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Diffstat (limited to 'drivers/webpold/utils/bit_writer.h')
-rw-r--r-- | drivers/webpold/utils/bit_writer.h | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/drivers/webpold/utils/bit_writer.h b/drivers/webpold/utils/bit_writer.h deleted file mode 100644 index 57f39b11b1..0000000000 --- a/drivers/webpold/utils/bit_writer.h +++ /dev/null @@ -1,123 +0,0 @@ -// 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/ -// ----------------------------------------------------------------------------- -// -// Bit writing and boolean coder -// -// Author: Skal (pascal.massimino@gmail.com) - -#ifndef WEBP_UTILS_BIT_WRITER_H_ -#define WEBP_UTILS_BIT_WRITER_H_ - -#include "../types.h" - -#if defined(__cplusplus) || defined(c_plusplus) -extern "C" { -#endif - -//------------------------------------------------------------------------------ -// Bit-writing - -typedef struct VP8BitWriter VP8BitWriter; -struct VP8BitWriter { - int32_t range_; // range-1 - int32_t value_; - int run_; // number of outstanding bits - int nb_bits_; // number of pending bits - uint8_t* buf_; // internal buffer. Re-allocated regularly. Not owned. - size_t pos_; - size_t max_pos_; - int error_; // true in case of error -}; - -// Initialize the object. Allocates some initial memory based on expected_size. -int VP8BitWriterInit(VP8BitWriter* const bw, size_t expected_size); -// Finalize the bitstream coding. Returns a pointer to the internal buffer. -uint8_t* VP8BitWriterFinish(VP8BitWriter* const bw); -// Release any pending memory and zeroes the object. Not a mandatory call. -// Only useful in case of error, when the internal buffer hasn't been grabbed! -void VP8BitWriterWipeOut(VP8BitWriter* const bw); - -int VP8PutBit(VP8BitWriter* const bw, int bit, int prob); -int VP8PutBitUniform(VP8BitWriter* const bw, int bit); -void VP8PutValue(VP8BitWriter* const bw, int value, int nb_bits); -void VP8PutSignedValue(VP8BitWriter* const bw, int value, int nb_bits); - -// Appends some bytes to the internal buffer. Data is copied. -int VP8BitWriterAppend(VP8BitWriter* const bw, - const uint8_t* data, size_t size); - -// return approximate write position (in bits) -static WEBP_INLINE uint64_t VP8BitWriterPos(const VP8BitWriter* const bw) { - return (uint64_t)(bw->pos_ + bw->run_) * 8 + 8 + bw->nb_bits_; -} - -// Returns a pointer to the internal buffer. -static WEBP_INLINE uint8_t* VP8BitWriterBuf(const VP8BitWriter* const bw) { - return bw->buf_; -} -// Returns the size of the internal buffer. -static WEBP_INLINE size_t VP8BitWriterSize(const VP8BitWriter* const bw) { - return bw->pos_; -} - -//------------------------------------------------------------------------------ -// VP8LBitWriter -// TODO(vikasa): VP8LBitWriter is copied as-is from lossless code. There's scope -// of re-using VP8BitWriter. Will evaluate once basic lossless encoder is -// implemented. - -typedef struct { - uint8_t* buf_; - size_t bit_pos_; - size_t max_bytes_; - - // After all bits are written, the caller must observe the state of - // error_. A value of 1 indicates that a memory allocation failure - // has happened during bit writing. A value of 0 indicates successful - // writing of bits. - int error_; -} VP8LBitWriter; - -static WEBP_INLINE size_t VP8LBitWriterNumBytes(VP8LBitWriter* const bw) { - return (bw->bit_pos_ + 7) >> 3; -} - -static WEBP_INLINE uint8_t* VP8LBitWriterFinish(VP8LBitWriter* const bw) { - return bw->buf_; -} - -// Returns 0 in case of memory allocation error. -int VP8LBitWriterInit(VP8LBitWriter* const bw, size_t expected_size); - -void VP8LBitWriterDestroy(VP8LBitWriter* const bw); - -// This function writes bits into bytes in increasing addresses, and within -// a byte least-significant-bit first. -// -// The function can write up to 16 bits in one go with WriteBits -// Example: let's assume that 3 bits (Rs below) have been written already: -// -// BYTE-0 BYTE+1 BYTE+2 -// -// 0000 0RRR 0000 0000 0000 0000 -// -// Now, we could write 5 or less bits in MSB by just sifting by 3 -// and OR'ing to BYTE-0. -// -// For n bits, we take the last 5 bytes, OR that with high bits in BYTE-0, -// and locate the rest in BYTE+1 and BYTE+2. -// -// VP8LBitWriter's error_ flag is set in case of memory allocation error. -void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits); - -//------------------------------------------------------------------------------ - -#if defined(__cplusplus) || defined(c_plusplus) -} // extern "C" -#endif - -#endif /* WEBP_UTILS_BIT_WRITER_H_ */ |