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 dynarray_add(tab, nb_ptr, elem)\
197 __typeof__(tab) _tab = (tab);\
198 __typeof__(elem) _elem = (elem);\
199 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
200 av_dynarray_add(_tab, nb_ptr, _elem);\
203 #define dynarray_add(tab, nb_ptr, elem)\
205 av_dynarray_add((tab), nb_ptr, (elem));\
209 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
212 * Automatically create sub-directories
214 * @param path will create sub-directories by path
215 * @return 0, or < 0 on error
217 int ff_mkdir_p(const char *path);
219 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
222 * Parse a string of hexadecimal strings. Any space between the hexadecimal
225 * @param data if non-null, the parsed data is written to this pointer
226 * @param p the string to parse
227 * @return the number of bytes written (or to be written, if data is null)
229 int ff_hex_to_data(uint8_t *data, const char *p);
232 * Add packet to an AVFormatContext's packet_buffer list, determining its
233 * interleaved position using compare() function argument.
234 * @return 0 on success, < 0 on error. pkt will always be blank on return.
236 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
237 int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
239 void ff_read_frame_flush(AVFormatContext *s);
241 #define NTP_OFFSET 2208988800ULL
242 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
244 /** Get the current time since NTP epoch in microseconds. */
245 uint64_t ff_ntp_time(void);
248 * Get the NTP time stamp formatted as per the RFC-5905.
250 * @param ntp_time NTP time in micro seconds (since NTP epoch)
251 * @return the formatted NTP time stamp
253 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
256 * Append the media-specific SDP fragment for the media stream c
257 * to the buffer buff.
259 * Note, the buffer needs to be initialized, since it is appended to
262 * @param buff the buffer to append the SDP fragment to
263 * @param size the size of the buff buffer
264 * @param st the AVStream of the media to describe
265 * @param idx the global stream index
266 * @param dest_addr the destination address of the media stream, may be NULL
267 * @param dest_type the destination address type, may be NULL
268 * @param port the destination port of the media stream, 0 if unknown
269 * @param ttl the time to live of the stream, 0 if not multicast
270 * @param fmt the AVFormatContext, which might contain options modifying
273 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
274 const char *dest_addr, const char *dest_type,
275 int port, int ttl, AVFormatContext *fmt);
278 * Write a packet to another muxer than the one the user originally
279 * intended. Useful when chaining muxers, where one muxer internally
280 * writes a received packet to another muxer.
282 * @param dst the muxer to write the packet to
283 * @param dst_stream the stream index within dst to write the packet to
284 * @param pkt the packet to be written
285 * @param src the muxer the packet originally was intended for
286 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
287 * @return the value av_write_frame returned
289 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
290 AVFormatContext *src, int interleave);
293 * Get the length in bytes which is needed to store val as v.
295 int ff_get_v_length(uint64_t val);
298 * Put val using a variable number of bytes.
300 void ff_put_v(AVIOContext *bc, uint64_t val);
303 * Read a whole line of text from AVIOContext. Stop reading after reaching
304 * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
305 * and may be truncated if the buffer is too small.
307 * @param s the read-only AVIOContext
308 * @param buf buffer to store the read line
309 * @param maxlen size of the buffer
310 * @return the length of the string written in the buffer, not including the
313 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
316 * Same as ff_get_line but strip the white-space characters in the text tail
318 * @param s the read-only AVIOContext
319 * @param buf buffer to store the read line
320 * @param maxlen size of the buffer
321 * @return the length of the string written in the buffer
323 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
326 * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
327 * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
328 * ending characters are NOT included in the buffer, but they are skipped on
331 * @param s the read-only AVIOContext
332 * @param bp the AVBPrint buffer
333 * @return the length of the read line, not including the line endings,
336 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
339 * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
340 * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
341 * EOF. The line ending characters are NOT included in the buffer, but they
342 * are skipped on the input.
344 * @param s the read-only AVIOContext
345 * @param bp the AVBPrint buffer
346 * @return the length of the read line not including the line endings,
347 * negative on error, or if the buffer becomes truncated.
349 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
351 #define SPACE_CHARS " \t\r\n"
354 * Callback function type for ff_parse_key_value.
356 * @param key a pointer to the key
357 * @param key_len the number of bytes that belong to the key, including the '='
359 * @param dest return the destination pointer for the value in *dest, may
360 * be null to ignore the value
361 * @param dest_len the length of the *dest buffer
363 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
364 int key_len, char **dest, int *dest_len);
366 * Parse a string with comma-separated key=value pairs. The value strings
367 * may be quoted and may contain escaped characters within quoted strings.
369 * @param str the string to parse
370 * @param callback_get_buf function that returns where to store the
371 * unescaped value string.
372 * @param context the opaque context pointer to pass to callback_get_buf
374 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
378 * Find stream index based on format-specific stream ID
379 * @return stream index, or < 0 on error
381 int ff_find_stream_index(AVFormatContext *s, int id);
384 * Internal version of av_index_search_timestamp
386 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
387 int64_t wanted_timestamp, int flags);
390 * Internal version of av_add_index_entry
392 int ff_add_index_entry(AVIndexEntry **index_entries,
393 int *nb_index_entries,
394 unsigned int *index_entries_allocated_size,
395 int64_t pos, int64_t timestamp, int size, int distance, int flags);
397 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
402 * @param s media file handle
403 * @param id unique ID for this chapter
404 * @param start chapter start time in time_base units
405 * @param end chapter end time in time_base units
406 * @param title chapter title
408 * @return AVChapter or NULL on error
410 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
411 int64_t start, int64_t end, const char *title);
414 * Ensure the index uses less memory than the maximum specified in
415 * AVFormatContext.max_index_size by discarding entries if it grows
418 void ff_reduce_index(AVFormatContext *s, int stream_index);
420 enum AVCodecID ff_guess_image2_codec(const char *filename);
423 * Perform a binary search using av_index_search_timestamp() and
424 * AVInputFormat.read_timestamp().
426 * @param target_ts target timestamp in the time base of the given stream
427 * @param stream_index stream number
429 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
430 int64_t target_ts, int flags);
433 * Update cur_dts of all streams based on the given timestamp and AVStream.
435 * Stream ref_st unchanged, others set cur_dts in their native time base.
436 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
437 * @param timestamp new dts expressed in time_base of param ref_st
438 * @param ref_st reference stream giving time_base of param timestamp
440 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
442 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
443 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
446 * Perform a binary search using read_timestamp().
448 * @param target_ts target timestamp in the time base of the given stream
449 * @param stream_index stream number
451 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
452 int64_t target_ts, int64_t pos_min,
453 int64_t pos_max, int64_t pos_limit,
454 int64_t ts_min, int64_t ts_max,
455 int flags, int64_t *ts_ret,
456 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
459 * Set the time base and wrapping info for a given stream. This will be used
460 * to interpret the stream's timestamps. If the new time base is invalid
461 * (numerator or denominator are non-positive), it leaves the stream
465 * @param pts_wrap_bits number of bits effectively used by the pts
466 * (used for wrap control)
467 * @param pts_num time base numerator
468 * @param pts_den time base denominator
470 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
471 unsigned int pts_num, unsigned int pts_den);
474 * Add side data to a packet for changing parameters to the given values.
475 * Parameters set to 0 aren't included in the change.
477 int ff_add_param_change(AVPacket *pkt, int32_t channels,
478 uint64_t channel_layout, int32_t sample_rate,
479 int32_t width, int32_t height);
482 * Set the timebase for each stream from the corresponding codec timebase and
485 int ff_framehash_write_header(AVFormatContext *s);
488 * Read a transport packet from a media file.
490 * @param s media file handle
491 * @param pkt is filled
492 * @return 0 if OK, AVERROR_xxx on error
494 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
497 * Interleave an AVPacket per dts so it can be muxed.
499 * @param s an AVFormatContext for output. pkt resp. out will be added to
500 * resp. taken from its packet buffer.
501 * @param out the interleaved packet will be output here
502 * @param pkt the input packet; will be blank on return if not NULL
503 * @param flush 1 if no further packets are available as input and all
504 * remaining packets should be output
505 * @return 1 if a packet was output, 0 if no packet could be output
506 * (in which case out may be uninitialized), < 0 if an error occurred
508 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
509 AVPacket *pkt, int flush);
511 void ff_free_stream(AVFormatContext *s, AVStream *st);
514 * Return the frame duration in seconds. Return 0 if not available.
516 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
517 AVCodecParserContext *pc, AVPacket *pkt);
519 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
521 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
524 * Select a PCM codec based on the given parameters.
526 * @param bps bits-per-sample
527 * @param flt floating-point
528 * @param be big-endian
529 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
530 * e.g. the 1st bit indicates if 8-bit should be signed or
531 * unsigned, the 2nd bit indicates if 16-bit should be signed or
532 * unsigned, etc... This is useful for formats such as WAVE where
533 * only 8-bit is unsigned and all other bit depths are signed.
534 * @return a PCM codec id or AV_CODEC_ID_NONE
536 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
539 * Chooses a timebase for muxing the specified stream.
541 * The chosen timebase allows sample accurate timestamps based
542 * on the framerate or sample rate for audio streams. It also is
543 * at least as precise as 1/min_precision would be.
545 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
548 * Chooses a timebase for muxing the specified stream.
550 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
553 * Generate standard extradata for AVC-Intra based on width/height and field
556 int ff_generate_avci_extradata(AVStream *st);
559 * Add a bitstream filter to a stream.
561 * @param st output stream to add a filter to
562 * @param name the name of the filter to add
563 * @param args filter-specific argument string
564 * @return >0 on success;
565 * AVERROR code on failure
567 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
570 * Copy encoding parameters from source to destination stream
572 * @param dst pointer to destination AVStream
573 * @param src pointer to source AVStream
574 * @return >=0 on success, AVERROR code on error
576 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
579 * Wrap avpriv_io_move and log if error happens.
581 * @param url_src source path
582 * @param url_dst destination path
583 * @return 0 or AVERROR on failure
585 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
588 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
589 * which is always set to 0.
591 * Previously allocated extradata in par will be freed.
593 * @param size size of extradata
594 * @return 0 if OK, AVERROR_xxx on error
596 int ff_alloc_extradata(AVCodecParameters *par, int size);
599 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
600 * which is always set to 0 and fill it from pb.
602 * @param size size of extradata
603 * @return >= 0 if OK, AVERROR_xxx on error
605 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
608 * add frame for rfps calculation.
610 * @param dts timestamp of the i-th frame
611 * @return 0 if OK, AVERROR_xxx on error
613 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
615 void ff_rfps_calculate(AVFormatContext *ic);
618 * Flags for AVFormatContext.write_uncoded_frame()
620 enum AVWriteUncodedFrameFlags {
623 * Query whether the feature is possible on this stream.
624 * The frame argument is ignored.
626 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
631 * Copies the whilelists from one context to the other
633 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
636 * Returned by demuxers to indicate that data was consumed but discarded
637 * (ignored streams or junk data). The framework will re-call the demuxer.
639 #define FFERROR_REDO FFERRTAG('R','E','D','O')
642 * Utility function to open IO stream of output format.
644 * @param s AVFormatContext
645 * @param url URL or file name to open for writing
646 * @options optional options which will be passed to io_open callback
647 * @return >=0 on success, negative AVERROR in case of failure
649 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
652 * A wrapper around AVFormatContext.io_close that should be used
653 * instead of calling the pointer directly.
655 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
658 * Utility function to check if the file uses http or https protocol
660 * @param s AVFormatContext
661 * @param filename URL or file name to open for writing
663 int ff_is_http_proto(char *filename);
666 * Parse creation_time in AVFormatContext metadata if exists and warn if the
669 * @param s AVFormatContext
670 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
671 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
672 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
674 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
677 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
680 * @param s AVFormatContext
681 * @return <0 on error
683 int ff_standardize_creation_time(AVFormatContext *s);
685 #define CONTAINS_PAL 2
687 * Reshuffles the lines to use the user specified stride.
689 * @param ppkt input and output packet
690 * @return negative error code or
691 * 0 if no new packet was allocated
692 * non-zero if a new packet was allocated and ppkt has to be freed
693 * CONTAINS_PAL if in addition to a new packet the old contained a palette
695 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
698 * Retrieves the palette from a packet, either from side data, or
699 * appended to the video data in the packet itself (raw video only).
700 * It is commonly used after a call to ff_reshuffle_raw_rgb().
702 * Use 0 for the ret parameter to check for side data only.
704 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
705 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
706 * @param palette pointer to palette buffer
707 * @return negative error code or
708 * 1 if the packet has a palette, else 0
710 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
713 * Finalize buf into extradata and set its size appropriately.
715 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
718 * Find the next packet in the interleaving queue for the given stream.
719 * The pkt parameter is filled in with the queued packet, including
720 * references to the data (which the caller is not allowed to keep or
723 * @return 0 if a packet was found, a negative value if no packet was found
725 int ff_interleaved_peek(AVFormatContext *s, int stream,
726 AVPacket *pkt, int add_offset);
729 int ff_lock_avformat(void);
730 int ff_unlock_avformat(void);
733 * Set AVFormatContext url field to the provided pointer. The pointer must
734 * point to a valid string. The existing url field is freed if necessary. Also
735 * set the legacy filename field to the same string which was provided in url.
737 void ff_format_set_url(AVFormatContext *s, char *url);
739 #define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) /**< Create a new reference for the packet instead of
740 transferring the ownership of the existing one to the
744 * Append an AVPacket to the list.
746 * @param head List head element
747 * @param tail List tail element
748 * @param pkt The packet being appended. The data described in it will
749 * be made reference counted if it isn't already.
750 * @param flags Any combination of FF_PACKETLIST_FLAG_* flags
751 * @return 0 on success, negative AVERROR value on failure. On failure,
752 the list is unchanged
754 int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
755 AVPacket *pkt, int flags);
758 * Remove the oldest AVPacket in the list and return it.
759 * The behaviour is undefined if the packet list is empty.
761 * @note The pkt will be overwritten completely. The caller owns the
762 * packet and must unref it by itself.
764 * @param head List head element
765 * @param tail List tail element
766 * @param pkt Pointer to an AVPacket struct
767 * @return 0 on success. Success is guaranteed
768 * if the packet list is not empty.
770 int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
774 * Wipe the list and unref all the packets in it.
776 * @param head List head element
777 * @param tail List tail element
779 void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);
781 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
783 #endif /* AVFORMAT_INTERNAL_H */