1 .. Permission is granted to copy, distribute and/or modify this
2 .. document under the terms of the GNU Free Documentation License,
3 .. Version 1.1 or any later version published by the Free Software
4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
10 .. _media-controller-types:
12 Types and flags used to represent the media graph elements
13 ==========================================================
15 .. tabularcolumns:: |p{8.2cm}|p{10.3cm}|
17 .. _media-entity-functions:
18 .. _MEDIA-ENT-F-UNKNOWN:
19 .. _MEDIA-ENT-F-V4L2-SUBDEV-UNKNOWN:
20 .. _MEDIA-ENT-F-IO-V4L:
21 .. _MEDIA-ENT-F-IO-VBI:
22 .. _MEDIA-ENT-F-IO-SWRADIO:
23 .. _MEDIA-ENT-F-IO-DTV:
24 .. _MEDIA-ENT-F-DTV-DEMOD:
25 .. _MEDIA-ENT-F-TS-DEMUX:
26 .. _MEDIA-ENT-F-DTV-CA:
27 .. _MEDIA-ENT-F-DTV-NET-DECAP:
28 .. _MEDIA-ENT-F-CONN-RF:
29 .. _MEDIA-ENT-F-CONN-SVIDEO:
30 .. _MEDIA-ENT-F-CONN-COMPOSITE:
31 .. _MEDIA-ENT-F-CAM-SENSOR:
32 .. _MEDIA-ENT-F-FLASH:
34 .. _MEDIA-ENT-F-ATV-DECODER:
35 .. _MEDIA-ENT-F-TUNER:
36 .. _MEDIA-ENT-F-IF-VID-DECODER:
37 .. _MEDIA-ENT-F-IF-AUD-DECODER:
38 .. _MEDIA-ENT-F-AUDIO-CAPTURE:
39 .. _MEDIA-ENT-F-AUDIO-PLAYBACK:
40 .. _MEDIA-ENT-F-AUDIO-MIXER:
41 .. _MEDIA-ENT-F-PROC-VIDEO-COMPOSER:
42 .. _MEDIA-ENT-F-PROC-VIDEO-PIXEL-FORMATTER:
43 .. _MEDIA-ENT-F-PROC-VIDEO-PIXEL-ENC-CONV:
44 .. _MEDIA-ENT-F-PROC-VIDEO-LUT:
45 .. _MEDIA-ENT-F-PROC-VIDEO-SCALER:
46 .. _MEDIA-ENT-F-PROC-VIDEO-STATISTICS:
47 .. _MEDIA-ENT-F-PROC-VIDEO-ENCODER:
48 .. _MEDIA-ENT-F-PROC-VIDEO-DECODER:
49 .. _MEDIA-ENT-F-VID-MUX:
50 .. _MEDIA-ENT-F-VID-IF-BRIDGE:
51 .. _MEDIA-ENT-F-DV-DECODER:
52 .. _MEDIA-ENT-F-DV-ENCODER:
54 .. cssclass:: longtable
56 .. flat-table:: Media entity functions
60 * - ``MEDIA_ENT_F_UNKNOWN`` and
61 ``MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN``
62 - Unknown entity. That generally indicates that a driver didn't
63 initialize properly the entity, which is a Kernel bug
65 * - ``MEDIA_ENT_F_IO_V4L``
66 - Data streaming input and/or output entity.
68 * - ``MEDIA_ENT_F_IO_VBI``
69 - V4L VBI streaming input or output entity
71 * - ``MEDIA_ENT_F_IO_SWRADIO``
72 - V4L Software Digital Radio (SDR) streaming input or output entity
74 * - ``MEDIA_ENT_F_IO_DTV``
75 - DVB Digital TV streaming input or output entity
77 * - ``MEDIA_ENT_F_DTV_DEMOD``
78 - Digital TV demodulator entity.
80 * - ``MEDIA_ENT_F_TS_DEMUX``
81 - MPEG Transport stream demux entity. Could be implemented on
82 hardware or in Kernelspace by the Linux DVB subsystem.
84 * - ``MEDIA_ENT_F_DTV_CA``
85 - Digital TV Conditional Access module (CAM) entity
87 * - ``MEDIA_ENT_F_DTV_NET_DECAP``
88 - Digital TV network ULE/MLE desencapsulation entity. Could be
89 implemented on hardware or in Kernelspace
91 * - ``MEDIA_ENT_F_CONN_RF``
92 - Connector for a Radio Frequency (RF) signal.
94 * - ``MEDIA_ENT_F_CONN_SVIDEO``
95 - Connector for a S-Video signal.
97 * - ``MEDIA_ENT_F_CONN_COMPOSITE``
98 - Connector for a RGB composite signal.
100 * - ``MEDIA_ENT_F_CAM_SENSOR``
101 - Camera video sensor entity.
103 * - ``MEDIA_ENT_F_FLASH``
104 - Flash controller entity.
106 * - ``MEDIA_ENT_F_LENS``
107 - Lens controller entity.
109 * - ``MEDIA_ENT_F_ATV_DECODER``
110 - Analog video decoder, the basic function of the video decoder is
111 to accept analogue video from a wide variety of sources such as
112 broadcast, DVD players, cameras and video cassette recorders, in
113 either NTSC, PAL, SECAM or HD format, separating the stream into
114 its component parts, luminance and chrominance, and output it in
115 some digital video standard, with appropriate timing signals.
117 * - ``MEDIA_ENT_F_TUNER``
118 - Digital TV, analog TV, radio and/or software radio tuner, with
119 consists on a PLL tuning stage that converts radio frequency (RF)
120 signal into an Intermediate Frequency (IF). Modern tuners have
121 internally IF-PLL decoders for audio and video, but older models
122 have those stages implemented on separate entities.
124 * - ``MEDIA_ENT_F_IF_VID_DECODER``
125 - IF-PLL video decoder. It receives the IF from a PLL and decodes
126 the analog TV video signal. This is commonly found on some very
127 old analog tuners, like Philips MK3 designs. They all contain a
128 tda9887 (or some software compatible similar chip, like tda9885).
129 Those devices use a different I2C address than the tuner PLL.
131 * - ``MEDIA_ENT_F_IF_AUD_DECODER``
132 - IF-PLL sound decoder. It receives the IF from a PLL and decodes
133 the analog TV audio signal. This is commonly found on some very
134 old analog hardware, like Micronas msp3400, Philips tda9840,
135 tda985x, etc. Those devices use a different I2C address than the
136 tuner PLL and should be controlled together with the IF-PLL video
139 * - ``MEDIA_ENT_F_AUDIO_CAPTURE``
140 - Audio Capture Function Entity.
142 * - ``MEDIA_ENT_F_AUDIO_PLAYBACK``
143 - Audio Playback Function Entity.
145 * - ``MEDIA_ENT_F_AUDIO_MIXER``
146 - Audio Mixer Function Entity.
148 * - ``MEDIA_ENT_F_PROC_VIDEO_COMPOSER``
149 - Video composer (blender). An entity capable of video
150 composing must have at least two sink pads and one source
151 pad, and composes input video frames onto output video
152 frames. Composition can be performed using alpha blending,
153 color keying, raster operations (ROP), stitching or any other
156 * - ``MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER``
157 - Video pixel formatter. An entity capable of pixel formatting
158 must have at least one sink pad and one source pad. Read
159 pixel formatters read pixels from memory and perform a subset
160 of unpacking, cropping, color keying, alpha multiplication
161 and pixel encoding conversion. Write pixel formatters perform
162 a subset of dithering, pixel encoding conversion and packing
163 and write pixels to memory.
165 * - ``MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV``
166 - Video pixel encoding converter. An entity capable of pixel
167 enconding conversion must have at least one sink pad and one
168 source pad, and convert the encoding of pixels received on
169 its sink pad(s) to a different encoding output on its source
170 pad(s). Pixel encoding conversion includes but isn't limited
171 to RGB to/from HSV, RGB to/from YUV and CFA (Bayer) to RGB
174 * - ``MEDIA_ENT_F_PROC_VIDEO_LUT``
175 - Video look-up table. An entity capable of video lookup table
176 processing must have one sink pad and one source pad. It uses
177 the values of the pixels received on its sink pad to look up
178 entries in internal tables and output them on its source pad.
179 The lookup processing can be performed on all components
180 separately or combine them for multi-dimensional table
183 * - ``MEDIA_ENT_F_PROC_VIDEO_SCALER``
184 - Video scaler. An entity capable of video scaling must have
185 at least one sink pad and one source pad, and scale the
186 video frame(s) received on its sink pad(s) to a different
187 resolution output on its source pad(s). The range of
188 supported scaling ratios is entity-specific and can differ
189 between the horizontal and vertical directions (in particular
190 scaling can be supported in one direction only). Binning and
191 sub-sampling (occasionally also referred to as skipping) are
192 considered as scaling.
194 * - ``MEDIA_ENT_F_PROC_VIDEO_STATISTICS``
195 - Video statistics computation (histogram, 3A, etc.). An entity
196 capable of statistics computation must have one sink pad and
197 one source pad. It computes statistics over the frames
198 received on its sink pad and outputs the statistics data on
201 * - ``MEDIA_ENT_F_PROC_VIDEO_ENCODER``
202 - Video (MPEG, HEVC, VPx, etc.) encoder. An entity capable of
203 compressing video frames. Must have one sink pad and at least
206 * - ``MEDIA_ENT_F_PROC_VIDEO_DECODER``
207 - Video (MPEG, HEVC, VPx, etc.) decoder. An entity capable of
208 decompressing a compressed video stream into uncompressed video
209 frames. Must have one sink pad and at least one source pad.
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{5.0cm}|
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 and the pad is linked to any other pad, then
379 at least one of those links must be enabled for the entity to be
380 able to stream. There could be temporary reasons (e.g. device
381 configuration dependent) for the pad to need enabled links even
382 when this flag isn't set; the absence of the flag doesn't imply
386 One and only one of ``MEDIA_PAD_FL_SINK`` and ``MEDIA_PAD_FL_SOURCE``
387 must be set for every pad.
389 .. tabularcolumns:: |p{5.5cm}|p{12.0cm}|
392 .. _MEDIA-LNK-FL-ENABLED:
393 .. _MEDIA-LNK-FL-IMMUTABLE:
394 .. _MEDIA-LNK-FL-DYNAMIC:
395 .. _MEDIA-LNK-FL-LINK-TYPE:
397 .. flat-table:: Media link flags
401 * - ``MEDIA_LNK_FL_ENABLED``
402 - The link is enabled and can be used to transfer media data. When
403 two or more links target a sink pad, only one of them can be
406 * - ``MEDIA_LNK_FL_IMMUTABLE``
407 - The link enabled state can't be modified at runtime. An immutable
408 link is always enabled.
410 * - ``MEDIA_LNK_FL_DYNAMIC``
411 - The link enabled state can be modified during streaming. This flag
412 is set by drivers and is read-only for applications.
414 * - ``MEDIA_LNK_FL_LINK_TYPE``
415 - This is a bitmask that defines the type of the link. Currently,
416 two types of links are supported:
418 .. _MEDIA-LNK-FL-DATA-LINK:
420 ``MEDIA_LNK_FL_DATA_LINK`` if the link is between two pads
422 .. _MEDIA-LNK-FL-INTERFACE-LINK:
424 ``MEDIA_LNK_FL_INTERFACE_LINK`` if the link is between an
425 interface and an entity