2 * Various utilities for ffmpeg system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "allformats.h"
29 * @file libavformat/utils.c
30 * Various utility functions for using ffmpeg library.
33 static void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
34 static void av_frac_add(AVFrac *f, int64_t incr);
35 static void av_frac_set(AVFrac *f, int64_t val);
37 /** head of registered input format linked list. */
38 AVInputFormat *first_iformat = NULL;
39 /** head of registered output format linked list. */
40 AVOutputFormat *first_oformat = NULL;
42 void av_register_input_format(AVInputFormat *format)
46 while (*p != NULL) p = &(*p)->next;
51 void av_register_output_format(AVOutputFormat *format)
55 while (*p != NULL) p = &(*p)->next;
60 int match_ext(const char *filename, const char *extensions)
68 ext = strrchr(filename, '.');
74 while (*p != '\0' && *p != ',' && q-ext1<sizeof(ext1)-1)
77 if (!strcasecmp(ext1, ext))
87 AVOutputFormat *guess_format(const char *short_name, const char *filename,
88 const char *mime_type)
90 AVOutputFormat *fmt, *fmt_found;
93 /* specific test for image sequences */
94 #ifdef CONFIG_IMAGE2_MUXER
95 if (!short_name && filename &&
96 av_filename_number_test(filename) &&
97 av_guess_image2_codec(filename) != CODEC_ID_NONE) {
98 return guess_format("image2", NULL, NULL);
101 /* find the proper file type */
105 while (fmt != NULL) {
107 if (fmt->name && short_name && !strcmp(fmt->name, short_name))
109 if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
111 if (filename && fmt->extensions &&
112 match_ext(filename, fmt->extensions)) {
115 if (score > score_max) {
124 AVOutputFormat *guess_stream_format(const char *short_name, const char *filename,
125 const char *mime_type)
127 AVOutputFormat *fmt = guess_format(short_name, filename, mime_type);
130 AVOutputFormat *stream_fmt;
131 char stream_format_name[64];
133 snprintf(stream_format_name, sizeof(stream_format_name), "%s_stream", fmt->name);
134 stream_fmt = guess_format(stream_format_name, NULL, NULL);
144 * Guesses the codec id based upon muxer and filename.
146 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
147 const char *filename, const char *mime_type, enum CodecType type){
148 if(type == CODEC_TYPE_VIDEO){
149 enum CodecID codec_id= CODEC_ID_NONE;
151 #ifdef CONFIG_IMAGE2_MUXER
152 if(!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")){
153 codec_id= av_guess_image2_codec(filename);
156 if(codec_id == CODEC_ID_NONE)
157 codec_id= fmt->video_codec;
159 }else if(type == CODEC_TYPE_AUDIO)
160 return fmt->audio_codec;
162 return CODEC_ID_NONE;
166 * finds AVInputFormat based on input format's short name.
168 AVInputFormat *av_find_input_format(const char *short_name)
171 for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) {
172 if (!strcmp(fmt->name, short_name))
178 /* memory handling */
181 * Default packet destructor.
183 void av_destruct_packet(AVPacket *pkt)
186 pkt->data = NULL; pkt->size = 0;
190 * Allocate the payload of a packet and intialized its fields to default values.
193 * @param size wanted payload size
194 * @return 0 if OK. AVERROR_xxx otherwise.
196 int av_new_packet(AVPacket *pkt, int size)
199 if((unsigned)size > (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
200 return AVERROR_NOMEM;
201 data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
203 return AVERROR_NOMEM;
204 memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
209 pkt->destruct = av_destruct_packet;
214 * Allocate and read the payload of a packet and intialized its fields to default values.
217 * @param size wanted payload size
218 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
220 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
222 int ret= av_new_packet(pkt, size);
227 pkt->pos= url_ftell(s);
229 ret= get_buffer(s, pkt->data, size);
238 /* This is a hack - the packet memory allocation stuff is broken. The
239 packet is allocated if it was not really allocated */
240 int av_dup_packet(AVPacket *pkt)
242 if (pkt->destruct != av_destruct_packet) {
244 /* we duplicate the packet and don't forget to put the padding
246 if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
247 return AVERROR_NOMEM;
248 data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
250 return AVERROR_NOMEM;
252 memcpy(data, pkt->data, pkt->size);
253 memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
255 pkt->destruct = av_destruct_packet;
261 * Allocate the payload of a packet and intialized its fields to default values.
263 * @param filename possible numbered sequence string
264 * @return 1 if a valid numbered sequence string, 0 otherwise.
266 int av_filename_number_test(const char *filename)
269 return filename && (av_get_frame_filename(buf, sizeof(buf), filename, 1)>=0);
275 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
277 AVInputFormat *fmt1, *fmt;
278 int score, score_max;
282 for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) {
283 if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
286 if (fmt1->read_probe) {
287 score = fmt1->read_probe(pd);
288 } else if (fmt1->extensions) {
289 if (match_ext(pd->filename, fmt1->extensions)) {
293 if (score > score_max) {
301 /************************************************************/
302 /* input media file */
305 * Open a media file from an IO stream. 'fmt' must be specified.
307 static const char* format_to_name(void* ptr)
309 AVFormatContext* fc = (AVFormatContext*) ptr;
310 if(fc->iformat) return fc->iformat->name;
311 else if(fc->oformat) return fc->oformat->name;
315 #define OFFSET(x) offsetof(AVFormatContext,x)
316 #define DEFAULT 0 //should be NAN but it doesnt work as its not a constant in glibc as required by ANSI/ISO C
317 //these names are too long to be readable
318 #define E AV_OPT_FLAG_ENCODING_PARAM
319 #define D AV_OPT_FLAG_DECODING_PARAM
321 static const AVOption options[]={
322 {"probesize", NULL, OFFSET(probesize), FF_OPT_TYPE_INT, 32000, 32, INT_MAX, D}, /* 32000 from mpegts.c: 1.0 second at 24Mbit/s */
323 {"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
324 {"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
325 {"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, DEFAULT, INT_MIN, INT_MAX, D|E, "fflags"},
326 {"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_IGNIDX, INT_MIN, INT_MAX, D, "fflags"},
327 {"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_GENPTS, INT_MIN, INT_MAX, D, "fflags"},
328 {"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
329 {"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
337 static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options };
339 #if LIBAVFORMAT_VERSION_INT >= ((51<<16)+(0<<8)+0)
342 void avformat_get_context_defaults(AVFormatContext *s){
343 memset(s, 0, sizeof(AVFormatContext));
345 s->av_class = &av_format_context_class;
347 av_opt_set_defaults(s);
350 AVFormatContext *av_alloc_format_context(void)
353 ic = av_malloc(sizeof(AVFormatContext));
355 avformat_get_context_defaults(ic);
356 ic->av_class = &av_format_context_class;
361 * Allocates all the structures needed to read an input stream.
362 * This does not open the needed codecs for decoding the stream[s].
364 int av_open_input_stream(AVFormatContext **ic_ptr,
365 ByteIOContext *pb, const char *filename,
366 AVInputFormat *fmt, AVFormatParameters *ap)
370 AVFormatParameters default_ap;
374 memset(ap, 0, sizeof(default_ap));
377 if(!ap->prealloced_context)
378 ic = av_alloc_format_context();
388 ic->duration = AV_NOPTS_VALUE;
389 ic->start_time = AV_NOPTS_VALUE;
390 pstrcpy(ic->filename, sizeof(ic->filename), filename);
392 /* allocate private data */
393 if (fmt->priv_data_size > 0) {
394 ic->priv_data = av_mallocz(fmt->priv_data_size);
395 if (!ic->priv_data) {
400 ic->priv_data = NULL;
403 err = ic->iformat->read_header(ic, ap);
408 ic->data_offset = url_ftell(&ic->pb);
414 av_freep(&ic->priv_data);
421 /** Size of probe buffer, for guessing file type from file contents. */
422 #define PROBE_BUF_MIN 2048
423 #define PROBE_BUF_MAX (1<<20)
426 * Open a media file as input. The codec are not opened. Only the file
427 * header (if present) is read.
429 * @param ic_ptr the opened media file handle is put here
430 * @param filename filename to open.
431 * @param fmt if non NULL, force the file format to use
432 * @param buf_size optional buffer size (zero if default is OK)
433 * @param ap additionnal parameters needed when opening the file (NULL if default)
434 * @return 0 if OK. AVERROR_xxx otherwise.
436 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
439 AVFormatParameters *ap)
441 int err, must_open_file, file_opened, probe_size;
442 AVProbeData probe_data, *pd = &probe_data;
443 ByteIOContext pb1, *pb = &pb1;
448 pd->filename = filename;
453 /* guess format if no file can be opened */
454 fmt = av_probe_input_format(pd, 0);
457 /* do not open file if the format does not need it. XXX: specific
458 hack needed to handle RTSP/TCP */
460 if (fmt && (fmt->flags & AVFMT_NOFILE)) {
462 pb= NULL; //FIXME this or memset(pb, 0, sizeof(ByteIOContext)); otherwise its uninitalized
465 if (!fmt || must_open_file) {
466 /* if no file needed do not try to open one */
467 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
473 url_setbufsize(pb, buf_size);
476 for(probe_size= PROBE_BUF_MIN; probe_size<=PROBE_BUF_MAX && !fmt; probe_size<<=1){
477 /* read probe data */
478 pd->buf= av_realloc(pd->buf, probe_size);
479 pd->buf_size = get_buffer(pb, pd->buf, probe_size);
480 if (url_fseek(pb, 0, SEEK_SET) == (offset_t)-EPIPE) {
482 if (url_fopen(pb, filename, URL_RDONLY) < 0) {
488 /* guess file format */
489 fmt = av_probe_input_format(pd, 1);
494 /* if still no format found, error */
500 /* XXX: suppress this hack for redirectors */
501 #ifdef CONFIG_NETWORK
502 if (fmt == &redir_demuxer) {
503 err = redir_open(ic_ptr, pb);
509 /* check filename in case of an image number is expected */
510 if (fmt->flags & AVFMT_NEEDNUMBER) {
511 if (!av_filename_number_test(filename)) {
512 err = AVERROR_NUMEXPECTED;
516 err = av_open_input_stream(ic_ptr, pb, filename, fmt, ap);
529 /*******************************************************/
532 * Read a transport packet from a media file.
534 * This function is absolete and should never be used.
535 * Use av_read_frame() instead.
537 * @param s media file handle
538 * @param pkt is filled
539 * @return 0 if OK. AVERROR_xxx if error.
541 int av_read_packet(AVFormatContext *s, AVPacket *pkt)
543 return s->iformat->read_packet(s, pkt);
546 /**********************************************************/
549 * Get the number of samples of an audio frame. Return (-1) if error.
551 static int get_audio_frame_size(AVCodecContext *enc, int size)
555 if (enc->frame_size <= 1) {
556 int bits_per_sample = av_get_bits_per_sample(enc->codec_id);
558 if (bits_per_sample) {
559 if (enc->channels == 0)
561 frame_size = (size << 3) / (bits_per_sample * enc->channels);
563 /* used for example by ADPCM codecs */
564 if (enc->bit_rate == 0)
566 frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate;
569 frame_size = enc->frame_size;
576 * Return the frame duration in seconds, return 0 if not available.
578 static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
579 AVCodecParserContext *pc, AVPacket *pkt)
585 switch(st->codec->codec_type) {
586 case CODEC_TYPE_VIDEO:
587 if(st->time_base.num*1000LL > st->time_base.den){
588 *pnum = st->time_base.num;
589 *pden = st->time_base.den;
590 }else if(st->codec->time_base.num*1000LL > st->codec->time_base.den){
591 *pnum = st->codec->time_base.num;
592 *pden = st->codec->time_base.den;
593 if (pc && pc->repeat_pict) {
595 *pnum = (*pnum) * (2 + pc->repeat_pict);
599 case CODEC_TYPE_AUDIO:
600 frame_size = get_audio_frame_size(st->codec, pkt->size);
604 *pden = st->codec->sample_rate;
611 static int is_intra_only(AVCodecContext *enc){
612 if(enc->codec_type == CODEC_TYPE_AUDIO){
614 }else if(enc->codec_type == CODEC_TYPE_VIDEO){
615 switch(enc->codec_id){
617 case CODEC_ID_MJPEGB:
619 case CODEC_ID_RAWVIDEO:
620 case CODEC_ID_DVVIDEO:
621 case CODEC_ID_HUFFYUV:
622 case CODEC_ID_FFVHUFF:
633 static int64_t lsb2full(int64_t lsb, int64_t last_ts, int lsb_bits){
634 int64_t mask = lsb_bits < 64 ? (1LL<<lsb_bits)-1 : -1LL;
635 int64_t delta= last_ts - mask/2;
636 return ((lsb - delta)&mask) + delta;
639 static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
640 AVCodecParserContext *pc, AVPacket *pkt)
642 int num, den, presentation_delayed;
643 /* handle wrapping */
644 if(st->cur_dts != AV_NOPTS_VALUE){
645 if(pkt->pts != AV_NOPTS_VALUE)
646 pkt->pts= lsb2full(pkt->pts, st->cur_dts, st->pts_wrap_bits);
647 if(pkt->dts != AV_NOPTS_VALUE)
648 pkt->dts= lsb2full(pkt->dts, st->cur_dts, st->pts_wrap_bits);
651 if (pkt->duration == 0) {
652 compute_frame_duration(&num, &den, st, pc, pkt);
654 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
658 if(is_intra_only(st->codec))
659 pkt->flags |= PKT_FLAG_KEY;
661 /* do we have a video B frame ? */
662 presentation_delayed = 0;
663 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
664 /* XXX: need has_b_frame, but cannot get it if the codec is
666 if (( st->codec->codec_id == CODEC_ID_H264
667 || st->codec->has_b_frames) &&
668 pc && pc->pict_type != FF_B_TYPE)
669 presentation_delayed = 1;
670 /* this may be redundant, but it shouldnt hurt */
671 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
672 presentation_delayed = 1;
675 if(st->cur_dts == AV_NOPTS_VALUE){
676 if(presentation_delayed) st->cur_dts = -pkt->duration;
677 else st->cur_dts = 0;
680 // av_log(NULL, AV_LOG_DEBUG, "IN delayed:%d pts:%"PRId64", dts:%"PRId64" cur_dts:%"PRId64" st:%d pc:%p\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts, pkt->stream_index, pc);
681 /* interpolate PTS and DTS if they are not present */
682 if (presentation_delayed) {
683 /* DTS = decompression time stamp */
684 /* PTS = presentation time stamp */
685 if (pkt->dts == AV_NOPTS_VALUE) {
686 /* if we know the last pts, use it */
687 if(st->last_IP_pts != AV_NOPTS_VALUE)
688 st->cur_dts = pkt->dts = st->last_IP_pts;
690 pkt->dts = st->cur_dts;
692 st->cur_dts = pkt->dts;
694 /* this is tricky: the dts must be incremented by the duration
695 of the frame we are displaying, i.e. the last I or P frame */
696 if (st->last_IP_duration == 0)
697 st->cur_dts += pkt->duration;
699 st->cur_dts += st->last_IP_duration;
700 st->last_IP_duration = pkt->duration;
701 st->last_IP_pts= pkt->pts;
702 /* cannot compute PTS if not present (we can compute it only
703 by knowing the futur */
704 } else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
705 if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
706 int64_t old_diff= FFABS(st->cur_dts - pkt->duration - pkt->pts);
707 int64_t new_diff= FFABS(st->cur_dts - pkt->pts);
708 if(old_diff < new_diff && old_diff < (pkt->duration>>3)){
709 pkt->pts += pkt->duration;
710 // av_log(NULL, AV_LOG_DEBUG, "id:%d old:%"PRId64" new:%"PRId64" dur:%d cur:%"PRId64" size:%d\n", pkt->stream_index, old_diff, new_diff, pkt->duration, st->cur_dts, pkt->size);
714 /* presentation is not delayed : PTS and DTS are the same */
715 if (pkt->pts == AV_NOPTS_VALUE) {
716 if (pkt->dts == AV_NOPTS_VALUE) {
717 pkt->pts = st->cur_dts;
718 pkt->dts = st->cur_dts;
721 st->cur_dts = pkt->dts;
725 st->cur_dts = pkt->pts;
728 st->cur_dts += pkt->duration;
730 // av_log(NULL, AV_LOG_DEBUG, "OUTdelayed:%d pts:%"PRId64", dts:%"PRId64" cur_dts:%"PRId64"\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts);
735 /* key frame computation */
736 switch(st->codec->codec_type) {
737 case CODEC_TYPE_VIDEO:
738 if (pc->pict_type == FF_I_TYPE)
739 pkt->flags |= PKT_FLAG_KEY;
741 case CODEC_TYPE_AUDIO:
742 pkt->flags |= PKT_FLAG_KEY;
750 void av_destruct_packet_nofree(AVPacket *pkt)
752 pkt->data = NULL; pkt->size = 0;
755 static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
761 /* select current input stream component */
764 if (!st->need_parsing || !st->parser) {
765 /* no parsing needed: we just output the packet as is */
766 /* raw data support */
768 compute_pkt_fields(s, st, NULL, pkt);
771 } else if (s->cur_len > 0 && st->discard < AVDISCARD_ALL) {
772 len = av_parser_parse(st->parser, st->codec, &pkt->data, &pkt->size,
773 s->cur_ptr, s->cur_len,
774 s->cur_pkt.pts, s->cur_pkt.dts);
775 s->cur_pkt.pts = AV_NOPTS_VALUE;
776 s->cur_pkt.dts = AV_NOPTS_VALUE;
777 /* increment read pointer */
781 /* return packet if any */
785 pkt->stream_index = st->index;
786 pkt->pts = st->parser->pts;
787 pkt->dts = st->parser->dts;
788 pkt->destruct = av_destruct_packet_nofree;
789 compute_pkt_fields(s, st, st->parser, pkt);
794 av_free_packet(&s->cur_pkt);
798 /* read next packet */
799 ret = av_read_packet(s, &s->cur_pkt);
803 /* return the last frames, if any */
804 for(i = 0; i < s->nb_streams; i++) {
806 if (st->parser && st->need_parsing) {
807 av_parser_parse(st->parser, st->codec,
808 &pkt->data, &pkt->size,
810 AV_NOPTS_VALUE, AV_NOPTS_VALUE);
815 /* no more packets: really terminates parsing */
819 st = s->streams[s->cur_pkt.stream_index];
820 if(st->codec->debug & FF_DEBUG_PTS)
821 av_log(s, AV_LOG_DEBUG, "av_read_packet stream=%d, pts=%"PRId64", dts=%"PRId64", size=%d\n",
822 s->cur_pkt.stream_index,
828 s->cur_ptr = s->cur_pkt.data;
829 s->cur_len = s->cur_pkt.size;
830 if (st->need_parsing && !st->parser) {
831 st->parser = av_parser_init(st->codec->codec_id);
833 /* no parser available : just output the raw packets */
834 st->need_parsing = 0;
835 }else if(st->need_parsing == 2){
836 st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
841 if(st->codec->debug & FF_DEBUG_PTS)
842 av_log(s, AV_LOG_DEBUG, "av_read_frame_internal stream=%d, pts=%"PRId64", dts=%"PRId64", size=%d\n",
852 * Return the next frame of a stream.
854 * The returned packet is valid
855 * until the next av_read_frame() or until av_close_input_file() and
856 * must be freed with av_free_packet. For video, the packet contains
857 * exactly one frame. For audio, it contains an integer number of
858 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
859 * data). If the audio frames have a variable size (e.g. MPEG audio),
860 * then it contains one frame.
862 * pkt->pts, pkt->dts and pkt->duration are always set to correct
863 * values in AV_TIME_BASE unit (and guessed if the format cannot
864 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
865 * has B frames, so it is better to rely on pkt->dts if you do not
866 * decompress the payload.
868 * @return 0 if OK, < 0 if error or end of file.
870 int av_read_frame(AVFormatContext *s, AVPacket *pkt)
874 const int genpts= s->flags & AVFMT_FLAG_GENPTS;
877 pktl = s->packet_buffer;
879 AVPacket *next_pkt= &pktl->pkt;
881 if(genpts && next_pkt->dts != AV_NOPTS_VALUE){
882 while(pktl && next_pkt->pts == AV_NOPTS_VALUE){
883 if( pktl->pkt.stream_index == next_pkt->stream_index
884 && next_pkt->dts < pktl->pkt.dts
885 && pktl->pkt.pts != pktl->pkt.dts //not b frame
886 /*&& pktl->pkt.dts != AV_NOPTS_VALUE*/){
887 next_pkt->pts= pktl->pkt.dts;
891 pktl = s->packet_buffer;
894 if( next_pkt->pts != AV_NOPTS_VALUE
895 || next_pkt->dts == AV_NOPTS_VALUE
897 /* read packet from packet buffer, if there is data */
899 s->packet_buffer = pktl->next;
905 AVPacketList **plast_pktl= &s->packet_buffer;
906 int ret= av_read_frame_internal(s, pkt);
908 if(pktl && ret != -EAGAIN){
915 /* duplicate the packet */
916 if (av_dup_packet(pkt) < 0)
917 return AVERROR_NOMEM;
919 while(*plast_pktl) plast_pktl= &(*plast_pktl)->next; //FIXME maybe maintain pointer to the last?
921 pktl = av_mallocz(sizeof(AVPacketList));
923 return AVERROR_NOMEM;
925 /* add the packet in the buffered packet list */
929 assert(!s->packet_buffer);
930 return av_read_frame_internal(s, pkt);
935 /* XXX: suppress the packet queue */
936 static void flush_packet_queue(AVFormatContext *s)
941 pktl = s->packet_buffer;
944 s->packet_buffer = pktl->next;
945 av_free_packet(&pktl->pkt);
950 /*******************************************************/
953 int av_find_default_stream_index(AVFormatContext *s)
958 if (s->nb_streams <= 0)
960 for(i = 0; i < s->nb_streams; i++) {
962 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
970 * Flush the frame reader.
972 static void av_read_frame_flush(AVFormatContext *s)
977 flush_packet_queue(s);
979 /* free previous packet */
981 if (s->cur_st->parser)
982 av_free_packet(&s->cur_pkt);
989 /* for each stream, reset read state */
990 for(i = 0; i < s->nb_streams; i++) {
994 av_parser_close(st->parser);
997 st->last_IP_pts = AV_NOPTS_VALUE;
998 st->cur_dts = 0; /* we set the current DTS to an unspecified origin */
1003 * Updates cur_dts of all streams based on given timestamp and AVStream.
1005 * Stream ref_st unchanged, others set cur_dts in their native timebase
1006 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
1007 * @param timestamp new dts expressed in time_base of param ref_st
1008 * @param ref_st reference stream giving time_base of param timestamp
1010 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
1013 for(i = 0; i < s->nb_streams; i++) {
1014 AVStream *st = s->streams[i];
1016 st->cur_dts = av_rescale(timestamp,
1017 st->time_base.den * (int64_t)ref_st->time_base.num,
1018 st->time_base.num * (int64_t)ref_st->time_base.den);
1023 * Add a index entry into a sorted list updateing if it is already there.
1025 * @param timestamp timestamp in the timebase of the given stream
1027 int av_add_index_entry(AVStream *st,
1028 int64_t pos, int64_t timestamp, int size, int distance, int flags)
1030 AVIndexEntry *entries, *ie;
1033 if((unsigned)st->nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1036 entries = av_fast_realloc(st->index_entries,
1037 &st->index_entries_allocated_size,
1038 (st->nb_index_entries + 1) *
1039 sizeof(AVIndexEntry));
1043 st->index_entries= entries;
1045 index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY);
1048 index= st->nb_index_entries++;
1049 ie= &entries[index];
1050 assert(index==0 || ie[-1].timestamp < timestamp);
1052 ie= &entries[index];
1053 if(ie->timestamp != timestamp){
1054 if(ie->timestamp <= timestamp)
1056 memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
1057 st->nb_index_entries++;
1058 }else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance
1059 distance= ie->min_distance;
1063 ie->timestamp = timestamp;
1064 ie->min_distance= distance;
1072 * build an index for raw streams using a parser.
1074 static void av_build_index_raw(AVFormatContext *s)
1076 AVPacket pkt1, *pkt = &pkt1;
1081 av_read_frame_flush(s);
1082 url_fseek(&s->pb, s->data_offset, SEEK_SET);
1085 ret = av_read_frame(s, pkt);
1088 if (pkt->stream_index == 0 && st->parser &&
1089 (pkt->flags & PKT_FLAG_KEY)) {
1090 av_add_index_entry(st, st->parser->frame_offset, pkt->dts,
1091 0, 0, AVINDEX_KEYFRAME);
1093 av_free_packet(pkt);
1098 * Returns TRUE if we deal with a raw stream.
1100 * Raw codec data and parsing needed.
1102 static int is_raw_stream(AVFormatContext *s)
1106 if (s->nb_streams != 1)
1109 if (!st->need_parsing)
1115 * Gets the index for a specific timestamp.
1116 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
1117 * the timestamp which is <= the requested one, if backward is 0
1118 * then it will be >=
1119 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1120 * @return < 0 if no such timestamp could be found
1122 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
1125 AVIndexEntry *entries= st->index_entries;
1126 int nb_entries= st->nb_index_entries;
1135 timestamp = entries[m].timestamp;
1136 if(timestamp >= wanted_timestamp)
1138 if(timestamp <= wanted_timestamp)
1141 m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
1143 if(!(flags & AVSEEK_FLAG_ANY)){
1144 while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){
1145 m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
1157 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
1158 * this isnt supposed to be called directly by a user application, but by demuxers
1159 * @param target_ts target timestamp in the time base of the given stream
1160 * @param stream_index stream number
1162 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1163 AVInputFormat *avif= s->iformat;
1164 int64_t pos_min, pos_max, pos, pos_limit;
1165 int64_t ts_min, ts_max, ts;
1166 int64_t start_pos, filesize;
1167 int index, no_change;
1170 if (stream_index < 0)
1174 av_log(s, AV_LOG_DEBUG, "read_seek: %d %"PRId64"\n", stream_index, target_ts);
1178 ts_min= AV_NOPTS_VALUE;
1179 pos_limit= -1; //gcc falsely says it may be uninitalized
1181 st= s->streams[stream_index];
1182 if(st->index_entries){
1185 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()
1186 index= FFMAX(index, 0);
1187 e= &st->index_entries[index];
1189 if(e->timestamp <= target_ts || e->pos == e->min_distance){
1191 ts_min= e->timestamp;
1193 av_log(s, AV_LOG_DEBUG, "using cached pos_min=0x%"PRIx64" dts_min=%"PRId64"\n",
1200 index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
1201 assert(index < st->nb_index_entries);
1203 e= &st->index_entries[index];
1204 assert(e->timestamp >= target_ts);
1206 ts_max= e->timestamp;
1207 pos_limit= pos_max - e->min_distance;
1209 av_log(s, AV_LOG_DEBUG, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64" dts_max=%"PRId64"\n",
1210 pos_max,pos_limit, ts_max);
1215 if(ts_min == AV_NOPTS_VALUE){
1216 pos_min = s->data_offset;
1217 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1218 if (ts_min == AV_NOPTS_VALUE)
1222 if(ts_max == AV_NOPTS_VALUE){
1224 filesize = url_fsize(&s->pb);
1225 pos_max = filesize - 1;
1228 ts_max = avif->read_timestamp(s, stream_index, &pos_max, pos_max + step);
1230 }while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
1231 if (ts_max == AV_NOPTS_VALUE)
1235 int64_t tmp_pos= pos_max + 1;
1236 int64_t tmp_ts= avif->read_timestamp(s, stream_index, &tmp_pos, INT64_MAX);
1237 if(tmp_ts == AV_NOPTS_VALUE)
1241 if(tmp_pos >= filesize)
1247 if(ts_min > ts_max){
1249 }else if(ts_min == ts_max){
1254 while (pos_min < pos_limit) {
1256 av_log(s, AV_LOG_DEBUG, "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%"PRId64" dts_max=%"PRId64"\n",
1260 assert(pos_limit <= pos_max);
1263 int64_t approximate_keyframe_distance= pos_max - pos_limit;
1264 // interpolate position (better than dichotomy)
1265 pos = av_rescale(target_ts - ts_min, pos_max - pos_min, ts_max - ts_min)
1266 + pos_min - approximate_keyframe_distance;
1267 }else if(no_change==1){
1268 // bisection, if interpolation failed to change min or max pos last time
1269 pos = (pos_min + pos_limit)>>1;
1271 // linear search if bisection failed, can only happen if there are very few or no keframes between min/max
1276 else if(pos > pos_limit)
1280 ts = avif->read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
1286 av_log(s, AV_LOG_DEBUG, "%"PRId64" %"PRId64" %"PRId64" / %"PRId64" %"PRId64" %"PRId64" target:%"PRId64" limit:%"PRId64" start:%"PRId64" noc:%d\n", pos_min, pos, pos_max, ts_min, ts, ts_max, target_ts, pos_limit, start_pos, no_change);
1288 assert(ts != AV_NOPTS_VALUE);
1289 if (target_ts <= ts) {
1290 pos_limit = start_pos - 1;
1294 if (target_ts >= ts) {
1300 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
1301 ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
1304 ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1306 ts_max = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
1307 av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" %"PRId64"<=%"PRId64"<=%"PRId64"\n",
1308 pos, ts_min, target_ts, ts_max);
1311 url_fseek(&s->pb, pos, SEEK_SET);
1313 av_update_cur_dts(s, st, ts);
1318 static int av_seek_frame_byte(AVFormatContext *s, int stream_index, int64_t pos, int flags){
1319 int64_t pos_min, pos_max;
1323 if (stream_index < 0)
1326 st= s->streams[stream_index];
1329 pos_min = s->data_offset;
1330 pos_max = url_fsize(&s->pb) - 1;
1332 if (pos < pos_min) pos= pos_min;
1333 else if(pos > pos_max) pos= pos_max;
1335 url_fseek(&s->pb, pos, SEEK_SET);
1338 av_update_cur_dts(s, st, ts);
1343 static int av_seek_frame_generic(AVFormatContext *s,
1344 int stream_index, int64_t timestamp, int flags)
1350 if (!s->index_built) {
1351 if (is_raw_stream(s)) {
1352 av_build_index_raw(s);
1359 st = s->streams[stream_index];
1360 index = av_index_search_timestamp(st, timestamp, flags);
1364 /* now we have found the index, we can seek */
1365 ie = &st->index_entries[index];
1366 av_read_frame_flush(s);
1367 url_fseek(&s->pb, ie->pos, SEEK_SET);
1369 av_update_cur_dts(s, st, ie->timestamp);
1375 * Seek to the key frame at timestamp.
1376 * 'timestamp' in 'stream_index'.
1377 * @param stream_index If stream_index is (-1), a default
1378 * stream is selected, and timestamp is automatically converted
1379 * from AV_TIME_BASE units to the stream specific time_base.
1380 * @param timestamp timestamp in AVStream.time_base units
1381 * or if there is no stream specified then in AV_TIME_BASE units
1382 * @param flags flags which select direction and seeking mode
1383 * @return >= 0 on success
1385 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1390 av_read_frame_flush(s);
1392 if(flags & AVSEEK_FLAG_BYTE)
1393 return av_seek_frame_byte(s, stream_index, timestamp, flags);
1395 if(stream_index < 0){
1396 stream_index= av_find_default_stream_index(s);
1397 if(stream_index < 0)
1400 st= s->streams[stream_index];
1401 /* timestamp for default must be expressed in AV_TIME_BASE units */
1402 timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
1404 st= s->streams[stream_index];
1406 /* first, we try the format specific seek */
1407 if (s->iformat->read_seek)
1408 ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
1415 if(s->iformat->read_timestamp)
1416 return av_seek_frame_binary(s, stream_index, timestamp, flags);
1418 return av_seek_frame_generic(s, stream_index, timestamp, flags);
1421 /*******************************************************/
1424 * Returns TRUE if the stream has accurate timings in any stream.
1426 * @return TRUE if the stream has accurate timings for at least one component.
1428 static int av_has_timings(AVFormatContext *ic)
1433 for(i = 0;i < ic->nb_streams; i++) {
1434 st = ic->streams[i];
1435 if (st->start_time != AV_NOPTS_VALUE &&
1436 st->duration != AV_NOPTS_VALUE)
1443 * Estimate the stream timings from the one of each components.
1445 * Also computes the global bitrate if possible.
1447 static void av_update_stream_timings(AVFormatContext *ic)
1449 int64_t start_time, start_time1, end_time, end_time1;
1453 start_time = MAXINT64;
1454 end_time = MININT64;
1455 for(i = 0;i < ic->nb_streams; i++) {
1456 st = ic->streams[i];
1457 if (st->start_time != AV_NOPTS_VALUE) {
1458 start_time1= av_rescale_q(st->start_time, st->time_base, AV_TIME_BASE_Q);
1459 if (start_time1 < start_time)
1460 start_time = start_time1;
1461 if (st->duration != AV_NOPTS_VALUE) {
1462 end_time1 = start_time1
1463 + av_rescale_q(st->duration, st->time_base, AV_TIME_BASE_Q);
1464 if (end_time1 > end_time)
1465 end_time = end_time1;
1469 if (start_time != MAXINT64) {
1470 ic->start_time = start_time;
1471 if (end_time != MININT64) {
1472 ic->duration = end_time - start_time;
1473 if (ic->file_size > 0) {
1474 /* compute the bit rate */
1475 ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
1476 (double)ic->duration;
1483 static void fill_all_stream_timings(AVFormatContext *ic)
1488 av_update_stream_timings(ic);
1489 for(i = 0;i < ic->nb_streams; i++) {
1490 st = ic->streams[i];
1491 if (st->start_time == AV_NOPTS_VALUE) {
1492 if(ic->start_time != AV_NOPTS_VALUE)
1493 st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q, st->time_base);
1494 if(ic->duration != AV_NOPTS_VALUE)
1495 st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q, st->time_base);
1500 static void av_estimate_timings_from_bit_rate(AVFormatContext *ic)
1502 int64_t filesize, duration;
1506 /* if bit_rate is already set, we believe it */
1507 if (ic->bit_rate == 0) {
1509 for(i=0;i<ic->nb_streams;i++) {
1510 st = ic->streams[i];
1511 bit_rate += st->codec->bit_rate;
1513 ic->bit_rate = bit_rate;
1516 /* if duration is already set, we believe it */
1517 if (ic->duration == AV_NOPTS_VALUE &&
1518 ic->bit_rate != 0 &&
1519 ic->file_size != 0) {
1520 filesize = ic->file_size;
1522 for(i = 0; i < ic->nb_streams; i++) {
1523 st = ic->streams[i];
1524 duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
1525 if (st->start_time == AV_NOPTS_VALUE ||
1526 st->duration == AV_NOPTS_VALUE) {
1528 st->duration = duration;
1535 #define DURATION_MAX_READ_SIZE 250000
1537 /* only usable for MPEG-PS streams */
1538 static void av_estimate_timings_from_pts(AVFormatContext *ic)
1540 AVPacket pkt1, *pkt = &pkt1;
1542 int read_size, i, ret;
1544 int64_t filesize, offset, duration;
1546 /* free previous packet */
1547 if (ic->cur_st && ic->cur_st->parser)
1548 av_free_packet(&ic->cur_pkt);
1551 /* flush packet queue */
1552 flush_packet_queue(ic);
1554 for(i=0;i<ic->nb_streams;i++) {
1555 st = ic->streams[i];
1557 av_parser_close(st->parser);
1562 /* we read the first packets to get the first PTS (not fully
1563 accurate, but it is enough now) */
1564 url_fseek(&ic->pb, 0, 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->start_time == 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 if (st->start_time == AV_NOPTS_VALUE)
1585 st->start_time = pkt->pts;
1587 av_free_packet(pkt);
1590 /* estimate the end time (duration) */
1591 /* XXX: may need to support wrapping */
1592 filesize = ic->file_size;
1593 offset = filesize - DURATION_MAX_READ_SIZE;
1597 url_fseek(&ic->pb, offset, SEEK_SET);
1600 if (read_size >= DURATION_MAX_READ_SIZE)
1602 /* if all info is available, we can stop */
1603 for(i = 0;i < ic->nb_streams; i++) {
1604 st = ic->streams[i];
1605 if (st->duration == AV_NOPTS_VALUE)
1608 if (i == ic->nb_streams)
1611 ret = av_read_packet(ic, pkt);
1614 read_size += pkt->size;
1615 st = ic->streams[pkt->stream_index];
1616 if (pkt->pts != AV_NOPTS_VALUE) {
1617 end_time = pkt->pts;
1618 duration = end_time - st->start_time;
1620 if (st->duration == AV_NOPTS_VALUE ||
1621 st->duration < duration)
1622 st->duration = duration;
1625 av_free_packet(pkt);
1628 fill_all_stream_timings(ic);
1630 url_fseek(&ic->pb, 0, SEEK_SET);
1633 static void av_estimate_timings(AVFormatContext *ic)
1637 /* get the file size, if possible */
1638 if (ic->iformat->flags & AVFMT_NOFILE) {
1641 file_size = url_fsize(&ic->pb);
1645 ic->file_size = file_size;
1647 if ((!strcmp(ic->iformat->name, "mpeg") ||
1648 !strcmp(ic->iformat->name, "mpegts")) &&
1649 file_size && !ic->pb.is_streamed) {
1650 /* get accurate estimate from the PTSes */
1651 av_estimate_timings_from_pts(ic);
1652 } else if (av_has_timings(ic)) {
1653 /* at least one components has timings - we use them for all
1655 fill_all_stream_timings(ic);
1657 /* less precise: use bit rate info */
1658 av_estimate_timings_from_bit_rate(ic);
1660 av_update_stream_timings(ic);
1666 for(i = 0;i < ic->nb_streams; i++) {
1667 st = ic->streams[i];
1668 printf("%d: start_time: %0.3f duration: %0.3f\n",
1669 i, (double)st->start_time / AV_TIME_BASE,
1670 (double)st->duration / AV_TIME_BASE);
1672 printf("stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
1673 (double)ic->start_time / AV_TIME_BASE,
1674 (double)ic->duration / AV_TIME_BASE,
1675 ic->bit_rate / 1000);
1680 static int has_codec_parameters(AVCodecContext *enc)
1683 switch(enc->codec_type) {
1684 case CODEC_TYPE_AUDIO:
1685 val = enc->sample_rate;
1687 case CODEC_TYPE_VIDEO:
1688 val = enc->width && enc->pix_fmt != PIX_FMT_NONE;
1697 static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
1701 int got_picture, ret=0;
1704 if(!st->codec->codec){
1705 codec = avcodec_find_decoder(st->codec->codec_id);
1708 ret = avcodec_open(st->codec, codec);
1713 if(!has_codec_parameters(st->codec)){
1714 switch(st->codec->codec_type) {
1715 case CODEC_TYPE_VIDEO:
1716 ret = avcodec_decode_video(st->codec, &picture,
1717 &got_picture, (uint8_t *)data, size);
1719 case CODEC_TYPE_AUDIO:
1720 samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
1723 ret = avcodec_decode_audio(st->codec, samples,
1724 &got_picture, (uint8_t *)data, size);
1735 /* absolute maximum size we read until we abort */
1736 #define MAX_READ_SIZE 5000000
1738 /* maximum duration until we stop analysing the stream */
1739 #define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 3.0))
1742 * Read the beginning of a media file to get stream information. This
1743 * is useful for file formats with no headers such as MPEG. This
1744 * function also compute the real frame rate in case of mpeg2 repeat
1747 * @param ic media file handle
1748 * @return >=0 if OK. AVERROR_xxx if error.
1749 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
1751 int av_find_stream_info(AVFormatContext *ic)
1753 int i, count, ret, read_size, j;
1755 AVPacket pkt1, *pkt;
1756 AVPacketList *pktl=NULL, **ppktl;
1757 int64_t last_dts[MAX_STREAMS];
1758 int64_t duration_sum[MAX_STREAMS];
1759 int duration_count[MAX_STREAMS]={0};
1761 for(i=0;i<ic->nb_streams;i++) {
1762 st = ic->streams[i];
1763 if(st->codec->codec_type == CODEC_TYPE_VIDEO){
1764 /* if(!st->time_base.num)
1766 if(!st->codec->time_base.num)
1767 st->codec->time_base= st->time_base;
1769 //only for the split stuff
1771 st->parser = av_parser_init(st->codec->codec_id);
1772 if(st->need_parsing == 2 && st->parser){
1773 st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
1778 for(i=0;i<MAX_STREAMS;i++){
1779 last_dts[i]= AV_NOPTS_VALUE;
1780 duration_sum[i]= INT64_MAX;
1785 ppktl = &ic->packet_buffer;
1787 /* check if one codec still needs to be handled */
1788 for(i=0;i<ic->nb_streams;i++) {
1789 st = ic->streams[i];
1790 if (!has_codec_parameters(st->codec))
1792 /* variable fps and no guess at the real fps */
1793 if( st->codec->time_base.den >= 101LL*st->codec->time_base.num
1794 && duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
1796 if(st->parser && st->parser->parser->split && !st->codec->extradata)
1799 if (i == ic->nb_streams) {
1800 /* NOTE: if the format has no header, then we need to read
1801 some packets to get most of the streams, so we cannot
1803 if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
1804 /* if we found the info for all the codecs, we can stop */
1809 /* we did not get all the codec info, but we read too much data */
1810 if (read_size >= MAX_READ_SIZE) {
1815 /* NOTE: a new stream can be added there if no header in file
1816 (AVFMTCTX_NOHEADER) */
1817 ret = av_read_frame_internal(ic, &pkt1);
1820 ret = -1; /* we could not have all the codec parameters before EOF */
1821 for(i=0;i<ic->nb_streams;i++) {
1822 st = ic->streams[i];
1823 if (!has_codec_parameters(st->codec)){
1825 avcodec_string(buf, sizeof(buf), st->codec, 0);
1826 av_log(ic, AV_LOG_INFO, "Could not find codec parameters (%s)\n", buf);
1834 pktl = av_mallocz(sizeof(AVPacketList));
1836 ret = AVERROR_NOMEM;
1840 /* add the packet in the buffered packet list */
1842 ppktl = &pktl->next;
1847 /* duplicate the packet */
1848 if (av_dup_packet(pkt) < 0) {
1849 ret = AVERROR_NOMEM;
1853 read_size += pkt->size;
1855 st = ic->streams[pkt->stream_index];
1856 st->codec_info_duration += pkt->duration;
1857 if (pkt->duration != 0)
1858 st->codec_info_nb_frames++;
1861 int index= pkt->stream_index;
1862 int64_t last= last_dts[index];
1863 int64_t duration= pkt->dts - last;
1865 if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && duration>0){
1866 if(duration*duration_count[index]*10/9 < duration_sum[index]){
1867 duration_sum[index]= duration;
1868 duration_count[index]=1;
1870 int factor= av_rescale(2*duration, duration_count[index], duration_sum[index]);
1872 duration_count[index] *= 2;
1873 factor= av_rescale(duration, duration_count[index], duration_sum[index]);
1874 duration_sum[index] += duration;
1875 duration_count[index]+= factor;
1877 if(st->codec_info_nb_frames == 0 && 0)
1878 st->codec_info_duration += duration;
1880 last_dts[pkt->stream_index]= pkt->dts;
1882 if(st->parser && st->parser->parser->split && !st->codec->extradata){
1883 int i= st->parser->parser->split(st->codec, pkt->data, pkt->size);
1885 st->codec->extradata_size= i;
1886 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1887 memcpy(st->codec->extradata, pkt->data, st->codec->extradata_size);
1888 memset(st->codec->extradata + i, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1892 /* if still no information, we try to open the codec and to
1893 decompress the frame. We try to avoid that in most cases as
1894 it takes longer and uses more memory. For MPEG4, we need to
1895 decompress for Quicktime. */
1896 if (!has_codec_parameters(st->codec) /*&&
1897 (st->codec->codec_id == CODEC_ID_FLV1 ||
1898 st->codec->codec_id == CODEC_ID_H264 ||
1899 st->codec->codec_id == CODEC_ID_H263 ||
1900 st->codec->codec_id == CODEC_ID_H261 ||
1901 st->codec->codec_id == CODEC_ID_VORBIS ||
1902 st->codec->codec_id == CODEC_ID_MJPEG ||
1903 st->codec->codec_id == CODEC_ID_PNG ||
1904 st->codec->codec_id == CODEC_ID_PAM ||
1905 st->codec->codec_id == CODEC_ID_PGM ||
1906 st->codec->codec_id == CODEC_ID_PGMYUV ||
1907 st->codec->codec_id == CODEC_ID_PBM ||
1908 st->codec->codec_id == CODEC_ID_PPM ||
1909 st->codec->codec_id == CODEC_ID_SHORTEN ||
1910 (st->codec->codec_id == CODEC_ID_MPEG4 && !st->need_parsing))*/)
1911 try_decode_frame(st, pkt->data, pkt->size);
1913 if (av_rescale_q(st->codec_info_duration, st->time_base, AV_TIME_BASE_Q) >= MAX_STREAM_DURATION) {
1919 // close codecs which where opened in try_decode_frame()
1920 for(i=0;i<ic->nb_streams;i++) {
1921 st = ic->streams[i];
1922 if(st->codec->codec)
1923 avcodec_close(st->codec);
1925 for(i=0;i<ic->nb_streams;i++) {
1926 st = ic->streams[i];
1927 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
1928 if(st->codec->codec_id == CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_sample)
1929 st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
1931 if(duration_count[i]
1932 && (st->codec->time_base.num*101LL <= st->codec->time_base.den || st->codec->codec_id == CODEC_ID_MPEG2VIDEO) &&
1933 //FIXME we should not special case mpeg2, but this needs testing with non mpeg2 ...
1934 st->time_base.num*duration_sum[i]/duration_count[i]*101LL > st->time_base.den){
1935 int64_t num, den, error, best_error;
1937 num= st->time_base.den*duration_count[i];
1938 den= st->time_base.num*duration_sum[i];
1940 best_error= INT64_MAX;
1941 for(j=1; j<60*12; j++){
1942 error= FFABS(1001*12*num - 1001*j*den);
1943 if(error < best_error){
1945 av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, j, 12, INT_MAX);
1949 static const int ticks[]= {24,30,60};
1950 error= FFABS(1001*12*num - 1000*12*den * ticks[j]);
1951 if(error < best_error){
1953 av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, ticks[j]*1000, 1001, INT_MAX);
1958 if (!st->r_frame_rate.num){
1959 if( st->codec->time_base.den * (int64_t)st->time_base.num
1960 <= st->codec->time_base.num * (int64_t)st->time_base.den){
1961 st->r_frame_rate.num = st->codec->time_base.den;
1962 st->r_frame_rate.den = st->codec->time_base.num;
1964 st->r_frame_rate.num = st->time_base.den;
1965 st->r_frame_rate.den = st->time_base.num;
1971 av_estimate_timings(ic);
1973 /* correct DTS for b frame streams with no timestamps */
1974 for(i=0;i<ic->nb_streams;i++) {
1975 st = ic->streams[i];
1976 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
1978 ppktl = &ic->packet_buffer;
1980 if(ppkt1->stream_index != i)
1982 if(ppkt1->pkt->dts < 0)
1984 if(ppkt1->pkt->pts != AV_NOPTS_VALUE)
1986 ppkt1->pkt->dts -= delta;
1991 st->cur_dts -= delta;
1999 /*******************************************************/
2002 * start playing a network based stream (e.g. RTSP stream) at the
2005 int av_read_play(AVFormatContext *s)
2007 if (!s->iformat->read_play)
2008 return AVERROR_NOTSUPP;
2009 return s->iformat->read_play(s);
2013 * Pause a network based stream (e.g. RTSP stream).
2015 * Use av_read_play() to resume it.
2017 int av_read_pause(AVFormatContext *s)
2019 if (!s->iformat->read_pause)
2020 return AVERROR_NOTSUPP;
2021 return s->iformat->read_pause(s);
2025 * Close a media file (but not its codecs).
2027 * @param s media file handle
2029 void av_close_input_file(AVFormatContext *s)
2031 int i, must_open_file;
2034 /* free previous packet */
2035 if (s->cur_st && s->cur_st->parser)
2036 av_free_packet(&s->cur_pkt);
2038 if (s->iformat->read_close)
2039 s->iformat->read_close(s);
2040 for(i=0;i<s->nb_streams;i++) {
2041 /* free all data in a stream component */
2044 av_parser_close(st->parser);
2046 av_free(st->index_entries);
2047 av_free(st->codec->extradata);
2051 flush_packet_queue(s);
2053 if (s->iformat->flags & AVFMT_NOFILE) {
2056 if (must_open_file) {
2059 av_freep(&s->priv_data);
2064 * Add a new stream to a media file.
2066 * Can only be called in the read_header() function. If the flag
2067 * AVFMTCTX_NOHEADER is in the format context, then new streams
2068 * can be added in read_packet too.
2070 * @param s media file handle
2071 * @param id file format dependent stream id
2073 AVStream *av_new_stream(AVFormatContext *s, int id)
2078 if (s->nb_streams >= MAX_STREAMS)
2081 st = av_mallocz(sizeof(AVStream));
2085 st->codec= avcodec_alloc_context();
2087 /* no default bitrate if decoding */
2088 st->codec->bit_rate = 0;
2090 st->index = s->nb_streams;
2092 st->start_time = AV_NOPTS_VALUE;
2093 st->duration = AV_NOPTS_VALUE;
2094 st->cur_dts = AV_NOPTS_VALUE;
2096 /* default pts settings is MPEG like */
2097 av_set_pts_info(st, 33, 1, 90000);
2098 st->last_IP_pts = AV_NOPTS_VALUE;
2099 for(i=0; i<MAX_REORDER_DELAY+1; i++)
2100 st->pts_buffer[i]= AV_NOPTS_VALUE;
2102 s->streams[s->nb_streams++] = st;
2106 /************************************************************/
2107 /* output media file */
2109 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
2113 if (s->oformat->priv_data_size > 0) {
2114 s->priv_data = av_mallocz(s->oformat->priv_data_size);
2116 return AVERROR_NOMEM;
2118 s->priv_data = NULL;
2120 if (s->oformat->set_parameters) {
2121 ret = s->oformat->set_parameters(s, ap);
2129 * allocate the stream private data and write the stream header to an
2132 * @param s media file handle
2133 * @return 0 if OK. AVERROR_xxx if error.
2135 int av_write_header(AVFormatContext *s)
2140 // some sanity checks
2141 for(i=0;i<s->nb_streams;i++) {
2144 switch (st->codec->codec_type) {
2145 case CODEC_TYPE_AUDIO:
2146 if(st->codec->sample_rate<=0){
2147 av_log(s, AV_LOG_ERROR, "sample rate not set\n");
2151 case CODEC_TYPE_VIDEO:
2152 if(st->codec->time_base.num<=0 || st->codec->time_base.den<=0){ //FIXME audio too?
2153 av_log(s, AV_LOG_ERROR, "time base not set\n");
2156 if(st->codec->width<=0 || st->codec->height<=0){
2157 av_log(s, AV_LOG_ERROR, "dimensions not set\n");
2164 if(s->oformat->write_header){
2165 ret = s->oformat->write_header(s);
2170 /* init PTS generation */
2171 for(i=0;i<s->nb_streams;i++) {
2172 int64_t den = AV_NOPTS_VALUE;
2175 switch (st->codec->codec_type) {
2176 case CODEC_TYPE_AUDIO:
2177 den = (int64_t)st->time_base.num * st->codec->sample_rate;
2179 case CODEC_TYPE_VIDEO:
2180 den = (int64_t)st->time_base.num * st->codec->time_base.den;
2185 if (den != AV_NOPTS_VALUE) {
2187 return AVERROR_INVALIDDATA;
2188 av_frac_init(&st->pts, 0, 0, den);
2194 //FIXME merge with compute_pkt_fields
2195 static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){
2196 int delay = FFMAX(st->codec->has_b_frames, !!st->codec->max_b_frames);
2197 int num, den, frame_size, i;
2199 // av_log(st->codec, AV_LOG_DEBUG, "av_write_frame: pts:%"PRId64" dts:%"PRId64" cur_dts:%"PRId64" b:%d size:%d st:%d\n", pkt->pts, pkt->dts, st->cur_dts, delay, pkt->size, pkt->stream_index);
2201 /* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
2204 /* duration field */
2205 if (pkt->duration == 0) {
2206 compute_frame_duration(&num, &den, st, NULL, pkt);
2208 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
2212 //XXX/FIXME this is a temporary hack until all encoders output pts
2213 if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay){
2215 // pkt->pts= st->cur_dts;
2216 pkt->pts= st->pts.val;
2219 //calculate dts from pts
2220 if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE){
2221 st->pts_buffer[0]= pkt->pts;
2222 for(i=1; i<delay+1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
2223 st->pts_buffer[i]= (i-delay-1) * pkt->duration;
2224 for(i=0; i<delay && st->pts_buffer[i] > st->pts_buffer[i+1]; i++)
2225 FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i+1]);
2227 pkt->dts= st->pts_buffer[0];
2230 if(st->cur_dts && st->cur_dts != AV_NOPTS_VALUE && st->cur_dts >= pkt->dts){
2231 av_log(NULL, AV_LOG_ERROR, "error, non monotone timestamps %"PRId64" >= %"PRId64"\n", st->cur_dts, pkt->dts);
2234 if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
2235 av_log(NULL, AV_LOG_ERROR, "error, pts < dts\n");
2239 // av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts2:%"PRId64" dts2:%"PRId64"\n", pkt->pts, pkt->dts);
2240 st->cur_dts= pkt->dts;
2241 st->pts.val= pkt->dts;
2244 switch (st->codec->codec_type) {
2245 case CODEC_TYPE_AUDIO:
2246 frame_size = get_audio_frame_size(st->codec, pkt->size);
2248 /* HACK/FIXME, we skip the initial 0-size packets as they are most likely equal to the encoder delay,
2249 but it would be better if we had the real timestamps from the encoder */
2250 if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) {
2251 av_frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
2254 case CODEC_TYPE_VIDEO:
2255 av_frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
2263 static void truncate_ts(AVStream *st, AVPacket *pkt){
2264 int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1;
2267 // pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
2269 pkt->pts &= pts_mask;
2270 pkt->dts &= pts_mask;
2274 * Write a packet to an output media file.
2276 * The packet shall contain one audio or video frame.
2278 * @param s media file handle
2279 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2280 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2282 int av_write_frame(AVFormatContext *s, AVPacket *pkt)
2286 ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt);
2287 if(ret<0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
2290 truncate_ts(s->streams[pkt->stream_index], pkt);
2292 ret= s->oformat->write_packet(s, pkt);
2294 ret= url_ferror(&s->pb);
2299 * Interleave a packet per DTS in an output media file.
2301 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
2302 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
2304 * @param s media file handle
2305 * @param out the interleaved packet will be output here
2306 * @param in the input packet
2307 * @param flush 1 if no further packets are available as input and all
2308 * remaining packets should be output
2309 * @return 1 if a packet was output, 0 if no packet could be output,
2310 * < 0 if an error occured
2312 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush){
2313 AVPacketList *pktl, **next_point, *this_pktl;
2315 int streams[MAX_STREAMS];
2318 AVStream *st= s->streams[ pkt->stream_index];
2320 // assert(pkt->destruct != av_destruct_packet); //FIXME
2322 this_pktl = av_mallocz(sizeof(AVPacketList));
2323 this_pktl->pkt= *pkt;
2324 if(pkt->destruct == av_destruct_packet)
2325 pkt->destruct= NULL; // non shared -> must keep original from being freed
2327 av_dup_packet(&this_pktl->pkt); //shared -> must dup
2329 next_point = &s->packet_buffer;
2331 AVStream *st2= s->streams[ (*next_point)->pkt.stream_index];
2332 int64_t left= st2->time_base.num * (int64_t)st ->time_base.den;
2333 int64_t right= st ->time_base.num * (int64_t)st2->time_base.den;
2334 if((*next_point)->pkt.dts * left > pkt->dts * right) //FIXME this can overflow
2336 next_point= &(*next_point)->next;
2338 this_pktl->next= *next_point;
2339 *next_point= this_pktl;
2342 memset(streams, 0, sizeof(streams));
2343 pktl= s->packet_buffer;
2345 //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%"PRId64"\n", pktl->pkt.stream_index, pktl->pkt.dts);
2346 if(streams[ pktl->pkt.stream_index ] == 0)
2348 streams[ pktl->pkt.stream_index ]++;
2352 if(s->nb_streams == stream_count || (flush && stream_count)){
2353 pktl= s->packet_buffer;
2356 s->packet_buffer= pktl->next;
2360 av_init_packet(out);
2366 * Interleaves a AVPacket correctly so it can be muxed.
2367 * @param out the interleaved packet will be output here
2368 * @param in the input packet
2369 * @param flush 1 if no further packets are available as input and all
2370 * remaining packets should be output
2371 * @return 1 if a packet was output, 0 if no packet could be output,
2372 * < 0 if an error occured
2374 static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
2375 if(s->oformat->interleave_packet)
2376 return s->oformat->interleave_packet(s, out, in, flush);
2378 return av_interleave_packet_per_dts(s, out, in, flush);
2382 * Writes a packet to an output media file ensuring correct interleaving.
2384 * The packet must contain one audio or video frame.
2385 * If the packets are already correctly interleaved the application should
2386 * call av_write_frame() instead as its slightly faster, its also important
2387 * to keep in mind that completly non interleaved input will need huge amounts
2388 * of memory to interleave with this, so its prefereable to interleave at the
2391 * @param s media file handle
2392 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
2393 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
2395 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
2396 AVStream *st= s->streams[ pkt->stream_index];
2398 //FIXME/XXX/HACK drop zero sized packets
2399 if(st->codec->codec_type == CODEC_TYPE_AUDIO && pkt->size==0)
2402 //av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %"PRId64" %"PRId64"\n", pkt->size, pkt->dts, pkt->pts);
2403 if(compute_pkt_fields2(st, pkt) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
2406 if(pkt->dts == AV_NOPTS_VALUE)
2411 int ret= av_interleave_packet(s, &opkt, pkt, 0);
2412 if(ret<=0) //FIXME cleanup needed for ret<0 ?
2415 truncate_ts(s->streams[opkt.stream_index], &opkt);
2416 ret= s->oformat->write_packet(s, &opkt);
2418 av_free_packet(&opkt);
2423 if(url_ferror(&s->pb))
2424 return url_ferror(&s->pb);
2429 * @brief Write the stream trailer to an output media file and
2430 * free the file private data.
2432 * @param s media file handle
2433 * @return 0 if OK. AVERROR_xxx if error.
2435 int av_write_trailer(AVFormatContext *s)
2441 ret= av_interleave_packet(s, &pkt, NULL, 1);
2442 if(ret<0) //FIXME cleanup needed for ret<0 ?
2447 truncate_ts(s->streams[pkt.stream_index], &pkt);
2448 ret= s->oformat->write_packet(s, &pkt);
2450 av_free_packet(&pkt);
2454 if(url_ferror(&s->pb))
2458 if(s->oformat->write_trailer)
2459 ret = s->oformat->write_trailer(s);
2462 ret=url_ferror(&s->pb);
2463 for(i=0;i<s->nb_streams;i++)
2464 av_freep(&s->streams[i]->priv_data);
2465 av_freep(&s->priv_data);
2469 /* "user interface" functions */
2471 void dump_format(AVFormatContext *ic,
2479 av_log(NULL, AV_LOG_INFO, "%s #%d, %s, %s '%s':\n",
2480 is_output ? "Output" : "Input",
2482 is_output ? ic->oformat->name : ic->iformat->name,
2483 is_output ? "to" : "from", url);
2485 av_log(NULL, AV_LOG_INFO, " Duration: ");
2486 if (ic->duration != AV_NOPTS_VALUE) {
2487 int hours, mins, secs, us;
2488 secs = ic->duration / AV_TIME_BASE;
2489 us = ic->duration % AV_TIME_BASE;
2494 av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%01d", hours, mins, secs,
2495 (10 * us) / AV_TIME_BASE);
2497 av_log(NULL, AV_LOG_INFO, "N/A");
2499 if (ic->start_time != AV_NOPTS_VALUE) {
2501 av_log(NULL, AV_LOG_INFO, ", start: ");
2502 secs = ic->start_time / AV_TIME_BASE;
2503 us = ic->start_time % AV_TIME_BASE;
2504 av_log(NULL, AV_LOG_INFO, "%d.%06d",
2505 secs, (int)av_rescale(us, 1000000, AV_TIME_BASE));
2507 av_log(NULL, AV_LOG_INFO, ", bitrate: ");
2509 av_log(NULL, AV_LOG_INFO,"%d kb/s", ic->bit_rate / 1000);
2511 av_log(NULL, AV_LOG_INFO, "N/A");
2513 av_log(NULL, AV_LOG_INFO, "\n");
2515 for(i=0;i<ic->nb_streams;i++) {
2516 AVStream *st = ic->streams[i];
2517 int g= ff_gcd(st->time_base.num, st->time_base.den);
2518 avcodec_string(buf, sizeof(buf), st->codec, is_output);
2519 av_log(NULL, AV_LOG_INFO, " Stream #%d.%d", index, i);
2520 /* the pid is an important information, so we display it */
2521 /* XXX: add a generic system */
2523 flags = ic->oformat->flags;
2525 flags = ic->iformat->flags;
2526 if (flags & AVFMT_SHOW_IDS) {
2527 av_log(NULL, AV_LOG_INFO, "[0x%x]", st->id);
2529 if (strlen(st->language) > 0) {
2530 av_log(NULL, AV_LOG_INFO, "(%s)", st->language);
2532 av_log(NULL, AV_LOG_DEBUG, ", %d/%d", st->time_base.num/g, st->time_base.den/g);
2533 av_log(NULL, AV_LOG_INFO, ": %s", buf);
2534 if(st->codec->codec_type == CODEC_TYPE_VIDEO){
2535 if(st->r_frame_rate.den && st->r_frame_rate.num)
2536 av_log(NULL, AV_LOG_INFO, ", %5.2f fps(r)", av_q2d(st->r_frame_rate));
2537 /* else if(st->time_base.den && st->time_base.num)
2538 av_log(NULL, AV_LOG_INFO, ", %5.2f fps(m)", 1/av_q2d(st->time_base));*/
2540 av_log(NULL, AV_LOG_INFO, ", %5.2f fps(c)", 1/av_q2d(st->codec->time_base));
2542 av_log(NULL, AV_LOG_INFO, "\n");
2549 int frame_rate, frame_rate_base;
2552 static AbvEntry frame_abvs[] = {
2553 { "ntsc", 720, 480, 30000, 1001 },
2554 { "pal", 720, 576, 25, 1 },
2555 { "qntsc", 352, 240, 30000, 1001 }, /* VCD compliant ntsc */
2556 { "qpal", 352, 288, 25, 1 }, /* VCD compliant pal */
2557 { "sntsc", 640, 480, 30000, 1001 }, /* square pixel ntsc */
2558 { "spal", 768, 576, 25, 1 }, /* square pixel pal */
2559 { "film", 352, 240, 24, 1 },
2560 { "ntsc-film", 352, 240, 24000, 1001 },
2561 { "sqcif", 128, 96, 0, 0 },
2562 { "qcif", 176, 144, 0, 0 },
2563 { "cif", 352, 288, 0, 0 },
2564 { "4cif", 704, 576, 0, 0 },
2568 * parses width and height out of string str.
2570 int parse_image_size(int *width_ptr, int *height_ptr, const char *str)
2573 int n = sizeof(frame_abvs) / sizeof(AbvEntry);
2575 int frame_width = 0, frame_height = 0;
2578 if (!strcmp(frame_abvs[i].abv, str)) {
2579 frame_width = frame_abvs[i].width;
2580 frame_height = frame_abvs[i].height;
2586 frame_width = strtol(p, (char **)&p, 10);
2589 frame_height = strtol(p, (char **)&p, 10);
2591 if (frame_width <= 0 || frame_height <= 0)
2593 *width_ptr = frame_width;
2594 *height_ptr = frame_height;
2599 * Converts frame rate from string to a fraction.
2601 * First we try to get an exact integer or fractional frame rate.
2602 * If this fails we convert the frame rate to a double and return
2603 * an approximate fraction using the DEFAULT_FRAME_RATE_BASE.
2605 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg)
2610 /* First, we check our abbreviation table */
2611 for (i = 0; i < sizeof(frame_abvs)/sizeof(*frame_abvs); ++i)
2612 if (!strcmp(frame_abvs[i].abv, arg)) {
2613 *frame_rate = frame_abvs[i].frame_rate;
2614 *frame_rate_base = frame_abvs[i].frame_rate_base;
2618 /* Then, we try to parse it as fraction */
2619 cp = strchr(arg, '/');
2621 cp = strchr(arg, ':');
2624 *frame_rate = strtol(arg, &cpp, 10);
2625 if (cpp != arg || cpp == cp)
2626 *frame_rate_base = strtol(cp+1, &cpp, 10);
2631 /* Finally we give up and parse it as double */
2632 AVRational time_base = av_d2q(strtod(arg, 0), DEFAULT_FRAME_RATE_BASE);
2633 *frame_rate_base = time_base.den;
2634 *frame_rate = time_base.num;
2636 if (!*frame_rate || !*frame_rate_base)
2643 * Converts date string to number of seconds since Jan 1st, 1970.
2647 * - If not a duration:
2648 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
2649 * Time is localtime unless Z is suffixed to the end. In this case GMT
2650 * Return the date in micro seconds since 1970
2653 * HH[:MM[:SS[.m...]]]
2657 #ifndef CONFIG_WINCE
2658 int64_t parse_date(const char *datestr, int duration)
2664 static const char *date_fmt[] = {
2668 static const char *time_fmt[] = {
2678 time_t now = time(0);
2680 len = strlen(datestr);
2682 lastch = datestr[len - 1];
2685 is_utc = (lastch == 'z' || lastch == 'Z');
2687 memset(&dt, 0, sizeof(dt));
2692 for (i = 0; i < sizeof(date_fmt) / sizeof(date_fmt[0]); i++) {
2693 q = small_strptime(p, date_fmt[i], &dt);
2703 dt = *localtime(&now);
2705 dt.tm_hour = dt.tm_min = dt.tm_sec = 0;
2710 if (*p == 'T' || *p == 't' || *p == ' ')
2713 for (i = 0; i < sizeof(time_fmt) / sizeof(time_fmt[0]); i++) {
2714 q = small_strptime(p, time_fmt[i], &dt);
2724 q = small_strptime(p, time_fmt[0], &dt);
2726 dt.tm_sec = strtol(p, (char **)&q, 10);
2732 /* Now we have all the fields that we can get */
2737 return now * int64_t_C(1000000);
2741 t = dt.tm_hour * 3600 + dt.tm_min * 60 + dt.tm_sec;
2743 dt.tm_isdst = -1; /* unknown */
2756 for (val = 0, n = 100000; n >= 1; n /= 10, q++) {
2759 val += n * (*q - '0');
2763 return negative ? -t : t;
2765 #endif /* CONFIG_WINCE */
2768 * Attempts to find a specific tag in a URL.
2770 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
2771 * Return 1 if found.
2773 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
2783 while (*p != '\0' && *p != '=' && *p != '&') {
2784 if ((q - tag) < sizeof(tag) - 1)
2792 while (*p != '&' && *p != '\0') {
2793 if ((q - arg) < arg_size - 1) {
2803 if (!strcmp(tag, tag1))
2813 * Returns in 'buf' the path with '%d' replaced by number.
2815 * Also handles the '%0nd' format where 'n' is the total number
2816 * of digits and '%%'.
2818 * @param buf destination buffer
2819 * @param buf_size destination buffer size
2820 * @param path numbered sequence string
2821 * @number frame number
2822 * @return 0 if OK, -1 if format error.
2824 int av_get_frame_filename(char *buf, int buf_size,
2825 const char *path, int number)
2828 char *q, buf1[20], c;
2829 int nd, len, percentd_found;
2841 while (isdigit(*p)) {
2842 nd = nd * 10 + *p++ - '0';
2845 } while (isdigit(c));
2854 snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
2856 if ((q - buf + len) > buf_size - 1)
2858 memcpy(q, buf1, len);
2866 if ((q - buf) < buf_size - 1)
2870 if (!percentd_found)
2880 * Print nice hexa dump of a buffer
2881 * @param f stream for output
2883 * @param size buffer size
2885 void av_hex_dump(FILE *f, uint8_t *buf, int size)
2889 for(i=0;i<size;i+=16) {
2893 fprintf(f, "%08x ", i);
2896 fprintf(f, " %02x", buf[i+j]);
2901 for(j=0;j<len;j++) {
2903 if (c < ' ' || c > '~')
2905 fprintf(f, "%c", c);
2912 * Print on 'f' a nice dump of a packet
2913 * @param f stream for output
2914 * @param pkt packet to dump
2915 * @param dump_payload true if the payload must be displayed too
2917 //FIXME needs to know the time_base
2918 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload)
2920 fprintf(f, "stream #%d:\n", pkt->stream_index);
2921 fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0));
2922 fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE);
2923 /* DTS is _always_ valid after av_read_frame() */
2924 fprintf(f, " dts=");
2925 if (pkt->dts == AV_NOPTS_VALUE)
2928 fprintf(f, "%0.3f", (double)pkt->dts / AV_TIME_BASE);
2929 /* PTS may be not known if B frames are present */
2930 fprintf(f, " pts=");
2931 if (pkt->pts == AV_NOPTS_VALUE)
2934 fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE);
2936 fprintf(f, " size=%d\n", pkt->size);
2938 av_hex_dump(f, pkt->data, pkt->size);
2941 void url_split(char *proto, int proto_size,
2942 char *authorization, int authorization_size,
2943 char *hostname, int hostname_size,
2945 char *path, int path_size,
2956 while (*p != ':' && *p != '\0') {
2957 if ((q - proto) < proto_size - 1)
2963 if (authorization_size > 0)
2964 authorization[0] = '\0';
2968 if (hostname_size > 0)
2972 char *at,*slash; // PETR: position of '@' character and '/' character
2979 at = strchr(p,'@'); // PETR: get the position of '@'
2980 slash = strchr(p,'/'); // PETR: get position of '/' - end of hostname
2981 if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/'
2983 q = at ? authorization : hostname; // PETR: if '@' exists starting with auth.
2985 while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR:
2986 if (*p == '@') { // PETR: passed '@'
2987 if (authorization_size > 0)
2991 } else if (!at) { // PETR: hostname
2992 if ((q - hostname) < hostname_size - 1)
2995 if ((q - authorization) < authorization_size - 1)
3000 if (hostname_size > 0)
3004 port = strtoul(p, (char **)&p, 10);
3009 pstrcpy(path, path_size, p);
3013 * Set the pts for a given stream.
3016 * @param pts_wrap_bits number of bits effectively used by the pts
3017 * (used for wrap control, 33 is the value for MPEG)
3018 * @param pts_num numerator to convert to seconds (MPEG: 1)
3019 * @param pts_den denominator to convert to seconds (MPEG: 90000)
3021 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
3022 int pts_num, int pts_den)
3024 s->pts_wrap_bits = pts_wrap_bits;
3025 s->time_base.num = pts_num;
3026 s->time_base.den = pts_den;
3029 /* fraction handling */
3032 * f = val + (num / den) + 0.5.
3034 * 'num' is normalized so that it is such as 0 <= num < den.
3036 * @param f fractional number
3037 * @param val integer value
3038 * @param num must be >= 0
3039 * @param den must be >= 1
3041 static void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
3054 * Set f to (val + 0.5).
3056 static void av_frac_set(AVFrac *f, int64_t val)
3059 f->num = f->den >> 1;
3063 * Fractionnal addition to f: f = f + (incr / f->den).
3065 * @param f fractional number
3066 * @param incr increment, can be positive or negative
3068 static void av_frac_add(AVFrac *f, int64_t incr)
3072 num = f->num + incr;
3075 f->val += num / den;
3081 } else if (num >= den) {
3082 f->val += num / den;