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 "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
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
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
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:441
struct AVPacketList * parse_queue_end
Definition: internal.h:94
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3158
static int extract_extradata(AVStream *st, const AVPacket *pkt)
Definition: utils.c:3543
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:4938
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:4855
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:3148
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:2054
int ff_is_http_proto(char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:5692
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:4647
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:1959
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:117
void ff_read_frame_flush(AVFormatContext *s)
Flush the frame reader.
Definition: utils.c:1924
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:1973
uint8_t
miscellaneous OS support macros and functions.
Query whether the feature is possible on this stream.
Definition: internal.h:620
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
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:90
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5685
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:951
#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:5675
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
Definition: utils.c:2097
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
Copy encoding parameters from source to destination stream.
Definition: utils.c:4330
ptrdiff_t size
Definition: opengl_enc.c:100
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:3415
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:4705
#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:5697
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
unsigned int pos
Definition: spdifenc.c:410
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:5070
int ff_is_intra_only(enum AVCodecID id)
Definition: utils.c:1014
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5714
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:645
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:5363
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:5022
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:3321
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:4440
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
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
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:5723
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:5845
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:825
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:4710
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts)
add frame for rfps calculation.
Definition: utils.c:3355
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:1986
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:104
main external API structure.
Definition: avcodec.h:526
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
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:815
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:2283
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:3170
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:5748
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:1423
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:4910
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:2245
#define flags(name, subs,...)
Definition: cbs_av1.c:560
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:4968
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:1553
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3391
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:847
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:3339
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:5569
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:854
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:557
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:823
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:798
AVBSFContext * bsf
Definition: internal.h:181
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 local context
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4889
This structure stores compressed data.
Definition: packet.h:332
int i
Definition: input.c:406
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:2177
struct AVPacketList * raw_packet_buffer_end
Definition: internal.h:89
const char * name
Definition: opengl_enc.c:102