1f9139b07b
This solves the problem discussed in https://ffmpeg.org/pipermail/ffmpeg-devel/2015-September/179238.html by allowing AVCodec::write_header to be delayed until after packets have been run through required bitstream filters in order to generate global extradata. It also provides a mechanism by which a muxer can add a bitstream filter to a stream automatically, rather than prompting the user to do so.
2807 lines
106 KiB
C
2807 lines
106 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* @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 or filename, which
|
|
* is passed to avformat_open_input(), as in the following code:
|
|
* @code
|
|
* const char *url = "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+7+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.
|
|
* Mostly usable with control_message_cb or any future callbacks in device's context.
|
|
*/
|
|
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;
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
|
|
} 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);
|
|
AVOpenCallback av_format_get_open_cb(const AVFormatContext *s);
|
|
void av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback);
|
|
|
|
/**
|
|
* 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 filename the filename 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 *filename, 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 *filename, 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 filename Name 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 *filename, 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 */
|