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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<!-- Mirrored from dranger.com/ffmpeg/data.html by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 05 Jun 2020 09:18:43 GMT -->
<head>
<title>Data List</title>
<link href="ffmpeg.css" rel="stylesheet" type="text/css">
</head>
<body>
<h2 class="center">Data List</h2>
<div>
<a href="data.txt">Text version</a></div>
<a name="AVCodecContext">
<dl class="data">
<dt><a href="data.html#AVCodecContext">AVCodecContext</a> </dt>
<dd>
All the codec information from a stream, from <a href="data.html#AVStream">AVStream</a>->codec. Some important data members:
<p>
<b><a href="data.html#AVRational">AVRational</a> time_base</b>: frames per sec<br />
<b>int sample_rate</b>: samples per sec<br />
<b>int channels</b>: number of channels<br />
</p>
<p>
For a full list (this thing is huge), see <a href="http://www.irisa.fr/texmex/people/dufouil/ffmpegdoxy/structAVCodecContext.html">http://www.irisa.fr/texmex/people/dufouil/ffmpegdoxy/structAVCodecContext.html</a> Many of the options are used mostly for encoding rather than decoding.
</p>
</dd>
</a>
</dl>
<a name="AVFormatContext">
<dl class="data">
<dt><a href="data.html#AVFormatContext">AVFormatContext</a> </dt>
<dd>
Data fields:
<p>
<b>const AVClass * av_class</b> <br />
<b>AVInputFormat * iformat</b> <br />
<b>AVOutputFormat * oformat</b> <br />
<b>void * priv_data</b>: <br />
<b>ByteIOContext pb</b>: <a href="data.html#ByteIOContext">ByteIOContext</a> of the file, used for the low level file manipulation <br />
<b>unsigned int nb_streams</b>: Number of streams in the file<br />
<b>AVStream * streams [MAX_STREAMS]</b>: Stream data for each stream is stored here.<br />
<b>char filename [1024]</b>: duh<br />
<br />
<i>File Information</i><br />
<b>int64_t timestamp</b>: <br />
<b>char title [512]</b>: <br />
<b>char author [512]</b>: <br />
<b>char copyright [512]</b>: <br />
<b>char comment [512]</b>: <br />
<b>char album [512]</b>: <br />
<b>int year</b>: <br />
<b>int track</b>: <br />
<b>char genre [32]</b>: <br />
<br />
<b>int ctx_flags</b>: <br />
Any of AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS,
AVFMT_GENERIC_INDEX
<b>AVPacketList * packet_buffer</b>: This buffer is only needed when packets were already buffered but not decoded, for example to get the codec parameters in mpeg streams<br />
<b>int64_t start_time</b>: decoding: position of the first frame of the component, in AV_TIME_BASE fractional seconds. NEVER set this value directly: it is deduced from the AVStream values.<br />
<b>int64_t duration</b>: decoding: duration of the stream, in AV_TIME_BASE fractional seconds. NEVER set this value directly: it is deduced from the AVStream values.<br />
<b>int64_t file_size</b>: total file size, 0 if unknown<br />
<b>int bit_rate</b>: decoding: total stream bitrate in bit/s, 0 if not available. Never set it directly if the file_size and the duration are known as ffmpeg can compute it automatically.<br />
<b>AVStream * cur_st</b> <br />
<b>const uint8_t * cur_ptr</b> <br />
<b>int cur_len</b> <br />
<b>AVPacket cur_pkt</b>: <br />
<b>int64_t data_offset</b>: <br />
<b>int index_built</b>: offset of the first packet<br />
<b>int mux_rate</b>: <br />
<b>int packet_size</b>: <br />
<b>int preload</b>: <br />
<b>int max_delay</b>: <br />
<b>int loop_output</b>: number of times to loop output in formats that support it<br />
<b>int flags</b>: <br />
<b>int loop_input</b>: <br />
<b>unsigned int probesize</b>: decoding: size of data to probe; encoding unused<br />
<b>int max_analyze_duration</b>: maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()<br />
<b>const uint8_t * key</b>: <br />
<b>int keylen</b>: <br />
</p>
</dd>
</a>
</dl>
<a name="AVIOContext">
<dl class="data">
<dt>AVIOContext</dt>
<dd>
An IO Context to access resources.
<p>
<b>const AVClass * av_class</b>
A class for private options.<br />
<b>unsigned char * buffer</b>
Start of the buffer.<br />
<b>int buffer_size</b>
Maximum buffer size.<br />
<b>unsigned char * buf_ptr</b>
Current position in the buffer.<br />
<b>unsigned char * buf_end</b>
End of the data, may be less than buffer+buffer_size if the read function returned less data than requested, e.g.
<br />
<b>void * opaque</b>
A private pointer, passed to the read/write/seek/...
<br />
<b>int(* read_packet )(void *opaque, uint8_t *buf, int buf_size)</b>
<br />
<b>int(* write_packet )(void *opaque, uint8_t *buf, int buf_size)</b>
<br />
<b>int64_t(* seek )(void *opaque, int64_t offset, int whence)</b>
<br />
<b>int64_t pos</b>
position in the file of the current buffer
<br />
<b>int must_flush</b>
true if the next seek should flush
<br />
<b>int eof_reached</b>
true if eof reached
<br />
<b>int write_flag</b>
true if open for writing
<br />
<b>int max_packet_size</b>
<br />
<b>unsigned long checksum</b>
<br />
<b>unsigned char * checksum_ptr</b>
<br />
<b>unsigned long(* update_checksum )(unsigned long checksum, const uint8_t *buf, unsigned int size)</b>
<br />
<b>int error</b>
contains the error code or 0 if no error happened
<br />
<b>int(* read_pause )(void *opaque, int pause)</b>
Pause or resume playback for network streaming protocols - e.g.
<br />
<b>int64_t(* read_seek )(void *opaque, int stream_index, int64_t timestamp, int flags)</b>
Seek to a given timestamp in stream with the specified stream_index.
<br />
<b>int seekable</b>
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
<br />
<b>int64_t maxsize</b>
max filesize, used to limit allocations This field is internal to libavformat and access from outside is not allowed.
<br />
<b>int direct</b>
avio_read and avio_write should if possible be satisfied directly instead of going through a buffer, and avio_seek will always call the underlying seek function directly.
<br />
<b>int64_t bytes_read</b>
Bytes read statistic This field is internal to libavformat and access from outside is not allowed.
<br />
<b>int seek_count</b>
seek statistic This field is internal to libavformat and access from outside is not allowed.
<br />
<b>int writeout_count</b>
writeout statistic This field is internal to libavformat and access from outside is not allowed.
<br />
<b>int orig_buffer_size</b>
Original buffer size used internally after probing and ensure seekback to reset the buffer size This field is internal to libavformat and access from outside is not allowed.
</p>
</dd>
</dl>
</a>
<a name="AVDictionary">
<dl class="data">
<dt>AVDictionary</dt>
<dd>
This is used to pass parameters to ffmpeg.
<p>
<b>int count</b> <br />
<b>AVDictionaryEntry *elems</b> <br />
</p>
</dd>
</a>
</dl>
<a name="AVDictionaryEntry">
<dl class="data">
<dt>AVDictionaryEntry</dt>
<dd>
This is used to hold dictionary entries in AVDictionary.
<p>
<b>char *ket</b> <br />
<b>char *value</b> <br />
</p>
</dd>
</a>
</dl>
<a name="AVFrame">
<dl class="data">
<dt><a href="data.html#AVFrame">AVFrame</a> </dt>
<dd>
This struct is dependent upon the type of codec, and therefore is dynamically defined. There are common data members for this struct, though:
<p>
<b>uint8_t *data[4]</b>: <br />
<b>int linesize[4]</b>: Stride information<br />
<b>uint8_t *base[4]</b>: <br />
<b>int key_frame</b>: <br />
<b>int pict_type</b>: <br />
<b>int64_t pts</b>: This is not the pts you want when decoding.<br />
<b>int coded_picture_number</b>: <br />
<b>int display_picture_number</b>: <br />
<b>int quality</b>: <br />
<b>int age</b>: <br />
<b>int reference</b>: <br />
<b>int8_t *qscale_table</b>: <br />
<b>int qstride</b>: <br />
<b>uint8_t *mbskip_table</b>: <br />
<b>int16_t (*motion_val[2])[2]</b>: <br />
<b>uint32_t *mb_type</b>: <br />
<b>uint8_t motion_subsample_log2</b>: <br />
<b>void *opaque</b>: User-defined data<br />
<b>uint64_t error[4]</b>: <br />
<b>int type</b>: <br />
<b>int repeat_pict</b>: Indicates we should repeat this picture this number of times <br />
<b>int qscale_type</b>: <br />
<b>int interlaced_frame</b>: <br />
<b>int top_field_first</b>: <br />
<b>AVPanScan *pan_scan</b>: <br />
<b>int palette_has_changed</b>: <br />
<b>int buffer_hints</b>: <br />
<b>short *dct_coeff</b>: <br />
<b>int8_t *ref_index[2]</b>: <br />
</p>
</dd>
</a>
</dl>
<a name="AVPacket">
<dl class="data">
<dt><a href="data.html#AVPacket">AVPacket</a> </dt>
<dd>
The struct in which raw packet data is stored. This data should be given to <a href="functions.html#avcodec_decode_audio2">avcodec_decode_audio2</a> or <a href="functions.html#avcodec_decode_video">avcodec_decode_video</a> to to get a frame.
<p>
<b>int64_t pts</b>: presentation time stamp in time_base units<br />
<b>int64_t dts</b>: decompression time stamp in time_base units<br />
<b>uint8_t * data</b>: the raw data<br />
<b>int size</b>: size of data<br />
<b>int stream_index</b>: the stream it came from, based on the number in the AVFormatContext<br />
<b>int flags</b>: set to PKT_FLAG_KEY if packet is a key frame<br />
<b>int duration</b>: presentation duration in time_base units (0 if not available)<br />
<b>void(* destruct )(struct AVPacket *)</b>: deallocation function for this packet (defaults to av_destruct_packet) <br />
<b>void * priv</b>:<br />
<b>int64_t pos</b>: byte position in stream, -1 if unknown </p>
</dd>
</a>
</dl>
<a name="AVPacketList">
<dl class="data">
<dt><a href="data.html#AVPacketList">AVPacketList</a> </dt>
<dd>
A simple linked list for packets.
<p>
<b>AVPacket pkt</b><br />
<b>AVPacketList * next</b>
</p>
</dd>
</a>
</dl>
<a name="AVPicture">
<dl class="data">
<dt><a href="data.html#AVPicture">AVPicture</a> </dt>
<dd>
This struct is the exact same as the first two data members of <a href="data.html#AVFrame">AVFrame</a>, so it is often casted from that. This is usually used in sws functions.
<p>
<b>uint8_t * data [4]</b><br />
<b>int linesize [4]</b>:
number of bytes per line
</p>
</dd>
</a>
</dl>
<a name="AVRational">
<dl class="data">
<dt><a href="data.html#AVRational">AVRational</a> </dt>
<dd>
Simple struct to represent rational numbers.
<p>
<b>int num</b>:
numerator<br />
<b>int den</b>:
denominator
</dd>
</a>
</dl>
<a name="AVStream">
<dl class="data">
<dt><a href="data.html#AVStream">AVStream</a> </dt>
<dd>
Struct for the stream. You will probably use the information in <b>codec</b> most often.
<p>
<b>int index</b>:<br />
<b>int id</b>:<br />
<b>AVCodecContext * codec</b>:<br />
<b>AVRational r_frame_rate</b>:<br />
<b>void * priv_data</b>:<br />
<b>int64_t codec_info_duration</b>:<br />
<b>int codec_info_nb_frames</b>:<br />
<b>AVFrac pts</b>:<br />
<b>AVRational time_base</b>:<br />
<b>int pts_wrap_bits</b>:<br />
<b>int stream_copy</b>:<br />
<b>enum AVDiscard discard</b>:
selects which packets can be discarded at will and dont need to be demuxed<br />
<b>float quality</b>:<br />
<b>int64_t start_time</b>:<br />
<b>int64_t duration</b>:<br />
<b>char language [4]</b>:<br />
<b>int need_parsing</b>:
1->full parsing needed, 2->only parse headers dont repack<br />
<b>AVCodecParserContext * parser</b>:<br />
<b>int64_t cur_dts</b>:<br />
<b>int last_IP_duration</b>:<br />
<b>int64_t last_IP_pts</b>:<br />
<b>AVIndexEntry * index_entries</b>:<br />
<b>int nb_index_entries</b>:<br />
<b>unsigned int index_entries_allocated_size</b>:<br />
<b>int64_t nb_frames</b>:
number of frames in this stream if known or 0<br />
<b>int64_t pts_buffer [MAX_REORDER_DELAY+1]</b>:<br />
</p>
</dd>
</a>
</dl>
<a name="ByteIOContext">
<dl class="data">
<dt><a href="data.html#ByteIOContext">ByteIOContext</a> </dt>
<dd>
Struct that stores the low-level file information about our movie file.
<p>
<b>unsigned char * buffer</b>: <br />
<b>int buffer_size</b>: <br />
<b>unsigned char * buf_ptr</b>: <br />
<b>unsigned char * buf_end</b>: <br />
<b>void * opaque</b>: <br />
<b>int(* read_packet )(void *opaque, uint8_t *buf, int buf_size)</b>: <br />
<b>int(* write_packet )(void *opaque, uint8_t *buf, int buf_size)</b>: <br />
<b>offset_t(* seek )(void *opaque, offset_t offset, int whence)</b>: <br />
<b>offset_t pos</b>: <br />
<b>int must_flush</b>: <br />
<b>int eof_reached</b>: <br />
<b>int write_flag</b>: <br />
<b>int is_streamed</b>: <br />
<b>int max_packet_size</b>: <br />
<b>unsigned long checksum</b>: <br />
<b>unsigned char * checksum_ptr</b>: <br />
<b>unsigned long(* update_checksum )(unsigned long checksum,</b>: <br /> <b>const uint8_t *buf, unsigned int size)</b>: <br />
<b>int error</b>:
contains the error code or 0 if no error happened <br />
</p>
</dd>
</a>
</dl>
<a name="SDL_AudioSpec">
<dl class="data">
<dt><a href="data.html#SDL_AudioSpec">SDL_AudioSpec</a> </dt>
<dd>
The <a href="data.html#SDL_AudioSpec">SDL_AudioSpec</a> structure is used to describe the format of some audio data. Data members:
<p>
<b>freq</b>: Audio frequency in samples per second<br />
<b>format</b>: Audio data format<br />
<b>channels</b>: Number of channels: 1 mono, 2 stereo, 4 surround, 6 surround with center and lfe<br />
<b>silence</b>: Audio buffer silence value (calculated)<br />
<b>samples</b>: Audio buffer size in samples<br />
<b>size</b>: Audio buffer size in bytes (calculated)<br />
<b>callback(..)</b>: Callback function for filling the audio buffer<br />
<b>userdata</b>: Pointer the user data which is passed to the callback function
</p>
<p>The following <b>format</b> values are acceptable:<br />
AUDIO_U8 Unsigned 8-bit samples.<br />
AUDIO_S8 Signed 8-bit samples.<br />
AUDIO_U16 or AUDIO_U16LSB not supported by all hardware (unsigned 16-bit little-endian)<br />
AUDIO_S16 or AUDIO_S16LSBnot supported by all hardware (signed 16-bit little-endian)<br />
AUDIO_U16MSB not supported by all hardware (unsigned 16-bit big-endian)<br />
AUDIO_S16MSBnot supported by all hardware (signed 16-bit big-endian)<br />
AUDIO_U16SYS Either AUDIO_U16LSB or AUDIO_U16MSB depending on hardware CPU endianness<br />
AUDIO_S16SYS Either AUDIO_S16LSB or AUDIO_S16MSB depending on hardware CPU endianness<br />
</p>
</dd>
</a>
</dl>
<a name="SDL_Event">
<dl class="data">
<dt><a href="data.html#SDL_Event">SDL_Event</a> </dt>
<dd>
General event structure. Data members:
<p>
<b>type</b>: The type of event<br />
<b>active</b>: Activation event (see SDL_ActiveEvent)<br />
<b>key</b>: Keyboard event (see SDL_KeyboardEvent)<br />
<b>motion</b>: Mouse motion event (see SDL_MouseMotionEvent)<br />
<b>button</b>: Mouse button event (see SDL_MouseButtonEvent)<br />
<b>jaxis</b>: Joystick axis motion event (see SDL_JoyAxisEvent)<br />
<b>jball</b>: Joystick trackball motion event (see SDL_JoyBallEvent)<br />
<b>jhat</b>: Joystick hat motion event (see SDL_JoyHatEvent)<br />
<b>jbutton</b>: Joystick button event (see SDL_JoyButtonEvent)<br />
<b>resize</b>: Application window resize event (see SDL_ResizeEvent)<br />
<b>expose</b>: Application window expose event (see SDL_ExposeEvent)<br />
<b>quit</b>: Application quit request event (see SDL_QuitEvent)<br />
<b>user</b>: User defined event (see SDL_UserEvent)<br />
<b>syswm</b>: Undefined window manager event (see SDL_SysWMEvent)<br />
</p>
<p>
Here are the event types. See the <a href="http://www.libsdl.org/cgi/docwiki.cgi/SDL_5fEvent">SDL documentation</a> for more info:<br /><br />
SDL_ACTIVEEVENT SDL_ActiveEvent<br />
SDL_KEYDOWN/UP SDL_KeyboardEvent<br />
SDL_MOUSEMOTION SDL_MouseMotionEvent<br />
SDL_MOUSEBUTTONDOWN/UP SDL_MouseButtonEvent<br />
SDL_JOYAXISMOTION SDL_JoyAxisEvent<br />
SDL_JOYBALLMOTION SDL_JoyBallEvent<br />
SDL_JOYHATMOTION SDL_JoyHatEvent<br />
SDL_JOYBUTTONDOWN/UP SDL_JoyButtonEvent<br />
SDL_VIDEORESIZE SDL_ResizeEvent<br />
SDL_VIDEOEXPOSE SDL_ExposeEvent<br />
SDL_QUIT SDL_QuitEvent<br />
SDL_USEREVENT SDL_UserEvent<br />
SDL_SYSWMEVENT SDL_SysWMEvent<br />
</dd>
</a>
</dl>
<a name="SDL_Overlay">
<dl class="data">
<dt><a href="data.html#SDL_Overlay">SDL_Overlay</a> </dt>
<dd>A YUV Overlay. Data members:
<p>
<b>format</b>: Overlay format (see below)<br />
<b>w, h</b>: Width and height of overlay<br />
<b>planes</b>: Number of planes in the overlay. Usually either 1 or 3<br />
<b>pitches</b>: An array of pitches, one for each plane. Pitch is the length of a row in bytes.<br />
<b>pixels</b>: An array of pointers to the data of each plane. The overlay be locked before these pointers are used.<br />
<b>hw_overlay</b>: This will be set to 1 if the overlay is hardware accelerated.<br />
</b>
</dd>
</a>
</dl>
<a name="SDL_Rect">
<dl class="data">
<dt><a href="data.html#SDL_Rect">SDL_Rect</a> </dt>
<dd>
Defines a rectangular area.
<p>
<b>Sint16 x, y</b>
<b>Uint16 w, h</b>
</p>
<p>
<i>x, y</i>: Position of the upper-left corner of the rectangle
<i>w, h</i>: The width and height of the rectangle
</p>
<p>A SDL_Rect defines a rectangular area of pixels. It is used by SDL_BlitSurface to define blitting regions and by several other video functions.
</p>
</dd>
</a>
</dl>
<a name="SDL_Surface">
<dl class="data">
<dt><a href="data.html#SDL_Surface">SDL_Surface</a> </dt>
<dd>
Graphical Surface Structure
<p>
<b>Uint32 flags</b> (Read-only): Surface flags<br />
<b>SDL_PixelFormat *format</b> (Read-only)<br />
<b>int w, h</b> (Read-only): Width and height<br />
<b>Uint16 pitch</b> (Read-only): stride<br />
<b>void *pixels</b> (Read-write): pointer to actual pixel data<br />
<b>SDL_Rect clip_rect</b> (Read-only): Surface clip rectangle<br />
<b>int refcount</b> (Read-mostly): used for mem allocation<br />
This structure also contains private fields not shown here.
</p>
<p>
An SDL_Surface represents an area of "graphical" memory, memory that can be drawn to. The video framebuffer is returned as a SDL_Surface by SDL_SetVideoMode and SDL_GetVideoSurface. The <b>w</b> and <b>h</b> fields are values representing the width and height of the surface in pixels. The <b>pixels</b> field is a pointer to the actual pixel data. Note: the surface should be locked (via SDL_LockSurface) before accessing this field. The <b>clip_rect</b> field is the clipping rectangle as set by SDL_SetClipRect.
</p>
<p>
The flags field supports the following OR-ed values:<br />
SDL_SWSURFACE Surface is stored in system memory<br />
SDL_HWSURFACE Surface is stored in video memory<br />
SDL_ASYNCBLIT Surface uses asynchronous blits if possible<br />
SDL_ANYFORMAT Allows any pixel-format (Display surface)<br />
SDL_HWPALETTE Surface has exclusive palette<br />
SDL_DOUBLEBUF Surface is double buffered (Display surface)<br />
SDL_FULLSCREEN Surface is full screen (Display Surface)<br />
SDL_OPENGL Surface has an OpenGL context (Display Surface)<br />
SDL_OPENGLBLIT Surface supports OpenGL blitting (Display Surface). NOTE: This option is kept for compatibility only, and is not recommended for new code.<br />
SDL_RESIZABLE Surface is resizable (Display Surface)<br />
SDL_HWACCEL Surface blit uses hardware acceleration<br />
SDL_SRCCOLORKEY Surface use colorkey blitting<br />
SDL_RLEACCEL Colorkey blitting is accelerated with RLE<br />
SDL_SRCALPHA Surface blit uses alpha blending<br />
SDL_PREALLOC Surface uses preallocated memory<br />
<p>
</dd>
</a>
</dl>
<a name="SDL_Thread">
<dl class="data">
<dt><a href="data.html#SDL_Thread">SDL_Thread</a> </dt>
<dd>
This struct is is system independent and you probably don't have to use it. For more info, see src/thread/sdl_thread_c.h in the source code.
</dd>
</a>
</dl>
<a name="SDL_cond">
<dl class="data">
<dt><a href="data.html#SDL_cond">SDL_cond</a> </dt>
<dd> This struct is is system independent and you probably don't have to use it. For more info, see src/thread/<system&rt;/SDL_syscond.c in the source code.</dd>
</a>
</dl>
<a name="SDL_mutex">
<dl class="data">
<dt><a href="data.html#SDL_mutex">SDL_mutex</a> </dt>
<dd>This struct is is system independent and you probably don't have to use it. For more info, see src/thread/<system&rt;/SDL_sysmutex.c in the source code. </dd>
</a>
</dl>
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Code examples are based off of FFplay, Copyright (c) 2003 Fabrice Bellard, and a tutorial by Martin Bohme.
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