2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Context Adaptive Binary Arithmetic Coder.
31 const uint8_t ff_h264_lps_range[64][4]= {
32 {128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205},
33 {116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166},
34 { 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135},
35 { 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110},
36 { 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89},
37 { 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72},
38 { 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59},
39 { 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48},
40 { 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39},
41 { 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31},
42 { 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25},
43 { 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21},
44 { 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17},
45 { 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14},
46 { 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11},
47 { 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
50 const uint8_t ff_h264_mps_state[64]= {
51 1, 2, 3, 4, 5, 6, 7, 8,
52 9,10,11,12,13,14,15,16,
53 17,18,19,20,21,22,23,24,
54 25,26,27,28,29,30,31,32,
55 33,34,35,36,37,38,39,40,
56 41,42,43,44,45,46,47,48,
57 49,50,51,52,53,54,55,56,
58 57,58,59,60,61,62,62,63,
61 const uint8_t ff_h264_lps_state[64]= {
62 0, 0, 1, 2, 2, 4, 4, 5,
63 6, 7, 8, 9, 9,11,11,12,
64 13,13,15,15,16,16,18,18,
65 19,19,21,21,22,22,23,24,
66 24,25,26,26,27,27,28,29,
67 29,30,30,30,31,32,32,33,
68 33,33,34,34,35,35,35,36,
69 36,36,37,37,37,38,38,63,
74 * @param buf_size size of buf in bits
76 void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size){
77 init_put_bits(&c->pb, buf, buf_size, NULL, NULL);
81 c->outstanding_count= 0;
86 c->pb.bit_left++; //avoids firstBitFlag
91 * @param buf_size size of buf in bits
93 void ff_init_cabac_decoder(CABACContext *c, uint8_t *buf, int buf_size){
97 c->low= *c->bytestream++;
98 c->low= (c->low<<9) + ((*c->bytestream++)<<1);
103 void ff_init_cabac_states(CABACContext *c, uint8_t const (*lps_range)[4],
104 uint8_t const *mps_state, uint8_t const *lps_state, int state_count){
107 for(i=0; i<state_count; i++){
108 for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
109 c->lps_range[2*i+0][j]=
110 c->lps_range[2*i+1][j]= lps_range[i][j];
113 c->mps_state[2*i+0]= 2*mps_state[i];
114 c->mps_state[2*i+1]= 2*mps_state[i]+1;
117 c->lps_state[2*i+0]= 2*lps_state[i];
118 c->lps_state[2*i+1]= 2*lps_state[i]+1;
120 c->lps_state[2*i+0]= 1;
121 c->lps_state[2*i+1]= 0;
133 uint8_t state[10]= {0};
135 ff_init_cabac_encoder(&c, b, SIZE);
136 ff_init_cabac_states(&c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
138 for(i=0; i<SIZE; i++){
142 for(i=0; i<SIZE; i++){
144 put_cabac_bypass(&c, r[i]&1);
145 STOP_TIMER("put_cabac_bypass")
148 for(i=0; i<SIZE; i++){
150 put_cabac(&c, state, r[i]&1);
151 STOP_TIMER("put_cabac")
154 for(i=0; i<SIZE; i++){
156 put_cabac_u(&c, state, r[i], 6, 3, i&1);
157 STOP_TIMER("put_cabac_u")
160 for(i=0; i<SIZE; i++){
162 put_cabac_ueg(&c, state, r[i], 3, 0, 1, 2);
163 STOP_TIMER("put_cabac_ueg")
166 put_cabac_terminate(&c, 1);
168 ff_init_cabac_decoder(&c, b, SIZE);
170 memset(state, 0, sizeof(state));
172 for(i=0; i<SIZE; i++){
174 if( (r[i]&1) != get_cabac_bypass(&c) )
175 printf("CABAC bypass failure at %d\n", i);
176 STOP_TIMER("get_cabac_bypass")
179 for(i=0; i<SIZE; i++){
181 if( (r[i]&1) != get_cabac(&c, state) )
182 printf("CABAC failure at %d\n", i);
183 STOP_TIMER("get_cabac")
186 for(i=0; i<SIZE; i++){
188 if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) )
189 printf("CABAC unary (truncated) binarization failure at %d\n", i);
190 STOP_TIMER("get_cabac_u")
193 for(i=0; i<SIZE; i++){
195 if( r[i] != get_cabac_ueg(&c, state, 3, 0, 1, 2))
196 printf("CABAC unary (truncated) binarization failure at %d\n", i);
197 STOP_TIMER("get_cabac_ueg")
200 if(!get_cabac_terminate(&c))
201 printf("where's the Terminator?\n");