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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>
109 lines
2.1 KiB
ReStructuredText
109 lines
2.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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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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Name
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----
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DVB demux open()
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Synopsis
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--------
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.. cpp:function:: int open(const char *deviceName, int flags)
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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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- const char \*deviceName
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- Name of demux device.
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- .. row 2
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- int flags
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- A bit-wise OR of the following flags:
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- .. row 3
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-
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- O_RDWR read/write access
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- .. row 4
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-
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- O_NONBLOCK open in non-blocking mode
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- .. row 5
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-
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- (blocking mode is the default)
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Description
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-----------
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This system call, used with a device name of /dev/dvb/adapter0/demux0,
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allocates a new filter and returns a handle which can be used for
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subsequent control of that filter. This call has to be made for each
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filter to be used, i.e. every returned file descriptor is a reference to
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a single filter. /dev/dvb/adapter0/dvr0 is a logical device to be used
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for retrieving Transport Streams for digital video recording. When
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reading from this device a transport stream containing the packets from
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all PES filters set in the corresponding demux device
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(/dev/dvb/adapter0/demux0) having the output set to DMX_OUT_TS_TAP. A
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recorded Transport Stream is replayed by writing to this device.
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The significance of blocking or non-blocking mode is described in the
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documentation for functions where there is a difference. It does not
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affect the semantics of the open() call itself. A device opened in
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blocking mode can later be put into non-blocking mode (and vice versa)
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using the F_SETFL command of the fcntl system call.
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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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- ``ENODEV``
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- Device driver not loaded/available.
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- .. row 2
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- ``EINVAL``
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- Invalid argument.
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- .. row 3
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- ``EMFILE``
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- “Too many open files”, i.e. no more filters available.
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- .. row 4
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- ``ENOMEM``
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- The driver failed to allocate enough memory.
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