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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 #define MAX_PROBE_PACKETS 2500
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 typedef struct AVCodecTag {
45  enum AVCodecID id;
46  unsigned int tag;
47 } AVCodecTag;
48 
49 typedef struct CodecMime{
50  char str[32];
51  enum AVCodecID id;
52 } CodecMime;
53 
54 /*************************************************/
55 /* fractional numbers for exact pts handling */
56 
57 /**
58  * The exact value of the fractional number is: 'val + num / den'.
59  * num is assumed to be 0 <= num < den.
60  */
61 typedef struct FFFrac {
62  int64_t val, num, den;
63 } FFFrac;
64 
65 
67  /**
68  * Number of streams relevant for interleaving.
69  * Muxing only.
70  */
72 
73  /**
74  * This buffer is only needed when packets were already buffered but
75  * not decoded, for example to get the codec parameters in MPEG
76  * streams.
77  */
80 
81  /* av_seek_frame() support */
82  int64_t data_offset; /**< offset of the first packet */
83 
84  /**
85  * Raw packets from the demuxer, prior to parsing and decoding.
86  * This buffer is used for buffering packets until the codec can
87  * be identified, as parsing cannot be done without knowing the
88  * codec.
89  */
92  /**
93  * Packets split by the parser get queued here.
94  */
97  /**
98  * Remaining size available for raw_packet_buffer, in bytes.
99  */
100 #define RAW_PACKET_BUFFER_SIZE 2500000
102 
103  /**
104  * Offset to remap timestamps to be non-negative.
105  * Expressed in timebase units.
106  * @see AVStream.mux_ts_offset
107  */
108  int64_t offset;
109 
110  /**
111  * Timebase for the timestamp offset.
112  */
114 
115 #if FF_API_COMPUTE_PKT_FIELDS2
116  int missing_ts_warning;
117 #endif
118 
120 
122 
123  /**
124  * Timestamp of the end of the shortest stream.
125  */
126  int64_t shortest_end;
127 
128  /**
129  * Whether or not avformat_init_output has already been called
130  */
132 
133  /**
134  * Whether or not avformat_init_output fully initialized streams
135  */
137 
138  /**
139  * ID3v2 tag useful for MP3 demuxing
140  */
142 
143  /*
144  * Prefer the codec framerate for avg_frame_rate computation.
145  */
147 };
148 
150  /**
151  * Set to 1 if the codec allows reordering, so pts can be different
152  * from dts.
153  */
154  int reorder;
155 
156  /**
157  * bitstream filters to run on stream
158  * - encoding: Set by muxer using ff_stream_add_bitstream_filter
159  * - decoding: unused
160  */
162  int nb_bsfcs;
163 
164  /**
165  * Whether or not check_bitstream should still be run on each packet
166  */
168 
169  /**
170  * The codec context used by avformat_find_stream_info, the parser, etc.
171  */
173  /**
174  * 1 if avctx has been initialized with the values from the codec parameters
175  */
177 
179 
180  /* the context for extracting extradata in find_stream_info()
181  * inited=1/bsf=NULL signals that extracting is not possible (codec not
182  * supported) */
183  struct {
186  int inited;
188 
189  /**
190  * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
191  */
193 
195 };
196 
197 #ifdef __GNUC__
198 #define dynarray_add(tab, nb_ptr, elem)\
199 do {\
200  __typeof__(tab) _tab = (tab);\
201  __typeof__(elem) _elem = (elem);\
202  (void)sizeof(**_tab == _elem); /* check that types are compatible */\
203  av_dynarray_add(_tab, nb_ptr, _elem);\
204 } while(0)
205 #else
206 #define dynarray_add(tab, nb_ptr, elem)\
207 do {\
208  av_dynarray_add((tab), nb_ptr, (elem));\
209 } while(0)
210 #endif
211 
212 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
213 
214 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
215 
216 /**
217  * Parse a string of hexadecimal strings. Any space between the hexadecimal
218  * digits is ignored.
219  *
220  * @param data if non-null, the parsed data is written to this pointer
221  * @param p the string to parse
222  * @return the number of bytes written (or to be written, if data is null)
223  */
224 int ff_hex_to_data(uint8_t *data, const char *p);
225 
226 /**
227  * Add packet to AVFormatContext->packet_buffer list, determining its
228  * interleaved position using compare() function argument.
229  * @return 0, or < 0 on error
230  */
232  int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
233 
235 
236 #define NTP_OFFSET 2208988800ULL
237 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
238 
239 /** Get the current time since NTP epoch in microseconds. */
240 uint64_t ff_ntp_time(void);
241 
242 /**
243  * Append the media-specific SDP fragment for the media stream c
244  * to the buffer buff.
245  *
246  * Note, the buffer needs to be initialized, since it is appended to
247  * existing content.
248  *
249  * @param buff the buffer to append the SDP fragment to
250  * @param size the size of the buff buffer
251  * @param st the AVStream of the media to describe
252  * @param idx the global stream index
253  * @param dest_addr the destination address of the media stream, may be NULL
254  * @param dest_type the destination address type, may be NULL
255  * @param port the destination port of the media stream, 0 if unknown
256  * @param ttl the time to live of the stream, 0 if not multicast
257  * @param fmt the AVFormatContext, which might contain options modifying
258  * the generated SDP
259  */
260 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
261  const char *dest_addr, const char *dest_type,
262  int port, int ttl, AVFormatContext *fmt);
263 
264 /**
265  * Write a packet to another muxer than the one the user originally
266  * intended. Useful when chaining muxers, where one muxer internally
267  * writes a received packet to another muxer.
268  *
269  * @param dst the muxer to write the packet to
270  * @param dst_stream the stream index within dst to write the packet to
271  * @param pkt the packet to be written
272  * @param src the muxer the packet originally was intended for
273  * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
274  * @return the value av_write_frame returned
275  */
276 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
278 
279 /**
280  * Get the length in bytes which is needed to store val as v.
281  */
282 int ff_get_v_length(uint64_t val);
283 
284 /**
285  * Put val using a variable number of bytes.
286  */
287 void ff_put_v(AVIOContext *bc, uint64_t val);
288 
289 /**
290  * Read a whole line of text from AVIOContext. Stop reading after reaching
291  * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
292  * and may be truncated if the buffer is too small.
293  *
294  * @param s the read-only AVIOContext
295  * @param buf buffer to store the read line
296  * @param maxlen size of the buffer
297  * @return the length of the string written in the buffer, not including the
298  * final \\0
299  */
300 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
301 
302 /**
303  * Same as ff_get_line but strip the white-space characters in the text tail
304  *
305  * @param s the read-only AVIOContext
306  * @param buf buffer to store the read line
307  * @param maxlen size of the buffer
308  * @return the length of the string written in the buffer
309  */
310 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
311 
312 /**
313  * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
314  * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
315  * ending characters are NOT included in the buffer, but they are skipped on
316  * the input.
317  *
318  * @param s the read-only AVIOContext
319  * @param bp the AVBPrint buffer
320  * @return the length of the read line, not including the line endings,
321  * negative on error.
322  */
323 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
324 
325 /**
326  * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
327  * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
328  * EOF. The line ending characters are NOT included in the buffer, but they
329  * are skipped on the input.
330  *
331  * @param s the read-only AVIOContext
332  * @param bp the AVBPrint buffer
333  * @return the length of the read line not including the line endings,
334  * negative on error, or if the buffer becomes truncated.
335  */
336 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
337 
338 #define SPACE_CHARS " \t\r\n"
339 
340 /**
341  * Callback function type for ff_parse_key_value.
342  *
343  * @param key a pointer to the key
344  * @param key_len the number of bytes that belong to the key, including the '='
345  * char
346  * @param dest return the destination pointer for the value in *dest, may
347  * be null to ignore the value
348  * @param dest_len the length of the *dest buffer
349  */
350 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
351  int key_len, char **dest, int *dest_len);
352 /**
353  * Parse a string with comma-separated key=value pairs. The value strings
354  * may be quoted and may contain escaped characters within quoted strings.
355  *
356  * @param str the string to parse
357  * @param callback_get_buf function that returns where to store the
358  * unescaped value string.
359  * @param context the opaque context pointer to pass to callback_get_buf
360  */
361 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
362  void *context);
363 
364 /**
365  * Find stream index based on format-specific stream ID
366  * @return stream index, or < 0 on error
367  */
368 int ff_find_stream_index(AVFormatContext *s, int id);
369 
370 /**
371  * Internal version of av_index_search_timestamp
372  */
373 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
374  int64_t wanted_timestamp, int flags);
375 
376 /**
377  * Internal version of av_add_index_entry
378  */
379 int ff_add_index_entry(AVIndexEntry **index_entries,
380  int *nb_index_entries,
381  unsigned int *index_entries_allocated_size,
382  int64_t pos, int64_t timestamp, int size, int distance, int flags);
383 
384 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
385 
386 /**
387  * Add a new chapter.
388  *
389  * @param s media file handle
390  * @param id unique ID for this chapter
391  * @param start chapter start time in time_base units
392  * @param end chapter end time in time_base units
393  * @param title chapter title
394  *
395  * @return AVChapter or NULL on error
396  */
398  int64_t start, int64_t end, const char *title);
399 
400 /**
401  * Ensure the index uses less memory than the maximum specified in
402  * AVFormatContext.max_index_size by discarding entries if it grows
403  * too large.
404  */
405 void ff_reduce_index(AVFormatContext *s, int stream_index);
406 
407 enum AVCodecID ff_guess_image2_codec(const char *filename);
408 
409 /**
410  * Perform a binary search using av_index_search_timestamp() and
411  * AVInputFormat.read_timestamp().
412  *
413  * @param target_ts target timestamp in the time base of the given stream
414  * @param stream_index stream number
415  */
416 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
417  int64_t target_ts, int flags);
418 
419 /**
420  * Update cur_dts of all streams based on the given timestamp and AVStream.
421  *
422  * Stream ref_st unchanged, others set cur_dts in their native time base.
423  * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
424  * @param timestamp new dts expressed in time_base of param ref_st
425  * @param ref_st reference stream giving time_base of param timestamp
426  */
427 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
428 
429 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
430  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
431 
432 /**
433  * Perform a binary search using read_timestamp().
434  *
435  * @param target_ts target timestamp in the time base of the given stream
436  * @param stream_index stream number
437  */
438 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
439  int64_t target_ts, int64_t pos_min,
440  int64_t pos_max, int64_t pos_limit,
441  int64_t ts_min, int64_t ts_max,
442  int flags, int64_t *ts_ret,
443  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
444 
445 /**
446  * Set the time base and wrapping info for a given stream. This will be used
447  * to interpret the stream's timestamps. If the new time base is invalid
448  * (numerator or denominator are non-positive), it leaves the stream
449  * unchanged.
450  *
451  * @param s stream
452  * @param pts_wrap_bits number of bits effectively used by the pts
453  * (used for wrap control)
454  * @param pts_num time base numerator
455  * @param pts_den time base denominator
456  */
457 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
458  unsigned int pts_num, unsigned int pts_den);
459 
460 /**
461  * Add side data to a packet for changing parameters to the given values.
462  * Parameters set to 0 aren't included in the change.
463  */
465  uint64_t channel_layout, int32_t sample_rate,
467 
468 /**
469  * Set the timebase for each stream from the corresponding codec timebase and
470  * print it.
471  */
473 
474 /**
475  * Read a transport packet from a media file.
476  *
477  * @param s media file handle
478  * @param pkt is filled
479  * @return 0 if OK, AVERROR_xxx on error
480  */
482 
483 /**
484  * Interleave a packet per dts in an output media file.
485  *
486  * Packets with pkt->destruct == av_destruct_packet will be freed inside this
487  * function, so they cannot be used after it. Note that calling av_packet_unref()
488  * on them is still safe.
489  *
490  * @param s media file handle
491  * @param out the interleaved packet will be output here
492  * @param pkt the input packet
493  * @param flush 1 if no further packets are available as input and all
494  * remaining packets should be output
495  * @return 1 if a packet was output, 0 if no packet could be output,
496  * < 0 if an error occurred
497  */
499  AVPacket *pkt, int flush);
500 
502 
503 /**
504  * Return the frame duration in seconds. Return 0 if not available.
505  */
506 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
507  AVCodecParserContext *pc, AVPacket *pkt);
508 
509 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
510 
511 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
512 
513 /**
514  * Select a PCM codec based on the given parameters.
515  *
516  * @param bps bits-per-sample
517  * @param flt floating-point
518  * @param be big-endian
519  * @param sflags signed flags. each bit corresponds to one byte of bit depth.
520  * e.g. the 1st bit indicates if 8-bit should be signed or
521  * unsigned, the 2nd bit indicates if 16-bit should be signed or
522  * unsigned, etc... This is useful for formats such as WAVE where
523  * only 8-bit is unsigned and all other bit depths are signed.
524  * @return a PCM codec id or AV_CODEC_ID_NONE
525  */
526 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
527 
528 /**
529  * Chooses a timebase for muxing the specified stream.
530  *
531  * The chosen timebase allows sample accurate timestamps based
532  * on the framerate or sample rate for audio streams. It also is
533  * at least as precise as 1/min_precision would be.
534  */
535 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
536 
537 /**
538  * Chooses a timebase for muxing the specified stream.
539  */
541 
542 /**
543  * Generate standard extradata for AVC-Intra based on width/height and field
544  * order.
545  */
547 
548 /**
549  * Add a bitstream filter to a stream.
550  *
551  * @param st output stream to add a filter to
552  * @param name the name of the filter to add
553  * @param args filter-specific argument string
554  * @return >0 on success;
555  * AVERROR code on failure
556  */
557 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
558 
559 /**
560  * Copy encoding parameters from source to destination stream
561  *
562  * @param dst pointer to destination AVStream
563  * @param src pointer to source AVStream
564  * @return >=0 on success, AVERROR code on error
565  */
567 
568 /**
569  * Wrap errno on rename() error.
570  *
571  * @param oldpath source path
572  * @param newpath destination path
573  * @return 0 or AVERROR on failure
574  */
575 static inline int ff_rename(const char *oldpath, const char *newpath, void *logctx)
576 {
577  int ret = 0;
578  if (rename(oldpath, newpath) == -1) {
579  ret = AVERROR(errno);
580  if (logctx) {
581  char err[AV_ERROR_MAX_STRING_SIZE] = {0};
583  av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", oldpath, newpath, err);
584  }
585  }
586  return ret;
587 }
588 
589 /**
590  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
591  * which is always set to 0.
592  *
593  * Previously allocated extradata in par will be freed.
594  *
595  * @param size size of extradata
596  * @return 0 if OK, AVERROR_xxx on error
597  */
599 
600 /**
601  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
602  * which is always set to 0 and fill it from pb.
603  *
604  * @param size size of extradata
605  * @return >= 0 if OK, AVERROR_xxx on error
606  */
608 
609 /**
610  * add frame for rfps calculation.
611  *
612  * @param dts timestamp of the i-th frame
613  * @return 0 if OK, AVERROR_xxx on error
614  */
615 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
616 
618 
619 /**
620  * Flags for AVFormatContext.write_uncoded_frame()
621  */
623 
624  /**
625  * Query whether the feature is possible on this stream.
626  * The frame argument is ignored.
627  */
629 
630 };
631 
632 /**
633  * Copies the whilelists from one context to the other
634  */
636 
637 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
639 
640 /**
641  * Returned by demuxers to indicate that data was consumed but discarded
642  * (ignored streams or junk data). The framework will re-call the demuxer.
643  */
644 #define FFERROR_REDO FFERRTAG('R','E','D','O')
645 
646 /**
647  * Utility function to open IO stream of output format.
648  *
649  * @param s AVFormatContext
650  * @param url URL or file name to open for writing
651  * @options optional options which will be passed to io_open callback
652  * @return >=0 on success, negative AVERROR in case of failure
653  */
654 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
655 
656 /*
657  * A wrapper around AVFormatContext.io_close that should be used
658  * instead of calling the pointer directly.
659  */
661 
662 /**
663  * Utility function to check if the file uses http or https protocol
664  *
665  * @param s AVFormatContext
666  * @param filename URL or file name to open for writing
667  */
668 int ff_is_http_proto(char *filename);
669 
670 /**
671  * Parse creation_time in AVFormatContext metadata if exists and warn if the
672  * parsing fails.
673  *
674  * @param s AVFormatContext
675  * @param timestamp parsed timestamp in microseconds, only set on successful parsing
676  * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
677  * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
678  */
679 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
680 
681 /**
682  * Standardize creation_time metadata in AVFormatContext to an ISO-8601
683  * timestamp string.
684  *
685  * @param s AVFormatContext
686  * @return <0 on error
687  */
689 
690 #define CONTAINS_PAL 2
691 /**
692  * Reshuffles the lines to use the user specified stride.
693  *
694  * @param ppkt input and output packet
695  * @return negative error code or
696  * 0 if no new packet was allocated
697  * non-zero if a new packet was allocated and ppkt has to be freed
698  * CONTAINS_PAL if in addition to a new packet the old contained a palette
699  */
700 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
701 
702 /**
703  * Retrieves the palette from a packet, either from side data, or
704  * appended to the video data in the packet itself (raw video only).
705  * It is commonly used after a call to ff_reshuffle_raw_rgb().
706  *
707  * Use 0 for the ret parameter to check for side data only.
708  *
709  * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
710  * @param ret return value from ff_reshuffle_raw_rgb(), or 0
711  * @param palette pointer to palette buffer
712  * @return negative error code or
713  * 1 if the packet has a palette, else 0
714  */
715 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
716 
717 /**
718  * Finalize buf into extradata and set its size appropriately.
719  */
720 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
721 
722 /**
723  * Find the next packet in the interleaving queue for the given stream.
724  * The pkt parameter is filled in with the queued packet, including
725  * references to the data (which the caller is not allowed to keep or
726  * modify).
727  *
728  * @return 0 if a packet was found, a negative value if no packet was found
729  */
730 int ff_interleaved_peek(AVFormatContext *s, int stream,
731  AVPacket *pkt, int add_offset);
732 
733 
734 int ff_lock_avformat(void);
735 int ff_unlock_avformat(void);
736 
737 /**
738  * Set AVFormatContext url field to the provided pointer. The pointer must
739  * point to a valid string. The existing url field is freed if necessary. Also
740  * set the legacy filename field to the same string which was provided in url.
741  */
742 void ff_format_set_url(AVFormatContext *s, char *url);
743 
744 #define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) /**< Create a new reference for the packet instead of
745  transferring the ownership of the existing one to the
746  list. */
747 
748 /**
749  * Append an AVPacket to the list.
750  *
751  * @param head List head element
752  * @param tail List tail element
753  * @param pkt The packet being appended
754  * @param flags Any combination of FF_PACKETLIST_FLAG_* flags
755  * @return 0 on success, negative AVERROR value on failure. On failure,
756  the list is unchanged
757  */
758 int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
759  AVPacket *pkt, int flags);
760 
761 /**
762  * Remove the oldest AVPacket in the list and return it.
763  *
764  * @note The pkt will be overwritten completely. The caller owns the
765  * packet and must unref it by itself.
766  *
767  * @param head List head element
768  * @param tail List tail element
769  * @param pkt Pointer to an initialized AVPacket struct
770  */
771 int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
772  AVPacket *pkt);
773 
774 /**
775  * Wipe the list and unref all the packets in it.
776  *
777  * @param head List head element
778  * @param tail List tail element
779  */
780 void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);
781 
782 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
783 
784 #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:105
void ff_put_v(AVIOContext *bc, uint64_t val)
Put val using a variable number of bytes.
Definition: aviobuf.c:447
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:141
const char const char void * val
Definition: avisynth_c.h:771
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:1139
enum AVCodecID id
Definition: internal.h:45
struct AVPacketList * raw_packet_buffer
Raw packets from the demuxer, prior to parsing and decoding.
Definition: internal.h:90
int bitstream_checked
Whether or not check_bitstream should still be run on each packet.
Definition: internal.h:167
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
FFFrac * priv_pts
Definition: internal.h:194
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:350
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:447
struct AVPacketList * parse_queue_end
Definition: internal.h:96
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3123
const char * fmt
Definition: avisynth_c.h:769
int reorder
Set to 1 if the codec allows reordering, so pts can be different from dts.
Definition: internal.h:154
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:4827
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:164
int64_t data_offset
offset of the first packet
Definition: internal.h:82
channels
Definition: aptx.c:30
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:1311
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:31
The bitstream filter state.
Definition: avcodec.h:5687
int prefer_codec_framerate
Definition: internal.h:146
int64_t offset
Offset to remap timestamps to be non-negative.
Definition: internal.h:108
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3113
const char * key
int avoid_negative_ts_use_pts
Definition: internal.h:121
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:2047
int ff_is_http_proto(char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:5622
#define src
Definition: vp8dsp.c:254
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
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:4584
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:1952
char str[32]
Definition: internal.h:50
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:1917
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:1966
uint8_t
int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Definition: aviobuf.c:1184
miscellaneous OS support macros and functions.
Query whether the feature is possible on this stream.
Definition: internal.h:628
The exact value of the fractional number is: 'val + num / den'.
Definition: internal.h:61
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5615
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:948
#define height
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
Interleave a packet per dts in an output media file.
Definition: mux.c:1020
int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options)
Utility function to open IO stream of output format.
Definition: utils.c:5605
uint32_t tag
Definition: movenc.c:1455
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
Definition: utils.c:2090
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
Copy encoding parameters from source to destination stream.
Definition: utils.c:4269
enum AVCodecID id
Definition: internal.h:51
ptrdiff_t size
Definition: opengl_enc.c:101
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:78
#define flags(name, subs,...)
Definition: cbs_h2645.c:263
int raw_packet_buffer_remaining_size
Definition: internal.h:101
#define av_log(a,...)
void ff_rfps_calculate(AVFormatContext *ic)
Definition: utils.c:3378
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:4642
Callback for checking whether to abort blocking functions.
Definition: avio.h:58
int avctx_inited
1 if avctx has been initialized with the values from the codec parameters
Definition: internal.h:176
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:5627
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:481
#define AVERROR(e)
Definition: error.h:43
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt, int(*compare)(AVFormatContext *, AVPacket *, AVPacket *))
Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare...
Definition: mux.c:919
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:4959
uint16_t width
Definition: gdv.c:47
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5644
int64_t val
Definition: internal.h:62
AVPacket * pkt
Definition: internal.h:185
void avpriv_register_devices(const AVOutputFormat *const o[], const AVInputFormat *const i[])
Definition: allformats.c:612
static float distance(float x, float y, int band)
int streams_initialized
Whether or not avformat_init_output fully initialized streams.
Definition: internal.h:136
int ff_generate_avci_extradata(AVStream *st)
Generate standard extradata for AVC-Intra based on width/height and field order.
Definition: utils.c:5285
AVBSFContext ** bsfcs
bitstream filters to run on stream
Definition: internal.h:161
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:4911
static char * av_make_error_string(char *errbuf, size_t errbuf_size, int errnum)
Fill the provided buffer with a string containing an error string corresponding to the AVERROR code e...
Definition: error.h:109
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:3286
int64_t shortest_end
Timestamp of the end of the shortest stream.
Definition: internal.h:126
void ff_free_stream(AVFormatContext *s, AVStream *st)
Definition: utils.c:4382
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int ff_unlock_avformat(void)
Definition: utils.c:88
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:5653
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:5775
struct AVStreamInternal::@231 extract_extradata
int64_t num
Definition: internal.h:62
#define AV_ERROR_MAX_STRING_SIZE
Definition: error.h:83
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:831
Stream structure.
Definition: avformat.h:874
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts)
add frame for rfps calculation.
Definition: utils.c:3320
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:1979
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:102
int64_t den
Definition: internal.h:62
main external API structure.
Definition: avcodec.h:1518
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:826
void * buf
Definition: avisynth_c.h:690
static int ff_rename(const char *oldpath, const char *newpath, void *logctx)
Wrap errno on rename() error.
Definition: internal.h:575
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:102
int nb_interleaved_streams
Number of streams relevant for interleaving.
Definition: internal.h:71
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:2268
int initialized
Whether or not avformat_init_output has already been called.
Definition: internal.h:131
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:3135
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:5678
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar) ...
Definition: internal.h:192
void ff_packet_list_free(AVPacketList **head, AVPacketList **tail)
Wipe the list and unref all the packets in it.
Definition: utils.c:1418
int inject_global_side_data
Definition: internal.h:119
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:4799
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:2230
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:4857
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st)
Chooses a timebase for muxing the specified stream.
Definition: mux.c:118
unsigned int tag
Definition: internal.h:46
struct AVPacketList * parse_queue
Packets split by the parser get queued here.
Definition: internal.h:95
AVRational offset_timebase
Timebase for the timestamp offset.
Definition: internal.h:113
int ff_get_v_length(uint64_t val)
Get the length in bytes which is needed to store val as v.
Definition: aviobuf.c:437
int ff_packet_list_get(AVPacketList **head, AVPacketList **tail, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: utils.c:1549
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3294
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:846
enum AVCodecID orig_codec_id
Definition: internal.h:178
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:3304
unsigned bps
Definition: movenc.c:1456
AVWriteUncodedFrameFlags
Flags for AVFormatContext.write_uncoded_frame()
Definition: internal.h:622
struct AVPacketList * packet_buffer_end
Definition: internal.h:79
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args)
Add a bitstream filter to a stream.
Definition: utils.c:5490
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:865
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:172
int ff_lock_avformat(void)
Definition: utils.c:83
FILE * out
Definition: movenc.c:54
void INT64 start
Definition: avisynth_c.h:690
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:522
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:834
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:809
AVBSFContext * bsf
Definition: internal.h:184
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4778
This structure stores compressed data.
Definition: avcodec.h:1407
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:2162
struct AVPacketList * raw_packet_buffer_end
Definition: internal.h:91
const char * name
Definition: opengl_enc.c:103