2 * Various utilities for ffmpeg system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 AVInputFormat *first_iformat = NULL;
25 AVOutputFormat *first_oformat = NULL;
26 AVImageFormat *first_image_format = NULL;
28 void av_register_input_format(AVInputFormat *format)
32 while (*p != NULL) p = &(*p)->next;
37 void av_register_output_format(AVOutputFormat *format)
41 while (*p != NULL) p = &(*p)->next;
46 int match_ext(const char *filename, const char *extensions)
54 ext = strrchr(filename, '.');
60 while (*p != '\0' && *p != ',' && q-ext1<sizeof(ext1)-1)
63 if (!strcasecmp(ext1, ext))
73 AVOutputFormat *guess_format(const char *short_name, const char *filename,
74 const char *mime_type)
76 AVOutputFormat *fmt, *fmt_found;
79 /* specific test for image sequences */
80 if (!short_name && filename &&
81 filename_number_test(filename) >= 0 &&
82 av_guess_image2_codec(filename) != CODEC_ID_NONE) {
83 return guess_format("image2", NULL, NULL);
85 if (!short_name && filename &&
86 filename_number_test(filename) >= 0 &&
87 guess_image_format(filename)) {
88 return guess_format("image", NULL, NULL);
91 /* find the proper file type */
97 if (fmt->name && short_name && !strcmp(fmt->name, short_name))
99 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
101 if (filename && fmt->extensions &&
102 match_ext(filename, fmt->extensions)) {
105 if (score > score_max) {
114 AVOutputFormat *guess_stream_format(const char *short_name, const char *filename,
115 const char *mime_type)
117 AVOutputFormat *fmt = guess_format(short_name, filename, mime_type);
120 AVOutputFormat *stream_fmt;
121 char stream_format_name[64];
123 snprintf(stream_format_name, sizeof(stream_format_name), "%s_stream", fmt->name);
124 stream_fmt = guess_format(stream_format_name, NULL, NULL);
134 * guesses the codec id based upon muxer and filename.
136 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
137 const char *filename, const char *mime_type, enum CodecType type){
138 if(type == CODEC_TYPE_VIDEO){
139 enum CodecID codec_id= CODEC_ID_NONE;
141 if(!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")){
142 codec_id= av_guess_image2_codec(filename);
144 if(codec_id == CODEC_ID_NONE)
145 codec_id= fmt->video_codec;
147 }else if(type == CODEC_TYPE_AUDIO)
148 return fmt->audio_codec;
150 return CODEC_ID_NONE;
153 AVInputFormat *av_find_input_format(const char *short_name)
156 for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) {
157 if (!strcmp(fmt->name, short_name))
163 /* memory handling */
166 * Default packet destructor
168 static void av_destruct_packet(AVPacket *pkt)
171 pkt->data = NULL; pkt->size = 0;
175 * Allocate the payload of a packet and intialized its fields to default values.
178 * @param size wanted payload size
179 * @return 0 if OK. AVERROR_xxx otherwise.
181 int av_new_packet(AVPacket *pkt, int size)
184 if((unsigned)size > (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
185 return AVERROR_NOMEM;
186 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
188 return AVERROR_NOMEM;
189 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
194 pkt->destruct = av_destruct_packet;
198 /* This is a hack - the packet memory allocation stuff is broken. The
199 packet is allocated if it was not really allocated */
200 int av_dup_packet(AVPacket *pkt)
202 if (pkt->destruct != av_destruct_packet) {
204 /* we duplicate the packet and don't forget to put the padding
206 if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
207 return AVERROR_NOMEM;
208 data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
210 return AVERROR_NOMEM;
212 memcpy(data, pkt->data, pkt->size);
213 memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
215 pkt->destruct = av_destruct_packet;
222 int fifo_init(FifoBuffer *f, int size)
224 f->buffer = av_malloc(size);
227 f->end = f->buffer + size;
228 f->wptr = f->rptr = f->buffer;
232 void fifo_free(FifoBuffer *f)
237 int fifo_size(FifoBuffer *f, uint8_t *rptr)
244 if (f->wptr >= rptr) {
245 size = f->wptr - rptr;
247 size = (f->end - rptr) + (f->wptr - f->buffer);
252 /* get data from the fifo (return -1 if not enough data) */
253 int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr)
262 if (f->wptr >= rptr) {
263 size = f->wptr - rptr;
265 size = (f->end - rptr) + (f->wptr - f->buffer);
270 while (buf_size > 0) {
274 memcpy(buf, rptr, len);
285 void fifo_realloc(FifoBuffer *f, unsigned int new_size){
286 unsigned int old_size= f->end - f->buffer;
288 if(old_size < new_size){
289 uint8_t *old= f->buffer;
291 f->buffer= av_realloc(f->buffer, new_size);
293 f->rptr += f->buffer - old;
294 f->wptr += f->buffer - old;
296 if(f->wptr < f->rptr){
297 memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
298 f->rptr += new_size - old_size;
300 f->end= f->buffer + new_size;
304 void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr)
317 memcpy(wptr, buf, len);
327 /* get data from the fifo (return -1 if not enough data) */
328 int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr)
330 uint8_t *rptr = *rptr_ptr;
333 if (f->wptr >= rptr) {
334 size = f->wptr - rptr;
336 size = (f->end - rptr) + (f->wptr - f->buffer);
341 while (buf_size > 0) {
345 put_buffer(pb, rptr, len);
355 int filename_number_test(const char *filename)
360 return get_frame_filename(buf, sizeof(buf), filename, 1);
363 /* guess file format */
364 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
366 AVInputFormat *fmt1, *fmt;
367 int score, score_max;
371 for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) {
372 if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
375 if (fmt1->read_probe) {
376 score = fmt1->read_probe(pd);
377 } else if (fmt1->extensions) {
378 if (match_ext(pd->filename, fmt1->extensions)) {
382 if (score > score_max) {
390 /************************************************************/
391 /* input media file */
394 * open a media file from an IO stream. 'fmt' must be specified.
397 static const char* format_to_name(void* ptr)
399 AVFormatContext* fc = (AVFormatContext*) ptr;
400 if(fc->iformat) return fc->iformat->name;
401 else if(fc->oformat) return fc->oformat->name;
405 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name };
407 AVFormatContext *av_alloc_format_context(void)
410 ic = av_mallocz(sizeof(AVFormatContext));
412 ic->av_class = &av_format_context_class;
416 int av_open_input_stream(AVFormatContext **ic_ptr,
417 ByteIOContext *pb, const char *filename,
418 AVInputFormat *fmt, AVFormatParameters *ap)
423 ic = av_alloc_format_context();
431 ic->duration = AV_NOPTS_VALUE;
432 ic->start_time = AV_NOPTS_VALUE;
433 pstrcpy(ic->filename, sizeof(ic->filename), filename);
435 /* allocate private data */
436 if (fmt->priv_data_size > 0) {
437 ic->priv_data = av_mallocz(fmt->priv_data_size);
438 if (!ic->priv_data) {
443 ic->priv_data = NULL;
446 err = ic->iformat->read_header(ic, ap);
451 ic->data_offset = url_ftell(&ic->pb);
457 av_freep(&ic->priv_data);
464 #define PROBE_BUF_SIZE 2048
467 * Open a media file as input. The codec are not opened. Only the file
468 * header (if present) is read.
470 * @param ic_ptr the opened media file handle is put here
471 * @param filename filename to open.
472 * @param fmt if non NULL, force the file format to use
473 * @param buf_size optional buffer size (zero if default is OK)
474 * @param ap additionnal parameters needed when opening the file (NULL if default)
475 * @return 0 if OK. AVERROR_xxx otherwise.
477 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
480 AVFormatParameters *ap)
482 int err, must_open_file, file_opened;
483 uint8_t buf[PROBE_BUF_SIZE];
484 AVProbeData probe_data, *pd = &probe_data;
485 ByteIOContext pb1, *pb = &pb1;
490 pd->filename = filename;
495 /* guess format if no file can be opened */
496 fmt = av_probe_input_format(pd, 0);
499 /* do not open file if the format does not need it. XXX: specific
500 hack needed to handle RTSP/TCP */
502 if (fmt && (fmt->flags & AVFMT_NOFILE)) {
504 pb= NULL; //FIXME this or memset(pb, 0, sizeof(ByteIOContext)); otherwise its uninitalized
507 if (!fmt || must_open_file) {
508 /* if no file needed do not try to open one */
509 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
515 url_setbufsize(pb, buf_size);
518 /* read probe data */
519 pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
520 if (url_fseek(pb, 0, SEEK_SET) == (offset_t)-EPIPE) {
522 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
530 /* guess file format */
532 fmt = av_probe_input_format(pd, 1);
535 /* if still no format found, error */
541 /* XXX: suppress this hack for redirectors */
542 #ifdef CONFIG_NETWORK
543 if (fmt == &redir_demux) {
544 err = redir_open(ic_ptr, pb);
550 /* check filename in case of an image number is expected */
551 if (fmt->flags & AVFMT_NEEDNUMBER) {
552 if (filename_number_test(filename) < 0) {
553 err = AVERROR_NUMEXPECTED;
557 err = av_open_input_stream(ic_ptr, pb, filename, fmt, ap);
569 /*******************************************************/
572 * Read a transport packet from a media file. This function is
573 * absolete and should never be used. Use av_read_frame() instead.
575 * @param s media file handle
576 * @param pkt is filled
577 * @return 0 if OK. AVERROR_xxx if error.
579 int av_read_packet(AVFormatContext *s, AVPacket *pkt)
581 return s->iformat->read_packet(s, pkt);
584 /**********************************************************/
586 /* get the number of samples of an audio frame. Return (-1) if error */
587 static int get_audio_frame_size(AVCodecContext *enc, int size)
591 if (enc->frame_size <= 1) {
592 /* specific hack for pcm codecs because no frame size is
594 switch(enc->codec_id) {
595 case CODEC_ID_PCM_S16LE:
596 case CODEC_ID_PCM_S16BE:
597 case CODEC_ID_PCM_U16LE:
598 case CODEC_ID_PCM_U16BE:
599 if (enc->channels == 0)
601 frame_size = size / (2 * enc->channels);
603 case CODEC_ID_PCM_S8:
604 case CODEC_ID_PCM_U8:
605 case CODEC_ID_PCM_MULAW:
606 case CODEC_ID_PCM_ALAW:
607 if (enc->channels == 0)
609 frame_size = size / (enc->channels);
612 /* used for example by ADPCM codecs */
613 if (enc->bit_rate == 0)
615 frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate;
619 frame_size = enc->frame_size;
625 /* return the frame duration in seconds, return 0 if not available */
626 static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
627 AVCodecParserContext *pc, AVPacket *pkt)
633 switch(st->codec.codec_type) {
634 case CODEC_TYPE_VIDEO:
635 *pnum = st->codec.frame_rate_base;
636 *pden = st->codec.frame_rate;
637 if (pc && pc->repeat_pict) {
639 *pnum = (*pnum) * (2 + pc->repeat_pict);
642 case CODEC_TYPE_AUDIO:
643 frame_size = get_audio_frame_size(&st->codec, pkt->size);
647 *pden = st->codec.sample_rate;
654 static int is_intra_only(AVCodecContext *enc){
655 if(enc->codec_type == CODEC_TYPE_AUDIO){
657 }else if(enc->codec_type == CODEC_TYPE_VIDEO){
658 switch(enc->codec_id){
660 case CODEC_ID_MJPEGB:
662 case CODEC_ID_RAWVIDEO:
663 case CODEC_ID_DVVIDEO:
664 case CODEC_ID_HUFFYUV:
665 case CODEC_ID_FFVHUFF:
676 static int64_t lsb2full(int64_t lsb, int64_t last_ts, int lsb_bits){
677 int64_t mask = lsb_bits < 64 ? (1LL<<lsb_bits)-1 : -1LL;
678 int64_t delta= last_ts - mask/2;
679 return ((lsb - delta)&mask) + delta;
682 static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
683 AVCodecParserContext *pc, AVPacket *pkt)
685 int num, den, presentation_delayed;
687 /* handle wrapping */
688 if(st->cur_dts != AV_NOPTS_VALUE){
689 if(pkt->pts != AV_NOPTS_VALUE)
690 pkt->pts= lsb2full(pkt->pts, st->cur_dts, st->pts_wrap_bits);
691 if(pkt->dts != AV_NOPTS_VALUE)
692 pkt->dts= lsb2full(pkt->dts, st->cur_dts, st->pts_wrap_bits);
695 if (pkt->duration == 0) {
696 compute_frame_duration(&num, &den, st, pc, pkt);
698 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
702 if(is_intra_only(&st->codec))
703 pkt->flags |= PKT_FLAG_KEY;
705 /* do we have a video B frame ? */
706 presentation_delayed = 0;
707 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
708 /* XXX: need has_b_frame, but cannot get it if the codec is
710 if (( st->codec.codec_id == CODEC_ID_H264
711 || st->codec.has_b_frames) &&
712 pc && pc->pict_type != FF_B_TYPE)
713 presentation_delayed = 1;
714 /* this may be redundant, but it shouldnt hurt */
715 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
716 presentation_delayed = 1;
719 if(st->cur_dts == AV_NOPTS_VALUE){
720 if(presentation_delayed) st->cur_dts = -pkt->duration;
721 else st->cur_dts = 0;
724 // av_log(NULL, AV_LOG_DEBUG, "IN delayed:%d pts:%lld, dts:%lld cur_dts:%lld st:%d pc:%p\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts, pkt->stream_index, pc);
725 /* interpolate PTS and DTS if they are not present */
726 if (presentation_delayed) {
727 /* DTS = decompression time stamp */
728 /* PTS = presentation time stamp */
729 if (pkt->dts == AV_NOPTS_VALUE) {
730 /* if we know the last pts, use it */
731 if(st->last_IP_pts != AV_NOPTS_VALUE)
732 st->cur_dts = pkt->dts = st->last_IP_pts;
734 pkt->dts = st->cur_dts;
736 st->cur_dts = pkt->dts;
738 /* this is tricky: the dts must be incremented by the duration
739 of the frame we are displaying, i.e. the last I or P frame */
740 if (st->last_IP_duration == 0)
741 st->cur_dts += pkt->duration;
743 st->cur_dts += st->last_IP_duration;
744 st->last_IP_duration = pkt->duration;
745 st->last_IP_pts= pkt->pts;
746 /* cannot compute PTS if not present (we can compute it only
747 by knowing the futur */
748 } else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
749 if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
750 int64_t old_diff= ABS(st->cur_dts - pkt->duration - pkt->pts);
751 int64_t new_diff= ABS(st->cur_dts - pkt->pts);
752 if(old_diff < new_diff && old_diff < (pkt->duration>>3)){
753 pkt->pts += pkt->duration;
754 // av_log(NULL, AV_LOG_DEBUG, "id:%d old:%Ld new:%Ld dur:%d cur:%Ld size:%d\n", pkt->stream_index, old_diff, new_diff, pkt->duration, st->cur_dts, pkt->size);
758 /* presentation is not delayed : PTS and DTS are the same */
759 if (pkt->pts == AV_NOPTS_VALUE) {
760 if (pkt->dts == AV_NOPTS_VALUE) {
761 pkt->pts = st->cur_dts;
762 pkt->dts = st->cur_dts;
765 st->cur_dts = pkt->dts;
769 st->cur_dts = pkt->pts;
772 st->cur_dts += pkt->duration;
774 // av_log(NULL, AV_LOG_DEBUG, "OUTdelayed:%d pts:%lld, dts:%lld cur_dts:%lld\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts);
779 /* key frame computation */
780 switch(st->codec.codec_type) {
781 case CODEC_TYPE_VIDEO:
782 if (pc->pict_type == FF_I_TYPE)
783 pkt->flags |= PKT_FLAG_KEY;
785 case CODEC_TYPE_AUDIO:
786 pkt->flags |= PKT_FLAG_KEY;
793 /* convert the packet time stamp units */
794 if(pkt->pts != AV_NOPTS_VALUE)
795 pkt->pts = av_rescale(pkt->pts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
796 if(pkt->dts != AV_NOPTS_VALUE)
797 pkt->dts = av_rescale(pkt->dts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
800 pkt->duration = av_rescale(pkt->duration, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
803 void av_destruct_packet_nofree(AVPacket *pkt)
805 pkt->data = NULL; pkt->size = 0;
808 static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
814 /* select current input stream component */
818 /* no parsing needed: we just output the packet as is */
819 /* raw data support */
821 compute_pkt_fields(s, st, NULL, pkt);
824 } else if (s->cur_len > 0 && st->discard < AVDISCARD_ALL) {
825 len = av_parser_parse(st->parser, &st->codec, &pkt->data, &pkt->size,
826 s->cur_ptr, s->cur_len,
827 s->cur_pkt.pts, s->cur_pkt.dts);
828 s->cur_pkt.pts = AV_NOPTS_VALUE;
829 s->cur_pkt.dts = AV_NOPTS_VALUE;
830 /* increment read pointer */
834 /* return packet if any */
838 pkt->stream_index = st->index;
839 pkt->pts = st->parser->pts;
840 pkt->dts = st->parser->dts;
841 pkt->destruct = av_destruct_packet_nofree;
842 compute_pkt_fields(s, st, st->parser, pkt);
847 av_free_packet(&s->cur_pkt);
851 /* read next packet */
852 ret = av_read_packet(s, &s->cur_pkt);
856 /* return the last frames, if any */
857 for(i = 0; i < s->nb_streams; i++) {
860 av_parser_parse(st->parser, &st->codec,
861 &pkt->data, &pkt->size,
863 AV_NOPTS_VALUE, AV_NOPTS_VALUE);
868 /* no more packets: really terminates parsing */
872 st = s->streams[s->cur_pkt.stream_index];
875 s->cur_ptr = s->cur_pkt.data;
876 s->cur_len = s->cur_pkt.size;
877 if (st->need_parsing && !st->parser) {
878 st->parser = av_parser_init(st->codec.codec_id);
880 /* no parser available : just output the raw packets */
881 st->need_parsing = 0;
889 * Return the next frame of a stream. The returned packet is valid
890 * until the next av_read_frame() or until av_close_input_file() and
891 * must be freed with av_free_packet. For video, the packet contains
892 * exactly one frame. For audio, it contains an integer number of
893 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
894 * data). If the audio frames have a variable size (e.g. MPEG audio),
895 * then it contains one frame.
897 * pkt->pts, pkt->dts and pkt->duration are always set to correct
898 * values in AV_TIME_BASE unit (and guessed if the format cannot
899 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
900 * has B frames, so it is better to rely on pkt->dts if you do not
901 * decompress the payload.
903 * Return 0 if OK, < 0 if error or end of file.
905 int av_read_frame(AVFormatContext *s, AVPacket *pkt)
909 pktl = s->packet_buffer;
911 /* read packet from packet buffer, if there is data */
913 s->packet_buffer = pktl->next;
917 return av_read_frame_internal(s, pkt);
921 /* XXX: suppress the packet queue */
922 static void flush_packet_queue(AVFormatContext *s)
927 pktl = s->packet_buffer;
930 s->packet_buffer = pktl->next;
931 av_free_packet(&pktl->pkt);
936 /*******************************************************/
939 int av_find_default_stream_index(AVFormatContext *s)
944 if (s->nb_streams <= 0)
946 for(i = 0; i < s->nb_streams; i++) {
948 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
955 /* flush the frame reader */
956 static void av_read_frame_flush(AVFormatContext *s)
961 flush_packet_queue(s);
963 /* free previous packet */
965 if (s->cur_st->parser)
966 av_free_packet(&s->cur_pkt);
973 /* for each stream, reset read state */
974 for(i = 0; i < s->nb_streams; i++) {
978 av_parser_close(st->parser);
981 st->last_IP_pts = AV_NOPTS_VALUE;
982 st->cur_dts = 0; /* we set the current DTS to an unspecified origin */
987 * updates cur_dts of all streams based on given timestamp and AVStream.
988 * stream ref_st unchanged, others set cur_dts in their native timebase
989 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
990 * @param timestamp new dts expressed in time_base of param ref_st
991 * @param ref_st reference stream giving time_base of param timestamp
993 static void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
996 for(i = 0; i < s->nb_streams; i++) {
997 AVStream *st = s->streams[i];
999 st->cur_dts = av_rescale(timestamp,
1000 st->time_base.den * (int64_t)ref_st->time_base.num,
1001 st->time_base.num * (int64_t)ref_st->time_base.den);
1006 * add a index entry into a sorted list updateing if it is already there.
1007 * @param timestamp timestamp in the timebase of the given stream
1009 int av_add_index_entry(AVStream *st,
1010 int64_t pos, int64_t timestamp, int distance, int flags)
1012 AVIndexEntry *entries, *ie;
1015 if((unsigned)st->nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1018 entries = av_fast_realloc(st->index_entries,
1019 &st->index_entries_allocated_size,
1020 (st->nb_index_entries + 1) *
1021 sizeof(AVIndexEntry));
1025 st->index_entries= entries;
1027 index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY);
1030 index= st->nb_index_entries++;
1031 ie= &entries[index];
1032 assert(index==0 || ie[-1].timestamp < timestamp);
1034 ie= &entries[index];
1035 if(ie->timestamp != timestamp){
1036 if(ie->timestamp <= timestamp)
1038 memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
1039 st->nb_index_entries++;
1040 }else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance
1041 distance= ie->min_distance;
1045 ie->timestamp = timestamp;
1046 ie->min_distance= distance;
1052 /* build an index for raw streams using a parser */
1053 static void av_build_index_raw(AVFormatContext *s)
1055 AVPacket pkt1, *pkt = &pkt1;
1060 av_read_frame_flush(s);
1061 url_fseek(&s->pb, s->data_offset, SEEK_SET);
1064 ret = av_read_frame(s, pkt);
1067 if (pkt->stream_index == 0 && st->parser &&
1068 (pkt->flags & PKT_FLAG_KEY)) {
1069 int64_t dts= av_rescale(pkt->dts, st->time_base.den, AV_TIME_BASE*(int64_t)st->time_base.num);
1070 av_add_index_entry(st, st->parser->frame_offset, dts,
1071 0, AVINDEX_KEYFRAME);
1073 av_free_packet(pkt);
1077 /* return TRUE if we deal with a raw stream (raw codec data and
1079 static int is_raw_stream(AVFormatContext *s)
1083 if (s->nb_streams != 1)
1086 if (!st->need_parsing)
1092 * gets the index for a specific timestamp.
1093 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
1094 * the timestamp which is <= the requested one, if backward is 0
1095 * then it will be >=
1096 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1097 * @return < 0 if no such timestamp could be found
1099 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
1102 AVIndexEntry *entries= st->index_entries;
1103 int nb_entries= st->nb_index_entries;
1112 timestamp = entries[m].timestamp;
1113 if(timestamp >= wanted_timestamp)
1115 if(timestamp <= wanted_timestamp)
1118 m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
1120 if(!(flags & AVSEEK_FLAG_ANY)){
1121 while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){
1122 m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
1134 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
1135 * this isnt supposed to be called directly by a user application, but by demuxers
1136 * @param target_ts target timestamp in the time base of the given stream
1137 * @param stream_index stream number
1139 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1140 AVInputFormat *avif= s->iformat;
1141 int64_t pos_min, pos_max, pos, pos_limit;
1142 int64_t ts_min, ts_max, ts;
1144 int index, no_change;
1147 if (stream_index < 0)
1151 av_log(s, AV_LOG_DEBUG, "read_seek: %d %lld\n", stream_index, target_ts);
1155 ts_min= AV_NOPTS_VALUE;
1156 pos_limit= -1; //gcc falsely says it may be uninitalized
1158 st= s->streams[stream_index];
1159 if(st->index_entries){
1162 index= av_index_search_timestamp(st, target_ts, flags | AVSEEK_FLAG_BACKWARD); //FIXME whole func must be checked for non keyframe entries in index case, especially read_timestamp()
1163 index= FFMAX(index, 0);
1164 e= &st->index_entries[index];
1166 if(e->timestamp <= target_ts || e->pos == e->min_distance){
1168 ts_min= e->timestamp;
1170 av_log(s, AV_LOG_DEBUG, "using cached pos_min=0x%llx dts_min=%lld\n",
1177 index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
1178 assert(index < st->nb_index_entries);
1180 e= &st->index_entries[index];
1181 assert(e->timestamp >= target_ts);
1183 ts_max= e->timestamp;
1184 pos_limit= pos_max - e->min_distance;
1186 av_log(s, AV_LOG_DEBUG, "using cached pos_max=0x%llx pos_limit=0x%llx dts_max=%lld\n",
1187 pos_max,pos_limit, ts_max);
1192 if(ts_min == AV_NOPTS_VALUE){
1193 pos_min = s->data_offset;
1194 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1195 if (ts_min == AV_NOPTS_VALUE)
1199 if(ts_max == AV_NOPTS_VALUE){
1201 pos_max = url_filesize(url_fileno(&s->pb)) - 1;
1204 ts_max = avif->read_timestamp(s, stream_index, &pos_max, pos_max + step);
1206 }while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
1207 if (ts_max == AV_NOPTS_VALUE)
1211 int64_t tmp_pos= pos_max + 1;
1212 int64_t tmp_ts= avif->read_timestamp(s, stream_index, &tmp_pos, INT64_MAX);
1213 if(tmp_ts == AV_NOPTS_VALUE)
1222 while (pos_min < pos_limit) {
1224 av_log(s, AV_LOG_DEBUG, "pos_min=0x%llx pos_max=0x%llx dts_min=%lld dts_max=%lld\n",
1228 assert(pos_limit <= pos_max);
1231 int64_t approximate_keyframe_distance= pos_max - pos_limit;
1232 // interpolate position (better than dichotomy)
1233 pos = av_rescale(target_ts - ts_min, pos_max - pos_min, ts_max - ts_min)
1234 + pos_min - approximate_keyframe_distance;
1235 }else if(no_change==1){
1236 // bisection, if interpolation failed to change min or max pos last time
1237 pos = (pos_min + pos_limit)>>1;
1239 // linear search if bisection failed, can only happen if there are very few or no keframes between min/max
1244 else if(pos > pos_limit)
1248 ts = avif->read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
1254 av_log(s, AV_LOG_DEBUG, "%Ld %Ld %Ld / %Ld %Ld %Ld target:%Ld limit:%Ld start:%Ld noc:%d\n", pos_min, pos, pos_max, ts_min, ts, ts_max, target_ts, pos_limit, start_pos, no_change);
1256 assert(ts != AV_NOPTS_VALUE);
1257 if (target_ts <= ts) {
1258 pos_limit = start_pos - 1;
1262 if (target_ts >= ts) {
1268 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
1269 ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
1272 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1274 ts_max = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1275 av_log(s, AV_LOG_DEBUG, "pos=0x%llx %lld<=%lld<=%lld\n",
1276 pos, ts_min, target_ts, ts_max);
1279 url_fseek(&s->pb, pos, SEEK_SET);
1281 av_update_cur_dts(s, st, ts);
1286 static int av_seek_frame_byte(AVFormatContext *s, int stream_index, int64_t pos, int flags){
1287 int64_t pos_min, pos_max;
1291 if (stream_index < 0)
1294 st= s->streams[stream_index];
1297 pos_min = s->data_offset;
1298 pos_max = url_filesize(url_fileno(&s->pb)) - 1;
1300 if (pos < pos_min) pos= pos_min;
1301 else if(pos > pos_max) pos= pos_max;
1303 url_fseek(&s->pb, pos, SEEK_SET);
1306 av_update_cur_dts(s, st, ts);
1311 static int av_seek_frame_generic(AVFormatContext *s,
1312 int stream_index, int64_t timestamp, int flags)
1318 if (!s->index_built) {
1319 if (is_raw_stream(s)) {
1320 av_build_index_raw(s);
1327 st = s->streams[stream_index];
1328 index = av_index_search_timestamp(st, timestamp, flags);
1332 /* now we have found the index, we can seek */
1333 ie = &st->index_entries[index];
1334 av_read_frame_flush(s);
1335 url_fseek(&s->pb, ie->pos, SEEK_SET);
1337 av_update_cur_dts(s, st, ie->timestamp);
1343 * Seek to the key frame at timestamp.
1344 * 'timestamp' in 'stream_index'.
1345 * @param stream_index If stream_index is (-1), a default
1346 * stream is selected, and timestamp is automatically converted
1347 * from AV_TIME_BASE units to the stream specific time_base.
1348 * @param timestamp timestamp in AVStream.time_base units
1349 * @param flags flags which select direction and seeking mode
1350 * @return >= 0 on success
1352 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1357 av_read_frame_flush(s);
1359 if(flags & AVSEEK_FLAG_BYTE)
1360 return av_seek_frame_byte(s, stream_index, timestamp, flags);
1362 if(stream_index < 0){
1363 stream_index= av_find_default_stream_index(s);
1364 if(stream_index < 0)
1367 st= s->streams[stream_index];
1368 /* timestamp for default must be expressed in AV_TIME_BASE units */
1369 timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
1371 st= s->streams[stream_index];
1373 /* first, we try the format specific seek */
1374 if (s->iformat->read_seek)
1375 ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
1382 if(s->iformat->read_timestamp)
1383 return av_seek_frame_binary(s, stream_index, timestamp, flags);
1385 return av_seek_frame_generic(s, stream_index, timestamp, flags);
1388 /*******************************************************/
1390 /* return TRUE if the stream has accurate timings for at least one component */
1391 static int av_has_timings(AVFormatContext *ic)
1396 for(i = 0;i < ic->nb_streams; i++) {
1397 st = ic->streams[i];
1398 if (st->start_time != AV_NOPTS_VALUE &&
1399 st->duration != AV_NOPTS_VALUE)
1405 /* estimate the stream timings from the one of each components. Also
1406 compute the global bitrate if possible */
1407 static void av_update_stream_timings(AVFormatContext *ic)
1409 int64_t start_time, end_time, end_time1;
1413 start_time = MAXINT64;
1414 end_time = MININT64;
1415 for(i = 0;i < ic->nb_streams; i++) {
1416 st = ic->streams[i];
1417 if (st->start_time != AV_NOPTS_VALUE) {
1418 if (st->start_time < start_time)
1419 start_time = st->start_time;
1420 if (st->duration != AV_NOPTS_VALUE) {
1421 end_time1 = st->start_time + st->duration;
1422 if (end_time1 > end_time)
1423 end_time = end_time1;
1427 if (start_time != MAXINT64) {
1428 ic->start_time = start_time;
1429 if (end_time != MAXINT64) {
1430 ic->duration = end_time - start_time;
1431 if (ic->file_size > 0) {
1432 /* compute the bit rate */
1433 ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
1434 (double)ic->duration;
1441 static void fill_all_stream_timings(AVFormatContext *ic)
1446 av_update_stream_timings(ic);
1447 for(i = 0;i < ic->nb_streams; i++) {
1448 st = ic->streams[i];
1449 if (st->start_time == AV_NOPTS_VALUE) {
1450 st->start_time = ic->start_time;
1451 st->duration = ic->duration;
1456 static void av_estimate_timings_from_bit_rate(AVFormatContext *ic)
1458 int64_t filesize, duration;
1462 /* if bit_rate is already set, we believe it */
1463 if (ic->bit_rate == 0) {
1465 for(i=0;i<ic->nb_streams;i++) {
1466 st = ic->streams[i];
1467 bit_rate += st->codec.bit_rate;
1469 ic->bit_rate = bit_rate;
1472 /* if duration is already set, we believe it */
1473 if (ic->duration == AV_NOPTS_VALUE &&
1474 ic->bit_rate != 0 &&
1475 ic->file_size != 0) {
1476 filesize = ic->file_size;
1478 duration = (int64_t)((8 * AV_TIME_BASE * (double)filesize) / (double)ic->bit_rate);
1479 for(i = 0; i < ic->nb_streams; i++) {
1480 st = ic->streams[i];
1481 if (st->start_time == AV_NOPTS_VALUE ||
1482 st->duration == AV_NOPTS_VALUE) {
1484 st->duration = duration;
1491 #define DURATION_MAX_READ_SIZE 250000
1493 /* only usable for MPEG-PS streams */
1494 static void av_estimate_timings_from_pts(AVFormatContext *ic)
1496 AVPacket pkt1, *pkt = &pkt1;
1498 int read_size, i, ret;
1499 int64_t start_time, end_time, end_time1;
1500 int64_t filesize, offset, duration;
1502 /* free previous packet */
1503 if (ic->cur_st && ic->cur_st->parser)
1504 av_free_packet(&ic->cur_pkt);
1507 /* flush packet queue */
1508 flush_packet_queue(ic);
1510 for(i=0;i<ic->nb_streams;i++) {
1511 st = ic->streams[i];
1513 av_parser_close(st->parser);
1518 /* we read the first packets to get the first PTS (not fully
1519 accurate, but it is enough now) */
1520 url_fseek(&ic->pb, 0, SEEK_SET);
1523 if (read_size >= DURATION_MAX_READ_SIZE)
1525 /* if all info is available, we can stop */
1526 for(i = 0;i < ic->nb_streams; i++) {
1527 st = ic->streams[i];
1528 if (st->start_time == AV_NOPTS_VALUE)
1531 if (i == ic->nb_streams)
1534 ret = av_read_packet(ic, pkt);
1537 read_size += pkt->size;
1538 st = ic->streams[pkt->stream_index];
1539 if (pkt->pts != AV_NOPTS_VALUE) {
1540 if (st->start_time == AV_NOPTS_VALUE)
1541 st->start_time = av_rescale(pkt->pts, st->time_base.num * (int64_t)AV_TIME_BASE, st->time_base.den);
1543 av_free_packet(pkt);
1546 /* we compute the minimum start_time and use it as default */
1547 start_time = MAXINT64;
1548 for(i = 0; i < ic->nb_streams; i++) {
1549 st = ic->streams[i];
1550 if (st->start_time != AV_NOPTS_VALUE &&
1551 st->start_time < start_time)
1552 start_time = st->start_time;
1554 if (start_time != MAXINT64)
1555 ic->start_time = start_time;
1557 /* estimate the end time (duration) */
1558 /* XXX: may need to support wrapping */
1559 filesize = ic->file_size;
1560 offset = filesize - DURATION_MAX_READ_SIZE;
1564 url_fseek(&ic->pb, offset, SEEK_SET);
1567 if (read_size >= DURATION_MAX_READ_SIZE)
1569 /* if all info is available, we can stop */
1570 for(i = 0;i < ic->nb_streams; i++) {
1571 st = ic->streams[i];
1572 if (st->duration == AV_NOPTS_VALUE)
1575 if (i == ic->nb_streams)
1578 ret = av_read_packet(ic, pkt);
1581 read_size += pkt->size;
1582 st = ic->streams[pkt->stream_index];
1583 if (pkt->pts != AV_NOPTS_VALUE) {
1584 end_time = av_rescale(pkt->pts, st->time_base.num * (int64_t)AV_TIME_BASE, st->time_base.den);
1585 duration = end_time - st->start_time;
1587 if (st->duration == AV_NOPTS_VALUE ||
1588 st->duration < duration)
1589 st->duration = duration;
1592 av_free_packet(pkt);
1595 /* estimate total duration */
1596 end_time = MININT64;
1597 for(i = 0;i < ic->nb_streams; i++) {
1598 st = ic->streams[i];
1599 if (st->duration != AV_NOPTS_VALUE) {
1600 end_time1 = st->start_time + st->duration;
1601 if (end_time1 > end_time)
1602 end_time = end_time1;
1606 /* update start_time (new stream may have been created, so we do
1608 if (ic->start_time != AV_NOPTS_VALUE) {
1609 for(i = 0; i < ic->nb_streams; i++) {
1610 st = ic->streams[i];
1611 if (st->start_time == AV_NOPTS_VALUE)
1612 st->start_time = ic->start_time;
1616 if (end_time != MININT64) {
1617 /* put dummy values for duration if needed */
1618 for(i = 0;i < ic->nb_streams; i++) {
1619 st = ic->streams[i];
1620 if (st->duration == AV_NOPTS_VALUE &&
1621 st->start_time != AV_NOPTS_VALUE)
1622 st->duration = end_time - st->start_time;
1624 ic->duration = end_time - ic->start_time;
1627 url_fseek(&ic->pb, 0, SEEK_SET);
1630 static void av_estimate_timings(AVFormatContext *ic)
1635 /* get the file size, if possible */
1636 if (ic->iformat->flags & AVFMT_NOFILE) {
1639 h = url_fileno(&ic->pb);
1640 file_size = url_filesize(h);
1644 ic->file_size = file_size;
1646 if ((ic->iformat == &mpegps_demux || ic->iformat == &mpegts_demux) && file_size && !ic->pb.is_streamed) {
1647 /* get accurate estimate from the PTSes */
1648 av_estimate_timings_from_pts(ic);
1649 } else if (av_has_timings(ic)) {
1650 /* at least one components has timings - we use them for all
1652 fill_all_stream_timings(ic);
1654 /* less precise: use bit rate info */
1655 av_estimate_timings_from_bit_rate(ic);
1657 av_update_stream_timings(ic);
1663 for(i = 0;i < ic->nb_streams; i++) {
1664 st = ic->streams[i];
1665 printf("%d: start_time: %0.3f duration: %0.3f\n",
1666 i, (double)st->start_time / AV_TIME_BASE,
1667 (double)st->duration / AV_TIME_BASE);
1669 printf("stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
1670 (double)ic->start_time / AV_TIME_BASE,
1671 (double)ic->duration / AV_TIME_BASE,
1672 ic->bit_rate / 1000);
1677 static int has_codec_parameters(AVCodecContext *enc)
1680 switch(enc->codec_type) {
1681 case CODEC_TYPE_AUDIO:
1682 val = enc->sample_rate;
1684 case CODEC_TYPE_VIDEO:
1694 static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
1698 int got_picture, ret;
1701 codec = avcodec_find_decoder(st->codec.codec_id);
1704 ret = avcodec_open(&st->codec, codec);
1707 switch(st->codec.codec_type) {
1708 case CODEC_TYPE_VIDEO:
1709 ret = avcodec_decode_video(&st->codec, &picture,
1710 &got_picture, (uint8_t *)data, size);
1712 case CODEC_TYPE_AUDIO:
1713 samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
1716 ret = avcodec_decode_audio(&st->codec, samples,
1717 &got_picture, (uint8_t *)data, size);
1724 avcodec_close(&st->codec);
1728 /* absolute maximum size we read until we abort */
1729 #define MAX_READ_SIZE 5000000
1731 /* maximum duration until we stop analysing the stream */
1732 #define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 1.0))
1735 * Read the beginning of a media file to get stream information. This
1736 * is useful for file formats with no headers such as MPEG. This
1737 * function also compute the real frame rate in case of mpeg2 repeat
1740 * @param ic media file handle
1741 * @return >=0 if OK. AVERROR_xxx if error.
1743 int av_find_stream_info(AVFormatContext *ic)
1745 int i, count, ret, read_size;
1747 AVPacket pkt1, *pkt;
1748 AVPacketList *pktl=NULL, **ppktl;
1749 int64_t last_dts[MAX_STREAMS];
1750 int64_t best_duration[MAX_STREAMS];
1752 for(i=0;i<MAX_STREAMS;i++){
1753 last_dts[i]= AV_NOPTS_VALUE;
1754 best_duration[i]= INT64_MAX;
1759 ppktl = &ic->packet_buffer;
1761 /* check if one codec still needs to be handled */
1762 for(i=0;i<ic->nb_streams;i++) {
1763 st = ic->streams[i];
1764 if (!has_codec_parameters(&st->codec))
1766 /* variable fps and no guess at the real fps */
1767 if( st->codec.frame_rate >= 1000LL*st->codec.frame_rate_base
1768 && best_duration[i]== INT64_MAX)
1771 if (i == ic->nb_streams) {
1772 /* NOTE: if the format has no header, then we need to read
1773 some packets to get most of the streams, so we cannot
1775 if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
1776 /* if we found the info for all the codecs, we can stop */
1781 /* we did not get all the codec info, but we read too much data */
1782 if (read_size >= MAX_READ_SIZE) {
1788 /* NOTE: a new stream can be added there if no header in file
1789 (AVFMTCTX_NOHEADER) */
1790 ret = av_read_frame_internal(ic, &pkt1);
1793 ret = -1; /* we could not have all the codec parameters before EOF */
1794 for(i=0;i<ic->nb_streams;i++) {
1795 st = ic->streams[i];
1796 if (!has_codec_parameters(&st->codec))
1799 if ((ic->ctx_flags & AVFMTCTX_NOHEADER) &&
1800 i == ic->nb_streams)
1805 pktl = av_mallocz(sizeof(AVPacketList));
1807 ret = AVERROR_NOMEM;
1811 /* add the packet in the buffered packet list */
1813 ppktl = &pktl->next;
1818 /* duplicate the packet */
1819 if (av_dup_packet(pkt) < 0) {
1820 ret = AVERROR_NOMEM;
1824 read_size += pkt->size;
1826 st = ic->streams[pkt->stream_index];
1827 st->codec_info_duration += pkt->duration;
1828 if (pkt->duration != 0)
1829 st->codec_info_nb_frames++;
1831 if(st->codec.codec_type == CODEC_TYPE_VIDEO){
1832 int64_t last= last_dts[pkt->stream_index];
1834 if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && last < pkt->dts &&
1835 best_duration[pkt->stream_index] > pkt->dts - last){
1836 best_duration[pkt->stream_index] = pkt->dts - last;
1838 last_dts[pkt->stream_index]= pkt->dts;
1840 /* if still no information, we try to open the codec and to
1841 decompress the frame. We try to avoid that in most cases as
1842 it takes longer and uses more memory. For MPEG4, we need to
1843 decompress for Quicktime. */
1844 if (!has_codec_parameters(&st->codec) &&
1845 (st->codec.codec_id == CODEC_ID_FLV1 ||
1846 st->codec.codec_id == CODEC_ID_H264 ||
1847 st->codec.codec_id == CODEC_ID_H263 ||
1848 st->codec.codec_id == CODEC_ID_H261 ||
1849 st->codec.codec_id == CODEC_ID_VORBIS ||
1850 st->codec.codec_id == CODEC_ID_MJPEG ||
1851 st->codec.codec_id == CODEC_ID_PNG ||
1852 st->codec.codec_id == CODEC_ID_PAM ||
1853 st->codec.codec_id == CODEC_ID_PGM ||
1854 st->codec.codec_id == CODEC_ID_PGMYUV ||
1855 st->codec.codec_id == CODEC_ID_PBM ||
1856 st->codec.codec_id == CODEC_ID_PPM ||
1857 st->codec.codec_id == CODEC_ID_SHORTEN ||
1858 (st->codec.codec_id == CODEC_ID_MPEG4 && !st->need_parsing)))
1859 try_decode_frame(st, pkt->data, pkt->size);
1861 if (st->codec_info_duration >= MAX_STREAM_DURATION) {
1867 for(i=0;i<ic->nb_streams;i++) {
1868 st = ic->streams[i];
1869 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
1870 if(st->codec.codec_id == CODEC_ID_RAWVIDEO && !st->codec.codec_tag && !st->codec.bits_per_sample)
1871 st->codec.codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec.pix_fmt);
1873 if(best_duration[i] < INT64_MAX && st->codec.frame_rate_base*1000 <= st->codec.frame_rate){
1876 st->r_frame_rate= st->codec.frame_rate;
1877 st->r_frame_rate_base= av_rescale(best_duration[i], st->codec.frame_rate, AV_TIME_BASE);
1878 av_reduce(&st->r_frame_rate, &st->r_frame_rate_base, st->r_frame_rate, st->r_frame_rate_base, 1<<15);
1880 int_fps= av_rescale(st->r_frame_rate, 1, st->r_frame_rate_base);
1882 if(int_fps>0 && av_rescale(st->r_frame_rate, 1, int_fps) == st->r_frame_rate_base){
1883 st->r_frame_rate= int_fps;
1884 st->r_frame_rate_base= 1;
1888 /* set real frame rate info */
1889 /* compute the real frame rate for telecine */
1890 if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO ||
1891 st->codec.codec_id == CODEC_ID_MPEG2VIDEO) &&
1892 st->codec.sub_id == 2) {
1893 if (st->codec_info_nb_frames >= 20) {
1894 float coded_frame_rate, est_frame_rate;
1895 est_frame_rate = ((double)st->codec_info_nb_frames * AV_TIME_BASE) /
1896 (double)st->codec_info_duration ;
1897 coded_frame_rate = (double)st->codec.frame_rate /
1898 (double)st->codec.frame_rate_base;
1900 printf("telecine: coded_frame_rate=%0.3f est_frame_rate=%0.3f\n",
1901 coded_frame_rate, est_frame_rate);
1903 /* if we detect that it could be a telecine, we
1904 signal it. It would be better to do it at a
1905 higher level as it can change in a film */
1906 if (coded_frame_rate >= 24.97 &&
1907 (est_frame_rate >= 23.5 && est_frame_rate < 24.5)) {
1908 st->r_frame_rate = 24000;
1909 st->r_frame_rate_base = 1001;
1913 /* if no real frame rate, use the codec one */
1914 if (!st->r_frame_rate){
1915 st->r_frame_rate = st->codec.frame_rate;
1916 st->r_frame_rate_base = st->codec.frame_rate_base;
1921 av_estimate_timings(ic);
1923 /* correct DTS for b frame streams with no timestamps */
1924 for(i=0;i<ic->nb_streams;i++) {
1925 st = ic->streams[i];
1926 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
1928 ppktl = &ic->packet_buffer;
1930 if(ppkt1->stream_index != i)
1932 if(ppkt1->pkt->dts < 0)
1934 if(ppkt1->pkt->pts != AV_NOPTS_VALUE)
1936 ppkt1->pkt->dts -= delta;
1941 st->cur_dts -= delta;
1949 /*******************************************************/
1952 * start playing a network based stream (e.g. RTSP stream) at the
1955 int av_read_play(AVFormatContext *s)
1957 if (!s->iformat->read_play)
1958 return AVERROR_NOTSUPP;
1959 return s->iformat->read_play(s);
1963 * pause a network based stream (e.g. RTSP stream). Use av_read_play()
1966 int av_read_pause(AVFormatContext *s)
1968 if (!s->iformat->read_pause)
1969 return AVERROR_NOTSUPP;
1970 return s->iformat->read_pause(s);
1974 * Close a media file (but not its codecs)
1976 * @param s media file handle
1978 void av_close_input_file(AVFormatContext *s)
1980 int i, must_open_file;
1983 /* free previous packet */
1984 if (s->cur_st && s->cur_st->parser)
1985 av_free_packet(&s->cur_pkt);
1987 if (s->iformat->read_close)
1988 s->iformat->read_close(s);
1989 for(i=0;i<s->nb_streams;i++) {
1990 /* free all data in a stream component */
1993 av_parser_close(st->parser);
1995 av_free(st->index_entries);
1998 flush_packet_queue(s);
2000 if (s->iformat->flags & AVFMT_NOFILE) {
2003 if (must_open_file) {
2006 av_freep(&s->priv_data);
2011 * Add a new stream to a media file. Can only be called in the
2012 * read_header function. If the flag AVFMTCTX_NOHEADER is in the
2013 * format context, then new streams can be added in read_packet too.
2016 * @param s media file handle
2017 * @param id file format dependent stream id
2019 AVStream *av_new_stream(AVFormatContext *s, int id)
2023 if (s->nb_streams >= MAX_STREAMS)
2026 st = av_mallocz(sizeof(AVStream));
2029 avcodec_get_context_defaults(&st->codec);
2031 /* no default bitrate if decoding */
2032 st->codec.bit_rate = 0;
2034 st->index = s->nb_streams;
2036 st->start_time = AV_NOPTS_VALUE;
2037 st->duration = AV_NOPTS_VALUE;
2038 st->cur_dts = AV_NOPTS_VALUE;
2040 /* default pts settings is MPEG like */
2041 av_set_pts_info(st, 33, 1, 90000);
2042 st->last_IP_pts = AV_NOPTS_VALUE;
2044 s->streams[s->nb_streams++] = st;
2048 /************************************************************/
2049 /* output media file */
2051 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
2055 if (s->oformat->priv_data_size > 0) {
2056 s->priv_data = av_mallocz(s->oformat->priv_data_size);
2058 return AVERROR_NOMEM;
2060 s->priv_data = NULL;
2062 if (s->oformat->set_parameters) {
2063 ret = s->oformat->set_parameters(s, ap);
2071 * allocate the stream private data and write the stream header to an
2074 * @param s media file handle
2075 * @return 0 if OK. AVERROR_xxx if error.
2077 int av_write_header(AVFormatContext *s)
2082 ret = s->oformat->write_header(s);
2086 /* init PTS generation */
2087 for(i=0;i<s->nb_streams;i++) {
2090 switch (st->codec.codec_type) {
2091 case CODEC_TYPE_AUDIO:
2092 av_frac_init(&st->pts, 0, 0,
2093 (int64_t)st->time_base.num * st->codec.sample_rate);
2095 case CODEC_TYPE_VIDEO:
2096 av_frac_init(&st->pts, 0, 0,
2097 (int64_t)st->time_base.num * st->codec.frame_rate);
2106 //FIXME merge with compute_pkt_fields
2107 static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){
2108 int b_frames = FFMAX(st->codec.has_b_frames, st->codec.max_b_frames);
2109 int num, den, frame_size;
2111 // av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts:%lld dts:%lld cur_dts:%lld b:%d size:%d st:%d\n", pkt->pts, pkt->dts, st->cur_dts, b_frames, pkt->size, pkt->stream_index);
2113 /* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
2116 if(pkt->pts != AV_NOPTS_VALUE)
2117 pkt->pts = av_rescale(pkt->pts, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
2118 if(pkt->dts != AV_NOPTS_VALUE)
2119 pkt->dts = av_rescale(pkt->dts, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
2121 /* duration field */
2122 pkt->duration = av_rescale(pkt->duration, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
2123 if (pkt->duration == 0) {
2124 compute_frame_duration(&num, &den, st, NULL, pkt);
2126 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
2130 //XXX/FIXME this is a temporary hack until all encoders output pts
2131 if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !b_frames){
2133 // pkt->pts= st->cur_dts;
2134 pkt->pts= st->pts.val;
2137 //calculate dts from pts
2138 if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE){
2140 if(st->last_IP_pts == AV_NOPTS_VALUE){
2141 st->last_IP_pts= -pkt->duration;
2143 if(st->last_IP_pts < pkt->pts){
2144 pkt->dts= st->last_IP_pts;
2145 st->last_IP_pts= pkt->pts;
2152 if(st->cur_dts && st->cur_dts != AV_NOPTS_VALUE && st->cur_dts >= pkt->dts){
2153 av_log(NULL, AV_LOG_ERROR, "error, non monotone timestamps %Ld >= %Ld\n", st->cur_dts, pkt->dts);
2156 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
2157 av_log(NULL, AV_LOG_ERROR, "error, pts < dts\n");
2161 // av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts2:%lld dts2:%lld\n", pkt->pts, pkt->dts);
2162 st->cur_dts= pkt->dts;
2163 st->pts.val= pkt->dts;
2166 switch (st->codec.codec_type) {
2167 case CODEC_TYPE_AUDIO:
2168 frame_size = get_audio_frame_size(&st->codec, pkt->size);
2170 /* HACK/FIXME, we skip the initial 0-size packets as they are most likely equal to the encoder delay,
2171 but it would be better if we had the real timestamps from the encoder */
2172 if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) {
2173 av_frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
2176 case CODEC_TYPE_VIDEO:
2177 av_frac_add(&st->pts, (int64_t)st->time_base.den * st->codec.frame_rate_base);
2185 static void truncate_ts(AVStream *st, AVPacket *pkt){
2186 int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1;
2189 // pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
2191 pkt->pts &= pts_mask;
2192 pkt->dts &= pts_mask;
2196 * Write a packet to an output media file. The packet shall contain
2197 * one audio or video frame.
2199 * @param s media file handle
2200 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2201 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2203 int av_write_frame(AVFormatContext *s, AVPacket *pkt)
2207 ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt);
2211 truncate_ts(s->streams[pkt->stream_index], pkt);
2213 ret= s->oformat->write_packet(s, pkt);
2215 ret= url_ferror(&s->pb);
2220 * interleave_packet implementation which will interleave per DTS.
2222 static int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush){
2223 AVPacketList *pktl, **next_point, *this_pktl;
2225 int streams[MAX_STREAMS];
2228 AVStream *st= s->streams[ pkt->stream_index];
2230 assert(pkt->destruct != av_destruct_packet); //FIXME
2232 this_pktl = av_mallocz(sizeof(AVPacketList));
2233 this_pktl->pkt= *pkt;
2234 av_dup_packet(&this_pktl->pkt);
2236 next_point = &s->packet_buffer;
2238 AVStream *st2= s->streams[ (*next_point)->pkt.stream_index];
2239 int64_t left= st2->time_base.num * (int64_t)st ->time_base.den;
2240 int64_t right= st ->time_base.num * (int64_t)st2->time_base.den;
2241 if((*next_point)->pkt.dts * left > pkt->dts * right) //FIXME this can overflow
2243 next_point= &(*next_point)->next;
2245 this_pktl->next= *next_point;
2246 *next_point= this_pktl;
2249 memset(streams, 0, sizeof(streams));
2250 pktl= s->packet_buffer;
2252 //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
2253 if(streams[ pktl->pkt.stream_index ] == 0)
2255 streams[ pktl->pkt.stream_index ]++;
2259 if(s->nb_streams == stream_count || (flush && stream_count)){
2260 pktl= s->packet_buffer;
2263 s->packet_buffer= pktl->next;
2267 av_init_packet(out);
2273 * Interleaves a AVPacket correctly so it can be muxed.
2274 * @param out the interleaved packet will be output here
2275 * @param in the input packet
2276 * @param flush 1 if no further packets are available as input and all
2277 * remaining packets should be output
2278 * @return 1 if a packet was output, 0 if no packet could be output,
2279 * < 0 if an error occured
2281 static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
2282 if(s->oformat->interleave_packet)
2283 return s->oformat->interleave_packet(s, out, in, flush);
2285 return av_interleave_packet_per_dts(s, out, in, flush);
2289 * Writes a packet to an output media file ensuring correct interleaving.
2290 * The packet shall contain one audio or video frame.
2291 * If the packets are already correctly interleaved the application should
2292 * call av_write_frame() instead as its slightly faster, its also important
2293 * to keep in mind that completly non interleaved input will need huge amounts
2294 * of memory to interleave with this, so its prefereable to interleave at the
2297 * @param s media file handle
2298 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2299 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2301 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
2302 AVStream *st= s->streams[ pkt->stream_index];
2304 //FIXME/XXX/HACK drop zero sized packets
2305 if(st->codec.codec_type == CODEC_TYPE_AUDIO && pkt->size==0)
2308 //av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %Ld %Ld\n", pkt->size, pkt->dts, pkt->pts);
2309 if(compute_pkt_fields2(st, pkt) < 0)
2312 if(pkt->dts == AV_NOPTS_VALUE)
2317 int ret= av_interleave_packet(s, &opkt, pkt, 0);
2318 if(ret<=0) //FIXME cleanup needed for ret<0 ?
2321 truncate_ts(s->streams[opkt.stream_index], &opkt);
2322 ret= s->oformat->write_packet(s, &opkt);
2324 av_free_packet(&opkt);
2329 if(url_ferror(&s->pb))
2330 return url_ferror(&s->pb);
2335 * write the stream trailer to an output media file and and free the
2336 * file private data.
2338 * @param s media file handle
2339 * @return 0 if OK. AVERROR_xxx if error. */
2340 int av_write_trailer(AVFormatContext *s)
2346 ret= av_interleave_packet(s, &pkt, NULL, 1);
2347 if(ret<0) //FIXME cleanup needed for ret<0 ?
2352 truncate_ts(s->streams[pkt.stream_index], &pkt);
2353 ret= s->oformat->write_packet(s, &pkt);
2355 av_free_packet(&pkt);
2359 if(url_ferror(&s->pb))
2363 ret = s->oformat->write_trailer(s);
2366 ret=url_ferror(&s->pb);
2367 for(i=0;i<s->nb_streams;i++)
2368 av_freep(&s->streams[i]->priv_data);
2369 av_freep(&s->priv_data);
2373 /* "user interface" functions */
2375 void dump_format(AVFormatContext *ic,
2383 av_log(NULL, AV_LOG_DEBUG, "%s #%d, %s, %s '%s':\n",
2384 is_output ? "Output" : "Input",
2386 is_output ? ic->oformat->name : ic->iformat->name,
2387 is_output ? "to" : "from", url);
2389 av_log(NULL, AV_LOG_DEBUG, " Duration: ");
2390 if (ic->duration != AV_NOPTS_VALUE) {
2391 int hours, mins, secs, us;
2392 secs = ic->duration / AV_TIME_BASE;
2393 us = ic->duration % AV_TIME_BASE;
2398 av_log(NULL, AV_LOG_DEBUG, "%02d:%02d:%02d.%01d", hours, mins, secs,
2399 (10 * us) / AV_TIME_BASE);
2401 av_log(NULL, AV_LOG_DEBUG, "N/A");
2403 if (ic->start_time != AV_NOPTS_VALUE) {
2405 av_log(NULL, AV_LOG_DEBUG, ", start: ");
2406 secs = ic->start_time / AV_TIME_BASE;
2407 us = ic->start_time % AV_TIME_BASE;
2408 av_log(NULL, AV_LOG_DEBUG, "%d.%06d",
2409 secs, (int)av_rescale(us, 1000000, AV_TIME_BASE));
2411 av_log(NULL, AV_LOG_DEBUG, ", bitrate: ");
2413 av_log(NULL, AV_LOG_DEBUG,"%d kb/s", ic->bit_rate / 1000);
2415 av_log(NULL, AV_LOG_DEBUG, "N/A");
2417 av_log(NULL, AV_LOG_DEBUG, "\n");
2419 for(i=0;i<ic->nb_streams;i++) {
2420 AVStream *st = ic->streams[i];
2421 avcodec_string(buf, sizeof(buf), &st->codec, is_output);
2422 av_log(NULL, AV_LOG_DEBUG, " Stream #%d.%d", index, i);
2423 /* the pid is an important information, so we display it */
2424 /* XXX: add a generic system */
2426 flags = ic->oformat->flags;
2428 flags = ic->iformat->flags;
2429 if (flags & AVFMT_SHOW_IDS) {
2430 av_log(NULL, AV_LOG_DEBUG, "[0x%x]", st->id);
2432 av_log(NULL, AV_LOG_DEBUG, ": %s\n", buf);
2439 int frame_rate, frame_rate_base;
2442 static AbvEntry frame_abvs[] = {
2443 { "ntsc", 720, 480, 30000, 1001 },
2444 { "pal", 720, 576, 25, 1 },
2445 { "qntsc", 352, 240, 30000, 1001 }, /* VCD compliant ntsc */
2446 { "qpal", 352, 288, 25, 1 }, /* VCD compliant pal */
2447 { "sntsc", 640, 480, 30000, 1001 }, /* square pixel ntsc */
2448 { "spal", 768, 576, 25, 1 }, /* square pixel pal */
2449 { "film", 352, 240, 24, 1 },
2450 { "ntsc-film", 352, 240, 24000, 1001 },
2451 { "sqcif", 128, 96, 0, 0 },
2452 { "qcif", 176, 144, 0, 0 },
2453 { "cif", 352, 288, 0, 0 },
2454 { "4cif", 704, 576, 0, 0 },
2457 int parse_image_size(int *width_ptr, int *height_ptr, const char *str)
2460 int n = sizeof(frame_abvs) / sizeof(AbvEntry);
2462 int frame_width = 0, frame_height = 0;
2465 if (!strcmp(frame_abvs[i].abv, str)) {
2466 frame_width = frame_abvs[i].width;
2467 frame_height = frame_abvs[i].height;
2473 frame_width = strtol(p, (char **)&p, 10);
2476 frame_height = strtol(p, (char **)&p, 10);
2478 if (frame_width <= 0 || frame_height <= 0)
2480 *width_ptr = frame_width;
2481 *height_ptr = frame_height;
2485 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg)
2490 /* First, we check our abbreviation table */
2491 for (i = 0; i < sizeof(frame_abvs)/sizeof(*frame_abvs); ++i)
2492 if (!strcmp(frame_abvs[i].abv, arg)) {
2493 *frame_rate = frame_abvs[i].frame_rate;
2494 *frame_rate_base = frame_abvs[i].frame_rate_base;
2498 /* Then, we try to parse it as fraction */
2499 cp = strchr(arg, '/');
2501 cp = strchr(arg, ':');
2504 *frame_rate = strtol(arg, &cpp, 10);
2505 if (cpp != arg || cpp == cp)
2506 *frame_rate_base = strtol(cp+1, &cpp, 10);
2511 /* Finally we give up and parse it as double */
2512 *frame_rate_base = DEFAULT_FRAME_RATE_BASE; //FIXME use av_d2q()
2513 *frame_rate = (int)(strtod(arg, 0) * (*frame_rate_base) + 0.5);
2515 if (!*frame_rate || !*frame_rate_base)
2522 * - If not a duration:
2523 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
2524 * Time is localtime unless Z is suffixed to the end. In this case GMT
2525 * Return the date in micro seconds since 1970
2527 * HH[:MM[:SS[.m...]]]
2530 int64_t parse_date(const char *datestr, int duration)
2536 static const char *date_fmt[] = {
2540 static const char *time_fmt[] = {
2550 time_t now = time(0);
2552 len = strlen(datestr);
2554 lastch = datestr[len - 1];
2557 is_utc = (lastch == 'z' || lastch == 'Z');
2559 memset(&dt, 0, sizeof(dt));
2564 for (i = 0; i < sizeof(date_fmt) / sizeof(date_fmt[0]); i++) {
2565 q = small_strptime(p, date_fmt[i], &dt);
2575 dt = *localtime(&now);
2577 dt.tm_hour = dt.tm_min = dt.tm_sec = 0;
2582 if (*p == 'T' || *p == 't' || *p == ' ')
2585 for (i = 0; i < sizeof(time_fmt) / sizeof(time_fmt[0]); i++) {
2586 q = small_strptime(p, time_fmt[i], &dt);
2596 q = small_strptime(p, time_fmt[0], &dt);
2598 dt.tm_sec = strtol(p, (char **)&q, 10);
2604 /* Now we have all the fields that we can get */
2609 return now * int64_t_C(1000000);
2613 t = dt.tm_hour * 3600 + dt.tm_min * 60 + dt.tm_sec;
2615 dt.tm_isdst = -1; /* unknown */
2628 for (val = 0, n = 100000; n >= 1; n /= 10, q++) {
2631 val += n * (*q - '0');
2635 return negative ? -t : t;
2638 /* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. Return
2640 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
2650 while (*p != '\0' && *p != '=' && *p != '&') {
2651 if ((q - tag) < sizeof(tag) - 1)
2659 while (*p != '&' && *p != '\0') {
2660 if ((q - arg) < arg_size - 1) {
2670 if (!strcmp(tag, tag1))
2679 /* Return in 'buf' the path with '%d' replaced by number. Also handles
2680 the '%0nd' format where 'n' is the total number of digits and
2681 '%%'. Return 0 if OK, and -1 if format error */
2682 int get_frame_filename(char *buf, int buf_size,
2683 const char *path, int number)
2686 char *q, buf1[20], c;
2687 int nd, len, percentd_found;
2699 while (isdigit(*p)) {
2700 nd = nd * 10 + *p++ - '0';
2703 } while (isdigit(c));
2712 snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
2714 if ((q - buf + len) > buf_size - 1)
2716 memcpy(q, buf1, len);
2724 if ((q - buf) < buf_size - 1)
2728 if (!percentd_found)
2738 * Print nice hexa dump of a buffer
2739 * @param f stream for output
2741 * @param size buffer size
2743 void av_hex_dump(FILE *f, uint8_t *buf, int size)
2747 for(i=0;i<size;i+=16) {
2751 fprintf(f, "%08x ", i);
2754 fprintf(f, " %02x", buf[i+j]);
2759 for(j=0;j<len;j++) {
2761 if (c < ' ' || c > '~')
2763 fprintf(f, "%c", c);
2770 * Print on 'f' a nice dump of a packet
2771 * @param f stream for output
2772 * @param pkt packet to dump
2773 * @param dump_payload true if the payload must be displayed too
2775 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload)
2777 fprintf(f, "stream #%d:\n", pkt->stream_index);
2778 fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0));
2779 fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE);
2780 /* DTS is _always_ valid after av_read_frame() */
2781 fprintf(f, " dts=");
2782 if (pkt->dts == AV_NOPTS_VALUE)
2785 fprintf(f, "%0.3f", (double)pkt->dts / AV_TIME_BASE);
2786 /* PTS may be not known if B frames are present */
2787 fprintf(f, " pts=");
2788 if (pkt->pts == AV_NOPTS_VALUE)
2791 fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE);
2793 fprintf(f, " size=%d\n", pkt->size);
2795 av_hex_dump(f, pkt->data, pkt->size);
2798 void url_split(char *proto, int proto_size,
2799 char *authorization, int authorization_size,
2800 char *hostname, int hostname_size,
2802 char *path, int path_size,
2813 while (*p != ':' && *p != '\0') {
2814 if ((q - proto) < proto_size - 1)
2820 if (authorization_size > 0)
2821 authorization[0] = '\0';
2825 if (hostname_size > 0)
2829 char *at,*slash; // PETR: position of '@' character and '/' character
2836 at = strchr(p,'@'); // PETR: get the position of '@'
2837 slash = strchr(p,'/'); // PETR: get position of '/' - end of hostname
2838 if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/'
2840 q = at ? authorization : hostname; // PETR: if '@' exists starting with auth.
2842 while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR:
2843 if (*p == '@') { // PETR: passed '@'
2844 if (authorization_size > 0)
2848 } else if (!at) { // PETR: hostname
2849 if ((q - hostname) < hostname_size - 1)
2852 if ((q - authorization) < authorization_size - 1)
2857 if (hostname_size > 0)
2861 port = strtoul(p, (char **)&p, 10);
2866 pstrcpy(path, path_size, p);
2870 * Set the pts for a given stream
2872 * @param pts_wrap_bits number of bits effectively used by the pts
2873 * (used for wrap control, 33 is the value for MPEG)
2874 * @param pts_num numerator to convert to seconds (MPEG: 1)
2875 * @param pts_den denominator to convert to seconds (MPEG: 90000)
2877 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
2878 int pts_num, int pts_den)
2880 s->pts_wrap_bits = pts_wrap_bits;
2881 s->time_base.num = pts_num;
2882 s->time_base.den = pts_den;
2885 /* fraction handling */
2888 * f = val + (num / den) + 0.5. 'num' is normalized so that it is such
2889 * as 0 <= num < den.
2891 * @param f fractional number
2892 * @param val integer value
2893 * @param num must be >= 0
2894 * @param den must be >= 1
2896 void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
2908 /* set f to (val + 0.5) */
2909 void av_frac_set(AVFrac *f, int64_t val)
2912 f->num = f->den >> 1;
2916 * Fractionnal addition to f: f = f + (incr / f->den)
2918 * @param f fractional number
2919 * @param incr increment, can be positive or negative
2921 void av_frac_add(AVFrac *f, int64_t incr)
2925 num = f->num + incr;
2928 f->val += num / den;
2934 } else if (num >= den) {
2935 f->val += num / den;
2942 * register a new image format
2943 * @param img_fmt Image format descriptor
2945 void av_register_image_format(AVImageFormat *img_fmt)
2949 p = &first_image_format;
2950 while (*p != NULL) p = &(*p)->next;
2952 img_fmt->next = NULL;
2955 /* guess image format */
2956 AVImageFormat *av_probe_image_format(AVProbeData *pd)
2958 AVImageFormat *fmt1, *fmt;
2959 int score, score_max;
2963 for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
2964 if (fmt1->img_probe) {
2965 score = fmt1->img_probe(pd);
2966 if (score > score_max) {
2975 AVImageFormat *guess_image_format(const char *filename)
2977 AVImageFormat *fmt1;
2979 for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
2980 if (fmt1->extensions && match_ext(filename, fmt1->extensions))
2987 * Read an image from a stream.
2988 * @param gb byte stream containing the image
2989 * @param fmt image format, NULL if probing is required
2991 int av_read_image(ByteIOContext *pb, const char *filename,
2993 int (*alloc_cb)(void *, AVImageInfo *info), void *opaque)
2995 char buf[PROBE_BUF_SIZE];
2996 AVProbeData probe_data, *pd = &probe_data;
3001 pd->filename = filename;
3003 pos = url_ftell(pb);
3004 pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
3005 url_fseek(pb, pos, SEEK_SET);
3006 fmt = av_probe_image_format(pd);
3009 return AVERROR_NOFMT;
3010 ret = fmt->img_read(pb, alloc_cb, opaque);
3015 * Write an image to a stream.
3016 * @param pb byte stream for the image output
3017 * @param fmt image format
3018 * @param img image data and informations
3020 int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img)
3022 return fmt->img_write(pb, img);