FFmpeg
internal.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVFORMAT_INTERNAL_H
22 #define AVFORMAT_INTERNAL_H
23 
24 #include <stdint.h>
25 
26 #include "libavcodec/avcodec.h"
27 #include "libavcodec/bsf.h"
28 
29 #include "avformat.h"
30 #include "os_support.h"
31 
32 #define MAX_URL_SIZE 4096
33 
34 /** size of probe buffer, for guessing file type from file contents */
35 #define PROBE_BUF_MIN 2048
36 #define PROBE_BUF_MAX (1 << 20)
37 
38 #ifdef DEBUG
39 # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
40 #else
41 # define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
42 #endif
43 
44 /**
45  * For an AVInputFormat with this flag set read_close() needs to be called
46  * by the caller upon read_header() failure.
47  */
48 #define FF_FMT_INIT_CLEANUP (1 << 0)
49 
50 typedef struct AVCodecTag {
51  enum AVCodecID id;
52  unsigned int tag;
53 } AVCodecTag;
54 
55 typedef struct CodecMime{
56  char str[32];
57  enum AVCodecID id;
58 } CodecMime;
59 
60 /*************************************************/
61 /* fractional numbers for exact pts handling */
62 
63 /**
64  * The exact value of the fractional number is: 'val + num / den'.
65  * num is assumed to be 0 <= num < den.
66  */
67 typedef struct FFFrac {
68  int64_t val, num, den;
69 } FFFrac;
70 
71 
72 typedef struct FFFormatContext {
73  /**
74  * The public context.
75  */
77 
78  /**
79  * Number of streams relevant for interleaving.
80  * Muxing only.
81  */
83 
84  /**
85  * This buffer is only needed when packets were already buffered but
86  * not decoded, for example to get the codec parameters in MPEG
87  * streams.
88  */
91 
92  /* av_seek_frame() support */
93  int64_t data_offset; /**< offset of the first packet */
94 
95  /**
96  * Raw packets from the demuxer, prior to parsing and decoding.
97  * This buffer is used for buffering packets until the codec can
98  * be identified, as parsing cannot be done without knowing the
99  * codec.
100  */
103  /**
104  * Packets split by the parser get queued here.
105  */
108  /**
109  * The generic code uses this as a temporary packet
110  * to parse packets or for muxing, especially flushing.
111  * For demuxers, it may also be used for other means
112  * for short periods that are guaranteed not to overlap
113  * with calls to av_read_frame() (or ff_read_packet())
114  * or with each other.
115  * It may be used by demuxers as a replacement for
116  * stack packets (unless they call one of the aforementioned
117  * functions with their own AVFormatContext).
118  * Every user has to ensure that this packet is blank
119  * after using it.
120  */
122 
123  /**
124  * Used to hold temporary packets for the generic demuxing code.
125  * When muxing, it may be used by muxers to hold packets (even
126  * permanent ones).
127  */
129  /**
130  * Remaining size available for raw_packet_buffer, in bytes.
131  */
132 #define RAW_PACKET_BUFFER_SIZE 2500000
134 
135  /**
136  * Offset to remap timestamps to be non-negative.
137  * Expressed in timebase units.
138  * @see AVStream.mux_ts_offset
139  */
140  int64_t offset;
141 
142  /**
143  * Timebase for the timestamp offset.
144  */
146 
147 #if FF_API_COMPUTE_PKT_FIELDS2
148  int missing_ts_warning;
149 #endif
150 
152 
154 
155  /**
156  * Timestamp of the end of the shortest stream.
157  */
158  int64_t shortest_end;
159 
160  /**
161  * Whether or not avformat_init_output has already been called
162  */
164 
165  /**
166  * Whether or not avformat_init_output fully initialized streams
167  */
169 
170  /**
171  * ID3v2 tag useful for MP3 demuxing
172  */
174 
175  /*
176  * Prefer the codec framerate for avg_frame_rate computation.
177  */
179 
180  /**
181  * Set if chapter ids are strictly monotonic.
182  */
185 
187 {
188  return (FFFormatContext*)s;
189 }
190 
191 typedef struct FFStream {
192  /**
193  * The public context.
194  */
196 
197  /**
198  * Set to 1 if the codec allows reordering, so pts can be different
199  * from dts.
200  */
201  int reorder;
202 
203  /**
204  * bitstream filter to run on stream
205  * - encoding: Set by muxer using ff_stream_add_bitstream_filter
206  * - decoding: unused
207  */
209 
210  /**
211  * Whether or not check_bitstream should still be run on each packet
212  */
214 
215  /**
216  * The codec context used by avformat_find_stream_info, the parser, etc.
217  */
219  /**
220  * 1 if avctx has been initialized with the values from the codec parameters
221  */
223 
224  /* the context for extracting extradata in find_stream_info()
225  * inited=1/bsf=NULL signals that extracting is not possible (codec not
226  * supported) */
227  struct {
229  int inited;
231 
232  /**
233  * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
234  */
236 
238 
240 
241 #define MAX_STD_TIMEBASES (30*12+30+3+6)
242  /**
243  * Stream information used internally by avformat_find_stream_info()
244  */
245  struct {
246  int64_t last_dts;
247  int64_t duration_gcd;
254 
255  /**
256  * 0 -> decoder has not been searched for yet.
257  * >0 -> decoder found
258  * <0 -> decoder with codec_id == -found_decoder has not been found
259  */
261 
262  int64_t last_duration;
263 
264  /**
265  * Those are used for average framerate estimation.
266  */
267  int64_t fps_first_dts;
269  int64_t fps_last_dts;
271 
272  } *info;
273 
274  AVIndexEntry *index_entries; /**< Only used if the format does not
275  support seeking natively. */
278 
281 
282  /**
283  * stream probing state
284  * -1 -> probing finished
285  * 0 -> no probing requested
286  * rest -> perform probing with request_probe being the minimum score to accept.
287  */
289  /**
290  * Indicates that everything up to the next keyframe
291  * should be discarded.
292  */
294 
295  /**
296  * Number of samples to skip at the start of the frame decoded from the next packet.
297  */
299 
300  /**
301  * If not 0, the number of samples that should be skipped from the start of
302  * the stream (the samples are removed from packets with pts==0, which also
303  * assumes negative timestamps do not happen).
304  * Intended for use with formats such as mp3 with ad-hoc gapless audio
305  * support.
306  */
308 
309  /**
310  * If not 0, the first audio sample that should be discarded from the stream.
311  * This is broken by design (needs global sample count), but can't be
312  * avoided for broken by design formats such as mp3 with ad-hoc gapless
313  * audio support.
314  */
316 
317  /**
318  * The sample after last sample that is intended to be discarded after
319  * first_discard_sample. Works on frame boundaries only. Used to prevent
320  * early EOF if the gapless info is broken (considered concatenated mp3s).
321  */
323 
324  /**
325  * Number of internally decoded frames, used internally in libavformat, do not access
326  * its lifetime differs from info which is why it is not in that structure.
327  */
329 
330  /**
331  * Timestamp offset added to timestamps before muxing
332  */
333  int64_t mux_ts_offset;
334 
335  /**
336  * Internal data to check for wrapping of the time stamp
337  */
339 
340  /**
341  * Options for behavior, when a wrap is detected.
342  *
343  * Defined by AV_PTS_WRAP_ values.
344  *
345  * If correction is enabled, there are two possibilities:
346  * If the first time stamp is near the wrap point, the wrap offset
347  * will be subtracted, which will create negative time stamps.
348  * Otherwise the offset will be added.
349  */
351 
352  /**
353  * Internal data to prevent doing update_initial_durations() twice
354  */
356 
357 #define MAX_REORDER_DELAY 16
358 
359  /**
360  * Internal data to generate dts from pts
361  */
364 
366 
367  /**
368  * Internal data to analyze DTS and detect faulty mpeg streams
369  */
371  uint8_t dts_ordered;
372  uint8_t dts_misordered;
373 
374  /**
375  * Internal data to inject global side data
376  */
378 
379  /**
380  * display aspect ratio (0 if unknown)
381  * - encoding: unused
382  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
383  */
385 
387 
388  /**
389  * last packet in packet_buffer for this stream when muxing.
390  */
392 
393  int64_t last_IP_pts;
395 
396  /**
397  * Number of packets to buffer for codec probing
398  */
400 
401  /* av_read_frame() support */
404 
405  /**
406  * Number of frames that have been demuxed during avformat_find_stream_info()
407  */
409 
410  /**
411  * Stream Identifier
412  * This is the MPEG-TS stream identifier +1
413  * 0 means unknown
414  */
416 
417  // Timestamp generation support:
418  /**
419  * Timestamp corresponding to the last dts sync point.
420  *
421  * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
422  * a DTS is received from the underlying container. Otherwise set to
423  * AV_NOPTS_VALUE by default.
424  */
425  int64_t first_dts;
426  int64_t cur_dts;
427 } FFStream;
428 
430 {
431  return (FFStream*)st;
432 }
433 
434 static av_always_inline const FFStream *cffstream(const AVStream *st)
435 {
436  return (FFStream*)st;
437 }
438 
440 
441 #ifdef __GNUC__
442 #define dynarray_add(tab, nb_ptr, elem)\
443 do {\
444  __typeof__(tab) _tab = (tab);\
445  __typeof__(elem) _elem = (elem);\
446  (void)sizeof(**_tab == _elem); /* check that types are compatible */\
447  av_dynarray_add(_tab, nb_ptr, _elem);\
448 } while(0)
449 #else
450 #define dynarray_add(tab, nb_ptr, elem)\
451 do {\
452  av_dynarray_add((tab), nb_ptr, (elem));\
453 } while(0)
454 #endif
455 
456 #define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))
457 
458 static av_always_inline int is_relative(int64_t ts)
459 {
460  return ts > (RELATIVE_TS_BASE - (1LL << 48));
461 }
462 
463 /**
464  * Wrap a given time stamp, if there is an indication for an overflow
465  *
466  * @param st stream
467  * @param timestamp the time stamp to wrap
468  * @return resulting time stamp
469  */
470 int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp);
471 
473 
474 /**
475  * Automatically create sub-directories
476  *
477  * @param path will create sub-directories by path
478  * @return 0, or < 0 on error
479  */
480 int ff_mkdir_p(const char *path);
481 
482 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
483 
484 /**
485  * Parse a string of hexadecimal strings. Any space between the hexadecimal
486  * digits is ignored.
487  *
488  * @param data if non-null, the parsed data is written to this pointer
489  * @param p the string to parse
490  * @return the number of bytes written (or to be written, if data is null)
491  */
492 int ff_hex_to_data(uint8_t *data, const char *p);
493 
494 /**
495  * Add packet to an AVFormatContext's packet_buffer list, determining its
496  * interleaved position using compare() function argument.
497  * @return 0 on success, < 0 on error. pkt will always be blank on return.
498  */
500  int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
501 
503 
504 #define NTP_OFFSET 2208988800ULL
505 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
506 
507 /** Get the current time since NTP epoch in microseconds. */
508 uint64_t ff_ntp_time(void);
509 
510 /**
511  * Get the NTP time stamp formatted as per the RFC-5905.
512  *
513  * @param ntp_time NTP time in micro seconds (since NTP epoch)
514  * @return the formatted NTP time stamp
515  */
516 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
517 
518 /**
519  * Parse the NTP time in micro seconds (since NTP epoch).
520  *
521  * @param ntp_ts NTP time stamp formatted as per the RFC-5905.
522  * @return the time in micro seconds (since NTP epoch)
523  */
524 uint64_t ff_parse_ntp_time(uint64_t ntp_ts);
525 
526 /**
527  * Append the media-specific SDP fragment for the media stream c
528  * to the buffer buff.
529  *
530  * Note, the buffer needs to be initialized, since it is appended to
531  * existing content.
532  *
533  * @param buff the buffer to append the SDP fragment to
534  * @param size the size of the buff buffer
535  * @param st the AVStream of the media to describe
536  * @param idx the global stream index
537  * @param dest_addr the destination address of the media stream, may be NULL
538  * @param dest_type the destination address type, may be NULL
539  * @param port the destination port of the media stream, 0 if unknown
540  * @param ttl the time to live of the stream, 0 if not multicast
541  * @param fmt the AVFormatContext, which might contain options modifying
542  * the generated SDP
543  */
544 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
545  const char *dest_addr, const char *dest_type,
546  int port, int ttl, AVFormatContext *fmt);
547 
548 /**
549  * Write a packet to another muxer than the one the user originally
550  * intended. Useful when chaining muxers, where one muxer internally
551  * writes a received packet to another muxer.
552  *
553  * @param dst the muxer to write the packet to
554  * @param dst_stream the stream index within dst to write the packet to
555  * @param pkt the packet to be written. It will be returned blank when
556  * av_interleaved_write_frame() is used, unchanged otherwise.
557  * @param src the muxer the packet originally was intended for
558  * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
559  * @return the value av_write_frame returned
560  */
561 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
563 
564 /**
565  * Read a whole line of text from AVIOContext. Stop reading after reaching
566  * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
567  * and may be truncated if the buffer is too small.
568  *
569  * @param s the read-only AVIOContext
570  * @param buf buffer to store the read line
571  * @param maxlen size of the buffer
572  * @return the length of the string written in the buffer, not including the
573  * final \\0
574  */
575 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
576 
577 /**
578  * Same as ff_get_line but strip the white-space characters in the text tail
579  *
580  * @param s the read-only AVIOContext
581  * @param buf buffer to store the read line
582  * @param maxlen size of the buffer
583  * @return the length of the string written in the buffer
584  */
585 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
586 
587 #define SPACE_CHARS " \t\r\n"
588 
589 /**
590  * Callback function type for ff_parse_key_value.
591  *
592  * @param key a pointer to the key
593  * @param key_len the number of bytes that belong to the key, including the '='
594  * char
595  * @param dest return the destination pointer for the value in *dest, may
596  * be null to ignore the value
597  * @param dest_len the length of the *dest buffer
598  */
599 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
600  int key_len, char **dest, int *dest_len);
601 /**
602  * Parse a string with comma-separated key=value pairs. The value strings
603  * may be quoted and may contain escaped characters within quoted strings.
604  *
605  * @param str the string to parse
606  * @param callback_get_buf function that returns where to store the
607  * unescaped value string.
608  * @param context the opaque context pointer to pass to callback_get_buf
609  */
610 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
611  void *context);
612 
613 /**
614  * Find stream index based on format-specific stream ID
615  * @return stream index, or < 0 on error
616  */
618 
619 /**
620  * Internal version of av_index_search_timestamp
621  */
622 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
623  int64_t wanted_timestamp, int flags);
624 
625 /**
626  * Internal version of av_add_index_entry
627  */
628 int ff_add_index_entry(AVIndexEntry **index_entries,
629  int *nb_index_entries,
630  unsigned int *index_entries_allocated_size,
631  int64_t pos, int64_t timestamp, int size, int distance, int flags);
632 
633 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
634 
635 /**
636  * Add a new chapter.
637  *
638  * @param s media file handle
639  * @param id unique ID for this chapter
640  * @param start chapter start time in time_base units
641  * @param end chapter end time in time_base units
642  * @param title chapter title
643  *
644  * @return AVChapter or NULL on error
645  */
646 AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
647  int64_t start, int64_t end, const char *title);
648 
649 /**
650  * Ensure the index uses less memory than the maximum specified in
651  * AVFormatContext.max_index_size by discarding entries if it grows
652  * too large.
653  */
654 void ff_reduce_index(AVFormatContext *s, int stream_index);
655 
656 enum AVCodecID ff_guess_image2_codec(const char *filename);
657 
659  enum AVCodecID codec_id);
660 /**
661  * Perform a binary search using av_index_search_timestamp() and
662  * AVInputFormat.read_timestamp().
663  *
664  * @param target_ts target timestamp in the time base of the given stream
665  * @param stream_index stream number
666  */
667 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
668  int64_t target_ts, int flags);
669 
670 /**
671  * Update cur_dts of all streams based on the given timestamp and AVStream.
672  *
673  * Stream ref_st unchanged, others set cur_dts in their native time base.
674  * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
675  * @param timestamp new dts expressed in time_base of param ref_st
676  * @param ref_st reference stream giving time_base of param timestamp
677  */
678 void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
679 
680 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
681  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
682 
683 /**
684  * Perform a binary search using read_timestamp().
685  *
686  * @param target_ts target timestamp in the time base of the given stream
687  * @param stream_index stream number
688  */
689 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
690  int64_t target_ts, int64_t pos_min,
691  int64_t pos_max, int64_t pos_limit,
692  int64_t ts_min, int64_t ts_max,
693  int flags, int64_t *ts_ret,
694  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
695 
696 /**
697  * Set the time base and wrapping info for a given stream. This will be used
698  * to interpret the stream's timestamps. If the new time base is invalid
699  * (numerator or denominator are non-positive), it leaves the stream
700  * unchanged.
701  *
702  * @param st stream
703  * @param pts_wrap_bits number of bits effectively used by the pts
704  * (used for wrap control)
705  * @param pts_num time base numerator
706  * @param pts_den time base denominator
707  */
708 void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
709  unsigned int pts_num, unsigned int pts_den);
710 
711 /**
712  * Add side data to a packet for changing parameters to the given values.
713  * Parameters set to 0 aren't included in the change.
714  */
716  uint64_t channel_layout, int32_t sample_rate,
718 
719 /**
720  * Set the timebase for each stream from the corresponding codec timebase and
721  * print it.
722  */
724 
725 /**
726  * Read a transport packet from a media file.
727  *
728  * @param s media file handle
729  * @param pkt is filled
730  * @return 0 if OK, AVERROR_xxx on error
731  */
733 
734 /**
735  * Add an attached pic to an AVStream.
736  *
737  * @param st if set, the stream to add the attached pic to;
738  * if unset, a new stream will be added to s.
739  * @param pb AVIOContext to read data from if buf is unset.
740  * @param buf if set, it contains the data and size information to be used
741  * for the attached pic; if unset, data is read from pb.
742  * @param size the size of the data to read if buf is unset.
743  *
744  * @return 0 on success, < 0 on error. On error, this function removes
745  * the stream it has added (if any).
746  */
748  AVBufferRef **buf, int size);
749 
750 /**
751  * Interleave an AVPacket per dts so it can be muxed.
752  * See the documentation of AVOutputFormat.interleave_packet for details.
753  */
755  int flush, int has_packet);
756 
758 
759 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
760 
761 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
762 
763 int ff_is_intra_only(enum AVCodecID id);
764 
765 /**
766  * Select a PCM codec based on the given parameters.
767  *
768  * @param bps bits-per-sample
769  * @param flt floating-point
770  * @param be big-endian
771  * @param sflags signed flags. each bit corresponds to one byte of bit depth.
772  * e.g. the 1st bit indicates if 8-bit should be signed or
773  * unsigned, the 2nd bit indicates if 16-bit should be signed or
774  * unsigned, etc... This is useful for formats such as WAVE where
775  * only 8-bit is unsigned and all other bit depths are signed.
776  * @return a PCM codec id or AV_CODEC_ID_NONE
777  */
778 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
779 
780 /**
781  * Chooses a timebase for muxing the specified stream.
782  *
783  * The chosen timebase allows sample accurate timestamps based
784  * on the framerate or sample rate for audio streams. It also is
785  * at least as precise as 1/min_precision would be.
786  */
787 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
788 
789 /**
790  * Chooses a timebase for muxing the specified stream.
791  */
793 
794 /**
795  * Generate standard extradata for AVC-Intra based on width/height and field
796  * order.
797  */
799 
800 /**
801  * Add a bitstream filter to a stream.
802  *
803  * @param st output stream to add a filter to
804  * @param name the name of the filter to add
805  * @param args filter-specific argument string
806  * @return >0 on success;
807  * AVERROR code on failure
808  */
809 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
810 
811 /**
812  * Copy encoding parameters from source to destination stream
813  *
814  * @param dst pointer to destination AVStream
815  * @param src pointer to source AVStream
816  * @return >=0 on success, AVERROR code on error
817  */
819 
820 /**
821  * Wrap ffurl_move() and log if error happens.
822  *
823  * @param url_src source path
824  * @param url_dst destination path
825  * @return 0 or AVERROR on failure
826  */
827 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
828 
829 /**
830  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
831  * which is always set to 0.
832  *
833  * Previously allocated extradata in par will be freed.
834  *
835  * @param size size of extradata
836  * @return 0 if OK, AVERROR_xxx on error
837  */
839 
840 /**
841  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
842  * which is always set to 0 and fill it from pb.
843  *
844  * @param size size of extradata
845  * @return >= 0 if OK, AVERROR_xxx on error
846  */
848 
849 /**
850  * add frame for rfps calculation.
851  *
852  * @param dts timestamp of the i-th frame
853  * @return 0 if OK, AVERROR_xxx on error
854  */
855 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
856 
858 
859 /**
860  * Flags for AVFormatContext.write_uncoded_frame()
861  */
863 
864  /**
865  * Query whether the feature is possible on this stream.
866  * The frame argument is ignored.
867  */
869 
870 };
871 
872 /**
873  * Copies the whilelists from one context to the other
874  */
876 
877 /**
878  * Returned by demuxers to indicate that data was consumed but discarded
879  * (ignored streams or junk data). The framework will re-call the demuxer.
880  */
881 #define FFERROR_REDO FFERRTAG('R','E','D','O')
882 
883 /**
884  * Utility function to open IO stream of output format.
885  *
886  * @param s AVFormatContext
887  * @param url URL or file name to open for writing
888  * @options optional options which will be passed to io_open callback
889  * @return >=0 on success, negative AVERROR in case of failure
890  */
892 
893 /*
894  * A wrapper around AVFormatContext.io_close that should be used
895  * instead of calling the pointer directly.
896  */
898 
899 /**
900  * Utility function to check if the file uses http or https protocol
901  *
902  * @param s AVFormatContext
903  * @param filename URL or file name to open for writing
904  */
905 int ff_is_http_proto(const char *filename);
906 
907 /**
908  * Parse creation_time in AVFormatContext metadata if exists and warn if the
909  * parsing fails.
910  *
911  * @param s AVFormatContext
912  * @param timestamp parsed timestamp in microseconds, only set on successful parsing
913  * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
914  * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
915  */
916 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
917 
918 /**
919  * Standardize creation_time metadata in AVFormatContext to an ISO-8601
920  * timestamp string.
921  *
922  * @param s AVFormatContext
923  * @return <0 on error
924  */
926 
927 #define CONTAINS_PAL 2
928 /**
929  * Reshuffles the lines to use the user specified stride.
930  *
931  * @param ppkt input and output packet
932  * @return negative error code or
933  * 0 if no new packet was allocated
934  * non-zero if a new packet was allocated and ppkt has to be freed
935  * CONTAINS_PAL if in addition to a new packet the old contained a palette
936  */
937 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
938 
939 /**
940  * Retrieves the palette from a packet, either from side data, or
941  * appended to the video data in the packet itself (raw video only).
942  * It is commonly used after a call to ff_reshuffle_raw_rgb().
943  *
944  * Use 0 for the ret parameter to check for side data only.
945  *
946  * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
947  * @param ret return value from ff_reshuffle_raw_rgb(), or 0
948  * @param palette pointer to palette buffer
949  * @return negative error code or
950  * 1 if the packet has a palette, else 0
951  */
952 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
953 
954 struct AVBPrint;
955 /**
956  * Finalize buf into extradata and set its size appropriately.
957  */
958 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
959 
960 /**
961  * Find the next packet in the interleaving queue for the given stream.
962  *
963  * @return a pointer to a packet if one was found, NULL otherwise.
964  */
965 const AVPacket *ff_interleaved_peek(AVFormatContext *s, int stream);
966 
967 int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset);
968 
969 int ff_lock_avformat(void);
970 int ff_unlock_avformat(void);
971 
972 /**
973  * Set AVFormatContext url field to the provided pointer. The pointer must
974  * point to a valid string. The existing url field is freed if necessary. Also
975  * set the legacy filename field to the same string which was provided in url.
976  */
977 void ff_format_set_url(AVFormatContext *s, char *url);
978 
979 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
980 
981 #endif /* AVFORMAT_INTERNAL_H */
be
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it be(in the first position) for now. Options ------- Then comes the options array. This is what will define the user accessible options. For example
AVCodec
AVCodec.
Definition: codec.h:202
FFStream::skip_samples
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet.
Definition: internal.h:298
ff_get_pcm_codec_id
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:368
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
ff_rfps_add_frame
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts)
add frame for rfps calculation.
Definition: demux.c:2155
ff_find_decoder
const AVCodec * ff_find_decoder(AVFormatContext *s, const AVStream *st, enum AVCodecID codec_id)
Definition: utils.c:134
FFStream::inject_global_side_data
int inject_global_side_data
Internal data to inject global side data.
Definition: internal.h:377
ff_ntp_time
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:902
FFFormatContext::prefer_codec_framerate
int prefer_codec_framerate
Definition: internal.h:178
ff_get_extradata
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:469
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:425
FFStream::rfps_duration_sum
int64_t rfps_duration_sum
Definition: internal.h:249
FFStream::duration_gcd
int64_t duration_gcd
Definition: internal.h:247
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
FFStream::last_IP_pts
int64_t last_IP_pts
Definition: internal.h:393
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:186
ff_find_last_ts
int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Definition: seek.c:352
ff_format_output_open
int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options)
Utility function to open IO stream of output format.
Definition: utils.c:1788
FFStream::codec_info_duration_fields
int64_t codec_info_duration_fields
Definition: internal.h:252
FFFormatContext::raw_packet_buffer
struct PacketList * raw_packet_buffer
Raw packets from the demuxer, prior to parsing and decoding.
Definition: internal.h:101
AVCodecTag::id
enum AVCodecID id
Definition: internal.h:51
MAX_STD_TIMEBASES
#define MAX_STD_TIMEBASES
Definition: internal.h:241
ff_gen_search
int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Perform a binary search using read_timestamp().
Definition: seek.c:390
FFStream::codec_info_duration
int64_t codec_info_duration
Definition: internal.h:251
ff_get_formatted_ntp_time
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)
Get the NTP time stamp formatted as per the RFC-5905.
Definition: utils.c:907
ff_free_stream
void ff_free_stream(AVFormatContext *s, AVStream *st)
Definition: utils.c:671
FFStream::first_discard_sample
int64_t first_discard_sample
If not 0, the first audio sample that should be discarded from the stream.
Definition: internal.h:315
FFStream::interleaver_chunk_size
int64_t interleaver_chunk_size
Definition: internal.h:279
ff_add_index_entry
int ff_add_index_entry(AVIndexEntry **index_entries, int *nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Internal version of av_add_index_entry.
Definition: seek.c:59
PacketList
Definition: packet_internal.h:26
data
const char data[16]
Definition: mxf.c:143
FFFormatContext::initialized
int initialized
Whether or not avformat_init_output has already been called.
Definition: internal.h:163
ff_parse_creation_time_metadata
int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds)
Parse creation_time in AVFormatContext metadata if exists and warn if the parsing fails.
Definition: utils.c:1810
ff_parse_ntp_time
uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
Parse the NTP time in micro seconds (since NTP epoch).
Definition: utils.c:929
FFStream::fps_last_dts
int64_t fps_last_dts
Definition: internal.h:269
FFStream::bsfc
AVBSFContext * bsfc
bitstream filter to run on stream
Definition: internal.h:208
AVDictionary
Definition: dict.c:30
ff_get_chomp_line
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
Same as ff_get_line but strip the white-space characters in the text tail.
Definition: aviobuf.c:798
cffstream
static const av_always_inline FFStream * cffstream(const AVStream *st)
Definition: internal.h:434
ff_choose_chroma_location
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:106
FFStream::last_dts_for_order_check
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: internal.h:370
AVWriteUncodedFrameFlags
AVWriteUncodedFrameFlags
Flags for AVFormatContext.write_uncoded_frame()
Definition: internal.h:862
ff_interleave_packet_per_dts
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *pkt, int flush, int has_packet)
Interleave an AVPacket per dts so it can be muxed.
Definition: mux.c:906
os_support.h
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
AVBSFContext
The bitstream filter state.
Definition: bsf.h:47
AVIndexEntry
Definition: avformat.h:789
FFStream::bsf
AVBSFContext * bsf
Definition: internal.h:228
ff_seek_frame_binary
int ff_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().
Definition: seek.c:282
FFFormatContext::shortest_end
int64_t shortest_end
Timestamp of the end of the shortest stream.
Definition: internal.h:158
ff_bprint_to_codecpar_extradata
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf)
Finalize buf into extradata and set its size appropriately.
Definition: utils.c:1860
ff_sdp_write_media
void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
Append the media-specific SDP fragment for the media stream c to the buffer buff.
Definition: sdp.c:833
ff_unlock_avformat
int ff_unlock_avformat(void)
Definition: utils.c:81
ff_is_intra_only
int ff_is_intra_only(enum AVCodecID id)
Definition: utils.c:287
CodecMime
Definition: internal.h:55
FFStream::is_intra_only
int is_intra_only
Definition: internal.h:237
ff_guess_image2_codec
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:109
FFStream::dts_ordered
uint8_t dts_ordered
Definition: internal.h:371
FFStream::last_IP_duration
int last_IP_duration
Definition: internal.h:394
RELATIVE_TS_BASE
#define RELATIVE_TS_BASE
Definition: internal.h:456
bsf.h
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:429
FFStream::inited
int inited
Definition: internal.h:229
AVStreamParseType
AVStreamParseType
Definition: avformat.h:778
FFStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:277
ff_get_line
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:781
AVChapter
Definition: avformat.h:1068
ff_read_packet
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: demux.c:524
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
ff_data_to_hex
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:1098
AVCodecParserContext::dts
int64_t dts
Definition: avcodec.h:2795
FFStream::priv_pts
FFFrac * priv_pts
Definition: internal.h:239
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:638
AVCodecTag
Definition: internal.h:50
ff_write_chained
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src, int interleave)
Write a packet to another muxer than the one the user originally intended.
Definition: mux.c:1307
ff_framehash_write_header
int ff_framehash_write_header(AVFormatContext *s)
Set the timebase for each stream from the corresponding codec timebase and print it.
Definition: framehash.c:24
FFStream::duration_count
int duration_count
Definition: internal.h:248
width
#define width
FFStream::duration_error
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: internal.h:250
s
#define s(width, name)
Definition: cbs_vp9.c:257
FFFormatContext::raw_packet_buffer_remaining_size
int raw_packet_buffer_remaining_size
Definition: internal.h:133
FFStream::frame_delay_evidence
int frame_delay_evidence
Definition: internal.h:253
ff_rename
int ff_rename(const char *url_src, const char *url_dst, void *logctx)
Wrap ffurl_move() and log if error happens.
Definition: avio.c:665
avpriv_stream_set_need_parsing
void avpriv_stream_set_need_parsing(AVStream *st, enum AVStreamParseType type)
Definition: utils.c:99
FFStream::last_in_packet_buffer
struct PacketList * last_in_packet_buffer
last packet in packet_buffer for this stream when muxing.
Definition: internal.h:391
FFStream::nb_decoded_frames
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: internal.h:328
FFFormatContext::raw_packet_buffer_end
struct PacketList * raw_packet_buffer_end
Definition: internal.h:102
FFFormatContext::data_offset
int64_t data_offset
offset of the first packet
Definition: internal.h:93
ff_interleave_add_packet
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt, int(*compare)(AVFormatContext *, const AVPacket *, const AVPacket *))
Add packet to an AVFormatContext's packet_buffer list, determining its interleaved position using com...
Definition: mux.c:802
FFStream::codec_info_nb_frames
int codec_info_nb_frames
Number of frames that have been demuxed during avformat_find_stream_info()
Definition: internal.h:408
channels
channels
Definition: aptx.h:33
FFStream::pts_reorder_error_count
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: internal.h:363
FFStream::display_aspect_ratio
AVRational display_aspect_ratio
display aspect ratio (0 if unknown)
Definition: internal.h:384
codec_id
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
key
const char * key
Definition: hwcontext_opencl.c:168
FFStream::pts_reorder_error
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: internal.h:362
ff_hex_to_data
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:1118
FFFormatContext
Definition: internal.h:72
FFStream::need_parsing
enum AVStreamParseType need_parsing
Definition: internal.h:402
context
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your context
Definition: writing_filters.txt:91
AVFormatContext
Format I/O context.
Definition: avformat.h:1109
FFStream::pub
AVStream pub
The public context.
Definition: internal.h:195
avpriv_update_cur_dts
void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: seek.c:32
FFStream::bitstream_checked
int bitstream_checked
Whether or not check_bitstream should still be run on each packet.
Definition: internal.h:213
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:593
FFStream::avctx_inited
int avctx_inited
1 if avctx has been initialized with the values from the codec parameters
Definition: internal.h:222
ff_choose_timebase
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:91
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ff_get_muxer_ts_offset
int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset)
Definition: mux.c:1028
ff_stream_add_bitstream_filter
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
Add a bitstream filter to a stream.
Definition: utils.c:1739
src
#define src
Definition: vp8dsp.c:255
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:276
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
FFStream::fps_last_dts_idx
int fps_last_dts_idx
Definition: internal.h:270
ff_reshuffle_raw_rgb
int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride)
Reshuffles the lines to use the user specified stride.
Definition: rawutils.c:25
FFStream::interleaver_chunk_duration
int64_t interleaver_chunk_duration
Definition: internal.h:280
FFFormatContext::inject_global_side_data
int inject_global_side_data
Definition: internal.h:151
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
FFStream::fps_first_dts
int64_t fps_first_dts
Those are used for average framerate estimation.
Definition: internal.h:267
FFFormatContext::id3v2_meta
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:173
FFFormatContext::parse_queue
struct PacketList * parse_queue
Packets split by the parser get queued here.
Definition: internal.h:106
interleave
static void interleave(uint8_t *dst, uint8_t *src, int w, int h, int dst_linesize, int src_linesize, enum FilterMode mode, int swap)
Definition: vf_il.c:108
FFFormatContext::packet_buffer_end
struct PacketList * packet_buffer_end
Definition: internal.h:90
options
const OptionDef options[]
FFStream::found_decoder
int found_decoder
0 -> decoder has not been searched for yet.
Definition: internal.h:260
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
FFFormatContext::parse_pkt
AVPacket * parse_pkt
The generic code uses this as a temporary packet to parse packets or for muxing, especially flushing.
Definition: internal.h:121
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:357
FFFrac::val
int64_t val
Definition: internal.h:68
FFStream
Definition: internal.h:191
FFStream::last_discard_sample
int64_t last_discard_sample
The sample after last sample that is intended to be discarded after first_discard_sample.
Definition: internal.h:322
bps
unsigned bps
Definition: movenc.c:1596
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:114
size
int size
Definition: twinvq_data.h:10344
ff_lock_avformat
int ff_lock_avformat(void)
Definition: utils.c:76
FFStream::dts_misordered
uint8_t dts_misordered
Definition: internal.h:372
ff_is_http_proto
int ff_is_http_proto(const char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:1805
height
#define height
MAX_REORDER_DELAY
#define MAX_REORDER_DELAY
Definition: internal.h:357
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
FFStream::pts_wrap_behavior
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: internal.h:350
FFStream::update_initial_durations_done
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: internal.h:355
FFStream::start_skip_samples
int64_t start_skip_samples
If not 0, the number of samples that should be skipped from the start of the stream (the samples are ...
Definition: internal.h:307
ff_interleaved_peek
const AVPacket * ff_interleaved_peek(AVFormatContext *s, int stream)
Find the next packet in the interleaving queue for the given stream.
Definition: mux.c:1044
FFStream::probe_packets
int probe_packets
Number of packets to buffer for codec probing.
Definition: internal.h:399
ff_wrap_timestamp
int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp)
Wrap a given time stamp, if there is an indication for an overflow.
Definition: demux.c:63
FFStream::probe_data
AVProbeData probe_data
Definition: internal.h:386
AVChromaLocation
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:598
FFStream::extract_extradata
struct FFStream::@258 extract_extradata
FFStream::skip_to_keyframe
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: internal.h:293
ff_standardize_creation_time
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:1827
FFStream::mux_ts_offset
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing.
Definition: internal.h:333
AVOutputFormat
Definition: avformat.h:495
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
FFFormatContext::parse_queue_end
struct PacketList * parse_queue_end
Definition: internal.h:107
ff_flush_packet_queue
void ff_flush_packet_queue(AVFormatContext *s)
Definition: utils.c:299
FFStream::reorder
int reorder
Set to 1 if the codec allows reordering, so pts can be different from dts.
Definition: internal.h:201
FFStream::fps_first_dts_idx
int fps_first_dts_idx
Definition: internal.h:268
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FFStream::pts_buffer
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: internal.h:365
avpriv_new_chapter
AVChapter * avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:835
ff_add_param_change
int ff_add_param_change(AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
Add side data to a packet for changing parameters to the given values.
Definition: utils.c:1273
avcodec.h
AVCodecParserContext
Definition: avcodec.h:2775
ff_rfps_calculate
void ff_rfps_calculate(AVFormatContext *ic)
Definition: demux.c:2215
tag
uint32_t tag
Definition: movenc.c:1595
FFStream::last_duration
int64_t last_duration
Definition: internal.h:262
ret
ret
Definition: filter_design.txt:187
ff_get_packet_palette
int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette)
Retrieves the palette from a packet, either from side data, or appended to the video data in the pack...
Definition: utils.c:1836
AVStream
Stream structure.
Definition: avformat.h:857
lowercase
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in lowercase
Definition: writing_filters.txt:89
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
ff_format_set_url
void ff_format_set_url(AVFormatContext *s, char *url)
Set AVFormatContext url field to the provided pointer.
Definition: utils.c:1947
FFStream::info
struct FFStream::@259 * info
Stream information used internally by avformat_find_stream_info()
FFFormatContext::chapter_ids_monotonic
int chapter_ids_monotonic
Set if chapter ids are strictly monotonic.
Definition: internal.h:183
FFFormatContext::packet_buffer
struct PacketList * packet_buffer
This buffer is only needed when packets were already buffered but not decoded, for example to get the...
Definition: internal.h:89
FFFormatContext::offset_timebase
AVRational offset_timebase
Timebase for the timestamp offset.
Definition: internal.h:145
AVCodecContext
main external API structure.
Definition: avcodec.h:383
compare
static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
Definition: vf_find_rect.c:95
ff_stream_encode_params_copy
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
Copy encoding parameters from source to destination stream.
Definition: utils.c:586
ff_reduce_index
void ff_reduce_index(AVFormatContext *s, int stream_index)
Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by dis...
Definition: seek.c:45
FFStream::avctx
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:218
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:347
ff_parse_key_val_cb
void(* ff_parse_key_val_cb)(void *context, const char *key, int key_len, char **dest, int *dest_len)
Callback function type for ff_parse_key_value.
Definition: internal.h:599
ff_index_search_timestamp
int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags)
Internal version of av_index_search_timestamp.
Definition: seek.c:127
FFFormatContext::offset
int64_t offset
Offset to remap timestamps to be non-negative.
Definition: internal.h:140
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:1146
CodecMime::str
char str[32]
Definition: internal.h:56
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:274
ff_format_io_close
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:1798
CodecMime::id
enum AVCodecID id
Definition: internal.h:57
FFFormatContext::streams_initialized
int streams_initialized
Whether or not avformat_init_output fully initialized streams.
Definition: internal.h:168
FFFrac::num
int64_t num
Definition: internal.h:68
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
FFFormatContext::pkt
AVPacket * pkt
Used to hold temporary packets for the generic demuxing code.
Definition: internal.h:128
ff_mkdir_p
int ff_mkdir_p(const char *path)
Automatically create sub-directories.
Definition: utils.c:1064
ff_generate_avci_extradata
int ff_generate_avci_extradata(AVStream *st)
Generate standard extradata for AVC-Intra based on width/height and field order.
Definition: utils.c:1536
FFStream::request_probe
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: internal.h:288
AVPacket
This structure stores compressed data.
Definition: packet.h:350
ff_read_frame_flush
void ff_read_frame_flush(AVFormatContext *s)
Flush the frame reader.
Definition: seek.c:714
ff_find_stream_index
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:1226
AV_WRITE_UNCODED_FRAME_QUERY
@ AV_WRITE_UNCODED_FRAME_QUERY
Query whether the feature is possible on this stream.
Definition: internal.h:868
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:426
int32_t
int32_t
Definition: audioconvert.c:56
convert_header.str
string str
Definition: convert_header.py:20
FFStream::stream_identifier
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: internal.h:415
distance
static float distance(float x, float y, int band)
Definition: nellymoserenc.c:233
FFStream::need_context_update
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
Definition: internal.h:235
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
FFStream::last_dts
int64_t last_dts
Definition: internal.h:246
FFStream::parser
struct AVCodecParserContext * parser
Definition: internal.h:403
read_timestamp
static int64_t read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Definition: seek.c:273
FFFrac
The exact value of the fractional number is: 'val + num / den'.
Definition: internal.h:67
FFFrac::den
int64_t den
Definition: internal.h:68
AVCodecTag::tag
unsigned int tag
Definition: internal.h:52
FFFormatContext::pub
AVFormatContext pub
The public context.
Definition: internal.h:76
avpriv_register_devices
void avpriv_register_devices(const AVOutputFormat *const o[], const AVInputFormat *const i[])
Definition: allformats.c:580
FFStream::pts_wrap_reference
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: internal.h:338
ff_configure_buffers_for_index
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
Definition: seek.c:170
FFFormatContext::nb_interleaved_streams
int nb_interleaved_streams
Number of streams relevant for interleaving.
Definition: internal.h:82
ff_add_attached_pic
int ff_add_attached_pic(AVFormatContext *s, AVStream *st, AVIOContext *pb, AVBufferRef **buf, int size)
Add an attached pic to an AVStream.
Definition: utils.c:250
ff_parse_key_value
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf, void *context)
Parse a string with comma-separated key=value pairs.
Definition: utils.c:1172
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:451
is_relative
static av_always_inline int is_relative(int64_t ts)
Definition: internal.h:458
FFFormatContext::avoid_negative_ts_use_pts
int avoid_negative_ts_use_pts
Definition: internal.h:153