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Diffstat (limited to 'thirdparty/libvpx/vp8/decoder/dboolhuff.h')
| -rw-r--r-- | thirdparty/libvpx/vp8/decoder/dboolhuff.h | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/thirdparty/libvpx/vp8/decoder/dboolhuff.h b/thirdparty/libvpx/vp8/decoder/dboolhuff.h deleted file mode 100644 index 1b1bbf868e..0000000000 --- a/thirdparty/libvpx/vp8/decoder/dboolhuff.h +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (c) 2010 The WebM project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE 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. - */ - - -#ifndef VP8_DECODER_DBOOLHUFF_H_ -#define VP8_DECODER_DBOOLHUFF_H_ - -#include <stddef.h> -#include <limits.h> - -#include "./vpx_config.h" -#include "vpx_ports/mem.h" -#include "vpx/vp8dx.h" -#include "vpx/vpx_integer.h" - -#ifdef __cplusplus -extern "C" { -#endif - -typedef size_t VP8_BD_VALUE; - -#define VP8_BD_VALUE_SIZE ((int)sizeof(VP8_BD_VALUE)*CHAR_BIT) - -/*This is meant to be a large, positive constant that can still be efficiently - loaded as an immediate (on platforms like ARM, for example). - Even relatively modest values like 100 would work fine.*/ -#define VP8_LOTS_OF_BITS (0x40000000) - -typedef struct -{ - const unsigned char *user_buffer_end; - const unsigned char *user_buffer; - VP8_BD_VALUE value; - int count; - unsigned int range; - vpx_decrypt_cb decrypt_cb; - void *decrypt_state; -} BOOL_DECODER; - -DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]); - -int vp8dx_start_decode(BOOL_DECODER *br, - const unsigned char *source, - unsigned int source_sz, - vpx_decrypt_cb decrypt_cb, - void *decrypt_state); - -void vp8dx_bool_decoder_fill(BOOL_DECODER *br); - - -static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) { - unsigned int bit = 0; - VP8_BD_VALUE value; - unsigned int split; - VP8_BD_VALUE bigsplit; - int count; - unsigned int range; - - split = 1 + (((br->range - 1) * probability) >> 8); - - if(br->count < 0) - vp8dx_bool_decoder_fill(br); - - value = br->value; - count = br->count; - - bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8); - - range = split; - - if (value >= bigsplit) - { - range = br->range - split; - value = value - bigsplit; - bit = 1; - } - - { - register int shift = vp8_norm[range]; - range <<= shift; - value <<= shift; - count -= shift; - } - br->value = value; - br->count = count; - br->range = range; - - return bit; -} - -static INLINE int vp8_decode_value(BOOL_DECODER *br, int bits) -{ - int z = 0; - int bit; - - for (bit = bits - 1; bit >= 0; bit--) - { - z |= (vp8dx_decode_bool(br, 0x80) << bit); - } - - return z; -} - -static INLINE int vp8dx_bool_error(BOOL_DECODER *br) -{ - /* Check if we have reached the end of the buffer. - * - * Variable 'count' stores the number of bits in the 'value' buffer, minus - * 8. The top byte is part of the algorithm, and the remainder is buffered - * to be shifted into it. So if count == 8, the top 16 bits of 'value' are - * occupied, 8 for the algorithm and 8 in the buffer. - * - * When reading a byte from the user's buffer, count is filled with 8 and - * one byte is filled into the value buffer. When we reach the end of the - * data, count is additionally filled with VP8_LOTS_OF_BITS. So when - * count == VP8_LOTS_OF_BITS - 1, the user's data has been exhausted. - */ - if ((br->count > VP8_BD_VALUE_SIZE) && (br->count < VP8_LOTS_OF_BITS)) - { - /* We have tried to decode bits after the end of - * stream was encountered. - */ - return 1; - } - - /* No error. */ - return 0; -} - -#ifdef __cplusplus -} // extern "C" -#endif - -#endif // VP8_DECODER_DBOOLHUFF_H_ |