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 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 = FF_I_TYPE;
79 void ff_fetch_timestamp(AVCodecParserContext *s){
81 s->dts= s->pts= AV_NOPTS_VALUE;
83 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
84 if ( s->next_frame_offset >= s->cur_frame_offset[i]
85 &&(s-> frame_offset < s->cur_frame_offset[i] || !s->frame_offset)
86 && s->next_frame_offset < s->cur_frame_end[i]){
87 s->dts= s->cur_frame_dts[i];
88 s->pts= s->cur_frame_pts[i];
89 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
97 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output)
98 * @param pts input presentation timestamp
99 * @param dts input decoding timestamp
100 * @param poutbuf will contain a pointer to the first byte of the output frame
101 * @param poutbuf_size will contain the length of the output frame
102 * @return the number of bytes of the input bitstream used
107 * len = av_parser_parse(myparser, AVCodecContext, &data, &size,
114 * decode_frame(data, size);
118 int av_parser_parse(AVCodecParserContext *s,
119 AVCodecContext *avctx,
120 uint8_t **poutbuf, int *poutbuf_size,
121 const uint8_t *buf, int buf_size,
122 int64_t pts, int64_t dts)
125 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
128 /* padding is always necessary even if EOF, so we add it here */
129 memset(dummy_buf, 0, sizeof(dummy_buf));
132 /* add a new packet descriptor */
133 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
134 s->cur_frame_start_index = i;
135 s->cur_frame_offset[i] = s->cur_offset;
136 s->cur_frame_end[i] = s->cur_offset + buf_size;
137 s->cur_frame_pts[i] = pts;
138 s->cur_frame_dts[i] = dts;
141 if (s->fetch_timestamp){
142 s->fetch_timestamp=0;
143 s->last_pts = s->pts;
144 s->last_dts = s->dts;
145 ff_fetch_timestamp(s);
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 != FF_I_TYPE && (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 * combines the (truncated) bitstream to a complete frame
218 * @returns -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)
224 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
225 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
229 /* Copy overread bytes from last frame into buffer. */
230 for(; pc->overread>0; pc->overread--){
231 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
234 /* flush remaining if EOF */
235 if(!*buf_size && next == END_NOT_FOUND){
239 pc->last_index= pc->index;
241 /* copy into buffer end return */
242 if(next == END_NOT_FOUND){
243 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
246 return AVERROR(ENOMEM);
247 pc->buffer = new_buffer;
248 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
249 pc->index += *buf_size;
254 pc->overread_index= pc->index + next;
256 /* append to buffer */
258 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
261 return AVERROR(ENOMEM);
262 pc->buffer = new_buffer;
263 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
268 /* store overread bytes */
269 for(;next < 0; next++){
270 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
276 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
277 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
284 void ff_parse_close(AVCodecParserContext *s)
286 ParseContext *pc = s->priv_data;
291 void ff_parse1_close(AVCodecParserContext *s)
293 ParseContext1 *pc1 = s->priv_data;
295 av_free(pc1->pc.buffer);
299 /*************************/
301 int ff_mpeg4video_split(AVCodecContext *avctx,
302 const uint8_t *buf, int buf_size)
307 for(i=0; i<buf_size; i++){
308 state= (state<<8) | buf[i];
309 if(state == 0x1B3 || state == 0x1B6)