Only store timestamps when there are timestamps.
[libav.git] / libavcodec / parser.c
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1/*
2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2003 Michael Niedermayer.
5 *
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6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
b78e7197 11 * version 2.1 of the License, or (at your option) any later version.
8424cf50 12 *
b78e7197 13 * FFmpeg is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
b78e7197 19 * License along with FFmpeg; if not, write to the Free Software
5509bffa 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
8424cf50 21 */
1fddeecd 22
4067d81b 23#include "parser.h"
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24
25AVCodecParser *av_first_parser = NULL;
26
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27AVCodecParser* av_parser_next(AVCodecParser *p){
28 if(p) return p->next;
29 else return av_first_parser;
30}
31
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32void av_register_codec_parser(AVCodecParser *parser)
33{
34 parser->next = av_first_parser;
35 av_first_parser = parser;
36}
37
38AVCodecParserContext *av_parser_init(int codec_id)
39{
40 AVCodecParserContext *s;
41 AVCodecParser *parser;
42 int ret;
115329f1 43
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44 if(codec_id == CODEC_ID_NONE)
45 return NULL;
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46
47 for(parser = av_first_parser; parser != NULL; parser = parser->next) {
48 if (parser->codec_ids[0] == codec_id ||
49 parser->codec_ids[1] == codec_id ||
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50 parser->codec_ids[2] == codec_id ||
51 parser->codec_ids[3] == codec_id ||
52 parser->codec_ids[4] == codec_id)
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53 goto found;
54 }
55 return NULL;
56 found:
57 s = av_mallocz(sizeof(AVCodecParserContext));
58 if (!s)
59 return NULL;
60 s->parser = parser;
61 s->priv_data = av_mallocz(parser->priv_data_size);
62 if (!s->priv_data) {
63 av_free(s);
64 return NULL;
65 }
66 if (parser->parser_init) {
67 ret = parser->parser_init(s);
68 if (ret != 0) {
69 av_free(s->priv_data);
70 av_free(s);
71 return NULL;
72 }
73 }
a62aecce 74 s->fetch_timestamp=1;
adcb72b5 75 s->pict_type = FF_I_TYPE;
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76 return s;
77}
78
ec0c5d48 79void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
cd614494 80 int i;
ebdd7377 81
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82 s->dts= s->pts= AV_NOPTS_VALUE;
83 s->offset= 0;
84 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
21e30589 85 if ( s->next_frame_offset + off >= s->cur_frame_offset[i]
ebdd7377 86 &&(s-> frame_offset < s->cur_frame_offset[i] || !s->frame_offset)
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87 //check is disabled becausue mpeg-ts doesnt send complete PES packets
88 && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
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89 s->dts= s->cur_frame_dts[i];
90 s->pts= s->cur_frame_pts[i];
91 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
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92 if(remove)
93 s->cur_frame_offset[i]= INT64_MAX;
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94 }
95 }
96}
97
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98/**
99 *
100 * @param buf input
101 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output)
102 * @param pts input presentation timestamp
103 * @param dts input decoding timestamp
104 * @param poutbuf will contain a pointer to the first byte of the output frame
105 * @param poutbuf_size will contain the length of the output frame
106 * @return the number of bytes of the input bitstream used
107 *
108 * Example:
109 * @code
110 * while(in_len){
111 * len = av_parser_parse(myparser, AVCodecContext, &data, &size,
112 * in_data, in_len,
113 * pts, dts);
114 * in_data += len;
115 * in_len -= len;
116 *
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117 * if(size)
118 * decode_frame(data, size);
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119 * }
120 * @endcode
121 */
115329f1 122int av_parser_parse(AVCodecParserContext *s,
8424cf50 123 AVCodecContext *avctx,
115329f1 124 uint8_t **poutbuf, int *poutbuf_size,
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125 const uint8_t *buf, int buf_size,
126 int64_t pts, int64_t dts)
8424cf50 127{
47917785 128 int index, i;
6e45e928 129 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
115329f1 130
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131 if (buf_size == 0) {
132 /* padding is always necessary even if EOF, so we add it here */
133 memset(dummy_buf, 0, sizeof(dummy_buf));
134 buf = dummy_buf;
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135 } else {
136 /* add a new packet descriptor */
e4e3230e 137 if(pts != AV_NOPTS_VALUE || dts != AV_NOPTS_VALUE){
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138 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
139 s->cur_frame_start_index = i;
140 s->cur_frame_offset[i] = s->cur_offset;
141 s->cur_frame_end[i] = s->cur_offset + buf_size;
142 s->cur_frame_pts[i] = pts;
143 s->cur_frame_dts[i] = dts;
e4e3230e 144 }
cb63a4b3 145 }
b84f2a35 146
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147 if (s->fetch_timestamp){
148 s->fetch_timestamp=0;
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149 s->last_pts = s->pts;
150 s->last_dts = s->dts;
ec0c5d48 151 ff_fetch_timestamp(s, 0, 0);
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152 }
153
8424cf50 154 /* WARNING: the returned index can be negative */
c53d2d90 155 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
949b1a13 156//av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id);
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157 /* update the file pointer */
158 if (*poutbuf_size) {
b84f2a35 159 /* fill the data for the current frame */
26f23725 160 s->frame_offset = s->next_frame_offset;
115329f1 161
b84f2a35 162 /* offset of the next frame */
26f23725 163 s->next_frame_offset = s->cur_offset + index;
591569b5 164 s->fetch_timestamp=1;
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165 }
166 if (index < 0)
167 index = 0;
168 s->cur_offset += index;
169 return index;
170}
171
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172/**
173 *
174 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
748c2fca 175 * @deprecated use AVBitstreamFilter
73480a15 176 */
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177int av_parser_change(AVCodecParserContext *s,
178 AVCodecContext *avctx,
115329f1 179 uint8_t **poutbuf, int *poutbuf_size,
90ad92b3 180 const uint8_t *buf, int buf_size, int keyframe){
115329f1 181
90ad92b3 182 if(s && s->parser->split){
73480a15 183 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
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184 int i= s->parser->split(avctx, buf, buf_size);
185 buf += i;
186 buf_size -= i;
187 }
188 }
189
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190 /* cast to avoid warning about discarding qualifiers */
191 *poutbuf= (uint8_t *) buf;
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192 *poutbuf_size= buf_size;
193 if(avctx->extradata){
194 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
9701840b 195 /*||(s->pict_type != FF_I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
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196 /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
197 int size= buf_size + avctx->extradata_size;
198 *poutbuf_size= size;
199 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
115329f1 200
90ad92b3 201 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
73480a15 202 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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203 return 1;
204 }
205 }
206
207 return 0;
208}
209
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210void av_parser_close(AVCodecParserContext *s)
211{
99c1c388 212 if(s){
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213 if (s->parser->parser_close)
214 s->parser->parser_close(s);
215 av_free(s->priv_data);
216 av_free(s);
99c1c388 217 }
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218}
219
220/*****************************************************/
221
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222/**
223 * combines the (truncated) bitstream to a complete frame
1f96bafb 224 * @returns -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error
8424cf50 225 */
c53d2d90 226int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
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227{
228#if 0
229 if(pc->overread){
230 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
231 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
232 }
233#endif
234
e42dba48 235 /* Copy overread bytes from last frame into buffer. */
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236 for(; pc->overread>0; pc->overread--){
237 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
238 }
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239
240 /* flush remaining if EOF */
241 if(!*buf_size && next == END_NOT_FOUND){
242 next= 0;
243 }
244
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245 pc->last_index= pc->index;
246
247 /* copy into buffer end return */
248 if(next == END_NOT_FOUND){
1f96bafb 249 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
8424cf50 250
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251 if(!new_buffer)
252 return AVERROR(ENOMEM);
253 pc->buffer = new_buffer;
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254 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
255 pc->index += *buf_size;
256 return -1;
257 }
258
259 *buf_size=
260 pc->overread_index= pc->index + next;
115329f1 261
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262 /* append to buffer */
263 if(pc->index){
1f96bafb 264 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
8424cf50 265
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266 if(!new_buffer)
267 return AVERROR(ENOMEM);
268 pc->buffer = new_buffer;
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269 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
270 pc->index = 0;
271 *buf= pc->buffer;
272 }
273
274 /* store overread bytes */
275 for(;next < 0; next++){
276 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
277 pc->overread++;
278 }
279
280#if 0
281 if(pc->overread){
282 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
283 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
284 }
285#endif
286
287 return 0;
288}
289
e4cb187d 290void ff_parse_close(AVCodecParserContext *s)
8424cf50 291{
e4cb187d 292 ParseContext *pc = s->priv_data;
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293
294 av_free(pc->buffer);
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295}
296
4067d81b 297void ff_parse1_close(AVCodecParserContext *s)
8424cf50 298{
e4cb187d 299 ParseContext1 *pc1 = s->priv_data;
8424cf50 300
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301 av_free(pc1->pc.buffer);
302 av_free(pc1->enc);
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303}
304
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305/*************************/
306
d136d2fc 307int ff_mpeg4video_split(AVCodecContext *avctx,
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308 const uint8_t *buf, int buf_size)
309{
310 int i;
311 uint32_t state= -1;
115329f1 312
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313 for(i=0; i<buf_size; i++){
314 state= (state<<8) | buf[i];
315 if(state == 0x1B3 || state == 0x1B6)
73480a15 316 return i-3;
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317 }
318 return 0;
319}