+++ /dev/null
-/*
- * 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_AVFORMAT_H
-#define AVFORMAT_AVFORMAT_H
-
-/**
- * @file
- * @ingroup libavf
- * Main libavformat public API header
- */
-
-/**
- * @defgroup libavf I/O and Muxing/Demuxing Library
- * @{
- *
- * Libavformat (lavf) is a library for dealing with various media container
- * formats. Its main two purposes are demuxing - i.e. splitting a media file
- * into component streams, and the reverse process of muxing - writing supplied
- * data in a specified container format. It also has an @ref lavf_io
- * "I/O module" which supports a number of protocols for accessing the data (e.g.
- * file, tcp, http and others). Before using lavf, you need to call
- * av_register_all() to register all compiled muxers, demuxers and protocols.
- * Unless you are absolutely sure you won't use libavformat's network
- * capabilities, you should also call avformat_network_init().
- *
- * A supported input format is described by an AVInputFormat struct, conversely
- * an output format is described by AVOutputFormat. You can iterate over all
- * registered input/output formats using the av_iformat_next() /
- * av_oformat_next() functions. The protocols layer is not part of the public
- * API, so you can only get the names of supported protocols with the
- * avio_enum_protocols() function.
- *
- * Main lavf structure used for both muxing and demuxing is AVFormatContext,
- * which exports all information about the file being read or written. As with
- * most Libavformat structures, its size is not part of public ABI, so it cannot be
- * allocated on stack or directly with av_malloc(). To create an
- * AVFormatContext, use avformat_alloc_context() (some functions, like
- * avformat_open_input() might do that for you).
- *
- * Most importantly an AVFormatContext contains:
- * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
- * "output" format. It is either autodetected or set by user for input;
- * always set by user for output.
- * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
- * elementary streams stored in the file. AVStreams are typically referred to
- * using their index in this array.
- * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
- * set by user for input, always set by user for output (unless you are dealing
- * with an AVFMT_NOFILE format).
- *
- * @section lavf_options Passing options to (de)muxers
- * It is possible to configure lavf muxers and demuxers using the @ref avoptions
- * mechanism. Generic (format-independent) libavformat options are provided by
- * AVFormatContext, they can be examined from a user program by calling
- * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
- * from avformat_get_class()). Private (format-specific) options are provided by
- * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
- * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
- * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
- * if its AVClass is non-NULL, and the protocols layer. See the discussion on
- * nesting in @ref avoptions documentation to learn how to access those.
- *
- * @section urls
- * URL strings in libavformat are made of a scheme/protocol, a ':', and a
- * scheme specific string. URLs without a scheme and ':' used for local files
- * are supported but deprecated. "file:" should be used for local files.
- *
- * It is important that the scheme string is not taken from untrusted
- * sources without checks.
- *
- * Note that some schemes/protocols are quite powerful, allowing access to
- * both local and remote files, parts of them, concatenations of them, local
- * audio and video devices and so on.
- *
- * @defgroup lavf_decoding Demuxing
- * @{
- * Demuxers read a media file and split it into chunks of data (@em packets). A
- * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
- * single elementary stream. In the lavf API this process is represented by the
- * avformat_open_input() function for opening a file, av_read_frame() for
- * reading a single packet and finally avformat_close_input(), which does the
- * cleanup.
- *
- * @section lavf_decoding_open Opening a media file
- * The minimum information required to open a file is its URL, which
- * is passed to avformat_open_input(), as in the following code:
- * @code
- * const char *url = "file:in.mp3";
- * AVFormatContext *s = NULL;
- * int ret = avformat_open_input(&s, url, NULL, NULL);
- * if (ret < 0)
- * abort();
- * @endcode
- * The above code attempts to allocate an AVFormatContext, open the
- * specified file (autodetecting the format) and read the header, exporting the
- * information stored there into s. Some formats do not have a header or do not
- * store enough information there, so it is recommended that you call the
- * avformat_find_stream_info() function which tries to read and decode a few
- * frames to find missing information.
- *
- * In some cases you might want to preallocate an AVFormatContext yourself with
- * avformat_alloc_context() and do some tweaking on it before passing it to
- * avformat_open_input(). One such case is when you want to use custom functions
- * for reading input data instead of lavf internal I/O layer.
- * To do that, create your own AVIOContext with avio_alloc_context(), passing
- * your reading callbacks to it. Then set the @em pb field of your
- * AVFormatContext to newly created AVIOContext.
- *
- * Since the format of the opened file is in general not known until after
- * avformat_open_input() has returned, it is not possible to set demuxer private
- * options on a preallocated context. Instead, the options should be passed to
- * avformat_open_input() wrapped in an AVDictionary:
- * @code
- * AVDictionary *options = NULL;
- * av_dict_set(&options, "video_size", "640x480", 0);
- * av_dict_set(&options, "pixel_format", "rgb24", 0);
- *
- * if (avformat_open_input(&s, url, NULL, &options) < 0)
- * abort();
- * av_dict_free(&options);
- * @endcode
- * This code passes the private options 'video_size' and 'pixel_format' to the
- * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
- * cannot know how to interpret raw video data otherwise. If the format turns
- * out to be something different than raw video, those options will not be
- * recognized by the demuxer and therefore will not be applied. Such unrecognized
- * options are then returned in the options dictionary (recognized options are
- * consumed). The calling program can handle such unrecognized options as it
- * wishes, e.g.
- * @code
- * AVDictionaryEntry *e;
- * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
- * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
- * abort();
- * }
- * @endcode
- *
- * After you have finished reading the file, you must close it with
- * avformat_close_input(). It will free everything associated with the file.
- *
- * @section lavf_decoding_read Reading from an opened file
- * Reading data from an opened AVFormatContext is done by repeatedly calling
- * av_read_frame() on it. Each call, if successful, will return an AVPacket
- * containing encoded data for one AVStream, identified by
- * AVPacket.stream_index. This packet may be passed straight into the libavcodec
- * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
- * avcodec_decode_subtitle2() if the caller wishes to decode the data.
- *
- * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
- * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
- * pts/dts, 0 for duration) if the stream does not provide them. The timing
- * information will be in AVStream.time_base units, i.e. it has to be
- * multiplied by the timebase to convert them to seconds.
- *
- * If AVPacket.buf is set on the returned packet, then the packet is
- * allocated dynamically and the user may keep it indefinitely.
- * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
- * static storage somewhere inside the demuxer and the packet is only valid
- * until the next av_read_frame() call or closing the file. If the caller
- * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
- * of it.
- * In both cases, the packet must be freed with av_packet_unref() when it is no
- * longer needed.
- *
- * @section lavf_decoding_seek Seeking
- * @}
- *
- * @defgroup lavf_encoding Muxing
- * @{
- * Muxers take encoded data in the form of @ref AVPacket "AVPackets" and write
- * it into files or other output bytestreams in the specified container format.
- *
- * The main API functions for muxing are avformat_write_header() for writing the
- * file header, av_write_frame() / av_interleaved_write_frame() for writing the
- * packets and av_write_trailer() for finalizing the file.
- *
- * At the beginning of the muxing process, the caller must first call
- * avformat_alloc_context() to create a muxing context. The caller then sets up
- * the muxer by filling the various fields in this context:
- *
- * - The @ref AVFormatContext.oformat "oformat" field must be set to select the
- * muxer that will be used.
- * - Unless the format is of the AVFMT_NOFILE type, the @ref AVFormatContext.pb
- * "pb" field must be set to an opened IO context, either returned from
- * avio_open2() or a custom one.
- * - Unless the format is of the AVFMT_NOSTREAMS type, at least one stream must
- * be created with the avformat_new_stream() function. The caller should fill
- * the @ref AVStream.codec "stream codec context" information, such as the
- * codec @ref AVCodecContext.codec_type "type", @ref AVCodecContext.codec_id
- * "id" and other parameters (e.g. width / height, the pixel or sample format,
- * etc.) as known. The @ref AVStream.time_base "stream timebase" should
- * be set to the timebase that the caller desires to use for this stream (note
- * that the timebase actually used by the muxer can be different, as will be
- * described later).
- * - It is advised to manually initialize only the relevant fields in
- * AVCodecContext, rather than using @ref avcodec_copy_context() during
- * remuxing: there is no guarantee that the codec context values remain valid
- * for both input and output format contexts.
- * - The caller may fill in additional information, such as @ref
- * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream"
- * metadata, @ref AVFormatContext.chapters "chapters", @ref
- * AVFormatContext.programs "programs", etc. as described in the
- * AVFormatContext documentation. Whether such information will actually be
- * stored in the output depends on what the container format and the muxer
- * support.
- *
- * When the muxing context is fully set up, the caller must call
- * avformat_write_header() to initialize the muxer internals and write the file
- * header. Whether anything actually is written to the IO context at this step
- * depends on the muxer, but this function must always be called. Any muxer
- * private options must be passed in the options parameter to this function.
- *
- * The data is then sent to the muxer by repeatedly calling av_write_frame() or
- * av_interleaved_write_frame() (consult those functions' documentation for
- * discussion on the difference between them; only one of them may be used with
- * a single muxing context, they should not be mixed). Do note that the timing
- * information on the packets sent to the muxer must be in the corresponding
- * AVStream's timebase. That timebase is set by the muxer (in the
- * avformat_write_header() step) and may be different from the timebase
- * requested by the caller.
- *
- * Once all the data has been written, the caller must call av_write_trailer()
- * to flush any buffered packets and finalize the output file, then close the IO
- * context (if any) and finally free the muxing context with
- * avformat_free_context().
- * @}
- *
- * @defgroup lavf_io I/O Read/Write
- * @{
- * @section lavf_io_dirlist Directory listing
- * The directory listing API makes it possible to list files on remote servers.
- *
- * Some of possible use cases:
- * - an "open file" dialog to choose files from a remote location,
- * - a recursive media finder providing a player with an ability to play all
- * files from a given directory.
- *
- * @subsection lavf_io_dirlist_open Opening a directory
- * At first, a directory needs to be opened by calling avio_open_dir()
- * supplied with a URL and, optionally, ::AVDictionary containing
- * protocol-specific parameters. The function returns zero or positive
- * integer and allocates AVIODirContext on success.
- *
- * @code
- * AVIODirContext *ctx = NULL;
- * if (avio_open_dir(&ctx, "smb://example.com/some_dir", NULL) < 0) {
- * fprintf(stderr, "Cannot open directory.\n");
- * abort();
- * }
- * @endcode
- *
- * This code tries to open a sample directory using smb protocol without
- * any additional parameters.
- *
- * @subsection lavf_io_dirlist_read Reading entries
- * Each directory's entry (i.e. file, another directory, anything else
- * within ::AVIODirEntryType) is represented by AVIODirEntry.
- * Reading consecutive entries from an opened AVIODirContext is done by
- * repeatedly calling avio_read_dir() on it. Each call returns zero or
- * positive integer if successful. Reading can be stopped right after the
- * NULL entry has been read -- it means there are no entries left to be
- * read. The following code reads all entries from a directory associated
- * with ctx and prints their names to standard output.
- * @code
- * AVIODirEntry *entry = NULL;
- * for (;;) {
- * if (avio_read_dir(ctx, &entry) < 0) {
- * fprintf(stderr, "Cannot list directory.\n");
- * abort();
- * }
- * if (!entry)
- * break;
- * printf("%s\n", entry->name);
- * avio_free_directory_entry(&entry);
- * }
- * @endcode
- * @}
- *
- * @defgroup lavf_codec Demuxers
- * @{
- * @defgroup lavf_codec_native Native Demuxers
- * @{
- * @}
- * @defgroup lavf_codec_wrappers External library wrappers
- * @{
- * @}
- * @}
- * @defgroup lavf_protos I/O Protocols
- * @{
- * @}
- * @defgroup lavf_internal Internal
- * @{
- * @}
- * @}
- *
- */
-
-#include <time.h>
-#include <stdio.h> /* FILE */
-#include "libavcodec/avcodec.h"
-#include "libavutil/dict.h"
-#include "libavutil/log.h"
-
-#include "avio.h"
-#include "libavformat/version.h"
-
-struct AVFormatContext;
-
-struct AVDeviceInfoList;
-struct AVDeviceCapabilitiesQuery;
-
-/**
- * @defgroup metadata_api Public Metadata API
- * @{
- * @ingroup libavf
- * The metadata API allows libavformat to export metadata tags to a client
- * application when demuxing. Conversely it allows a client application to
- * set metadata when muxing.
- *
- * Metadata is exported or set as pairs of key/value strings in the 'metadata'
- * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
- * using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
- * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
- * exported by demuxers isn't checked to be valid UTF-8 in most cases.
- *
- * Important concepts to keep in mind:
- * - Keys are unique; there can never be 2 tags with the same key. This is
- * also meant semantically, i.e., a demuxer should not knowingly produce
- * several keys that are literally different but semantically identical.
- * E.g., key=Author5, key=Author6. In this example, all authors must be
- * placed in the same tag.
- * - Metadata is flat, not hierarchical; there are no subtags. If you
- * want to store, e.g., the email address of the child of producer Alice
- * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
- * - Several modifiers can be applied to the tag name. This is done by
- * appending a dash character ('-') and the modifier name in the order
- * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
- * - language -- a tag whose value is localized for a particular language
- * is appended with the ISO 639-2/B 3-letter language code.
- * For example: Author-ger=Michael, Author-eng=Mike
- * The original/default language is in the unqualified "Author" tag.
- * A demuxer should set a default if it sets any translated tag.
- * - sorting -- a modified version of a tag that should be used for
- * sorting will have '-sort' appended. E.g. artist="The Beatles",
- * artist-sort="Beatles, The".
- * - Some protocols and demuxers support metadata updates. After a successful
- * call to av_read_packet(), AVFormatContext.event_flags or AVStream.event_flags
- * will be updated to indicate if metadata changed. In order to detect metadata
- * changes on a stream, you need to loop through all streams in the AVFormatContext
- * and check their individual event_flags.
- *
- * - Demuxers attempt to export metadata in a generic format, however tags
- * with no generic equivalents are left as they are stored in the container.
- * Follows a list of generic tag names:
- *
- @verbatim
- album -- name of the set this work belongs to
- album_artist -- main creator of the set/album, if different from artist.
- e.g. "Various Artists" for compilation albums.
- artist -- main creator of the work
- comment -- any additional description of the file.
- composer -- who composed the work, if different from artist.
- copyright -- name of copyright holder.
- creation_time-- date when the file was created, preferably in ISO 8601.
- date -- date when the work was created, preferably in ISO 8601.
- disc -- number of a subset, e.g. disc in a multi-disc collection.
- encoder -- name/settings of the software/hardware that produced the file.
- encoded_by -- person/group who created the file.
- filename -- original name of the file.
- genre -- <self-evident>.
- language -- main language in which the work is performed, preferably
- in ISO 639-2 format. Multiple languages can be specified by
- separating them with commas.
- performer -- artist who performed the work, if different from artist.
- E.g for "Also sprach Zarathustra", artist would be "Richard
- Strauss" and performer "London Philharmonic Orchestra".
- publisher -- name of the label/publisher.
- service_name -- name of the service in broadcasting (channel name).
- service_provider -- name of the service provider in broadcasting.
- title -- name of the work.
- track -- number of this work in the set, can be in form current/total.
- variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
- @endverbatim
- *
- * Look in the examples section for an application example how to use the Metadata API.
- *
- * @}
- */
-
-/* packet functions */
-
-
-/**
- * Allocate and read the payload of a packet and initialize its
- * fields with default values.
- *
- * @param s associated IO context
- * @param pkt packet
- * @param size desired payload size
- * @return >0 (read size) if OK, AVERROR_xxx otherwise
- */
-int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
-
-
-/**
- * Read data and append it to the current content of the AVPacket.
- * If pkt->size is 0 this is identical to av_get_packet.
- * Note that this uses av_grow_packet and thus involves a realloc
- * which is inefficient. Thus this function should only be used
- * when there is no reasonable way to know (an upper bound of)
- * the final size.
- *
- * @param s associated IO context
- * @param pkt packet
- * @param size amount of data to read
- * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
- * will not be lost even if an error occurs.
- */
-int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
-
-#if FF_API_LAVF_FRAC
-/*************************************************/
-/* 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 AVFrac {
- int64_t val, num, den;
-} AVFrac;
-#endif
-
-/*************************************************/
-/* input/output formats */
-
-struct AVCodecTag;
-
-/**
- * This structure contains the data a format has to probe a file.
- */
-typedef struct AVProbeData {
- const char *filename;
- unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
- int buf_size; /**< Size of buf except extra allocated bytes */
- const char *mime_type; /**< mime_type, when known. */
-} AVProbeData;
-
-#define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
-#define AVPROBE_SCORE_STREAM_RETRY (AVPROBE_SCORE_MAX/4-1)
-
-#define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
-#define AVPROBE_SCORE_MIME 75 ///< score for file mime type
-#define AVPROBE_SCORE_MAX 100 ///< maximum score
-
-#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
-
-/// Demuxer will use avio_open, no opened file should be provided by the caller.
-#define AVFMT_NOFILE 0x0001
-#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
-#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
-#if FF_API_LAVF_FMT_RAWPICTURE
-#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
- raw picture data. @deprecated Not used anymore */
-#endif
-#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
-#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
-#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
-#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
-#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
-#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
-#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
-#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
-#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
-#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
-#define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
-#define AVFMT_TS_NONSTRICT 0x20000 /**< Format does not require strictly
- increasing timestamps, but they must
- still be monotonic */
-#define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
- timestamps. If not set the timestamp
- will be shifted in av_write_frame and
- av_interleaved_write_frame so they
- start from 0.
- The user or muxer can override this through
- AVFormatContext.avoid_negative_ts
- */
-
-#define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
-
-/**
- * @addtogroup lavf_encoding
- * @{
- */
-typedef struct AVOutputFormat {
- const char *name;
- /**
- * Descriptive name for the format, meant to be more human-readable
- * than name. You should use the NULL_IF_CONFIG_SMALL() macro
- * to define it.
- */
- const char *long_name;
- const char *mime_type;
- const char *extensions; /**< comma-separated filename extensions */
- /* output support */
- enum AVCodecID audio_codec; /**< default audio codec */
- enum AVCodecID video_codec; /**< default video codec */
- enum AVCodecID subtitle_codec; /**< default subtitle codec */
- /**
- * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER,
- * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
- * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
- * AVFMT_TS_NONSTRICT
- */
- int flags;
-
- /**
- * List of supported codec_id-codec_tag pairs, ordered by "better
- * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
- */
- const struct AVCodecTag * const *codec_tag;
-
-
- const AVClass *priv_class; ///< AVClass for the private context
-
- /*****************************************************************
- * No fields below this line are part of the public API. They
- * may not be used outside of libavformat and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
- struct AVOutputFormat *next;
- /**
- * size of private data so that it can be allocated in the wrapper
- */
- int priv_data_size;
-
- int (*write_header)(struct AVFormatContext *);
- /**
- * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
- * pkt can be NULL in order to flush data buffered in the muxer.
- * When flushing, return 0 if there still is more data to flush,
- * or 1 if everything was flushed and there is no more buffered
- * data.
- */
- int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
- int (*write_trailer)(struct AVFormatContext *);
- /**
- * Currently only used to set pixel format if not YUV420P.
- */
- int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
- AVPacket *in, int flush);
- /**
- * Test if the given codec can be stored in this container.
- *
- * @return 1 if the codec is supported, 0 if it is not.
- * A negative number if unknown.
- * MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
- */
- int (*query_codec)(enum AVCodecID id, int std_compliance);
-
- void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
- int64_t *dts, int64_t *wall);
- /**
- * Allows sending messages from application to device.
- */
- int (*control_message)(struct AVFormatContext *s, int type,
- void *data, size_t data_size);
-
- /**
- * Write an uncoded AVFrame.
- *
- * See av_write_uncoded_frame() for details.
- *
- * The library will free *frame afterwards, but the muxer can prevent it
- * by setting the pointer to NULL.
- */
- int (*write_uncoded_frame)(struct AVFormatContext *, int stream_index,
- AVFrame **frame, unsigned flags);
- /**
- * Returns device list with it properties.
- * @see avdevice_list_devices() for more details.
- */
- int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
- /**
- * Initialize device capabilities submodule.
- * @see avdevice_capabilities_create() for more details.
- */
- int (*create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps);
- /**
- * Free device capabilities submodule.
- * @see avdevice_capabilities_free() for more details.
- */
- int (*free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps);
- enum AVCodecID data_codec; /**< default data codec */
- /**
- * Initialize format. May allocate data here, and set any AVFormatContext or
- * AVStream parameters that need to be set before packets are sent.
- * This method must not write output.
- *
- * Any allocations made here must be freed in deinit().
- */
- int (*init)(struct AVFormatContext *);
- /**
- * Deinitialize format. If present, this is called whenever the muxer is being
- * destroyed, regardless of whether or not the header has been written.
- *
- * If a trailer is being written, this is called after write_trailer().
- *
- * This is called if init() fails as well.
- */
- void (*deinit)(struct AVFormatContext *);
- /**
- * Set up any necessary bitstream filtering and extract any extra data needed
- * for the global header.
- * Return 0 if more packets from this stream must be checked; 1 if not.
- */
- int (*check_bitstream)(struct AVFormatContext *, const AVPacket *pkt);
-} AVOutputFormat;
-/**
- * @}
- */
-
-/**
- * @addtogroup lavf_decoding
- * @{
- */
-typedef struct AVInputFormat {
- /**
- * A comma separated list of short names for the format. New names
- * may be appended with a minor bump.
- */
- const char *name;
-
- /**
- * Descriptive name for the format, meant to be more human-readable
- * than name. You should use the NULL_IF_CONFIG_SMALL() macro
- * to define it.
- */
- const char *long_name;
-
- /**
- * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
- * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
- * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
- */
- int flags;
-
- /**
- * If extensions are defined, then no probe is done. You should
- * usually not use extension format guessing because it is not
- * reliable enough
- */
- const char *extensions;
-
- const struct AVCodecTag * const *codec_tag;
-
- const AVClass *priv_class; ///< AVClass for the private context
-
- /**
- * Comma-separated list of mime types.
- * It is used check for matching mime types while probing.
- * @see av_probe_input_format2
- */
- const char *mime_type;
-
- /*****************************************************************
- * No fields below this line are part of the public API. They
- * may not be used outside of libavformat and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
- struct AVInputFormat *next;
-
- /**
- * Raw demuxers store their codec ID here.
- */
- int raw_codec_id;
-
- /**
- * Size of private data so that it can be allocated in the wrapper.
- */
- int priv_data_size;
-
- /**
- * Tell if a given file has a chance of being parsed as this format.
- * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
- * big so you do not have to check for that unless you need more.
- */
- int (*read_probe)(AVProbeData *);
-
- /**
- * Read the format header and initialize the AVFormatContext
- * structure. Return 0 if OK. 'avformat_new_stream' should be
- * called to create new streams.
- */
- int (*read_header)(struct AVFormatContext *);
-
- /**
- * Read one packet and put it in 'pkt'. pts and flags are also
- * set. 'avformat_new_stream' can be called only if the flag
- * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
- * background thread).
- * @return 0 on success, < 0 on error.
- * When returning an error, pkt must not have been allocated
- * or must be freed before returning
- */
- int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
-
- /**
- * Close the stream. The AVFormatContext and AVStreams are not
- * freed by this function
- */
- int (*read_close)(struct AVFormatContext *);
-
- /**
- * Seek to a given timestamp relative to the frames in
- * stream component stream_index.
- * @param stream_index Must not be -1.
- * @param flags Selects which direction should be preferred if no exact
- * match is available.
- * @return >= 0 on success (but not necessarily the new offset)
- */
- int (*read_seek)(struct AVFormatContext *,
- int stream_index, int64_t timestamp, int flags);
-
- /**
- * Get the next timestamp in stream[stream_index].time_base units.
- * @return the timestamp or AV_NOPTS_VALUE if an error occurred
- */
- int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
- int64_t *pos, int64_t pos_limit);
-
- /**
- * Start/resume playing - only meaningful if using a network-based format
- * (RTSP).
- */
- int (*read_play)(struct AVFormatContext *);
-
- /**
- * Pause playing - only meaningful if using a network-based format
- * (RTSP).
- */
- int (*read_pause)(struct AVFormatContext *);
-
- /**
- * Seek to timestamp ts.
- * Seeking will be done so that the point from which all active streams
- * can be presented successfully will be closest to ts and within min/max_ts.
- * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
- */
- int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
-
- /**
- * Returns device list with it properties.
- * @see avdevice_list_devices() for more details.
- */
- int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
-
- /**
- * Initialize device capabilities submodule.
- * @see avdevice_capabilities_create() for more details.
- */
- int (*create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps);
-
- /**
- * Free device capabilities submodule.
- * @see avdevice_capabilities_free() for more details.
- */
- int (*free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps);
-} AVInputFormat;
-/**
- * @}
- */
-
-enum AVStreamParseType {
- AVSTREAM_PARSE_NONE,
- AVSTREAM_PARSE_FULL, /**< full parsing and repack */
- AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
- AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
- AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
- AVSTREAM_PARSE_FULL_RAW=MKTAG(0,'R','A','W'), /**< full parsing and repack with timestamp and position generation by parser for raw
- this assumes that each packet in the file contains no demuxer level headers and
- just codec level data, otherwise position generation would fail */
-};
-
-typedef struct AVIndexEntry {
- int64_t pos;
- int64_t timestamp; /**<
- * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
- * when seeking to this entry. That means preferable PTS on keyframe based formats.
- * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
- * is known
- */
-#define AVINDEX_KEYFRAME 0x0001
- int flags:2;
- int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
- int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
-} AVIndexEntry;
-
-#define AV_DISPOSITION_DEFAULT 0x0001
-#define AV_DISPOSITION_DUB 0x0002
-#define AV_DISPOSITION_ORIGINAL 0x0004
-#define AV_DISPOSITION_COMMENT 0x0008
-#define AV_DISPOSITION_LYRICS 0x0010
-#define AV_DISPOSITION_KARAOKE 0x0020
-
-/**
- * Track should be used during playback by default.
- * Useful for subtitle track that should be displayed
- * even when user did not explicitly ask for subtitles.
- */
-#define AV_DISPOSITION_FORCED 0x0040
-#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
-#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
-#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
-/**
- * The stream is stored in the file as an attached picture/"cover art" (e.g.
- * APIC frame in ID3v2). The single packet associated with it will be returned
- * among the first few packets read from the file unless seeking takes place.
- * It can also be accessed at any time in AVStream.attached_pic.
- */
-#define AV_DISPOSITION_ATTACHED_PIC 0x0400
-
-typedef struct AVStreamInternal AVStreamInternal;
-
-/**
- * To specify text track kind (different from subtitles default).
- */
-#define AV_DISPOSITION_CAPTIONS 0x10000
-#define AV_DISPOSITION_DESCRIPTIONS 0x20000
-#define AV_DISPOSITION_METADATA 0x40000
-
-/**
- * Options for behavior on timestamp wrap detection.
- */
-#define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
-#define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
-#define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
-
-/**
- * Stream structure.
- * New fields can be added to the end with minor version bumps.
- * Removal, reordering and changes to existing fields require a major
- * version bump.
- * sizeof(AVStream) must not be used outside libav*.
- */
-typedef struct AVStream {
- int index; /**< stream index in AVFormatContext */
- /**
- * Format-specific stream ID.
- * decoding: set by libavformat
- * encoding: set by the user, replaced by libavformat if left unset
- */
- int id;
- /**
- * Codec context associated with this stream. Allocated and freed by
- * libavformat.
- *
- * - decoding: The demuxer exports codec information stored in the headers
- * here.
- * - encoding: The user sets codec information, the muxer writes it to the
- * output. Mandatory fields as specified in AVCodecContext
- * documentation must be set even if this AVCodecContext is
- * not actually used for encoding.
- */
- AVCodecContext *codec;
- void *priv_data;
-
-#if FF_API_LAVF_FRAC
- /**
- * @deprecated this field is unused
- */
- attribute_deprecated
- struct AVFrac pts;
-#endif
-
- /**
- * This is the fundamental unit of time (in seconds) in terms
- * of which frame timestamps are represented.
- *
- * decoding: set by libavformat
- * encoding: May be set by the caller before avformat_write_header() to
- * provide a hint to the muxer about the desired timebase. In
- * avformat_write_header(), the muxer will overwrite this field
- * with the timebase that will actually be used for the timestamps
- * written into the file (which may or may not be related to the
- * user-provided one, depending on the format).
- */
- AVRational time_base;
-
- /**
- * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
- * Only set this if you are absolutely 100% sure that the value you set
- * it to really is the pts of the first frame.
- * This may be undefined (AV_NOPTS_VALUE).
- * @note The ASF header does NOT contain a correct start_time the ASF
- * demuxer must NOT set this.
- */
- int64_t start_time;
-
- /**
- * Decoding: duration of the stream, in stream time base.
- * If a source file does not specify a duration, but does specify
- * a bitrate, this value will be estimated from bitrate and file size.
- */
- int64_t duration;
-
- int64_t nb_frames; ///< number of frames in this stream if known or 0
-
- int disposition; /**< AV_DISPOSITION_* bit field */
-
- enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
-
- /**
- * sample aspect ratio (0 if unknown)
- * - encoding: Set by user.
- * - decoding: Set by libavformat.
- */
- AVRational sample_aspect_ratio;
-
- AVDictionary *metadata;
-
- /**
- * Average framerate
- *
- * - demuxing: May be set by libavformat when creating the stream or in
- * avformat_find_stream_info().
- * - muxing: May be set by the caller before avformat_write_header().
- */
- AVRational avg_frame_rate;
-
- /**
- * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
- * will contain the attached picture.
- *
- * decoding: set by libavformat, must not be modified by the caller.
- * encoding: unused
- */
- AVPacket attached_pic;
-
- /**
- * An array of side data that applies to the whole stream (i.e. the
- * container does not allow it to change between packets).
- *
- * There may be no overlap between the side data in this array and side data
- * in the packets. I.e. a given side data is either exported by the muxer
- * (demuxing) / set by the caller (muxing) in this array, then it never
- * appears in the packets, or the side data is exported / sent through
- * the packets (always in the first packet where the value becomes known or
- * changes), then it does not appear in this array.
- *
- * - demuxing: Set by libavformat when the stream is created.
- * - muxing: May be set by the caller before avformat_write_header().
- *
- * Freed by libavformat in avformat_free_context().
- *
- * @see av_format_inject_global_side_data()
- */
- AVPacketSideData *side_data;
- /**
- * The number of elements in the AVStream.side_data array.
- */
- int nb_side_data;
-
- /**
- * Flags for the user to detect events happening on the stream. Flags must
- * be cleared by the user once the event has been handled.
- * A combination of AVSTREAM_EVENT_FLAG_*.
- */
- int event_flags;
-#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
-
- /*****************************************************************
- * All fields below this line are not part of the public API. They
- * may not be used outside of libavformat and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
-
- /**
- * Stream information used internally by av_find_stream_info()
- */
-#define MAX_STD_TIMEBASES (30*12+30+3+6)
- 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;
-
- /**
- * 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;
-
- int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
-
- // Timestamp generation support:
- /**
- * Timestamp corresponding to the last dts sync point.
- *
- * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
- * a DTS is received from the underlying container. Otherwise set to
- * AV_NOPTS_VALUE by default.
- */
- int64_t first_dts;
- int64_t cur_dts;
- int64_t last_IP_pts;
- int last_IP_duration;
-
- /**
- * Number of packets to buffer for codec probing
- */
- int probe_packets;
-
- /**
- * Number of frames that have been demuxed during av_find_stream_info()
- */
- int codec_info_nb_frames;
-
- /* av_read_frame() support */
- enum AVStreamParseType need_parsing;
- struct AVCodecParserContext *parser;
-
- /**
- * last packet in packet_buffer for this stream when muxing.
- */
- struct AVPacketList *last_in_packet_buffer;
- AVProbeData probe_data;
-#define MAX_REORDER_DELAY 16
- int64_t pts_buffer[MAX_REORDER_DELAY+1];
-
- AVIndexEntry *index_entries; /**< Only used if the format does not
- support seeking natively. */
- int nb_index_entries;
- unsigned int index_entries_allocated_size;
-
- /**
- * Real base framerate of the stream.
- * This is the lowest framerate with which all timestamps can be
- * represented accurately (it is the least common multiple of all
- * framerates in the stream). Note, this value is just a guess!
- * For example, if the time base is 1/90000 and all frames have either
- * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
- *
- * Code outside avformat should access this field using:
- * av_stream_get/set_r_frame_rate(stream)
- */
- AVRational r_frame_rate;
-
- /**
- * Stream Identifier
- * This is the MPEG-TS stream identifier +1
- * 0 means unknown
- */
- int stream_identifier;
-
- 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.
- * NOT PART OF PUBLIC API
- */
- 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
- * NOT PART OF PUBLIC API
- */
- 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;
-
- /**
- * 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];
-
- /**
- * 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;
-
- /**
- * String containing paris of key and values describing recommended encoder configuration.
- * Paris are separated by ','.
- * Keys are separated from values by '='.
- */
- char *recommended_encoder_configuration;
-
- /**
- * display aspect ratio (0 if unknown)
- * - encoding: unused
- * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
- */
- AVRational display_aspect_ratio;
-
- struct FFFrac *priv_pts;
-
- /**
- * An opaque field for libavformat internal usage.
- * Must not be accessed in any way by callers.
- */
- AVStreamInternal *internal;
-} AVStream;
-
-AVRational av_stream_get_r_frame_rate(const AVStream *s);
-void av_stream_set_r_frame_rate(AVStream *s, AVRational r);
-struct AVCodecParserContext *av_stream_get_parser(const AVStream *s);
-char* av_stream_get_recommended_encoder_configuration(const AVStream *s);
-void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration);
-
-/**
- * Returns the pts of the last muxed packet + its duration
- *
- * the retuned value is undefined when used with a demuxer.
- */
-int64_t av_stream_get_end_pts(const AVStream *st);
-
-#define AV_PROGRAM_RUNNING 1
-
-/**
- * New fields can be added to the end with minor version bumps.
- * Removal, reordering and changes to existing fields require a major
- * version bump.
- * sizeof(AVProgram) must not be used outside libav*.
- */
-typedef struct AVProgram {
- int id;
- int flags;
- enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
- unsigned int *stream_index;
- unsigned int nb_stream_indexes;
- AVDictionary *metadata;
-
- int program_num;
- int pmt_pid;
- int pcr_pid;
-
- /*****************************************************************
- * All fields below this line are not part of the public API. They
- * may not be used outside of libavformat and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
- int64_t start_time;
- int64_t end_time;
-
- int64_t pts_wrap_reference; ///< reference dts for wrap detection
- int pts_wrap_behavior; ///< behavior on wrap detection
-} AVProgram;
-
-#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
- (streams are added dynamically) */
-
-typedef struct AVChapter {
- int id; ///< unique ID to identify the chapter
- AVRational time_base; ///< time base in which the start/end timestamps are specified
- int64_t start, end; ///< chapter start/end time in time_base units
- AVDictionary *metadata;
-} AVChapter;
-
-
-/**
- * Callback used by devices to communicate with application.
- */
-typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
- void *data, size_t data_size);
-
-typedef int (*AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
- const AVIOInterruptCB *int_cb, AVDictionary **options);
-
-/**
- * The duration of a video can be estimated through various ways, and this enum can be used
- * to know how the duration was estimated.
- */
-enum AVDurationEstimationMethod {
- AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
- AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
- AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
-};
-
-typedef struct AVFormatInternal AVFormatInternal;
-
-/**
- * Format I/O context.
- * New fields can be added to the end with minor version bumps.
- * Removal, reordering and changes to existing fields require a major
- * version bump.
- * sizeof(AVFormatContext) must not be used outside libav*, use
- * avformat_alloc_context() to create an AVFormatContext.
- */
-typedef struct AVFormatContext {
- /**
- * A class for logging and @ref avoptions. Set by avformat_alloc_context().
- * Exports (de)muxer private options if they exist.
- */
- const AVClass *av_class;
-
- /**
- * The input container format.
- *
- * Demuxing only, set by avformat_open_input().
- */
- struct AVInputFormat *iformat;
-
- /**
- * The output container format.
- *
- * Muxing only, must be set by the caller before avformat_write_header().
- */
- struct AVOutputFormat *oformat;
-
- /**
- * Format private data. This is an AVOptions-enabled struct
- * if and only if iformat/oformat.priv_class is not NULL.
- *
- * - muxing: set by avformat_write_header()
- * - demuxing: set by avformat_open_input()
- */
- void *priv_data;
-
- /**
- * I/O context.
- *
- * - demuxing: either set by the user before avformat_open_input() (then
- * the user must close it manually) or set by avformat_open_input().
- * - muxing: set by the user before avformat_write_header(). The caller must
- * take care of closing / freeing the IO context.
- *
- * Do NOT set this field if AVFMT_NOFILE flag is set in
- * iformat/oformat.flags. In such a case, the (de)muxer will handle
- * I/O in some other way and this field will be NULL.
- */
- AVIOContext *pb;
-
- /* stream info */
- /**
- * Flags signalling stream properties. A combination of AVFMTCTX_*.
- * Set by libavformat.
- */
- int ctx_flags;
-
- /**
- * Number of elements in AVFormatContext.streams.
- *
- * Set by avformat_new_stream(), must not be modified by any other code.
- */
- unsigned int nb_streams;
- /**
- * A list of all streams in the file. New streams are created with
- * avformat_new_stream().
- *
- * - demuxing: streams are created by libavformat in avformat_open_input().
- * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
- * appear in av_read_frame().
- * - muxing: streams are created by the user before avformat_write_header().
- *
- * Freed by libavformat in avformat_free_context().
- */
- AVStream **streams;
-
- /**
- * input or output filename
- *
- * - demuxing: set by avformat_open_input()
- * - muxing: may be set by the caller before avformat_write_header()
- */
- char filename[1024];
-
- /**
- * Position of the first frame of the component, in
- * AV_TIME_BASE fractional seconds. NEVER set this value directly:
- * It is deduced from the AVStream values.
- *
- * Demuxing only, set by libavformat.
- */
- int64_t start_time;
-
- /**
- * Duration of the stream, in AV_TIME_BASE fractional
- * seconds. Only set this value if you know none of the individual stream
- * durations and also do not set any of them. This is deduced from the
- * AVStream values if not set.
- *
- * Demuxing only, set by libavformat.
- */
- int64_t duration;
-
- /**
- * Total stream bitrate in bit/s, 0 if not
- * available. Never set it directly if the file_size and the
- * duration are known as FFmpeg can compute it automatically.
- */
- int64_t bit_rate;
-
- unsigned int packet_size;
- int max_delay;
-
- /**
- * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*.
- * Set by the user before avformat_open_input() / avformat_write_header().
- */
- int flags;
-#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
-#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
-#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
-#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
-#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
-#define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
-#define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
-#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
-#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
-#define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
-/**
- * When muxing, try to avoid writing any random/volatile data to the output.
- * This includes any random IDs, real-time timestamps/dates, muxer version, etc.
- *
- * This flag is mainly intended for testing.
- */
-#define AVFMT_FLAG_BITEXACT 0x0400
-#define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
-#define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
-#define AVFMT_FLAG_PRIV_OPT 0x20000 ///< Enable use of private options by delaying codec open (this could be made default once all code is converted)
-#define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
-#define AVFMT_FLAG_FAST_SEEK 0x80000 ///< Enable fast, but inaccurate seeks for some formats
-
- /**
- * Maximum size of the data read from input for determining
- * the input container format.
- * Demuxing only, set by the caller before avformat_open_input().
- */
- int64_t probesize;
-
- /**
- * Maximum duration (in AV_TIME_BASE units) of the data read
- * from input in avformat_find_stream_info().
- * Demuxing only, set by the caller before avformat_find_stream_info().
- * Can be set to 0 to let avformat choose using a heuristic.
- */
- int64_t max_analyze_duration;
-
- const uint8_t *key;
- int keylen;
-
- unsigned int nb_programs;
- AVProgram **programs;
-
- /**
- * Forced video codec_id.
- * Demuxing: Set by user.
- */
- enum AVCodecID video_codec_id;
-
- /**
- * Forced audio codec_id.
- * Demuxing: Set by user.
- */
- enum AVCodecID audio_codec_id;
-
- /**
- * Forced subtitle codec_id.
- * Demuxing: Set by user.
- */
- enum AVCodecID subtitle_codec_id;
-
- /**
- * Maximum amount of memory in bytes to use for the index of each stream.
- * If the index exceeds this size, entries will be discarded as
- * needed to maintain a smaller size. This can lead to slower or less
- * accurate seeking (depends on demuxer).
- * Demuxers for which a full in-memory index is mandatory will ignore
- * this.
- * - muxing: unused
- * - demuxing: set by user
- */
- unsigned int max_index_size;
-
- /**
- * Maximum amount of memory in bytes to use for buffering frames
- * obtained from realtime capture devices.
- */
- unsigned int max_picture_buffer;
-
- /**
- * Number of chapters in AVChapter array.
- * When muxing, chapters are normally written in the file header,
- * so nb_chapters should normally be initialized before write_header
- * is called. Some muxers (e.g. mov and mkv) can also write chapters
- * in the trailer. To write chapters in the trailer, nb_chapters
- * must be zero when write_header is called and non-zero when
- * write_trailer is called.
- * - muxing: set by user
- * - demuxing: set by libavformat
- */
- unsigned int nb_chapters;
- AVChapter **chapters;
-
- /**
- * Metadata that applies to the whole file.
- *
- * - demuxing: set by libavformat in avformat_open_input()
- * - muxing: may be set by the caller before avformat_write_header()
- *
- * Freed by libavformat in avformat_free_context().
- */
- AVDictionary *metadata;
-
- /**
- * Start time of the stream in real world time, in microseconds
- * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
- * stream was captured at this real world time.
- * - muxing: Set by the caller before avformat_write_header(). If set to
- * either 0 or AV_NOPTS_VALUE, then the current wall-time will
- * be used.
- * - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
- * the value may become known after some number of frames
- * have been received.
- */
- int64_t start_time_realtime;
-
- /**
- * The number of frames used for determining the framerate in
- * avformat_find_stream_info().
- * Demuxing only, set by the caller before avformat_find_stream_info().
- */
- int fps_probe_size;
-
- /**
- * Error recognition; higher values will detect more errors but may
- * misdetect some more or less valid parts as errors.
- * Demuxing only, set by the caller before avformat_open_input().
- */
- int error_recognition;
-
- /**
- * Custom interrupt callbacks for the I/O layer.
- *
- * demuxing: set by the user before avformat_open_input().
- * muxing: set by the user before avformat_write_header()
- * (mainly useful for AVFMT_NOFILE formats). The callback
- * should also be passed to avio_open2() if it's used to
- * open the file.
- */
- AVIOInterruptCB interrupt_callback;
-
- /**
- * Flags to enable debugging.
- */
- int debug;
-#define FF_FDEBUG_TS 0x0001
-
- /**
- * Maximum buffering duration for interleaving.
- *
- * To ensure all the streams are interleaved correctly,
- * av_interleaved_write_frame() will wait until it has at least one packet
- * for each stream before actually writing any packets to the output file.
- * When some streams are "sparse" (i.e. there are large gaps between
- * successive packets), this can result in excessive buffering.
- *
- * This field specifies the maximum difference between the timestamps of the
- * first and the last packet in the muxing queue, above which libavformat
- * will output a packet regardless of whether it has queued a packet for all
- * the streams.
- *
- * Muxing only, set by the caller before avformat_write_header().
- */
- int64_t max_interleave_delta;
-
- /**
- * Allow non-standard and experimental extension
- * @see AVCodecContext.strict_std_compliance
- */
- int strict_std_compliance;
-
- /**
- * Flags for the user to detect events happening on the file. Flags must
- * be cleared by the user once the event has been handled.
- * A combination of AVFMT_EVENT_FLAG_*.
- */
- int event_flags;
-#define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
-
- /**
- * Maximum number of packets to read while waiting for the first timestamp.
- * Decoding only.
- */
- int max_ts_probe;
-
- /**
- * Avoid negative timestamps during muxing.
- * Any value of the AVFMT_AVOID_NEG_TS_* constants.
- * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
- * - muxing: Set by user
- * - demuxing: unused
- */
- int avoid_negative_ts;
-#define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format
-#define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative
-#define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0
-
- /**
- * Transport stream id.
- * This will be moved into demuxer private options. Thus no API/ABI compatibility
- */
- int ts_id;
-
- /**
- * Audio preload in microseconds.
- * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
- * - encoding: Set by user via AVOptions (NO direct access)
- * - decoding: unused
- */
- int audio_preload;
-
- /**
- * Max chunk time in microseconds.
- * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
- * - encoding: Set by user via AVOptions (NO direct access)
- * - decoding: unused
- */
- int max_chunk_duration;
-
- /**
- * Max chunk size in bytes
- * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
- * - encoding: Set by user via AVOptions (NO direct access)
- * - decoding: unused
- */
- int max_chunk_size;
-
- /**
- * forces the use of wallclock timestamps as pts/dts of packets
- * This has undefined results in the presence of B frames.
- * - encoding: unused
- * - decoding: Set by user via AVOptions (NO direct access)
- */
- int use_wallclock_as_timestamps;
-
- /**
- * avio flags, used to force AVIO_FLAG_DIRECT.
- * - encoding: unused
- * - decoding: Set by user via AVOptions (NO direct access)
- */
- int avio_flags;
-
- /**
- * The duration field can be estimated through various ways, and this field can be used
- * to know how the duration was estimated.
- * - encoding: unused
- * - decoding: Read by user via AVOptions (NO direct access)
- */
- enum AVDurationEstimationMethod duration_estimation_method;
-
- /**
- * Skip initial bytes when opening stream
- * - encoding: unused
- * - decoding: Set by user via AVOptions (NO direct access)
- */
- int64_t skip_initial_bytes;
-
- /**
- * Correct single timestamp overflows
- * - encoding: unused
- * - decoding: Set by user via AVOptions (NO direct access)
- */
- unsigned int correct_ts_overflow;
-
- /**
- * Force seeking to any (also non key) frames.
- * - encoding: unused
- * - decoding: Set by user via AVOptions (NO direct access)
- */
- int seek2any;
-
- /**
- * Flush the I/O context after each packet.
- * - encoding: Set by user via AVOptions (NO direct access)
- * - decoding: unused
- */
- int flush_packets;
-
- /**
- * format probing score.
- * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
- * the format.
- * - encoding: unused
- * - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
- */
- int probe_score;
-
- /**
- * number of bytes to read maximally to identify format.
- * - encoding: unused
- * - decoding: set by user through AVOPtions (NO direct access)
- */
- int format_probesize;
-
- /**
- * ',' separated list of allowed decoders.
- * If NULL then all are allowed
- * - encoding: unused
- * - decoding: set by user through AVOptions (NO direct access)
- */
- char *codec_whitelist;
-
- /**
- * ',' separated list of allowed demuxers.
- * If NULL then all are allowed
- * - encoding: unused
- * - decoding: set by user through AVOptions (NO direct access)
- */
- char *format_whitelist;
-
- /**
- * An opaque field for libavformat internal usage.
- * Must not be accessed in any way by callers.
- */
- AVFormatInternal *internal;
-
- /**
- * IO repositioned flag.
- * This is set by avformat when the underlaying IO context read pointer
- * is repositioned, for example when doing byte based seeking.
- * Demuxers can use the flag to detect such changes.
- */
- int io_repositioned;
-
- /**
- * Forced video codec.
- * This allows forcing a specific decoder, even when there are multiple with
- * the same codec_id.
- * Demuxing: Set by user via av_format_set_video_codec (NO direct access).
- */
- AVCodec *video_codec;
-
- /**
- * Forced audio codec.
- * This allows forcing a specific decoder, even when there are multiple with
- * the same codec_id.
- * Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
- */
- AVCodec *audio_codec;
-
- /**
- * Forced subtitle codec.
- * This allows forcing a specific decoder, even when there are multiple with
- * the same codec_id.
- * Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
- */
- AVCodec *subtitle_codec;
-
- /**
- * Forced data codec.
- * This allows forcing a specific decoder, even when there are multiple with
- * the same codec_id.
- * Demuxing: Set by user via av_format_set_data_codec (NO direct access).
- */
- AVCodec *data_codec;
-
- /**
- * Number of bytes to be written as padding in a metadata header.
- * Demuxing: Unused.
- * Muxing: Set by user via av_format_set_metadata_header_padding.
- */
- int metadata_header_padding;
-
- /**
- * User data.
- * This is a place for some private data of the user.
- */
- void *opaque;
-
- /**
- * Callback used by devices to communicate with application.
- */
- av_format_control_message control_message_cb;
-
- /**
- * Output timestamp offset, in microseconds.
- * Muxing: set by user via AVOptions (NO direct access)
- */
- int64_t output_ts_offset;
-
- /**
- * dump format separator.
- * can be ", " or "\n " or anything else
- * Code outside libavformat should access this field using AVOptions
- * (NO direct access).
- * - muxing: Set by user.
- * - demuxing: Set by user.
- */
- uint8_t *dump_separator;
-
- /**
- * Forced Data codec_id.
- * Demuxing: Set by user.
- */
- enum AVCodecID data_codec_id;
-
-#if FF_API_OLD_OPEN_CALLBACKS
- /**
- * Called to open further IO contexts when needed for demuxing.
- *
- * This can be set by the user application to perform security checks on
- * the URLs before opening them.
- * The function should behave like avio_open2(), AVFormatContext is provided
- * as contextual information and to reach AVFormatContext.opaque.
- *
- * If NULL then some simple checks are used together with avio_open2().
- *
- * Must not be accessed directly from outside avformat.
- * @See av_format_set_open_cb()
- *
- * Demuxing: Set by user.
- *
- * @deprecated Use io_open and io_close.
- */
- attribute_deprecated
- int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
-#endif
-
- /**
- * ',' separated list of allowed protocols.
- * - encoding: unused
- * - decoding: set by user through AVOptions (NO direct access)
- */
- char *protocol_whitelist;
-
- /*
- * A callback for opening new IO streams.
- *
- * Certain muxers or demuxers (e.g. for various playlist-based formats) need
- * to open additional files during muxing or demuxing. This callback allows
- * the caller to provide custom IO in such cases.
- *
- * @param s the format context
- * @param pb on success, the newly opened IO context should be returned here
- * @param url the url to open
- * @param flags a combination of AVIO_FLAG_*
- * @param options a dictionary of additional options, with the same
- * semantics as in avio_open2()
- * @return 0 on success, a negative AVERROR code on failure
- *
- * @note Certain muxers and demuxers do nesting, i.e. they open one or more
- * additional internal format contexts. Thus the AVFormatContext pointer
- * passed to this callback may be different from the one facing the caller.
- * It will, however, have the same 'opaque' field.
- */
- int (*io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url,
- int flags, AVDictionary **options);
-
- /**
- * A callback for closing the streams opened with AVFormatContext.io_open().
- */
- void (*io_close)(struct AVFormatContext *s, AVIOContext *pb);
-
- /**
- * The maximum number of streams.
- * - encoding: unused
- * - decoding: set by user through AVOptions (NO direct access)
- */
- int max_streams;
-} AVFormatContext;
-
-int av_format_get_probe_score(const AVFormatContext *s);
-AVCodec * av_format_get_video_codec(const AVFormatContext *s);
-void av_format_set_video_codec(AVFormatContext *s, AVCodec *c);
-AVCodec * av_format_get_audio_codec(const AVFormatContext *s);
-void av_format_set_audio_codec(AVFormatContext *s, AVCodec *c);
-AVCodec * av_format_get_subtitle_codec(const AVFormatContext *s);
-void av_format_set_subtitle_codec(AVFormatContext *s, AVCodec *c);
-AVCodec * av_format_get_data_codec(const AVFormatContext *s);
-void av_format_set_data_codec(AVFormatContext *s, AVCodec *c);
-int av_format_get_metadata_header_padding(const AVFormatContext *s);
-void av_format_set_metadata_header_padding(AVFormatContext *s, int c);
-void * av_format_get_opaque(const AVFormatContext *s);
-void av_format_set_opaque(AVFormatContext *s, void *opaque);
-av_format_control_message av_format_get_control_message_cb(const AVFormatContext *s);
-void av_format_set_control_message_cb(AVFormatContext *s, av_format_control_message callback);
-#if FF_API_OLD_OPEN_CALLBACKS
-attribute_deprecated AVOpenCallback av_format_get_open_cb(const AVFormatContext *s);
-attribute_deprecated void av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback);
-#endif
-
-/**
- * This function will cause global side data to be injected in the next packet
- * of each stream as well as after any subsequent seek.
- */
-void av_format_inject_global_side_data(AVFormatContext *s);
-
-/**
- * Returns the method used to set ctx->duration.
- *
- * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
- */
-enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx);
-
-typedef struct AVPacketList {
- AVPacket pkt;
- struct AVPacketList *next;
-} AVPacketList;
-
-
-/**
- * @defgroup lavf_core Core functions
- * @ingroup libavf
- *
- * Functions for querying libavformat capabilities, allocating core structures,
- * etc.
- * @{
- */
-
-/**
- * Return the LIBAVFORMAT_VERSION_INT constant.
- */
-unsigned avformat_version(void);
-
-/**
- * Return the libavformat build-time configuration.
- */
-const char *avformat_configuration(void);
-
-/**
- * Return the libavformat license.
- */
-const char *avformat_license(void);
-
-/**
- * Initialize libavformat and register all the muxers, demuxers and
- * protocols. If you do not call this function, then you can select
- * exactly which formats you want to support.
- *
- * @see av_register_input_format()
- * @see av_register_output_format()
- */
-void av_register_all(void);
-
-void av_register_input_format(AVInputFormat *format);
-void av_register_output_format(AVOutputFormat *format);
-
-/**
- * Do global initialization of network components. This is optional,
- * but recommended, since it avoids the overhead of implicitly
- * doing the setup for each session.
- *
- * Calling this function will become mandatory if using network
- * protocols at some major version bump.
- */
-int avformat_network_init(void);
-
-/**
- * Undo the initialization done by avformat_network_init.
- */
-int avformat_network_deinit(void);
-
-/**
- * If f is NULL, returns the first registered input format,
- * if f is non-NULL, returns the next registered input format after f
- * or NULL if f is the last one.
- */
-AVInputFormat *av_iformat_next(const AVInputFormat *f);
-
-/**
- * If f is NULL, returns the first registered output format,
- * if f is non-NULL, returns the next registered output format after f
- * or NULL if f is the last one.
- */
-AVOutputFormat *av_oformat_next(const AVOutputFormat *f);
-
-/**
- * Allocate an AVFormatContext.
- * avformat_free_context() can be used to free the context and everything
- * allocated by the framework within it.
- */
-AVFormatContext *avformat_alloc_context(void);
-
-/**
- * Free an AVFormatContext and all its streams.
- * @param s context to free
- */
-void avformat_free_context(AVFormatContext *s);
-
-/**
- * Get the AVClass for AVFormatContext. It can be used in combination with
- * AV_OPT_SEARCH_FAKE_OBJ for examining options.
- *
- * @see av_opt_find().
- */
-const AVClass *avformat_get_class(void);
-
-/**
- * Add a new stream to a media file.
- *
- * When demuxing, it is called by the demuxer in read_header(). If the
- * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
- * be called in read_packet().
- *
- * When muxing, should be called by the user before avformat_write_header().
- *
- * User is required to call avcodec_close() and avformat_free_context() to
- * clean up the allocation by avformat_new_stream().
- *
- * @param s media file handle
- * @param c If non-NULL, the AVCodecContext corresponding to the new stream
- * will be initialized to use this codec. This is needed for e.g. codec-specific
- * defaults to be set, so codec should be provided if it is known.
- *
- * @return newly created stream or NULL on error.
- */
-AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c);
-
-/**
- * Allocate new information from stream.
- *
- * @param stream stream
- * @param type desired side information type
- * @param size side information size
- * @return pointer to fresh allocated data or NULL otherwise
- */
-uint8_t *av_stream_new_side_data(AVStream *stream,
- enum AVPacketSideDataType type, int size);
-/**
- * Get side information from stream.
- *
- * @param stream stream
- * @param type desired side information type
- * @param size pointer for side information size to store (optional)
- * @return pointer to data if present or NULL otherwise
- */
-uint8_t *av_stream_get_side_data(AVStream *stream,
- enum AVPacketSideDataType type, int *size);
-
-AVProgram *av_new_program(AVFormatContext *s, int id);
-
-/**
- * @}
- */
-
-
-/**
- * Allocate an AVFormatContext for an output format.
- * avformat_free_context() can be used to free the context and
- * everything allocated by the framework within it.
- *
- * @param *ctx is set to the created format context, or to NULL in
- * case of failure
- * @param oformat format to use for allocating the context, if NULL
- * format_name and filename are used instead
- * @param format_name the name of output format to use for allocating the
- * context, if NULL filename is used instead
- * @param filename the name of the filename to use for allocating the
- * context, may be NULL
- * @return >= 0 in case of success, a negative AVERROR code in case of
- * failure
- */
-int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat,
- const char *format_name, const char *filename);
-
-/**
- * @addtogroup lavf_decoding
- * @{
- */
-
-/**
- * Find AVInputFormat based on the short name of the input format.
- */
-AVInputFormat *av_find_input_format(const char *short_name);
-
-/**
- * Guess the file format.
- *
- * @param pd data to be probed
- * @param is_opened Whether the file is already opened; determines whether
- * demuxers with or without AVFMT_NOFILE are probed.
- */
-AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
-
-/**
- * Guess the file format.
- *
- * @param pd data to be probed
- * @param is_opened Whether the file is already opened; determines whether
- * demuxers with or without AVFMT_NOFILE are probed.
- * @param score_max A probe score larger that this is required to accept a
- * detection, the variable is set to the actual detection
- * score afterwards.
- * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
- * to retry with a larger probe buffer.
- */
-AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
-
-/**
- * Guess the file format.
- *
- * @param is_opened Whether the file is already opened; determines whether
- * demuxers with or without AVFMT_NOFILE are probed.
- * @param score_ret The score of the best detection.
- */
-AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
-
-/**
- * Probe a bytestream to determine the input format. Each time a probe returns
- * with a score that is too low, the probe buffer size is increased and another
- * attempt is made. When the maximum probe size is reached, the input format
- * with the highest score is returned.
- *
- * @param pb the bytestream to probe
- * @param fmt the input format is put here
- * @param url the url of the stream
- * @param logctx the log context
- * @param offset the offset within the bytestream to probe from
- * @param max_probe_size the maximum probe buffer size (zero for default)
- * @return the score in case of success, a negative value corresponding to an
- * the maximal score is AVPROBE_SCORE_MAX
- * AVERROR code otherwise
- */
-int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt,
- const char *url, void *logctx,
- unsigned int offset, unsigned int max_probe_size);
-
-/**
- * Like av_probe_input_buffer2() but returns 0 on success
- */
-int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
- const char *url, void *logctx,
- unsigned int offset, unsigned int max_probe_size);
-
-/**
- * Open an input stream and read the header. The codecs are not opened.
- * The stream must be closed with avformat_close_input().
- *
- * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
- * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
- * function and written into ps.
- * Note that a user-supplied AVFormatContext will be freed on failure.
- * @param url URL of the stream to open.
- * @param fmt If non-NULL, this parameter forces a specific input format.
- * Otherwise the format is autodetected.
- * @param options A dictionary filled with AVFormatContext and demuxer-private options.
- * On return this parameter will be destroyed and replaced with a dict containing
- * options that were not found. May be NULL.
- *
- * @return 0 on success, a negative AVERROR on failure.
- *
- * @note If you want to use custom IO, preallocate the format context and set its pb field.
- */
-int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options);
-
-attribute_deprecated
-int av_demuxer_open(AVFormatContext *ic);
-
-/**
- * Read packets of a media file to get stream information. This
- * is useful for file formats with no headers such as MPEG. This
- * function also computes the real framerate in case of MPEG-2 repeat
- * frame mode.
- * The logical file position is not changed by this function;
- * examined packets may be buffered for later processing.
- *
- * @param ic media file handle
- * @param options If non-NULL, an ic.nb_streams long array of pointers to
- * dictionaries, where i-th member contains options for
- * codec corresponding to i-th stream.
- * On return each dictionary will be filled with options that were not found.
- * @return >=0 if OK, AVERROR_xxx on error
- *
- * @note this function isn't guaranteed to open all the codecs, so
- * options being non-empty at return is a perfectly normal behavior.
- *
- * @todo Let the user decide somehow what information is needed so that
- * we do not waste time getting stuff the user does not need.
- */
-int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
-
-/**
- * Find the programs which belong to a given stream.
- *
- * @param ic media file handle
- * @param last the last found program, the search will start after this
- * program, or from the beginning if it is NULL
- * @param s stream index
- * @return the next program which belongs to s, NULL if no program is found or
- * the last program is not among the programs of ic.
- */
-AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s);
-
-void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
-
-/**
- * Find the "best" stream in the file.
- * The best stream is determined according to various heuristics as the most
- * likely to be what the user expects.
- * If the decoder parameter is non-NULL, av_find_best_stream will find the
- * default decoder for the stream's codec; streams for which no decoder can
- * be found are ignored.
- *
- * @param ic media file handle
- * @param type stream type: video, audio, subtitles, etc.
- * @param wanted_stream_nb user-requested stream number,
- * or -1 for automatic selection
- * @param related_stream try to find a stream related (eg. in the same
- * program) to this one, or -1 if none
- * @param decoder_ret if non-NULL, returns the decoder for the
- * selected stream
- * @param flags flags; none are currently defined
- * @return the non-negative stream number in case of success,
- * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
- * could be found,
- * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
- * @note If av_find_best_stream returns successfully and decoder_ret is not
- * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
- */
-int av_find_best_stream(AVFormatContext *ic,
- enum AVMediaType type,
- int wanted_stream_nb,
- int related_stream,
- AVCodec **decoder_ret,
- int flags);
-
-/**
- * Return the next frame of a stream.
- * This function returns what is stored in the file, and does not validate
- * that what is there are valid frames for the decoder. It will split what is
- * stored in the file into frames and return one for each call. It will not
- * omit invalid data between valid frames so as to give the decoder the maximum
- * information possible for decoding.
- *
- * If pkt->buf is NULL, then the packet is valid until the next
- * av_read_frame() or until avformat_close_input(). Otherwise the packet
- * is valid indefinitely. In both cases the packet must be freed with
- * av_packet_unref when it is no longer needed. For video, the packet contains
- * exactly one frame. For audio, it contains an integer number of frames if each
- * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
- * have a variable size (e.g. MPEG audio), then it contains one frame.
- *
- * pkt->pts, pkt->dts and pkt->duration are always set to correct
- * values in AVStream.time_base units (and guessed if the format cannot
- * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
- * has B-frames, so it is better to rely on pkt->dts if you do not
- * decompress the payload.
- *
- * @return 0 if OK, < 0 on error or end of file
- */
-int av_read_frame(AVFormatContext *s, AVPacket *pkt);
-
-/**
- * Seek to the keyframe at timestamp.
- * 'timestamp' in 'stream_index'.
- *
- * @param s media file handle
- * @param stream_index If stream_index is (-1), a default
- * stream is selected, and timestamp is automatically converted
- * from AV_TIME_BASE units to the stream specific time_base.
- * @param timestamp Timestamp in AVStream.time_base units
- * or, if no stream is specified, in AV_TIME_BASE units.
- * @param flags flags which select direction and seeking mode
- * @return >= 0 on success
- */
-int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
- int flags);
-
-/**
- * Seek to timestamp ts.
- * Seeking will be done so that the point from which all active streams
- * can be presented successfully will be closest to ts and within min/max_ts.
- * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
- *
- * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
- * are the file position (this may not be supported by all demuxers).
- * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
- * in the stream with stream_index (this may not be supported by all demuxers).
- * Otherwise all timestamps are in units of the stream selected by stream_index
- * or if stream_index is -1, in AV_TIME_BASE units.
- * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
- * keyframes (this may not be supported by all demuxers).
- * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
- *
- * @param s media file handle
- * @param stream_index index of the stream which is used as time base reference
- * @param min_ts smallest acceptable timestamp
- * @param ts target timestamp
- * @param max_ts largest acceptable timestamp
- * @param flags flags
- * @return >=0 on success, error code otherwise
- *
- * @note This is part of the new seek API which is still under construction.
- * Thus do not use this yet. It may change at any time, do not expect
- * ABI compatibility yet!
- */
-int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
-
-/**
- * Discard all internally buffered data. This can be useful when dealing with
- * discontinuities in the byte stream. Generally works only with formats that
- * can resync. This includes headerless formats like MPEG-TS/TS but should also
- * work with NUT, Ogg and in a limited way AVI for example.
- *
- * The set of streams, the detected duration, stream parameters and codecs do
- * not change when calling this function. If you want a complete reset, it's
- * better to open a new AVFormatContext.
- *
- * This does not flush the AVIOContext (s->pb). If necessary, call
- * avio_flush(s->pb) before calling this function.
- *
- * @param s media file handle
- * @return >=0 on success, error code otherwise
- */
-int avformat_flush(AVFormatContext *s);
-
-/**
- * Start playing a network-based stream (e.g. RTSP stream) at the
- * current position.
- */
-int av_read_play(AVFormatContext *s);
-
-/**
- * Pause a network-based stream (e.g. RTSP stream).
- *
- * Use av_read_play() to resume it.
- */
-int av_read_pause(AVFormatContext *s);
-
-/**
- * Close an opened input AVFormatContext. Free it and all its contents
- * and set *s to NULL.
- */
-void avformat_close_input(AVFormatContext **s);
-/**
- * @}
- */
-
-#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
-#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
-#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
-#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
-
-/**
- * @addtogroup lavf_encoding
- * @{
- */
-/**
- * Allocate the stream private data and write the stream header to
- * an output media file.
- *
- * @param s Media file handle, must be allocated with avformat_alloc_context().
- * Its oformat field must be set to the desired output format;
- * Its pb field must be set to an already opened AVIOContext.
- * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
- * On return this parameter will be destroyed and replaced with a dict containing
- * options that were not found. May be NULL.
- *
- * @return 0 on success, negative AVERROR on failure.
- *
- * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
- */
-av_warn_unused_result
-int avformat_write_header(AVFormatContext *s, AVDictionary **options);
-
-/**
- * Write a packet to an output media file.
- *
- * This function passes the packet directly to the muxer, without any buffering
- * or reordering. The caller is responsible for correctly interleaving the
- * packets if the format requires it. Callers that want libavformat to handle
- * the interleaving should call av_interleaved_write_frame() instead of this
- * function.
- *
- * @param s media file handle
- * @param pkt The packet containing the data to be written. Note that unlike
- * av_interleaved_write_frame(), this function does not take
- * ownership of the packet passed to it (though some muxers may make
- * an internal reference to the input packet).
- * <br>
- * This parameter can be NULL (at any time, not just at the end), in
- * order to immediately flush data buffered within the muxer, for
- * muxers that buffer up data internally before writing it to the
- * output.
- * <br>
- * Packet's @ref AVPacket.stream_index "stream_index" field must be
- * set to the index of the corresponding stream in @ref
- * AVFormatContext.streams "s->streams".
- * <br>
- * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts")
- * must be set to correct values in the stream's timebase (unless the
- * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then
- * they can be set to AV_NOPTS_VALUE).
- * The dts for subsequent packets passed to this function must be strictly
- * increasing when compared in their respective timebases (unless the
- * output format is flagged with the AVFMT_TS_NONSTRICT, then they
- * merely have to be nondecreasing). @ref AVPacket.duration
- * "duration") should also be set if known.
- * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
- *
- * @see av_interleaved_write_frame()
- */
-int av_write_frame(AVFormatContext *s, AVPacket *pkt);
-
-/**
- * Write a packet to an output media file ensuring correct interleaving.
- *
- * This function will buffer the packets internally as needed to make sure the
- * packets in the output file are properly interleaved in the order of
- * increasing dts. Callers doing their own interleaving should call
- * av_write_frame() instead of this function.
- *
- * @param s media file handle
- * @param pkt The packet containing the data to be written.
- * <br>
- * If the packet is reference-counted, this function will take
- * ownership of this reference and unreference it later when it sees
- * fit.
- * The caller must not access the data through this reference after
- * this function returns. If the packet is not reference-counted,
- * libavformat will make a copy.
- * <br>
- * This parameter can be NULL (at any time, not just at the end), to
- * flush the interleaving queues.
- * <br>
- * Packet's @ref AVPacket.stream_index "stream_index" field must be
- * set to the index of the corresponding stream in @ref
- * AVFormatContext.streams "s->streams".
- * <br>
- * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts")
- * must be set to correct values in the stream's timebase (unless the
- * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then
- * they can be set to AV_NOPTS_VALUE).
- * The dts for subsequent packets in one stream must be strictly
- * increasing (unless the output format is flagged with the
- * AVFMT_TS_NONSTRICT, then they merely have to be nondecreasing).
- * @ref AVPacket.duration "duration") should also be set if known.
- *
- * @return 0 on success, a negative AVERROR on error. Libavformat will always
- * take care of freeing the packet, even if this function fails.
- *
- * @see av_write_frame(), AVFormatContext.max_interleave_delta
- */
-int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
-
-/**
- * Write a uncoded frame to an output media file.
- *
- * The frame must be correctly interleaved according to the container
- * specification; if not, then av_interleaved_write_frame() must be used.
- *
- * See av_interleaved_write_frame() for details.
- */
-int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
- AVFrame *frame);
-
-/**
- * Write a uncoded frame to an output media file.
- *
- * If the muxer supports it, this function makes it possible to write an AVFrame
- * structure directly, without encoding it into a packet.
- * It is mostly useful for devices and similar special muxers that use raw
- * video or PCM data and will not serialize it into a byte stream.
- *
- * To test whether it is possible to use it with a given muxer and stream,
- * use av_write_uncoded_frame_query().
- *
- * The caller gives up ownership of the frame and must not access it
- * afterwards.
- *
- * @return >=0 for success, a negative code on error
- */
-int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
- AVFrame *frame);
-
-/**
- * Test whether a muxer supports uncoded frame.
- *
- * @return >=0 if an uncoded frame can be written to that muxer and stream,
- * <0 if not
- */
-int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index);
-
-/**
- * Write the stream trailer to an output media file and free the
- * file private data.
- *
- * May only be called after a successful call to avformat_write_header.
- *
- * @param s media file handle
- * @return 0 if OK, AVERROR_xxx on error
- */
-int av_write_trailer(AVFormatContext *s);
-
-/**
- * Return the output format in the list of registered output formats
- * which best matches the provided parameters, or return NULL if
- * there is no match.
- *
- * @param short_name if non-NULL checks if short_name matches with the
- * names of the registered formats
- * @param filename if non-NULL checks if filename terminates with the
- * extensions of the registered formats
- * @param mime_type if non-NULL checks if mime_type matches with the
- * MIME type of the registered formats
- */
-AVOutputFormat *av_guess_format(const char *short_name,
- const char *filename,
- const char *mime_type);
-
-/**
- * Guess the codec ID based upon muxer and filename.
- */
-enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
- const char *filename, const char *mime_type,
- enum AVMediaType type);
-
-/**
- * Get timing information for the data currently output.
- * The exact meaning of "currently output" depends on the format.
- * It is mostly relevant for devices that have an internal buffer and/or
- * work in real time.
- * @param s media file handle
- * @param stream stream in the media file
- * @param[out] dts DTS of the last packet output for the stream, in stream
- * time_base units
- * @param[out] wall absolute time when that packet whas output,
- * in microsecond
- * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
- * Note: some formats or devices may not allow to measure dts and wall
- * atomically.
- */
-int av_get_output_timestamp(struct AVFormatContext *s, int stream,
- int64_t *dts, int64_t *wall);
-
-
-/**
- * @}
- */
-
-
-/**
- * @defgroup lavf_misc Utility functions
- * @ingroup libavf
- * @{
- *
- * Miscellaneous utility functions related to both muxing and demuxing
- * (or neither).
- */
-
-/**
- * Send a nice hexadecimal dump of a buffer to the specified file stream.
- *
- * @param f The file stream pointer where the dump should be sent to.
- * @param buf buffer
- * @param size buffer size
- *
- * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
- */
-void av_hex_dump(FILE *f, const uint8_t *buf, int size);
-
-/**
- * Send a nice hexadecimal dump of a buffer to the log.
- *
- * @param avcl A pointer to an arbitrary struct of which the first field is a
- * pointer to an AVClass struct.
- * @param level The importance level of the message, lower values signifying
- * higher importance.
- * @param buf buffer
- * @param size buffer size
- *
- * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
- */
-void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
-
-/**
- * Send a nice dump of a packet to the specified file stream.
- *
- * @param f The file stream pointer where the dump should be sent to.
- * @param pkt packet to dump
- * @param dump_payload True if the payload must be displayed, too.
- * @param st AVStream that the packet belongs to
- */
-void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st);
-
-
-/**
- * Send a nice dump of a packet to the log.
- *
- * @param avcl A pointer to an arbitrary struct of which the first field is a
- * pointer to an AVClass struct.
- * @param level The importance level of the message, lower values signifying
- * higher importance.
- * @param pkt packet to dump
- * @param dump_payload True if the payload must be displayed, too.
- * @param st AVStream that the packet belongs to
- */
-void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload,
- const AVStream *st);
-
-/**
- * Get the AVCodecID for the given codec tag tag.
- * If no codec id is found returns AV_CODEC_ID_NONE.
- *
- * @param tags list of supported codec_id-codec_tag pairs, as stored
- * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
- * @param tag codec tag to match to a codec ID
- */
-enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
-
-/**
- * Get the codec tag for the given codec id id.
- * If no codec tag is found returns 0.
- *
- * @param tags list of supported codec_id-codec_tag pairs, as stored
- * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
- * @param id codec ID to match to a codec tag
- */
-unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
-
-/**
- * Get the codec tag for the given codec id.
- *
- * @param tags list of supported codec_id - codec_tag pairs, as stored
- * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
- * @param id codec id that should be searched for in the list
- * @param tag A pointer to the found tag
- * @return 0 if id was not found in tags, > 0 if it was found
- */
-int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
- unsigned int *tag);
-
-int av_find_default_stream_index(AVFormatContext *s);
-
-/**
- * Get the index for a specific timestamp.
- *
- * @param st stream that the timestamp belongs to
- * @param timestamp timestamp to retrieve the index for
- * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
- * to the timestamp which is <= the requested one, if backward
- * is 0, then it will be >=
- * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
- * @return < 0 if no such timestamp could be found
- */
-int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
-
-/**
- * Add an index entry into a sorted list. Update the entry if the list
- * already contains it.
- *
- * @param timestamp timestamp in the time base of the given stream
- */
-int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
- int size, int distance, int flags);
-
-
-/**
- * Split a URL string into components.
- *
- * The pointers to buffers for storing individual components may be null,
- * in order to ignore that component. Buffers for components not found are
- * set to empty strings. If the port is not found, it is set to a negative
- * value.
- *
- * @param proto the buffer for the protocol
- * @param proto_size the size of the proto buffer
- * @param authorization the buffer for the authorization
- * @param authorization_size the size of the authorization buffer
- * @param hostname the buffer for the host name
- * @param hostname_size the size of the hostname buffer
- * @param port_ptr a pointer to store the port number in
- * @param path the buffer for the path
- * @param path_size the size of the path buffer
- * @param url the URL to split
- */
-void av_url_split(char *proto, int proto_size,
- char *authorization, int authorization_size,
- char *hostname, int hostname_size,
- int *port_ptr,
- char *path, int path_size,
- const char *url);
-
-
-/**
- * Print detailed information about the input or output format, such as
- * duration, bitrate, streams, container, programs, metadata, side data,
- * codec and time base.
- *
- * @param ic the context to analyze
- * @param index index of the stream to dump information about
- * @param url the URL to print, such as source or destination file
- * @param is_output Select whether the specified context is an input(0) or output(1)
- */
-void av_dump_format(AVFormatContext *ic,
- int index,
- const char *url,
- int is_output);
-
-/**
- * Return in 'buf' the path with '%d' replaced by a number.
- *
- * Also handles the '%0nd' format where 'n' is the total number
- * of digits and '%%'.
- *
- * @param buf destination buffer
- * @param buf_size destination buffer size
- * @param path numbered sequence string
- * @param number frame number
- * @return 0 if OK, -1 on format error
- */
-int av_get_frame_filename(char *buf, int buf_size,
- const char *path, int number);
-
-/**
- * Check whether filename actually is a numbered sequence generator.
- *
- * @param filename possible numbered sequence string
- * @return 1 if a valid numbered sequence string, 0 otherwise
- */
-int av_filename_number_test(const char *filename);
-
-/**
- * Generate an SDP for an RTP session.
- *
- * Note, this overwrites the id values of AVStreams in the muxer contexts
- * for getting unique dynamic payload types.
- *
- * @param ac array of AVFormatContexts describing the RTP streams. If the
- * array is composed by only one context, such context can contain
- * multiple AVStreams (one AVStream per RTP stream). Otherwise,
- * all the contexts in the array (an AVCodecContext per RTP stream)
- * must contain only one AVStream.
- * @param n_files number of AVCodecContexts contained in ac
- * @param buf buffer where the SDP will be stored (must be allocated by
- * the caller)
- * @param size the size of the buffer
- * @return 0 if OK, AVERROR_xxx on error
- */
-int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
-
-/**
- * Return a positive value if the given filename has one of the given
- * extensions, 0 otherwise.
- *
- * @param filename file name to check against the given extensions
- * @param extensions a comma-separated list of filename extensions
- */
-int av_match_ext(const char *filename, const char *extensions);
-
-/**
- * Test if the given container can store a codec.
- *
- * @param ofmt container to check for compatibility
- * @param codec_id codec to potentially store in container
- * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
- *
- * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
- * A negative number if this information is not available.
- */
-int avformat_query_codec(const AVOutputFormat *ofmt, enum AVCodecID codec_id,
- int std_compliance);
-
-/**
- * @defgroup riff_fourcc RIFF FourCCs
- * @{
- * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
- * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
- * following code:
- * @code
- * uint32_t tag = MKTAG('H', '2', '6', '4');
- * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
- * enum AVCodecID id = av_codec_get_id(table, tag);
- * @endcode
- */
-/**
- * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
- */
-const struct AVCodecTag *avformat_get_riff_video_tags(void);
-/**
- * @return the table mapping RIFF FourCCs for audio to AVCodecID.
- */
-const struct AVCodecTag *avformat_get_riff_audio_tags(void);
-/**
- * @return the table mapping MOV FourCCs for video to libavcodec AVCodecID.
- */
-const struct AVCodecTag *avformat_get_mov_video_tags(void);
-/**
- * @return the table mapping MOV FourCCs for audio to AVCodecID.
- */
-const struct AVCodecTag *avformat_get_mov_audio_tags(void);
-
-/**
- * @}
- */
-
-/**
- * Guess the sample aspect ratio of a frame, based on both the stream and the
- * frame aspect ratio.
- *
- * Since the frame aspect ratio is set by the codec but the stream aspect ratio
- * is set by the demuxer, these two may not be equal. This function tries to
- * return the value that you should use if you would like to display the frame.
- *
- * Basic logic is to use the stream aspect ratio if it is set to something sane
- * otherwise use the frame aspect ratio. This way a container setting, which is
- * usually easy to modify can override the coded value in the frames.
- *
- * @param format the format context which the stream is part of
- * @param stream the stream which the frame is part of
- * @param frame the frame with the aspect ratio to be determined
- * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
- */
-AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame);
-
-/**
- * Guess the frame rate, based on both the container and codec information.
- *
- * @param ctx the format context which the stream is part of
- * @param stream the stream which the frame is part of
- * @param frame the frame for which the frame rate should be determined, may be NULL
- * @return the guessed (valid) frame rate, 0/1 if no idea
- */
-AVRational av_guess_frame_rate(AVFormatContext *ctx, AVStream *stream, AVFrame *frame);
-
-/**
- * Check if the stream st contained in s is matched by the stream specifier
- * spec.
- *
- * See the "stream specifiers" chapter in the documentation for the syntax
- * of spec.
- *
- * @return >0 if st is matched by spec;
- * 0 if st is not matched by spec;
- * AVERROR code if spec is invalid
- *
- * @note A stream specifier can match several streams in the format.
- */
-int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
- const char *spec);
-
-int avformat_queue_attached_pictures(AVFormatContext *s);
-
-/**
- * Apply a list of bitstream filters to a packet.
- *
- * @param codec AVCodecContext, usually from an AVStream
- * @param pkt the packet to apply filters to
- * @param bsfc a NULL-terminated list of filters to apply
- * @return >=0 on success;
- * AVERROR code on failure
- */
-int av_apply_bitstream_filters(AVCodecContext *codec, AVPacket *pkt,
- AVBitStreamFilterContext *bsfc);
-
-/**
- * @}
- */
-
-#endif /* AVFORMAT_AVFORMAT_H */
projects / rtmpclient.git / blobdiff