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ffmpeg/libavformat/internal.h

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/*
* copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_INTERNAL_H
#define AVFORMAT_INTERNAL_H
#include <stdint.h>
#include "libavutil/bprint.h"
#include "avformat.h"
#include "os_support.h"
#define MAX_URL_SIZE 4096
/** size of probe buffer, for guessing file type from file contents */
#define PROBE_BUF_MIN 2048
#define PROBE_BUF_MAX (1 << 20)
#ifdef DEBUG
# define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
#else
# define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
#endif
typedef struct AVCodecTag {
enum AVCodecID id;
unsigned int tag;
} AVCodecTag;
typedef struct CodecMime{
char str[32];
enum AVCodecID id;
} CodecMime;
/*************************************************/
/* fractional numbers for exact pts handling */
/**
* The exact value of the fractional number is: 'val + num / den'.
* num is assumed to be 0 <= num < den.
*/
typedef struct FFFrac {
int64_t val, num, den;
} FFFrac;
struct AVFormatInternal {
/**
* Number of streams relevant for interleaving.
* Muxing only.
*/
int nb_interleaved_streams;
/**
* This buffer is only needed when packets were already buffered but
* not decoded, for example to get the codec parameters in MPEG
* streams.
*/
struct PacketList *packet_buffer;
struct PacketList *packet_buffer_end;
/* av_seek_frame() support */
int64_t data_offset; /**< offset of the first packet */
/**
* Raw packets from the demuxer, prior to parsing and decoding.
* This buffer is used for buffering packets until the codec can
* be identified, as parsing cannot be done without knowing the
* codec.
*/
struct PacketList *raw_packet_buffer;
struct PacketList *raw_packet_buffer_end;
/**
* Packets split by the parser get queued here.
*/
struct PacketList *parse_queue;
struct PacketList *parse_queue_end;
/**
* The generic code uses this as a temporary packet
* to parse packets; it may also be used for other means
* for short periods that are guaranteed not to overlap
* with calls to av_read_frame() (or ff_read_packet())
* or with each other.
* It may be used by demuxers as a replacement for
* stack packets (unless they call one of the aforementioned
* functions with their own AVFormatContext).
* Every user has to ensure that this packet is blank
* after using it.
*/
AVPacket *parse_pkt;
/**
* Used to hold temporary packets.
*/
AVPacket *pkt;
/**
* Remaining size available for raw_packet_buffer, in bytes.
*/
#define RAW_PACKET_BUFFER_SIZE 2500000
int raw_packet_buffer_remaining_size;
/**
* Offset to remap timestamps to be non-negative.
* Expressed in timebase units.
* @see AVStream.mux_ts_offset
*/
int64_t offset;
/**
* Timebase for the timestamp offset.
*/
AVRational offset_timebase;
#if FF_API_COMPUTE_PKT_FIELDS2
int missing_ts_warning;
#endif
int inject_global_side_data;
int avoid_negative_ts_use_pts;
/**
* Timestamp of the end of the shortest stream.
*/
int64_t shortest_end;
/**
* Whether or not avformat_init_output has already been called
*/
int initialized;
/**
* Whether or not avformat_init_output fully initialized streams
*/
int streams_initialized;
/**
* ID3v2 tag useful for MP3 demuxing
*/
AVDictionary *id3v2_meta;
/*
* Prefer the codec framerate for avg_frame_rate computation.
*/
int prefer_codec_framerate;
/**
* Set if chapter ids are strictly monotonic.
*/
int chapter_ids_monotonic;
};
struct AVStreamInternal {
/**
* Set to 1 if the codec allows reordering, so pts can be different
* from dts.
*/
int reorder;
/**
* bitstream filter to run on stream
* - encoding: Set by muxer using ff_stream_add_bitstream_filter
* - decoding: unused
*/
AVBSFContext *bsfc;
/**
* Whether or not check_bitstream should still be run on each packet
*/
int bitstream_checked;
/**
* The codec context used by avformat_find_stream_info, the parser, etc.
*/
AVCodecContext *avctx;
/**
* 1 if avctx has been initialized with the values from the codec parameters
*/
int avctx_inited;
enum AVCodecID orig_codec_id;
/* the context for extracting extradata in find_stream_info()
* inited=1/bsf=NULL signals that extracting is not possible (codec not
* supported) */
struct {
AVBSFContext *bsf;
int inited;
} extract_extradata;
/**
* Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
*/
int need_context_update;
int is_intra_only;
FFFrac *priv_pts;
#define MAX_STD_TIMEBASES (30*12+30+3+6)
/**
* Stream information used internally by avformat_find_stream_info()
*/
struct {
int64_t last_dts;
int64_t duration_gcd;
int duration_count;
int64_t rfps_duration_sum;
double (*duration_error)[2][MAX_STD_TIMEBASES];
int64_t codec_info_duration;
int64_t codec_info_duration_fields;
int frame_delay_evidence;
/**
* 0 -> decoder has not been searched for yet.
* >0 -> decoder found
* <0 -> decoder with codec_id == -found_decoder has not been found
*/
int found_decoder;
int64_t last_duration;
/**
* Those are used for average framerate estimation.
*/
int64_t fps_first_dts;
int fps_first_dts_idx;
int64_t fps_last_dts;
int fps_last_dts_idx;
} *info;
AVIndexEntry *index_entries; /**< Only used if the format does not
support seeking natively. */
int nb_index_entries;
unsigned int index_entries_allocated_size;
int64_t interleaver_chunk_size;
int64_t interleaver_chunk_duration;
/**
* stream probing state
* -1 -> probing finished
* 0 -> no probing requested
* rest -> perform probing with request_probe being the minimum score to accept.
*/
int request_probe;
/**
* Indicates that everything up to the next keyframe
* should be discarded.
*/
int skip_to_keyframe;
/**
* Number of samples to skip at the start of the frame decoded from the next packet.
*/
int skip_samples;
/**
* If not 0, the number of samples that should be skipped from the start of
* the stream (the samples are removed from packets with pts==0, which also
* assumes negative timestamps do not happen).
* Intended for use with formats such as mp3 with ad-hoc gapless audio
* support.
*/
int64_t start_skip_samples;
/**
* If not 0, the first audio sample that should be discarded from the stream.
* This is broken by design (needs global sample count), but can't be
* avoided for broken by design formats such as mp3 with ad-hoc gapless
* audio support.
*/
int64_t first_discard_sample;
/**
* The sample after last sample that is intended to be discarded after
* first_discard_sample. Works on frame boundaries only. Used to prevent
* early EOF if the gapless info is broken (considered concatenated mp3s).
*/
int64_t last_discard_sample;
/**
* Number of internally decoded frames, used internally in libavformat, do not access
* its lifetime differs from info which is why it is not in that structure.
*/
int nb_decoded_frames;
/**
* Timestamp offset added to timestamps before muxing
*/
int64_t mux_ts_offset;
/**
* Internal data to check for wrapping of the time stamp
*/
int64_t pts_wrap_reference;
/**
* Options for behavior, when a wrap is detected.
*
* Defined by AV_PTS_WRAP_ values.
*
* If correction is enabled, there are two possibilities:
* If the first time stamp is near the wrap point, the wrap offset
* will be subtracted, which will create negative time stamps.
* Otherwise the offset will be added.
*/
int pts_wrap_behavior;
/**
* Internal data to prevent doing update_initial_durations() twice
*/
int update_initial_durations_done;
#define MAX_REORDER_DELAY 16
/**
* Internal data to generate dts from pts
*/
int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
int64_t pts_buffer[MAX_REORDER_DELAY+1];
/**
* Internal data to analyze DTS and detect faulty mpeg streams
*/
int64_t last_dts_for_order_check;
uint8_t dts_ordered;
uint8_t dts_misordered;
/**
* Internal data to inject global side data
*/
int inject_global_side_data;
/**
* display aspect ratio (0 if unknown)
* - encoding: unused
* - decoding: Set by libavformat to calculate sample_aspect_ratio internally
*/
AVRational display_aspect_ratio;
AVProbeData probe_data;
/**
* last packet in packet_buffer for this stream when muxing.
*/
struct PacketList *last_in_packet_buffer;
};
#ifdef __GNUC__
#define dynarray_add(tab, nb_ptr, elem)\
do {\
__typeof__(tab) _tab = (tab);\
__typeof__(elem) _elem = (elem);\
(void)sizeof(**_tab == _elem); /* check that types are compatible */\
av_dynarray_add(_tab, nb_ptr, _elem);\
} while(0)
#else
#define dynarray_add(tab, nb_ptr, elem)\
do {\
av_dynarray_add((tab), nb_ptr, (elem));\
} while(0)
#endif
/**
* Automatically create sub-directories
*
* @param path will create sub-directories by path
* @return 0, or < 0 on error
*/
int ff_mkdir_p(const char *path);
char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
/**
* Parse a string of hexadecimal strings. Any space between the hexadecimal
* digits is ignored.
*
* @param data if non-null, the parsed data is written to this pointer
* @param p the string to parse
* @return the number of bytes written (or to be written, if data is null)
*/
int ff_hex_to_data(uint8_t *data, const char *p);
/**
* Add packet to an AVFormatContext's packet_buffer list, determining its
* interleaved position using compare() function argument.
* @return 0 on success, < 0 on error. pkt will always be blank on return.
*/
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
void ff_read_frame_flush(AVFormatContext *s);
#define NTP_OFFSET 2208988800ULL
#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
/** Get the current time since NTP epoch in microseconds. */
uint64_t ff_ntp_time(void);
/**
* Get the NTP time stamp formatted as per the RFC-5905.
*
* @param ntp_time NTP time in micro seconds (since NTP epoch)
* @return the formatted NTP time stamp
*/
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
/**
* Parse the NTP time in micro seconds (since NTP epoch).
*
* @param ntp_ts NTP time stamp formatted as per the RFC-5905.
* @return the time in micro seconds (since NTP epoch)
*/
uint64_t ff_parse_ntp_time(uint64_t ntp_ts);
/**
* Append the media-specific SDP fragment for the media stream c
* to the buffer buff.
*
* Note, the buffer needs to be initialized, since it is appended to
* existing content.
*
* @param buff the buffer to append the SDP fragment to
* @param size the size of the buff buffer
* @param st the AVStream of the media to describe
* @param idx the global stream index
* @param dest_addr the destination address of the media stream, may be NULL
* @param dest_type the destination address type, may be NULL
* @param port the destination port of the media stream, 0 if unknown
* @param ttl the time to live of the stream, 0 if not multicast
* @param fmt the AVFormatContext, which might contain options modifying
* the generated SDP
*/
void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
const char *dest_addr, const char *dest_type,
int port, int ttl, AVFormatContext *fmt);
/**
* Write a packet to another muxer than the one the user originally
* intended. Useful when chaining muxers, where one muxer internally
* writes a received packet to another muxer.
*
* @param dst the muxer to write the packet to
* @param dst_stream the stream index within dst to write the packet to
* @param pkt the packet to be written
* @param src the muxer the packet originally was intended for
* @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
* @return the value av_write_frame returned
*/
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
AVFormatContext *src, int interleave);
/**
* Read a whole line of text from AVIOContext. Stop reading after reaching
* either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
* and may be truncated if the buffer is too small.
*
* @param s the read-only AVIOContext
* @param buf buffer to store the read line
* @param maxlen size of the buffer
* @return the length of the string written in the buffer, not including the
* final \\0
*/
int ff_get_line(AVIOContext *s, char *buf, int maxlen);
/**
* Same as ff_get_line but strip the white-space characters in the text tail
*
* @param s the read-only AVIOContext
* @param buf buffer to store the read line
* @param maxlen size of the buffer
* @return the length of the string written in the buffer
*/
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
/**
* Read a whole line of text from AVIOContext to an AVBPrint buffer. Stop
* reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or EOF. The line
* ending characters are NOT included in the buffer, but they are skipped on
* the input.
*
* @param s the read-only AVIOContext
* @param bp the AVBPrint buffer
* @return the length of the read line, not including the line endings,
* negative on error.
*/
int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);
/**
* Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting
* its contents. Stop reading after reaching a \\r, a \\n, a \\r\\n, a \\0 or
* EOF. The line ending characters are NOT included in the buffer, but they
* are skipped on the input.
*
* @param s the read-only AVIOContext
* @param bp the AVBPrint buffer
* @return the length of the read line not including the line endings,
* negative on error, or if the buffer becomes truncated.
*/
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);
#define SPACE_CHARS " \t\r\n"
/**
* Callback function type for ff_parse_key_value.
*
* @param key a pointer to the key
* @param key_len the number of bytes that belong to the key, including the '='
* char
* @param dest return the destination pointer for the value in *dest, may
* be null to ignore the value
* @param dest_len the length of the *dest buffer
*/
typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
int key_len, char **dest, int *dest_len);
/**
* Parse a string with comma-separated key=value pairs. The value strings
* may be quoted and may contain escaped characters within quoted strings.
*
* @param str the string to parse
* @param callback_get_buf function that returns where to store the
* unescaped value string.
* @param context the opaque context pointer to pass to callback_get_buf
*/
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
void *context);
/**
* Find stream index based on format-specific stream ID
* @return stream index, or < 0 on error
*/
int ff_find_stream_index(AVFormatContext *s, int id);
/**
* Internal version of av_index_search_timestamp
*/
int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
int64_t wanted_timestamp, int flags);
/**
* Internal version of av_add_index_entry
*/
int ff_add_index_entry(AVIndexEntry **index_entries,
int *nb_index_entries,
unsigned int *index_entries_allocated_size,
int64_t pos, int64_t timestamp, int size, int distance, int flags);
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
/**
* Add a new chapter.
*
* @param s media file handle
* @param id unique ID for this chapter
* @param start chapter start time in time_base units
* @param end chapter end time in time_base units
* @param title chapter title
*
* @return AVChapter or NULL on error
*/
#if FF_API_CHAPTER_ID_INT
AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
#else
AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
#endif
int64_t start, int64_t end, const char *title);
/**
* Ensure the index uses less memory than the maximum specified in
* AVFormatContext.max_index_size by discarding entries if it grows
* too large.
*/
void ff_reduce_index(AVFormatContext *s, int stream_index);
enum AVCodecID ff_guess_image2_codec(const char *filename);
/**
* Perform a binary search using av_index_search_timestamp() and
* AVInputFormat.read_timestamp().
*
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*/
int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
int64_t target_ts, int flags);
/**
* Update cur_dts of all streams based on the given timestamp and AVStream.
*
* Stream ref_st unchanged, others set cur_dts in their native time base.
* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
* @param timestamp new dts expressed in time_base of param ref_st
* @param ref_st reference stream giving time_base of param timestamp
*/
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
/**
* Perform a binary search using read_timestamp().
*
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*/
int64_t ff_gen_search(AVFormatContext *s, int stream_index,
int64_t target_ts, int64_t pos_min,
int64_t pos_max, int64_t pos_limit,
int64_t ts_min, int64_t ts_max,
int flags, int64_t *ts_ret,
int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
/**
* Set the time base and wrapping info for a given stream. This will be used
* to interpret the stream's timestamps. If the new time base is invalid
* (numerator or denominator are non-positive), it leaves the stream
* unchanged.
*
* @param s stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control)
* @param pts_num time base numerator
* @param pts_den time base denominator
*/
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den);
/**
* Add side data to a packet for changing parameters to the given values.
* Parameters set to 0 aren't included in the change.
*/
int ff_add_param_change(AVPacket *pkt, int32_t channels,
uint64_t channel_layout, int32_t sample_rate,
int32_t width, int32_t height);
/**
* Set the timebase for each stream from the corresponding codec timebase and
* print it.
*/
int ff_framehash_write_header(AVFormatContext *s);
/**
* Read a transport packet from a media file.
*
* @param s media file handle
* @param pkt is filled
* @return 0 if OK, AVERROR_xxx on error
*/
int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
/**
* Add an attached pic to an AVStream.
*
* @param st if set, the stream to add the attached pic to;
* if unset, a new stream will be added to s.
* @param pb AVIOContext to read data from if buf is unset.
* @param buf if set, it contains the data and size information to be used
* for the attached pic; if unset, data is read from pb.
* @param size the size of the data to read if buf is unset.
*
* @return 0 on success, < 0 on error. On error, this function removes
* the stream it has added (if any).
*/
int ff_add_attached_pic(AVFormatContext *s, AVStream *st, AVIOContext *pb,
AVBufferRef **buf, int size);
/**
* Interleave an AVPacket per dts so it can be muxed.
*
* @param s an AVFormatContext for output. pkt resp. out will be added to
* resp. taken from its packet buffer.
* @param out the interleaved packet will be output here
* @param pkt the input packet; will be blank on return if not NULL
* @param flush 1 if no further packets are available as input and all
* remaining packets should be output
* @return 1 if a packet was output, 0 if no packet could be output
* (in which case out may be uninitialized), < 0 if an error occurred
*/
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
AVPacket *pkt, int flush);
void ff_free_stream(AVFormatContext *s, AVStream *st);
/**
* Return the frame duration in seconds. Return 0 if not available.
*/
void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt);
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
int ff_is_intra_only(enum AVCodecID id);
/**
* Select a PCM codec based on the given parameters.
*
* @param bps bits-per-sample
* @param flt floating-point
* @param be big-endian
* @param sflags signed flags. each bit corresponds to one byte of bit depth.
* e.g. the 1st bit indicates if 8-bit should be signed or
* unsigned, the 2nd bit indicates if 16-bit should be signed or
* unsigned, etc... This is useful for formats such as WAVE where
* only 8-bit is unsigned and all other bit depths are signed.
* @return a PCM codec id or AV_CODEC_ID_NONE
*/
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
/**
* Chooses a timebase for muxing the specified stream.
*
* The chosen timebase allows sample accurate timestamps based
* on the framerate or sample rate for audio streams. It also is
* at least as precise as 1/min_precision would be.
*/
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);
/**
* Chooses a timebase for muxing the specified stream.
*/
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);
/**
* Generate standard extradata for AVC-Intra based on width/height and field
* order.
*/
int ff_generate_avci_extradata(AVStream *st);
/**
* Add a bitstream filter to a stream.
*
* @param st output stream to add a filter to
* @param name the name of the filter to add
* @param args filter-specific argument string
* @return >0 on success;
* AVERROR code on failure
*/
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
/**
* Copy encoding parameters from source to destination stream
*
* @param dst pointer to destination AVStream
* @param src pointer to source AVStream
* @return >=0 on success, AVERROR code on error
*/
int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
/**
* Wrap avpriv_io_move and log if error happens.
*
* @param url_src source path
* @param url_dst destination path
* @return 0 or AVERROR on failure
*/
int ff_rename(const char *url_src, const char *url_dst, void *logctx);
/**
* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
* which is always set to 0.
*
* Previously allocated extradata in par will be freed.
*
* @param size size of extradata
* @return 0 if OK, AVERROR_xxx on error
*/
int ff_alloc_extradata(AVCodecParameters *par, int size);
/**
* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
* which is always set to 0 and fill it from pb.
*
* @param size size of extradata
* @return >= 0 if OK, AVERROR_xxx on error
*/
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);
/**
* add frame for rfps calculation.
*
* @param dts timestamp of the i-th frame
* @return 0 if OK, AVERROR_xxx on error
*/
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
void ff_rfps_calculate(AVFormatContext *ic);
/**
* Flags for AVFormatContext.write_uncoded_frame()
*/
enum AVWriteUncodedFrameFlags {
/**
* Query whether the feature is possible on this stream.
* The frame argument is ignored.
*/
AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
};
/**
* Copies the whilelists from one context to the other
*/
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
/**
* Returned by demuxers to indicate that data was consumed but discarded
* (ignored streams or junk data). The framework will re-call the demuxer.
*/
#define FFERROR_REDO FFERRTAG('R','E','D','O')
/**
* Utility function to open IO stream of output format.
*
* @param s AVFormatContext
* @param url URL or file name to open for writing
* @options optional options which will be passed to io_open callback
* @return >=0 on success, negative AVERROR in case of failure
*/
int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
/*
* A wrapper around AVFormatContext.io_close that should be used
* instead of calling the pointer directly.
*/
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
/**
* Utility function to check if the file uses http or https protocol
*
* @param s AVFormatContext
* @param filename URL or file name to open for writing
*/
int ff_is_http_proto(char *filename);
/**
* Parse creation_time in AVFormatContext metadata if exists and warn if the
* parsing fails.
*
* @param s AVFormatContext
* @param timestamp parsed timestamp in microseconds, only set on successful parsing
* @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
* @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
*/
int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
/**
* Standardize creation_time metadata in AVFormatContext to an ISO-8601
* timestamp string.
*
* @param s AVFormatContext
* @return <0 on error
*/
int ff_standardize_creation_time(AVFormatContext *s);
#define CONTAINS_PAL 2
/**
* Reshuffles the lines to use the user specified stride.
*
* @param ppkt input and output packet
* @return negative error code or
* 0 if no new packet was allocated
* non-zero if a new packet was allocated and ppkt has to be freed
* CONTAINS_PAL if in addition to a new packet the old contained a palette
*/
int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);
/**
* Retrieves the palette from a packet, either from side data, or
* appended to the video data in the packet itself (raw video only).
* It is commonly used after a call to ff_reshuffle_raw_rgb().
*
* Use 0 for the ret parameter to check for side data only.
*
* @param pkt pointer to packet before calling ff_reshuffle_raw_rgb()
* @param ret return value from ff_reshuffle_raw_rgb(), or 0
* @param palette pointer to palette buffer
* @return negative error code or
* 1 if the packet has a palette, else 0
*/
int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);
/**
* Finalize buf into extradata and set its size appropriately.
*/
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
/**
* Find the next packet in the interleaving queue for the given stream.
*
* @return a pointer to a packet if one was found, NULL otherwise.
*/
const AVPacket *ff_interleaved_peek(AVFormatContext *s, int stream);
int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset);
int ff_lock_avformat(void);
int ff_unlock_avformat(void);
/**
* Set AVFormatContext url field to the provided pointer. The pointer must
* point to a valid string. The existing url field is freed if necessary. Also
* set the legacy filename field to the same string which was provided in url.
*/
void ff_format_set_url(AVFormatContext *s, char *url);
void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
#endif /* AVFORMAT_INTERNAL_H */
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