Hi all,
could somebody advise on how to omit capturing of a muted sound in the
following situation?
There's an application that check presence of auto-initiated audio on some
web pages.
The application prepares environment (creates appropriate ~/.asoundrc file),
launches a browser,
opens a web page in the browser, waits some time, closes the browser, and
checks presence
of file with captured audio stream.
Here's content of ~/.asoundrc file:
pcm.app_writer {
type file
slave {
pcm null
}
file { @func getenv
vars [ APP_AUDIO_FILE ]
default "/dev/null"
}
format "wav"
}
pcm_slave.app_converter {
pcm app_writer
format u8
channels 1
rate 100
}
pcm.app_transmitter {
type plug
slave app_converter
}
pcm.!default {
@func refer
name { @func concat
strings [ "pcm."
{ @func getenv
vars [ ALSA_DEFAULT_PCM ]
default null
}
]
}
}
Here're CLI commands used to launch the browser:
export APP_AUDIO_FILE=/tmp/sound
export ALSA_DEFAULT_PCM=app_transmitter
firefox <http://...> &
And everything works properly... except one thing: in case a muted flash
movie is played on
web page then the corresponding audio stream is redirected into /tmp/sound
as well.
(But I'd like to capture not muted sound only).
So, is there a way to capture not muted sound only? E.g. (random ideas):
a) Modify ~/.asoundrc file so that it doesn't redirect audio stream into
APP_AUDIO_FILE
in case sound is muted.
b) Ask ALSA about current audio settings of flash player before closing the
browser.
--
Alexander O. Kobernik
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