In mpegts muxer, fix rbsp trailing bits in AUD nal, fixes issue #2122
[libav.git] / libavcodec / h264_parser.c
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1/*
2 * H.26L/H.264/AVC/JVT/14496-10/... parser
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
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20 */
21
22/**
ba87f080 23 * @file
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24 * H.264 / AVC / MPEG4 part10 parser.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28#include "parser.h"
29#include "h264_parser.h"
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30#include "h264data.h"
31#include "golomb.h"
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32
33#include <assert.h>
34
35
36int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
37{
38 int i;
39 uint32_t state;
40 ParseContext *pc = &(h->s.parse_context);
41//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
42// mb_addr= pc->mb_addr - 1;
43 state= pc->state;
44 if(state>13)
45 state= 7;
46
47 for(i=0; i<buf_size; i++){
48 if(state==7){
b250f9c6 49#if HAVE_FAST_UNALIGNED
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50 /* we check i<buf_size instead of i+3/7 because its simpler
51 * and there should be FF_INPUT_BUFFER_PADDING_SIZE bytes at the end
52 */
b250f9c6 53# if HAVE_FAST_64BIT
4d8eb2e8 54 while(i<buf_size && !((~*(const uint64_t*)(buf+i) & (*(const uint64_t*)(buf+i) - 0x0101010101010101ULL)) & 0x8080808080808080ULL))
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55 i+=8;
56# else
4d8eb2e8 57 while(i<buf_size && !((~*(const uint32_t*)(buf+i) & (*(const uint32_t*)(buf+i) - 0x01010101U)) & 0x80808080U))
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58 i+=4;
59# endif
60#endif
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61 for(; i<buf_size; i++){
62 if(!buf[i]){
63 state=2;
64 break;
65 }
66 }
67 }else if(state<=2){
68 if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
69 else if(buf[i]) state = 7;
70 else state>>=1; //2->1, 1->0, 0->0
71 }else if(state<=5){
72 int v= buf[i] & 0x1F;
9e85f9c5 73 if(v==6 || v==7 || v==8 || v==9){
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74 if(pc->frame_start_found){
75 i++;
9aa1cfec 76 goto found;
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77 }
78 }else if(v==1 || v==2 || v==5){
79 if(pc->frame_start_found){
80 state+=8;
81 continue;
82 }else
83 pc->frame_start_found = 1;
84 }
85 state= 7;
86 }else{
87 if(buf[i] & 0x80)
88 goto found;
89 state= 7;
90 }
91 }
92 pc->state= state;
93 return END_NOT_FOUND;
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94
95found:
96 pc->state=7;
97 pc->frame_start_found= 0;
98 return i-(state&5);
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99}
100
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101/*!
102 * Parse NAL units of found picture and decode some basic information.
103 *
104 * @param s parser context.
105 * @param avctx codec context.
106 * @param buf buffer with field/frame data.
107 * @param buf_size size of the buffer.
108 */
109static inline int parse_nal_units(AVCodecParserContext *s,
110 AVCodecContext *avctx,
111 const uint8_t *buf, int buf_size)
112{
113 H264Context *h = s->priv_data;
114 const uint8_t *buf_end = buf + buf_size;
96c3da93 115 unsigned int pps_id;
ff6474dd 116 unsigned int slice_type;
8fa0ae06 117 int state = -1;
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118 const uint8_t *ptr;
119
120 /* set some sane default values */
121 s->pict_type = FF_I_TYPE;
0ed260c7 122 s->key_frame = 0;
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123
124 h->s.avctx= avctx;
0ed260c7 125 h->sei_recovery_frame_cnt = -1;
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126 h->sei_dpb_output_delay = 0;
127 h->sei_cpb_removal_delay = -1;
128 h->sei_buffering_period_present = 0;
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129
130 for(;;) {
131 int src_length, dst_length, consumed;
132 buf = ff_find_start_code(buf, buf_end, &state);
133 if(buf >= buf_end)
134 break;
135 --buf;
136 src_length = buf_end - buf;
137 switch (state & 0x1f) {
138 case NAL_SLICE:
139 case NAL_IDR_SLICE:
140 // Do not walk the whole buffer just to decode slice header
141 if (src_length > 20)
142 src_length = 20;
143 break;
144 }
145 ptr= ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
146 if (ptr==NULL || dst_length < 0)
147 break;
148
149 init_get_bits(&h->s.gb, ptr, 8*dst_length);
150 switch(h->nal_unit_type) {
151 case NAL_SPS:
152 ff_h264_decode_seq_parameter_set(h);
153 break;
154 case NAL_PPS:
155 ff_h264_decode_picture_parameter_set(h, h->s.gb.size_in_bits);
156 break;
157 case NAL_SEI:
158 ff_h264_decode_sei(h);
159 break;
160 case NAL_IDR_SLICE:
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161 s->key_frame = 1;
162 /* fall through */
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163 case NAL_SLICE:
164 get_ue_golomb(&h->s.gb); // skip first_mb_in_slice
165 slice_type = get_ue_golomb_31(&h->s.gb);
166 s->pict_type = golomb_to_pict_type[slice_type % 5];
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167 if (h->sei_recovery_frame_cnt >= 0) {
168 /* key frame, since recovery_frame_cnt is set */
169 s->key_frame = 1;
170 }
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171 pps_id= get_ue_golomb(&h->s.gb);
172 if(pps_id>=MAX_PPS_COUNT) {
173 av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n");
174 return -1;
175 }
176 if(!h->pps_buffers[pps_id]) {
177 av_log(h->s.avctx, AV_LOG_ERROR, "non-existing PPS referenced\n");
178 return -1;
179 }
180 h->pps= *h->pps_buffers[pps_id];
181 if(!h->sps_buffers[h->pps.sps_id]) {
182 av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS referenced\n");
183 return -1;
184 }
185 h->sps = *h->sps_buffers[h->pps.sps_id];
186 h->frame_num = get_bits(&h->s.gb, h->sps.log2_max_frame_num);
187
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188 avctx->profile = h->sps.profile_idc;
189 avctx->level = h->sps.level_idc;
190
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191 if(h->sps.frame_mbs_only_flag){
192 h->s.picture_structure= PICT_FRAME;
193 }else{
194 if(get_bits1(&h->s.gb)) { //field_pic_flag
195 h->s.picture_structure= PICT_TOP_FIELD + get_bits1(&h->s.gb); //bottom_field_flag
196 } else {
197 h->s.picture_structure= PICT_FRAME;
198 }
199 }
200
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201 if(h->sps.pic_struct_present_flag) {
202 switch (h->sei_pic_struct) {
203 case SEI_PIC_STRUCT_TOP_FIELD:
204 case SEI_PIC_STRUCT_BOTTOM_FIELD:
fc9fe428 205 s->repeat_pict = 0;
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206 break;
207 case SEI_PIC_STRUCT_FRAME:
208 case SEI_PIC_STRUCT_TOP_BOTTOM:
209 case SEI_PIC_STRUCT_BOTTOM_TOP:
fc9fe428 210 s->repeat_pict = 1;
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211 break;
212 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
213 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
fc9fe428 214 s->repeat_pict = 2;
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215 break;
216 case SEI_PIC_STRUCT_FRAME_DOUBLING:
fc9fe428 217 s->repeat_pict = 3;
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218 break;
219 case SEI_PIC_STRUCT_FRAME_TRIPLING:
fc9fe428 220 s->repeat_pict = 5;
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221 break;
222 default:
fc9fe428 223 s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
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224 break;
225 }
226 } else {
fc9fe428 227 s->repeat_pict = h->s.picture_structure == PICT_FRAME ? 1 : 0;
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228 }
229
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230 return 0; /* no need to evaluate the rest */
231 }
232 buf += consumed;
233 }
234 /* didn't find a picture! */
235 av_log(h->s.avctx, AV_LOG_ERROR, "missing picture in access unit\n");
236 return -1;
237}
238
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239static int h264_parse(AVCodecParserContext *s,
240 AVCodecContext *avctx,
241 const uint8_t **poutbuf, int *poutbuf_size,
242 const uint8_t *buf, int buf_size)
243{
244 H264Context *h = s->priv_data;
245 ParseContext *pc = &h->s.parse_context;
246 int next;
247
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248 if (!h->got_first) {
249 h->got_first = 1;
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250 if (avctx->extradata_size) {
251 h->s.avctx = avctx;
252 ff_h264_decode_extradata(h);
253 }
254 }
255
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256 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
257 next= buf_size;
258 }else{
259 next= ff_h264_find_frame_end(h, buf, buf_size);
260
261 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
262 *poutbuf = NULL;
263 *poutbuf_size = 0;
264 return buf_size;
265 }
266
267 if(next<0 && next != END_NOT_FOUND){
268 assert(pc->last_index + next >= 0 );
269 ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
270 }
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271
272 parse_nal_units(s, avctx, buf, buf_size);
c733922e 273
2c0c5e12 274 if (h->sei_cpb_removal_delay >= 0) {
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275 s->dts_sync_point = h->sei_buffering_period_present;
276 s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
277 s->pts_dts_delta = h->sei_dpb_output_delay;
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278 } else {
279 s->dts_sync_point = INT_MIN;
280 s->dts_ref_dts_delta = INT_MIN;
281 s->pts_dts_delta = INT_MIN;
282 }
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283 if (s->flags & PARSER_FLAG_ONCE) {
284 s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
285 }
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286 }
287
288 *poutbuf = buf;
289 *poutbuf_size = buf_size;
290 return next;
291}
292
293static int h264_split(AVCodecContext *avctx,
294 const uint8_t *buf, int buf_size)
295{
296 int i;
297 uint32_t state = -1;
298 int has_sps= 0;
299
300 for(i=0; i<=buf_size; i++){
301 if((state&0xFFFFFF1F) == 0x107)
302 has_sps=1;
303/* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
304 }*/
305 if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
306 if(has_sps){
307 while(i>4 && buf[i-5]==0) i--;
308 return i-4;
309 }
310 }
311 if (i<buf_size)
312 state= (state<<8) | buf[i];
313 }
314 return 0;
315}
316
dd990075 317static void close(AVCodecParserContext *s)
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318{
319 H264Context *h = s->priv_data;
320 ParseContext *pc = &h->s.parse_context;
321
322 av_free(pc->buffer);
15861962 323 ff_h264_free_context(h);
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324}
325
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326static int init(AVCodecParserContext *s)
327{
328 H264Context *h = s->priv_data;
329 h->thread_context[0] = h;
330 return 0;
331}
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332
333AVCodecParser h264_parser = {
0d3d172f 334 { CODEC_ID_H264 },
26b4fe82 335 sizeof(H264Context),
e9ca315d 336 init,
26b4fe82 337 h264_parse,
3ee4f5e4 338 close,
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339 h264_split,
340};