diff options
| author | Tim Redfern <tim@eclectronics.org> | 2014-02-17 13:36:38 +0000 |
|---|---|---|
| committer | Tim Redfern <tim@eclectronics.org> | 2014-02-17 13:36:38 +0000 |
| commit | 22e28216336da876e1fd17f380ce42eaf1446769 (patch) | |
| tree | 444dad3dc7e2656992d29f34f7bce31970c122a5 /ffmpeg/libavcodec/cabac_functions.h | |
| parent | ae5e8541f6e06e64c28719467cdf366ac57aff31 (diff) | |
chasing indexing error
Diffstat (limited to 'ffmpeg/libavcodec/cabac_functions.h')
| -rw-r--r-- | ffmpeg/libavcodec/cabac_functions.h | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/ffmpeg/libavcodec/cabac_functions.h b/ffmpeg/libavcodec/cabac_functions.h deleted file mode 100644 index 7e22064..0000000 --- a/ffmpeg/libavcodec/cabac_functions.h +++ /dev/null @@ -1,189 +0,0 @@ -/* - * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder - * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * Context Adaptive Binary Arithmetic Coder inline functions - */ - -#ifndef AVCODEC_CABAC_FUNCTIONS_H -#define AVCODEC_CABAC_FUNCTIONS_H - -#include <stdint.h> - -#include "cabac.h" -#include "config.h" - -#if ARCH_X86 -# include "x86/cabac.h" -#endif - -extern uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63]; -static uint8_t * const ff_h264_norm_shift = ff_h264_cabac_tables + H264_NORM_SHIFT_OFFSET; -static uint8_t * const ff_h264_lps_range = ff_h264_cabac_tables + H264_LPS_RANGE_OFFSET; -static uint8_t * const ff_h264_mlps_state = ff_h264_cabac_tables + H264_MLPS_STATE_OFFSET; -static uint8_t * const ff_h264_last_coeff_flag_offset_8x8 = ff_h264_cabac_tables + H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET; - -static void refill(CABACContext *c){ -#if CABAC_BITS == 16 - c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); -#else - c->low+= c->bytestream[0]<<1; -#endif - c->low -= CABAC_MASK; -#if !UNCHECKED_BITSTREAM_READER - if (c->bytestream < c->bytestream_end) -#endif - c->bytestream += CABAC_BITS / 8; -} - -static inline void renorm_cabac_decoder_once(CABACContext *c){ - int shift= (uint32_t)(c->range - 0x100)>>31; - c->range<<= shift; - c->low <<= shift; - if(!(c->low & CABAC_MASK)) - refill(c); -} - -#ifndef get_cabac_inline -static void refill2(CABACContext *c){ - int i, x; - - x= c->low ^ (c->low-1); - i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)]; - - x= -CABAC_MASK; - -#if CABAC_BITS == 16 - x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); -#else - x+= c->bytestream[0]<<1; -#endif - - c->low += x<<i; -#if !UNCHECKED_BITSTREAM_READER - if (c->bytestream < c->bytestream_end) -#endif - c->bytestream += CABAC_BITS/8; -} - -static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){ - int s = *state; - int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s]; - int bit, lps_mask; - - c->range -= RangeLPS; - lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31; - - c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask; - c->range += (RangeLPS - c->range) & lps_mask; - - s^=lps_mask; - *state= (ff_h264_mlps_state+128)[s]; - bit= s&1; - - lps_mask= ff_h264_norm_shift[c->range]; - c->range<<= lps_mask; - c->low <<= lps_mask; - if(!(c->low & CABAC_MASK)) - refill2(c); - return bit; -} -#endif - -static int av_noinline av_unused get_cabac_noinline(CABACContext *c, uint8_t * const state){ - return get_cabac_inline(c,state); -} - -static int av_unused get_cabac(CABACContext *c, uint8_t * const state){ - return get_cabac_inline(c,state); -} - -#ifndef get_cabac_bypass -static int av_unused get_cabac_bypass(CABACContext *c){ - int range; - c->low += c->low; - - if(!(c->low & CABAC_MASK)) - refill(c); - - range= c->range<<(CABAC_BITS+1); - if(c->low < range){ - return 0; - }else{ - c->low -= range; - return 1; - } -} -#endif - -#ifndef get_cabac_bypass_sign -static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){ - int range, mask; - c->low += c->low; - - if(!(c->low & CABAC_MASK)) - refill(c); - - range= c->range<<(CABAC_BITS+1); - c->low -= range; - mask= c->low >> 31; - range &= mask; - c->low += range; - return (val^mask)-mask; -} -#endif - -/** - * - * @return the number of bytes read or 0 if no end - */ -static int av_unused get_cabac_terminate(CABACContext *c){ - c->range -= 2; - if(c->low < c->range<<(CABAC_BITS+1)){ - renorm_cabac_decoder_once(c); - return 0; - }else{ - return c->bytestream - c->bytestream_start; - } -} - -/** - * Skip @p n bytes and reset the decoder. - * @return the address of the first skipped byte or NULL if there's less than @p n bytes left - */ -static av_unused const uint8_t* skip_bytes(CABACContext *c, int n) { - const uint8_t *ptr = c->bytestream; - - if (c->low & 0x1) - ptr--; -#if CABAC_BITS == 16 - if (c->low & 0x1FF) - ptr--; -#endif - if ((int) (c->bytestream_end - ptr) < n) - return NULL; - ff_init_cabac_decoder(c, ptr + n, c->bytestream_end - ptr - n); - - return ptr; -} - -#endif /* AVCODEC_CABAC_FUNCTIONS_H */ |
