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media: dvb uAPI docs: Prefer use "Digital TV instead of "DVB"
The usage of the term "DVB" at the dvb API docs is confusing, as, right now, it can refer to either the European digital TV standard or to the subsystem. So, prefer calling it as "Digital TV" on most places, to avoid ambiguity. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
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699f19e3f1
@ -44,7 +44,7 @@ Arguments
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Description
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-----------
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This ioctl is for DVB devices only. To control a V4L2 decoder use the
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This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
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V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK`` control instead.
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This ioctl call asks the Audio Device to select the requested channel if
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@ -2,14 +2,14 @@
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.. _audio_fclose:
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=================
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DVB audio close()
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=================
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========================
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Digital TV audio close()
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========================
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Name
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----
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DVB audio close()
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Digital TV audio close()
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.. attention:: This ioctl is deprecated
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@ -2,14 +2,14 @@
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.. _audio_fopen:
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================
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DVB audio open()
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================
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=======================
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Digital TV audio open()
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=======================
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Name
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----
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DVB audio open()
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Digital TV audio open()
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.. attention:: This ioctl is deprecated
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@ -2,14 +2,14 @@
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.. _audio_fwrite:
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=================
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DVB audio write()
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=================
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=========================
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Digital TV audio write()
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=========================
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Name
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----
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DVB audio write()
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Digital TV audio write()
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.. attention:: This ioctl is deprecated
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@ -38,7 +38,7 @@ Arguments
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- boolean state
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- Tells the DVB subsystem if A/V synchronization shall be ON or OFF.
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- Tells the Digital TV subsystem if A/V synchronization shall be ON or OFF.
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TRUE: AV-sync ON
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@ -38,7 +38,7 @@ Arguments
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- boolean mode
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- Enables or disables the decoding of the current Audio stream in
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the DVB subsystem.
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the Digital TV subsystem.
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TRUE: Bypass is disabled
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@ -50,8 +50,8 @@ Description
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This ioctl call asks the Audio Device to bypass the Audio decoder and
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forward the stream without decoding. This mode shall be used if streams
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that can’t be handled by the DVB system shall be decoded. Dolby
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DigitalTM streams are automatically forwarded by the DVB subsystem if
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that can’t be handled by the Digial TV system shall be decoded. Dolby
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DigitalTM streams are automatically forwarded by the Digital TV subsystem if
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the hardware can handle it.
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@ -48,7 +48,7 @@ Arguments
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Description
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-----------
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This ioctl is for DVB devices only. To control a V4L2 decoder use the
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This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
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V4L2 :ref:`VIDIOC_DECODER_CMD` with the
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``V4L2_DEC_CMD_START_MUTE_AUDIO`` flag instead.
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@ -2,15 +2,16 @@
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.. _dvb_audio:
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################
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DVB Audio Device
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################
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The DVB audio device controls the MPEG2 audio decoder of the DVB
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hardware. It can be accessed through ``/dev/dvb/adapter?/audio?``. Data
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#######################
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Digital TV Audio Device
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#######################
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The Digital TV audio device controls the MPEG2 audio decoder of the Digital
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TV hardware. It can be accessed through ``/dev/dvb/adapter?/audio?``. Data
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types and and ioctl definitions can be accessed by including
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``linux/dvb/audio.h`` in your application.
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Please note that some DVB cards don’t have their own MPEG decoder, which
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Please note that some Digital TV cards don’t have their own MPEG decoder, which
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results in the omission of the audio and video device.
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These ioctls were also used by V4L2 to control MPEG decoders implemented
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@ -2,14 +2,14 @@
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.. _ca_fclose:
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==============
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DVB CA close()
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==============
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=====================
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Digital TV CA close()
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=====================
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Name
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----
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DVB CA close()
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Digital TV CA close()
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Synopsis
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@ -2,14 +2,14 @@
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.. _ca_fopen:
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=============
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DVB CA open()
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=============
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====================
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Digital TV CA open()
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====================
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Name
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----
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DVB CA open()
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Digital TV CA open()
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Synopsis
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@ -23,7 +23,7 @@ Arguments
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---------
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``name``
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Name of specific DVB CA device.
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Name of specific Digital TV CA device.
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``flags``
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A bit-wise OR of the following flags:
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@ -2,11 +2,12 @@
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.. _dvb_ca:
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#############
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DVB CA Device
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#############
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The DVB CA device controls the conditional access hardware. It can be
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accessed through ``/dev/dvb/adapter?/ca?``. Data types and and ioctl
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####################
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Digital TV CA Device
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####################
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The Digital TV CA device controls the conditional access hardware. It
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can be accessed through ``/dev/dvb/adapter?/ca?``. Data types and and ioctl
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definitions can be accessed by including ``linux/dvb/ca.h`` in your
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application.
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@ -2,10 +2,15 @@
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.. _dvb_demux:
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################
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DVB Demux Device
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################
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The DVB demux device controls the filters of the DVB hardware/software.
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#######################
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Digital TV Demux Device
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#######################
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The Digital TV demux device controls the MPEG-TS filters for the
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digital TV. If the driver and hardware supports, those filters are
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implemented at the hardware. Otherwise, the Kernel provides a software
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emulation.
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It can be accessed through ``/dev/adapter?/demux?``. Data types and and
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ioctl definitions can be accessed by including ``linux/dvb/dmx.h`` in
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your application.
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@ -2,14 +2,14 @@
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.. _dmx_fclose:
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=================
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DVB demux close()
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=================
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========================
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Digital TV demux close()
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========================
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Name
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----
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DVB demux close()
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Digital TV demux close()
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Synopsis
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@ -2,14 +2,14 @@
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.. _dmx_fopen:
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================
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DVB demux open()
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================
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=======================
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Digital TV demux open()
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=======================
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Name
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----
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DVB demux open()
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Digital TV demux open()
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Synopsis
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@ -22,7 +22,7 @@ Arguments
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---------
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``name``
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Name of specific DVB demux device.
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Name of specific Digital TV demux device.
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``flags``
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A bit-wise OR of the following flags:
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@ -2,14 +2,14 @@
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.. _dmx_fread:
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================
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DVB demux read()
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================
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=======================
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Digital TV demux read()
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=======================
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Name
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----
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DVB demux read()
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Digital TV demux read()
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Synopsis
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@ -2,14 +2,14 @@
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.. _dmx_fwrite:
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=================
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DVB demux write()
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=================
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========================
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Digital TV demux write()
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========================
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Name
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----
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DVB demux write()
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Digital TV demux write()
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Synopsis
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@ -10,8 +10,21 @@ Part II - Digital TV API
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.. note::
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This API is also known as **DVB API**, although it is generic
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enough to support all digital TV standards.
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This API is also known as Linux **DVB API**.
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It it was originally written to support the European digital TV
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standard (DVB), and later extended to support all digital TV standards.
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In order to avoid confusion, within this document, it was opted to refer to
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it, and to associated hardware as **Digital TV**.
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The word **DVB** is reserved to be used for:
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- the Digital TV API version
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(e. g. DVB API version 3 or DVB API version 5);
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- digital TV data types (enums, structs, defines, etc);
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- digital TV device nodes (``/dev/dvb/...``);
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- the European DVB standard.
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**Version 5.10**
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@ -41,11 +54,11 @@ Authors:
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- J. K. Metzler, Ralph <rjkm@metzlerbros.de>
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- Original author of the DVB API documentation.
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- Original author of the Digital TV API documentation.
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- O. C. Metzler, Marcus <rjkm@metzlerbros.de>
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- Original author of the DVB API documentation.
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- Original author of the Digital TV API documentation.
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- Carvalho Chehab, Mauro <m.chehab@kernel.org>
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@ -63,11 +76,11 @@ Revision History
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DocBook improvements and cleanups, in order to document the system calls
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on a more standard way and provide more description about the current
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DVB API.
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Digital TV API.
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:revision: 2.0.4 / 2011-05-06 (*mcc*)
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Add more information about DVB APIv5, better describing the frontend
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Add more information about DVBv5 API, better describing the frontend
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GET/SET props ioctl's.
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@ -13,7 +13,7 @@ antenna subsystem via Satellite Equipment Control - SEC (on satellite
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systems). The actual parameters are specific to each particular digital
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TV standards, and may change as the digital TV specs evolves.
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In the past (up to DVB API version 3), the strategy used was to have a
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In the past (up to DVB API version 3 - DVBv3), the strategy used was to have a
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union with the parameters needed to tune for DVB-S, DVB-C, DVB-T and
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ATSC delivery systems grouped there. The problem is that, as the second
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generation standards appeared, the size of such union was not big
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@ -41,7 +41,7 @@ with supports all digital TV delivery systems.
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support to new standards and/or new hardware.
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3. Nowadays, most frontends support multiple delivery systems.
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Only with DVB v5 calls it is possible to switch between
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Only with DVB API version 5 calls it is possible to switch between
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the multiple delivery systems supported by a frontend.
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4. DVB API version 5 is also called *S2API*, as the first
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@ -6,8 +6,8 @@
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Examples
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********
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In this section we would like to present some examples for using the DVB
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API.
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In this section we would like to present some examples for using the Digital
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TV API.
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.. note::
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@ -31,7 +31,7 @@ Description
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If the bus has been automatically powered off due to power overload,
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this ioctl call restores the power to the bus. The call requires
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read/write access to the device. This call has no effect if the device
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is manually powered off. Not all DVB adapters support this ioctl.
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is manually powered off. Not all Digital TV adapters support this ioctl.
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Return Value
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@ -9,7 +9,8 @@ ioctl FE_GET_INFO
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Name
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====
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FE_GET_INFO - Query DVB frontend capabilities and returns information about the - front-end. This call only requires read-only access to the device
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FE_GET_INFO - Query Digital TV frontend capabilities and returns information
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about the - front-end. This call only requires read-only access to the device.
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Synopsis
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@ -33,7 +34,7 @@ Arguments
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Description
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===========
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All DVB frontend devices support the ``FE_GET_INFO`` ioctl. It is used
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All Digital TV frontend devices support the ``FE_GET_INFO`` ioctl. It is used
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to identify kernel devices compatible with this specification and to
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obtain information about driver and hardware capabilities. The ioctl
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takes a pointer to dvb_frontend_info which is filled by the driver.
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@ -35,7 +35,7 @@ Arguments
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Description
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===========
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All DVB frontend devices support the ``FE_SET_PROPERTY`` and
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All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and
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``FE_GET_PROPERTY`` ioctls. The supported properties and statistics
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depends on the delivery system and on the device:
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@ -33,7 +33,7 @@ Arguments
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Description
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===========
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All DVB frontend devices support the ``FE_READ_STATUS`` ioctl. It is
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All Digital TV frontend devices support the ``FE_READ_STATUS`` ioctl. It is
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used to check about the locking status of the frontend after being
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tuned. The ioctl takes a pointer to an integer where the status will be
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written.
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@ -819,7 +819,7 @@ Possible values are the same as documented on enum
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DTV_API_VERSION
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===============
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Returns the major/minor version of the DVB API
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Returns the major/minor version of the Digital TV API
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.. _DTV-CODE-RATE-HP:
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@ -919,7 +919,7 @@ DTV_STREAM_ID
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Used on DVB-S2, DVB-T2 and ISDB-S.
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DVB-S2, DVB-T2 and ISDB-S support the transmission of several streams on
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a single transport stream. This property enables the DVB driver to
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a single transport stream. This property enables the digital TV driver to
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handle substream filtering, when supported by the hardware. By default,
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substream filtering is disabled.
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@ -100,7 +100,7 @@ to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible that some
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very sophisticated devices won't need certain parameters to tune.
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The information given here should help application writers to know how
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to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.
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to handle ISDB-T and ISDB-Tsb hardware using the Linux Digital TV API.
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The details given here about ISDB-T and ISDB-Tsb are just enough to
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basically show the dependencies between the needed parameter values, but
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@ -2,11 +2,11 @@
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.. _dvb_frontend:
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################
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DVB Frontend API
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################
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#######################
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Digital TV Frontend API
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#######################
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The DVB frontend API was designed to support three groups of delivery
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The Digital TV frontend API was designed to support three groups of delivery
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systems: Terrestrial, cable and Satellite. Currently, the following
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delivery systems are supported:
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@ -17,7 +17,7 @@ delivery systems are supported:
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- Satellite systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS
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The DVB frontend controls several sub-devices including:
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The Digital TV frontend controls several sub-devices including:
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- Tuner
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@ -2,9 +2,9 @@
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.. _frontend_f_close:
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********************
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DVB frontend close()
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********************
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***************************
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Digital TV frontend close()
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***************************
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Name
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====
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@ -2,9 +2,9 @@
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.. _frontend_f_open:
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*******************
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DVB frontend open()
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*******************
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***************************
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Digital TV frontend open()
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***************************
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Name
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====
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@ -2,9 +2,9 @@
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.. _frontend_legacy_dvbv3_api:
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****************************************
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DVB Frontend legacy API (a. k. a. DVBv3)
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****************************************
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***********************************************
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Digital TV Frontend legacy API (a. k. a. DVBv3)
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***********************************************
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The usage of this API is deprecated, as it doesn't support all digital
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TV standards, doesn't provide good statistics measurements and provides
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@ -33,19 +33,19 @@ use ioctl calls. This also includes the knowledge of C or C++.
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History
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=======
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The first API for DVB cards we used at Convergence in late 1999 was an
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The first API for Digital TV cards we used at Convergence in late 1999 was an
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extension of the Video4Linux API which was primarily developed for frame
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grabber cards. As such it was not really well suited to be used for DVB
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cards and their new features like recording MPEG streams and filtering
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grabber cards. As such it was not really well suited to be used for Digital
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TV cards and their new features like recording MPEG streams and filtering
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several section and PES data streams at the same time.
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In early 2000, Convergence was approached by Nokia with a proposal for a new
|
||||
standard Linux DVB API. As a commitment to the development of terminals
|
||||
standard Linux Digital TV API. As a commitment to the development of terminals
|
||||
based on open standards, Nokia and Convergence made it available to all
|
||||
Linux developers and published it on https://linuxtv.org in September
|
||||
2000. With the Linux driver for the Siemens/Hauppauge DVB PCI card,
|
||||
Convergence provided a first implementation of the Linux DVB API.
|
||||
Convergence was the maintainer of the Linux DVB API in the early
|
||||
Convergence provided a first implementation of the Linux Digital TV API.
|
||||
Convergence was the maintainer of the Linux Digital TV API in the early
|
||||
days.
|
||||
|
||||
Now, the API is maintained by the LinuxTV community (i.e. you, the reader
|
||||
@ -88,7 +88,7 @@ Conditional Access (CA) hardware like CI adapters and smartcard slots
|
||||
|
||||
Not every digital TV hardware provides conditional access hardware.
|
||||
|
||||
Demultiplexer which filters the incoming DVB stream
|
||||
Demultiplexer which filters the incoming Digital TV MPEG-TS stream
|
||||
The demultiplexer splits the TS into its components like audio and
|
||||
video streams. Besides usually several of such audio and video
|
||||
streams it also contains data streams with information about the
|
||||
@ -124,8 +124,8 @@ The Linux Digital TV API lets you control these hardware components through
|
||||
currently six Unix-style character devices for video, audio, frontend,
|
||||
demux, CA and IP-over-DVB networking. The video and audio devices
|
||||
control the MPEG2 decoder hardware, the frontend device the tuner and
|
||||
the DVB demodulator. The demux device gives you control over the PES and
|
||||
section filters of the hardware. If the hardware does not support
|
||||
the Digital TV demodulator. The demux device gives you control over the PES
|
||||
and section filters of the hardware. If the hardware does not support
|
||||
filtering these filters can be implemented in software. Finally, the CA
|
||||
device controls all the conditional access capabilities of the hardware.
|
||||
It can depend on the individual security requirements of the platform,
|
||||
|
||||
@ -2,9 +2,9 @@
|
||||
|
||||
.. _legacy_dvb_apis:
|
||||
|
||||
*******************
|
||||
DVB Deprecated APIs
|
||||
*******************
|
||||
***************************
|
||||
Digital TV Deprecated APIs
|
||||
***************************
|
||||
|
||||
The APIs described here are kept only for historical reasons. There's
|
||||
just one driver for a very legacy hardware that uses this API. No modern
|
||||
|
||||
@ -64,7 +64,7 @@ filled with the number of the created interface.
|
||||
|
||||
- ifnum
|
||||
|
||||
- number of the DVB interface.
|
||||
- number of the Digital TV interface.
|
||||
|
||||
- .. row 4
|
||||
|
||||
|
||||
@ -2,10 +2,11 @@
|
||||
|
||||
.. _net:
|
||||
|
||||
###############
|
||||
DVB Network API
|
||||
###############
|
||||
The DVB net device controls the mapping of data packages that are part
|
||||
######################
|
||||
Digital TV Network API
|
||||
######################
|
||||
|
||||
The Digital TV net device controls the mapping of data packages that are part
|
||||
of a transport stream to be mapped into a virtual network interface,
|
||||
visible through the standard Linux network protocol stack.
|
||||
|
||||
@ -28,8 +29,8 @@ header.
|
||||
|
||||
.. _net_fcalls:
|
||||
|
||||
DVB net Function Calls
|
||||
######################
|
||||
Digital TV net Function Calls
|
||||
#############################
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
@ -9,5 +9,5 @@ Querying frontend information
|
||||
Usually, the first thing to do when the frontend is opened is to check
|
||||
the frontend capabilities. This is done using
|
||||
:ref:`FE_GET_INFO`. This ioctl will enumerate the
|
||||
DVB API version and other characteristics about the frontend, and can be
|
||||
opened either in read only or read/write mode.
|
||||
Digital TV API version and other characteristics about the frontend, and can
|
||||
be opened either in read only or read/write mode.
|
||||
|
||||
@ -44,7 +44,7 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. To control a V4L2 decoder use the
|
||||
This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
|
||||
V4L2 :ref:`VIDIOC_DECODER_CMD` instead.
|
||||
|
||||
This ioctl call restarts decoding and playing processes of the video
|
||||
|
||||
@ -44,14 +44,14 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. To control a V4L2 decoder use the
|
||||
This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
|
||||
V4L2 :ref:`VIDIOC_DECODER_CMD` instead.
|
||||
|
||||
This ioctl call suspends the live video stream being played. Decoding
|
||||
and playing are frozen. It is then possible to restart the decoding and
|
||||
playing process of the video stream using the VIDEO_CONTINUE command.
|
||||
If VIDEO_SOURCE_MEMORY is selected in the ioctl call
|
||||
VIDEO_SELECT_SOURCE, the DVB subsystem will not decode any more data
|
||||
VIDEO_SELECT_SOURCE, the Digital TV subsystem will not decode any more data
|
||||
until the ioctl call VIDEO_CONTINUE or VIDEO_PLAY is performed.
|
||||
|
||||
|
||||
|
||||
@ -50,7 +50,7 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. To get events from a V4L2 decoder
|
||||
This ioctl is for Digital TV devices only. To get events from a V4L2 decoder
|
||||
use the V4L2 :ref:`VIDIOC_DQEVENT` ioctl instead.
|
||||
|
||||
This ioctl call returns an event of type video_event if available. If
|
||||
|
||||
@ -44,7 +44,7 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. To control a V4L2 decoder use the
|
||||
This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
|
||||
V4L2 :ref:`VIDIOC_DECODER_CMD` instead.
|
||||
|
||||
This ioctl call asks the Video Device to start playing a video stream
|
||||
|
||||
@ -50,7 +50,7 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. This ioctl was also supported by the
|
||||
This ioctl is for Digital TV devices only. This ioctl was also supported by the
|
||||
V4L2 ivtv driver, but that has been replaced by the ivtv-specific
|
||||
``IVTV_IOC_PASSTHROUGH_MODE`` ioctl.
|
||||
|
||||
|
||||
@ -60,7 +60,7 @@ Arguments
|
||||
Description
|
||||
-----------
|
||||
|
||||
This ioctl is for DVB devices only. To control a V4L2 decoder use the
|
||||
This ioctl is for Digital TV devices only. To control a V4L2 decoder use the
|
||||
V4L2 :ref:`VIDIOC_DECODER_CMD` instead.
|
||||
|
||||
This ioctl call asks the Video Device to stop playing the current
|
||||
|
||||
@ -2,20 +2,21 @@
|
||||
|
||||
.. _dvb_video:
|
||||
|
||||
################
|
||||
DVB Video Device
|
||||
################
|
||||
The DVB video device controls the MPEG2 video decoder of the DVB
|
||||
hardware. It can be accessed through **/dev/dvb/adapter0/video0**. Data
|
||||
#######################
|
||||
Digital TV Video Device
|
||||
#######################
|
||||
|
||||
The Digital TV video device controls the MPEG2 video decoder of the Digital
|
||||
TV hardware. It can be accessed through **/dev/dvb/adapter0/video0**. Data
|
||||
types and and ioctl definitions can be accessed by including
|
||||
**linux/dvb/video.h** in your application.
|
||||
|
||||
Note that the DVB video device only controls decoding of the MPEG video
|
||||
Note that the Digital TV video device only controls decoding of the MPEG video
|
||||
stream, not its presentation on the TV or computer screen. On PCs this
|
||||
is typically handled by an associated video4linux device, e.g.
|
||||
**/dev/video**, which allows scaling and defining output windows.
|
||||
|
||||
Some DVB cards don’t have their own MPEG decoder, which results in the
|
||||
Some Digital TV cards don’t have their own MPEG decoder, which results in the
|
||||
omission of the audio and video device as well as the video4linux
|
||||
device.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user