1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _media-controller-types:
5 Types and flags used to represent the media graph elements
6 ==========================================================
8 .. tabularcolumns:: |p{8.2cm}|p{9.3cm}|
10 .. _media-entity-functions:
11 .. _MEDIA-ENT-F-UNKNOWN:
12 .. _MEDIA-ENT-F-V4L2-SUBDEV-UNKNOWN:
13 .. _MEDIA-ENT-F-IO-V4L:
14 .. _MEDIA-ENT-F-IO-VBI:
15 .. _MEDIA-ENT-F-IO-SWRADIO:
16 .. _MEDIA-ENT-F-IO-DTV:
17 .. _MEDIA-ENT-F-DTV-DEMOD:
18 .. _MEDIA-ENT-F-TS-DEMUX:
19 .. _MEDIA-ENT-F-DTV-CA:
20 .. _MEDIA-ENT-F-DTV-NET-DECAP:
21 .. _MEDIA-ENT-F-CONN-RF:
22 .. _MEDIA-ENT-F-CONN-SVIDEO:
23 .. _MEDIA-ENT-F-CONN-COMPOSITE:
24 .. _MEDIA-ENT-F-CAM-SENSOR:
25 .. _MEDIA-ENT-F-FLASH:
27 .. _MEDIA-ENT-F-ATV-DECODER:
28 .. _MEDIA-ENT-F-TUNER:
29 .. _MEDIA-ENT-F-IF-VID-DECODER:
30 .. _MEDIA-ENT-F-IF-AUD-DECODER:
31 .. _MEDIA-ENT-F-AUDIO-CAPTURE:
32 .. _MEDIA-ENT-F-AUDIO-PLAYBACK:
33 .. _MEDIA-ENT-F-AUDIO-MIXER:
34 .. _MEDIA-ENT-F-PROC-VIDEO-COMPOSER:
35 .. _MEDIA-ENT-F-PROC-VIDEO-PIXEL-FORMATTER:
36 .. _MEDIA-ENT-F-PROC-VIDEO-PIXEL-ENC-CONV:
37 .. _MEDIA-ENT-F-PROC-VIDEO-LUT:
38 .. _MEDIA-ENT-F-PROC-VIDEO-SCALER:
39 .. _MEDIA-ENT-F-PROC-VIDEO-STATISTICS:
40 .. _MEDIA-ENT-F-PROC-VIDEO-ENCODER:
41 .. _MEDIA-ENT-F-PROC-VIDEO-DECODER:
42 .. _MEDIA-ENT-F-PROC-VIDEO-ISP:
43 .. _MEDIA-ENT-F-VID-MUX:
44 .. _MEDIA-ENT-F-VID-IF-BRIDGE:
45 .. _MEDIA-ENT-F-DV-DECODER:
46 .. _MEDIA-ENT-F-DV-ENCODER:
48 .. cssclass:: longtable
50 .. flat-table:: Media entity functions
54 * - ``MEDIA_ENT_F_UNKNOWN`` and
55 ``MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN``
56 - Unknown entity. That generally indicates that a driver didn't
57 initialize properly the entity, which is a Kernel bug
59 * - ``MEDIA_ENT_F_IO_V4L``
60 - Data streaming input and/or output entity.
62 * - ``MEDIA_ENT_F_IO_VBI``
63 - V4L VBI streaming input or output entity
65 * - ``MEDIA_ENT_F_IO_SWRADIO``
66 - V4L Software Digital Radio (SDR) streaming input or output entity
68 * - ``MEDIA_ENT_F_IO_DTV``
69 - DVB Digital TV streaming input or output entity
71 * - ``MEDIA_ENT_F_DTV_DEMOD``
72 - Digital TV demodulator entity.
74 * - ``MEDIA_ENT_F_TS_DEMUX``
75 - MPEG Transport stream demux entity. Could be implemented on
76 hardware or in Kernelspace by the Linux DVB subsystem.
78 * - ``MEDIA_ENT_F_DTV_CA``
79 - Digital TV Conditional Access module (CAM) entity
81 * - ``MEDIA_ENT_F_DTV_NET_DECAP``
82 - Digital TV network ULE/MLE desencapsulation entity. Could be
83 implemented on hardware or in Kernelspace
85 * - ``MEDIA_ENT_F_CONN_RF``
86 - Connector for a Radio Frequency (RF) signal.
88 * - ``MEDIA_ENT_F_CONN_SVIDEO``
89 - Connector for a S-Video signal.
91 * - ``MEDIA_ENT_F_CONN_COMPOSITE``
92 - Connector for a RGB composite signal.
94 * - ``MEDIA_ENT_F_CAM_SENSOR``
95 - Camera video sensor entity.
97 * - ``MEDIA_ENT_F_FLASH``
98 - Flash controller entity.
100 * - ``MEDIA_ENT_F_LENS``
101 - Lens controller entity.
103 * - ``MEDIA_ENT_F_ATV_DECODER``
104 - Analog video decoder, the basic function of the video decoder is
105 to accept analogue video from a wide variety of sources such as
106 broadcast, DVD players, cameras and video cassette recorders, in
107 either NTSC, PAL, SECAM or HD format, separating the stream into
108 its component parts, luminance and chrominance, and output it in
109 some digital video standard, with appropriate timing signals.
111 * - ``MEDIA_ENT_F_TUNER``
112 - Digital TV, analog TV, radio and/or software radio tuner, with
113 consists on a PLL tuning stage that converts radio frequency (RF)
114 signal into an Intermediate Frequency (IF). Modern tuners have
115 internally IF-PLL decoders for audio and video, but older models
116 have those stages implemented on separate entities.
118 * - ``MEDIA_ENT_F_IF_VID_DECODER``
119 - IF-PLL video decoder. It receives the IF from a PLL and decodes
120 the analog TV video signal. This is commonly found on some very
121 old analog tuners, like Philips MK3 designs. They all contain a
122 tda9887 (or some software compatible similar chip, like tda9885).
123 Those devices use a different I2C address than the tuner PLL.
125 * - ``MEDIA_ENT_F_IF_AUD_DECODER``
126 - IF-PLL sound decoder. It receives the IF from a PLL and decodes
127 the analog TV audio signal. This is commonly found on some very
128 old analog hardware, like Micronas msp3400, Philips tda9840,
129 tda985x, etc. Those devices use a different I2C address than the
130 tuner PLL and should be controlled together with the IF-PLL video
133 * - ``MEDIA_ENT_F_AUDIO_CAPTURE``
134 - Audio Capture Function Entity.
136 * - ``MEDIA_ENT_F_AUDIO_PLAYBACK``
137 - Audio Playback Function Entity.
139 * - ``MEDIA_ENT_F_AUDIO_MIXER``
140 - Audio Mixer Function Entity.
142 * - ``MEDIA_ENT_F_PROC_VIDEO_COMPOSER``
143 - Video composer (blender). An entity capable of video
144 composing must have at least two sink pads and one source
145 pad, and composes input video frames onto output video
146 frames. Composition can be performed using alpha blending,
147 color keying, raster operations (ROP), stitching or any other
150 * - ``MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER``
151 - Video pixel formatter. An entity capable of pixel formatting
152 must have at least one sink pad and one source pad. Read
153 pixel formatters read pixels from memory and perform a subset
154 of unpacking, cropping, color keying, alpha multiplication
155 and pixel encoding conversion. Write pixel formatters perform
156 a subset of dithering, pixel encoding conversion and packing
157 and write pixels to memory.
159 * - ``MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV``
160 - Video pixel encoding converter. An entity capable of pixel
161 encoding conversion must have at least one sink pad and one
162 source pad, and convert the encoding of pixels received on
163 its sink pad(s) to a different encoding output on its source
164 pad(s). Pixel encoding conversion includes but isn't limited
165 to RGB to/from HSV, RGB to/from YUV and CFA (Bayer) to RGB
168 * - ``MEDIA_ENT_F_PROC_VIDEO_LUT``
169 - Video look-up table. An entity capable of video lookup table
170 processing must have one sink pad and one source pad. It uses
171 the values of the pixels received on its sink pad to look up
172 entries in internal tables and output them on its source pad.
173 The lookup processing can be performed on all components
174 separately or combine them for multi-dimensional table
177 * - ``MEDIA_ENT_F_PROC_VIDEO_SCALER``
178 - Video scaler. An entity capable of video scaling must have
179 at least one sink pad and one source pad, and scale the
180 video frame(s) received on its sink pad(s) to a different
181 resolution output on its source pad(s). The range of
182 supported scaling ratios is entity-specific and can differ
183 between the horizontal and vertical directions (in particular
184 scaling can be supported in one direction only). Binning and
185 sub-sampling (occasionally also referred to as skipping) are
186 considered as scaling.
188 * - ``MEDIA_ENT_F_PROC_VIDEO_STATISTICS``
189 - Video statistics computation (histogram, 3A, etc.). An entity
190 capable of statistics computation must have one sink pad and
191 one source pad. It computes statistics over the frames
192 received on its sink pad and outputs the statistics data on
195 * - ``MEDIA_ENT_F_PROC_VIDEO_ENCODER``
196 - Video (MPEG, HEVC, VPx, etc.) encoder. An entity capable of
197 compressing video frames. Must have one sink pad and at least
200 * - ``MEDIA_ENT_F_PROC_VIDEO_DECODER``
201 - Video (MPEG, HEVC, VPx, etc.) decoder. An entity capable of
202 decompressing a compressed video stream into uncompressed video
203 frames. Must have one sink pad and at least one source pad.
205 * - ``MEDIA_ENT_F_PROC_VIDEO_ISP``
206 - An Image Signal Processor (ISP) device. ISPs generally are one of a
207 kind devices that have their specific control interfaces using a
208 combination of custom V4L2 controls and IOCTLs, and parameters
209 supplied in a metadata buffer.
211 * - ``MEDIA_ENT_F_VID_MUX``
212 - Video multiplexer. An entity capable of multiplexing must have at
213 least two sink pads and one source pad, and must pass the video
214 frame(s) received from the active sink pad to the source pad.
216 * - ``MEDIA_ENT_F_VID_IF_BRIDGE``
217 - Video interface bridge. A video interface bridge entity must have at
218 least one sink pad and at least one source pad. It receives video
219 frames on its sink pad from an input video bus of one type (HDMI, eDP,
220 MIPI CSI-2, etc.), and outputs them on its source pad to an output
221 video bus of another type (eDP, MIPI CSI-2, parallel, etc.).
223 * - ``MEDIA_ENT_F_DV_DECODER``
224 - Digital video decoder. The basic function of the video decoder is
225 to accept digital video from a wide variety of sources
226 and output it in some digital video standard, with appropriate
229 * - ``MEDIA_ENT_F_DV_ENCODER``
230 - Digital video encoder. The basic function of the video encoder is
231 to accept digital video from some digital video standard with
232 appropriate timing signals (usually a parallel video bus with sync
233 signals) and output this to a digital video output connector such
234 as HDMI or DisplayPort.
236 .. tabularcolumns:: |p{5.5cm}|p{12.0cm}|
238 .. _media-entity-flag:
239 .. _MEDIA-ENT-FL-DEFAULT:
240 .. _MEDIA-ENT-FL-CONNECTOR:
242 .. flat-table:: Media entity flags
246 * - ``MEDIA_ENT_FL_DEFAULT``
247 - Default entity for its type. Used to discover the default audio,
248 VBI and video devices, the default camera sensor, etc.
250 * - ``MEDIA_ENT_FL_CONNECTOR``
251 - The entity represents a connector.
254 .. tabularcolumns:: |p{6.5cm}|p{6.0cm}|p{4.8cm}|
257 .. _MEDIA-INTF-T-DVB-FE:
258 .. _MEDIA-INTF-T-DVB-DEMUX:
259 .. _MEDIA-INTF-T-DVB-DVR:
260 .. _MEDIA-INTF-T-DVB-CA:
261 .. _MEDIA-INTF-T-DVB-NET:
262 .. _MEDIA-INTF-T-V4L-VIDEO:
263 .. _MEDIA-INTF-T-V4L-VBI:
264 .. _MEDIA-INTF-T-V4L-RADIO:
265 .. _MEDIA-INTF-T-V4L-SUBDEV:
266 .. _MEDIA-INTF-T-V4L-SWRADIO:
267 .. _MEDIA-INTF-T-V4L-TOUCH:
268 .. _MEDIA-INTF-T-ALSA-PCM-CAPTURE:
269 .. _MEDIA-INTF-T-ALSA-PCM-PLAYBACK:
270 .. _MEDIA-INTF-T-ALSA-CONTROL:
271 .. _MEDIA-INTF-T-ALSA-COMPRESS:
272 .. _MEDIA-INTF-T-ALSA-RAWMIDI:
273 .. _MEDIA-INTF-T-ALSA-HWDEP:
274 .. _MEDIA-INTF-T-ALSA-SEQUENCER:
275 .. _MEDIA-INTF-T-ALSA-TIMER:
277 .. flat-table:: Media interface types
281 * - ``MEDIA_INTF_T_DVB_FE``
282 - Device node interface for the Digital TV frontend
283 - typically, /dev/dvb/adapter?/frontend?
285 * - ``MEDIA_INTF_T_DVB_DEMUX``
286 - Device node interface for the Digital TV demux
287 - typically, /dev/dvb/adapter?/demux?
289 * - ``MEDIA_INTF_T_DVB_DVR``
290 - Device node interface for the Digital TV DVR
291 - typically, /dev/dvb/adapter?/dvr?
293 * - ``MEDIA_INTF_T_DVB_CA``
294 - Device node interface for the Digital TV Conditional Access
295 - typically, /dev/dvb/adapter?/ca?
297 * - ``MEDIA_INTF_T_DVB_NET``
298 - Device node interface for the Digital TV network control
299 - typically, /dev/dvb/adapter?/net?
301 * - ``MEDIA_INTF_T_V4L_VIDEO``
302 - Device node interface for video (V4L)
303 - typically, /dev/video?
305 * - ``MEDIA_INTF_T_V4L_VBI``
306 - Device node interface for VBI (V4L)
307 - typically, /dev/vbi?
309 * - ``MEDIA_INTF_T_V4L_RADIO``
310 - Device node interface for radio (V4L)
311 - typically, /dev/radio?
313 * - ``MEDIA_INTF_T_V4L_SUBDEV``
314 - Device node interface for a V4L subdevice
315 - typically, /dev/v4l-subdev?
317 * - ``MEDIA_INTF_T_V4L_SWRADIO``
318 - Device node interface for Software Defined Radio (V4L)
319 - typically, /dev/swradio?
321 * - ``MEDIA_INTF_T_V4L_TOUCH``
322 - Device node interface for Touch device (V4L)
323 - typically, /dev/v4l-touch?
325 * - ``MEDIA_INTF_T_ALSA_PCM_CAPTURE``
326 - Device node interface for ALSA PCM Capture
327 - typically, /dev/snd/pcmC?D?c
329 * - ``MEDIA_INTF_T_ALSA_PCM_PLAYBACK``
330 - Device node interface for ALSA PCM Playback
331 - typically, /dev/snd/pcmC?D?p
333 * - ``MEDIA_INTF_T_ALSA_CONTROL``
334 - Device node interface for ALSA Control
335 - typically, /dev/snd/controlC?
337 * - ``MEDIA_INTF_T_ALSA_COMPRESS``
338 - Device node interface for ALSA Compress
339 - typically, /dev/snd/compr?
341 * - ``MEDIA_INTF_T_ALSA_RAWMIDI``
342 - Device node interface for ALSA Raw MIDI
343 - typically, /dev/snd/midi?
345 * - ``MEDIA_INTF_T_ALSA_HWDEP``
346 - Device node interface for ALSA Hardware Dependent
347 - typically, /dev/snd/hwC?D?
349 * - ``MEDIA_INTF_T_ALSA_SEQUENCER``
350 - Device node interface for ALSA Sequencer
351 - typically, /dev/snd/seq
353 * - ``MEDIA_INTF_T_ALSA_TIMER``
354 - Device node interface for ALSA Timer
355 - typically, /dev/snd/timer
358 .. tabularcolumns:: |p{5.5cm}|p{12.0cm}|
361 .. _MEDIA-PAD-FL-SINK:
362 .. _MEDIA-PAD-FL-SOURCE:
363 .. _MEDIA-PAD-FL-MUST-CONNECT:
365 .. flat-table:: Media pad flags
369 * - ``MEDIA_PAD_FL_SINK``
370 - Input pad, relative to the entity. Input pads sink data and are
373 * - ``MEDIA_PAD_FL_SOURCE``
374 - Output pad, relative to the entity. Output pads source data and
375 are origins of links.
377 * - ``MEDIA_PAD_FL_MUST_CONNECT``
378 - If this flag is set, then for this pad to be able to stream, it must
379 be connected by at least one enabled link. There could be temporary
380 reasons (e.g. device configuration dependent) for the pad to need
381 enabled links even when this flag isn't set; the absence of the flag
382 doesn't imply there is none.
385 One and only one of ``MEDIA_PAD_FL_SINK`` and ``MEDIA_PAD_FL_SOURCE``
386 must be set for every pad.
388 .. tabularcolumns:: |p{5.5cm}|p{12.0cm}|
391 .. _MEDIA-LNK-FL-ENABLED:
392 .. _MEDIA-LNK-FL-IMMUTABLE:
393 .. _MEDIA-LNK-FL-DYNAMIC:
394 .. _MEDIA-LNK-FL-LINK-TYPE:
396 .. flat-table:: Media link flags
400 * - ``MEDIA_LNK_FL_ENABLED``
401 - The link is enabled and can be used to transfer media data. When
402 two or more links target a sink pad, only one of them can be
405 * - ``MEDIA_LNK_FL_IMMUTABLE``
406 - The link enabled state can't be modified at runtime. An immutable
407 link is always enabled.
409 * - ``MEDIA_LNK_FL_DYNAMIC``
410 - The link enabled state can be modified during streaming. This flag
411 is set by drivers and is read-only for applications.
413 * - ``MEDIA_LNK_FL_LINK_TYPE``
414 - This is a bitmask that defines the type of the link. The following
415 link types are currently supported:
417 .. _MEDIA-LNK-FL-DATA-LINK:
419 ``MEDIA_LNK_FL_DATA_LINK`` for links that represent a data connection
422 .. _MEDIA-LNK-FL-INTERFACE-LINK:
424 ``MEDIA_LNK_FL_INTERFACE_LINK`` for links that associate an entity to its
427 .. _MEDIA-LNK-FL-ANCILLARY-LINK:
429 ``MEDIA_LNK_FL_ANCILLARY_LINK`` for links that represent a physical
430 relationship between two entities. The link may or may not be
431 immutable, so applications must not assume either case.