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
25 static AVCodecParser *av_first_parser = NULL;
27 AVCodecParser* av_parser_next(AVCodecParser *p){
29 else return av_first_parser;
32 void av_register_codec_parser(AVCodecParser *parser)
34 parser->next = av_first_parser;
35 av_first_parser = parser;
38 AVCodecParserContext *av_parser_init(int codec_id)
40 AVCodecParserContext *s;
41 AVCodecParser *parser;
44 if(codec_id == CODEC_ID_NONE)
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 ||
50 parser->codec_ids[2] == codec_id ||
51 parser->codec_ids[3] == codec_id ||
52 parser->codec_ids[4] == codec_id)
57 s = av_mallocz(sizeof(AVCodecParserContext));
61 s->priv_data = av_mallocz(parser->priv_data_size);
66 if (parser->parser_init) {
67 ret = parser->parser_init(s);
69 av_free(s->priv_data);
75 s->pict_type = AV_PICTURE_TYPE_I;
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;
84 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
87 s->dts= s->pts= AV_NOPTS_VALUE;
90 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
91 if ( s->cur_offset + off >= s->cur_frame_offset[i]
92 && (s->frame_offset < s->cur_frame_offset[i] ||
93 (!s->frame_offset && !s->next_frame_offset)) // first field/frame
94 //check is disabled because mpeg-ts doesnt send complete PES packets
95 && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
96 s->dts= s->cur_frame_dts[i];
97 s->pts= s->cur_frame_pts[i];
98 s->pos= s->cur_frame_pos[i];
99 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
101 s->cur_frame_offset[i]= INT64_MAX;
102 if(s->cur_offset + off < s->cur_frame_end[i])
108 int av_parser_parse2(AVCodecParserContext *s,
109 AVCodecContext *avctx,
110 uint8_t **poutbuf, int *poutbuf_size,
111 const uint8_t *buf, int buf_size,
112 int64_t pts, int64_t dts,
116 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
118 if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
119 s->next_frame_offset =
121 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
125 /* padding is always necessary even if EOF, so we add it here */
126 memset(dummy_buf, 0, sizeof(dummy_buf));
128 } else if (s->cur_offset + buf_size !=
129 s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
130 /* add a new packet descriptor */
131 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
132 s->cur_frame_start_index = i;
133 s->cur_frame_offset[i] = s->cur_offset;
134 s->cur_frame_end[i] = s->cur_offset + buf_size;
135 s->cur_frame_pts[i] = pts;
136 s->cur_frame_dts[i] = dts;
137 s->cur_frame_pos[i] = pos;
140 if (s->fetch_timestamp){
141 s->fetch_timestamp=0;
142 s->last_pts = s->pts;
143 s->last_dts = s->dts;
144 s->last_pos = s->pos;
145 ff_fetch_timestamp(s, 0, 0);
148 /* WARNING: the returned index can be negative */
149 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
150 //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);
151 /* update the file pointer */
153 /* fill the data for the current frame */
154 s->frame_offset = s->next_frame_offset;
156 /* offset of the next frame */
157 s->next_frame_offset = s->cur_offset + index;
158 s->fetch_timestamp=1;
162 s->cur_offset += index;
168 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
169 * @deprecated use AVBitstreamFilter
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 /*****************************************************/
217 * Combine the (truncated) bitstream to a complete frame.
218 * @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error
220 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
223 av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
224 pc->overread, pc->state, next, pc->index, pc->overread_index);
225 av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
228 /* Copy overread bytes from last frame into buffer. */
229 for(; pc->overread>0; pc->overread--){
230 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
233 /* flush remaining if EOF */
234 if(!*buf_size && next == END_NOT_FOUND){
238 pc->last_index= pc->index;
240 /* copy into buffer end return */
241 if(next == END_NOT_FOUND){
242 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
245 return AVERROR(ENOMEM);
246 pc->buffer = new_buffer;
247 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
248 pc->index += *buf_size;
253 pc->overread_index= pc->index + next;
255 /* append to buffer */
257 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
260 return AVERROR(ENOMEM);
261 pc->buffer = new_buffer;
262 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
267 /* store overread bytes */
268 for(;next < 0; next++){
269 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
270 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
275 av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
276 pc->overread, pc->state, next, pc->index, pc->overread_index);
277 av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
283 void ff_parse_close(AVCodecParserContext *s)
285 ParseContext *pc = s->priv_data;
287 av_freep(&pc->buffer);
290 void ff_parse1_close(AVCodecParserContext *s)
292 ParseContext1 *pc1 = s->priv_data;
294 av_free(pc1->pc.buffer);
298 /*************************/
300 int ff_mpeg4video_split(AVCodecContext *avctx,
301 const uint8_t *buf, int buf_size)
306 for(i=0; i<buf_size; i++){
307 state= (state<<8) | buf[i];
308 if(state == 0x1B3 || state == 0x1B6)