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)
36 #define MAX_PROBE_PACKETS 2500
39 # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
41 # define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
44 typedef struct AVCodecTag {
49 typedef struct CodecMime{
54 /*************************************************/
55 /* fractional numbers for exact pts handling */
58 * The exact value of the fractional number is: 'val + num / den'.
59 * num is assumed to be 0 <= num < den.
61 typedef struct FFFrac {
62 int64_t val, num, den;
66 struct AVFormatInternal {
68 * Number of streams relevant for interleaving.
71 int nb_interleaved_streams;
74 * This buffer is only needed when packets were already buffered but
75 * not decoded, for example to get the codec parameters in MPEG
78 struct AVPacketList *packet_buffer;
79 struct AVPacketList *packet_buffer_end;
81 /* av_seek_frame() support */
82 int64_t data_offset; /**< offset of the first packet */
85 * Raw packets from the demuxer, prior to parsing and decoding.
86 * This buffer is used for buffering packets until the codec can
87 * be identified, as parsing cannot be done without knowing the
90 struct AVPacketList *raw_packet_buffer;
91 struct AVPacketList *raw_packet_buffer_end;
93 * Packets split by the parser get queued here.
95 struct AVPacketList *parse_queue;
96 struct AVPacketList *parse_queue_end;
98 * Remaining size available for raw_packet_buffer, in bytes.
100 #define RAW_PACKET_BUFFER_SIZE 2500000
101 int raw_packet_buffer_remaining_size;
104 * Offset to remap timestamps to be non-negative.
105 * Expressed in timebase units.
106 * @see AVStream.mux_ts_offset
111 * Timebase for the timestamp offset.
113 AVRational offset_timebase;
115 #if FF_API_COMPUTE_PKT_FIELDS2
116 int missing_ts_warning;
119 int inject_global_side_data;
121 int avoid_negative_ts_use_pts;
124 * Timestamp of the end of the shortest stream.
126 int64_t shortest_end;
129 * Whether or not avformat_init_output has already been called
134 * Whether or not avformat_init_output fully initialized streams
136 int streams_initialized;
139 * ID3v2 tag useful for MP3 demuxing
141 AVDictionary *id3v2_meta;
144 * Prefer the codec framerate for avg_frame_rate computation.
146 int prefer_codec_framerate;
149 struct AVStreamInternal {
151 * Set to 1 if the codec allows reordering, so pts can be different
157 * bitstream filters to run on stream
158 * - encoding: Set by muxer using ff_stream_add_bitstream_filter
161 AVBSFContext **bsfcs;
165 * Whether or not check_bitstream should still be run on each packet
167 int bitstream_checked;
170 * The codec context used by avformat_find_stream_info, the parser, etc.
172 AVCodecContext *avctx;
174 * 1 if avctx has been initialized with the values from the codec parameters
178 enum AVCodecID orig_codec_id;
180 /* the context for extracting extradata in find_stream_info()
181 * inited=1/bsf=NULL signals that extracting is not possible (codec not
190 * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
192 int need_context_update;
198 #define dynarray_add(tab, nb_ptr, elem)\
200 __typeof__(tab) _tab = (tab);\
201 __typeof__(elem) _elem = (elem);\
202 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
203 av_dynarray_add(_tab, nb_ptr, _elem);\
206 #define dynarray_add(tab, nb_ptr, elem)\
208 av_dynarray_add((tab), nb_ptr, (elem));\
212 struct tm *ff_brktimegm(time_t secs, struct tm *tm);
214 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
217 * Parse a string of hexadecimal strings. Any space between the hexadecimal
220 * @param data if non-null, the parsed data is written to this pointer
221 * @param p the string to parse
222 * @return the number of bytes written (or to be written, if data is null)
224 int ff_hex_to_data(uint8_t *data, const char *p);
227 * Add packet to AVFormatContext->packet_buffer list, determining its
228 * interleaved position using compare() function argument.
229 * @return 0, or < 0 on error
231 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
232 int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
234 void ff_read_frame_flush(AVFormatContext *s);
236 #define NTP_OFFSET 2208988800ULL
237 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
239 /** Get the current time since NTP epoch in microseconds. */
240 uint64_t ff_ntp_time(void);
243 * Append the media-specific SDP fragment for the media stream c
244 * to the buffer buff.
246 * Note, the buffer needs to be initialized, since it is appended to
249 * @param buff the buffer to append the SDP fragment to
250 * @param size the size of the buff buffer
251 * @param st the AVStream of the media to describe
252 * @param idx the global stream index
253 * @param dest_addr the destination address of the media stream, may be NULL
254 * @param dest_type the destination address type, may be NULL
255 * @param port the destination port of the media stream, 0 if unknown
256 * @param ttl the time to live of the stream, 0 if not multicast
257 * @param fmt the AVFormatContext, which might contain options modifying
260 void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
261 const char *dest_addr, const char *dest_type,
262 int port, int ttl, AVFormatContext *fmt);
265 * Write a packet to another muxer than the one the user originally
266 * intended. Useful when chaining muxers, where one muxer internally
267 * writes a received packet to another muxer.
269 * @param dst the muxer to write the packet to
270 * @param dst_stream the stream index within dst to write the packet to
271 * @param pkt the packet to be written
272 * @param src the muxer the packet originally was intended for
273 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
274 * @return the value av_write_frame returned
276 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
277 AVFormatContext *src, int interleave);
280 * Get the length in bytes which is needed to store val as v.
282 int ff_get_v_length(uint64_t val);
285 * Put val using a variable number of bytes.
287 void ff_put_v(AVIOContext *bc, uint64_t val);
290 * Read a whole line of text from AVIOContext. Stop reading after reaching
291 * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
292 * and may be truncated if the buffer is too small.
294 * @param s the read-only AVIOContext
295 * @param buf buffer to store the read line
296 * @param maxlen size of the buffer
297 * @return the length of the string written in the buffer, not including the
300 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
303 * Same as ff_get_line but strip the white-space characters in the text tail
305 * @param s the read-only AVIOContext
306 * @param buf buffer to store the read line
307 * @param maxlen size of the buffer
308 * @return the length of the string written in the buffer
310 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
313 * Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
314 * reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
315 * ending characters are NOT included in the buffer, but they are skipped on
318 * @param s the read-only AVIOContext
319 * @param bp the AVBPrint buffer
320 * @return the length of the read line, not including the line endings,
323 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
326 * Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
327 * its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
328 * EOF. The line ending characters are NOT included in the buffer, but they
329 * are skipped on the input.
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,
334 * negative on error, or if the buffer becomes truncated.
336 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
338 #define SPACE_CHARS " \t\r\n"
341 * Callback function type for ff_parse_key_value.
343 * @param key a pointer to the key
344 * @param key_len the number of bytes that belong to the key, including the '='
346 * @param dest return the destination pointer for the value in *dest, may
347 * be null to ignore the value
348 * @param dest_len the length of the *dest buffer
350 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
351 int key_len, char **dest, int *dest_len);
353 * Parse a string with comma-separated key=value pairs. The value strings
354 * may be quoted and may contain escaped characters within quoted strings.
356 * @param str the string to parse
357 * @param callback_get_buf function that returns where to store the
358 * unescaped value string.
359 * @param context the opaque context pointer to pass to callback_get_buf
361 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
365 * Find stream index based on format-specific stream ID
366 * @return stream index, or < 0 on error
368 int ff_find_stream_index(AVFormatContext *s, int id);
371 * Internal version of av_index_search_timestamp
373 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
374 int64_t wanted_timestamp, int flags);
377 * Internal version of av_add_index_entry
379 int ff_add_index_entry(AVIndexEntry **index_entries,
380 int *nb_index_entries,
381 unsigned int *index_entries_allocated_size,
382 int64_t pos, int64_t timestamp, int size, int distance, int flags);
384 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
389 * @param s media file handle
390 * @param id unique ID for this chapter
391 * @param start chapter start time in time_base units
392 * @param end chapter end time in time_base units
393 * @param title chapter title
395 * @return AVChapter or NULL on error
397 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
398 int64_t start, int64_t end, const char *title);
401 * Ensure the index uses less memory than the maximum specified in
402 * AVFormatContext.max_index_size by discarding entries if it grows
405 void ff_reduce_index(AVFormatContext *s, int stream_index);
407 enum AVCodecID ff_guess_image2_codec(const char *filename);
410 * Perform a binary search using av_index_search_timestamp() and
411 * AVInputFormat.read_timestamp().
413 * @param target_ts target timestamp in the time base of the given stream
414 * @param stream_index stream number
416 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
417 int64_t target_ts, int flags);
420 * Update cur_dts of all streams based on the given timestamp and AVStream.
422 * Stream ref_st unchanged, others set cur_dts in their native time base.
423 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
424 * @param timestamp new dts expressed in time_base of param ref_st
425 * @param ref_st reference stream giving time_base of param timestamp
427 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
429 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
430 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
433 * Perform a binary search using read_timestamp().
435 * @param target_ts target timestamp in the time base of the given stream
436 * @param stream_index stream number
438 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
439 int64_t target_ts, int64_t pos_min,
440 int64_t pos_max, int64_t pos_limit,
441 int64_t ts_min, int64_t ts_max,
442 int flags, int64_t *ts_ret,
443 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
446 * Set the time base and wrapping info for a given stream. This will be used
447 * to interpret the stream's timestamps. If the new time base is invalid
448 * (numerator or denominator are non-positive), it leaves the stream
452 * @param pts_wrap_bits number of bits effectively used by the pts
453 * (used for wrap control)
454 * @param pts_num time base numerator
455 * @param pts_den time base denominator
457 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
458 unsigned int pts_num, unsigned int pts_den);
461 * Add side data to a packet for changing parameters to the given values.
462 * Parameters set to 0 aren't included in the change.
464 int ff_add_param_change(AVPacket *pkt, int32_t channels,
465 uint64_t channel_layout, int32_t sample_rate,
466 int32_t width, int32_t height);
469 * Set the timebase for each stream from the corresponding codec timebase and
472 int ff_framehash_write_header(AVFormatContext *s);
475 * Read a transport packet from a media file.
477 * @param s media file handle
478 * @param pkt is filled
479 * @return 0 if OK, AVERROR_xxx on error
481 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
484 * Interleave a packet per dts in an output media file.
486 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
487 * function, so they cannot be used after it. Note that calling av_packet_unref()
488 * on them is still safe.
490 * @param s media file handle
491 * @param out the interleaved packet will be output here
492 * @param pkt the input packet
493 * @param flush 1 if no further packets are available as input and all
494 * remaining packets should be output
495 * @return 1 if a packet was output, 0 if no packet could be output,
496 * < 0 if an error occurred
498 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
499 AVPacket *pkt, int flush);
501 void ff_free_stream(AVFormatContext *s, AVStream *st);
504 * Return the frame duration in seconds. Return 0 if not available.
506 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
507 AVCodecParserContext *pc, AVPacket *pkt);
509 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
511 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
514 * Select a PCM codec based on the given parameters.
516 * @param bps bits-per-sample
517 * @param flt floating-point
518 * @param be big-endian
519 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
520 * e.g. the 1st bit indicates if 8-bit should be signed or
521 * unsigned, the 2nd bit indicates if 16-bit should be signed or
522 * unsigned, etc... This is useful for formats such as WAVE where
523 * only 8-bit is unsigned and all other bit depths are signed.
524 * @return a PCM codec id or AV_CODEC_ID_NONE
526 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
529 * Chooses a timebase for muxing the specified stream.
531 * The chosen timebase allows sample accurate timestamps based
532 * on the framerate or sample rate for audio streams. It also is
533 * at least as precise as 1/min_precision would be.
535 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
538 * Chooses a timebase for muxing the specified stream.
540 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
543 * Generate standard extradata for AVC-Intra based on width/height and field
546 int ff_generate_avci_extradata(AVStream *st);
549 * Add a bitstream filter to a stream.
551 * @param st output stream to add a filter to
552 * @param name the name of the filter to add
553 * @param args filter-specific argument string
554 * @return >0 on success;
555 * AVERROR code on failure
557 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
560 * Copy encoding parameters from source to destination stream
562 * @param dst pointer to destination AVStream
563 * @param src pointer to source AVStream
564 * @return >=0 on success, AVERROR code on error
566 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
569 * Wrap errno on rename() error.
571 * @param oldpath source path
572 * @param newpath destination path
573 * @return 0 or AVERROR on failure
575 static inline int ff_rename(const char *oldpath, const char *newpath, void *logctx)
578 if (rename(oldpath, newpath) == -1) {
579 ret = AVERROR(errno);
581 char err[AV_ERROR_MAX_STRING_SIZE] = {0};
582 av_make_error_string(err, AV_ERROR_MAX_STRING_SIZE, ret);
583 av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", oldpath, newpath, err);
590 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
591 * which is always set to 0.
593 * Previously allocated extradata in par will be freed.
595 * @param size size of extradata
596 * @return 0 if OK, AVERROR_xxx on error
598 int ff_alloc_extradata(AVCodecParameters *par, int size);
601 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
602 * which is always set to 0 and fill it from pb.
604 * @param size size of extradata
605 * @return >= 0 if OK, AVERROR_xxx on error
607 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
610 * add frame for rfps calculation.
612 * @param dts timestamp of the i-th frame
613 * @return 0 if OK, AVERROR_xxx on error
615 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
617 void ff_rfps_calculate(AVFormatContext *ic);
620 * Flags for AVFormatContext.write_uncoded_frame()
622 enum AVWriteUncodedFrameFlags {
625 * Query whether the feature is possible on this stream.
626 * The frame argument is ignored.
628 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
633 * Copies the whilelists from one context to the other
635 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
637 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
638 const AVIOInterruptCB *int_cb, AVDictionary **options);
641 * Returned by demuxers to indicate that data was consumed but discarded
642 * (ignored streams or junk data). The framework will re-call the demuxer.
644 #define FFERROR_REDO FFERRTAG('R','E','D','O')
647 * Utility function to open IO stream of output format.
649 * @param s AVFormatContext
650 * @param url URL or file name to open for writing
651 * @options optional options which will be passed to io_open callback
652 * @return >=0 on success, negative AVERROR in case of failure
654 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
657 * A wrapper around AVFormatContext.io_close that should be used
658 * instead of calling the pointer directly.
660 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
663 * Utility function to check if the file uses http or https protocol
665 * @param s AVFormatContext
666 * @param filename URL or file name to open for writing
668 int ff_is_http_proto(char *filename);
671 * Parse creation_time in AVFormatContext metadata if exists and warn if the
674 * @param s AVFormatContext
675 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
676 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
677 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
679 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
682 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
685 * @param s AVFormatContext
686 * @return <0 on error
688 int ff_standardize_creation_time(AVFormatContext *s);
690 #define CONTAINS_PAL 2
692 * Reshuffles the lines to use the user specified stride.
694 * @param ppkt input and output packet
695 * @return negative error code or
696 * 0 if no new packet was allocated
697 * non-zero if a new packet was allocated and ppkt has to be freed
698 * CONTAINS_PAL if in addition to a new packet the old contained a palette
700 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
703 * Retrieves the palette from a packet, either from side data, or
704 * appended to the video data in the packet itself (raw video only).
705 * It is commonly used after a call to ff_reshuffle_raw_rgb().
707 * Use 0 for the ret parameter to check for side data only.
709 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
710 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
711 * @param palette pointer to palette buffer
712 * @return negative error code or
713 * 1 if the packet has a palette, else 0
715 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
718 * Finalize buf into extradata and set its size appropriately.
720 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
723 * Find the next packet in the interleaving queue for the given stream.
724 * The pkt parameter is filled in with the queued packet, including
725 * references to the data (which the caller is not allowed to keep or
728 * @return 0 if a packet was found, a negative value if no packet was found
730 int ff_interleaved_peek(AVFormatContext *s, int stream,
731 AVPacket *pkt, int add_offset);
734 int ff_lock_avformat(void);
735 int ff_unlock_avformat(void);
738 * Set AVFormatContext url field to the provided pointer. The pointer must
739 * point to a valid string. The existing url field is freed if necessary. Also
740 * set the legacy filename field to the same string which was provided in url.
742 void ff_format_set_url(AVFormatContext *s, char *url);
744 #define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) /**< Create a new reference for the packet instead of
745 transferring the ownership of the existing one to the
749 * Append an AVPacket to the list.
751 * @param head List head element
752 * @param tail List tail element
753 * @param pkt The packet being appended
754 * @param flags Any combination of FF_PACKETLIST_FLAG_* flags
755 * @return 0 on success, negative AVERROR value on failure. On failure,
756 the list is unchanged
758 int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
759 AVPacket *pkt, int flags);
762 * Remove the oldest AVPacket in the list and return it.
764 * @note The pkt will be overwritten completely. The caller owns the
765 * packet and must unref it by itself.
767 * @param head List head element
768 * @param tail List tail element
769 * @param pkt Pointer to an initialized AVPacket struct
771 int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
775 * Wipe the list and unref all the packets in it.
777 * @param head List head element
778 * @param tail List tail element
780 void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);
782 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
784 #endif /* AVFORMAT_INTERNAL_H */