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<section id="media-controller-types">
<title>Types and flags used to represent the media graph elements</title>
<table frame="none" pgwide="1" id="media-entity-type">
<title>Media entity types</title>
<tgroup cols="2">
<colspec colname="c1"/>
<colspec colname="c2"/>
<tbody valign="top">
<row>
<entry><constant>MEDIA_ENT_F_UNKNOWN</constant> and <constant>MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN</constant></entry>
<entry>Unknown entity. That generally indicates that
a driver didn't initialize properly the entity, with is a Kernel bug</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IO_V4L</constant></entry>
<entry>Data streaming input and/or output entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IO_VBI</constant></entry>
<entry>V4L VBI streaming input or output entity</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IO_SWRADIO</constant></entry>
<entry>V4L Software Digital Radio (SDR) streaming input or output entity</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IO_DTV</constant></entry>
<entry>DVB Digital TV streaming input or output entity</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_DTV_DEMOD</constant></entry>
<entry>Digital TV demodulator entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_TS_DEMUX</constant></entry>
<entry>MPEG Transport stream demux entity. Could be implemented on hardware or in Kernelspace by the Linux DVB subsystem.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_DTV_CA</constant></entry>
<entry>Digital TV Conditional Access module (CAM) entity</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_DTV_NET_DECAP</constant></entry>
<entry>Digital TV network ULE/MLE desencapsulation entity. Could be implemented on hardware or in Kernelspace</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_CONN_RF</constant></entry>
<entry>Connector for a Radio Frequency (RF) signal.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_CONN_SVIDEO</constant></entry>
<entry>Connector for a S-Video signal.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_CONN_COMPOSITE</constant></entry>
<entry>Connector for a RGB composite signal.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_CAM_SENSOR</constant></entry>
<entry>Camera video sensor entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_FLASH</constant></entry>
<entry>Flash controller entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_LENS</constant></entry>
<entry>Lens controller entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_ATV_DECODER</constant></entry>
<entry>Analog video decoder, the basic function of the video decoder
is to accept analogue video from a wide variety of sources such as
broadcast, DVD players, cameras and video cassette recorders, in
either NTSC, PAL, SECAM or HD format, separating the stream
into its component parts, luminance and chrominance, and output
it in some digital video standard, with appropriate timing
signals.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_TUNER</constant></entry>
<entry>Digital TV, analog TV, radio and/or software radio tuner,
with consists on a PLL tuning stage that converts radio
frequency (RF) signal into an Intermediate Frequency (IF).
Modern tuners have internally IF-PLL decoders for audio
and video, but older models have those stages implemented
on separate entities.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IF_VID_DECODER</constant></entry>
<entry>IF-PLL video decoder. It receives the IF from a PLL
and decodes the analog TV video signal. This is commonly
found on some very old analog tuners, like Philips MK3
designs. They all contain a tda9887 (or some software
compatible similar chip, like tda9885). Those devices
use a different I2C address than the tuner PLL.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_IF_AUD_DECODER</constant></entry>
<entry>IF-PLL sound decoder. It receives the IF from a PLL
and decodes the analog TV audio signal. This is commonly
found on some very old analog hardware, like Micronas
msp3400, Philips tda9840, tda985x, etc. Those devices
use a different I2C address than the tuner PLL and
should be controlled together with the IF-PLL video
decoder.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_AUDIO_CAPTURE</constant></entry>
<entry>Audio Capture Function Entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_AUDIO_PLAYBACK</constant></entry>
<entry>Audio Playback Function Entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_AUDIO_MIXER</constant></entry>
<entry>Audio Mixer Function Entity.</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_COMPOSER</constant></entry>
<entry>Video composer (blender). An entity capable of video
composing must have at least two sink pads and one source
pad, and composes input video frames onto output video
frames. Composition can be performed using alpha blending,
color keying, raster operations (ROP), stitching or any other
means.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER</constant></entry>
<entry>Video pixel formatter. An entity capable of pixel formatting
must have at least one sink pad and one source pad. Read
pixel formatters read pixels from memory and perform a subset
of unpacking, cropping, color keying, alpha multiplication
and pixel encoding conversion. Write pixel formatters perform
a subset of dithering, pixel encoding conversion and packing
and write pixels to memory.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV</constant></entry>
<entry>Video pixel encoding converter. An entity capable of pixel
enconding conversion must have at least one sink pad and one
source pad, and convert the encoding of pixels received on
its sink pad(s) to a different encoding output on its source
pad(s). Pixel encoding conversion includes but isn't limited
to RGB to/from HSV, RGB to/from YUV and CFA (Bayer) to RGB
conversions.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_LUT</constant></entry>
<entry>Video look-up table. An entity capable of video lookup table
processing must have one sink pad and one source pad. It uses
the values of the pixels received on its sink pad to look up
entries in internal tables and output them on its source pad.
The lookup processing can be performed on all components
separately or combine them for multi-dimensional table
lookups.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_SCALER</constant></entry>
<entry>Video scaler. An entity capable of video scaling must have
at least one sink pad and one source pad, and scale the
video frame(s) received on its sink pad(s) to a different
resolution output on its source pad(s). The range of
supported scaling ratios is entity-specific and can differ
between the horizontal and vertical directions (in particular
scaling can be supported in one direction only). Binning and
skipping are considered as scaling.
</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_F_PROC_VIDEO_STATISTICS</constant></entry>
<entry>Video statistics computation (histogram, 3A, ...). An entity
capable of statistics computation must have one sink pad and
one source pad. It computes statistics over the frames
received on its sink pad and outputs the statistics data on
its source pad.
</entry>
</row>
</tbody>
</tgroup>
</table>
<table frame="none" pgwide="1" id="media-entity-flag">
<title>Media entity flags</title>
<tgroup cols="2">
<colspec colname="c1"/>
<colspec colname="c2"/>
<tbody valign="top">
<row>
<entry><constant>MEDIA_ENT_FL_DEFAULT</constant></entry>
<entry>Default entity for its type. Used to discover the default
audio, VBI and video devices, the default camera sensor, ...</entry>
</row>
<row>
<entry><constant>MEDIA_ENT_FL_CONNECTOR</constant></entry>
<entry>The entity represents a data conector</entry>
</row>
</tbody>
</tgroup>
</table>
<table frame="none" pgwide="1" id="media-intf-type">
<title>Media interface types</title>
<tgroup cols="3">
<colspec colname="c1"/>
<colspec colname="c2"/>
<colspec colname="c3"/>
<tbody valign="top">
<row>
<entry><constant>MEDIA_INTF_T_DVB_FE</constant></entry>
<entry>Device node interface for the Digital TV frontend</entry>
<entry>typically, /dev/dvb/adapter?/frontend?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_DVB_DEMUX</constant></entry>
<entry>Device node interface for the Digital TV demux</entry>
<entry>typically, /dev/dvb/adapter?/demux?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_DVB_DVR</constant></entry>
<entry>Device node interface for the Digital TV DVR</entry>
<entry>typically, /dev/dvb/adapter?/dvr?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_DVB_CA</constant></entry>
<entry>Device node interface for the Digital TV Conditional Access</entry>
<entry>typically, /dev/dvb/adapter?/ca?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_DVB_FE</constant></entry>
<entry>Device node interface for the Digital TV network control</entry>
<entry>typically, /dev/dvb/adapter?/net?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_V4L_VIDEO</constant></entry>
<entry>Device node interface for video (V4L)</entry>
<entry>typically, /dev/video?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_V4L_VBI</constant></entry>
<entry>Device node interface for VBI (V4L)</entry>
<entry>typically, /dev/vbi?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_V4L_RADIO</constant></entry>
<entry>Device node interface for radio (V4L)</entry>
<entry>typically, /dev/vbi?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_V4L_SUBDEV</constant></entry>
<entry>Device node interface for a V4L subdevice</entry>
<entry>typically, /dev/v4l-subdev?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_V4L_SWRADIO</constant></entry>
<entry>Device node interface for Software Defined Radio (V4L)</entry>
<entry>typically, /dev/swradio?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_PCM_CAPTURE</constant></entry>
<entry>Device node interface for ALSA PCM Capture</entry>
<entry>typically, /dev/snd/pcmC?D?c</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_PCM_PLAYBACK</constant></entry>
<entry>Device node interface for ALSA PCM Playback</entry>
<entry>typically, /dev/snd/pcmC?D?p</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_CONTROL</constant></entry>
<entry>Device node interface for ALSA Control</entry>
<entry>typically, /dev/snd/controlC?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_COMPRESS</constant></entry>
<entry>Device node interface for ALSA Compress</entry>
<entry>typically, /dev/snd/compr?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_RAWMIDI</constant></entry>
<entry>Device node interface for ALSA Raw MIDI</entry>
<entry>typically, /dev/snd/midi?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_HWDEP</constant></entry>
<entry>Device node interface for ALSA Hardware Dependent</entry>
<entry>typically, /dev/snd/hwC?D?</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_SEQUENCER</constant></entry>
<entry>Device node interface for ALSA Sequencer</entry>
<entry>typically, /dev/snd/seq</entry>
</row>
<row>
<entry><constant>MEDIA_INTF_T_ALSA_TIMER</constant></entry>
<entry>Device node interface for ALSA Timer</entry>
<entry>typically, /dev/snd/timer</entry>
</row>
</tbody>
</tgroup>
</table>
<table frame="none" pgwide="1" id="media-pad-flag">
<title>Media pad flags</title>
<tgroup cols="2">
<colspec colname="c1"/>
<colspec colname="c2"/>
<tbody valign="top">
<row>
<entry><constant>MEDIA_PAD_FL_SINK</constant></entry>
<entry>Input pad, relative to the entity. Input pads sink data and
are targets of links.</entry>
</row>
<row>
<entry><constant>MEDIA_PAD_FL_SOURCE</constant></entry>
<entry>Output pad, relative to the entity. Output pads source data
and are origins of links.</entry>
</row>
<row>
<entry><constant>MEDIA_PAD_FL_MUST_CONNECT</constant></entry>
<entry>If this flag is set and the pad is linked to any other
pad, then at least one of those links must be enabled for the
entity to be able to stream. There could be temporary reasons
(e.g. device configuration dependent) for the pad to need
enabled links even when this flag isn't set; the absence of the
flag doesn't imply there is none.</entry>
</row>
</tbody>
</tgroup>
</table>
<para>One and only one of <constant>MEDIA_PAD_FL_SINK</constant> and
<constant>MEDIA_PAD_FL_SOURCE</constant> must be set for every pad.</para>
<table frame="none" pgwide="1" id="media-link-flag">
<title>Media link flags</title>
<tgroup cols="2">
<colspec colname="c1"/>
<colspec colname="c2"/>
<tbody valign="top">
<row>
<entry><constant>MEDIA_LNK_FL_ENABLED</constant></entry>
<entry>The link is enabled and can be used to transfer media data.
When two or more links target a sink pad, only one of them can be
enabled at a time.</entry>
</row>
<row>
<entry><constant>MEDIA_LNK_FL_IMMUTABLE</constant></entry>
<entry>The link enabled state can't be modified at runtime. An
immutable link is always enabled.</entry>
</row>
<row>
<entry><constant>MEDIA_LNK_FL_DYNAMIC</constant></entry>
<entry>The link enabled state can be modified during streaming. This
flag is set by drivers and is read-only for applications.</entry>
</row>
<row>
<entry><constant>MEDIA_LNK_FL_LINK_TYPE</constant></entry>
<entry><para>This is a bitmask that defines the type of the link.
Currently, two types of links are supported:</para>
<para><constant>MEDIA_LNK_FL_DATA_LINK</constant>
if the link is between two pads</para>
<para><constant>MEDIA_LNK_FL_INTERFACE_LINK</constant>
if the link is between an interface and an entity</para></entry>
</row>
</tbody>
</tgroup>
</table>
</section>
|
