FFmpeg  4.3.7
internal.h
Go to the documentation of this file.
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 "libavutil/bprint.h"
27 #include "avformat.h"
28 #include "os_support.h"
29 
30 #define MAX_URL_SIZE 4096
31 
32 /** size of probe buffer, for guessing file type from file contents */
33 #define PROBE_BUF_MIN 2048
34 #define PROBE_BUF_MAX (1 << 20)
35 
36 #ifdef DEBUG
37 # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
38 #else
39 # define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
40 #endif
41 
42 typedef struct AVCodecTag {
43  enum AVCodecID id;
44  unsigned int tag;
45 } AVCodecTag;
46 
47 typedef struct CodecMime{
48  char str[32];
49  enum AVCodecID id;
50 } CodecMime;
51 
52 /*************************************************/
53 /* fractional numbers for exact pts handling */
54 
55 /**
56  * The exact value of the fractional number is: 'val + num / den'.
57  * num is assumed to be 0 <= num < den.
58  */
59 typedef struct FFFrac {
60  int64_t val, num, den;
61 } FFFrac;
62 
63 
65  /**
66  * Number of streams relevant for interleaving.
67  * Muxing only.
68  */
70 
71  /**
72  * This buffer is only needed when packets were already buffered but
73  * not decoded, for example to get the codec parameters in MPEG
74  * streams.
75  */
78 
79  /* av_seek_frame() support */
80  int64_t data_offset; /**< offset of the first packet */
81 
82  /**
83  * Raw packets from the demuxer, prior to parsing and decoding.
84  * This buffer is used for buffering packets until the codec can
85  * be identified, as parsing cannot be done without knowing the
86  * codec.
87  */
90  /**
91  * Packets split by the parser get queued here.
92  */
95  /**
96  * Remaining size available for raw_packet_buffer, in bytes.
97  */
98 #define RAW_PACKET_BUFFER_SIZE 2500000
100 
101  /**
102  * Offset to remap timestamps to be non-negative.
103  * Expressed in timebase units.
104  * @see AVStream.mux_ts_offset
105  */
106  int64_t offset;
107 
108  /**
109  * Timebase for the timestamp offset.
110  */
112 
113 #if FF_API_COMPUTE_PKT_FIELDS2
114  int missing_ts_warning;
115 #endif
116 
118 
120 
121  /**
122  * Timestamp of the end of the shortest stream.
123  */
124  int64_t shortest_end;
125 
126  /**
127  * Whether or not avformat_init_output has already been called
128  */
130 
131  /**
132  * Whether or not avformat_init_output fully initialized streams
133  */
135 
136  /**
137  * ID3v2 tag useful for MP3 demuxing
138  */
140 
141  /*
142  * Prefer the codec framerate for avg_frame_rate computation.
143  */
145 };
146 
148  /**
149  * Set to 1 if the codec allows reordering, so pts can be different
150  * from dts.
151  */
152  int reorder;
153 
154  /**
155  * bitstream filter to run on stream
156  * - encoding: Set by muxer using ff_stream_add_bitstream_filter
157  * - decoding: unused
158  */
160 
161  /**
162  * Whether or not check_bitstream should still be run on each packet
163  */
165 
166  /**
167  * The codec context used by avformat_find_stream_info, the parser, etc.
168  */
170  /**
171  * 1 if avctx has been initialized with the values from the codec parameters
172  */
174 
175  enum AVCodecID orig_codec_id;
176 
177  /* the context for extracting extradata in find_stream_info()
178  * inited=1/bsf=NULL signals that extracting is not possible (codec not
179  * supported) */
180  struct {
183  int inited;
185 
186  /**
187  * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
188  */
190 
192 
194 };
195 
196 #ifdef __GNUC__
197 #define dynarray_add(tab, nb_ptr, elem)\
198 do {\
199  __typeof__(tab) _tab = (tab);\
200  __typeof__(elem) _elem = (elem);\
201  (void)sizeof(**_tab == _elem); /* check that types are compatible */\
202  av_dynarray_add(_tab, nb_ptr, _elem);\
203 } while(0)
204 #else
205 #define dynarray_add(tab, nb_ptr, elem)\
206 do {\
207  av_dynarray_add((tab), nb_ptr, (elem));\
208 } while(0)
209 #endif
210 
211 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
212 
213 /**
214  * Automatically create sub-directories
215  *
216  * @param path will create sub-directories by path
217  * @return 0, or < 0 on error
218  */
219 int ff_mkdir_p(const char *path);
220 
221 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
222 
223 /**
224  * Parse a string of hexadecimal strings. Any space between the hexadecimal
225  * digits is ignored.
226  *
227  * @param data if non-null, the parsed data is written to this pointer
228  * @param p the string to parse
229  * @return the number of bytes written (or to be written, if data is null)
230  */
231 int ff_hex_to_data(uint8_t *data, const char *p);
232 
233 /**
234  * Add packet to an AVFormatContext's packet_buffer list, determining its
235  * interleaved position using compare() function argument.
236  * @return 0 on success, < 0 on error. pkt will always be blank on return.
237  */
239  int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
240 
242 
243 #define NTP_OFFSET 2208988800ULL
244 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
245 
246 /** Get the current time since NTP epoch in microseconds. */
247 uint64_t ff_ntp_time(void);
248 
249 /**
250  * Get the NTP time stamp formatted as per the RFC-5905.
251  *
252  * @param ntp_time NTP time in micro seconds (since NTP epoch)
253  * @return the formatted NTP time stamp
254  */
255 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
256 
257 /**
258  * Append the media-specific SDP fragment for the media stream c
259  * to the buffer buff.
260  *
261  * Note, the buffer needs to be initialized, since it is appended to
262  * existing content.
263  *
264  * @param buff the buffer to append the SDP fragment to
265  * @param size the size of the buff buffer
266  * @param st the AVStream of the media to describe
267  * @param idx the global stream index
268  * @param dest_addr the destination address of the media stream, may be NULL
269  * @param dest_type the destination address type, may be NULL
270  * @param port the destination port of the media stream, 0 if unknown
271  * @param ttl the time to live of the stream, 0 if not multicast
272  * @param fmt the AVFormatContext, which might contain options modifying
273  * the generated SDP
274  */
275 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
276  const char *dest_addr, const char *dest_type,
277  int port, int ttl, AVFormatContext *fmt);
278 
279 /**
280  * Write a packet to another muxer than the one the user originally
281  * intended. Useful when chaining muxers, where one muxer internally
282  * writes a received packet to another muxer.
283  *
284  * @param dst the muxer to write the packet to
285  * @param dst_stream the stream index within dst to write the packet to
286  * @param pkt the packet to be written
287  * @param src the muxer the packet originally was intended for
288  * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
289  * @return the value av_write_frame returned
290  */
291 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
293 
294 /**
295  * Read a whole line of text from AVIOContext. Stop reading after reaching
296  * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
297  * and may be truncated if the buffer is too small.
298  *
299  * @param s the read-only AVIOContext
300  * @param buf buffer to store the read line
301  * @param maxlen size of the buffer
302  * @return the length of the string written in the buffer, not including the
303  * final \\0
304  */
305 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
306 
307 /**
308  * Same as ff_get_line but strip the white-space characters in the text tail
309  *
310  * @param s the read-only AVIOContext
311  * @param buf buffer to store the read line
312  * @param maxlen size of the buffer
313  * @return the length of the string written in the buffer
314  */
315 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
316 
317 /**
318  * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
319  * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
320  * ending characters are NOT included in the buffer, but they are skipped on
321  * the input.
322  *
323  * @param s the read-only AVIOContext
324  * @param bp the AVBPrint buffer
325  * @return the length of the read line, not including the line endings,
326  * negative on error.
327  */
328 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
329 
330 /**
331  * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
332  * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
333  * EOF. The line ending characters are NOT included in the buffer, but they
334  * are skipped on the input.
335  *
336  * @param s the read-only AVIOContext
337  * @param bp the AVBPrint buffer
338  * @return the length of the read line not including the line endings,
339  * negative on error, or if the buffer becomes truncated.
340  */
341 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
342 
343 #define SPACE_CHARS " \t\r\n"
344 
345 /**
346  * Callback function type for ff_parse_key_value.
347  *
348  * @param key a pointer to the key
349  * @param key_len the number of bytes that belong to the key, including the '='
350  * char
351  * @param dest return the destination pointer for the value in *dest, may
352  * be null to ignore the value
353  * @param dest_len the length of the *dest buffer
354  */
355 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
356  int key_len, char **dest, int *dest_len);
357 /**
358  * Parse a string with comma-separated key=value pairs. The value strings
359  * may be quoted and may contain escaped characters within quoted strings.
360  *
361  * @param str the string to parse
362  * @param callback_get_buf function that returns where to store the
363  * unescaped value string.
364  * @param context the opaque context pointer to pass to callback_get_buf
365  */
366 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
367  void *context);
368 
369 /**
370  * Find stream index based on format-specific stream ID
371  * @return stream index, or < 0 on error
372  */
373 int ff_find_stream_index(AVFormatContext *s, int id);
374 
375 /**
376  * Internal version of av_index_search_timestamp
377  */
378 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
379  int64_t wanted_timestamp, int flags);
380 
381 /**
382  * Internal version of av_add_index_entry
383  */
384 int ff_add_index_entry(AVIndexEntry **index_entries,
385  int *nb_index_entries,
386  unsigned int *index_entries_allocated_size,
387  int64_t pos, int64_t timestamp, int size, int distance, int flags);
388 
389 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
390 
391 /**
392  * Add a new chapter.
393  *
394  * @param s media file handle
395  * @param id unique ID for this chapter
396  * @param start chapter start time in time_base units
397  * @param end chapter end time in time_base units
398  * @param title chapter title
399  *
400  * @return AVChapter or NULL on error
401  */
403  int64_t start, int64_t end, const char *title);
404 
405 /**
406  * Ensure the index uses less memory than the maximum specified in
407  * AVFormatContext.max_index_size by discarding entries if it grows
408  * too large.
409  */
410 void ff_reduce_index(AVFormatContext *s, int stream_index);
411 
412 enum AVCodecID ff_guess_image2_codec(const char *filename);
413 
414 /**
415  * Perform a binary search using av_index_search_timestamp() and
416  * AVInputFormat.read_timestamp().
417  *
418  * @param target_ts target timestamp in the time base of the given stream
419  * @param stream_index stream number
420  */
421 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
422  int64_t target_ts, int flags);
423 
424 /**
425  * Update cur_dts of all streams based on the given timestamp and AVStream.
426  *
427  * Stream ref_st unchanged, others set cur_dts in their native time base.
428  * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
429  * @param timestamp new dts expressed in time_base of param ref_st
430  * @param ref_st reference stream giving time_base of param timestamp
431  */
432 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
433 
434 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
435  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
436 
437 /**
438  * Perform a binary search using read_timestamp().
439  *
440  * @param target_ts target timestamp in the time base of the given stream
441  * @param stream_index stream number
442  */
443 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
444  int64_t target_ts, int64_t pos_min,
445  int64_t pos_max, int64_t pos_limit,
446  int64_t ts_min, int64_t ts_max,
447  int flags, int64_t *ts_ret,
448  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
449 
450 /**
451  * Set the time base and wrapping info for a given stream. This will be used
452  * to interpret the stream's timestamps. If the new time base is invalid
453  * (numerator or denominator are non-positive), it leaves the stream
454  * unchanged.
455  *
456  * @param s stream
457  * @param pts_wrap_bits number of bits effectively used by the pts
458  * (used for wrap control)
459  * @param pts_num time base numerator
460  * @param pts_den time base denominator
461  */
462 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
463  unsigned int pts_num, unsigned int pts_den);
464 
465 /**
466  * Add side data to a packet for changing parameters to the given values.
467  * Parameters set to 0 aren't included in the change.
468  */
470  uint64_t channel_layout, int32_t sample_rate,
472 
473 /**
474  * Set the timebase for each stream from the corresponding codec timebase and
475  * print it.
476  */
478 
479 /**
480  * Read a transport packet from a media file.
481  *
482  * @param s media file handle
483  * @param pkt is filled
484  * @return 0 if OK, AVERROR_xxx on error
485  */
487 
488 /**
489  * Interleave an AVPacket per dts so it can be muxed.
490  *
491  * @param s an AVFormatContext for output. pkt resp. out will be added to
492  * resp. taken from its packet buffer.
493  * @param out the interleaved packet will be output here
494  * @param pkt the input packet; will be blank on return if not NULL
495  * @param flush 1 if no further packets are available as input and all
496  * remaining packets should be output
497  * @return 1 if a packet was output, 0 if no packet could be output
498  * (in which case out may be uninitialized), < 0 if an error occurred
499  */
501  AVPacket *pkt, int flush);
502 
504 
505 /**
506  * Return the frame duration in seconds. Return 0 if not available.
507  */
508 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
509  AVCodecParserContext *pc, AVPacket *pkt);
510 
511 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
512 
513 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
514 
515 int ff_is_intra_only(enum AVCodecID id);
516 
517 /**
518  * Select a PCM codec based on the given parameters.
519  *
520  * @param bps bits-per-sample
521  * @param flt floating-point
522  * @param be big-endian
523  * @param sflags signed flags. each bit corresponds to one byte of bit depth.
524  * e.g. the 1st bit indicates if 8-bit should be signed or
525  * unsigned, the 2nd bit indicates if 16-bit should be signed or
526  * unsigned, etc... This is useful for formats such as WAVE where
527  * only 8-bit is unsigned and all other bit depths are signed.
528  * @return a PCM codec id or AV_CODEC_ID_NONE
529  */
530 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
531 
532 /**
533  * Chooses a timebase for muxing the specified stream.
534  *
535  * The chosen timebase allows sample accurate timestamps based
536  * on the framerate or sample rate for audio streams. It also is
537  * at least as precise as 1/min_precision would be.
538  */
539 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
540 
541 /**
542  * Chooses a timebase for muxing the specified stream.
543  */
545 
546 /**
547  * Generate standard extradata for AVC-Intra based on width/height and field
548  * order.
549  */
551 
552 /**
553  * Add a bitstream filter to a stream.
554  *
555  * @param st output stream to add a filter to
556  * @param name the name of the filter to add
557  * @param args filter-specific argument string
558  * @return >0 on success;
559  * AVERROR code on failure
560  */
561 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
562 
563 /**
564  * Copy encoding parameters from source to destination stream
565  *
566  * @param dst pointer to destination AVStream
567  * @param src pointer to source AVStream
568  * @return >=0 on success, AVERROR code on error
569  */
571 
572 /**
573  * Wrap avpriv_io_move and log if error happens.
574  *
575  * @param url_src source path
576  * @param url_dst destination path
577  * @return 0 or AVERROR on failure
578  */
579 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
580 
581 /**
582  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
583  * which is always set to 0.
584  *
585  * Previously allocated extradata in par will be freed.
586  *
587  * @param size size of extradata
588  * @return 0 if OK, AVERROR_xxx on error
589  */
591 
592 /**
593  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
594  * which is always set to 0 and fill it from pb.
595  *
596  * @param size size of extradata
597  * @return >= 0 if OK, AVERROR_xxx on error
598  */
600 
601 /**
602  * add frame for rfps calculation.
603  *
604  * @param dts timestamp of the i-th frame
605  * @return 0 if OK, AVERROR_xxx on error
606  */
607 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
608 
610 
611 /**
612  * Flags for AVFormatContext.write_uncoded_frame()
613  */
615 
616  /**
617  * Query whether the feature is possible on this stream.
618  * The frame argument is ignored.
619  */
621 
622 };
623 
624 /**
625  * Copies the whilelists from one context to the other
626  */
628 
629 /**
630  * Returned by demuxers to indicate that data was consumed but discarded
631  * (ignored streams or junk data). The framework will re-call the demuxer.
632  */
633 #define FFERROR_REDO FFERRTAG('R','E','D','O')
634 
635 /**
636  * Utility function to open IO stream of output format.
637  *
638  * @param s AVFormatContext
639  * @param url URL or file name to open for writing
640  * @options optional options which will be passed to io_open callback
641  * @return >=0 on success, negative AVERROR in case of failure
642  */
643 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
644 
645 /*
646  * A wrapper around AVFormatContext.io_close that should be used
647  * instead of calling the pointer directly.
648  */
650 
651 /**
652  * Utility function to check if the file uses http or https protocol
653  *
654  * @param s AVFormatContext
655  * @param filename URL or file name to open for writing
656  */
657 int ff_is_http_proto(char *filename);
658 
659 /**
660  * Parse creation_time in AVFormatContext metadata if exists and warn if the
661  * parsing fails.
662  *
663  * @param s AVFormatContext
664  * @param timestamp parsed timestamp in microseconds, only set on successful parsing
665  * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
666  * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
667  */
668 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
669 
670 /**
671  * Standardize creation_time metadata in AVFormatContext to an ISO-8601
672  * timestamp string.
673  *
674  * @param s AVFormatContext
675  * @return <0 on error
676  */
678 
679 #define CONTAINS_PAL 2
680 /**
681  * Reshuffles the lines to use the user specified stride.
682  *
683  * @param ppkt input and output packet
684  * @return negative error code or
685  * 0 if no new packet was allocated
686  * non-zero if a new packet was allocated and ppkt has to be freed
687  * CONTAINS_PAL if in addition to a new packet the old contained a palette
688  */
689 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
690 
691 /**
692  * Retrieves the palette from a packet, either from side data, or
693  * appended to the video data in the packet itself (raw video only).
694  * It is commonly used after a call to ff_reshuffle_raw_rgb().
695  *
696  * Use 0 for the ret parameter to check for side data only.
697  *
698  * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
699  * @param ret return value from ff_reshuffle_raw_rgb(), or 0
700  * @param palette pointer to palette buffer
701  * @return negative error code or
702  * 1 if the packet has a palette, else 0
703  */
704 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
705 
706 /**
707  * Finalize buf into extradata and set its size appropriately.
708  */
709 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
710 
711 /**
712  * Find the next packet in the interleaving queue for the given stream.
713  * The pkt parameter is filled in with the queued packet, including
714  * references to the data (which the caller is not allowed to keep or
715  * modify).
716  *
717  * @return 0 if a packet was found, a negative value if no packet was found
718  */
719 int ff_interleaved_peek(AVFormatContext *s, int stream,
720  AVPacket *pkt, int add_offset);
721 
722 
723 int ff_lock_avformat(void);
724 int ff_unlock_avformat(void);
725 
726 /**
727  * Set AVFormatContext url field to the provided pointer. The pointer must
728  * point to a valid string. The existing url field is freed if necessary. Also
729  * set the legacy filename field to the same string which was provided in url.
730  */
731 void ff_format_set_url(AVFormatContext *s, char *url);
732 
733 #define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) /**< Create a new reference for the packet instead of
734  transferring the ownership of the existing one to the
735  list. */
736 
737 /**
738  * Append an AVPacket to the list.
739  *
740  * @param head List head element
741  * @param tail List tail element
742  * @param pkt The packet being appended. The data described in it will
743  * be made reference counted if it isn't already.
744  * @param flags Any combination of FF_PACKETLIST_FLAG_* flags
745  * @return 0 on success, negative AVERROR value on failure. On failure,
746  the list is unchanged
747  */
748 int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
749  AVPacket *pkt, int flags);
750 
751 /**
752  * Remove the oldest AVPacket in the list and return it.
753  * The behaviour is undefined if the packet list is empty.
754  *
755  * @note The pkt will be overwritten completely. The caller owns the
756  * packet and must unref it by itself.
757  *
758  * @param head List head element
759  * @param tail List tail element
760  * @param pkt Pointer to an AVPacket struct
761  * @return 0 on success. Success is guaranteed
762  * if the packet list is not empty.
763  */
764 int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
765  AVPacket *pkt);
766 
767 /**
768  * Wipe the list and unref all the packets in it.
769  *
770  * @param head List head element
771  * @param tail List tail element
772  */
773 void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);
774 
775 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
776 
777 #endif /* AVFORMAT_INTERNAL_H */
int ff_framehash_write_header(AVFormatContext *s)
Set the timebase for each stream from the corresponding codec timebase and print it.
Definition: framehash.c:23
static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
Definition: vf_find_rect.c:104
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:139
AVBSFContext * bsfc
bitstream filter to run on stream
Definition: internal.h:159
Bytestream IO Context.
Definition: avio.h:161
int ff_interleaved_peek(AVFormatContext *s, int stream, AVPacket *pkt, int add_offset)
Find the next packet in the interleaving queue for the given stream.
Definition: mux.c:1032
enum AVCodecID id
Definition: internal.h:43
int size
struct AVPacketList * raw_packet_buffer
Raw packets from the demuxer, prior to parsing and decoding.
Definition: internal.h:88
int ff_rename(const char *url_src, const char *url_dst, void *logctx)
Wrap avpriv_io_move and log if error happens.
Definition: avio.c:673
int bitstream_checked
Whether or not check_bitstream should still be run on each packet.
Definition: internal.h:164
FFFrac * priv_pts
Definition: internal.h:193
static void flush(AVCodecContext *avctx)
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail, AVPacket *pkt, int flags)
Append an AVPacket to the list.
Definition: utils.c:444
struct AVPacketList * parse_queue_end
Definition: internal.h:94
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3165
static int extract_extradata(AVStream *st, const AVPacket *pkt)
Definition: utils.c:3550
int reorder
Set to 1 if the codec allows reordering, so pts can be different from dts.
Definition: internal.h:152
void avpriv_set_pts_info(AVStream *s, 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:4948
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:159
int64_t data_offset
offset of the first packet
Definition: internal.h:80
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:1305
int ff_mkdir_p(const char *path)
Automatically create sub-directories.
Definition: utils.c:4865
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:31
The bitstream filter state.
Definition: bsf.h:49
int prefer_codec_framerate
Definition: internal.h:144
int64_t offset
Offset to remap timestamps to be non-negative.
Definition: internal.h:106
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3155
const char * key
int avoid_negative_ts_use_pts
Definition: internal.h:119
static AVPacket pkt
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: utils.c:2061
int ff_is_http_proto(char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:5702
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4654
Format I/O context.
Definition: avformat.h:1351
void ff_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: utils.c:1966
void ff_read_frame_flush(AVFormatContext *s)
Flush the frame reader.
Definition: utils.c:1931
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: utils.c:1980
uint8_t
miscellaneous OS support macros and functions.
Query whether the feature is possible on this stream.
Definition: internal.h:620
The exact value of the fractional number is: &#39;val + num / den&#39;.
Definition: internal.h:59
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5695
const char data[16]
Definition: mxf.c:91
void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
Return the frame duration in seconds.
Definition: utils.c:954
#define height
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
Interleave an AVPacket per dts so it can be muxed.
Definition: mux.c:914
int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options)
Utility function to open IO stream of output format.
Definition: utils.c:5685
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
Definition: utils.c:2104
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
Copy encoding parameters from source to destination stream.
Definition: utils.c:4337
struct AVPacketList * packet_buffer
This buffer is only needed when packets were already buffered but not decoded, for example to get the...
Definition: internal.h:76
channels
Definition: aptx.h:33
int raw_packet_buffer_remaining_size
Definition: internal.h:99
void ff_rfps_calculate(AVFormatContext *ic)
Definition: utils.c:3422
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:4712
#define src
Definition: vp8dsp.c:254
int avctx_inited
1 if avctx has been initialized with the values from the codec parameters
Definition: internal.h:173
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:5707
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
unsigned int pos
Definition: spdifenc.c:412
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:5080
int ff_is_intra_only(enum AVCodecID id)
Definition: utils.c:1017
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5724
int64_t val
Definition: internal.h:60
AVPacket * pkt
Definition: internal.h:182
void avpriv_register_devices(const AVOutputFormat *const o[], const AVInputFormat *const i[])
Definition: allformats.c:643
static float distance(float x, float y, int band)
int streams_initialized
Whether or not avformat_init_output fully initialized streams.
Definition: internal.h:134
int ff_generate_avci_extradata(AVStream *st)
Generate standard extradata for AVC-Intra based on width/height and field order.
Definition: utils.c:5373
const char * name
Definition: qsvenc.c:46
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:5032
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:3328
int64_t shortest_end
Timestamp of the end of the shortest stream.
Definition: internal.h:124
void ff_free_stream(AVFormatContext *s, AVStream *st)
Definition: utils.c:4447
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:355
#define width
int ff_unlock_avformat(void)
Definition: utils.c:83
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:5733
int32_t
#define s(width, name)
Definition: cbs_vp9.c:257
void ff_format_set_url(AVFormatContext *s, char *url)
Set AVFormatContext url field to the provided pointer.
Definition: utils.c:5855
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:828
Stream structure.
Definition: avformat.h:876
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:4717
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts)
add frame for rfps calculation.
Definition: utils.c:3362
sample_rate
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: utils.c:1993
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:104
typedef void(RENAME(mix_any_func_type))
main external API structure.
Definition: avcodec.h:526
static av_always_inline void RENAME() interleave(TYPE *dst, TYPE *src0, TYPE *src1, int w2, int add, int shift)
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:803
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:89
int nb_interleaved_streams
Number of streams relevant for interleaving.
Definition: internal.h:69
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: utils.c:2290
int initialized
Whether or not avformat_init_output has already been called.
Definition: internal.h:129
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:3177
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf)
Finalize buf into extradata and set its size appropriately.
Definition: utils.c:5758
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar) ...
Definition: internal.h:189
void ff_packet_list_free(AVPacketList **head, AVPacketList **tail)
Wipe the list and unref all the packets in it.
Definition: utils.c:1429
int inject_global_side_data
Definition: internal.h:117
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:4920
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: utils.c:2252
#define flags(name, subs,...)
Definition: cbs_av1.c:565
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:4978
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:105
unsigned int tag
Definition: internal.h:44
struct AVPacketList * parse_queue
Packets split by the parser get queued here.
Definition: internal.h:93
AVRational offset_timebase
Timebase for the timestamp offset.
Definition: internal.h:111
int ff_packet_list_get(AVPacketList **head, AVPacketList **tail, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: utils.c:1560
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3388
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:850
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:3346
unsigned bps
Definition: movenc.c:1533
AVWriteUncodedFrameFlags
Flags for AVFormatContext.write_uncoded_frame()
Definition: internal.h:614
struct AVPacketList * packet_buffer_end
Definition: internal.h:77
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
Add a bitstream filter to a stream.
Definition: utils.c:5579
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
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting its contents.
Definition: aviobuf.c:842
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:169
int ff_lock_avformat(void)
Definition: utils.c:78
FILE * out
Definition: movenc.c:54
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:554
int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
Read a whole line of text from AVIOContext to an AVBPrint buffer.
Definition: aviobuf.c:811
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:786
AVBSFContext * bsf
Definition: internal.h:181
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4899
This structure stores compressed data.
Definition: packet.h:332
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt, int(*compare)(AVFormatContext *, const AVPacket *, const AVPacket *))
Add packet to an AVFormatContext&#39;s packet_buffer list, determining its interleaved position using com...
Definition: mux.c:812
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: utils.c:2184
struct AVPacketList * raw_packet_buffer_end
Definition: internal.h:89