1 <section id="media-controller-types">
2 <title>Types and flags used to represent the media graph elements</title>
4 <table frame="none" pgwide="1" id="media-entity-type">
5 <title>Media entity types</title>
7 <colspec colname="c1"/>
8 <colspec colname="c2"/>
11 <entry><constant>MEDIA_ENT_F_UNKNOWN</constant> and <constant>MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN</constant></entry>
12 <entry>Unknown entity. That generally indicates that
13 a driver didn't initialize properly the entity, with is a Kernel bug</entry>
16 <entry><constant>MEDIA_ENT_F_IO_V4L</constant></entry>
17 <entry>Data streaming input and/or output entity.</entry>
20 <entry><constant>MEDIA_ENT_F_IO_VBI</constant></entry>
21 <entry>V4L VBI streaming input or output entity</entry>
24 <entry><constant>MEDIA_ENT_F_IO_SWRADIO</constant></entry>
25 <entry>V4L Software Digital Radio (SDR) streaming input or output entity</entry>
28 <entry><constant>MEDIA_ENT_F_IO_DTV</constant></entry>
29 <entry>DVB Digital TV streaming input or output entity</entry>
32 <entry><constant>MEDIA_ENT_F_DTV_DEMOD</constant></entry>
33 <entry>Digital TV demodulator entity.</entry>
36 <entry><constant>MEDIA_ENT_F_TS_DEMUX</constant></entry>
37 <entry>MPEG Transport stream demux entity. Could be implemented on hardware or in Kernelspace by the Linux DVB subsystem.</entry>
40 <entry><constant>MEDIA_ENT_F_DTV_CA</constant></entry>
41 <entry>Digital TV Conditional Access module (CAM) entity</entry>
44 <entry><constant>MEDIA_ENT_F_DTV_NET_DECAP</constant></entry>
45 <entry>Digital TV network ULE/MLE desencapsulation entity. Could be implemented on hardware or in Kernelspace</entry>
48 <entry><constant>MEDIA_ENT_F_CONN_RF</constant></entry>
49 <entry>Connector for a Radio Frequency (RF) signal.</entry>
52 <entry><constant>MEDIA_ENT_F_CONN_SVIDEO</constant></entry>
53 <entry>Connector for a S-Video signal.</entry>
56 <entry><constant>MEDIA_ENT_F_CONN_COMPOSITE</constant></entry>
57 <entry>Connector for a RGB composite signal.</entry>
60 <entry><constant>MEDIA_ENT_F_CONN_TEST</constant></entry>
61 <entry>Connector for a test generator.</entry>
64 <entry><constant>MEDIA_ENT_F_CAM_SENSOR</constant></entry>
65 <entry>Camera video sensor entity.</entry>
68 <entry><constant>MEDIA_ENT_F_FLASH</constant></entry>
69 <entry>Flash controller entity.</entry>
72 <entry><constant>MEDIA_ENT_F_LENS</constant></entry>
73 <entry>Lens controller entity.</entry>
76 <entry><constant>MEDIA_ENT_F_ATV_DECODER</constant></entry>
77 <entry>Analog video decoder, the basic function of the video decoder
78 is to accept analogue video from a wide variety of sources such as
79 broadcast, DVD players, cameras and video cassette recorders, in
80 either NTSC, PAL, SECAM or HD format, separating the stream
81 into its component parts, luminance and chrominance, and output
82 it in some digital video standard, with appropriate timing
86 <entry><constant>MEDIA_ENT_F_TUNER</constant></entry>
87 <entry>Digital TV, analog TV, radio and/or software radio tuner,
88 with consists on a PLL tuning stage that converts radio
89 frequency (RF) signal into an Intermediate Frequency (IF).
90 Modern tuners have internally IF-PLL decoders for audio
91 and video, but older models have those stages implemented
96 <entry><constant>MEDIA_ENT_F_IF_VID_DECODER</constant></entry>
97 <entry>IF-PLL video decoder. It receives the IF from a PLL
98 and decodes the analog TV video signal. This is commonly
99 found on some very old analog tuners, like Philips MK3
100 designs. They all contain a tda9887 (or some software
101 compatible similar chip, like tda9885). Those devices
102 use a different I2C address than the tuner PLL.
106 <entry><constant>MEDIA_ENT_F_IF_AUD_DECODER</constant></entry>
107 <entry>IF-PLL sound decoder. It receives the IF from a PLL
108 and decodes the analog TV audio signal. This is commonly
109 found on some very old analog hardware, like Micronas
110 msp3400, Philips tda9840, tda985x, etc. Those devices
111 use a different I2C address than the tuner PLL and
112 should be controlled together with the IF-PLL video
120 <table frame="none" pgwide="1" id="media-entity-flag">
121 <title>Media entity flags</title>
123 <colspec colname="c1"/>
124 <colspec colname="c2"/>
127 <entry><constant>MEDIA_ENT_FL_DEFAULT</constant></entry>
128 <entry>Default entity for its type. Used to discover the default
129 audio, VBI and video devices, the default camera sensor, ...</entry>
132 <entry><constant>MEDIA_ENT_FL_CONNECTOR</constant></entry>
133 <entry>The entity represents a data conector</entry>
139 <table frame="none" pgwide="1" id="media-intf-type">
140 <title>Media interface types</title>
142 <colspec colname="c1"/>
143 <colspec colname="c2"/>
144 <colspec colname="c3"/>
147 <entry><constant>MEDIA_INTF_T_DVB_FE</constant></entry>
148 <entry>Device node interface for the Digital TV frontend</entry>
149 <entry>typically, /dev/dvb/adapter?/frontend?</entry>
152 <entry><constant>MEDIA_INTF_T_DVB_DEMUX</constant></entry>
153 <entry>Device node interface for the Digital TV demux</entry>
154 <entry>typically, /dev/dvb/adapter?/demux?</entry>
157 <entry><constant>MEDIA_INTF_T_DVB_DVR</constant></entry>
158 <entry>Device node interface for the Digital TV DVR</entry>
159 <entry>typically, /dev/dvb/adapter?/dvr?</entry>
162 <entry><constant>MEDIA_INTF_T_DVB_CA</constant></entry>
163 <entry>Device node interface for the Digital TV Conditional Access</entry>
164 <entry>typically, /dev/dvb/adapter?/ca?</entry>
167 <entry><constant>MEDIA_INTF_T_DVB_FE</constant></entry>
168 <entry>Device node interface for the Digital TV network control</entry>
169 <entry>typically, /dev/dvb/adapter?/net?</entry>
172 <entry><constant>MEDIA_INTF_T_V4L_VIDEO</constant></entry>
173 <entry>Device node interface for video (V4L)</entry>
174 <entry>typically, /dev/video?</entry>
177 <entry><constant>MEDIA_INTF_T_V4L_VBI</constant></entry>
178 <entry>Device node interface for VBI (V4L)</entry>
179 <entry>typically, /dev/vbi?</entry>
182 <entry><constant>MEDIA_INTF_T_V4L_RADIO</constant></entry>
183 <entry>Device node interface for radio (V4L)</entry>
184 <entry>typically, /dev/vbi?</entry>
187 <entry><constant>MEDIA_INTF_T_V4L_SUBDEV</constant></entry>
188 <entry>Device node interface for a V4L subdevice</entry>
189 <entry>typically, /dev/v4l-subdev?</entry>
192 <entry><constant>MEDIA_INTF_T_V4L_SWRADIO</constant></entry>
193 <entry>Device node interface for Software Defined Radio (V4L)</entry>
194 <entry>typically, /dev/swradio?</entry>
200 <table frame="none" pgwide="1" id="media-pad-flag">
201 <title>Media pad flags</title>
203 <colspec colname="c1"/>
204 <colspec colname="c2"/>
207 <entry><constant>MEDIA_PAD_FL_SINK</constant></entry>
208 <entry>Input pad, relative to the entity. Input pads sink data and
209 are targets of links.</entry>
212 <entry><constant>MEDIA_PAD_FL_SOURCE</constant></entry>
213 <entry>Output pad, relative to the entity. Output pads source data
214 and are origins of links.</entry>
217 <entry><constant>MEDIA_PAD_FL_MUST_CONNECT</constant></entry>
218 <entry>If this flag is set and the pad is linked to any other
219 pad, then at least one of those links must be enabled for the
220 entity to be able to stream. There could be temporary reasons
221 (e.g. device configuration dependent) for the pad to need
222 enabled links even when this flag isn't set; the absence of the
223 flag doesn't imply there is none.</entry>
229 <para>One and only one of <constant>MEDIA_PAD_FL_SINK</constant> and
230 <constant>MEDIA_PAD_FL_SOURCE</constant> must be set for every pad.</para>
232 <table frame="none" pgwide="1" id="media-link-flag">
233 <title>Media link flags</title>
235 <colspec colname="c1"/>
236 <colspec colname="c2"/>
239 <entry><constant>MEDIA_LNK_FL_ENABLED</constant></entry>
240 <entry>The link is enabled and can be used to transfer media data.
241 When two or more links target a sink pad, only one of them can be
242 enabled at a time.</entry>
245 <entry><constant>MEDIA_LNK_FL_IMMUTABLE</constant></entry>
246 <entry>The link enabled state can't be modified at runtime. An
247 immutable link is always enabled.</entry>
250 <entry><constant>MEDIA_LNK_FL_DYNAMIC</constant></entry>
251 <entry>The link enabled state can be modified during streaming. This
252 flag is set by drivers and is read-only for applications.</entry>
255 <entry><constant>MEDIA_LNK_FL_LINK_TYPE</constant></entry>
256 <entry><para>This is a bitmask that defines the type of the link.
257 Currently, two types of links are supported:</para>
258 <para><constant>MEDIA_LNK_FL_DATA_LINK</constant>
259 if the link is between two pads</para>
260 <para><constant>MEDIA_LNK_FL_INTERFACE_LINK</constant>
261 if the link is between an interface and an entity</para></entry>