yading@10: /* yading@10: * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder yading@10: * Copyright (c) 2003 Michael Niedermayer yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * Context Adaptive Binary Arithmetic Coder. yading@10: */ yading@10: yading@10: #include yading@10: yading@10: #include "libavutil/common.h" yading@10: #include "get_bits.h" yading@10: #include "cabac.h" yading@10: #include "cabac_functions.h" yading@10: yading@10: uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63] = { yading@10: 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5, yading@10: 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, yading@10: 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, yading@10: 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, yading@10: 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, yading@10: 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, yading@10: 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, yading@10: 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, yading@10: 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, yading@10: 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, yading@10: 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, yading@10: 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, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, yading@10: }; yading@10: yading@10: static const uint8_t lps_range[64][4]= { yading@10: {128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205}, yading@10: {116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166}, yading@10: { 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135}, yading@10: { 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110}, yading@10: { 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89}, yading@10: { 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72}, yading@10: { 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59}, yading@10: { 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48}, yading@10: { 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39}, yading@10: { 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31}, yading@10: { 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25}, yading@10: { 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21}, yading@10: { 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17}, yading@10: { 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14}, yading@10: { 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11}, yading@10: { 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2}, yading@10: }; yading@10: yading@10: static uint8_t h264_lps_state[2*64]; yading@10: static uint8_t h264_mps_state[2*64]; yading@10: yading@10: static const uint8_t mps_state[64]= { yading@10: 1, 2, 3, 4, 5, 6, 7, 8, yading@10: 9,10,11,12,13,14,15,16, yading@10: 17,18,19,20,21,22,23,24, yading@10: 25,26,27,28,29,30,31,32, yading@10: 33,34,35,36,37,38,39,40, yading@10: 41,42,43,44,45,46,47,48, yading@10: 49,50,51,52,53,54,55,56, yading@10: 57,58,59,60,61,62,62,63, yading@10: }; yading@10: yading@10: static const uint8_t lps_state[64]= { yading@10: 0, 0, 1, 2, 2, 4, 4, 5, yading@10: 6, 7, 8, 9, 9,11,11,12, yading@10: 13,13,15,15,16,16,18,18, yading@10: 19,19,21,21,22,22,23,24, yading@10: 24,25,26,26,27,27,28,29, yading@10: 29,30,30,30,31,32,32,33, yading@10: 33,33,34,34,35,35,35,36, yading@10: 36,36,37,37,37,38,38,63, yading@10: }; yading@10: yading@10: static const uint8_t last_coeff_flag_offset_8x8[63] = { yading@10: 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, yading@10: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, yading@10: 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, yading@10: 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8 yading@10: }; yading@10: yading@10: /** yading@10: * yading@10: * @param buf_size size of buf in bits yading@10: */ yading@10: void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size){ yading@10: init_put_bits(&c->pb, buf, buf_size); yading@10: yading@10: c->low= 0; yading@10: c->range= 0x1FE; yading@10: c->outstanding_count= 0; yading@10: c->pb.bit_left++; //avoids firstBitFlag yading@10: } yading@10: yading@10: /** yading@10: * yading@10: * @param buf_size size of buf in bits yading@10: */ yading@10: void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){ yading@10: c->bytestream_start= yading@10: c->bytestream= buf; yading@10: c->bytestream_end= buf + buf_size; yading@10: yading@10: #if CABAC_BITS == 16 yading@10: c->low = (*c->bytestream++)<<18; yading@10: c->low+= (*c->bytestream++)<<10; yading@10: #else yading@10: c->low = (*c->bytestream++)<<10; yading@10: #endif yading@10: c->low+= ((*c->bytestream++)<<2) + 2; yading@10: c->range= 0x1FE; yading@10: } yading@10: yading@10: void ff_init_cabac_states(void) yading@10: { yading@10: int i, j; yading@10: yading@10: for(i=0; i<64; i++){ yading@10: for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save yading@10: ff_h264_lps_range[j*2*64+2*i+0]= yading@10: ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j]; yading@10: } yading@10: yading@10: ff_h264_mlps_state[128+2*i+0]= yading@10: h264_mps_state[2 * i + 0] = 2 * mps_state[i] + 0; yading@10: ff_h264_mlps_state[128+2*i+1]= yading@10: h264_mps_state[2 * i + 1] = 2 * mps_state[i] + 1; yading@10: yading@10: if( i ){ yading@10: h264_lps_state[2*i+0]= yading@10: ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0; yading@10: h264_lps_state[2*i+1]= yading@10: ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1; yading@10: }else{ yading@10: h264_lps_state[2*i+0]= yading@10: ff_h264_mlps_state[128-2*i-1]= 1; yading@10: h264_lps_state[2*i+1]= yading@10: ff_h264_mlps_state[128-2*i-2]= 0; yading@10: } yading@10: } yading@10: for(i=0; i< 63; i++){ yading@10: ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i]; yading@10: } yading@10: } yading@10: yading@10: #ifdef TEST yading@10: #define SIZE 10240 yading@10: yading@10: #include "libavutil/lfg.h" yading@10: #include "avcodec.h" yading@10: #include "cabac.h" yading@10: yading@10: static inline void put_cabac_bit(CABACContext *c, int b){ yading@10: put_bits(&c->pb, 1, b); yading@10: for(;c->outstanding_count; c->outstanding_count--){ yading@10: put_bits(&c->pb, 1, 1-b); yading@10: } yading@10: } yading@10: yading@10: static inline void renorm_cabac_encoder(CABACContext *c){ yading@10: while(c->range < 0x100){ yading@10: //FIXME optimize yading@10: if(c->low<0x100){ yading@10: put_cabac_bit(c, 0); yading@10: }else if(c->low<0x200){ yading@10: c->outstanding_count++; yading@10: c->low -= 0x100; yading@10: }else{ yading@10: put_cabac_bit(c, 1); yading@10: c->low -= 0x200; yading@10: } yading@10: yading@10: c->range+= c->range; yading@10: c->low += c->low; yading@10: } yading@10: } yading@10: yading@10: static void put_cabac(CABACContext *c, uint8_t * const state, int bit){ yading@10: int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state]; yading@10: yading@10: if(bit == ((*state)&1)){ yading@10: c->range -= RangeLPS; yading@10: *state = h264_mps_state[*state]; yading@10: }else{ yading@10: c->low += c->range - RangeLPS; yading@10: c->range = RangeLPS; yading@10: *state= h264_lps_state[*state]; yading@10: } yading@10: yading@10: renorm_cabac_encoder(c); yading@10: } yading@10: yading@10: /** yading@10: * @param bit 0 -> write zero bit, !=0 write one bit yading@10: */ yading@10: static void put_cabac_bypass(CABACContext *c, int bit){ yading@10: c->low += c->low; yading@10: yading@10: if(bit){ yading@10: c->low += c->range; yading@10: } yading@10: //FIXME optimize yading@10: if(c->low<0x200){ yading@10: put_cabac_bit(c, 0); yading@10: }else if(c->low<0x400){ yading@10: c->outstanding_count++; yading@10: c->low -= 0x200; yading@10: }else{ yading@10: put_cabac_bit(c, 1); yading@10: c->low -= 0x400; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * yading@10: * @return the number of bytes written yading@10: */ yading@10: static int put_cabac_terminate(CABACContext *c, int bit){ yading@10: c->range -= 2; yading@10: yading@10: if(!bit){ yading@10: renorm_cabac_encoder(c); yading@10: }else{ yading@10: c->low += c->range; yading@10: c->range= 2; yading@10: yading@10: renorm_cabac_encoder(c); yading@10: yading@10: av_assert0(c->low <= 0x1FF); yading@10: put_cabac_bit(c, c->low>>9); yading@10: put_bits(&c->pb, 2, ((c->low>>7)&3)|1); yading@10: yading@10: flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong yading@10: } yading@10: yading@10: return (put_bits_count(&c->pb)+7)>>3; yading@10: } yading@10: yading@10: int main(void){ yading@10: CABACContext c; yading@10: uint8_t b[9*SIZE]; yading@10: uint8_t r[9*SIZE]; yading@10: int i; yading@10: uint8_t state[10]= {0}; yading@10: AVLFG prng; yading@10: yading@10: av_lfg_init(&prng, 1); yading@10: ff_init_cabac_encoder(&c, b, SIZE); yading@10: ff_init_cabac_states(); yading@10: yading@10: for(i=0; i>8)&1; yading@10: } yading@10: yading@10: for(i=0; i