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/*
* copyright ( c ) 2001 Fabrice Bellard
*
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* This file is part of Libav .
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*
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* Libav is free software ; you can redistribute it and / or
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation ; either
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* version 2.1 of the License , or ( at your option ) any later version .
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*
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* Libav is distributed in the hope that it will be useful ,
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* 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
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* License along with Libav ; if not , write to the Free Software
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* Foundation , Inc . , 51 Franklin Street , Fifth Floor , Boston , MA 02110 - 1301 USA
*/
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# ifndef AVFORMAT_AVFORMAT_H
# define AVFORMAT_AVFORMAT_H
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/**
* @ file
* @ ingroup libavf
* Main libavformat public API header
*/
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/**
* @ defgroup libavf I / O and Muxing / Demuxing Library
* @ {
*
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* 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 Libav 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 ) .
*
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* @ section lavf_options Passing options to ( de ) muxers
* Lavf allows to configure 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 .
*
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* @ defgroup lavf_decoding Demuxing
* @ {
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* Demuxers read a media file and split it into chunks of data ( @ em packets ) . A
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* @ 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
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* 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 .
*
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* 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
*
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* 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
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* 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 .
*
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* If AVPacket . buf is set on the returned packet , then the packet is
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* allocated dynamically and the user may keep it indefinitely .
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* Otherwise , if AVPacket . buf is NULL , the packet data is backed by a
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* 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 .
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* In both cases , the packet must be freed with av_packet_unref ( ) when it is no
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* longer needed .
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*
* @ section lavf_decoding_seek Seeking
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* @ }
*
* @ defgroup lavf_encoding Muxing
* @ {
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* 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 ,
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* etc . ) as known . The @ ref AVStream . time_base " stream timebase " should
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* 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 ) .
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* - 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 .
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* - 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
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* avformat_write_header ( ) step ) and may be different from the timebase
* requested by the caller .
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*
* 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 ( ) .
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* @ }
*
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* @ defgroup lavf_io I / O Read / Write
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* @ {
* @ }
*
* @ 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
* @ {
* @ }
* @ }
*
*/
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# include <time.h>
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# include <stdio.h> /* FILE */
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# include "libavcodec/avcodec.h"
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# include "libavutil/dict.h"
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# include "libavutil/log.h"
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# include "avio.h"
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# include "libavformat/version.h"
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struct AVFormatContext ;
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/**
* @ defgroup metadata_api Public Metadata API
* @ {
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* @ ingroup libavf
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* The metadata API allows libavformat to export metadata tags to a client
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* 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 Libav ,
* metadata is assumed to be UTF - 8 encoded Unicode . Note that metadata
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* exported by demuxers isn ' t checked to be valid UTF - 8 in most cases .
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*
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* Important concepts to keep in mind :
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* - Keys are unique ; there can never be 2 tags with the same key . This is
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* 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 .
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* - Metadata is flat , not hierarchical ; there are no subtags . If you
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* 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 .
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* - Several modifiers can be applied to the tag name . This is done by
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* 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 .
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* - language - - a tag whose value is localized for a particular language
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* 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 .
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* - sorting - - a modified version of a tag that should be used for
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* sorting will have ' - sort ' appended . E . g . artist = " The Beatles " ,
* artist - sort = " Beatles, The " .
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* - 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 .
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*
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* - Demuxers attempt to export metadata in a generic format , however tags
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* with no generic equivalents are left as they are stored in the container .
* Follows a list of generic tag names :
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*
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@ 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
*
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* Look in the examples section for an application example how to use the Metadata API .
*
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* @ }
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*/
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/* packet functions */
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/**
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* Allocate and read the payload of a packet and initialize its
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* fields with default values .
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*
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* @ param s associated IO context
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* @ param pkt packet
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* @ param size desired payload size
* @ return > 0 ( read size ) if OK , AVERROR_xxx otherwise
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*/
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int av_get_packet ( AVIOContext * s , AVPacket * pkt , int size ) ;
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/**
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* Read data and append it to the current content of the AVPacket .
* If pkt - > size is 0 this is identical to av_get_packet .
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* 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 .
*
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* @ param s associated IO context
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* @ 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 .
*/
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int av_append_packet ( AVIOContext * s , AVPacket * pkt , int size ) ;
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# if FF_API_LAVF_FRAC
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/*************************************************/
/* fractional numbers for exact pts handling */
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/**
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* The exact value of the fractional number is : ' val + num / den ' .
* num is assumed to be 0 < = num < den .
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*/
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typedef struct AVFrac {
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int64_t val , num , den ;
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} AVFrac ;
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# endif
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/*************************************************/
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/* input/output formats */
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struct AVCodecTag ;
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/**
* This structure contains the data a format has to probe a file .
*/
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typedef struct AVProbeData {
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const char * filename ;
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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 */
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const char * mime_type ; /**< mime_type, when known. */
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} AVProbeData ;
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# define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
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# define AVPROBE_SCORE_MIME 75 ///< score for file mime type
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# define AVPROBE_SCORE_MAX 100 ///< maximum score
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# define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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/// Demuxer will use avio_open, no opened file should be provided by the caller.
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# define AVFMT_NOFILE 0x0001
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# define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
# define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
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# if FF_API_LAVF_FMT_RAWPICTURE
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# define AVFMT_RAWPICTURE 0x0020 / **< Format wants AVPicture structure for
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raw picture data . @ deprecated Not used anymore */
# endif
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# 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. */
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# define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
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# define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
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# define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
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# define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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# 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 */
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# define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
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# define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
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# define AVFMT_TS_NONSTRICT 0x20000 / **< Format does not require strictly
increasing timestamps , but they must
still be monotonic */
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# 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. */
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/**
* @ addtogroup lavf_encoding
* @ {
*/
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typedef struct AVOutputFormat {
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const char * name ;
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/**
* Descriptive name for the format , meant to be more human - readable
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* than name . You should use the NULL_IF_CONFIG_SMALL ( ) macro
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* to define it .
*/
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const char * long_name ;
const char * mime_type ;
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const char * extensions ; /**< comma-separated filename extensions */
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/* output support */
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enum AVCodecID audio_codec ; /**< default audio codec */
enum AVCodecID video_codec ; /**< default video codec */
enum AVCodecID subtitle_codec ; /**< default subtitle codec */
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/**
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* can use flags : AVFMT_NOFILE , AVFMT_NEEDNUMBER ,
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* AVFMT_GLOBALHEADER , AVFMT_NOTIMESTAMPS , AVFMT_VARIABLE_FPS ,
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* AVFMT_NODIMENSIONS , AVFMT_NOSTREAMS , AVFMT_ALLOW_FLUSH ,
* AVFMT_TS_NONSTRICT
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*/
int flags ;
/**
* List of supported codec_id - codec_tag pairs , ordered by " better
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* choice first " . The arrays are all terminated by AV_CODEC_ID_NONE.
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*/
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 ;
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/**
* size of private data so that it can be allocated in the wrapper
*/
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int priv_data_size ;
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int ( * write_header ) ( struct AVFormatContext * ) ;
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/**
* 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 .
*/
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int ( * write_packet ) ( struct AVFormatContext * , AVPacket * pkt ) ;
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int ( * write_trailer ) ( struct AVFormatContext * ) ;
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/**
* Currently only used to set pixel format if not YUV420P .
*/
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int ( * interleave_packet ) ( struct AVFormatContext * , AVPacket * out ,
AVPacket * in , int flush ) ;
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/**
* 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 .
*/
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int ( * query_codec ) ( enum AVCodecID id , int std_compliance ) ;
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} AVOutputFormat ;
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/**
* @ }
*/
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/**
* @ addtogroup lavf_decoding
* @ {
*/
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typedef struct AVInputFormat {
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/**
* A comma separated list of short names for the format . New names
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* may be appended with a minor bump .
*/
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const char * name ;
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/**
* Descriptive name for the format , meant to be more human - readable
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* than name . You should use the NULL_IF_CONFIG_SMALL ( ) macro
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* to define it .
*/
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const char * long_name ;
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/**
* Can use flags : AVFMT_NOFILE , AVFMT_NEEDNUMBER , AVFMT_SHOW_IDS ,
* AVFMT_GENERIC_INDEX , AVFMT_TS_DISCONT , AVFMT_NOBINSEARCH ,
* AVFMT_NOGENSEARCH , AVFMT_NO_BYTE_SEEK .
*/
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
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/**
* 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 ;
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/*****************************************************************
* 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 ;
/**
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* Raw demuxers store their codec ID here .
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*/
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int raw_codec_id ;
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/**
* Size of private data so that it can be allocated in the wrapper .
*/
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int priv_data_size ;
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/**
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* Tell if a given file has a chance of being parsed as this format .
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* 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 .
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*/
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int ( * read_probe ) ( AVProbeData * ) ;
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/**
* Read the format header and initialize the AVFormatContext
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* structure . Return 0 if OK . ' avformat_new_stream ' should be
* called to create new streams .
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*/
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int ( * read_header ) ( struct AVFormatContext * ) ;
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/**
* Read one packet and put it in ' pkt ' . pts and flags are also
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* set . ' avformat_new_stream ' can be called only if the flag
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* AVFMTCTX_NOHEADER is used and only in the calling thread ( not in a
* background thread ) .
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* @ return 0 on success , < 0 on error .
* When returning an error , pkt must not have been allocated
* or must be freed before returning
*/
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int ( * read_packet ) ( struct AVFormatContext * , AVPacket * pkt ) ;
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/**
* Close the stream . The AVFormatContext and AVStreams are not
* freed by this function
*/
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int ( * read_close ) ( struct AVFormatContext * ) ;
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/**
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* Seek to a given timestamp relative to the frames in
* stream component stream_index .
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* @ param stream_index Must not be - 1.
* @ param flags Selects which direction should be preferred if no exact
* match is available .
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* @ return > = 0 on success ( but not necessarily the new offset )
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*/
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int ( * read_seek ) ( struct AVFormatContext * ,
int stream_index , int64_t timestamp , int flags ) ;
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/**
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* Get the next timestamp in stream [ stream_index ] . time_base units .
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* @ return the timestamp or AV_NOPTS_VALUE if an error occurred
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*/
int64_t ( * read_timestamp ) ( struct AVFormatContext * s , int stream_index ,
int64_t * pos , int64_t pos_limit ) ;
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/**
* Start / resume playing - only meaningful if using a network - based format
* ( RTSP ) .
*/
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int ( * read_play ) ( struct AVFormatContext * ) ;
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/**
* Pause playing - only meaningful if using a network - based format
* ( RTSP ) .
*/
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int ( * read_pause ) ( struct AVFormatContext * ) ;
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/**
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* Seek to timestamp ts .
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* 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 .
*/
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int ( * read_seek2 ) ( struct AVFormatContext * s , int stream_index , int64_t min_ts , int64_t ts , int64_t max_ts , int flags ) ;
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} AVInputFormat ;
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/**
* @ }
*/
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enum AVStreamParseType {
AVSTREAM_PARSE_NONE ,
AVSTREAM_PARSE_FULL , /**< full parsing and repack */
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AVSTREAM_PARSE_HEADERS , /**< Only parse headers, do not repack. */
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AVSTREAM_PARSE_TIMESTAMPS , /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
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AVSTREAM_PARSE_FULL_ONCE , /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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} ;
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typedef struct AVIndexEntry {
int64_t pos ;
int64_t timestamp ;
# define AVINDEX_KEYFRAME 0x0001
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int flags : 2 ;
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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. */
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} AVIndexEntry ;
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# 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
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/**
* 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 .
*/
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# define AV_DISPOSITION_FORCED 0x0040
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# define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
# define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
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# define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
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/**
* 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
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typedef struct AVStreamInternal AVStreamInternal ;
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/**
* Stream structure .
* New fields can be added to the end with minor version bumps .
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* Removal , reordering and changes to existing fields require a major
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* version bump .
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* sizeof ( AVStream ) must not be used outside libav * .
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*/
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typedef struct AVStream {
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int index ; /**< stream index in AVFormatContext */
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/**
* Format - specific stream ID .
* decoding : set by libavformat
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* encoding : set by the user , replaced by libavformat if left unset
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*/
int id ;
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/**
* 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 ;
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void * priv_data ;
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# if FF_API_LAVF_FRAC
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/**
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* @ deprecated this field is unused
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*/
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attribute_deprecated
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struct AVFrac pts ;
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# endif
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/**
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* This is the fundamental unit of time ( in seconds ) in terms
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* of which frame timestamps are represented .
*
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* decoding : set by libavformat
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* 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 ) .
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*/
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AVRational time_base ;
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/**
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* Decoding : pts of the first frame of the stream , 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 .
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* This may be undefined ( AV_NOPTS_VALUE ) .
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*/
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int64_t start_time ;
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/**
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* Decoding : duration of the stream , in stream time base .
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* If a source file does not specify a duration , but does specify
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* a bitrate , this value will be estimated from bitrate and file size .
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*/
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int64_t duration ;
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int64_t nb_frames ; ///< number of frames in this stream if known or 0
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int disposition ; /**< AV_DISPOSITION_* bit field */
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enum AVDiscard discard ; ///< Selects which packets can be discarded at will and do not need to be demuxed.
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/**
* sample aspect ratio ( 0 if unknown )
* - encoding : Set by user .
* - decoding : Set by libavformat .
*/
AVRational sample_aspect_ratio ;
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AVDictionary * metadata ;
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/**
* Average framerate
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*
* - 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 ( ) .
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*/
AVRational avg_frame_rate ;
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/**
* 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 ;
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/**
* 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 ( ) .
*/
AVPacketSideData * side_data ;
/**
* The number of elements in the AVStream . side_data array .
*/
int nb_side_data ;
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/**
* 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.
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/*****************************************************************
* 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 .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
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/**
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* Stream information used internally by av_find_stream_info ( )
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*/
# define MAX_STD_TIMEBASES (60*12+5)
struct {
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int nb_decoded_frames ;
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int found_decoder ;
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/**
* 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 ;
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} * info ;
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int pts_wrap_bits ; /**< number of bits in pts (used for wrapping control) */
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// Timestamp generation support:
int64_t first_dts ;
int64_t cur_dts ;
int64_t last_IP_pts ;
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int last_IP_duration ;
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/**
* Number of packets to buffer for codec probing
*/
# define MAX_PROBE_PACKETS 2500
int probe_packets ;
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/**
* 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 ;
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/**
* 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 ;
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/**
* An opaque field for libavformat internal usage .
* Must not be accessed in any way by callers .
*/
AVStreamInternal * internal ;
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} AVStream ;
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# define AV_PROGRAM_RUNNING 1
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/**
* New fields can be added to the end with minor version bumps .
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* Removal , reordering and changes to existing fields require a major
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* version bump .
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* sizeof ( AVProgram ) must not be used outside libav * .
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*/
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typedef struct AVProgram {
int id ;
int flags ;
enum AVDiscard discard ; ///< selects which program to discard and which to feed to the caller
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unsigned int * stream_index ;
unsigned int nb_stream_indexes ;
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AVDictionary * metadata ;
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} AVProgram ;
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# define AVFMTCTX_NOHEADER 0x0001 / **< signal that no header is present
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( streams are added dynamically ) */
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typedef struct AVChapter {
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int id ; ///< unique ID to identify the chapter
AVRational time_base ; ///< time base in which the start/end timestamps are specified
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int64_t start , end ; ///< chapter start/end time in time_base units
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AVDictionary * metadata ;
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} AVChapter ;
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typedef struct AVFormatInternal AVFormatInternal ;
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/**
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* Format I / O context .
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* New fields can be added to the end with minor version bumps .
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* Removal , reordering and changes to existing fields require a major
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* version bump .
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* sizeof ( AVFormatContext ) must not be used outside libav * , use
* avformat_alloc_context ( ) to create an AVFormatContext .
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*/
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typedef struct AVFormatContext {
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/**
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* A class for logging and @ ref avoptions . Set by avformat_alloc_context ( ) .
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* Exports ( de ) muxer private options if they exist .
*/
const AVClass * av_class ;
/**
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* The input container format .
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*
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* Demuxing only , set by avformat_open_input ( ) .
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*/
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struct AVInputFormat * iformat ;
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/**
* The output container format .
*
* Muxing only , must be set by the caller before avformat_write_header ( ) .
*/
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struct AVOutputFormat * oformat ;
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/**
* Format private data . This is an AVOptions - enabled struct
* if and only if iformat / oformat . priv_class is not NULL .
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*
* - muxing : set by avformat_write_header ( )
* - demuxing : set by avformat_open_input ( )
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*/
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void * priv_data ;
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/**
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* I / O context .
*
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* - 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 .
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*
* 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 .
*/
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AVIOContext * pb ;
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/* stream info */
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/**
* Flags signalling stream properties . A combination of AVFMTCTX_ * .
* Set by libavformat .
*/
int ctx_flags ;
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/**
* Number of elements in AVFormatContext . streams .
*
* Set by avformat_new_stream ( ) , must not be modified by any other code .
*/
unsigned int nb_streams ;
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/**
* A list of all streams in the file . New streams are created with
* avformat_new_stream ( ) .
*
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* - 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 ( ) .
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*/
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AVStream * * streams ;
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/**
* input or output filename
*
* - demuxing : set by avformat_open_input ( )
* - muxing : may be set by the caller before avformat_write_header ( )
*/
char filename [ 1024 ] ;
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/**
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* Position of the first frame of the component , in
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* AV_TIME_BASE fractional seconds . NEVER set this value directly :
* It is deduced from the AVStream values .
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*
* Demuxing only , set by libavformat .
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*/
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int64_t start_time ;
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/**
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* Duration of the stream , in AV_TIME_BASE fractional
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* seconds . Only set this value if you know none of the individual stream
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* durations and also do not set any of them . This is deduced from the
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* AVStream values if not set .
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*
* Demuxing only , set by libavformat .
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*/
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int64_t duration ;
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/**
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* Total stream bitrate in bit / s , 0 if not
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* available . Never set it directly if the file_size and the
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* duration are known as Libav can compute it automatically .
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*/
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int bit_rate ;
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unsigned int packet_size ;
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int max_delay ;
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/**
* Flags modifying the ( de ) muxer behaviour . A combination of AVFMT_FLAG_ * .
* Set by the user before avformat_open_input ( ) / avformat_write_header ( ) .
*/
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int flags ;
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# define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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# define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
# define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
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# define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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# 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
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# define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
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# define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
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# define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
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# define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
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/**
* 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
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/**
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* Maximum size of the data read from input for determining
* the input container format .
* Demuxing only , set by the caller before avformat_open_input ( ) .
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*/
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unsigned int probesize ;
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/**
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* 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 ( ) .
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*/
int max_analyze_duration ;
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const uint8_t * key ;
int keylen ;
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unsigned int nb_programs ;
AVProgram * * programs ;
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/**
* Forced video codec_id .
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* Demuxing : Set by user .
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*/
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enum AVCodecID video_codec_id ;
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/**
* Forced audio codec_id .
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* Demuxing : Set by user .
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*/
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enum AVCodecID audio_codec_id ;
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/**
* Forced subtitle codec_id .
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* Demuxing : Set by user .
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*/
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enum AVCodecID subtitle_codec_id ;
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/**
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* 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
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* needed to maintain a smaller size . This can lead to slower or less
* accurate seeking ( depends on demuxer ) .
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* Demuxers for which a full in - memory index is mandatory will ignore
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* this .
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* - muxing : unused
* - demuxing : set by user
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*/
unsigned int max_index_size ;
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/**
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* Maximum amount of memory in bytes to use for buffering frames
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* obtained from realtime capture devices .
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*/
unsigned int max_picture_buffer ;
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/**
* 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 .
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* - muxing : set by user
* - demuxing : set by libavformat
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*/
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unsigned int nb_chapters ;
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AVChapter * * chapters ;
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/**
* 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 ( ) .
*/
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AVDictionary * metadata ;
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/**
* Start time of the stream in real world time , in microseconds
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* since the Unix epoch ( 00 : 00 1 st January 1970 ) . That is , pts = 0 in the
* stream was captured at this real world time .
* Muxing only , set by the caller before avformat_write_header ( ) .
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*/
int64_t start_time_realtime ;
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/**
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* 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 ( ) .
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*/
int fps_probe_size ;
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/**
* Error recognition ; higher values will detect more errors but may
* misdetect some more or less valid parts as errors .
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* Demuxing only , set by the caller before avformat_open_input ( ) .
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*/
int error_recognition ;
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/**
* Custom interrupt callbacks for the I / O layer .
*
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* demuxing : set by the user before avformat_open_input ( ) .
* muxing : set by the user before avformat_write_header ( )
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* ( 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 ;
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/**
* Flags to enable debugging .
*/
int debug ;
# define FF_FDEBUG_TS 0x0001
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/**
* 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 ;
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/**
* Allow non - standard and experimental extension
* @ see AVCodecContext . strict_std_compliance
*/
int strict_std_compliance ;
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/**
* 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.
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/**
* Maximum number of packets to read while waiting for the first timestamp .
* Decoding only .
*/
int max_ts_probe ;
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/**
* Avoid negative timestamps during muxing .
* Any value of the AVFMT_AVOID_NEG_TS_ * constants .
* Note , this only works when using av_interleaved_write_frame .
* - 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
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/**
* An opaque field for libavformat internal usage .
* Must not be accessed in any way by callers .
*/
AVFormatInternal * internal ;
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} AVFormatContext ;
typedef struct AVPacketList {
AVPacket pkt ;
struct AVPacketList * next ;
} AVPacketList ;
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/**
* @ 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 ( )
* @ see av_register_protocol ( )
*/
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 ) ;
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/**
* If f is NULL , returns the first registered input format ,
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* if f is non - NULL , returns the next registered input format after f
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* or NULL if f is the last one .
*/
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AVInputFormat * av_iformat_next ( const AVInputFormat * f ) ;
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/**
* If f is NULL , returns the first registered output format ,
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* if f is non - NULL , returns the next registered output format after f
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* or NULL if f is the last one .
*/
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AVOutputFormat * av_oformat_next ( const AVOutputFormat * f ) ;
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/**
* 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 ( ) .
*
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* @ param s media file handle
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* @ 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 .
*/
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AVStream * avformat_new_stream ( AVFormatContext * s , const AVCodec * c ) ;
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/**
* 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 ) ;
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AVProgram * av_new_program ( AVFormatContext * s , int id ) ;
/**
* @ }
*/
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/**
* @ addtogroup lavf_decoding
* @ {
*/
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/**
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* Find AVInputFormat based on the short name of the input format .
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*/
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AVInputFormat * av_find_input_format ( const char * short_name ) ;
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/**
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* Guess the file format .
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*
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* @ param pd data to be probed
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* @ param is_opened Whether the file is already opened ; determines whether
* demuxers with or without AVFMT_NOFILE are probed .
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*/
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AVInputFormat * av_probe_input_format ( AVProbeData * pd , int is_opened ) ;
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/**
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* Guess the file format .
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*
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* @ param pd data to be probed
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* @ param is_opened Whether the file is already opened ; determines whether
* demuxers with or without AVFMT_NOFILE are probed .
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* @ 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
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* to retry with a larger probe buffer .
*/
AVInputFormat * av_probe_input_format2 ( AVProbeData * pd , int is_opened , int * score_max ) ;
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/**
* 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 0 in case of success , a negative value corresponding to an
* AVERROR code otherwise
*/
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int av_probe_input_buffer ( AVIOContext * pb , AVInputFormat * * fmt ,
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const char * filename , void * logctx ,
unsigned int offset , unsigned int max_probe_size ) ;
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/**
* Open an input stream and read the header . The codecs are not opened .
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* The stream must be closed with avformat_close_input ( ) .
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*
* @ 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 ) ;
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/**
* 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 ) ;
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/**
* 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 ) ;
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/**
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* Return the next frame of a stream .
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* 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 .
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*
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* If pkt - > buf is NULL , then the packet is valid until the next
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* av_read_frame ( ) or until avformat_close_input ( ) . Otherwise the packet
* is valid indefinitely . In both cases the packet must be freed with
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* av_packet_unref when it is no longer needed . For video , the packet contains
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* 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 .
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*
* pkt - > pts , pkt - > dts and pkt - > duration are always set to correct
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* values in AVStream . time_base units ( and guessed if the format cannot
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* 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
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* decompress the payload .
*
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* @ return 0 if OK , < 0 on error or end of file
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*/
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int av_read_frame ( AVFormatContext * s , AVPacket * pkt ) ;
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/**
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* Seek to the keyframe at timestamp .
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* ' timestamp ' in ' stream_index ' .
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*
* @ param s media file handle
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* @ 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 .
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* @ param timestamp Timestamp in AVStream . time_base units
* or , if no stream is specified , in AV_TIME_BASE units .
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* @ param flags flags which select direction and seeking mode
* @ return > = 0 on success
*/
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int av_seek_frame ( AVFormatContext * s , int stream_index , int64_t timestamp ,
int flags ) ;
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/**
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* Seek to timestamp ts .
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* 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 .
*
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* If flags contain AVSEEK_FLAG_BYTE , then all timestamps are in bytes and
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* are the file position ( this may not be supported by all demuxers ) .
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* If flags contain AVSEEK_FLAG_FRAME , then all timestamps are in frames
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* in the stream with stream_index ( this may not be supported by all demuxers ) .
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* 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
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* keyframes ( this may not be supported by all demuxers ) .
*
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* @ param s media file handle
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* @ param stream_index index of the stream which is used as time base reference
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* @ param min_ts smallest acceptable timestamp
* @ param ts target timestamp
* @ param max_ts largest acceptable timestamp
* @ param flags flags
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* @ return > = 0 on success , error code otherwise
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*
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* @ note This is part of the new seek API which is still under construction .
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* Thus do not use this yet . It may change at any time , do not expect
* ABI compatibility yet !
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*/
int avformat_seek_file ( AVFormatContext * s , int stream_index , int64_t min_ts , int64_t ts , int64_t max_ts , int flags ) ;
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/**
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* Start playing a network - based stream ( e . g . RTSP stream ) at the
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* current position .
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*/
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int av_read_play ( AVFormatContext * s ) ;
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/**
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* Pause a network - based stream ( e . g . RTSP stream ) .
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*
* Use av_read_play ( ) to resume it .
*/
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int av_read_pause ( AVFormatContext * s ) ;
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/**
* Close an opened input AVFormatContext . Free it and all its contents
* and set * s to NULL .
*/
void avformat_close_input ( AVFormatContext * * s ) ;
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/**
* @ }
*/
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# define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
# define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
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# define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
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# define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
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/**
* @ addtogroup lavf_encoding
* @ {
*/
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/**
* 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 ;
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* Its pb field must be set to an already opened AVIOContext .
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* @ 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 .
*/
int avformat_write_header ( AVFormatContext * s , AVDictionary * * options ) ;
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/**
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* Write a packet to an output media file .
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*
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* 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 .
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*
* @ param s media file handle
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* @ param pkt The packet containing the data to be written . Note that unlike
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* 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 ) .
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* < br >
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* 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 .
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* < br >
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* Packet ' s @ ref AVPacket . stream_index " stream_index " field must be
* set to the index of the corresponding stream in @ ref
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* 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 .
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* @ return < 0 on error , = 0 if OK , 1 if flushed and there is no more data to flush
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*
* @ see av_interleaved_write_frame ( )
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*/
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int av_write_frame ( AVFormatContext * s , AVPacket * pkt ) ;
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/**
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* Write a packet to an output media file ensuring correct interleaving .
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*
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* 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 .
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*
* @ param s media file handle
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* @ param pkt The packet containing the data to be written .
* < br >
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* 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 .
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* < br >
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* This parameter can be NULL ( at any time , not just at the end ) , to
* flush the interleaving queues .
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* < br >
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* Packet ' s @ ref AVPacket . stream_index " stream_index " field must be
* set to the index of the corresponding stream in @ ref
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* 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 .
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*
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* @ return 0 on success , a negative AVERROR on error . Libavformat will always
* take care of freeing the packet , even if this function fails .
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*
* @ see av_write_frame ( ) , AVFormatContext . max_interleave_delta
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*/
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int av_interleaved_write_frame ( AVFormatContext * s , AVPacket * pkt ) ;
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/**
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* Write the stream trailer to an output media file and free the
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* file private data .
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*
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* May only be called after a successful call to avformat_write_header .
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*
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* @ param s media file handle
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* @ return 0 if OK , AVERROR_xxx on error
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*/
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int av_write_trailer ( AVFormatContext * s ) ;
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/**
* 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 .
*/
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enum AVCodecID av_guess_codec ( AVOutputFormat * fmt , const char * short_name ,
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const char * filename , const char * mime_type ,
enum AVMediaType type ) ;
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/**
* @ }
*/
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/**
* @ defgroup lavf_misc Utility functions
* @ ingroup libavf
* @ {
*
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* Miscellaneous utility functions related to both muxing and demuxing
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* ( 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
*/
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void av_hex_dump ( FILE * f , const uint8_t * buf , int size ) ;
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/**
* 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
*/
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void av_hex_dump_log ( void * avcl , int level , const uint8_t * buf , int size ) ;
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/**
* 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 , AVPacket * pkt , int dump_payload , 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 , AVPacket * pkt , int dump_payload ,
AVStream * st ) ;
/**
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* Get the AVCodecID for the given codec tag tag .
* If no codec id is found returns AV_CODEC_ID_NONE .
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*
* @ param tags list of supported codec_id - codec_tag pairs , as stored
* in AVInputFormat . codec_tag and AVOutputFormat . codec_tag
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* @ param tag codec tag to match to a codec ID
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*/
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enum AVCodecID av_codec_get_id ( const struct AVCodecTag * const * tags , unsigned int tag ) ;
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/**
* 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
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* @ param id codec ID to match to a codec tag
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*/
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unsigned int av_codec_get_tag ( const struct AVCodecTag * const * tags , enum AVCodecID id ) ;
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int av_find_default_stream_index ( AVFormatContext * s ) ;
/**
* Get the index for a specific timestamp .
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*
* @ param st stream that the timestamp belongs to
* @ param timestamp timestamp to retrieve the index for
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* @ 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 ) ;
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2014-06-08 15:56:34 +00:00
/**
* 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 the index to print , if you have multiple inputs or outputs
* @ param url the URL to print , such as source or destination file
* @ param is_output whether the context is input or ouput
*/
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void av_dump_format ( AVFormatContext * ic ,
int index ,
const char * url ,
int is_output ) ;
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/**
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* Return in ' buf ' the path with ' % d ' replaced by a number .
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*
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* Also handles the ' % 0 nd ' 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
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* @ param number frame number
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* @ return 0 if OK , - 1 on format error
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*/
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int av_get_frame_filename ( char * buf , int buf_size ,
const char * path , int number ) ;
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/**
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* Check whether filename actually is a numbered sequence generator .
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*
* @ param filename possible numbered sequence string
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* @ return 1 if a valid numbered sequence string , 0 otherwise
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*/
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int av_filename_number_test ( const char * filename ) ;
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/**
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* Generate an SDP for an RTP session .
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*
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* Note , this overwrites the id values of AVStreams in the muxer contexts
* for getting unique dynamic payload types .
*
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* @ 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 )
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* must contain only one AVStream .
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* @ param n_files number of AVCodecContexts contained in ac
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* @ param buf buffer where the SDP will be stored ( must be allocated by
* the caller )
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* @ param size the size of the buffer
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* @ return 0 if OK , AVERROR_xxx on error
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*/
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int av_sdp_create ( AVFormatContext * ac [ ] , int n_files , char * buf , int size ) ;
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/**
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* Return a positive value if the given filename has one of the given
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* extensions , 0 otherwise .
*
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* @ param filename file name to check against the given extensions
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* @ param extensions a comma - separated list of filename extensions
*/
int av_match_ext ( const char * filename , const char * extensions ) ;
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/**
* Test if the given container can store a codec .
*
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* @ param ofmt container to check for compatibility
* @ param codec_id codec to potentially store in container
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* @ 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 .
*/
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int avformat_query_codec ( const AVOutputFormat * ofmt , enum AVCodecID codec_id ,
int std_compliance ) ;
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/**
* @ defgroup riff_fourcc RIFF FourCCs
* @ {
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* Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs . The tables are
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* 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 } ;
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* enum AVCodecID id = av_codec_get_id ( table , tag ) ;
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* @ endcode
*/
/**
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* @ return the table mapping RIFF FourCCs for video to libavcodec AVCodecID .
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*/
const struct AVCodecTag * avformat_get_riff_video_tags ( void ) ;
/**
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* @ return the table mapping RIFF FourCCs for audio to AVCodecID .
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*/
const struct AVCodecTag * avformat_get_riff_audio_tags ( void ) ;
/**
* @ }
*/
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/**
* @ }
*/
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# endif /* AVFORMAT_AVFORMAT_H */