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60c2820d0f
The name of the subsystem is "media", and not "linux_tv". Also, as we plan to add other stuff there in the future, let's rename also the media uAPI book to media_uapi, to make it clearer. No functional changes. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
90 lines
1.7 KiB
ReStructuredText
90 lines
1.7 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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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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Name
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----
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DVB demux write()
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Synopsis
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--------
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.. cpp:function:: ssize_t write(int fd, const void *buf, size_t count)
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Arguments
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---------
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- int fd
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- File descriptor returned by a previous call to open().
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- .. row 2
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- void \*buf
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- Pointer to the buffer containing the Transport Stream.
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- .. row 3
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- size_t count
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- Size of buf.
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Description
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-----------
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This system call is only provided by the logical device
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/dev/dvb/adapter0/dvr0, associated with the physical demux device that
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provides the actual DVR functionality. It is used for replay of a
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digitally recorded Transport Stream. Matching filters have to be defined
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in the corresponding physical demux device, /dev/dvb/adapter0/demux0.
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The amount of data to be transferred is implied by count.
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Return Value
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------------
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- ``EWOULDBLOCK``
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- No data was written. This might happen if O_NONBLOCK was
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specified and there is no more buffer space available (if
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O_NONBLOCK is not specified the function will block until buffer
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space is available).
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- .. row 2
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- ``EBUSY``
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- This error code indicates that there are conflicting requests. The
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corresponding demux device is setup to receive data from the
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front- end. Make sure that these filters are stopped and that the
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filters with input set to DMX_IN_DVR are started.
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- .. row 3
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- ``EBADF``
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- fd is not a valid open file descriptor.
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