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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 /**
215  * Automatically create sub-directories
216  *
217  * @param path will create sub-directories by path
218  * @return 0, or < 0 on error
219  */
220 int ff_mkdir_p(const char *path);
221 
222 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
223 
224 /**
225  * Parse a string of hexadecimal strings. Any space between the hexadecimal
226  * digits is ignored.
227  *
228  * @param data if non-null, the parsed data is written to this pointer
229  * @param p the string to parse
230  * @return the number of bytes written (or to be written, if data is null)
231  */
232 int ff_hex_to_data(uint8_t *data, const char *p);
233 
234 /**
235  * Add packet to AVFormatContext->packet_buffer list, determining its
236  * interleaved position using compare() function argument.
237  * @return 0, or < 0 on error
238  */
240  int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
241 
243 
244 #define NTP_OFFSET 2208988800ULL
245 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
246 
247 /** Get the current time since NTP epoch in microseconds. */
248 uint64_t ff_ntp_time(void);
249 
250 /**
251  * Get the NTP time stamp formatted as per the RFC-5905.
252  *
253  * @param ntp_time NTP time in micro seconds (since NTP epoch)
254  * @return the formatted NTP time stamp
255  */
256 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
257 
258 /**
259  * Append the media-specific SDP fragment for the media stream c
260  * to the buffer buff.
261  *
262  * Note, the buffer needs to be initialized, since it is appended to
263  * existing content.
264  *
265  * @param buff the buffer to append the SDP fragment to
266  * @param size the size of the buff buffer
267  * @param st the AVStream of the media to describe
268  * @param idx the global stream index
269  * @param dest_addr the destination address of the media stream, may be NULL
270  * @param dest_type the destination address type, may be NULL
271  * @param port the destination port of the media stream, 0 if unknown
272  * @param ttl the time to live of the stream, 0 if not multicast
273  * @param fmt the AVFormatContext, which might contain options modifying
274  * the generated SDP
275  */
276 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
277  const char *dest_addr, const char *dest_type,
278  int port, int ttl, AVFormatContext *fmt);
279 
280 /**
281  * Write a packet to another muxer than the one the user originally
282  * intended. Useful when chaining muxers, where one muxer internally
283  * writes a received packet to another muxer.
284  *
285  * @param dst the muxer to write the packet to
286  * @param dst_stream the stream index within dst to write the packet to
287  * @param pkt the packet to be written
288  * @param src the muxer the packet originally was intended for
289  * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
290  * @return the value av_write_frame returned
291  */
292 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
294 
295 /**
296  * Get the length in bytes which is needed to store val as v.
297  */
298 int ff_get_v_length(uint64_t val);
299 
300 /**
301  * Put val using a variable number of bytes.
302  */
303 void ff_put_v(AVIOContext *bc, uint64_t val);
304 
305 /**
306  * Read a whole line of text from AVIOContext. Stop reading after reaching
307  * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
308  * and may be truncated if the buffer is too small.
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, not including the
314  * final \\0
315  */
316 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
317 
318 /**
319  * Same as ff_get_line but strip the white-space characters in the text tail
320  *
321  * @param s the read-only AVIOContext
322  * @param buf buffer to store the read line
323  * @param maxlen size of the buffer
324  * @return the length of the string written in the buffer
325  */
326 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
327 
328 /**
329  * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
330  * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
331  * ending characters are NOT included in the buffer, but they are skipped on
332  * the input.
333  *
334  * @param s the read-only AVIOContext
335  * @param bp the AVBPrint buffer
336  * @return the length of the read line, not including the line endings,
337  * negative on error.
338  */
339 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
340 
341 /**
342  * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
343  * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
344  * EOF. The line ending characters are NOT included in the buffer, but they
345  * are skipped on the input.
346  *
347  * @param s the read-only AVIOContext
348  * @param bp the AVBPrint buffer
349  * @return the length of the read line not including the line endings,
350  * negative on error, or if the buffer becomes truncated.
351  */
352 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
353 
354 #define SPACE_CHARS " \t\r\n"
355 
356 /**
357  * Callback function type for ff_parse_key_value.
358  *
359  * @param key a pointer to the key
360  * @param key_len the number of bytes that belong to the key, including the '='
361  * char
362  * @param dest return the destination pointer for the value in *dest, may
363  * be null to ignore the value
364  * @param dest_len the length of the *dest buffer
365  */
366 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
367  int key_len, char **dest, int *dest_len);
368 /**
369  * Parse a string with comma-separated key=value pairs. The value strings
370  * may be quoted and may contain escaped characters within quoted strings.
371  *
372  * @param str the string to parse
373  * @param callback_get_buf function that returns where to store the
374  * unescaped value string.
375  * @param context the opaque context pointer to pass to callback_get_buf
376  */
377 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
378  void *context);
379 
380 /**
381  * Find stream index based on format-specific stream ID
382  * @return stream index, or < 0 on error
383  */
384 int ff_find_stream_index(AVFormatContext *s, int id);
385 
386 /**
387  * Internal version of av_index_search_timestamp
388  */
389 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
390  int64_t wanted_timestamp, int flags);
391 
392 /**
393  * Internal version of av_add_index_entry
394  */
395 int ff_add_index_entry(AVIndexEntry **index_entries,
396  int *nb_index_entries,
397  unsigned int *index_entries_allocated_size,
398  int64_t pos, int64_t timestamp, int size, int distance, int flags);
399 
400 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
401 
402 /**
403  * Add a new chapter.
404  *
405  * @param s media file handle
406  * @param id unique ID for this chapter
407  * @param start chapter start time in time_base units
408  * @param end chapter end time in time_base units
409  * @param title chapter title
410  *
411  * @return AVChapter or NULL on error
412  */
414  int64_t start, int64_t end, const char *title);
415 
416 /**
417  * Ensure the index uses less memory than the maximum specified in
418  * AVFormatContext.max_index_size by discarding entries if it grows
419  * too large.
420  */
421 void ff_reduce_index(AVFormatContext *s, int stream_index);
422 
423 enum AVCodecID ff_guess_image2_codec(const char *filename);
424 
425 /**
426  * Perform a binary search using av_index_search_timestamp() and
427  * AVInputFormat.read_timestamp().
428  *
429  * @param target_ts target timestamp in the time base of the given stream
430  * @param stream_index stream number
431  */
432 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
433  int64_t target_ts, int flags);
434 
435 /**
436  * Update cur_dts of all streams based on the given timestamp and AVStream.
437  *
438  * Stream ref_st unchanged, others set cur_dts in their native time base.
439  * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
440  * @param timestamp new dts expressed in time_base of param ref_st
441  * @param ref_st reference stream giving time_base of param timestamp
442  */
443 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
444 
445 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
446  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
447 
448 /**
449  * Perform a binary search using read_timestamp().
450  *
451  * @param target_ts target timestamp in the time base of the given stream
452  * @param stream_index stream number
453  */
454 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
455  int64_t target_ts, int64_t pos_min,
456  int64_t pos_max, int64_t pos_limit,
457  int64_t ts_min, int64_t ts_max,
458  int flags, int64_t *ts_ret,
459  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
460 
461 /**
462  * Set the time base and wrapping info for a given stream. This will be used
463  * to interpret the stream's timestamps. If the new time base is invalid
464  * (numerator or denominator are non-positive), it leaves the stream
465  * unchanged.
466  *
467  * @param s stream
468  * @param pts_wrap_bits number of bits effectively used by the pts
469  * (used for wrap control)
470  * @param pts_num time base numerator
471  * @param pts_den time base denominator
472  */
473 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
474  unsigned int pts_num, unsigned int pts_den);
475 
476 /**
477  * Add side data to a packet for changing parameters to the given values.
478  * Parameters set to 0 aren't included in the change.
479  */
481  uint64_t channel_layout, int32_t sample_rate,
483 
484 /**
485  * Set the timebase for each stream from the corresponding codec timebase and
486  * print it.
487  */
489 
490 /**
491  * Read a transport packet from a media file.
492  *
493  * @param s media file handle
494  * @param pkt is filled
495  * @return 0 if OK, AVERROR_xxx on error
496  */
498 
499 /**
500  * Interleave a packet per dts in an output media file.
501  *
502  * Packets with pkt->destruct == av_destruct_packet will be freed inside this
503  * function, so they cannot be used after it. Note that calling av_packet_unref()
504  * on them is still safe.
505  *
506  * @param s media file handle
507  * @param out the interleaved packet will be output here
508  * @param pkt the input packet
509  * @param flush 1 if no further packets are available as input and all
510  * remaining packets should be output
511  * @return 1 if a packet was output, 0 if no packet could be output,
512  * < 0 if an error occurred
513  */
515  AVPacket *pkt, int flush);
516 
518 
519 /**
520  * Return the frame duration in seconds. Return 0 if not available.
521  */
522 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
523  AVCodecParserContext *pc, AVPacket *pkt);
524 
525 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
526 
527 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
528 
529 /**
530  * Select a PCM codec based on the given parameters.
531  *
532  * @param bps bits-per-sample
533  * @param flt floating-point
534  * @param be big-endian
535  * @param sflags signed flags. each bit corresponds to one byte of bit depth.
536  * e.g. the 1st bit indicates if 8-bit should be signed or
537  * unsigned, the 2nd bit indicates if 16-bit should be signed or
538  * unsigned, etc... This is useful for formats such as WAVE where
539  * only 8-bit is unsigned and all other bit depths are signed.
540  * @return a PCM codec id or AV_CODEC_ID_NONE
541  */
542 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
543 
544 /**
545  * Chooses a timebase for muxing the specified stream.
546  *
547  * The chosen timebase allows sample accurate timestamps based
548  * on the framerate or sample rate for audio streams. It also is
549  * at least as precise as 1/min_precision would be.
550  */
551 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
552 
553 /**
554  * Chooses a timebase for muxing the specified stream.
555  */
557 
558 /**
559  * Generate standard extradata for AVC-Intra based on width/height and field
560  * order.
561  */
563 
564 /**
565  * Add a bitstream filter to a stream.
566  *
567  * @param st output stream to add a filter to
568  * @param name the name of the filter to add
569  * @param args filter-specific argument string
570  * @return >0 on success;
571  * AVERROR code on failure
572  */
573 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
574 
575 /**
576  * Copy encoding parameters from source to destination stream
577  *
578  * @param dst pointer to destination AVStream
579  * @param src pointer to source AVStream
580  * @return >=0 on success, AVERROR code on error
581  */
583 
584 /**
585  * Wrap errno on rename() error.
586  *
587  * @param oldpath source path
588  * @param newpath destination path
589  * @return 0 or AVERROR on failure
590  */
591 static inline int ff_rename(const char *oldpath, const char *newpath, void *logctx)
592 {
593  int ret = 0;
594  if (rename(oldpath, newpath) == -1) {
595  ret = AVERROR(errno);
596  if (logctx) {
597  char err[AV_ERROR_MAX_STRING_SIZE] = {0};
599  av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", oldpath, newpath, err);
600  }
601  }
602  return ret;
603 }
604 
605 /**
606  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
607  * which is always set to 0.
608  *
609  * Previously allocated extradata in par will be freed.
610  *
611  * @param size size of extradata
612  * @return 0 if OK, AVERROR_xxx on error
613  */
615 
616 /**
617  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
618  * which is always set to 0 and fill it from pb.
619  *
620  * @param size size of extradata
621  * @return >= 0 if OK, AVERROR_xxx on error
622  */
624 
625 /**
626  * add frame for rfps calculation.
627  *
628  * @param dts timestamp of the i-th frame
629  * @return 0 if OK, AVERROR_xxx on error
630  */
631 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
632 
634 
635 /**
636  * Flags for AVFormatContext.write_uncoded_frame()
637  */
639 
640  /**
641  * Query whether the feature is possible on this stream.
642  * The frame argument is ignored.
643  */
645 
646 };
647 
648 /**
649  * Copies the whilelists from one context to the other
650  */
652 
653 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
655 
656 /**
657  * Returned by demuxers to indicate that data was consumed but discarded
658  * (ignored streams or junk data). The framework will re-call the demuxer.
659  */
660 #define FFERROR_REDO FFERRTAG('R','E','D','O')
661 
662 /**
663  * Utility function to open IO stream of output format.
664  *
665  * @param s AVFormatContext
666  * @param url URL or file name to open for writing
667  * @options optional options which will be passed to io_open callback
668  * @return >=0 on success, negative AVERROR in case of failure
669  */
670 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
671 
672 /*
673  * A wrapper around AVFormatContext.io_close that should be used
674  * instead of calling the pointer directly.
675  */
677 
678 /**
679  * Utility function to check if the file uses http or https protocol
680  *
681  * @param s AVFormatContext
682  * @param filename URL or file name to open for writing
683  */
684 int ff_is_http_proto(char *filename);
685 
686 /**
687  * Parse creation_time in AVFormatContext metadata if exists and warn if the
688  * parsing fails.
689  *
690  * @param s AVFormatContext
691  * @param timestamp parsed timestamp in microseconds, only set on successful parsing
692  * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
693  * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
694  */
695 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
696 
697 /**
698  * Standardize creation_time metadata in AVFormatContext to an ISO-8601
699  * timestamp string.
700  *
701  * @param s AVFormatContext
702  * @return <0 on error
703  */
705 
706 #define CONTAINS_PAL 2
707 /**
708  * Reshuffles the lines to use the user specified stride.
709  *
710  * @param ppkt input and output packet
711  * @return negative error code or
712  * 0 if no new packet was allocated
713  * non-zero if a new packet was allocated and ppkt has to be freed
714  * CONTAINS_PAL if in addition to a new packet the old contained a palette
715  */
716 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
717 
718 /**
719  * Retrieves the palette from a packet, either from side data, or
720  * appended to the video data in the packet itself (raw video only).
721  * It is commonly used after a call to ff_reshuffle_raw_rgb().
722  *
723  * Use 0 for the ret parameter to check for side data only.
724  *
725  * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
726  * @param ret return value from ff_reshuffle_raw_rgb(), or 0
727  * @param palette pointer to palette buffer
728  * @return negative error code or
729  * 1 if the packet has a palette, else 0
730  */
731 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
732 
733 /**
734  * Finalize buf into extradata and set its size appropriately.
735  */
736 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
737 
738 /**
739  * Find the next packet in the interleaving queue for the given stream.
740  * The pkt parameter is filled in with the queued packet, including
741  * references to the data (which the caller is not allowed to keep or
742  * modify).
743  *
744  * @return 0 if a packet was found, a negative value if no packet was found
745  */
746 int ff_interleaved_peek(AVFormatContext *s, int stream,
747  AVPacket *pkt, int add_offset);
748 
749 
750 int ff_lock_avformat(void);
751 int ff_unlock_avformat(void);
752 
753 /**
754  * Set AVFormatContext url field to the provided pointer. The pointer must
755  * point to a valid string. The existing url field is freed if necessary. Also
756  * set the legacy filename field to the same string which was provided in url.
757  */
758 void ff_format_set_url(AVFormatContext *s, char *url);
759 
760 #define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) /**< Create a new reference for the packet instead of
761  transferring the ownership of the existing one to the
762  list. */
763 
764 /**
765  * Append an AVPacket to the list.
766  *
767  * @param head List head element
768  * @param tail List tail element
769  * @param pkt The packet being appended
770  * @param flags Any combination of FF_PACKETLIST_FLAG_* flags
771  * @return 0 on success, negative AVERROR value on failure. On failure,
772  the list is unchanged
773  */
774 int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
775  AVPacket *pkt, int flags);
776 
777 /**
778  * Remove the oldest AVPacket in the list and return it.
779  *
780  * @note The pkt will be overwritten completely. The caller owns the
781  * packet and must unref it by itself.
782  *
783  * @param head List head element
784  * @param tail List tail element
785  * @param pkt Pointer to an initialized AVPacket struct
786  */
787 int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
788  AVPacket *pkt);
789 
790 /**
791  * Wipe the list and unref all the packets in it.
792  *
793  * @param head List head element
794  * @param tail List tail element
795  */
796 void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);
797 
798 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
799 
800 #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:366
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:3124
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:4882
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
int ff_mkdir_p(const char *path)
Automatically create sub-directories.
Definition: utils.c:4799
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:31
The bitstream filter state.
Definition: avcodec.h:5703
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:3114
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:2048
int ff_is_http_proto(char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:5677
#define src
Definition: vp8dsp.c:254
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3892
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:4583
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:1953
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:1918
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:1967
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:644
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:5670
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:5660
uint32_t tag
Definition: movenc.c:1483
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
Definition: utils.c:2091
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
Copy encoding parameters from source to destination stream.
Definition: utils.c:4268
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
int raw_packet_buffer_remaining_size
Definition: internal.h:101
#define av_log(a,...)
void ff_rfps_calculate(AVFormatContext *ic)
Definition: utils.c:3379
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:4641
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:5682
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:5014
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5699
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:618
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:5340
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:4966
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:3287
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:4381
#define width
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:5708
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:5830
int64_t num
Definition: internal.h:62
struct AVStreamInternal::@252 extract_extradata
#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
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:4646
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts)
add frame for rfps calculation.
Definition: utils.c:3321
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:1980
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:1533
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:591
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:2269
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:3136
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:5733
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:1419
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:4854
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:2231
#define flags(name, subs,...)
Definition: cbs_av1.c:596
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:4912
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:1550
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3324
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:3305
unsigned bps
Definition: movenc.c:1484
AVWriteUncodedFrameFlags
Flags for AVFormatContext.write_uncoded_frame()
Definition: internal.h:638
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:5545
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:531
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:4833
This structure stores compressed data.
Definition: avcodec.h:1422
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:2163
struct AVPacketList * raw_packet_buffer_end
Definition: internal.h:91
const char * name
Definition: opengl_enc.c:103