2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVFORMAT_INTERNAL_H
22 #define AVFORMAT_INTERNAL_H
26 #include "libavutil/bprint.h"
28 #include "os_support.h"
30 #define MAX_URL_SIZE 4096
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)
37 # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
39 # define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
42 typedef struct AVCodecTag {
47 typedef struct CodecMime{
52 /*************************************************/
53 /* fractional numbers for exact pts handling */
56 * The exact value of the fractional number is: 'val + num / den'.
57 * num is assumed to be 0 <= num < den.
59 typedef struct FFFrac {
60 int64_t val, num, den;
64 struct AVFormatInternal {
66 * Number of streams relevant for interleaving.
69 int nb_interleaved_streams;
72 * This buffer is only needed when packets were already buffered but
73 * not decoded, for example to get the codec parameters in MPEG
76 struct AVPacketList *packet_buffer;
77 struct AVPacketList *packet_buffer_end;
79 /* av_seek_frame() support */
80 int64_t data_offset; /**< offset of the first packet */
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
88 struct AVPacketList *raw_packet_buffer;
89 struct AVPacketList *raw_packet_buffer_end;
91 * Packets split by the parser get queued here.
93 struct AVPacketList *parse_queue;
94 struct AVPacketList *parse_queue_end;
96 * Remaining size available for raw_packet_buffer, in bytes.
98 #define RAW_PACKET_BUFFER_SIZE 2500000
99 int raw_packet_buffer_remaining_size;
102 * Offset to remap timestamps to be non-negative.
103 * Expressed in timebase units.
104 * @see AVStream.mux_ts_offset
109 * Timebase for the timestamp offset.
111 AVRational offset_timebase;
113 #if FF_API_COMPUTE_PKT_FIELDS2
114 int missing_ts_warning;
117 int inject_global_side_data;
119 int avoid_negative_ts_use_pts;
122 * Timestamp of the end of the shortest stream.
124 int64_t shortest_end;
127 * Whether or not avformat_init_output has already been called
132 * Whether or not avformat_init_output fully initialized streams
134 int streams_initialized;
137 * ID3v2 tag useful for MP3 demuxing
139 AVDictionary *id3v2_meta;
142 * Prefer the codec framerate for avg_frame_rate computation.
144 int prefer_codec_framerate;
147 struct AVStreamInternal {
149 * Set to 1 if the codec allows reordering, so pts can be different
155 * bitstream filter to run on stream
156 * - encoding: Set by muxer using ff_stream_add_bitstream_filter
162 * Whether or not check_bitstream should still be run on each packet
164 int bitstream_checked;
167 * The codec context used by avformat_find_stream_info, the parser, etc.
169 AVCodecContext *avctx;
171 * 1 if avctx has been initialized with the values from the codec parameters
175 enum AVCodecID orig_codec_id;
177 /* the context for extracting extradata in find_stream_info()
178 * inited=1/bsf=NULL signals that extracting is not possible (codec not
187 * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
189 int need_context_update;
195 #define MAX_STD_TIMEBASES (30*12+30+3+6)
197 * Stream information used internally by avformat_find_stream_info()
201 int64_t duration_gcd;
203 int64_t rfps_duration_sum;
204 double (*duration_error)[2][MAX_STD_TIMEBASES];
205 int64_t codec_info_duration;
206 int64_t codec_info_duration_fields;
207 int frame_delay_evidence;
210 * 0 -> decoder has not been searched for yet.
211 * >0 -> decoder found
212 * <0 -> decoder with codec_id == -found_decoder has not been found
216 int64_t last_duration;
219 * Those are used for average framerate estimation.
221 int64_t fps_first_dts;
222 int fps_first_dts_idx;
223 int64_t fps_last_dts;
224 int fps_last_dts_idx;
229 * Number of samples to skip at the start of the frame decoded from the next packet.
234 * If not 0, the number of samples that should be skipped from the start of
235 * the stream (the samples are removed from packets with pts==0, which also
236 * assumes negative timestamps do not happen).
237 * Intended for use with formats such as mp3 with ad-hoc gapless audio
240 int64_t start_skip_samples;
243 * If not 0, the first audio sample that should be discarded from the stream.
244 * This is broken by design (needs global sample count), but can't be
245 * avoided for broken by design formats such as mp3 with ad-hoc gapless
248 int64_t first_discard_sample;
251 * The sample after last sample that is intended to be discarded after
252 * first_discard_sample. Works on frame boundaries only. Used to prevent
253 * early EOF if the gapless info is broken (considered concatenated mp3s).
255 int64_t last_discard_sample;
258 * Number of internally decoded frames, used internally in libavformat, do not access
259 * its lifetime differs from info which is why it is not in that structure.
261 int nb_decoded_frames;
264 * Timestamp offset added to timestamps before muxing
266 int64_t mux_ts_offset;
269 * Internal data to check for wrapping of the time stamp
271 int64_t pts_wrap_reference;
274 * Options for behavior, when a wrap is detected.
276 * Defined by AV_PTS_WRAP_ values.
278 * If correction is enabled, there are two possibilities:
279 * If the first time stamp is near the wrap point, the wrap offset
280 * will be subtracted, which will create negative time stamps.
281 * Otherwise the offset will be added.
283 int pts_wrap_behavior;
286 * Internal data to prevent doing update_initial_durations() twice
288 int update_initial_durations_done;
291 * Internal data to generate dts from pts
293 int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
294 uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
297 * Internal data to analyze DTS and detect faulty mpeg streams
299 int64_t last_dts_for_order_check;
301 uint8_t dts_misordered;
304 * Internal data to inject global side data
306 int inject_global_side_data;
309 * display aspect ratio (0 if unknown)
311 * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
313 AVRational display_aspect_ratio;
317 #define dynarray_add(tab, nb_ptr, elem)\
319 __typeof__(tab) _tab = (tab);\
320 __typeof__(elem) _elem = (elem);\
321 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
322 av_dynarray_add(_tab, nb_ptr, _elem);\
325 #define dynarray_add(tab, nb_ptr, elem)\
327 av_dynarray_add((tab), nb_ptr, (elem));\
331 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
334 * Automatically create sub-directories
336 * @param path will create sub-directories by path
337 * @return 0, or < 0 on error
339 int ff_mkdir_p(const char *path);
341 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
344 * Parse a string of hexadecimal strings. Any space between the hexadecimal
347 * @param data if non-null, the parsed data is written to this pointer
348 * @param p the string to parse
349 * @return the number of bytes written (or to be written, if data is null)
351 int ff_hex_to_data(uint8_t *data, const char *p);
354 * Add packet to an AVFormatContext's packet_buffer list, determining its
355 * interleaved position using compare() function argument.
356 * @return 0 on success, < 0 on error. pkt will always be blank on return.
358 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
359 int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
361 void ff_read_frame_flush(AVFormatContext *s);
363 #define NTP_OFFSET 2208988800ULL
364 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
366 /** Get the current time since NTP epoch in microseconds. */
367 uint64_t ff_ntp_time(void);
370 * Get the NTP time stamp formatted as per the RFC-5905.
372 * @param ntp_time NTP time in micro seconds (since NTP epoch)
373 * @return the formatted NTP time stamp
375 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
378 * Append the media-specific SDP fragment for the media stream c
379 * to the buffer buff.
381 * Note, the buffer needs to be initialized, since it is appended to
384 * @param buff the buffer to append the SDP fragment to
385 * @param size the size of the buff buffer
386 * @param st the AVStream of the media to describe
387 * @param idx the global stream index
388 * @param dest_addr the destination address of the media stream, may be NULL
389 * @param dest_type the destination address type, may be NULL
390 * @param port the destination port of the media stream, 0 if unknown
391 * @param ttl the time to live of the stream, 0 if not multicast
392 * @param fmt the AVFormatContext, which might contain options modifying
395 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
396 const char *dest_addr, const char *dest_type,
397 int port, int ttl, AVFormatContext *fmt);
400 * Write a packet to another muxer than the one the user originally
401 * intended. Useful when chaining muxers, where one muxer internally
402 * writes a received packet to another muxer.
404 * @param dst the muxer to write the packet to
405 * @param dst_stream the stream index within dst to write the packet to
406 * @param pkt the packet to be written
407 * @param src the muxer the packet originally was intended for
408 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
409 * @return the value av_write_frame returned
411 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
412 AVFormatContext *src, int interleave);
415 * Read a whole line of text from AVIOContext. Stop reading after reaching
416 * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
417 * and may be truncated if the buffer is too small.
419 * @param s the read-only AVIOContext
420 * @param buf buffer to store the read line
421 * @param maxlen size of the buffer
422 * @return the length of the string written in the buffer, not including the
425 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
428 * Same as ff_get_line but strip the white-space characters in the text tail
430 * @param s the read-only AVIOContext
431 * @param buf buffer to store the read line
432 * @param maxlen size of the buffer
433 * @return the length of the string written in the buffer
435 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
438 * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
439 * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
440 * ending characters are NOT included in the buffer, but they are skipped on
443 * @param s the read-only AVIOContext
444 * @param bp the AVBPrint buffer
445 * @return the length of the read line, not including the line endings,
448 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
451 * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
452 * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
453 * EOF. The line ending characters are NOT included in the buffer, but they
454 * are skipped on the input.
456 * @param s the read-only AVIOContext
457 * @param bp the AVBPrint buffer
458 * @return the length of the read line not including the line endings,
459 * negative on error, or if the buffer becomes truncated.
461 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
463 #define SPACE_CHARS " \t\r\n"
466 * Callback function type for ff_parse_key_value.
468 * @param key a pointer to the key
469 * @param key_len the number of bytes that belong to the key, including the '='
471 * @param dest return the destination pointer for the value in *dest, may
472 * be null to ignore the value
473 * @param dest_len the length of the *dest buffer
475 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
476 int key_len, char **dest, int *dest_len);
478 * Parse a string with comma-separated key=value pairs. The value strings
479 * may be quoted and may contain escaped characters within quoted strings.
481 * @param str the string to parse
482 * @param callback_get_buf function that returns where to store the
483 * unescaped value string.
484 * @param context the opaque context pointer to pass to callback_get_buf
486 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
490 * Find stream index based on format-specific stream ID
491 * @return stream index, or < 0 on error
493 int ff_find_stream_index(AVFormatContext *s, int id);
496 * Internal version of av_index_search_timestamp
498 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
499 int64_t wanted_timestamp, int flags);
502 * Internal version of av_add_index_entry
504 int ff_add_index_entry(AVIndexEntry **index_entries,
505 int *nb_index_entries,
506 unsigned int *index_entries_allocated_size,
507 int64_t pos, int64_t timestamp, int size, int distance, int flags);
509 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
514 * @param s media file handle
515 * @param id unique ID for this chapter
516 * @param start chapter start time in time_base units
517 * @param end chapter end time in time_base units
518 * @param title chapter title
520 * @return AVChapter or NULL on error
522 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
523 int64_t start, int64_t end, const char *title);
526 * Ensure the index uses less memory than the maximum specified in
527 * AVFormatContext.max_index_size by discarding entries if it grows
530 void ff_reduce_index(AVFormatContext *s, int stream_index);
532 enum AVCodecID ff_guess_image2_codec(const char *filename);
535 * Perform a binary search using av_index_search_timestamp() and
536 * AVInputFormat.read_timestamp().
538 * @param target_ts target timestamp in the time base of the given stream
539 * @param stream_index stream number
541 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
542 int64_t target_ts, int flags);
545 * Update cur_dts of all streams based on the given timestamp and AVStream.
547 * Stream ref_st unchanged, others set cur_dts in their native time base.
548 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
549 * @param timestamp new dts expressed in time_base of param ref_st
550 * @param ref_st reference stream giving time_base of param timestamp
552 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
554 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
555 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
558 * Perform a binary search using read_timestamp().
560 * @param target_ts target timestamp in the time base of the given stream
561 * @param stream_index stream number
563 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
564 int64_t target_ts, int64_t pos_min,
565 int64_t pos_max, int64_t pos_limit,
566 int64_t ts_min, int64_t ts_max,
567 int flags, int64_t *ts_ret,
568 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
571 * Set the time base and wrapping info for a given stream. This will be used
572 * to interpret the stream's timestamps. If the new time base is invalid
573 * (numerator or denominator are non-positive), it leaves the stream
577 * @param pts_wrap_bits number of bits effectively used by the pts
578 * (used for wrap control)
579 * @param pts_num time base numerator
580 * @param pts_den time base denominator
582 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
583 unsigned int pts_num, unsigned int pts_den);
586 * Add side data to a packet for changing parameters to the given values.
587 * Parameters set to 0 aren't included in the change.
589 int ff_add_param_change(AVPacket *pkt, int32_t channels,
590 uint64_t channel_layout, int32_t sample_rate,
591 int32_t width, int32_t height);
594 * Set the timebase for each stream from the corresponding codec timebase and
597 int ff_framehash_write_header(AVFormatContext *s);
600 * Read a transport packet from a media file.
602 * @param s media file handle
603 * @param pkt is filled
604 * @return 0 if OK, AVERROR_xxx on error
606 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
609 * Interleave an AVPacket per dts so it can be muxed.
611 * @param s an AVFormatContext for output. pkt resp. out will be added to
612 * resp. taken from its packet buffer.
613 * @param out the interleaved packet will be output here
614 * @param pkt the input packet; will be blank on return if not NULL
615 * @param flush 1 if no further packets are available as input and all
616 * remaining packets should be output
617 * @return 1 if a packet was output, 0 if no packet could be output
618 * (in which case out may be uninitialized), < 0 if an error occurred
620 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
621 AVPacket *pkt, int flush);
623 void ff_free_stream(AVFormatContext *s, AVStream *st);
626 * Return the frame duration in seconds. Return 0 if not available.
628 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
629 AVCodecParserContext *pc, AVPacket *pkt);
631 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
633 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
635 int ff_is_intra_only(enum AVCodecID id);
638 * Select a PCM codec based on the given parameters.
640 * @param bps bits-per-sample
641 * @param flt floating-point
642 * @param be big-endian
643 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
644 * e.g. the 1st bit indicates if 8-bit should be signed or
645 * unsigned, the 2nd bit indicates if 16-bit should be signed or
646 * unsigned, etc... This is useful for formats such as WAVE where
647 * only 8-bit is unsigned and all other bit depths are signed.
648 * @return a PCM codec id or AV_CODEC_ID_NONE
650 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
653 * Chooses a timebase for muxing the specified stream.
655 * The chosen timebase allows sample accurate timestamps based
656 * on the framerate or sample rate for audio streams. It also is
657 * at least as precise as 1/min_precision would be.
659 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
662 * Chooses a timebase for muxing the specified stream.
664 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
667 * Generate standard extradata for AVC-Intra based on width/height and field
670 int ff_generate_avci_extradata(AVStream *st);
673 * Add a bitstream filter to a stream.
675 * @param st output stream to add a filter to
676 * @param name the name of the filter to add
677 * @param args filter-specific argument string
678 * @return >0 on success;
679 * AVERROR code on failure
681 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
684 * Copy encoding parameters from source to destination stream
686 * @param dst pointer to destination AVStream
687 * @param src pointer to source AVStream
688 * @return >=0 on success, AVERROR code on error
690 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
693 * Wrap avpriv_io_move and log if error happens.
695 * @param url_src source path
696 * @param url_dst destination path
697 * @return 0 or AVERROR on failure
699 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
702 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
703 * which is always set to 0.
705 * Previously allocated extradata in par will be freed.
707 * @param size size of extradata
708 * @return 0 if OK, AVERROR_xxx on error
710 int ff_alloc_extradata(AVCodecParameters *par, int size);
713 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
714 * which is always set to 0 and fill it from pb.
716 * @param size size of extradata
717 * @return >= 0 if OK, AVERROR_xxx on error
719 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
722 * add frame for rfps calculation.
724 * @param dts timestamp of the i-th frame
725 * @return 0 if OK, AVERROR_xxx on error
727 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
729 void ff_rfps_calculate(AVFormatContext *ic);
732 * Flags for AVFormatContext.write_uncoded_frame()
734 enum AVWriteUncodedFrameFlags {
737 * Query whether the feature is possible on this stream.
738 * The frame argument is ignored.
740 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
745 * Copies the whilelists from one context to the other
747 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
750 * Returned by demuxers to indicate that data was consumed but discarded
751 * (ignored streams or junk data). The framework will re-call the demuxer.
753 #define FFERROR_REDO FFERRTAG('R','E','D','O')
756 * Utility function to open IO stream of output format.
758 * @param s AVFormatContext
759 * @param url URL or file name to open for writing
760 * @options optional options which will be passed to io_open callback
761 * @return >=0 on success, negative AVERROR in case of failure
763 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
766 * A wrapper around AVFormatContext.io_close that should be used
767 * instead of calling the pointer directly.
769 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
772 * Utility function to check if the file uses http or https protocol
774 * @param s AVFormatContext
775 * @param filename URL or file name to open for writing
777 int ff_is_http_proto(char *filename);
780 * Parse creation_time in AVFormatContext metadata if exists and warn if the
783 * @param s AVFormatContext
784 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
785 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
786 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
788 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
791 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
794 * @param s AVFormatContext
795 * @return <0 on error
797 int ff_standardize_creation_time(AVFormatContext *s);
799 #define CONTAINS_PAL 2
801 * Reshuffles the lines to use the user specified stride.
803 * @param ppkt input and output packet
804 * @return negative error code or
805 * 0 if no new packet was allocated
806 * non-zero if a new packet was allocated and ppkt has to be freed
807 * CONTAINS_PAL if in addition to a new packet the old contained a palette
809 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
812 * Retrieves the palette from a packet, either from side data, or
813 * appended to the video data in the packet itself (raw video only).
814 * It is commonly used after a call to ff_reshuffle_raw_rgb().
816 * Use 0 for the ret parameter to check for side data only.
818 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
819 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
820 * @param palette pointer to palette buffer
821 * @return negative error code or
822 * 1 if the packet has a palette, else 0
824 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
827 * Finalize buf into extradata and set its size appropriately.
829 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
832 * Find the next packet in the interleaving queue for the given stream.
833 * The pkt parameter is filled in with the queued packet, including
834 * references to the data (which the caller is not allowed to keep or
837 * @return 0 if a packet was found, a negative value if no packet was found
839 int ff_interleaved_peek(AVFormatContext *s, int stream,
840 AVPacket *pkt, int add_offset);
843 int ff_lock_avformat(void);
844 int ff_unlock_avformat(void);
847 * Set AVFormatContext url field to the provided pointer. The pointer must
848 * point to a valid string. The existing url field is freed if necessary. Also
849 * set the legacy filename field to the same string which was provided in url.
851 void ff_format_set_url(AVFormatContext *s, char *url);
853 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
855 #endif /* AVFORMAT_INTERNAL_H */