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 PacketList *packet_buffer;
77 struct PacketList *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 PacketList *raw_packet_buffer;
89 struct PacketList *raw_packet_buffer_end;
91 * Packets split by the parser get queued here.
93 struct PacketList *parse_queue;
94 struct PacketList *parse_queue_end;
97 * Used to hold temporary packets.
101 * Remaining size available for raw_packet_buffer, in bytes.
103 #define RAW_PACKET_BUFFER_SIZE 2500000
104 int raw_packet_buffer_remaining_size;
107 * Offset to remap timestamps to be non-negative.
108 * Expressed in timebase units.
109 * @see AVStream.mux_ts_offset
114 * Timebase for the timestamp offset.
116 AVRational offset_timebase;
118 #if FF_API_COMPUTE_PKT_FIELDS2
119 int missing_ts_warning;
122 int inject_global_side_data;
124 int avoid_negative_ts_use_pts;
127 * Timestamp of the end of the shortest stream.
129 int64_t shortest_end;
132 * Whether or not avformat_init_output has already been called
137 * Whether or not avformat_init_output fully initialized streams
139 int streams_initialized;
142 * ID3v2 tag useful for MP3 demuxing
144 AVDictionary *id3v2_meta;
147 * Prefer the codec framerate for avg_frame_rate computation.
149 int prefer_codec_framerate;
152 * Set if chapter ids are strictly monotonic.
154 int chapter_ids_monotonic;
157 struct AVStreamInternal {
159 * Set to 1 if the codec allows reordering, so pts can be different
165 * bitstream filter to run on stream
166 * - encoding: Set by muxer using ff_stream_add_bitstream_filter
172 * Whether or not check_bitstream should still be run on each packet
174 int bitstream_checked;
177 * The codec context used by avformat_find_stream_info, the parser, etc.
179 AVCodecContext *avctx;
181 * 1 if avctx has been initialized with the values from the codec parameters
185 enum AVCodecID orig_codec_id;
187 /* the context for extracting extradata in find_stream_info()
188 * inited=1/bsf=NULL signals that extracting is not possible (codec not
197 * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
199 int need_context_update;
205 #define MAX_STD_TIMEBASES (30*12+30+3+6)
207 * Stream information used internally by avformat_find_stream_info()
211 int64_t duration_gcd;
213 int64_t rfps_duration_sum;
214 double (*duration_error)[2][MAX_STD_TIMEBASES];
215 int64_t codec_info_duration;
216 int64_t codec_info_duration_fields;
217 int frame_delay_evidence;
220 * 0 -> decoder has not been searched for yet.
221 * >0 -> decoder found
222 * <0 -> decoder with codec_id == -found_decoder has not been found
226 int64_t last_duration;
229 * Those are used for average framerate estimation.
231 int64_t fps_first_dts;
232 int fps_first_dts_idx;
233 int64_t fps_last_dts;
234 int fps_last_dts_idx;
238 AVIndexEntry *index_entries; /**< Only used if the format does not
239 support seeking natively. */
240 int nb_index_entries;
241 unsigned int index_entries_allocated_size;
243 int64_t interleaver_chunk_size;
244 int64_t interleaver_chunk_duration;
247 * stream probing state
248 * -1 -> probing finished
249 * 0 -> no probing requested
250 * rest -> perform probing with request_probe being the minimum score to accept.
254 * Indicates that everything up to the next keyframe
255 * should be discarded.
257 int skip_to_keyframe;
260 * Number of samples to skip at the start of the frame decoded from the next packet.
265 * If not 0, the number of samples that should be skipped from the start of
266 * the stream (the samples are removed from packets with pts==0, which also
267 * assumes negative timestamps do not happen).
268 * Intended for use with formats such as mp3 with ad-hoc gapless audio
271 int64_t start_skip_samples;
274 * If not 0, the first audio sample that should be discarded from the stream.
275 * This is broken by design (needs global sample count), but can't be
276 * avoided for broken by design formats such as mp3 with ad-hoc gapless
279 int64_t first_discard_sample;
282 * The sample after last sample that is intended to be discarded after
283 * first_discard_sample. Works on frame boundaries only. Used to prevent
284 * early EOF if the gapless info is broken (considered concatenated mp3s).
286 int64_t last_discard_sample;
289 * Number of internally decoded frames, used internally in libavformat, do not access
290 * its lifetime differs from info which is why it is not in that structure.
292 int nb_decoded_frames;
295 * Timestamp offset added to timestamps before muxing
297 int64_t mux_ts_offset;
300 * Internal data to check for wrapping of the time stamp
302 int64_t pts_wrap_reference;
305 * Options for behavior, when a wrap is detected.
307 * Defined by AV_PTS_WRAP_ values.
309 * If correction is enabled, there are two possibilities:
310 * If the first time stamp is near the wrap point, the wrap offset
311 * will be subtracted, which will create negative time stamps.
312 * Otherwise the offset will be added.
314 int pts_wrap_behavior;
317 * Internal data to prevent doing update_initial_durations() twice
319 int update_initial_durations_done;
321 #define MAX_REORDER_DELAY 16
324 * Internal data to generate dts from pts
326 int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
327 uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
329 int64_t pts_buffer[MAX_REORDER_DELAY+1];
332 * Internal data to analyze DTS and detect faulty mpeg streams
334 int64_t last_dts_for_order_check;
336 uint8_t dts_misordered;
339 * Internal data to inject global side data
341 int inject_global_side_data;
344 * display aspect ratio (0 if unknown)
346 * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
348 AVRational display_aspect_ratio;
350 AVProbeData probe_data;
353 * last packet in packet_buffer for this stream when muxing.
355 struct PacketList *last_in_packet_buffer;
359 #define dynarray_add(tab, nb_ptr, elem)\
361 __typeof__(tab) _tab = (tab);\
362 __typeof__(elem) _elem = (elem);\
363 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
364 av_dynarray_add(_tab, nb_ptr, _elem);\
367 #define dynarray_add(tab, nb_ptr, elem)\
369 av_dynarray_add((tab), nb_ptr, (elem));\
374 * Automatically create sub-directories
376 * @param path will create sub-directories by path
377 * @return 0, or < 0 on error
379 int ff_mkdir_p(const char *path);
381 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
384 * Parse a string of hexadecimal strings. Any space between the hexadecimal
387 * @param data if non-null, the parsed data is written to this pointer
388 * @param p the string to parse
389 * @return the number of bytes written (or to be written, if data is null)
391 int ff_hex_to_data(uint8_t *data, const char *p);
394 * Add packet to an AVFormatContext's packet_buffer list, determining its
395 * interleaved position using compare() function argument.
396 * @return 0 on success, < 0 on error. pkt will always be blank on return.
398 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
399 int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
401 void ff_read_frame_flush(AVFormatContext *s);
403 #define NTP_OFFSET 2208988800ULL
404 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
406 /** Get the current time since NTP epoch in microseconds. */
407 uint64_t ff_ntp_time(void);
410 * Get the NTP time stamp formatted as per the RFC-5905.
412 * @param ntp_time NTP time in micro seconds (since NTP epoch)
413 * @return the formatted NTP time stamp
415 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
418 * Append the media-specific SDP fragment for the media stream c
419 * to the buffer buff.
421 * Note, the buffer needs to be initialized, since it is appended to
424 * @param buff the buffer to append the SDP fragment to
425 * @param size the size of the buff buffer
426 * @param st the AVStream of the media to describe
427 * @param idx the global stream index
428 * @param dest_addr the destination address of the media stream, may be NULL
429 * @param dest_type the destination address type, may be NULL
430 * @param port the destination port of the media stream, 0 if unknown
431 * @param ttl the time to live of the stream, 0 if not multicast
432 * @param fmt the AVFormatContext, which might contain options modifying
435 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
436 const char *dest_addr, const char *dest_type,
437 int port, int ttl, AVFormatContext *fmt);
440 * Write a packet to another muxer than the one the user originally
441 * intended. Useful when chaining muxers, where one muxer internally
442 * writes a received packet to another muxer.
444 * @param dst the muxer to write the packet to
445 * @param dst_stream the stream index within dst to write the packet to
446 * @param pkt the packet to be written
447 * @param src the muxer the packet originally was intended for
448 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
449 * @return the value av_write_frame returned
451 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
452 AVFormatContext *src, int interleave);
455 * Read a whole line of text from AVIOContext. Stop reading after reaching
456 * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
457 * and may be truncated if the buffer is too small.
459 * @param s the read-only AVIOContext
460 * @param buf buffer to store the read line
461 * @param maxlen size of the buffer
462 * @return the length of the string written in the buffer, not including the
465 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
468 * Same as ff_get_line but strip the white-space characters in the text tail
470 * @param s the read-only AVIOContext
471 * @param buf buffer to store the read line
472 * @param maxlen size of the buffer
473 * @return the length of the string written in the buffer
475 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
478 * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
479 * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
480 * ending characters are NOT included in the buffer, but they are skipped on
483 * @param s the read-only AVIOContext
484 * @param bp the AVBPrint buffer
485 * @return the length of the read line, not including the line endings,
488 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
491 * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
492 * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
493 * EOF. The line ending characters are NOT included in the buffer, but they
494 * are skipped on the input.
496 * @param s the read-only AVIOContext
497 * @param bp the AVBPrint buffer
498 * @return the length of the read line not including the line endings,
499 * negative on error, or if the buffer becomes truncated.
501 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
503 #define SPACE_CHARS " \t\r\n"
506 * Callback function type for ff_parse_key_value.
508 * @param key a pointer to the key
509 * @param key_len the number of bytes that belong to the key, including the '='
511 * @param dest return the destination pointer for the value in *dest, may
512 * be null to ignore the value
513 * @param dest_len the length of the *dest buffer
515 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
516 int key_len, char **dest, int *dest_len);
518 * Parse a string with comma-separated key=value pairs. The value strings
519 * may be quoted and may contain escaped characters within quoted strings.
521 * @param str the string to parse
522 * @param callback_get_buf function that returns where to store the
523 * unescaped value string.
524 * @param context the opaque context pointer to pass to callback_get_buf
526 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
530 * Find stream index based on format-specific stream ID
531 * @return stream index, or < 0 on error
533 int ff_find_stream_index(AVFormatContext *s, int id);
536 * Internal version of av_index_search_timestamp
538 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
539 int64_t wanted_timestamp, int flags);
542 * Internal version of av_add_index_entry
544 int ff_add_index_entry(AVIndexEntry **index_entries,
545 int *nb_index_entries,
546 unsigned int *index_entries_allocated_size,
547 int64_t pos, int64_t timestamp, int size, int distance, int flags);
549 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
554 * @param s media file handle
555 * @param id unique ID for this chapter
556 * @param start chapter start time in time_base units
557 * @param end chapter end time in time_base units
558 * @param title chapter title
560 * @return AVChapter or NULL on error
562 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
563 int64_t start, int64_t end, const char *title);
566 * Ensure the index uses less memory than the maximum specified in
567 * AVFormatContext.max_index_size by discarding entries if it grows
570 void ff_reduce_index(AVFormatContext *s, int stream_index);
572 enum AVCodecID ff_guess_image2_codec(const char *filename);
575 * Perform a binary search using av_index_search_timestamp() and
576 * AVInputFormat.read_timestamp().
578 * @param target_ts target timestamp in the time base of the given stream
579 * @param stream_index stream number
581 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
582 int64_t target_ts, int flags);
585 * Update cur_dts of all streams based on the given timestamp and AVStream.
587 * Stream ref_st unchanged, others set cur_dts in their native time base.
588 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
589 * @param timestamp new dts expressed in time_base of param ref_st
590 * @param ref_st reference stream giving time_base of param timestamp
592 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
594 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
595 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
598 * Perform a binary search using read_timestamp().
600 * @param target_ts target timestamp in the time base of the given stream
601 * @param stream_index stream number
603 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
604 int64_t target_ts, int64_t pos_min,
605 int64_t pos_max, int64_t pos_limit,
606 int64_t ts_min, int64_t ts_max,
607 int flags, int64_t *ts_ret,
608 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
611 * Set the time base and wrapping info for a given stream. This will be used
612 * to interpret the stream's timestamps. If the new time base is invalid
613 * (numerator or denominator are non-positive), it leaves the stream
617 * @param pts_wrap_bits number of bits effectively used by the pts
618 * (used for wrap control)
619 * @param pts_num time base numerator
620 * @param pts_den time base denominator
622 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
623 unsigned int pts_num, unsigned int pts_den);
626 * Add side data to a packet for changing parameters to the given values.
627 * Parameters set to 0 aren't included in the change.
629 int ff_add_param_change(AVPacket *pkt, int32_t channels,
630 uint64_t channel_layout, int32_t sample_rate,
631 int32_t width, int32_t height);
634 * Set the timebase for each stream from the corresponding codec timebase and
637 int ff_framehash_write_header(AVFormatContext *s);
640 * Read a transport packet from a media file.
642 * @param s media file handle
643 * @param pkt is filled
644 * @return 0 if OK, AVERROR_xxx on error
646 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
649 * Interleave an AVPacket per dts so it can be muxed.
651 * @param s an AVFormatContext for output. pkt resp. out will be added to
652 * resp. taken from its packet buffer.
653 * @param out the interleaved packet will be output here
654 * @param pkt the input packet; will be blank on return if not NULL
655 * @param flush 1 if no further packets are available as input and all
656 * remaining packets should be output
657 * @return 1 if a packet was output, 0 if no packet could be output
658 * (in which case out may be uninitialized), < 0 if an error occurred
660 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
661 AVPacket *pkt, int flush);
663 void ff_free_stream(AVFormatContext *s, AVStream *st);
666 * Return the frame duration in seconds. Return 0 if not available.
668 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
669 AVCodecParserContext *pc, AVPacket *pkt);
671 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
673 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
675 int ff_is_intra_only(enum AVCodecID id);
678 * Select a PCM codec based on the given parameters.
680 * @param bps bits-per-sample
681 * @param flt floating-point
682 * @param be big-endian
683 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
684 * e.g. the 1st bit indicates if 8-bit should be signed or
685 * unsigned, the 2nd bit indicates if 16-bit should be signed or
686 * unsigned, etc... This is useful for formats such as WAVE where
687 * only 8-bit is unsigned and all other bit depths are signed.
688 * @return a PCM codec id or AV_CODEC_ID_NONE
690 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
693 * Chooses a timebase for muxing the specified stream.
695 * The chosen timebase allows sample accurate timestamps based
696 * on the framerate or sample rate for audio streams. It also is
697 * at least as precise as 1/min_precision would be.
699 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
702 * Chooses a timebase for muxing the specified stream.
704 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
707 * Generate standard extradata for AVC-Intra based on width/height and field
710 int ff_generate_avci_extradata(AVStream *st);
713 * Add a bitstream filter to a stream.
715 * @param st output stream to add a filter to
716 * @param name the name of the filter to add
717 * @param args filter-specific argument string
718 * @return >0 on success;
719 * AVERROR code on failure
721 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
724 * Copy encoding parameters from source to destination stream
726 * @param dst pointer to destination AVStream
727 * @param src pointer to source AVStream
728 * @return >=0 on success, AVERROR code on error
730 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
733 * Wrap avpriv_io_move and log if error happens.
735 * @param url_src source path
736 * @param url_dst destination path
737 * @return 0 or AVERROR on failure
739 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
742 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
743 * which is always set to 0.
745 * Previously allocated extradata in par will be freed.
747 * @param size size of extradata
748 * @return 0 if OK, AVERROR_xxx on error
750 int ff_alloc_extradata(AVCodecParameters *par, int size);
753 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
754 * which is always set to 0 and fill it from pb.
756 * @param size size of extradata
757 * @return >= 0 if OK, AVERROR_xxx on error
759 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
762 * add frame for rfps calculation.
764 * @param dts timestamp of the i-th frame
765 * @return 0 if OK, AVERROR_xxx on error
767 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
769 void ff_rfps_calculate(AVFormatContext *ic);
772 * Flags for AVFormatContext.write_uncoded_frame()
774 enum AVWriteUncodedFrameFlags {
777 * Query whether the feature is possible on this stream.
778 * The frame argument is ignored.
780 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
785 * Copies the whilelists from one context to the other
787 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
790 * Returned by demuxers to indicate that data was consumed but discarded
791 * (ignored streams or junk data). The framework will re-call the demuxer.
793 #define FFERROR_REDO FFERRTAG('R','E','D','O')
796 * Utility function to open IO stream of output format.
798 * @param s AVFormatContext
799 * @param url URL or file name to open for writing
800 * @options optional options which will be passed to io_open callback
801 * @return >=0 on success, negative AVERROR in case of failure
803 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
806 * A wrapper around AVFormatContext.io_close that should be used
807 * instead of calling the pointer directly.
809 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
812 * Utility function to check if the file uses http or https protocol
814 * @param s AVFormatContext
815 * @param filename URL or file name to open for writing
817 int ff_is_http_proto(char *filename);
820 * Parse creation_time in AVFormatContext metadata if exists and warn if the
823 * @param s AVFormatContext
824 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
825 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
826 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
828 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
831 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
834 * @param s AVFormatContext
835 * @return <0 on error
837 int ff_standardize_creation_time(AVFormatContext *s);
839 #define CONTAINS_PAL 2
841 * Reshuffles the lines to use the user specified stride.
843 * @param ppkt input and output packet
844 * @return negative error code or
845 * 0 if no new packet was allocated
846 * non-zero if a new packet was allocated and ppkt has to be freed
847 * CONTAINS_PAL if in addition to a new packet the old contained a palette
849 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
852 * Retrieves the palette from a packet, either from side data, or
853 * appended to the video data in the packet itself (raw video only).
854 * It is commonly used after a call to ff_reshuffle_raw_rgb().
856 * Use 0 for the ret parameter to check for side data only.
858 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
859 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
860 * @param palette pointer to palette buffer
861 * @return negative error code or
862 * 1 if the packet has a palette, else 0
864 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
867 * Finalize buf into extradata and set its size appropriately.
869 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
872 * Find the next packet in the interleaving queue for the given stream.
874 * @return a pointer to a packet if one was found, NULL otherwise.
876 const AVPacket *ff_interleaved_peek(AVFormatContext *s, int stream);
878 int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset);
880 int ff_lock_avformat(void);
881 int ff_unlock_avformat(void);
884 * Set AVFormatContext url field to the provided pointer. The pointer must
885 * point to a valid string. The existing url field is freed if necessary. Also
886 * set the legacy filename field to the same string which was provided in url.
888 void ff_format_set_url(AVFormatContext *s, char *url);
890 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
892 #endif /* AVFORMAT_INTERNAL_H */