sound/cards/pcmtest.rst

1 .. SPDX-License-Identifier: GPL-2.0
16 	* Generate random or pattern-based capturing data
21 non-interleaved access modes.
24 which is used in the corresponding selftest (alsa/pcmtest-test.sh) to check the PCM middle
29 -------------
33 	* fill_mode (bool) - Buffer fill mode (see below)
41 -----------------------
44 means random data generation, the second (1 in the fill_mode) - pattern-based
51 	* /sys/kernel/debug/pcmtest/fill_pattern[0-3]
52 	* /sys/kernel/debug/pcmtest/fill_pattern[0-3]_len
56 .. code-block:: bash
58 	echo -n mycoolpattern > /sys/kernel/debug/pcmtest/fill_pattern0
66 ---------------
68 The driver has 'inject_delay' parameter, which has very self-descriptive name and
73 negative - faster. You can try it yourself by starting a recording in any
81 ----------------
90 .. code-block:: bash
101 -------------
103 This driver can be also used for the playback functionality testing - every time you
110 -----------------------
116 .. code-block:: bash