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;
199 * Allocate and read the payload of a packet and intialized its fields to default values.
202 * @param size wanted payload size
203 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
205 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
207 int ret= av_new_packet(pkt, size);
212 pkt->pos= url_ftell(s);
214 ret= get_buffer(s, pkt->data, size);
223 /* This is a hack - the packet memory allocation stuff is broken. The
224 packet is allocated if it was not really allocated */
225 int av_dup_packet(AVPacket *pkt)
227 if (pkt->destruct != av_destruct_packet) {
229 /* we duplicate the packet and don't forget to put the padding
231 if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
232 return AVERROR_NOMEM;
233 data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
235 return AVERROR_NOMEM;
237 memcpy(data, pkt->data, pkt->size);
238 memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
240 pkt->destruct = av_destruct_packet;
247 int fifo_init(FifoBuffer *f, int size)
249 f->buffer = av_malloc(size);
252 f->end = f->buffer + size;
253 f->wptr = f->rptr = f->buffer;
257 void fifo_free(FifoBuffer *f)
262 int fifo_size(FifoBuffer *f, uint8_t *rptr)
269 if (f->wptr >= rptr) {
270 size = f->wptr - rptr;
272 size = (f->end - rptr) + (f->wptr - f->buffer);
277 /* get data from the fifo (return -1 if not enough data) */
278 int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr)
287 if (f->wptr >= rptr) {
288 size = f->wptr - rptr;
290 size = (f->end - rptr) + (f->wptr - f->buffer);
295 while (buf_size > 0) {
299 memcpy(buf, rptr, len);
310 void fifo_realloc(FifoBuffer *f, unsigned int new_size){
311 unsigned int old_size= f->end - f->buffer;
313 if(old_size < new_size){
314 uint8_t *old= f->buffer;
316 f->buffer= av_realloc(f->buffer, new_size);
318 f->rptr += f->buffer - old;
319 f->wptr += f->buffer - old;
321 if(f->wptr < f->rptr){
322 memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
323 f->rptr += new_size - old_size;
325 f->end= f->buffer + new_size;
329 void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr)
342 memcpy(wptr, buf, len);
352 /* get data from the fifo (return -1 if not enough data) */
353 int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr)
355 uint8_t *rptr = *rptr_ptr;
358 if (f->wptr >= rptr) {
359 size = f->wptr - rptr;
361 size = (f->end - rptr) + (f->wptr - f->buffer);
366 while (buf_size > 0) {
370 put_buffer(pb, rptr, len);
380 int filename_number_test(const char *filename)
385 return get_frame_filename(buf, sizeof(buf), filename, 1);
388 /* guess file format */
389 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
391 AVInputFormat *fmt1, *fmt;
392 int score, score_max;
396 for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) {
397 if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
400 if (fmt1->read_probe) {
401 score = fmt1->read_probe(pd);
402 } else if (fmt1->extensions) {
403 if (match_ext(pd->filename, fmt1->extensions)) {
407 if (score > score_max) {
415 /************************************************************/
416 /* input media file */
419 * open a media file from an IO stream. 'fmt' must be specified.
422 static const char* format_to_name(void* ptr)
424 AVFormatContext* fc = (AVFormatContext*) ptr;
425 if(fc->iformat) return fc->iformat->name;
426 else if(fc->oformat) return fc->oformat->name;
430 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name };
432 AVFormatContext *av_alloc_format_context(void)
435 ic = av_mallocz(sizeof(AVFormatContext));
437 ic->av_class = &av_format_context_class;
441 int av_open_input_stream(AVFormatContext **ic_ptr,
442 ByteIOContext *pb, const char *filename,
443 AVInputFormat *fmt, AVFormatParameters *ap)
448 ic = av_alloc_format_context();
456 ic->duration = AV_NOPTS_VALUE;
457 ic->start_time = AV_NOPTS_VALUE;
458 pstrcpy(ic->filename, sizeof(ic->filename), filename);
460 /* allocate private data */
461 if (fmt->priv_data_size > 0) {
462 ic->priv_data = av_mallocz(fmt->priv_data_size);
463 if (!ic->priv_data) {
468 ic->priv_data = NULL;
471 err = ic->iformat->read_header(ic, ap);
476 ic->data_offset = url_ftell(&ic->pb);
482 av_freep(&ic->priv_data);
489 #define PROBE_BUF_SIZE 2048
492 * Open a media file as input. The codec are not opened. Only the file
493 * header (if present) is read.
495 * @param ic_ptr the opened media file handle is put here
496 * @param filename filename to open.
497 * @param fmt if non NULL, force the file format to use
498 * @param buf_size optional buffer size (zero if default is OK)
499 * @param ap additionnal parameters needed when opening the file (NULL if default)
500 * @return 0 if OK. AVERROR_xxx otherwise.
502 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
505 AVFormatParameters *ap)
507 int err, must_open_file, file_opened;
508 uint8_t buf[PROBE_BUF_SIZE];
509 AVProbeData probe_data, *pd = &probe_data;
510 ByteIOContext pb1, *pb = &pb1;
515 pd->filename = filename;
520 /* guess format if no file can be opened */
521 fmt = av_probe_input_format(pd, 0);
524 /* do not open file if the format does not need it. XXX: specific
525 hack needed to handle RTSP/TCP */
527 if (fmt && (fmt->flags & AVFMT_NOFILE)) {
529 pb= NULL; //FIXME this or memset(pb, 0, sizeof(ByteIOContext)); otherwise its uninitalized
532 if (!fmt || must_open_file) {
533 /* if no file needed do not try to open one */
534 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
540 url_setbufsize(pb, buf_size);
543 /* read probe data */
544 pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
545 if (url_fseek(pb, 0, SEEK_SET) == (offset_t)-EPIPE) {
547 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
555 /* guess file format */
557 fmt = av_probe_input_format(pd, 1);
560 /* if still no format found, error */
566 /* XXX: suppress this hack for redirectors */
567 #ifdef CONFIG_NETWORK
568 if (fmt == &redir_demux) {
569 err = redir_open(ic_ptr, pb);
575 /* check filename in case of an image number is expected */
576 if (fmt->flags & AVFMT_NEEDNUMBER) {
577 if (filename_number_test(filename) < 0) {
578 err = AVERROR_NUMEXPECTED;
582 err = av_open_input_stream(ic_ptr, pb, filename, fmt, ap);
594 /*******************************************************/
597 * Read a transport packet from a media file. This function is
598 * absolete and should never be used. Use av_read_frame() instead.
600 * @param s media file handle
601 * @param pkt is filled
602 * @return 0 if OK. AVERROR_xxx if error.
604 int av_read_packet(AVFormatContext *s, AVPacket *pkt)
606 return s->iformat->read_packet(s, pkt);
609 /**********************************************************/
611 /* get the number of samples of an audio frame. Return (-1) if error */
612 static int get_audio_frame_size(AVCodecContext *enc, int size)
616 if (enc->frame_size <= 1) {
617 /* specific hack for pcm codecs because no frame size is
619 switch(enc->codec_id) {
620 case CODEC_ID_PCM_S16LE:
621 case CODEC_ID_PCM_S16BE:
622 case CODEC_ID_PCM_U16LE:
623 case CODEC_ID_PCM_U16BE:
624 if (enc->channels == 0)
626 frame_size = size / (2 * enc->channels);
628 case CODEC_ID_PCM_S8:
629 case CODEC_ID_PCM_U8:
630 case CODEC_ID_PCM_MULAW:
631 case CODEC_ID_PCM_ALAW:
632 if (enc->channels == 0)
634 frame_size = size / (enc->channels);
637 /* used for example by ADPCM codecs */
638 if (enc->bit_rate == 0)
640 frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate;
644 frame_size = enc->frame_size;
650 /* return the frame duration in seconds, return 0 if not available */
651 static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
652 AVCodecParserContext *pc, AVPacket *pkt)
658 switch(st->codec.codec_type) {
659 case CODEC_TYPE_VIDEO:
660 if(st->time_base.num*1000LL > st->time_base.den){
661 *pnum = st->time_base.num;
662 *pden = st->time_base.den;
663 }else if(st->codec.time_base.num*1000LL > st->codec.time_base.den){
664 *pnum = st->codec.time_base.num;
665 *pden = st->codec.time_base.den;
666 if (pc && pc->repeat_pict) {
668 *pnum = (*pnum) * (2 + pc->repeat_pict);
672 case CODEC_TYPE_AUDIO:
673 frame_size = get_audio_frame_size(&st->codec, pkt->size);
677 *pden = st->codec.sample_rate;
684 static int is_intra_only(AVCodecContext *enc){
685 if(enc->codec_type == CODEC_TYPE_AUDIO){
687 }else if(enc->codec_type == CODEC_TYPE_VIDEO){
688 switch(enc->codec_id){
690 case CODEC_ID_MJPEGB:
692 case CODEC_ID_RAWVIDEO:
693 case CODEC_ID_DVVIDEO:
694 case CODEC_ID_HUFFYUV:
695 case CODEC_ID_FFVHUFF:
706 static int64_t lsb2full(int64_t lsb, int64_t last_ts, int lsb_bits){
707 int64_t mask = lsb_bits < 64 ? (1LL<<lsb_bits)-1 : -1LL;
708 int64_t delta= last_ts - mask/2;
709 return ((lsb - delta)&mask) + delta;
712 static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
713 AVCodecParserContext *pc, AVPacket *pkt)
715 int num, den, presentation_delayed;
716 /* handle wrapping */
717 if(st->cur_dts != AV_NOPTS_VALUE){
718 if(pkt->pts != AV_NOPTS_VALUE)
719 pkt->pts= lsb2full(pkt->pts, st->cur_dts, st->pts_wrap_bits);
720 if(pkt->dts != AV_NOPTS_VALUE)
721 pkt->dts= lsb2full(pkt->dts, st->cur_dts, st->pts_wrap_bits);
724 if (pkt->duration == 0) {
725 compute_frame_duration(&num, &den, st, pc, pkt);
727 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
731 if(is_intra_only(&st->codec))
732 pkt->flags |= PKT_FLAG_KEY;
734 /* do we have a video B frame ? */
735 presentation_delayed = 0;
736 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
737 /* XXX: need has_b_frame, but cannot get it if the codec is
739 if (( st->codec.codec_id == CODEC_ID_H264
740 || st->codec.has_b_frames) &&
741 pc && pc->pict_type != FF_B_TYPE)
742 presentation_delayed = 1;
743 /* this may be redundant, but it shouldnt hurt */
744 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
745 presentation_delayed = 1;
748 if(st->cur_dts == AV_NOPTS_VALUE){
749 if(presentation_delayed) st->cur_dts = -pkt->duration;
750 else st->cur_dts = 0;
753 // 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);
754 /* interpolate PTS and DTS if they are not present */
755 if (presentation_delayed) {
756 /* DTS = decompression time stamp */
757 /* PTS = presentation time stamp */
758 if (pkt->dts == AV_NOPTS_VALUE) {
759 /* if we know the last pts, use it */
760 if(st->last_IP_pts != AV_NOPTS_VALUE)
761 st->cur_dts = pkt->dts = st->last_IP_pts;
763 pkt->dts = st->cur_dts;
765 st->cur_dts = pkt->dts;
767 /* this is tricky: the dts must be incremented by the duration
768 of the frame we are displaying, i.e. the last I or P frame */
769 if (st->last_IP_duration == 0)
770 st->cur_dts += pkt->duration;
772 st->cur_dts += st->last_IP_duration;
773 st->last_IP_duration = pkt->duration;
774 st->last_IP_pts= pkt->pts;
775 /* cannot compute PTS if not present (we can compute it only
776 by knowing the futur */
777 } else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
778 if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
779 int64_t old_diff= ABS(st->cur_dts - pkt->duration - pkt->pts);
780 int64_t new_diff= ABS(st->cur_dts - pkt->pts);
781 if(old_diff < new_diff && old_diff < (pkt->duration>>3)){
782 pkt->pts += pkt->duration;
783 // 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);
787 /* presentation is not delayed : PTS and DTS are the same */
788 if (pkt->pts == AV_NOPTS_VALUE) {
789 if (pkt->dts == AV_NOPTS_VALUE) {
790 pkt->pts = st->cur_dts;
791 pkt->dts = st->cur_dts;
794 st->cur_dts = pkt->dts;
798 st->cur_dts = pkt->pts;
801 st->cur_dts += pkt->duration;
803 // 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);
808 /* key frame computation */
809 switch(st->codec.codec_type) {
810 case CODEC_TYPE_VIDEO:
811 if (pc->pict_type == FF_I_TYPE)
812 pkt->flags |= PKT_FLAG_KEY;
814 case CODEC_TYPE_AUDIO:
815 pkt->flags |= PKT_FLAG_KEY;
823 void av_destruct_packet_nofree(AVPacket *pkt)
825 pkt->data = NULL; pkt->size = 0;
828 static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
834 /* select current input stream component */
838 /* no parsing needed: we just output the packet as is */
839 /* raw data support */
841 compute_pkt_fields(s, st, NULL, pkt);
844 } else if (s->cur_len > 0 && st->discard < AVDISCARD_ALL) {
845 len = av_parser_parse(st->parser, &st->codec, &pkt->data, &pkt->size,
846 s->cur_ptr, s->cur_len,
847 s->cur_pkt.pts, s->cur_pkt.dts);
848 s->cur_pkt.pts = AV_NOPTS_VALUE;
849 s->cur_pkt.dts = AV_NOPTS_VALUE;
850 /* increment read pointer */
854 /* return packet if any */
858 pkt->stream_index = st->index;
859 pkt->pts = st->parser->pts;
860 pkt->dts = st->parser->dts;
861 pkt->destruct = av_destruct_packet_nofree;
862 compute_pkt_fields(s, st, st->parser, pkt);
867 av_free_packet(&s->cur_pkt);
871 /* read next packet */
872 ret = av_read_packet(s, &s->cur_pkt);
876 /* return the last frames, if any */
877 for(i = 0; i < s->nb_streams; i++) {
880 av_parser_parse(st->parser, &st->codec,
881 &pkt->data, &pkt->size,
883 AV_NOPTS_VALUE, AV_NOPTS_VALUE);
888 /* no more packets: really terminates parsing */
892 st = s->streams[s->cur_pkt.stream_index];
895 s->cur_ptr = s->cur_pkt.data;
896 s->cur_len = s->cur_pkt.size;
897 if (st->need_parsing && !st->parser) {
898 st->parser = av_parser_init(st->codec.codec_id);
900 /* no parser available : just output the raw packets */
901 st->need_parsing = 0;
909 * Return the next frame of a stream. The returned packet is valid
910 * until the next av_read_frame() or until av_close_input_file() and
911 * must be freed with av_free_packet. For video, the packet contains
912 * exactly one frame. For audio, it contains an integer number of
913 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
914 * data). If the audio frames have a variable size (e.g. MPEG audio),
915 * then it contains one frame.
917 * pkt->pts, pkt->dts and pkt->duration are always set to correct
918 * values in AV_TIME_BASE unit (and guessed if the format cannot
919 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
920 * has B frames, so it is better to rely on pkt->dts if you do not
921 * decompress the payload.
923 * Return 0 if OK, < 0 if error or end of file.
925 int av_read_frame(AVFormatContext *s, AVPacket *pkt)
929 pktl = s->packet_buffer;
931 /* read packet from packet buffer, if there is data */
933 s->packet_buffer = pktl->next;
937 return av_read_frame_internal(s, pkt);
941 /* XXX: suppress the packet queue */
942 static void flush_packet_queue(AVFormatContext *s)
947 pktl = s->packet_buffer;
950 s->packet_buffer = pktl->next;
951 av_free_packet(&pktl->pkt);
956 /*******************************************************/
959 int av_find_default_stream_index(AVFormatContext *s)
964 if (s->nb_streams <= 0)
966 for(i = 0; i < s->nb_streams; i++) {
968 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
975 /* flush the frame reader */
976 static void av_read_frame_flush(AVFormatContext *s)
981 flush_packet_queue(s);
983 /* free previous packet */
985 if (s->cur_st->parser)
986 av_free_packet(&s->cur_pkt);
993 /* for each stream, reset read state */
994 for(i = 0; i < s->nb_streams; i++) {
998 av_parser_close(st->parser);
1001 st->last_IP_pts = AV_NOPTS_VALUE;
1002 st->cur_dts = 0; /* we set the current DTS to an unspecified origin */
1007 * updates cur_dts of all streams based on given timestamp and AVStream.
1008 * stream ref_st unchanged, others set cur_dts in their native timebase
1009 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
1010 * @param timestamp new dts expressed in time_base of param ref_st
1011 * @param ref_st reference stream giving time_base of param timestamp
1013 static void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
1016 for(i = 0; i < s->nb_streams; i++) {
1017 AVStream *st = s->streams[i];
1019 st->cur_dts = av_rescale(timestamp,
1020 st->time_base.den * (int64_t)ref_st->time_base.num,
1021 st->time_base.num * (int64_t)ref_st->time_base.den);
1026 * add a index entry into a sorted list updateing if it is already there.
1027 * @param timestamp timestamp in the timebase of the given stream
1029 int av_add_index_entry(AVStream *st,
1030 int64_t pos, int64_t timestamp, int distance, int flags)
1032 AVIndexEntry *entries, *ie;
1035 if((unsigned)st->nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1038 entries = av_fast_realloc(st->index_entries,
1039 &st->index_entries_allocated_size,
1040 (st->nb_index_entries + 1) *
1041 sizeof(AVIndexEntry));
1045 st->index_entries= entries;
1047 index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY);
1050 index= st->nb_index_entries++;
1051 ie= &entries[index];
1052 assert(index==0 || ie[-1].timestamp < timestamp);
1054 ie= &entries[index];
1055 if(ie->timestamp != timestamp){
1056 if(ie->timestamp <= timestamp)
1058 memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
1059 st->nb_index_entries++;
1060 }else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance
1061 distance= ie->min_distance;
1065 ie->timestamp = timestamp;
1066 ie->min_distance= distance;
1072 /* build an index for raw streams using a parser */
1073 static void av_build_index_raw(AVFormatContext *s)
1075 AVPacket pkt1, *pkt = &pkt1;
1080 av_read_frame_flush(s);
1081 url_fseek(&s->pb, s->data_offset, SEEK_SET);
1084 ret = av_read_frame(s, pkt);
1087 if (pkt->stream_index == 0 && st->parser &&
1088 (pkt->flags & PKT_FLAG_KEY)) {
1089 av_add_index_entry(st, st->parser->frame_offset, pkt->dts,
1090 0, AVINDEX_KEYFRAME);
1092 av_free_packet(pkt);
1096 /* return TRUE if we deal with a raw stream (raw codec data and
1098 static int is_raw_stream(AVFormatContext *s)
1102 if (s->nb_streams != 1)
1105 if (!st->need_parsing)
1111 * gets the index for a specific timestamp.
1112 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
1113 * the timestamp which is <= the requested one, if backward is 0
1114 * then it will be >=
1115 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1116 * @return < 0 if no such timestamp could be found
1118 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
1121 AVIndexEntry *entries= st->index_entries;
1122 int nb_entries= st->nb_index_entries;
1131 timestamp = entries[m].timestamp;
1132 if(timestamp >= wanted_timestamp)
1134 if(timestamp <= wanted_timestamp)
1137 m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
1139 if(!(flags & AVSEEK_FLAG_ANY)){
1140 while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){
1141 m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
1153 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
1154 * this isnt supposed to be called directly by a user application, but by demuxers
1155 * @param target_ts target timestamp in the time base of the given stream
1156 * @param stream_index stream number
1158 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1159 AVInputFormat *avif= s->iformat;
1160 int64_t pos_min, pos_max, pos, pos_limit;
1161 int64_t ts_min, ts_max, ts;
1163 int index, no_change;
1166 if (stream_index < 0)
1170 av_log(s, AV_LOG_DEBUG, "read_seek: %d %lld\n", stream_index, target_ts);
1174 ts_min= AV_NOPTS_VALUE;
1175 pos_limit= -1; //gcc falsely says it may be uninitalized
1177 st= s->streams[stream_index];
1178 if(st->index_entries){
1181 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()
1182 index= FFMAX(index, 0);
1183 e= &st->index_entries[index];
1185 if(e->timestamp <= target_ts || e->pos == e->min_distance){
1187 ts_min= e->timestamp;
1189 av_log(s, AV_LOG_DEBUG, "using cached pos_min=0x%llx dts_min=%lld\n",
1196 index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
1197 assert(index < st->nb_index_entries);
1199 e= &st->index_entries[index];
1200 assert(e->timestamp >= target_ts);
1202 ts_max= e->timestamp;
1203 pos_limit= pos_max - e->min_distance;
1205 av_log(s, AV_LOG_DEBUG, "using cached pos_max=0x%llx pos_limit=0x%llx dts_max=%lld\n",
1206 pos_max,pos_limit, ts_max);
1211 if(ts_min == AV_NOPTS_VALUE){
1212 pos_min = s->data_offset;
1213 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1214 if (ts_min == AV_NOPTS_VALUE)
1218 if(ts_max == AV_NOPTS_VALUE){
1220 pos_max = url_fsize(&s->pb) - 1;
1223 ts_max = avif->read_timestamp(s, stream_index, &pos_max, pos_max + step);
1225 }while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
1226 if (ts_max == AV_NOPTS_VALUE)
1230 int64_t tmp_pos= pos_max + 1;
1231 int64_t tmp_ts= avif->read_timestamp(s, stream_index, &tmp_pos, INT64_MAX);
1232 if(tmp_ts == AV_NOPTS_VALUE)
1241 while (pos_min < pos_limit) {
1243 av_log(s, AV_LOG_DEBUG, "pos_min=0x%llx pos_max=0x%llx dts_min=%lld dts_max=%lld\n",
1247 assert(pos_limit <= pos_max);
1250 int64_t approximate_keyframe_distance= pos_max - pos_limit;
1251 // interpolate position (better than dichotomy)
1252 pos = av_rescale(target_ts - ts_min, pos_max - pos_min, ts_max - ts_min)
1253 + pos_min - approximate_keyframe_distance;
1254 }else if(no_change==1){
1255 // bisection, if interpolation failed to change min or max pos last time
1256 pos = (pos_min + pos_limit)>>1;
1258 // linear search if bisection failed, can only happen if there are very few or no keframes between min/max
1263 else if(pos > pos_limit)
1267 ts = avif->read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
1273 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);
1275 assert(ts != AV_NOPTS_VALUE);
1276 if (target_ts <= ts) {
1277 pos_limit = start_pos - 1;
1281 if (target_ts >= ts) {
1287 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
1288 ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
1291 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1293 ts_max = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1294 av_log(s, AV_LOG_DEBUG, "pos=0x%llx %lld<=%lld<=%lld\n",
1295 pos, ts_min, target_ts, ts_max);
1298 url_fseek(&s->pb, pos, SEEK_SET);
1300 av_update_cur_dts(s, st, ts);
1305 static int av_seek_frame_byte(AVFormatContext *s, int stream_index, int64_t pos, int flags){
1306 int64_t pos_min, pos_max;
1310 if (stream_index < 0)
1313 st= s->streams[stream_index];
1316 pos_min = s->data_offset;
1317 pos_max = url_fsize(&s->pb) - 1;
1319 if (pos < pos_min) pos= pos_min;
1320 else if(pos > pos_max) pos= pos_max;
1322 url_fseek(&s->pb, pos, SEEK_SET);
1325 av_update_cur_dts(s, st, ts);
1330 static int av_seek_frame_generic(AVFormatContext *s,
1331 int stream_index, int64_t timestamp, int flags)
1337 if (!s->index_built) {
1338 if (is_raw_stream(s)) {
1339 av_build_index_raw(s);
1346 st = s->streams[stream_index];
1347 index = av_index_search_timestamp(st, timestamp, flags);
1351 /* now we have found the index, we can seek */
1352 ie = &st->index_entries[index];
1353 av_read_frame_flush(s);
1354 url_fseek(&s->pb, ie->pos, SEEK_SET);
1356 av_update_cur_dts(s, st, ie->timestamp);
1362 * Seek to the key frame at timestamp.
1363 * 'timestamp' in 'stream_index'.
1364 * @param stream_index If stream_index is (-1), a default
1365 * stream is selected, and timestamp is automatically converted
1366 * from AV_TIME_BASE units to the stream specific time_base.
1367 * @param timestamp timestamp in AVStream.time_base units
1368 * @param flags flags which select direction and seeking mode
1369 * @return >= 0 on success
1371 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1376 av_read_frame_flush(s);
1378 if(flags & AVSEEK_FLAG_BYTE)
1379 return av_seek_frame_byte(s, stream_index, timestamp, flags);
1381 if(stream_index < 0){
1382 stream_index= av_find_default_stream_index(s);
1383 if(stream_index < 0)
1386 st= s->streams[stream_index];
1387 /* timestamp for default must be expressed in AV_TIME_BASE units */
1388 timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
1390 st= s->streams[stream_index];
1392 /* first, we try the format specific seek */
1393 if (s->iformat->read_seek)
1394 ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
1401 if(s->iformat->read_timestamp)
1402 return av_seek_frame_binary(s, stream_index, timestamp, flags);
1404 return av_seek_frame_generic(s, stream_index, timestamp, flags);
1407 /*******************************************************/
1409 /* return TRUE if the stream has accurate timings for at least one component */
1410 static int av_has_timings(AVFormatContext *ic)
1415 for(i = 0;i < ic->nb_streams; i++) {
1416 st = ic->streams[i];
1417 if (st->start_time != AV_NOPTS_VALUE &&
1418 st->duration != AV_NOPTS_VALUE)
1424 /* estimate the stream timings from the one of each components. Also
1425 compute the global bitrate if possible */
1426 static void av_update_stream_timings(AVFormatContext *ic)
1428 int64_t start_time, start_time1, end_time, end_time1;
1432 start_time = MAXINT64;
1433 end_time = MININT64;
1434 for(i = 0;i < ic->nb_streams; i++) {
1435 st = ic->streams[i];
1436 if (st->start_time != AV_NOPTS_VALUE) {
1437 start_time1= av_rescale_q(st->start_time, st->time_base, AV_TIME_BASE_Q);
1438 if (start_time1 < start_time)
1439 start_time = start_time1;
1440 if (st->duration != AV_NOPTS_VALUE) {
1441 end_time1 = start_time1
1442 + av_rescale_q(st->duration, st->time_base, AV_TIME_BASE_Q);
1443 if (end_time1 > end_time)
1444 end_time = end_time1;
1448 if (start_time != MAXINT64) {
1449 ic->start_time = start_time;
1450 if (end_time != MAXINT64) {
1451 ic->duration = end_time - start_time;
1452 if (ic->file_size > 0) {
1453 /* compute the bit rate */
1454 ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
1455 (double)ic->duration;
1462 static void fill_all_stream_timings(AVFormatContext *ic)
1467 av_update_stream_timings(ic);
1468 for(i = 0;i < ic->nb_streams; i++) {
1469 st = ic->streams[i];
1470 if (st->start_time == AV_NOPTS_VALUE) {
1471 if(ic->start_time != AV_NOPTS_VALUE)
1472 st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q, st->time_base);
1473 if(ic->duration != AV_NOPTS_VALUE)
1474 st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q, st->time_base);
1479 static void av_estimate_timings_from_bit_rate(AVFormatContext *ic)
1481 int64_t filesize, duration;
1485 /* if bit_rate is already set, we believe it */
1486 if (ic->bit_rate == 0) {
1488 for(i=0;i<ic->nb_streams;i++) {
1489 st = ic->streams[i];
1490 bit_rate += st->codec.bit_rate;
1492 ic->bit_rate = bit_rate;
1495 /* if duration is already set, we believe it */
1496 if (ic->duration == AV_NOPTS_VALUE &&
1497 ic->bit_rate != 0 &&
1498 ic->file_size != 0) {
1499 filesize = ic->file_size;
1501 for(i = 0; i < ic->nb_streams; i++) {
1502 st = ic->streams[i];
1503 duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
1504 if (st->start_time == AV_NOPTS_VALUE ||
1505 st->duration == AV_NOPTS_VALUE) {
1507 st->duration = duration;
1514 #define DURATION_MAX_READ_SIZE 250000
1516 /* only usable for MPEG-PS streams */
1517 static void av_estimate_timings_from_pts(AVFormatContext *ic)
1519 AVPacket pkt1, *pkt = &pkt1;
1521 int read_size, i, ret;
1522 int64_t start_time, end_time, end_time1;
1523 int64_t filesize, offset, duration;
1525 /* free previous packet */
1526 if (ic->cur_st && ic->cur_st->parser)
1527 av_free_packet(&ic->cur_pkt);
1530 /* flush packet queue */
1531 flush_packet_queue(ic);
1533 for(i=0;i<ic->nb_streams;i++) {
1534 st = ic->streams[i];
1536 av_parser_close(st->parser);
1541 /* we read the first packets to get the first PTS (not fully
1542 accurate, but it is enough now) */
1543 url_fseek(&ic->pb, 0, SEEK_SET);
1546 if (read_size >= DURATION_MAX_READ_SIZE)
1548 /* if all info is available, we can stop */
1549 for(i = 0;i < ic->nb_streams; i++) {
1550 st = ic->streams[i];
1551 if (st->start_time == AV_NOPTS_VALUE)
1554 if (i == ic->nb_streams)
1557 ret = av_read_packet(ic, pkt);
1560 read_size += pkt->size;
1561 st = ic->streams[pkt->stream_index];
1562 if (pkt->pts != AV_NOPTS_VALUE) {
1563 if (st->start_time == AV_NOPTS_VALUE)
1564 st->start_time = pkt->pts;
1566 av_free_packet(pkt);
1569 /* estimate the end time (duration) */
1570 /* XXX: may need to support wrapping */
1571 filesize = ic->file_size;
1572 offset = filesize - DURATION_MAX_READ_SIZE;
1576 url_fseek(&ic->pb, offset, SEEK_SET);
1579 if (read_size >= DURATION_MAX_READ_SIZE)
1581 /* if all info is available, we can stop */
1582 for(i = 0;i < ic->nb_streams; i++) {
1583 st = ic->streams[i];
1584 if (st->duration == AV_NOPTS_VALUE)
1587 if (i == ic->nb_streams)
1590 ret = av_read_packet(ic, pkt);
1593 read_size += pkt->size;
1594 st = ic->streams[pkt->stream_index];
1595 if (pkt->pts != AV_NOPTS_VALUE) {
1596 end_time = pkt->pts;
1597 duration = end_time - st->start_time;
1599 if (st->duration == AV_NOPTS_VALUE ||
1600 st->duration < duration)
1601 st->duration = duration;
1604 av_free_packet(pkt);
1607 fill_all_stream_timings(ic);
1609 url_fseek(&ic->pb, 0, SEEK_SET);
1612 static void av_estimate_timings(AVFormatContext *ic)
1616 /* get the file size, if possible */
1617 if (ic->iformat->flags & AVFMT_NOFILE) {
1620 file_size = url_fsize(&ic->pb);
1624 ic->file_size = file_size;
1626 if ((ic->iformat == &mpegps_demux || ic->iformat == &mpegts_demux) && file_size && !ic->pb.is_streamed) {
1627 /* get accurate estimate from the PTSes */
1628 av_estimate_timings_from_pts(ic);
1629 } else if (av_has_timings(ic)) {
1630 /* at least one components has timings - we use them for all
1632 fill_all_stream_timings(ic);
1634 /* less precise: use bit rate info */
1635 av_estimate_timings_from_bit_rate(ic);
1637 av_update_stream_timings(ic);
1643 for(i = 0;i < ic->nb_streams; i++) {
1644 st = ic->streams[i];
1645 printf("%d: start_time: %0.3f duration: %0.3f\n",
1646 i, (double)st->start_time / AV_TIME_BASE,
1647 (double)st->duration / AV_TIME_BASE);
1649 printf("stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
1650 (double)ic->start_time / AV_TIME_BASE,
1651 (double)ic->duration / AV_TIME_BASE,
1652 ic->bit_rate / 1000);
1657 static int has_codec_parameters(AVCodecContext *enc)
1660 switch(enc->codec_type) {
1661 case CODEC_TYPE_AUDIO:
1662 val = enc->sample_rate;
1664 case CODEC_TYPE_VIDEO:
1665 val = enc->width && enc->pix_fmt != PIX_FMT_NONE;
1674 static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
1678 int got_picture, ret;
1681 codec = avcodec_find_decoder(st->codec.codec_id);
1684 ret = avcodec_open(&st->codec, codec);
1688 if(!has_codec_parameters(&st->codec)){
1689 switch(st->codec.codec_type) {
1690 case CODEC_TYPE_VIDEO:
1691 ret = avcodec_decode_video(&st->codec, &picture,
1692 &got_picture, (uint8_t *)data, size);
1694 case CODEC_TYPE_AUDIO:
1695 samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
1698 ret = avcodec_decode_audio(&st->codec, samples,
1699 &got_picture, (uint8_t *)data, size);
1707 avcodec_close(&st->codec);
1711 /* absolute maximum size we read until we abort */
1712 #define MAX_READ_SIZE 5000000
1714 /* maximum duration until we stop analysing the stream */
1715 #define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 1.0))
1718 * Read the beginning of a media file to get stream information. This
1719 * is useful for file formats with no headers such as MPEG. This
1720 * function also compute the real frame rate in case of mpeg2 repeat
1723 * @param ic media file handle
1724 * @return >=0 if OK. AVERROR_xxx if error.
1725 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
1727 int av_find_stream_info(AVFormatContext *ic)
1729 int i, count, ret, read_size;
1731 AVPacket pkt1, *pkt;
1732 AVPacketList *pktl=NULL, **ppktl;
1733 int64_t last_dts[MAX_STREAMS];
1734 int64_t duration_sum[MAX_STREAMS];
1735 int duration_count[MAX_STREAMS]={0};
1737 for(i=0;i<ic->nb_streams;i++) {
1738 st = ic->streams[i];
1739 if(st->codec.codec_type == CODEC_TYPE_VIDEO){
1740 /* if(!st->time_base.num)
1742 if(!st->codec.time_base.num)
1743 st->codec.time_base= st->time_base;
1747 for(i=0;i<MAX_STREAMS;i++){
1748 last_dts[i]= AV_NOPTS_VALUE;
1749 duration_sum[i]= INT64_MAX;
1754 ppktl = &ic->packet_buffer;
1756 /* check if one codec still needs to be handled */
1757 for(i=0;i<ic->nb_streams;i++) {
1758 st = ic->streams[i];
1759 if (!has_codec_parameters(&st->codec))
1761 /* variable fps and no guess at the real fps */
1762 if( st->codec.time_base.den >= 1000LL*st->codec.time_base.num
1763 && duration_count[i]<20 && st->codec.codec_type == CODEC_TYPE_VIDEO)
1766 if (i == ic->nb_streams) {
1767 /* NOTE: if the format has no header, then we need to read
1768 some packets to get most of the streams, so we cannot
1770 if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
1771 /* if we found the info for all the codecs, we can stop */
1776 /* we did not get all the codec info, but we read too much data */
1777 if (read_size >= MAX_READ_SIZE) {
1783 /* NOTE: a new stream can be added there if no header in file
1784 (AVFMTCTX_NOHEADER) */
1785 ret = av_read_frame_internal(ic, &pkt1);
1788 ret = -1; /* we could not have all the codec parameters before EOF */
1789 for(i=0;i<ic->nb_streams;i++) {
1790 st = ic->streams[i];
1791 if (!has_codec_parameters(&st->codec))
1794 if (i == ic->nb_streams)
1799 pktl = av_mallocz(sizeof(AVPacketList));
1801 ret = AVERROR_NOMEM;
1805 /* add the packet in the buffered packet list */
1807 ppktl = &pktl->next;
1812 /* duplicate the packet */
1813 if (av_dup_packet(pkt) < 0) {
1814 ret = AVERROR_NOMEM;
1818 read_size += pkt->size;
1820 st = ic->streams[pkt->stream_index];
1821 st->codec_info_duration += pkt->duration;
1822 if (pkt->duration != 0)
1823 st->codec_info_nb_frames++;
1826 int index= pkt->stream_index;
1827 int64_t last= last_dts[index];
1828 int64_t duration= pkt->dts - last;
1830 if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && duration>0){
1831 if(duration*duration_count[index]*10/9 < duration_sum[index]){
1832 duration_sum[index]= duration;
1833 duration_count[index]=1;
1835 int factor= av_rescale(duration, duration_count[index], duration_sum[index]);
1836 duration_sum[index] += duration;
1837 duration_count[index]+= factor;
1839 if(st->codec_info_nb_frames == 0)
1840 st->codec_info_duration += duration;
1842 last_dts[pkt->stream_index]= pkt->dts;
1844 /* if still no information, we try to open the codec and to
1845 decompress the frame. We try to avoid that in most cases as
1846 it takes longer and uses more memory. For MPEG4, we need to
1847 decompress for Quicktime. */
1848 if (!has_codec_parameters(&st->codec) /*&&
1849 (st->codec.codec_id == CODEC_ID_FLV1 ||
1850 st->codec.codec_id == CODEC_ID_H264 ||
1851 st->codec.codec_id == CODEC_ID_H263 ||
1852 st->codec.codec_id == CODEC_ID_H261 ||
1853 st->codec.codec_id == CODEC_ID_VORBIS ||
1854 st->codec.codec_id == CODEC_ID_MJPEG ||
1855 st->codec.codec_id == CODEC_ID_PNG ||
1856 st->codec.codec_id == CODEC_ID_PAM ||
1857 st->codec.codec_id == CODEC_ID_PGM ||
1858 st->codec.codec_id == CODEC_ID_PGMYUV ||
1859 st->codec.codec_id == CODEC_ID_PBM ||
1860 st->codec.codec_id == CODEC_ID_PPM ||
1861 st->codec.codec_id == CODEC_ID_SHORTEN ||
1862 (st->codec.codec_id == CODEC_ID_MPEG4 && !st->need_parsing))*/)
1863 try_decode_frame(st, pkt->data, pkt->size);
1865 if (av_rescale_q(st->codec_info_duration, st->time_base, AV_TIME_BASE_Q) >= MAX_STREAM_DURATION) {
1871 for(i=0;i<ic->nb_streams;i++) {
1872 st = ic->streams[i];
1873 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
1874 if(st->codec.codec_id == CODEC_ID_RAWVIDEO && !st->codec.codec_tag && !st->codec.bits_per_sample)
1875 st->codec.codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec.pix_fmt);
1877 if(duration_count[i] && st->codec.time_base.num*1000LL <= st->codec.time_base.den &&
1878 st->time_base.num*duration_sum[i]/duration_count[i]*1000LL > st->time_base.den){
1882 num= st->time_base.den*duration_count[i];
1883 den= st->time_base.num*duration_sum[i];
1885 av_reduce(&fps1.num, &fps1.den, num*1001, den*1000, FFMAX(st->time_base.den, st->time_base.num)/4);
1886 av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, den, FFMAX(st->time_base.den, st->time_base.num)/4);
1887 if(fps1.num < st->r_frame_rate.num && fps1.den == 1 && (fps1.num==24 || fps1.num==30)){ //FIXME better decission
1888 st->r_frame_rate.num= fps1.num*1000;
1889 st->r_frame_rate.den= fps1.den*1001;
1893 /* set real frame rate info */
1894 /* compute the real frame rate for telecine */
1895 if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO ||
1896 st->codec.codec_id == CODEC_ID_MPEG2VIDEO) &&
1897 st->codec.sub_id == 2) {
1898 if (st->codec_info_nb_frames >= 20) {
1899 float coded_frame_rate, est_frame_rate;
1900 est_frame_rate = ((double)st->codec_info_nb_frames * AV_TIME_BASE) /
1901 (double)st->codec_info_duration ;
1902 coded_frame_rate = 1.0/av_q2d(st->codec.time_base);
1904 printf("telecine: coded_frame_rate=%0.3f est_frame_rate=%0.3f\n",
1905 coded_frame_rate, est_frame_rate);
1907 /* if we detect that it could be a telecine, we
1908 signal it. It would be better to do it at a
1909 higher level as it can change in a film */
1910 if (coded_frame_rate >= 24.97 &&
1911 (est_frame_rate >= 23.5 && est_frame_rate < 24.5)) {
1912 st->r_frame_rate = (AVRational){24000, 1001};
1916 /* if no real frame rate, use the codec one */
1917 if (!st->r_frame_rate.num){
1918 st->r_frame_rate.num = st->codec.time_base.den;
1919 st->r_frame_rate.den = st->codec.time_base.num;
1924 av_estimate_timings(ic);
1926 /* correct DTS for b frame streams with no timestamps */
1927 for(i=0;i<ic->nb_streams;i++) {
1928 st = ic->streams[i];
1929 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
1931 ppktl = &ic->packet_buffer;
1933 if(ppkt1->stream_index != i)
1935 if(ppkt1->pkt->dts < 0)
1937 if(ppkt1->pkt->pts != AV_NOPTS_VALUE)
1939 ppkt1->pkt->dts -= delta;
1944 st->cur_dts -= delta;
1952 /*******************************************************/
1955 * start playing a network based stream (e.g. RTSP stream) at the
1958 int av_read_play(AVFormatContext *s)
1960 if (!s->iformat->read_play)
1961 return AVERROR_NOTSUPP;
1962 return s->iformat->read_play(s);
1966 * pause a network based stream (e.g. RTSP stream). Use av_read_play()
1969 int av_read_pause(AVFormatContext *s)
1971 if (!s->iformat->read_pause)
1972 return AVERROR_NOTSUPP;
1973 return s->iformat->read_pause(s);
1977 * Close a media file (but not its codecs)
1979 * @param s media file handle
1981 void av_close_input_file(AVFormatContext *s)
1983 int i, must_open_file;
1986 /* free previous packet */
1987 if (s->cur_st && s->cur_st->parser)
1988 av_free_packet(&s->cur_pkt);
1990 if (s->iformat->read_close)
1991 s->iformat->read_close(s);
1992 for(i=0;i<s->nb_streams;i++) {
1993 /* free all data in a stream component */
1996 av_parser_close(st->parser);
1998 av_free(st->index_entries);
2001 flush_packet_queue(s);
2003 if (s->iformat->flags & AVFMT_NOFILE) {
2006 if (must_open_file) {
2009 av_freep(&s->priv_data);
2014 * Add a new stream to a media file. Can only be called in the
2015 * read_header function. If the flag AVFMTCTX_NOHEADER is in the
2016 * format context, then new streams can be added in read_packet too.
2019 * @param s media file handle
2020 * @param id file format dependent stream id
2022 AVStream *av_new_stream(AVFormatContext *s, int id)
2026 if (s->nb_streams >= MAX_STREAMS)
2029 st = av_mallocz(sizeof(AVStream));
2032 avcodec_get_context_defaults(&st->codec);
2034 /* no default bitrate if decoding */
2035 st->codec.bit_rate = 0;
2037 st->index = s->nb_streams;
2039 st->start_time = AV_NOPTS_VALUE;
2040 st->duration = AV_NOPTS_VALUE;
2041 st->cur_dts = AV_NOPTS_VALUE;
2043 /* default pts settings is MPEG like */
2044 av_set_pts_info(st, 33, 1, 90000);
2045 st->last_IP_pts = AV_NOPTS_VALUE;
2047 s->streams[s->nb_streams++] = st;
2051 /************************************************************/
2052 /* output media file */
2054 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
2058 if (s->oformat->priv_data_size > 0) {
2059 s->priv_data = av_mallocz(s->oformat->priv_data_size);
2061 return AVERROR_NOMEM;
2063 s->priv_data = NULL;
2065 if (s->oformat->set_parameters) {
2066 ret = s->oformat->set_parameters(s, ap);
2074 * allocate the stream private data and write the stream header to an
2077 * @param s media file handle
2078 * @return 0 if OK. AVERROR_xxx if error.
2080 int av_write_header(AVFormatContext *s)
2085 ret = s->oformat->write_header(s);
2089 /* init PTS generation */
2090 for(i=0;i<s->nb_streams;i++) {
2093 switch (st->codec.codec_type) {
2094 case CODEC_TYPE_AUDIO:
2095 av_frac_init(&st->pts, 0, 0,
2096 (int64_t)st->time_base.num * st->codec.sample_rate);
2098 case CODEC_TYPE_VIDEO:
2099 av_frac_init(&st->pts, 0, 0,
2100 (int64_t)st->time_base.num * st->codec.time_base.den);
2109 //FIXME merge with compute_pkt_fields
2110 static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){
2111 int b_frames = FFMAX(st->codec.has_b_frames, st->codec.max_b_frames);
2112 int num, den, frame_size;
2114 // 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);
2116 /* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
2119 /* duration field */
2120 if (pkt->duration == 0) {
2121 compute_frame_duration(&num, &den, st, NULL, pkt);
2123 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
2127 //XXX/FIXME this is a temporary hack until all encoders output pts
2128 if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !b_frames){
2130 // pkt->pts= st->cur_dts;
2131 pkt->pts= st->pts.val;
2134 //calculate dts from pts
2135 if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE){
2137 if(st->last_IP_pts == AV_NOPTS_VALUE){
2138 st->last_IP_pts= -pkt->duration;
2140 if(st->last_IP_pts < pkt->pts){
2141 pkt->dts= st->last_IP_pts;
2142 st->last_IP_pts= pkt->pts;
2149 if(st->cur_dts && st->cur_dts != AV_NOPTS_VALUE && st->cur_dts >= pkt->dts){
2150 av_log(NULL, AV_LOG_ERROR, "error, non monotone timestamps %Ld >= %Ld\n", st->cur_dts, pkt->dts);
2153 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
2154 av_log(NULL, AV_LOG_ERROR, "error, pts < dts\n");
2158 // av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts2:%lld dts2:%lld\n", pkt->pts, pkt->dts);
2159 st->cur_dts= pkt->dts;
2160 st->pts.val= pkt->dts;
2163 switch (st->codec.codec_type) {
2164 case CODEC_TYPE_AUDIO:
2165 frame_size = get_audio_frame_size(&st->codec, pkt->size);
2167 /* HACK/FIXME, we skip the initial 0-size packets as they are most likely equal to the encoder delay,
2168 but it would be better if we had the real timestamps from the encoder */
2169 if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) {
2170 av_frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
2173 case CODEC_TYPE_VIDEO:
2174 av_frac_add(&st->pts, (int64_t)st->time_base.den * st->codec.time_base.num);
2182 static void truncate_ts(AVStream *st, AVPacket *pkt){
2183 int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1;
2186 // pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
2188 pkt->pts &= pts_mask;
2189 pkt->dts &= pts_mask;
2193 * Write a packet to an output media file. The packet shall contain
2194 * one audio or video frame.
2196 * @param s media file handle
2197 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2198 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2200 int av_write_frame(AVFormatContext *s, AVPacket *pkt)
2204 ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt);
2208 truncate_ts(s->streams[pkt->stream_index], pkt);
2210 ret= s->oformat->write_packet(s, pkt);
2212 ret= url_ferror(&s->pb);
2217 * interleave_packet implementation which will interleave per DTS.
2219 static int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush){
2220 AVPacketList *pktl, **next_point, *this_pktl;
2222 int streams[MAX_STREAMS];
2225 AVStream *st= s->streams[ pkt->stream_index];
2227 assert(pkt->destruct != av_destruct_packet); //FIXME
2229 this_pktl = av_mallocz(sizeof(AVPacketList));
2230 this_pktl->pkt= *pkt;
2231 av_dup_packet(&this_pktl->pkt);
2233 next_point = &s->packet_buffer;
2235 AVStream *st2= s->streams[ (*next_point)->pkt.stream_index];
2236 int64_t left= st2->time_base.num * (int64_t)st ->time_base.den;
2237 int64_t right= st ->time_base.num * (int64_t)st2->time_base.den;
2238 if((*next_point)->pkt.dts * left > pkt->dts * right) //FIXME this can overflow
2240 next_point= &(*next_point)->next;
2242 this_pktl->next= *next_point;
2243 *next_point= this_pktl;
2246 memset(streams, 0, sizeof(streams));
2247 pktl= s->packet_buffer;
2249 //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
2250 if(streams[ pktl->pkt.stream_index ] == 0)
2252 streams[ pktl->pkt.stream_index ]++;
2256 if(s->nb_streams == stream_count || (flush && stream_count)){
2257 pktl= s->packet_buffer;
2260 s->packet_buffer= pktl->next;
2264 av_init_packet(out);
2270 * Interleaves a AVPacket correctly so it can be muxed.
2271 * @param out the interleaved packet will be output here
2272 * @param in the input packet
2273 * @param flush 1 if no further packets are available as input and all
2274 * remaining packets should be output
2275 * @return 1 if a packet was output, 0 if no packet could be output,
2276 * < 0 if an error occured
2278 static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
2279 if(s->oformat->interleave_packet)
2280 return s->oformat->interleave_packet(s, out, in, flush);
2282 return av_interleave_packet_per_dts(s, out, in, flush);
2286 * Writes a packet to an output media file ensuring correct interleaving.
2287 * The packet shall contain one audio or video frame.
2288 * If the packets are already correctly interleaved the application should
2289 * call av_write_frame() instead as its slightly faster, its also important
2290 * to keep in mind that completly non interleaved input will need huge amounts
2291 * of memory to interleave with this, so its prefereable to interleave at the
2294 * @param s media file handle
2295 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2296 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2298 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
2299 AVStream *st= s->streams[ pkt->stream_index];
2301 //FIXME/XXX/HACK drop zero sized packets
2302 if(st->codec.codec_type == CODEC_TYPE_AUDIO && pkt->size==0)
2305 //av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %Ld %Ld\n", pkt->size, pkt->dts, pkt->pts);
2306 if(compute_pkt_fields2(st, pkt) < 0)
2309 if(pkt->dts == AV_NOPTS_VALUE)
2314 int ret= av_interleave_packet(s, &opkt, pkt, 0);
2315 if(ret<=0) //FIXME cleanup needed for ret<0 ?
2318 truncate_ts(s->streams[opkt.stream_index], &opkt);
2319 ret= s->oformat->write_packet(s, &opkt);
2321 av_free_packet(&opkt);
2326 if(url_ferror(&s->pb))
2327 return url_ferror(&s->pb);
2332 * write the stream trailer to an output media file and and free the
2333 * file private data.
2335 * @param s media file handle
2336 * @return 0 if OK. AVERROR_xxx if error. */
2337 int av_write_trailer(AVFormatContext *s)
2343 ret= av_interleave_packet(s, &pkt, NULL, 1);
2344 if(ret<0) //FIXME cleanup needed for ret<0 ?
2349 truncate_ts(s->streams[pkt.stream_index], &pkt);
2350 ret= s->oformat->write_packet(s, &pkt);
2352 av_free_packet(&pkt);
2356 if(url_ferror(&s->pb))
2360 ret = s->oformat->write_trailer(s);
2363 ret=url_ferror(&s->pb);
2364 for(i=0;i<s->nb_streams;i++)
2365 av_freep(&s->streams[i]->priv_data);
2366 av_freep(&s->priv_data);
2370 /* "user interface" functions */
2372 void dump_format(AVFormatContext *ic,
2380 av_log(NULL, AV_LOG_INFO, "%s #%d, %s, %s '%s':\n",
2381 is_output ? "Output" : "Input",
2383 is_output ? ic->oformat->name : ic->iformat->name,
2384 is_output ? "to" : "from", url);
2386 av_log(NULL, AV_LOG_INFO, " Duration: ");
2387 if (ic->duration != AV_NOPTS_VALUE) {
2388 int hours, mins, secs, us;
2389 secs = ic->duration / AV_TIME_BASE;
2390 us = ic->duration % AV_TIME_BASE;
2395 av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%01d", hours, mins, secs,
2396 (10 * us) / AV_TIME_BASE);
2398 av_log(NULL, AV_LOG_INFO, "N/A");
2400 if (ic->start_time != AV_NOPTS_VALUE) {
2402 av_log(NULL, AV_LOG_INFO, ", start: ");
2403 secs = ic->start_time / AV_TIME_BASE;
2404 us = ic->start_time % AV_TIME_BASE;
2405 av_log(NULL, AV_LOG_INFO, "%d.%06d",
2406 secs, (int)av_rescale(us, 1000000, AV_TIME_BASE));
2408 av_log(NULL, AV_LOG_INFO, ", bitrate: ");
2410 av_log(NULL, AV_LOG_INFO,"%d kb/s", ic->bit_rate / 1000);
2412 av_log(NULL, AV_LOG_INFO, "N/A");
2414 av_log(NULL, AV_LOG_INFO, "\n");
2416 for(i=0;i<ic->nb_streams;i++) {
2417 AVStream *st = ic->streams[i];
2418 avcodec_string(buf, sizeof(buf), &st->codec, is_output);
2419 av_log(NULL, AV_LOG_INFO, " Stream #%d.%d", index, i);
2420 /* the pid is an important information, so we display it */
2421 /* XXX: add a generic system */
2423 flags = ic->oformat->flags;
2425 flags = ic->iformat->flags;
2426 if (flags & AVFMT_SHOW_IDS) {
2427 av_log(NULL, AV_LOG_INFO, "[0x%x]", st->id);
2429 av_log(NULL, AV_LOG_INFO, ": %s\n", buf);
2436 int frame_rate, frame_rate_base;
2439 static AbvEntry frame_abvs[] = {
2440 { "ntsc", 720, 480, 30000, 1001 },
2441 { "pal", 720, 576, 25, 1 },
2442 { "qntsc", 352, 240, 30000, 1001 }, /* VCD compliant ntsc */
2443 { "qpal", 352, 288, 25, 1 }, /* VCD compliant pal */
2444 { "sntsc", 640, 480, 30000, 1001 }, /* square pixel ntsc */
2445 { "spal", 768, 576, 25, 1 }, /* square pixel pal */
2446 { "film", 352, 240, 24, 1 },
2447 { "ntsc-film", 352, 240, 24000, 1001 },
2448 { "sqcif", 128, 96, 0, 0 },
2449 { "qcif", 176, 144, 0, 0 },
2450 { "cif", 352, 288, 0, 0 },
2451 { "4cif", 704, 576, 0, 0 },
2454 int parse_image_size(int *width_ptr, int *height_ptr, const char *str)
2457 int n = sizeof(frame_abvs) / sizeof(AbvEntry);
2459 int frame_width = 0, frame_height = 0;
2462 if (!strcmp(frame_abvs[i].abv, str)) {
2463 frame_width = frame_abvs[i].width;
2464 frame_height = frame_abvs[i].height;
2470 frame_width = strtol(p, (char **)&p, 10);
2473 frame_height = strtol(p, (char **)&p, 10);
2475 if (frame_width <= 0 || frame_height <= 0)
2477 *width_ptr = frame_width;
2478 *height_ptr = frame_height;
2482 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg)
2487 /* First, we check our abbreviation table */
2488 for (i = 0; i < sizeof(frame_abvs)/sizeof(*frame_abvs); ++i)
2489 if (!strcmp(frame_abvs[i].abv, arg)) {
2490 *frame_rate = frame_abvs[i].frame_rate;
2491 *frame_rate_base = frame_abvs[i].frame_rate_base;
2495 /* Then, we try to parse it as fraction */
2496 cp = strchr(arg, '/');
2498 cp = strchr(arg, ':');
2501 *frame_rate = strtol(arg, &cpp, 10);
2502 if (cpp != arg || cpp == cp)
2503 *frame_rate_base = strtol(cp+1, &cpp, 10);
2508 /* Finally we give up and parse it as double */
2509 *frame_rate_base = DEFAULT_FRAME_RATE_BASE; //FIXME use av_d2q()
2510 *frame_rate = (int)(strtod(arg, 0) * (*frame_rate_base) + 0.5);
2512 if (!*frame_rate || !*frame_rate_base)
2519 * - If not a duration:
2520 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
2521 * Time is localtime unless Z is suffixed to the end. In this case GMT
2522 * Return the date in micro seconds since 1970
2524 * HH[:MM[:SS[.m...]]]
2527 int64_t parse_date(const char *datestr, int duration)
2533 static const char *date_fmt[] = {
2537 static const char *time_fmt[] = {
2547 time_t now = time(0);
2549 len = strlen(datestr);
2551 lastch = datestr[len - 1];
2554 is_utc = (lastch == 'z' || lastch == 'Z');
2556 memset(&dt, 0, sizeof(dt));
2561 for (i = 0; i < sizeof(date_fmt) / sizeof(date_fmt[0]); i++) {
2562 q = small_strptime(p, date_fmt[i], &dt);
2572 dt = *localtime(&now);
2574 dt.tm_hour = dt.tm_min = dt.tm_sec = 0;
2579 if (*p == 'T' || *p == 't' || *p == ' ')
2582 for (i = 0; i < sizeof(time_fmt) / sizeof(time_fmt[0]); i++) {
2583 q = small_strptime(p, time_fmt[i], &dt);
2593 q = small_strptime(p, time_fmt[0], &dt);
2595 dt.tm_sec = strtol(p, (char **)&q, 10);
2601 /* Now we have all the fields that we can get */
2606 return now * int64_t_C(1000000);
2610 t = dt.tm_hour * 3600 + dt.tm_min * 60 + dt.tm_sec;
2612 dt.tm_isdst = -1; /* unknown */
2625 for (val = 0, n = 100000; n >= 1; n /= 10, q++) {
2628 val += n * (*q - '0');
2632 return negative ? -t : t;
2635 /* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. Return
2637 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
2647 while (*p != '\0' && *p != '=' && *p != '&') {
2648 if ((q - tag) < sizeof(tag) - 1)
2656 while (*p != '&' && *p != '\0') {
2657 if ((q - arg) < arg_size - 1) {
2667 if (!strcmp(tag, tag1))
2676 /* Return in 'buf' the path with '%d' replaced by number. Also handles
2677 the '%0nd' format where 'n' is the total number of digits and
2678 '%%'. Return 0 if OK, and -1 if format error */
2679 int get_frame_filename(char *buf, int buf_size,
2680 const char *path, int number)
2683 char *q, buf1[20], c;
2684 int nd, len, percentd_found;
2696 while (isdigit(*p)) {
2697 nd = nd * 10 + *p++ - '0';
2700 } while (isdigit(c));
2709 snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
2711 if ((q - buf + len) > buf_size - 1)
2713 memcpy(q, buf1, len);
2721 if ((q - buf) < buf_size - 1)
2725 if (!percentd_found)
2735 * Print nice hexa dump of a buffer
2736 * @param f stream for output
2738 * @param size buffer size
2740 void av_hex_dump(FILE *f, uint8_t *buf, int size)
2744 for(i=0;i<size;i+=16) {
2748 fprintf(f, "%08x ", i);
2751 fprintf(f, " %02x", buf[i+j]);
2756 for(j=0;j<len;j++) {
2758 if (c < ' ' || c > '~')
2760 fprintf(f, "%c", c);
2767 * Print on 'f' a nice dump of a packet
2768 * @param f stream for output
2769 * @param pkt packet to dump
2770 * @param dump_payload true if the payload must be displayed too
2772 //FIXME needs to know the time_base
2773 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload)
2775 fprintf(f, "stream #%d:\n", pkt->stream_index);
2776 fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0));
2777 fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE);
2778 /* DTS is _always_ valid after av_read_frame() */
2779 fprintf(f, " dts=");
2780 if (pkt->dts == AV_NOPTS_VALUE)
2783 fprintf(f, "%0.3f", (double)pkt->dts / AV_TIME_BASE);
2784 /* PTS may be not known if B frames are present */
2785 fprintf(f, " pts=");
2786 if (pkt->pts == AV_NOPTS_VALUE)
2789 fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE);
2791 fprintf(f, " size=%d\n", pkt->size);
2793 av_hex_dump(f, pkt->data, pkt->size);
2796 void url_split(char *proto, int proto_size,
2797 char *authorization, int authorization_size,
2798 char *hostname, int hostname_size,
2800 char *path, int path_size,
2811 while (*p != ':' && *p != '\0') {
2812 if ((q - proto) < proto_size - 1)
2818 if (authorization_size > 0)
2819 authorization[0] = '\0';
2823 if (hostname_size > 0)
2827 char *at,*slash; // PETR: position of '@' character and '/' character
2834 at = strchr(p,'@'); // PETR: get the position of '@'
2835 slash = strchr(p,'/'); // PETR: get position of '/' - end of hostname
2836 if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/'
2838 q = at ? authorization : hostname; // PETR: if '@' exists starting with auth.
2840 while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR:
2841 if (*p == '@') { // PETR: passed '@'
2842 if (authorization_size > 0)
2846 } else if (!at) { // PETR: hostname
2847 if ((q - hostname) < hostname_size - 1)
2850 if ((q - authorization) < authorization_size - 1)
2855 if (hostname_size > 0)
2859 port = strtoul(p, (char **)&p, 10);
2864 pstrcpy(path, path_size, p);
2868 * Set the pts for a given stream
2870 * @param pts_wrap_bits number of bits effectively used by the pts
2871 * (used for wrap control, 33 is the value for MPEG)
2872 * @param pts_num numerator to convert to seconds (MPEG: 1)
2873 * @param pts_den denominator to convert to seconds (MPEG: 90000)
2875 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
2876 int pts_num, int pts_den)
2878 s->pts_wrap_bits = pts_wrap_bits;
2879 s->time_base.num = pts_num;
2880 s->time_base.den = pts_den;
2883 /* fraction handling */
2886 * f = val + (num / den) + 0.5. 'num' is normalized so that it is such
2887 * as 0 <= num < den.
2889 * @param f fractional number
2890 * @param val integer value
2891 * @param num must be >= 0
2892 * @param den must be >= 1
2894 void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
2906 /* set f to (val + 0.5) */
2907 void av_frac_set(AVFrac *f, int64_t val)
2910 f->num = f->den >> 1;
2914 * Fractionnal addition to f: f = f + (incr / f->den)
2916 * @param f fractional number
2917 * @param incr increment, can be positive or negative
2919 void av_frac_add(AVFrac *f, int64_t incr)
2923 num = f->num + incr;
2926 f->val += num / den;
2932 } else if (num >= den) {
2933 f->val += num / den;
2940 * register a new image format
2941 * @param img_fmt Image format descriptor
2943 void av_register_image_format(AVImageFormat *img_fmt)
2947 p = &first_image_format;
2948 while (*p != NULL) p = &(*p)->next;
2950 img_fmt->next = NULL;
2953 /* guess image format */
2954 AVImageFormat *av_probe_image_format(AVProbeData *pd)
2956 AVImageFormat *fmt1, *fmt;
2957 int score, score_max;
2961 for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
2962 if (fmt1->img_probe) {
2963 score = fmt1->img_probe(pd);
2964 if (score > score_max) {
2973 AVImageFormat *guess_image_format(const char *filename)
2975 AVImageFormat *fmt1;
2977 for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
2978 if (fmt1->extensions && match_ext(filename, fmt1->extensions))
2985 * Read an image from a stream.
2986 * @param gb byte stream containing the image
2987 * @param fmt image format, NULL if probing is required
2989 int av_read_image(ByteIOContext *pb, const char *filename,
2991 int (*alloc_cb)(void *, AVImageInfo *info), void *opaque)
2993 char buf[PROBE_BUF_SIZE];
2994 AVProbeData probe_data, *pd = &probe_data;
2999 pd->filename = filename;
3001 pos = url_ftell(pb);
3002 pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
3003 url_fseek(pb, pos, SEEK_SET);
3004 fmt = av_probe_image_format(pd);
3007 return AVERROR_NOFMT;
3008 ret = fmt->img_read(pb, alloc_cb, opaque);
3013 * Write an image to a stream.
3014 * @param pb byte stream for the image output
3015 * @param fmt image format
3016 * @param img image data and informations
3018 int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img)
3020 return fmt->img_write(pb, img);