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);
302 #define SPACE_CHARS " \t\r\n"
305 * Callback function type for ff_parse_key_value.
307 * @param key a pointer to the key
308 * @param key_len the number of bytes that belong to the key, including the '='
310 * @param dest return the destination pointer for the value in *dest, may
311 * be null to ignore the value
312 * @param dest_len the length of the *dest buffer
314 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
315 int key_len, char **dest, int *dest_len);
317 * Parse a string with comma-separated key=value pairs. The value strings
318 * may be quoted and may contain escaped characters within quoted strings.
320 * @param str the string to parse
321 * @param callback_get_buf function that returns where to store the
322 * unescaped value string.
323 * @param context the opaque context pointer to pass to callback_get_buf
325 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
329 * Find stream index based on format-specific stream ID
330 * @return stream index, or < 0 on error
332 int ff_find_stream_index(AVFormatContext *s, int id);
335 * Internal version of av_index_search_timestamp
337 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
338 int64_t wanted_timestamp, int flags);
341 * Internal version of av_add_index_entry
343 int ff_add_index_entry(AVIndexEntry **index_entries,
344 int *nb_index_entries,
345 unsigned int *index_entries_allocated_size,
346 int64_t pos, int64_t timestamp, int size, int distance, int flags);
348 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
353 * @param s media file handle
354 * @param id unique ID for this chapter
355 * @param start chapter start time in time_base units
356 * @param end chapter end time in time_base units
357 * @param title chapter title
359 * @return AVChapter or NULL on error
361 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
362 int64_t start, int64_t end, const char *title);
365 * Ensure the index uses less memory than the maximum specified in
366 * AVFormatContext.max_index_size by discarding entries if it grows
369 void ff_reduce_index(AVFormatContext *s, int stream_index);
371 enum AVCodecID ff_guess_image2_codec(const char *filename);
374 * Perform a binary search using av_index_search_timestamp() and
375 * AVInputFormat.read_timestamp().
377 * @param target_ts target timestamp in the time base of the given stream
378 * @param stream_index stream number
380 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
381 int64_t target_ts, int flags);
384 * Update cur_dts of all streams based on the given timestamp and AVStream.
386 * Stream ref_st unchanged, others set cur_dts in their native time base.
387 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
388 * @param timestamp new dts expressed in time_base of param ref_st
389 * @param ref_st reference stream giving time_base of param timestamp
391 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
393 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
394 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
397 * Perform a binary search using read_timestamp().
399 * @param target_ts target timestamp in the time base of the given stream
400 * @param stream_index stream number
402 int64_t ff_gen_search(AVFormatContext *s, int stream_index,
403 int64_t target_ts, int64_t pos_min,
404 int64_t pos_max, int64_t pos_limit,
405 int64_t ts_min, int64_t ts_max,
406 int flags, int64_t *ts_ret,
407 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
410 * Set the time base and wrapping info for a given stream. This will be used
411 * to interpret the stream's timestamps. If the new time base is invalid
412 * (numerator or denominator are non-positive), it leaves the stream
416 * @param pts_wrap_bits number of bits effectively used by the pts
417 * (used for wrap control)
418 * @param pts_num time base numerator
419 * @param pts_den time base denominator
421 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
422 unsigned int pts_num, unsigned int pts_den);
425 * Add side data to a packet for changing parameters to the given values.
426 * Parameters set to 0 aren't included in the change.
428 int ff_add_param_change(AVPacket *pkt, int32_t channels,
429 uint64_t channel_layout, int32_t sample_rate,
430 int32_t width, int32_t height);
433 * Set the timebase for each stream from the corresponding codec timebase and
436 int ff_framehash_write_header(AVFormatContext *s);
439 * Read a transport packet from a media file.
441 * @param s media file handle
442 * @param pkt is filled
443 * @return 0 if OK, AVERROR_xxx on error
445 int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
448 * Interleave a packet per dts in an output media file.
450 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
451 * function, so they cannot be used after it. Note that calling av_packet_unref()
452 * on them is still safe.
454 * @param s media file handle
455 * @param out the interleaved packet will be output here
456 * @param pkt the input packet
457 * @param flush 1 if no further packets are available as input and all
458 * remaining packets should be output
459 * @return 1 if a packet was output, 0 if no packet could be output,
460 * < 0 if an error occurred
462 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
463 AVPacket *pkt, int flush);
465 void ff_free_stream(AVFormatContext *s, AVStream *st);
468 * Return the frame duration in seconds. Return 0 if not available.
470 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
471 AVCodecParserContext *pc, AVPacket *pkt);
473 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
475 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
478 * Select a PCM codec based on the given parameters.
480 * @param bps bits-per-sample
481 * @param flt floating-point
482 * @param be big-endian
483 * @param sflags signed flags. each bit corresponds to one byte of bit depth.
484 * e.g. the 1st bit indicates if 8-bit should be signed or
485 * unsigned, the 2nd bit indicates if 16-bit should be signed or
486 * unsigned, etc... This is useful for formats such as WAVE where
487 * only 8-bit is unsigned and all other bit depths are signed.
488 * @return a PCM codec id or AV_CODEC_ID_NONE
490 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
493 * Chooses a timebase for muxing the specified stream.
495 * The chosen timebase allows sample accurate timestamps based
496 * on the framerate or sample rate for audio streams. It also is
497 * at least as precise as 1/min_precision would be.
499 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
502 * Chooses a timebase for muxing the specified stream.
504 enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
507 * Generate standard extradata for AVC-Intra based on width/height and field
510 int ff_generate_avci_extradata(AVStream *st);
513 * Add a bitstream filter to a stream.
515 * @param st output stream to add a filter to
516 * @param name the name of the filter to add
517 * @param args filter-specific argument string
518 * @return >0 on success;
519 * AVERROR code on failure
521 int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
524 * Copy encoding parameters from source to destination stream
526 * @param dst pointer to destination AVStream
527 * @param src pointer to source AVStream
528 * @return >=0 on success, AVERROR code on error
530 int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
533 * Wrap errno on rename() error.
535 * @param oldpath source path
536 * @param newpath destination path
537 * @return 0 or AVERROR on failure
539 static inline int ff_rename(const char *oldpath, const char *newpath, void *logctx)
542 if (rename(oldpath, newpath) == -1) {
543 ret = AVERROR(errno);
545 char err[AV_ERROR_MAX_STRING_SIZE] = {0};
546 av_make_error_string(err, AV_ERROR_MAX_STRING_SIZE, ret);
547 av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", oldpath, newpath, err);
554 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
555 * which is always set to 0.
557 * @param size size of extradata
558 * @return 0 if OK, AVERROR_xxx on error
560 int ff_alloc_extradata(AVCodecParameters *par, int size);
563 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
564 * which is always set to 0 and fill it from pb.
566 * @param size size of extradata
567 * @return >= 0 if OK, AVERROR_xxx on error
569 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
572 * add frame for rfps calculation.
574 * @param dts timestamp of the i-th frame
575 * @return 0 if OK, AVERROR_xxx on error
577 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
579 void ff_rfps_calculate(AVFormatContext *ic);
582 * Flags for AVFormatContext.write_uncoded_frame()
584 enum AVWriteUncodedFrameFlags {
587 * Query whether the feature is possible on this stream.
588 * The frame argument is ignored.
590 AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
595 * Copies the whilelists from one context to the other
597 int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
599 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
600 const AVIOInterruptCB *int_cb, AVDictionary **options);
603 * Returned by demuxers to indicate that data was consumed but discarded
604 * (ignored streams or junk data). The framework will re-call the demuxer.
606 #define FFERROR_REDO FFERRTAG('R','E','D','O')
609 * Utility function to open IO stream of output format.
611 * @param s AVFormatContext
612 * @param url URL or file name to open for writing
613 * @options optional options which will be passed to io_open callback
614 * @return >=0 on success, negative AVERROR in case of failure
616 int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
619 * A wrapper around AVFormatContext.io_close that should be used
620 * instead of calling the pointer directly.
622 void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
625 * Utility function to check if the file uses http or https protocol
627 * @param s AVFormatContext
628 * @param filename URL or file name to open for writing
630 int ff_is_http_proto(char *filename);
633 * Parse creation_time in AVFormatContext metadata if exists and warn if the
636 * @param s AVFormatContext
637 * @param timestamp parsed timestamp in microseconds, only set on successful parsing
638 * @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
639 * @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
641 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
644 * Standardize creation_time metadata in AVFormatContext to an ISO-8601
647 * @param s AVFormatContext
648 * @return <0 on error
650 int ff_standardize_creation_time(AVFormatContext *s);
652 #define CONTAINS_PAL 2
654 * Reshuffles the lines to use the user specified stride.
656 * @param ppkt input and output packet
657 * @return negative error code or
658 * 0 if no new packet was allocated
659 * non-zero if a new packet was allocated and ppkt has to be freed
660 * CONTAINS_PAL if in addition to a new packet the old contained a palette
662 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
665 * Retrieves the palette from a packet, either from side data, or
666 * appended to the video data in the packet itself (raw video only).
667 * It is commonly used after a call to ff_reshuffle_raw_rgb().
669 * Use 0 for the ret parameter to check for side data only.
671 * @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
672 * @param ret return value from ff_reshuffle_raw_rgb(), or 0
673 * @param palette pointer to palette buffer
674 * @return negative error code or
675 * 1 if the packet has a palette, else 0
677 int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
680 * Finalize buf into extradata and set its size appropriately.
682 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
685 * Find the next packet in the interleaving queue for the given stream.
686 * The pkt parameter is filled in with the queued packet, including
687 * references to the data (which the caller is not allowed to keep or
690 * @return 0 if a packet was found, a negative value if no packet was found
692 int ff_interleaved_peek(AVFormatContext *s, int stream,
693 AVPacket *pkt, int add_offset);
696 int ff_lock_avformat(void);
697 int ff_unlock_avformat(void);
699 #endif /* AVFORMAT_INTERNAL_H */