2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard
4 * Copyright (c) 2003 Michael Niedermayer
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/atomic.h"
27 #include "libavutil/mem.h"
29 static AVCodecParser *av_first_parser = NULL;
31 AVCodecParser* av_parser_next(AVCodecParser *p){
33 else return av_first_parser;
36 void av_register_codec_parser(AVCodecParser *parser)
39 parser->next = av_first_parser;
40 } while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)&av_first_parser, parser->next, parser));
43 AVCodecParserContext *av_parser_init(int codec_id)
45 AVCodecParserContext *s = NULL;
46 AVCodecParser *parser;
49 if(codec_id == AV_CODEC_ID_NONE)
52 for(parser = av_first_parser; parser != NULL; parser = parser->next) {
53 if (parser->codec_ids[0] == codec_id ||
54 parser->codec_ids[1] == codec_id ||
55 parser->codec_ids[2] == codec_id ||
56 parser->codec_ids[3] == codec_id ||
57 parser->codec_ids[4] == codec_id)
62 s = av_mallocz(sizeof(AVCodecParserContext));
66 s->priv_data = av_mallocz(parser->priv_data_size);
70 s->pict_type = AV_PICTURE_TYPE_I;
71 if (parser->parser_init) {
72 ret = parser->parser_init(s);
77 s->convergence_duration = 0;
78 s->dts_sync_point = INT_MIN;
79 s->dts_ref_dts_delta = INT_MIN;
80 s->pts_dts_delta = INT_MIN;
85 av_freep(&s->priv_data);
90 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
93 s->dts= s->pts= AV_NOPTS_VALUE;
96 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
97 if ( s->cur_offset + off >= s->cur_frame_offset[i]
98 && (s->frame_offset < s->cur_frame_offset[i] ||
99 (!s->frame_offset && !s->next_frame_offset)) // first field/frame
100 // check disabled since MPEG-TS does not send complete PES packets
101 && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
102 s->dts= s->cur_frame_dts[i];
103 s->pts= s->cur_frame_pts[i];
104 s->pos= s->cur_frame_pos[i];
105 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
107 s->cur_frame_offset[i]= INT64_MAX;
108 if(s->cur_offset + off < s->cur_frame_end[i])
114 int av_parser_parse2(AVCodecParserContext *s,
115 AVCodecContext *avctx,
116 uint8_t **poutbuf, int *poutbuf_size,
117 const uint8_t *buf, int buf_size,
118 int64_t pts, int64_t dts,
122 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
124 if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
125 s->next_frame_offset =
127 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
131 /* padding is always necessary even if EOF, so we add it here */
132 memset(dummy_buf, 0, sizeof(dummy_buf));
134 } else if (s->cur_offset + buf_size !=
135 s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
136 /* add a new packet descriptor */
137 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
138 s->cur_frame_start_index = i;
139 s->cur_frame_offset[i] = s->cur_offset;
140 s->cur_frame_end[i] = s->cur_offset + buf_size;
141 s->cur_frame_pts[i] = pts;
142 s->cur_frame_dts[i] = dts;
143 s->cur_frame_pos[i] = pos;
146 if (s->fetch_timestamp){
147 s->fetch_timestamp=0;
148 s->last_pts = s->pts;
149 s->last_dts = s->dts;
150 s->last_pos = s->pos;
151 ff_fetch_timestamp(s, 0, 0);
154 /* WARNING: the returned index can be negative */
155 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
156 /* update the file pointer */
158 /* fill the data for the current frame */
159 s->frame_offset = s->next_frame_offset;
161 /* offset of the next frame */
162 s->next_frame_offset = s->cur_offset + index;
163 s->fetch_timestamp=1;
167 s->cur_offset += index;
171 int av_parser_change(AVCodecParserContext *s,
172 AVCodecContext *avctx,
173 uint8_t **poutbuf, int *poutbuf_size,
174 const uint8_t *buf, int buf_size, int keyframe){
176 if(s && s->parser->split){
177 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
178 int i= s->parser->split(avctx, buf, buf_size);
184 /* cast to avoid warning about discarding qualifiers */
185 *poutbuf= (uint8_t *) buf;
186 *poutbuf_size= buf_size;
187 if(avctx->extradata){
188 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
189 /*||(s->pict_type != AV_PICTURE_TYPE_I && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
190 /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
191 int size= buf_size + avctx->extradata_size;
193 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
195 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
196 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
204 void av_parser_close(AVCodecParserContext *s)
207 if (s->parser->parser_close)
208 s->parser->parser_close(s);
209 av_free(s->priv_data);
214 /*****************************************************/
216 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
219 av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
220 pc->overread, pc->state, next, pc->index, pc->overread_index);
221 av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
224 /* Copy overread bytes from last frame into buffer. */
225 for(; pc->overread>0; pc->overread--){
226 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
229 /* flush remaining if EOF */
230 if(!*buf_size && next == END_NOT_FOUND){
234 pc->last_index= pc->index;
236 /* copy into buffer end return */
237 if(next == END_NOT_FOUND){
238 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
241 return AVERROR(ENOMEM);
242 pc->buffer = new_buffer;
243 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
244 pc->index += *buf_size;
249 pc->overread_index= pc->index + next;
251 /* append to buffer */
253 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
256 return AVERROR(ENOMEM);
257 pc->buffer = new_buffer;
258 if (next > -FF_INPUT_BUFFER_PADDING_SIZE)
259 memcpy(&pc->buffer[pc->index], *buf,
260 next + FF_INPUT_BUFFER_PADDING_SIZE);
265 /* store overread bytes */
266 for(;next < 0; next++){
267 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
268 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
273 av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
274 pc->overread, pc->state, next, pc->index, pc->overread_index);
275 av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
281 void ff_parse_close(AVCodecParserContext *s)
283 ParseContext *pc = s->priv_data;
285 av_freep(&pc->buffer);
288 /*************************/
290 int ff_mpeg4video_split(AVCodecContext *avctx,
291 const uint8_t *buf, int buf_size)
296 for(i=0; i<buf_size; i++){
297 state= (state<<8) | buf[i];
298 if(state == 0x1B3 || state == 0x1B6)