Mercurial > cgi-bin > hgwebdir.cgi > PR > Applications > VSs > VSs__H264__App

view libavcodec/cabac.c @ 9:ea1ba68cf0ed

find changesets by author, revision, files, or words in the commit message
update to match api changes + add sscc produced source
author Nina Engelhardt <nengel@mailbox.tu-berlin.de>
date Wed, 05 Jun 2013 14:43:26 +0200
parents
children
line source
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Context Adaptive Binary Arithmetic Coder.
25 */
26
27 #include <string.h>
28
29 #include "libavutil/common.h"
30 //#include "get_bits.h"
31 #include "cabac.h"
32
33 static const uint8_t lps_range[64][4]= {
34 {128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205},
35 {116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166},
36 { 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135},
37 { 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110},
38 { 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89},
39 { 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72},
40 { 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59},
41 { 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48},
42 { 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39},
43 { 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31},
44 { 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25},
45 { 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21},
46 { 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17},
47 { 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14},
48 { 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11},
49 { 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
50 };
51
52 uint8_t ff_h264_mlps_state[4*64];
53 uint8_t ff_h264_lps_range[4*2*64];
54 uint8_t ff_h264_lps_state[2*64];
55 uint8_t ff_h264_mps_state[2*64];
56
57 static const uint8_t mps_state[64]= {
58 1, 2, 3, 4, 5, 6, 7, 8,
59 9,10,11,12,13,14,15,16,
60 17,18,19,20,21,22,23,24,
61 25,26,27,28,29,30,31,32,
62 33,34,35,36,37,38,39,40,
63 41,42,43,44,45,46,47,48,
64 49,50,51,52,53,54,55,56,
65 57,58,59,60,61,62,62,63,
66 };
67
68 static const uint8_t lps_state[64]= {
69 0, 0, 1, 2, 2, 4, 4, 5,
70 6, 7, 8, 9, 9,11,11,12,
71 13,13,15,15,16,16,18,18,
72 19,19,21,21,22,22,23,24,
73 24,25,26,26,27,27,28,29,
74 29,30,30,30,31,32,32,33,
75 33,33,34,34,35,35,35,36,
76 36,36,37,37,37,38,38,63,
77 };
78
79 const uint8_t ff_h264_norm_shift[512]= {
80 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5,
81 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
82 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
83 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
84 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
85 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
86 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
87 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
88 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
89 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
90 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
91 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
92 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
93 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
94 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
95 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
96 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
97 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
98 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
99 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
100 };
101
102 /**
103 *
104 * @param buf_size size of buf in bits
105 */
106 void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
107 c->bytestream_start=
108 c->bytestream= buf;
109 c->bytestream_end= buf + buf_size;
110
111 #if CABAC_BITS == 16
112 c->low = (*c->bytestream++)<<18;
113 c->low+= (*c->bytestream++)<<10;
114 #else
115 c->low = (*c->bytestream++)<<10;
116 #endif
117 c->low+= ((*c->bytestream++)<<2) + 2;
118 c->range= 0x1FE;
119 }
120
121 void ff_init_cabac_states(){
122 int i, j;
123
124 for(i=0; i<64; i++){
125 for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
126 ff_h264_lps_range[j*2*64+2*i+0]=
127 ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j];
128 }
129
130 ff_h264_mlps_state[128+2*i+0]=
131 ff_h264_mps_state[2*i+0]= 2*mps_state[i]+0;
132 ff_h264_mlps_state[128+2*i+1]=
133 ff_h264_mps_state[2*i+1]= 2*mps_state[i]+1;
134
135 if( i ){
136 #ifdef BRANCHLESS_CABAC_DECODER
137 ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0;
138 ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1;
139 }else{
140 ff_h264_mlps_state[128-2*i-1]= 1;
141 ff_h264_mlps_state[128-2*i-2]= 0;
142 #else
143 ff_h264_lps_state[2*i+0]= 2*lps_state[i]+0;
144 ff_h264_lps_state[2*i+1]= 2*lps_state[i]+1;
145 }else{
146 ff_h264_lps_state[2*i+0]= 1;
147 ff_h264_lps_state[2*i+1]= 0;
148 #endif
149 }
150 }
151 }
152
153 #ifdef TEST
154 #define SIZE 10240
155 #define START_TIMER
156 #define STOP_TIMER(...)
157 #define av_log(...)
158 // #include "libavutil/lfg.h"
159 #include "avcodec.h"
160 #include "cabac.h"
161
162 int main(void){
163 CABACContext c;
164 uint8_t b[9*SIZE];
165 uint8_t r[9*SIZE];
166 int i;
167 uint8_t state[10]= {0};
168 // AVLFG prng;
169
170 // // av_lfg_init(&prng, 1);
171 // ff_init_cabac_encoder(&c, b, SIZE);
172 // ff_init_cabac_states();
173 //
174 // for(i=0; i<SIZE; i++){
175 // r[i] = i%7; //av_lfg_get(&prng) % 7;
176 // }
177 //
178 // for(i=0; i<SIZE; i++){
179 // START_TIMER
180 // put_cabac_bypass(&c, r[i]&1);
181 // STOP_TIMER("put_cabac_bypass")
182 // }
183 //
184 // for(i=0; i<SIZE; i++){
185 // START_TIMER
186 // put_cabac(&c, state, r[i]&1);
187 // STOP_TIMER("put_cabac")
188 // }
189 //
190 // for(i=0; i<SIZE; i++){
191 // START_TIMER
192 // put_cabac_u(&c, state, r[i], 6, 3, i&1);
193 // STOP_TIMER("put_cabac_u")
194 // }
195 //
196 // for(i=0; i<SIZE; i++){
197 // START_TIMER
198 // put_cabac_ueg(&c, state, r[i], 3, 0, 1, 2);
199 // STOP_TIMER("put_cabac_ueg")
200 // }
201 //
202 // put_cabac_terminate(&c, 1);
203
204 ff_init_cabac_decoder(&c, b, SIZE);
205
206 memset(state, 0, sizeof(state));
207
208 for(i=0; i<SIZE; i++){
209 START_TIMER
210 if( (r[i]&1) != get_cabac_bypass(&c) )
211 av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i);
212 STOP_TIMER("get_cabac_bypass")
213 }
214
215 for(i=0; i<SIZE; i++){
216 START_TIMER
217 if( (r[i]&1) != get_cabac(&c, state) )
218 av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);
219 STOP_TIMER("get_cabac")
220 }
221 #if 0
222 for(i=0; i<SIZE; i++){
223 START_TIMER
224 if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) )
225 av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i);
226 STOP_TIMER("get_cabac_u")
227 }
228
229 for(i=0; i<SIZE; i++){
230 START_TIMER
231 if( r[i] != get_cabac_ueg(&c, state, 3, 0, 1, 2))
232 av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i);
233 STOP_TIMER("get_cabac_ueg")
234 }
235 #endif
236 if(!get_cabac_terminate(&c))
237 av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");
238
239 return 0;
240 }
241
242 #endif /* TEST */