if (wpi->img_ != NULL) size += ChunkDiskSize(wpi->img_);
+  if (wpi->unknown_ != NULL) size += ChunkListDiskSize(wpi->unknown_);
   return size;
 }
 
-size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list) {
-  size_t size = 0;
-  while (wpi_list) {
-    size += MuxImageDiskSize(wpi_list);
-    wpi_list = wpi_list->next_;
+// Special case as ANMF/FRGM chunk encapsulates other image chunks.
+static uint8_t* ChunkEmitSpecial(const WebPChunk* const header,
+                                 size_t total_size, uint8_t* dst) {
+  const size_t header_size = header->data_.size;
+  const size_t offset_to_next = total_size - CHUNK_HEADER_SIZE;
+  assert(header->tag_ == kChunks[IDX_ANMF].tag ||
+         header->tag_ == kChunks[IDX_FRGM].tag);
+  PutLE32(dst + 0, header->tag_);
+  PutLE32(dst + TAG_SIZE, (uint32_t)offset_to_next);
+  assert(header_size == (uint32_t)header_size);
+  memcpy(dst + CHUNK_HEADER_SIZE, header->data_.bytes, header_size);
+  if (header_size & 1) {
+    dst[CHUNK_HEADER_SIZE + header_size] = 0;  // Add padding.
   }
-  return size;
+  return dst + ChunkDiskSize(header);
 }
 
 uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst) {
   // Ordering of chunks to be emitted is strictly as follows:
-  // 1. Frame/Tile chunk (if present).
-  // 2. Alpha chunk (if present).
+  // 1. ANMF/FRGM chunk (if present).
+  // 2. ALPH chunk (if present).
   // 3. VP8/VP8L chunk.
   assert(wpi);
-  if (wpi->header_ != NULL) dst = ChunkEmit(wpi->header_, dst);
+  if (wpi->header_ != NULL) {
+    dst = ChunkEmitSpecial(wpi->header_, MuxImageDiskSize(wpi), dst);
+  }
   if (wpi->alpha_ != NULL) dst = ChunkEmit(wpi->alpha_, dst);
   if (wpi->img_ != NULL) dst = ChunkEmit(wpi->img_, dst);
-  return dst;
-}
-
-uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst) {
-  while (wpi_list) {
-    dst = MuxImageEmit(wpi_list, dst);
-    wpi_list = wpi_list->next_;
-  }
+  if (wpi->unknown_ != NULL) dst = ChunkListEmit(wpi->unknown_, dst);
   return dst;
 }
 
 //------------------------------------------------------------------------------
 // Helper methods for mux.
 
-int MuxHasLosslessImages(const WebPMuxImage* images) {
+int MuxHasAlpha(const WebPMuxImage* images) {
   while (images != NULL) {
-    assert(images->img_ != NULL);
-    if (images->img_->tag_ == kChunks[IDX_VP8L].tag) {
-      return 1;
-    }
+    if (images->has_alpha_) return 1;
     images = images->next_;
   }
   return 0;
@@ -441,30 +425,13 @@ uint8_t* MuxEmitRiffHeader(uint8_t* const data, size_t size) {
 
 WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id) {
   assert(mux != NULL);
-  switch(id) {
+  switch (id) {
     case WEBP_CHUNK_VP8X:    return (WebPChunk**)&mux->vp8x_;
     case WEBP_CHUNK_ICCP:    return (WebPChunk**)&mux->iccp_;
-    case WEBP_CHUNK_LOOP:    return (WebPChunk**)&mux->loop_;
-    case WEBP_CHUNK_META:    return (WebPChunk**)&mux->meta_;
-    case WEBP_CHUNK_UNKNOWN: return (WebPChunk**)&mux->unknown_;
-    default: return NULL;
-  }
-}
-
-WebPMuxError MuxValidateForImage(const WebPMux* const mux) {
-  const int num_images = MuxImageCount(mux->images_, WEBP_CHUNK_IMAGE);
-  const int num_frames = MuxImageCount(mux->images_, WEBP_CHUNK_FRAME);
-  const int num_tiles  = MuxImageCount(mux->images_, WEBP_CHUNK_TILE);
-
-  if (num_images == 0) {
-    // No images in mux.
-    return WEBP_MUX_NOT_FOUND;
-  } else if (num_images == 1 && num_frames == 0 && num_tiles == 0) {
-    // Valid case (single image).
-    return WEBP_MUX_OK;
-  } else {
-    // Frame/Tile case OR an invalid mux.
-    return WEBP_MUX_INVALID_ARGUMENT;
+    case WEBP_CHUNK_ANIM:    return (WebPChunk**)&mux->anim_;
+    case WEBP_CHUNK_EXIF:    return (WebPChunk**)&mux->exif_;
+    case WEBP_CHUNK_XMP:     return (WebPChunk**)&mux->xmp_;
+    default:                 return (WebPChunk**)&mux->unknown_;
   }
 }
 
@@ -480,7 +447,7 @@ static int IsNotCompatible(int feature, int num_items) {
 // On success returns WEBP_MUX_OK and stores the chunk count in *num.
 static WebPMuxError ValidateChunk(const WebPMux* const mux, CHUNK_INDEX idx,
                                   WebPFeatureFlags feature,
-                                  WebPFeatureFlags vp8x_flags,
+                                  uint32_t vp8x_flags,
                                   int max, int* num) {
   const WebPMuxError err =
       WebPMuxNumChunks(mux, kChunks[idx].id, num);
@@ -494,10 +461,11 @@ static WebPMuxError ValidateChunk(const WebPMux* const mux, CHUNK_INDEX idx,
 
 WebPMuxError MuxValidate(const WebPMux* const mux) {
   int num_iccp;
-  int num_meta;
-  int num_loop_chunks;
+  int num_exif;
+  int num_xmp;
+  int num_anim;
   int num_frames;
-  int num_tiles;
+  int num_fragments;
   int num_vp8x;
   int num_images;
   int num_alpha;
@@ -517,29 +485,33 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
   err = ValidateChunk(mux, IDX_ICCP, ICCP_FLAG, flags, 1, &num_iccp);
   if (err != WEBP_MUX_OK) return err;
 
+  // At most one EXIF metadata.
+  err = ValidateChunk(mux, IDX_EXIF, EXIF_FLAG, flags, 1, &num_exif);
+  if (err != WEBP_MUX_OK) return err;
+
   // At most one XMP metadata.
-  err = ValidateChunk(mux, IDX_META, META_FLAG, flags, 1, &num_meta);
+  err = ValidateChunk(mux, IDX_XMP, XMP_FLAG, flags, 1, &num_xmp);
   if (err != WEBP_MUX_OK) return err;
 
-  // Animation: ANIMATION_FLAG, loop chunk and frame chunk(s) are consistent.
-  // At most one loop chunk.
-  err = ValidateChunk(mux, IDX_LOOP, NO_FLAG, flags, 1, &num_loop_chunks);
+  // Animation: ANIMATION_FLAG, ANIM chunk and ANMF chunk(s) are consistent.
+  // At most one ANIM chunk.
+  err = ValidateChunk(mux, IDX_ANIM, NO_FLAG, flags, 1, &num_anim);
   if (err != WEBP_MUX_OK) return err;
-  err = ValidateChunk(mux, IDX_FRAME, NO_FLAG, flags, -1, &num_frames);
+  err = ValidateChunk(mux, IDX_ANMF, NO_FLAG, flags, -1, &num_frames);
   if (err != WEBP_MUX_OK) return err;
 
   {
     const int has_animation = !!(flags & ANIMATION_FLAG);
-    if (has_animation && (num_loop_chunks == 0 || num_frames == 0)) {
+    if (has_animation && (num_anim == 0 || num_frames == 0)) {
       return WEBP_MUX_INVALID_ARGUMENT;
     }
-    if (!has_animation && (num_loop_chunks == 1 || num_frames > 0)) {
+    if (!has_animation && (num_anim == 1 || num_frames > 0)) {
       return WEBP_MUX_INVALID_ARGUMENT;
     }
   }
 
-  // Tiling: TILE_FLAG and tile chunk(s) are consistent.
-  err = ValidateChunk(mux, IDX_TILE, TILE_FLAG, flags, -1, &num_tiles);
+  // Fragmentation: FRAGMENTS_FLAG and FRGM chunk(s) are consistent.
+  err = ValidateChunk(mux, IDX_FRGM, FRAGMENTS_FLAG, flags, -1, &num_fragments);
   if (err != WEBP_MUX_OK) return err;
 
   // Verify either VP8X chunk is present OR there is only one elem in
@@ -551,16 +523,22 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
   if (num_vp8x == 0 && num_images != 1) return WEBP_MUX_INVALID_ARGUMENT;
 
   // ALPHA_FLAG & alpha chunk(s) are consistent.
-  if (num_vp8x > 0 && MuxHasLosslessImages(mux->images_)) {
-    // Special case: we have a VP8X chunk as well as some lossless images.
-    if (!(flags & ALPHA_FLAG)) return WEBP_MUX_INVALID_ARGUMENT;
-  } else {
-    err = ValidateChunk(mux, IDX_ALPHA, ALPHA_FLAG, flags, -1, &num_alpha);
-    if (err != WEBP_MUX_OK) return err;
+  if (MuxHasAlpha(mux->images_)) {
+    if (num_vp8x > 0) {
+      // VP8X chunk is present, so it should contain ALPHA_FLAG.
+      if (!(flags & ALPHA_FLAG)) return WEBP_MUX_INVALID_ARGUMENT;
+    } else {
+      // VP8X chunk is not present, so ALPH chunks should NOT be present either.
+      err = WebPMuxNumChunks(mux, WEBP_CHUNK_ALPHA, &num_alpha);
+      if (err != WEBP_MUX_OK) return err;
+      if (num_alpha > 0) return WEBP_MUX_INVALID_ARGUMENT;
+    }
+  } else {  // Mux doesn't need alpha. So, ALPHA_FLAG should NOT be present.
+    if (flags & ALPHA_FLAG) return WEBP_MUX_INVALID_ARGUMENT;
   }
 
-  // num_tiles & num_images are consistent.
-  if (num_tiles > 0 && num_images != num_tiles) {
+  // num_fragments & num_images are consistent.
+  if (num_fragments > 0 && num_images != num_fragments) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
@@ -571,6 +549,3 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif
diff --git a/drivers/webp/mux/muxread.c b/drivers/webp/mux/muxread.c
index 21c3cfbaeb..8957a1e46e 100644
--- a/drivers/webp/mux/muxread.c
+++ b/drivers/webp/mux/muxread.c
@@ -1,8 +1,10 @@
 // Copyright 2011 Google Inc. All Rights Reserved.
 //
-// This code is licensed under the same terms as WebM:
-//  Software License Agreement:  http://www.webmproject.org/license/software/
-//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Read APIs for mux.
@@ -12,10 +14,7 @@
 
 #include <assert.h>
 #include "./muxi.h"
-
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
+#include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
 // Helper method(s).
@@ -41,8 +40,9 @@ static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx,
 
   SWITCH_ID_LIST(IDX_VP8X, mux->vp8x_);
   SWITCH_ID_LIST(IDX_ICCP, mux->iccp_);
-  SWITCH_ID_LIST(IDX_LOOP, mux->loop_);
-  SWITCH_ID_LIST(IDX_META, mux->meta_);
+  SWITCH_ID_LIST(IDX_ANIM, mux->anim_);
+  SWITCH_ID_LIST(IDX_EXIF, mux->exif_);
+  SWITCH_ID_LIST(IDX_XMP, mux->xmp_);
   SWITCH_ID_LIST(IDX_UNKNOWN, mux->unknown_);
   return WEBP_MUX_NOT_FOUND;
 }
@@ -50,15 +50,14 @@ static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx,
 
 // Fill the chunk with the given data (includes chunk header bytes), after some
 // verifications.
-static WebPMuxError ChunkVerifyAndAssignData(WebPChunk* chunk,
-                                             const uint8_t* data,
-                                             size_t data_size, size_t riff_size,
-                                             int copy_data) {
+static WebPMuxError ChunkVerifyAndAssign(WebPChunk* chunk,
+                                         const uint8_t* data, size_t data_size,
+                                         size_t riff_size, int copy_data) {
   uint32_t chunk_size;
   WebPData chunk_data;
 
   // Sanity checks.
-  if (data_size < TAG_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA;
+  if (data_size < CHUNK_HEADER_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA;
   chunk_size = GetLE32(data + TAG_SIZE);
 
   {
@@ -68,11 +67,103 @@ static WebPMuxError ChunkVerifyAndAssignData(WebPChunk* chunk,
   }
 
   // Data assignment.
-  chunk_data.bytes_ = data + CHUNK_HEADER_SIZE;
-  chunk_data.size_ = chunk_size;
+  chunk_data.bytes = data + CHUNK_HEADER_SIZE;
+  chunk_data.size = chunk_size;
   return ChunkAssignData(chunk, &chunk_data, copy_data, GetLE32(data + 0));
 }
 
+int MuxImageFinalize(WebPMuxImage* const wpi) {
+  const WebPChunk* const img = wpi->img_;
+  const WebPData* const image = &img->data_;
+  const int is_lossless = (img->tag_ == kChunks[IDX_VP8L].tag);
+  int w, h;
+  int vp8l_has_alpha = 0;
+  const int ok = is_lossless ?
+      VP8LGetInfo(image->bytes, image->size, &w, &h, &vp8l_has_alpha) :
+      VP8GetInfo(image->bytes, image->size, image->size, &w, &h);
+  assert(img != NULL);
+  if (ok) {
+    // Ignore ALPH chunk accompanying VP8L.
+    if (is_lossless && (wpi->alpha_ != NULL)) {
+      ChunkDelete(wpi->alpha_);
+      wpi->alpha_ = NULL;
+    }
+    wpi->width_ = w;
+    wpi->height_ = h;
+    wpi->has_alpha_ = vp8l_has_alpha || (wpi->alpha_ != NULL);
+  }
+  return ok;
+}
+
+static int MuxImageParse(const WebPChunk* const chunk, int copy_data,
+                         WebPMuxImage* const wpi) {
+  const uint8_t* bytes = chunk->data_.bytes;
+  size_t size = chunk->data_.size;
+  const uint8_t* const last = bytes + size;
+  WebPChunk subchunk;
+  size_t subchunk_size;
+  ChunkInit(&subchunk);
+
+  assert(chunk->tag_ == kChunks[IDX_ANMF].tag ||
+         chunk->tag_ == kChunks[IDX_FRGM].tag);
+  assert(!wpi->is_partial_);
+
+  // ANMF/FRGM.
+  {
+    const size_t hdr_size = (chunk->tag_ == kChunks[IDX_ANMF].tag) ?
+        ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE;
+    const WebPData temp = { bytes, hdr_size };
+    // Each of ANMF and FRGM chunk contain a header at the beginning. So, its
+    // size should at least be 'hdr_size'.
+    if (size < hdr_size) goto Fail;
+    ChunkAssignData(&subchunk, &temp, copy_data, chunk->tag_);
+  }
+  ChunkSetNth(&subchunk, &wpi->header_, 1);
+  wpi->is_partial_ = 1;  // Waiting for ALPH and/or VP8/VP8L chunks.
+
+  // Rest of the chunks.
+  subchunk_size = ChunkDiskSize(&subchunk) - CHUNK_HEADER_SIZE;
+  bytes += subchunk_size;
+  size -= subchunk_size;
+
+  while (bytes != last) {
+    ChunkInit(&subchunk);
+    if (ChunkVerifyAndAssign(&subchunk, bytes, size, size,
+                             copy_data) != WEBP_MUX_OK) {
+      goto Fail;
+    }
+    switch (ChunkGetIdFromTag(subchunk.tag_)) {
+      case WEBP_CHUNK_ALPHA:
+        if (wpi->alpha_ != NULL) goto Fail;  // Consecutive ALPH chunks.
+        if (ChunkSetNth(&subchunk, &wpi->alpha_, 1) != WEBP_MUX_OK) goto Fail;
+        wpi->is_partial_ = 1;  // Waiting for a VP8 chunk.
+        break;
+      case WEBP_CHUNK_IMAGE:
+        if (ChunkSetNth(&subchunk, &wpi->img_, 1) != WEBP_MUX_OK) goto Fail;
+        if (!MuxImageFinalize(wpi)) goto Fail;
+        wpi->is_partial_ = 0;  // wpi is completely filled.
+        break;
+      case WEBP_CHUNK_UNKNOWN:
+        if (wpi->is_partial_) goto Fail;  // Encountered an unknown chunk
+                                          // before some image chunks.
+        if (ChunkSetNth(&subchunk, &wpi->unknown_, 0) != WEBP_MUX_OK) goto Fail;
+        break;
+      default:
+        goto Fail;
+        break;
+    }
+    subchunk_size = ChunkDiskSize(&subchunk);
+    bytes += subchunk_size;
+    size -= subchunk_size;
+  }
+  if (wpi->is_partial_) goto Fail;
+  return 1;
+
+ Fail:
+  ChunkRelease(&subchunk);
+  return 0;
+}
+
 //------------------------------------------------------------------------------
 // Create a mux object from WebP-RIFF data.
 
@@ -94,8 +185,8 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
   }
   if (bitstream == NULL) return NULL;
 
-  data = bitstream->bytes_;
-  size = bitstream->size_;
+  data = bitstream->bytes;
+  size = bitstream->size;
 
   if (data == NULL) return NULL;
   if (size < RIFF_HEADER_SIZE) return NULL;
@@ -129,48 +220,55 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
   data += RIFF_HEADER_SIZE;
   size -= RIFF_HEADER_SIZE;
 
-  wpi = (WebPMuxImage*)malloc(sizeof(*wpi));
+  wpi = (WebPMuxImage*)WebPSafeMalloc(1ULL, sizeof(*wpi));
   if (wpi == NULL) goto Err;
   MuxImageInit(wpi);
 
   // Loop over chunks.
   while (data != end) {
+    size_t data_size;
     WebPChunkId id;
-    WebPMuxError err;
-
-    err = ChunkVerifyAndAssignData(&chunk, data, size, riff_size, copy_data);
-    if (err != WEBP_MUX_OK) goto Err;
-
+    WebPChunk** chunk_list;
+    if (ChunkVerifyAndAssign(&chunk, data, size, riff_size,
+                             copy_data) != WEBP_MUX_OK) {
+      goto Err;
+    }
+    data_size = ChunkDiskSize(&chunk);
     id = ChunkGetIdFromTag(chunk.tag_);
-
-    if (IsWPI(id)) {  // An image chunk (frame/tile/alpha/vp8).
-      WebPChunk** wpi_chunk_ptr =
-          MuxImageGetListFromId(wpi, id);  // Image chunk to set.
-      assert(wpi_chunk_ptr != NULL);
-      if (*wpi_chunk_ptr != NULL) goto Err;  // Consecutive alpha chunks or
-                                             // consecutive frame/tile chunks.
-      if (ChunkSetNth(&chunk, wpi_chunk_ptr, 1) != WEBP_MUX_OK) goto Err;
-      if (id == WEBP_CHUNK_IMAGE) {
+    switch (id) {
+      case WEBP_CHUNK_ALPHA:
+        if (wpi->alpha_ != NULL) goto Err;  // Consecutive ALPH chunks.
+        if (ChunkSetNth(&chunk, &wpi->alpha_, 1) != WEBP_MUX_OK) goto Err;
+        wpi->is_partial_ = 1;  // Waiting for a VP8 chunk.
+        break;
+      case WEBP_CHUNK_IMAGE:
+        if (ChunkSetNth(&chunk, &wpi->img_, 1) != WEBP_MUX_OK) goto Err;
+        if (!MuxImageFinalize(wpi)) goto Err;
         wpi->is_partial_ = 0;  // wpi is completely filled.
+ PushImage:
         // Add this to mux->images_ list.
         if (MuxImagePush(wpi, &mux->images_) != WEBP_MUX_OK) goto Err;
         MuxImageInit(wpi);  // Reset for reading next image.
-      } else {
-        wpi->is_partial_ = 1;  // wpi is only partially filled.
-      }
-    } else {  // A non-image chunk.
-      WebPChunk** chunk_list;
-      if (wpi->is_partial_) goto Err;  // Encountered a non-image chunk before
-                                       // getting all chunks of an image.
-      chunk_list = MuxGetChunkListFromId(mux, id);  // List to add this chunk.
-      if (chunk_list == NULL) chunk_list = &mux->unknown_;
-      if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
-    }
-    {
-      const size_t data_size = ChunkDiskSize(&chunk);
-      data += data_size;
-      size -= data_size;
+        break;
+      case WEBP_CHUNK_ANMF:
+        if (wpi->is_partial_) goto Err;  // Previous wpi is still incomplete.
+        if (!MuxImageParse(&chunk, copy_data, wpi)) goto Err;
+        ChunkRelease(&chunk);
+        goto PushImage;
+        break;
+      default:  // A non-image chunk.
+        if (wpi->is_partial_) goto Err;  // Encountered a non-image chunk before
+                                         // getting all chunks of an image.
+        chunk_list = MuxGetChunkListFromId(mux, id);  // List to add this chunk.
+        if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
+        if (id == WEBP_CHUNK_VP8X) {  // grab global specs
+          mux->canvas_width_ = GetLE24(data + 12) + 1;
+          mux->canvas_height_ = GetLE24(data + 15) + 1;
+        }
+        break;
     }
+    data += data_size;
+    size -= data_size;
     ChunkInit(&chunk);
   }
 
@@ -190,31 +288,74 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
 //------------------------------------------------------------------------------
 // Get API(s).
 
-WebPMuxError WebPMuxGetFeatures(const WebPMux* mux, uint32_t* flags) {
-  WebPData data;
-  WebPMuxError err;
+// Validates that the given mux has a single image.
+static WebPMuxError ValidateForSingleImage(const WebPMux* const mux) {
+  const int num_images = MuxImageCount(mux->images_, WEBP_CHUNK_IMAGE);
+  const int num_frames = MuxImageCount(mux->images_, WEBP_CHUNK_ANMF);
+  const int num_fragments = MuxImageCount(mux->images_, WEBP_CHUNK_FRGM);
+
+  if (num_images == 0) {
+    // No images in mux.
+    return WEBP_MUX_NOT_FOUND;
+  } else if (num_images == 1 && num_frames == 0 && num_fragments == 0) {
+    // Valid case (single image).
+    return WEBP_MUX_OK;
+  } else {
+    // Frame/Fragment case OR an invalid mux.
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+}
 
-  if (mux == NULL || flags == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-  *flags = 0;
+// Get the canvas width, height and flags after validating that VP8X/VP8/VP8L
+// chunk and canvas size are valid.
+static WebPMuxError MuxGetCanvasInfo(const WebPMux* const mux,
+                                     int* width, int* height, uint32_t* flags) {
+  int w, h;
+  uint32_t f = 0;
+  WebPData data;
+  assert(mux != NULL);
 
   // Check if VP8X chunk is present.
-  err = MuxGet(mux, IDX_VP8X, 1, &data);
-  if (err == WEBP_MUX_NOT_FOUND) {
-    // Check if VP8/VP8L chunk is present.
-    err = WebPMuxGetImage(mux, &data);
-    WebPDataClear(&data);
-    return err;
-  } else if (err != WEBP_MUX_OK) {
-    return err;
+  if (MuxGet(mux, IDX_VP8X, 1, &data) == WEBP_MUX_OK) {
+    if (data.size < VP8X_CHUNK_SIZE) return WEBP_MUX_BAD_DATA;
+    f = GetLE32(data.bytes + 0);
+    w = GetLE24(data.bytes + 4) + 1;
+    h = GetLE24(data.bytes + 7) + 1;
+  } else {
+    const WebPMuxImage* const wpi = mux->images_;
+    // Grab user-forced canvas size as default.
+    w = mux->canvas_width_;
+    h = mux->canvas_height_;
+    if (w == 0 && h == 0 && ValidateForSingleImage(mux) == WEBP_MUX_OK) {
+      // single image and not forced canvas size => use dimension of first frame
+      assert(wpi != NULL);
+      w = wpi->width_;
+      h = wpi->height_;
+    }
+    if (wpi != NULL) {
+      if (wpi->has_alpha_) f |= ALPHA_FLAG;
+    }
   }
+  if (w * (uint64_t)h >= MAX_IMAGE_AREA) return WEBP_MUX_BAD_DATA;
 
-  if (data.size_ < CHUNK_SIZE_BYTES) return WEBP_MUX_BAD_DATA;
-
-  // All OK. Fill up flags.
-  *flags = GetLE32(data.bytes_);
+  if (width != NULL) *width = w;
+  if (height != NULL) *height = h;
+  if (flags != NULL) *flags = f;
   return WEBP_MUX_OK;
 }
 
+WebPMuxError WebPMuxGetCanvasSize(const WebPMux* mux, int* width, int* height) {
+  if (mux == NULL || width == NULL || height == NULL) {
+    return WEBP_MUX_INVALID_ARGUMENT;
+  }
+  return MuxGetCanvasInfo(mux, width, height, NULL);
+}
+
+WebPMuxError WebPMuxGetFeatures(const WebPMux* mux, uint32_t* flags) {
+  if (mux == NULL || flags == NULL) return WEBP_MUX_INVALID_ARGUMENT;
+  return MuxGetCanvasInfo(mux, NULL, NULL, flags);
+}
+
 static uint8_t* EmitVP8XChunk(uint8_t* const dst, int width,
                               int height, uint32_t flags) {
   const size_t vp8x_size = CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE;
@@ -230,7 +371,7 @@ static uint8_t* EmitVP8XChunk(uint8_t* const dst, int width,
 }
 
 // Assemble a single image WebP bitstream from 'wpi'.
-static WebPMuxError SynthesizeBitstream(WebPMuxImage* const wpi,
+static WebPMuxError SynthesizeBitstream(const WebPMuxImage* const wpi,
                                         WebPData* const bitstream) {
   uint8_t* dst;
 
@@ -238,25 +379,17 @@ static WebPMuxError SynthesizeBitstream(WebPMuxImage* const wpi,
   const int need_vp8x = (wpi->alpha_ != NULL);
   const size_t vp8x_size = need_vp8x ? CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE : 0;
   const size_t alpha_size = need_vp8x ? ChunkDiskSize(wpi->alpha_) : 0;
-  // Note: No need to output FRM/TILE chunk for a single image.
+  // Note: No need to output ANMF/FRGM chunk for a single image.
   const size_t size = RIFF_HEADER_SIZE + vp8x_size + alpha_size +
                       ChunkDiskSize(wpi->img_);
-  uint8_t* const data = (uint8_t*)malloc(size);
+  uint8_t* const data = (uint8_t*)WebPSafeMalloc(1ULL, size);
   if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
 
   // Main RIFF header.
   dst = MuxEmitRiffHeader(data, size);
 
   if (need_vp8x) {
-    int w, h;
-    WebPMuxError err;
-    assert(wpi->img_ != NULL);
-    err = MuxGetImageWidthHeight(wpi->img_, &w, &h);
-    if (err != WEBP_MUX_OK) {
-      free(data);
-      return err;
-    }
-    dst = EmitVP8XChunk(dst, w, h, ALPHA_FLAG);  // VP8X.
+    dst = EmitVP8XChunk(dst, wpi->width_, wpi->height_, ALPHA_FLAG);  // VP8X.
     dst = ChunkListEmit(wpi->alpha_, dst);       // ALPH.
   }
 
@@ -265,107 +398,115 @@ static WebPMuxError SynthesizeBitstream(WebPMuxImage* const wpi,
   assert(dst == data + size);
 
   // Output.
-  bitstream->bytes_ = data;
-  bitstream->size_ = size;
+  bitstream->bytes = data;
+  bitstream->size = size;
   return WEBP_MUX_OK;
 }
 
-WebPMuxError WebPMuxGetImage(const WebPMux* mux, WebPData* bitstream) {
-  WebPMuxError err;
-  WebPMuxImage* wpi = NULL;
-
-  if (mux == NULL || bitstream == NULL) {
+WebPMuxError WebPMuxGetChunk(const WebPMux* mux, const char fourcc[4],
+                             WebPData* chunk_data) {
+  CHUNK_INDEX idx;
+  if (mux == NULL || fourcc == NULL || chunk_data == NULL) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
-
-  err = MuxValidateForImage(mux);
-  if (err != WEBP_MUX_OK) return err;
-
-  // All well. Get the image.
-  err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, WEBP_CHUNK_IMAGE,
-                       &wpi);
-  assert(err == WEBP_MUX_OK);  // Already tested above.
-
-  return SynthesizeBitstream(wpi, bitstream);
-}
-
-WebPMuxError WebPMuxGetMetadata(const WebPMux* mux, WebPData* metadata) {
-  if (mux == NULL || metadata == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-  return MuxGet(mux, IDX_META, 1, metadata);
+  idx = ChunkGetIndexFromFourCC(fourcc);
+  if (IsWPI(kChunks[idx].id)) {     // An image chunk.
+    return WEBP_MUX_INVALID_ARGUMENT;
+  } else if (idx != IDX_UNKNOWN) {  // A known chunk type.
+    return MuxGet(mux, idx, 1, chunk_data);
+  } else {                          // An unknown chunk type.
+    const WebPChunk* const chunk =
+        ChunkSearchList(mux->unknown_, 1, ChunkGetTagFromFourCC(fourcc));
+    if (chunk == NULL) return WEBP_MUX_NOT_FOUND;
+    *chunk_data = chunk->data_;
+    return WEBP_MUX_OK;
+  }
 }
 
-WebPMuxError WebPMuxGetColorProfile(const WebPMux* mux,
-                                    WebPData* color_profile) {
-  if (mux == NULL || color_profile == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-  return MuxGet(mux, IDX_ICCP, 1, color_profile);
+static WebPMuxError MuxGetImageInternal(const WebPMuxImage* const wpi,
+                                        WebPMuxFrameInfo* const info) {
+  // Set some defaults for unrelated fields.
+  info->x_offset = 0;
+  info->y_offset = 0;
+  info->duration = 1;
+  info->dispose_method = WEBP_MUX_DISPOSE_NONE;
+  info->blend_method = WEBP_MUX_BLEND;
+  // Extract data for related fields.
+  info->id = ChunkGetIdFromTag(wpi->img_->tag_);
+  return SynthesizeBitstream(wpi, &info->bitstream);
 }
 
-WebPMuxError WebPMuxGetLoopCount(const WebPMux* mux, int* loop_count) {
-  WebPData image;
-  WebPMuxError err;
-
-  if (mux == NULL || loop_count == NULL) return WEBP_MUX_INVALID_ARGUMENT;
-
-  err = MuxGet(mux, IDX_LOOP, 1, &image);
-  if (err != WEBP_MUX_OK) return err;
-  if (image.size_ < kChunks[WEBP_CHUNK_LOOP].size) return WEBP_MUX_BAD_DATA;
-  *loop_count = GetLE16(image.bytes_);
-
-  return WEBP_MUX_OK;
+static WebPMuxError MuxGetFrameFragmentInternal(const WebPMuxImage* const wpi,
+                                                WebPMuxFrameInfo* const frame) {
+  const int is_frame = (wpi->header_->tag_ == kChunks[IDX_ANMF].tag);
+  const CHUNK_INDEX idx = is_frame ? IDX_ANMF : IDX_FRGM;
+  const WebPData* frame_frgm_data;
+  if (!is_frame) return WEBP_MUX_INVALID_ARGUMENT;
+  assert(wpi->header_ != NULL);  // Already checked by WebPMuxGetFrame().
+  // Get frame/fragment chunk.
+  frame_frgm_data = &wpi->header_->data_;
+  if (frame_frgm_data->size < kChunks[idx].size) return WEBP_MUX_BAD_DATA;
+  // Extract info.
+  frame->x_offset = 2 * GetLE24(frame_frgm_data->bytes + 0);
+  frame->y_offset = 2 * GetLE24(frame_frgm_data->bytes + 3);
+  if (is_frame) {
+    const uint8_t bits = frame_frgm_data->bytes[15];
+    frame->duration = GetLE24(frame_frgm_data->bytes + 12);
+    frame->dispose_method =
+        (bits & 1) ? WEBP_MUX_DISPOSE_BACKGROUND : WEBP_MUX_DISPOSE_NONE;
+    frame->blend_method = (bits & 2) ? WEBP_MUX_NO_BLEND : WEBP_MUX_BLEND;
+  } else {  // Defaults for unused values.
+    frame->duration = 1;
+    frame->dispose_method = WEBP_MUX_DISPOSE_NONE;
+    frame->blend_method = WEBP_MUX_BLEND;
+  }
+  frame->id = ChunkGetIdFromTag(wpi->header_->tag_);
+  return SynthesizeBitstream(wpi, &frame->bitstream);
 }
 
-static WebPMuxError MuxGetFrameTileInternal(
-    const WebPMux* const mux, uint32_t nth, WebPData* const bitstream,
-    int* const x_offset, int* const y_offset, int* const duration,
-    uint32_t tag) {
-  const WebPData* frame_tile_data;
+WebPMuxError WebPMuxGetFrame(
+    const WebPMux* mux, uint32_t nth, WebPMuxFrameInfo* frame) {
   WebPMuxError err;
   WebPMuxImage* wpi;
 
-  const int is_frame = (tag == kChunks[WEBP_CHUNK_FRAME].tag) ? 1 : 0;
-  const CHUNK_INDEX idx = is_frame ? IDX_FRAME : IDX_TILE;
-  const WebPChunkId id = kChunks[idx].id;
-
-  if (mux == NULL || bitstream == NULL ||
-      x_offset == NULL || y_offset == NULL || (is_frame && duration == NULL)) {
+  // Sanity checks.
+  if (mux == NULL || frame == NULL) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }
 
   // Get the nth WebPMuxImage.
-  err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, nth, id, &wpi);
+  err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, nth, &wpi);
   if (err != WEBP_MUX_OK) return err;
 
-  // Get frame chunk.
-  assert(wpi->header_ != NULL);  // As MuxImageGetNth() already checked header_.
-  frame_tile_data = &wpi->header_->data_;
+  // Get frame info.
+  if (wpi->header_ == NULL) {
+    return MuxGetImageInternal(wpi, frame);
+  } else {
+    return MuxGetFrameFragmentInternal(wpi, frame);
+  }
+}
 
-  if (frame_tile_data->size_ < kChunks[idx].size) return WEBP_MUX_BAD_DATA;
-  *x_offset = 2 * GetLE24(frame_tile_data->bytes_ + 0);
-  *y_offset = 2 * GetLE24(frame_tile_data->bytes_ + 3);
-  if (is_frame) *duration = 1 + GetLE24(frame_tile_data->bytes_ + 12);
+WebPMuxError WebPMuxGetAnimationParams(const WebPMux* mux,
+                                       WebPMuxAnimParams* params) {
+  WebPData anim;
+  WebPMuxError err;
 
-  return SynthesizeBitstream(wpi, bitstream);
-}
+  if (mux == NULL || params == NULL) return WEBP_MUX_INVALID_ARGUMENT;
 
-WebPMuxError WebPMuxGetFrame(const WebPMux* mux, uint32_t nth,
-                             WebPData* bitstream,
-                             int* x_offset, int* y_offset, int* duration) {
-  return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset,
-                                 duration, kChunks[IDX_FRAME].tag);
-}
+  err = MuxGet(mux, IDX_ANIM, 1, &anim);
+  if (err != WEBP_MUX_OK) return err;
+  if (anim.size < kChunks[WEBP_CHUNK_ANIM].size) return WEBP_MUX_BAD_DATA;
+  params->bgcolor = GetLE32(anim.bytes);
+  params->loop_count = GetLE16(anim.bytes + 4);
 
-WebPMuxError WebPMuxGetTile(const WebPMux* mux, uint32_t nth,
-                            WebPData* bitstream,
-                            int* x_offset, int* y_offset) {
-  return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset, NULL,
-                                 kChunks[IDX_TILE].tag);
+  return WEBP_MUX_OK;
 }
 
 // Get chunk index from chunk id. Returns IDX_NIL if not found.
 static CHUNK_INDEX ChunkGetIndexFromId(WebPChunkId id) {
   int i;
   for (i = 0; kChunks[i].id != WEBP_CHUNK_NIL; ++i) {
-    if (id == kChunks[i].id) return i;
+    if (id == kChunks[i].id) return (CHUNK_INDEX)i;
   }
   return IDX_NIL;
 }
@@ -393,19 +534,11 @@ WebPMuxError WebPMuxNumChunks(const WebPMux* mux,
     *num_elements = MuxImageCount(mux->images_, id);
   } else {
     WebPChunk* const* chunk_list = MuxGetChunkListFromId(mux, id);
-    if (chunk_list == NULL) {
-      *num_elements = 0;
-    } else {
-      const CHUNK_INDEX idx = ChunkGetIndexFromId(id);
-      *num_elements = CountChunks(*chunk_list, kChunks[idx].tag);
-    }
+    const CHUNK_INDEX idx = ChunkGetIndexFromId(id);
+    *num_elements = CountChunks(*chunk_list, kChunks[idx].tag);
   }
 
   return WEBP_MUX_OK;
 }
 
 //------------------------------------------------------------------------------
-
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif