MEDIA_ENT_F_UNKNOWN and MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN Unknown entity. That generally indicates that a driver didn't initialize properly the entity, with is a Kernel bug MEDIA_ENT_F_IO_V4L Data streaming input and/or output entity. MEDIA_ENT_F_IO_VBI V4L VBI streaming input or output entity MEDIA_ENT_F_IO_SWRADIO V4L Software Digital Radio (SDR) streaming input or output entity MEDIA_ENT_F_IO_DTV DVB Digital TV streaming input or output entity MEDIA_ENT_F_DTV_DEMOD Digital TV demodulator entity. MEDIA_ENT_F_TS_DEMUX MPEG Transport stream demux entity. Could be implemented on hardware or in Kernelspace by the Linux DVB subsystem. MEDIA_ENT_F_DTV_CA Digital TV Conditional Access module (CAM) entity MEDIA_ENT_F_DTV_NET_DECAP Digital TV network ULE/MLE desencapsulation entity. Could be implemented on hardware or in Kernelspace MEDIA_ENT_F_CONN_RF Connector for a Radio Frequency (RF) signal. MEDIA_ENT_F_CONN_SVIDEO Connector for a S-Video signal. MEDIA_ENT_F_CONN_COMPOSITE Connector for a RGB composite signal. MEDIA_ENT_F_CAM_SENSOR Camera video sensor entity. MEDIA_ENT_F_FLASH Flash controller entity. MEDIA_ENT_F_LENS Lens controller entity. MEDIA_ENT_F_ATV_DECODER 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. MEDIA_ENT_F_TUNER 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. MEDIA_ENT_F_IF_VID_DECODER 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. MEDIA_ENT_F_IF_AUD_DECODER 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. MEDIA_ENT_F_AUDIO_CAPTURE Audio Capture Function Entity. MEDIA_ENT_F_AUDIO_PLAYBACK Audio Playback Function Entity. MEDIA_ENT_F_AUDIO_MIXER Audio Mixer Function Entity. MEDIA_ENT_FL_DEFAULT Default entity for its type. Used to discover the default audio, VBI and video devices, the default camera sensor, ... MEDIA_ENT_FL_CONNECTOR The entity represents a data conector MEDIA_INTF_T_DVB_FE Device node interface for the Digital TV frontend typically, /dev/dvb/adapter?/frontend? MEDIA_INTF_T_DVB_DEMUX Device node interface for the Digital TV demux typically, /dev/dvb/adapter?/demux? MEDIA_INTF_T_DVB_DVR Device node interface for the Digital TV DVR typically, /dev/dvb/adapter?/dvr? MEDIA_INTF_T_DVB_CA Device node interface for the Digital TV Conditional Access typically, /dev/dvb/adapter?/ca? MEDIA_INTF_T_DVB_FE Device node interface for the Digital TV network control typically, /dev/dvb/adapter?/net? MEDIA_INTF_T_V4L_VIDEO Device node interface for video (V4L) typically, /dev/video? MEDIA_INTF_T_V4L_VBI Device node interface for VBI (V4L) typically, /dev/vbi? MEDIA_INTF_T_V4L_RADIO Device node interface for radio (V4L) typically, /dev/vbi? MEDIA_INTF_T_V4L_SUBDEV Device node interface for a V4L subdevice typically, /dev/v4l-subdev? MEDIA_INTF_T_V4L_SWRADIO Device node interface for Software Defined Radio (V4L) typically, /dev/swradio? MEDIA_INTF_T_ALSA_PCM_CAPTURE Device node interface for ALSA PCM Capture typically, /dev/snd/pcmC?D?c MEDIA_INTF_T_ALSA_PCM_PLAYBACK Device node interface for ALSA PCM Playback typically, /dev/snd/pcmC?D?p MEDIA_INTF_T_ALSA_CONTROL Device node interface for ALSA Control typically, /dev/snd/controlC? MEDIA_INTF_T_ALSA_COMPRESS Device node interface for ALSA Compress typically, /dev/snd/compr? MEDIA_INTF_T_ALSA_RAWMIDI Device node interface for ALSA Raw MIDI typically, /dev/snd/midi? MEDIA_INTF_T_ALSA_HWDEP Device node interface for ALSA Hardware Dependent typically, /dev/snd/hwC?D? MEDIA_INTF_T_ALSA_SEQUENCER Device node interface for ALSA Sequencer typically, /dev/snd/seq MEDIA_INTF_T_ALSA_TIMER Device node interface for ALSA Timer typically, /dev/snd/timer MEDIA_PAD_FL_SINK Input pad, relative to the entity. Input pads sink data and are targets of links. MEDIA_PAD_FL_SOURCE Output pad, relative to the entity. Output pads source data and are origins of links. MEDIA_PAD_FL_MUST_CONNECT 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. One and only one of MEDIA_PAD_FL_SINK and MEDIA_PAD_FL_SOURCE must be set for every pad. MEDIA_LNK_FL_ENABLED 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. MEDIA_LNK_FL_IMMUTABLE The link enabled state can't be modified at runtime. An immutable link is always enabled. MEDIA_LNK_FL_DYNAMIC The link enabled state can be modified during streaming. This flag is set by drivers and is read-only for applications. MEDIA_LNK_FL_LINK_TYPE This is a bitmask that defines the type of the link. Currently, two types of links are supported: MEDIA_LNK_FL_DATA_LINK if the link is between two pads MEDIA_LNK_FL_INTERFACE_LINK if the link is between an interface and an entity