d592f67f | /* * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * |
b78e7197 | * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or |
d592f67f | * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either |
b78e7197 | * version 2.1 of the License, or (at your option) any later version. |
d592f67f | * |
b78e7197 | * FFmpeg is distributed in the hope that it will be useful, |
d592f67f | * 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 |
b78e7197 | * License along with FFmpeg; if not, write to the Free Software |
5509bffa | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
d592f67f | */ /** |
ba87f080 | * @file |
d592f67f | * Context Adaptive Binary Arithmetic Coder. */ #include <string.h> |
245976da | #include "libavutil/common.h" |
9106a698 | #include "get_bits.h" |
d592f67f | #include "cabac.h" |
0fa352c7 | static const uint8_t lps_range[64][4]= { |
d592f67f | {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}, }; |
68a205ed | uint8_t ff_h264_mlps_state[4*64]; |
a0f2c6ba | uint8_t ff_h264_lps_range[4*2*64]; |
d61c4e73 | uint8_t ff_h264_lps_state[2*64]; uint8_t ff_h264_mps_state[2*64]; |
0fa352c7 | |
d61c4e73 | static const uint8_t mps_state[64]= { |
d592f67f | 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, }; |
d61c4e73 | static const uint8_t lps_state[64]= { |
d592f67f | 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, }; |
f24a5159 | #if 0 const uint8_t ff_h264_norm_shift_old[128]= { |
c010d69a | 7,6,5,5,4,4,4,4,3,3,3,3,3,3,3,3, |
260ceb63 | 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
ec7eb896 | 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, |
c010d69a | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
ec7eb896 | }; |
f24a5159 | #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, }; |
ec7eb896 | |
d592f67f | /** * * @param buf_size size of buf in bits */ void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size){ |
ed7debda | init_put_bits(&c->pb, buf, buf_size); |
d592f67f | c->low= 0; c->range= 0x1FE; c->outstanding_count= 0; #ifdef STRICT_LIMITS c->sym_count =0; #endif |
115329f1 | |
d592f67f | c->pb.bit_left++; //avoids firstBitFlag } /** * * @param buf_size size of buf in bits */ |
e96682e6 | void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){ |
115329f1 | c->bytestream_start= |
d592f67f | c->bytestream= buf; |
bba83349 | c->bytestream_end= buf + buf_size; |
d592f67f | |
ec7eb896 | #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; |
f24a5159 | c->range= 0x1FE; |
d592f67f | } |
d61c4e73 | void ff_init_cabac_states(CABACContext *c){ |
d592f67f | int i, j; |
115329f1 | |
d61c4e73 | for(i=0; i<64; i++){ |
d592f67f | for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save |
a0f2c6ba | ff_h264_lps_range[j*2*64+2*i+0]= ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j]; |
d592f67f | } |
68a205ed | ff_h264_mlps_state[128+2*i+0]= |
d61c4e73 | ff_h264_mps_state[2*i+0]= 2*mps_state[i]+0; |
68a205ed | ff_h264_mlps_state[128+2*i+1]= |
d61c4e73 | ff_h264_mps_state[2*i+1]= 2*mps_state[i]+1; |
d592f67f | |
e5017ab8 | if( i ){ |
db93a5a0 | ff_h264_lps_state[2*i+0]= |
68a205ed | ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0; |
db93a5a0 | ff_h264_lps_state[2*i+1]= |
68a205ed | ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1; |
2e1aee80 | }else{ |
db93a5a0 | ff_h264_lps_state[2*i+0]= |
68a205ed | ff_h264_mlps_state[128-2*i-1]= 1; |
db93a5a0 | ff_h264_lps_state[2*i+1]= |
68a205ed | ff_h264_mlps_state[128-2*i-2]= 0; |
d592f67f | } } } |
07e4e3ea | #ifdef TEST |
d592f67f | #define SIZE 10240 |
6041c217 | |
294eaa26 | #include "libavutil/lfg.h" |
6041c217 | #include "avcodec.h" |
07ad12ec | #include "cabac.h" |
6041c217 | |
f8a80fd6 | int main(void){ |
d592f67f | CABACContext c; uint8_t b[9*SIZE]; |
61ccfcc0 | uint8_t r[9*SIZE]; |
d592f67f | int i; |
61ccfcc0 | uint8_t state[10]= {0}; |
64bde197 | AVLFG prng; |
115329f1 | |
64bde197 | av_lfg_init(&prng, 1); |
d592f67f | ff_init_cabac_encoder(&c, b, SIZE); |
07ad12ec | ff_init_cabac_states(&c); |
115329f1 | |
d592f67f | for(i=0; i<SIZE; i++){ |
b2af83a9 | if(2*i<SIZE) r[i] = av_lfg_get(&prng) % 7; else r[i] = (i>>8)&1; |
d592f67f | } |
115329f1 | |
d592f67f | for(i=0; i<SIZE; i++){ START_TIMER |
61ccfcc0 | put_cabac_bypass(&c, r[i]&1); |
d592f67f | STOP_TIMER("put_cabac_bypass") } |
115329f1 | |
d592f67f | for(i=0; i<SIZE; i++){ START_TIMER |
61ccfcc0 | put_cabac(&c, state, r[i]&1); |
d592f67f | STOP_TIMER("put_cabac") } |
f38b2a6b | #if 0 |
61ccfcc0 | for(i=0; i<SIZE; i++){ START_TIMER put_cabac_u(&c, state, r[i], 6, 3, i&1); STOP_TIMER("put_cabac_u") |
115329f1 | } |
61ccfcc0 | for(i=0; i<SIZE; i++){ START_TIMER |
8f8c0800 | put_cabac_ueg(&c, state, r[i], 3, 0, 1, 2); |
61ccfcc0 | STOP_TIMER("put_cabac_ueg") |
115329f1 | } |
f38b2a6b | #endif |
d592f67f | put_cabac_terminate(&c, 1); |
115329f1 | |
d592f67f | ff_init_cabac_decoder(&c, b, SIZE); |
115329f1 | |
61ccfcc0 | memset(state, 0, sizeof(state)); |
115329f1 | |
d592f67f | for(i=0; i<SIZE; i++){ START_TIMER |
61ccfcc0 | if( (r[i]&1) != get_cabac_bypass(&c) ) |
6041c217 | av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i); |
d592f67f | STOP_TIMER("get_cabac_bypass") } |
115329f1 | |
d592f67f | for(i=0; i<SIZE; i++){ START_TIMER |
61ccfcc0 | if( (r[i]&1) != get_cabac(&c, state) ) |
6041c217 | av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i); |
d592f67f | STOP_TIMER("get_cabac") } |
6041c217 | #if 0 |
61ccfcc0 | for(i=0; i<SIZE; i++){ START_TIMER if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) ) |
6041c217 | av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i); |
61ccfcc0 | 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)) |
6041c217 | av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i); |
61ccfcc0 | STOP_TIMER("get_cabac_ueg") } |
6041c217 | #endif |
d592f67f | if(!get_cabac_terminate(&c)) |
6041c217 | av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n"); |
115329f1 | |
d592f67f | return 0; } |
07e4e3ea | #endif /* TEST */ |