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 * Set if chapter ids are strictly monotonic.
149 int chapter_ids_monotonic;
152 struct AVStreamInternal {
154 * Set to 1 if the codec allows reordering, so pts can be different
160 * bitstream filter to run on stream
161 * - encoding: Set by muxer using ff_stream_add_bitstream_filter
167 * Whether or not check_bitstream should still be run on each packet
169 int bitstream_checked;
172 * The codec context used by avformat_find_stream_info, the parser, etc.
174 AVCodecContext *avctx;
176 * 1 if avctx has been initialized with the values from the codec parameters
180 enum AVCodecID orig_codec_id;
182 /* the context for extracting extradata in find_stream_info()
183 * inited=1/bsf=NULL signals that extracting is not possible (codec not
192 * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
194 int need_context_update;
200 #define MAX_STD_TIMEBASES (30*12+30+3+6)
202 * Stream information used internally by avformat_find_stream_info()
206 int64_t duration_gcd;
208 int64_t rfps_duration_sum;
209 double (*duration_error)[2][MAX_STD_TIMEBASES];
210 int64_t codec_info_duration;
211 int64_t codec_info_duration_fields;
212 int frame_delay_evidence;
215 * 0 -> decoder has not been searched for yet.
216 * >0 -> decoder found
217 * <0 -> decoder with codec_id == -found_decoder has not been found
221 int64_t last_duration;
224 * Those are used for average framerate estimation.
226 int64_t fps_first_dts;
227 int fps_first_dts_idx;
228 int64_t fps_last_dts;
229 int fps_last_dts_idx;
233 AVIndexEntry *index_entries; /**< Only used if the format does not
234 support seeking natively. */
235 int nb_index_entries;
236 unsigned int index_entries_allocated_size;
238 int64_t interleaver_chunk_size;
239 int64_t interleaver_chunk_duration;
242 * stream probing state
243 * -1 -> probing finished
244 * 0 -> no probing requested
245 * rest -> perform probing with request_probe being the minimum score to accept.
249 * Indicates that everything up to the next keyframe
250 * should be discarded.
252 int skip_to_keyframe;
255 * Number of samples to skip at the start of the frame decoded from the next packet.
260 * If not 0, the number of samples that should be skipped from the start of
261 * the stream (the samples are removed from packets with pts==0, which also
262 * assumes negative timestamps do not happen).
263 * Intended for use with formats such as mp3 with ad-hoc gapless audio
266 int64_t start_skip_samples;
269 * If not 0, the first audio sample that should be discarded from the stream.
270 * This is broken by design (needs global sample count), but can't be
271 * avoided for broken by design formats such as mp3 with ad-hoc gapless
274 int64_t first_discard_sample;
277 * The sample after last sample that is intended to be discarded after
278 * first_discard_sample. Works on frame boundaries only. Used to prevent
279 * early EOF if the gapless info is broken (considered concatenated mp3s).
281 int64_t last_discard_sample;
284 * Number of internally decoded frames, used internally in libavformat, do not access
285 * its lifetime differs from info which is why it is not in that structure.
287 int nb_decoded_frames;
290 * Timestamp offset added to timestamps before muxing
292 int64_t mux_ts_offset;
295 * Internal data to check for wrapping of the time stamp
297 int64_t pts_wrap_reference;
300 * Options for behavior, when a wrap is detected.
302 * Defined by AV_PTS_WRAP_ values.
304 * If correction is enabled, there are two possibilities:
305 * If the first time stamp is near the wrap point, the wrap offset
306 * will be subtracted, which will create negative time stamps.
307 * Otherwise the offset will be added.
309 int pts_wrap_behavior;
312 * Internal data to prevent doing update_initial_durations() twice
314 int update_initial_durations_done;
316 #define MAX_REORDER_DELAY 16
319 * Internal data to generate dts from pts
321 int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
322 uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
324 int64_t pts_buffer[MAX_REORDER_DELAY+1];
327 * Internal data to analyze DTS and detect faulty mpeg streams
329 int64_t last_dts_for_order_check;
331 uint8_t dts_misordered;
334 * Internal data to inject global side data
336 int inject_global_side_data;
339 * display aspect ratio (0 if unknown)
341 * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
343 AVRational display_aspect_ratio;
345 AVProbeData probe_data;
348 * last packet in packet_buffer for this stream when muxing.
350 struct AVPacketList *last_in_packet_buffer;
354 #define dynarray_add(tab, nb_ptr, elem)\
356 __typeof__(tab) _tab = (tab);\
357 __typeof__(elem) _elem = (elem);\
358 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
359 av_dynarray_add(_tab, nb_ptr, _elem);\
362 #define dynarray_add(tab, nb_ptr, elem)\
364 av_dynarray_add((tab), nb_ptr, (elem));\
368 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
371 * Automatically create sub-directories
373 * @param path will create sub-directories by path
374 * @return 0, or < 0 on error
376 int ff_mkdir_p(const char *path);
378 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
381 * Parse a string of hexadecimal strings. Any space between the hexadecimal
384 * @param data if non-null, the parsed data is written to this pointer
385 * @param p the string to parse
386 * @return the number of bytes written (or to be written, if data is null)
388 int ff_hex_to_data(uint8_t *data, const char *p);
391 * Add packet to an AVFormatContext's packet_buffer list, determining its
392 * interleaved position using compare() function argument.
393 * @return 0 on success, < 0 on error. pkt will always be blank on return.
395 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
396 int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
398 void ff_read_frame_flush(AVFormatContext *s);
400 #define NTP_OFFSET 2208988800ULL
401 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
403 /** Get the current time since NTP epoch in microseconds. */
404 uint64_t ff_ntp_time(void);
407 * Get the NTP time stamp formatted as per the RFC-5905.
409 * @param ntp_time NTP time in micro seconds (since NTP epoch)
410 * @return the formatted NTP time stamp
412 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
415 * Append the media-specific SDP fragment for the media stream c
416 * to the buffer buff.
418 * Note, the buffer needs to be initialized, since it is appended to
421 * @param buff the buffer to append the SDP fragment to
422 * @param size the size of the buff buffer
423 * @param st the AVStream of the media to describe
424 * @param idx the global stream index
425 * @param dest_addr the destination address of the media stream, may be NULL
426 * @param dest_type the destination address type, may be NULL
427 * @param port the destination port of the media stream, 0 if unknown
428 * @param ttl the time to live of the stream, 0 if not multicast
429 * @param fmt the AVFormatContext, which might contain options modifying
432 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
433 const char *dest_addr, const char *dest_type,
434 int port, int ttl, AVFormatContext *fmt);
437 * Write a packet to another muxer than the one the user originally
438 * intended. Useful when chaining muxers, where one muxer internally
439 * writes a received packet to another muxer.
441 * @param dst the muxer to write the packet to
442 * @param dst_stream the stream index within dst to write the packet to
443 * @param pkt the packet to be written
444 * @param src the muxer the packet originally was intended for
445 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
446 * @return the value av_write_frame returned
448 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
449 AVFormatContext *src, int interleave);
452 * Read a whole line of text from AVIOContext. Stop reading after reaching
453 * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
454 * and may be truncated if the buffer is too small.
456 * @param s the read-only AVIOContext
457 * @param buf buffer to store the read line
458 * @param maxlen size of the buffer
459 * @return the length of the string written in the buffer, not including the
462 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
465 * Same as ff_get_line but strip the white-space characters in the text tail
467 * @param s the read-only AVIOContext
468 * @param buf buffer to store the read line
469 * @param maxlen size of the buffer
470 * @return the length of the string written in the buffer
472 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
475 * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
476 * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
477 * ending characters are NOT included in the buffer, but they are skipped on
480 * @param s the read-only AVIOContext
481 * @param bp the AVBPrint buffer
482 * @return the length of the read line, not including the line endings,
485 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
488 * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
489 * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
490 * EOF. The line ending characters are NOT included in the buffer, but they
491 * are skipped on the input.
493 * @param s the read-only AVIOContext
494 * @param bp the AVBPrint buffer
495 * @return the length of the read line not including the line endings,
496 * negative on error, or if the buffer becomes truncated.
498 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
500 #define SPACE_CHARS " \t\r\n"
503 * Callback function type for ff_parse_key_value.
505 * @param key a pointer to the key
506 * @param key_len the number of bytes that belong to the key, including the '='
508 * @param dest return the destination pointer for the value in *dest, may
509 * be null to ignore the value
510 * @param dest_len the length of the *dest buffer
512 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
513 int key_len, char **dest, int *dest_len);
515 * Parse a string with comma-separated key=value pairs. The value strings
516 * may be quoted and may contain escaped characters within quoted strings.
518 * @param str the string to parse
519 * @param callback_get_buf function that returns where to store the
520 * unescaped value string.
521 * @param context the opaque context pointer to pass to callback_get_buf
523 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
527 * Find stream index based on format-specific stream ID
528 * @return stream index, or < 0 on error
530 int ff_find_stream_index(AVFormatContext *s, int id);
533 * Internal version of av_index_search_timestamp
535 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
536 int64_t wanted_timestamp, int flags);
539 * Internal version of av_add_index_entry
541 int ff_add_index_entry(AVIndexEntry **index_entries,
542 int *nb_index_entries,
543 unsigned int *index_entries_allocated_size,
544 int64_t pos, int64_t timestamp, int size, int distance, int flags);
546 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
551 * @param s media file handle
552 * @param id unique ID for this chapter
553 * @param start chapter start time in time_base units
554 * @param end chapter end time in time_base units
555 * @param title chapter title
557 * @return AVChapter or NULL on error
559 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
560 int64_t start, int64_t end, const char *title);
563 * Ensure the index uses less memory than the maximum specified in
564 * AVFormatContext.max_index_size by discarding entries if it grows
567 void ff_reduce_index(AVFormatContext *s, int stream_index);
569 enum AVCodecID ff_guess_image2_codec(const char *filename);
572 * Perform a binary search using av_index_search_timestamp() and
573 * AVInputFormat.read_timestamp().
575 * @param target_ts target timestamp in the time base of the given stream
576 * @param stream_index stream number
578 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
579 int64_t target_ts, int flags);
582 * Update cur_dts of all streams based on the given timestamp and AVStream.
584 * Stream ref_st unchanged, others set cur_dts in their native time base.
585 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
586 * @param timestamp new dts expressed in time_base of param ref_st
587 * @param ref_st reference stream giving time_base of param timestamp
589 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
591 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
592 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
595 * Perform a binary search using read_timestamp().
597 * @param target_ts target timestamp in the time base of the given stream
598 * @param stream_index stream number
600 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
601 int64_t target_ts, int64_t pos_min,
602 int64_t pos_max, int64_t pos_limit,
603 int64_t ts_min, int64_t ts_max,
604 int flags, int64_t *ts_ret,
605 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
608 * Set the time base and wrapping info for a given stream. This will be used
609 * to interpret the stream's timestamps. If the new time base is invalid
610 * (numerator or denominator are non-positive), it leaves the stream
614 * @param pts_wrap_bits number of bits effectively used by the pts
615 * (used for wrap control)
616 * @param pts_num time base numerator
617 * @param pts_den time base denominator
619 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
620 unsigned int pts_num, unsigned int pts_den);
623 * Add side data to a packet for changing parameters to the given values.
624 * Parameters set to 0 aren't included in the change.
626 int ff_add_param_change(AVPacket *pkt, int32_t channels,
627 uint64_t channel_layout, int32_t sample_rate,
628 int32_t width, int32_t height);
631 * Set the timebase for each stream from the corresponding codec timebase and
634 int ff_framehash_write_header(AVFormatContext *s);
637 * Read a transport packet from a media file.
639 * @param s media file handle
640 * @param pkt is filled
641 * @return 0 if OK, AVERROR_xxx on error
643 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
646 * Interleave an AVPacket per dts so it can be muxed.
648 * @param s an AVFormatContext for output. pkt resp. out will be added to
649 * resp. taken from its packet buffer.
650 * @param out the interleaved packet will be output here
651 * @param pkt the input packet; will be blank on return if not NULL
652 * @param flush 1 if no further packets are available as input and all
653 * remaining packets should be output
654 * @return 1 if a packet was output, 0 if no packet could be output
655 * (in which case out may be uninitialized), < 0 if an error occurred
657 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
658 AVPacket *pkt, int flush);
660 void ff_free_stream(AVFormatContext *s, AVStream *st);
663 * Return the frame duration in seconds. Return 0 if not available.
665 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
666 AVCodecParserContext *pc, AVPacket *pkt);
668 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
670 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
672 int ff_is_intra_only(enum AVCodecID id);
675 * Select a PCM codec based on the given parameters.
677 * @param bps bits-per-sample
678 * @param flt floating-point
679 * @param be big-endian
680 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
681 * e.g. the 1st bit indicates if 8-bit should be signed or
682 * unsigned, the 2nd bit indicates if 16-bit should be signed or
683 * unsigned, etc... This is useful for formats such as WAVE where
684 * only 8-bit is unsigned and all other bit depths are signed.
685 * @return a PCM codec id or AV_CODEC_ID_NONE
687 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
690 * Chooses a timebase for muxing the specified stream.
692 * The chosen timebase allows sample accurate timestamps based
693 * on the framerate or sample rate for audio streams. It also is
694 * at least as precise as 1/min_precision would be.
696 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
699 * Chooses a timebase for muxing the specified stream.
701 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
704 * Generate standard extradata for AVC-Intra based on width/height and field
707 int ff_generate_avci_extradata(AVStream *st);
710 * Add a bitstream filter to a stream.
712 * @param st output stream to add a filter to
713 * @param name the name of the filter to add
714 * @param args filter-specific argument string
715 * @return >0 on success;
716 * AVERROR code on failure
718 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
721 * Copy encoding parameters from source to destination stream
723 * @param dst pointer to destination AVStream
724 * @param src pointer to source AVStream
725 * @return >=0 on success, AVERROR code on error
727 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
730 * Wrap avpriv_io_move and log if error happens.
732 * @param url_src source path
733 * @param url_dst destination path
734 * @return 0 or AVERROR on failure
736 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
739 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
740 * which is always set to 0.
742 * Previously allocated extradata in par will be freed.
744 * @param size size of extradata
745 * @return 0 if OK, AVERROR_xxx on error
747 int ff_alloc_extradata(AVCodecParameters *par, int size);
750 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
751 * which is always set to 0 and fill it from pb.
753 * @param size size of extradata
754 * @return >= 0 if OK, AVERROR_xxx on error
756 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
759 * add frame for rfps calculation.
761 * @param dts timestamp of the i-th frame
762 * @return 0 if OK, AVERROR_xxx on error
764 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
766 void ff_rfps_calculate(AVFormatContext *ic);
769 * Flags for AVFormatContext.write_uncoded_frame()
771 enum AVWriteUncodedFrameFlags {
774 * Query whether the feature is possible on this stream.
775 * The frame argument is ignored.
777 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
782 * Copies the whilelists from one context to the other
784 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
787 * Returned by demuxers to indicate that data was consumed but discarded
788 * (ignored streams or junk data). The framework will re-call the demuxer.
790 #define FFERROR_REDO FFERRTAG('R','E','D','O')
793 * Utility function to open IO stream of output format.
795 * @param s AVFormatContext
796 * @param url URL or file name to open for writing
797 * @options optional options which will be passed to io_open callback
798 * @return >=0 on success, negative AVERROR in case of failure
800 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
803 * A wrapper around AVFormatContext.io_close that should be used
804 * instead of calling the pointer directly.
806 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
809 * Utility function to check if the file uses http or https protocol
811 * @param s AVFormatContext
812 * @param filename URL or file name to open for writing
814 int ff_is_http_proto(char *filename);
817 * Parse creation_time in AVFormatContext metadata if exists and warn if the
820 * @param s AVFormatContext
821 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
822 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
823 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
825 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
828 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
831 * @param s AVFormatContext
832 * @return <0 on error
834 int ff_standardize_creation_time(AVFormatContext *s);
836 #define CONTAINS_PAL 2
838 * Reshuffles the lines to use the user specified stride.
840 * @param ppkt input and output packet
841 * @return negative error code or
842 * 0 if no new packet was allocated
843 * non-zero if a new packet was allocated and ppkt has to be freed
844 * CONTAINS_PAL if in addition to a new packet the old contained a palette
846 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
849 * Retrieves the palette from a packet, either from side data, or
850 * appended to the video data in the packet itself (raw video only).
851 * It is commonly used after a call to ff_reshuffle_raw_rgb().
853 * Use 0 for the ret parameter to check for side data only.
855 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
856 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
857 * @param palette pointer to palette buffer
858 * @return negative error code or
859 * 1 if the packet has a palette, else 0
861 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
864 * Finalize buf into extradata and set its size appropriately.
866 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
869 * Find the next packet in the interleaving queue for the given stream.
870 * The pkt parameter is filled in with the queued packet, including
871 * references to the data (which the caller is not allowed to keep or
874 * @return 0 if a packet was found, a negative value if no packet was found
876 int ff_interleaved_peek(AVFormatContext *s, int stream,
877 AVPacket *pkt, int add_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 */