How to link sound-device names to the sound-driver?

[Ajay Garg]

Hi all.

I have actually two questions ::

a)
How can one get the know the sound-device name used by a particular sound-driver?

For eg., there are multiple entries in "/dev/snd" "virtual" filesystem on my machine; however, I am not sure as to which device-file is used by which driver?

I guess, there would be a way to do this via gstreamer-api; however, I am not sure. Doing it via a shell-script would be awesome



b)
Secondly, (more importantly), how can one "programmatically" find out as to which sound-device is functional?

I will take an example here ::

When I try "gst-launch filesrc location=/path/to/mp3 ! mad ! pulsesink", I am able to play the mp3 fine on one machine, but not on another, even though doing "pulseaudio --check" on both machines, gives "0" as the exit status.




So, in summary, I would like to know as to which all sound-device(s) is(are) functional, and then accordingly use the corresponding sound-driver(s) in my application.



Will be grateful for a reply.



Thanks and Regards,
Ajay
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[Sean McNamara-4]

On Sat, Jun 2, 2012 at 2:16 AM, Ajay Garg <[hidden email]> wrote:

Hi all.

I have actually two questions ::

a)
How can one get the know the sound-device name used by a particular sound-driver?

For eg., there are multiple entries in "/dev/snd" "virtual" filesystem on my machine; however, I am not sure as to which device-file is used by which driver?

I guess, there would be a way to do this via gstreamer-api; however, I am not sure. Doing it via a shell-script would be awesome



b)
Secondly, (more importantly), how can one "programmatically" find out as to which sound-device is functional?

I will take an example here ::

When I try "gst-launch filesrc location=/path/to/mp3 ! mad ! pulsesink", I am able to play the mp3 fine on one machine, but not on another, even though doing "pulseaudio --check" on both machines, gives "0" as the exit status.




So, in summary, I would like to know as to which all sound-device(s) is(are) functional, and then accordingly use the corresponding sound-driver(s) in my application.

If you're writing an application, the most you can do is either use the default sink, or allow the user to select a device from a dropdown list. Don't try to be "smart" and choose what you think is a working device for the user. 99% of the time you'll be wrong.

Also, /dev/snd/* devices are from ALSA, and have nothing to do with pulseaudio. Don't correlate one with the other; it can't be done. If you're supporting PulseAudio API, don't look at /dev/snd.

As a matter of fact, don't look at /dev/snd at all. Just ignore it like it isn't there. Just read this and understand it: http://0pointer.de/blog/projects/guide-to-sound-apis.html

 

Will be grateful for a reply.



Thanks and Regards,
Ajay
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[hidden email]
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