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Diffstat (limited to 'contrib/ffmpeg/libavcodec/cabac.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/cabac.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/cabac.c b/contrib/ffmpeg/libavcodec/cabac.c new file mode 100644 index 000000000..c6da6292a --- /dev/null +++ b/contrib/ffmpeg/libavcodec/cabac.c @@ -0,0 +1,265 @@ +/* + * 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 cabac.c + * Context Adaptive Binary Arithmetic Coder. + */ + +#include <string.h> + +#include "common.h" +#include "bitstream.h" +#include "cabac.h" + +static const uint8_t lps_range[64][4]= { +{128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205}, +{116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166}, +{ 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135}, +{ 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110}, +{ 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89}, +{ 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72}, +{ 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59}, +{ 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48}, +{ 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39}, +{ 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31}, +{ 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25}, +{ 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21}, +{ 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17}, +{ 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14}, +{ 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11}, +{ 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2}, +}; + +uint8_t ff_h264_mlps_state[4*64]; +uint8_t ff_h264_lps_range[4*2*64]; +uint8_t ff_h264_lps_state[2*64]; +uint8_t ff_h264_mps_state[2*64]; + +static const uint8_t mps_state[64]= { + 1, 2, 3, 4, 5, 6, 7, 8, + 9,10,11,12,13,14,15,16, + 17,18,19,20,21,22,23,24, + 25,26,27,28,29,30,31,32, + 33,34,35,36,37,38,39,40, + 41,42,43,44,45,46,47,48, + 49,50,51,52,53,54,55,56, + 57,58,59,60,61,62,62,63, +}; + +static const uint8_t lps_state[64]= { + 0, 0, 1, 2, 2, 4, 4, 5, + 6, 7, 8, 9, 9,11,11,12, + 13,13,15,15,16,16,18,18, + 19,19,21,21,22,22,23,24, + 24,25,26,26,27,27,28,29, + 29,30,30,30,31,32,32,33, + 33,33,34,34,35,35,35,36, + 36,36,37,37,37,38,38,63, +}; +#if 0 +const uint8_t ff_h264_norm_shift_old[128]= { + 7,6,5,5,4,4,4,4,3,3,3,3,3,3,3,3, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +}; +#endif +const uint8_t ff_h264_norm_shift[512]= { + 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5, + 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, + 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, + 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +}; + +/** + * + * @param buf_size size of buf in bits + */ +void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size){ + init_put_bits(&c->pb, buf, buf_size); + + c->low= 0; + c->range= 0x1FE; + c->outstanding_count= 0; +#ifdef STRICT_LIMITS + c->sym_count =0; +#endif + + c->pb.bit_left++; //avoids firstBitFlag +} + +/** + * + * @param buf_size size of buf in bits + */ +void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){ + c->bytestream_start= + c->bytestream= buf; + c->bytestream_end= buf + buf_size; + +#if CABAC_BITS == 16 + c->low = (*c->bytestream++)<<18; + c->low+= (*c->bytestream++)<<10; +#else + c->low = (*c->bytestream++)<<10; +#endif + c->low+= ((*c->bytestream++)<<2) + 2; + c->range= 0x1FE; +} + +void ff_init_cabac_states(CABACContext *c){ + int i, j; + + for(i=0; i<64; i++){ + for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save + ff_h264_lps_range[j*2*64+2*i+0]= + ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j]; + } + + ff_h264_mlps_state[128+2*i+0]= + ff_h264_mps_state[2*i+0]= 2*mps_state[i]+0; + ff_h264_mlps_state[128+2*i+1]= + ff_h264_mps_state[2*i+1]= 2*mps_state[i]+1; + + if( i ){ +#ifdef BRANCHLESS_CABAC_DECODER + ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0; + ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1; + }else{ + ff_h264_mlps_state[128-2*i-1]= 1; + ff_h264_mlps_state[128-2*i-2]= 0; +#else + ff_h264_lps_state[2*i+0]= 2*lps_state[i]+0; + ff_h264_lps_state[2*i+1]= 2*lps_state[i]+1; + }else{ + ff_h264_lps_state[2*i+0]= 1; + ff_h264_lps_state[2*i+1]= 0; +#endif + } + } +} + +#if 0 //selftest +#define SIZE 10240 + +#include "avcodec.h" + +int main(){ + CABACContext c; + uint8_t b[9*SIZE]; + uint8_t r[9*SIZE]; + int i; + uint8_t state[10]= {0}; + + ff_init_cabac_encoder(&c, b, SIZE); + ff_init_cabac_states(&c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64); + + for(i=0; i<SIZE; i++){ + r[i]= random()%7; + } + + for(i=0; i<SIZE; i++){ +START_TIMER + put_cabac_bypass(&c, r[i]&1); +STOP_TIMER("put_cabac_bypass") + } + + for(i=0; i<SIZE; i++){ +START_TIMER + put_cabac(&c, state, r[i]&1); +STOP_TIMER("put_cabac") + } + + for(i=0; i<SIZE; i++){ +START_TIMER + put_cabac_u(&c, state, r[i], 6, 3, i&1); +STOP_TIMER("put_cabac_u") + } + + for(i=0; i<SIZE; i++){ +START_TIMER + put_cabac_ueg(&c, state, r[i], 3, 0, 1, 2); +STOP_TIMER("put_cabac_ueg") + } + + put_cabac_terminate(&c, 1); + + ff_init_cabac_decoder(&c, b, SIZE); + + memset(state, 0, sizeof(state)); + + for(i=0; i<SIZE; i++){ +START_TIMER + if( (r[i]&1) != get_cabac_bypass(&c) ) + av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i); +STOP_TIMER("get_cabac_bypass") + } + + for(i=0; i<SIZE; i++){ +START_TIMER + if( (r[i]&1) != get_cabac(&c, state) ) + av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i); +STOP_TIMER("get_cabac") + } +#if 0 + for(i=0; i<SIZE; i++){ +START_TIMER + if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) ) + av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i); +STOP_TIMER("get_cabac_u") + } + + for(i=0; i<SIZE; i++){ +START_TIMER + if( r[i] != get_cabac_ueg(&c, state, 3, 0, 1, 2)) + av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i); +STOP_TIMER("get_cabac_ueg") + } +#endif + if(!get_cabac_terminate(&c)) + av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n"); + + return 0; +} + +#endif |