* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/cabac.c
+ * @file
* Context Adaptive Binary Arithmetic Coder.
*/
#include <string.h>
#include "libavutil/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,
+#include "cabac.h"
+#include "cabac_functions.h"
+
+const uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63] = {
+ 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,
+ // LPS range
+ -128, -128, -128, -128, -128, -128, 123, 123,
+ 116, 116, 111, 111, 105, 105, 100, 100,
+ 95, 95, 90, 90, 85, 85, 81, 81,
+ 77, 77, 73, 73, 69, 69, 66, 66,
+ 62, 62, 59, 59, 56, 56, 53, 53,
+ 51, 51, 48, 48, 46, 46, 43, 43,
+ 41, 41, 39, 39, 37, 37, 35, 35,
+ 33, 33, 32, 32, 30, 30, 29, 29,
+ 27, 27, 26, 26, 24, 24, 23, 23,
+ 22, 22, 21, 21, 20, 20, 19, 19,
+ 18, 18, 17, 17, 16, 16, 15, 15,
+ 14, 14, 14, 14, 13, 13, 12, 12,
+ 12, 12, 11, 11, 11, 11, 10, 10,
+ 10, 10, 9, 9, 9, 9, 8, 8,
+ 8, 8, 7, 7, 7, 7, 7, 7,
+ 6, 6, 6, 6, 6, 6, 2, 2,
+ -80, -80, -89, -89, -98, -98, -106, -106,
+ -114, -114, -121, -121, -128, -128, 122, 122,
+ 116, 116, 110, 110, 104, 104, 99, 99,
+ 94, 94, 89, 89, 85, 85, 80, 80,
+ 76, 76, 72, 72, 69, 69, 65, 65,
+ 62, 62, 59, 59, 56, 56, 53, 53,
+ 50, 50, 48, 48, 45, 45, 43, 43,
+ 41, 41, 39, 39, 37, 37, 35, 35,
+ 33, 33, 31, 31, 30, 30, 28, 28,
+ 27, 27, 26, 26, 24, 24, 23, 23,
+ 22, 22, 21, 21, 20, 20, 19, 19,
+ 18, 18, 17, 17, 16, 16, 15, 15,
+ 14, 14, 14, 14, 13, 13, 12, 12,
+ 12, 12, 11, 11, 11, 11, 10, 10,
+ 9, 9, 9, 9, 9, 9, 8, 8,
+ 8, 8, 7, 7, 7, 7, 2, 2,
+ -48, -48, -59, -59, -69, -69, -78, -78,
+ -87, -87, -96, -96, -104, -104, -112, -112,
+ -119, -119, -126, -126, 123, 123, 117, 117,
+ 111, 111, 105, 105, 100, 100, 95, 95,
+ 90, 90, 86, 86, 81, 81, 77, 77,
+ 73, 73, 69, 69, 66, 66, 63, 63,
+ 59, 59, 56, 56, 54, 54, 51, 51,
+ 48, 48, 46, 46, 43, 43, 41, 41,
+ 39, 39, 37, 37, 35, 35, 33, 33,
+ 32, 32, 30, 30, 29, 29, 27, 27,
+ 26, 26, 25, 25, 23, 23, 22, 22,
+ 21, 21, 20, 20, 19, 19, 18, 18,
+ 17, 17, 16, 16, 15, 15, 15, 15,
+ 14, 14, 13, 13, 12, 12, 12, 12,
+ 11, 11, 11, 11, 10, 10, 10, 10,
+ 9, 9, 9, 9, 8, 8, 2, 2,
+ -16, -16, -29, -29, -40, -40, -51, -51,
+ -61, -61, -71, -71, -81, -81, -90, -90,
+ -98, -98, -106, -106, -114, -114, -121, -121,
+ -128, -128, 122, 122, 116, 116, 110, 110,
+ 104, 104, 99, 99, 94, 94, 89, 89,
+ 85, 85, 80, 80, 76, 76, 72, 72,
+ 69, 69, 65, 65, 62, 62, 59, 59,
+ 56, 56, 53, 53, 50, 50, 48, 48,
+ 45, 45, 43, 43, 41, 41, 39, 39,
+ 37, 37, 35, 35, 33, 33, 31, 31,
+ 30, 30, 28, 28, 27, 27, 25, 25,
+ 24, 24, 23, 23, 22, 22, 21, 21,
+ 20, 20, 19, 19, 18, 18, 17, 17,
+ 16, 16, 15, 15, 14, 14, 14, 14,
+ 13, 13, 12, 12, 12, 12, 11, 11,
+ 11, 11, 10, 10, 9, 9, 2, 2,
+ // mlps state
+ 127, 126, 77, 76, 77, 76, 75, 74,
+ 75, 74, 75, 74, 73, 72, 73, 72,
+ 73, 72, 71, 70, 71, 70, 71, 70,
+ 69, 68, 69, 68, 67, 66, 67, 66,
+ 67, 66, 65, 64, 65, 64, 63, 62,
+ 61, 60, 61, 60, 61, 60, 59, 58,
+ 59, 58, 57, 56, 55, 54, 55, 54,
+ 53, 52, 53, 52, 51, 50, 49, 48,
+ 49, 48, 47, 46, 45, 44, 45, 44,
+ 43, 42, 43, 42, 39, 38, 39, 38,
+ 37, 36, 37, 36, 33, 32, 33, 32,
+ 31, 30, 31, 30, 27, 26, 27, 26,
+ 25, 24, 23, 22, 23, 22, 19, 18,
+ 19, 18, 17, 16, 15, 14, 13, 12,
+ 11, 10, 9, 8, 9, 8, 5, 4,
+ 5, 4, 3, 2, 1, 0, 0, 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, 63, 64, 65,
+ 66, 67, 68, 69, 70, 71, 72, 73,
+ 74, 75, 76, 77, 78, 79, 80, 81,
+ 82, 83, 84, 85, 86, 87, 88, 89,
+ 90, 91, 92, 93, 94, 95, 96, 97,
+ 98, 99, 100, 101, 102, 103, 104, 105,
+ 106, 107, 108, 109, 110, 111, 112, 113,
+ 114, 115, 116, 117, 118, 119, 120, 121,
+ 122, 123, 124, 125, 124, 125, 126, 127,
+ // last_coeff_flag_offset_8x8
+ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
+ 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
};
/**
- *
- * @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->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
- }
- }
-}
-
-#ifdef TEST
-#define SIZE 10240
-
-#include "libavutil/lfg.h"
-#include "avcodec.h"
-#include "cabac.h"
-
-int main(void){
- CABACContext c;
- uint8_t b[9*SIZE];
- uint8_t r[9*SIZE];
- int i;
- uint8_t state[10]= {0};
- AVLFG prng;
-
- av_lfg_init(&prng, 1);
- ff_init_cabac_encoder(&c, b, SIZE);
- ff_init_cabac_states(&c);
-
- for(i=0; i<SIZE; i++){
- r[i] = av_lfg_get(&prng) % 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 /* TEST */