[alsa-devel] snd_pcm_open device names
with snd_pcm_open (handle, "default", SND_PCM_STREAM_PLAYBACK, 0) I can open a device twice with snd_pcm_open (handle, "plughw:0,0", SND_PCM_STREAM_PLAYBACK, 0) the 2. call fails with error -16.
The docu says: The default device is equal to plug plugin with hw plugin as slave.
???? Reiner
On Thursday 06 March 2008 12:33:54 Reiner wrote:
with snd_pcm_open (handle, "default", SND_PCM_STREAM_PLAYBACK, 0) I can open a device twice with snd_pcm_open (handle, "plughw:0,0", SND_PCM_STREAM_PLAYBACK, 0) the 2. call fails with error -16.
The docu says: The default device is equal to plug plugin with hw plugin as slave.
Probably the doc is in error. The default device these days is usually asym (dmix+dsnoop) which allows the multiple opens.
-- Eliot www.audioscience.com
Thanks! But if I try "asym" open fails, where can I see what "default" is? There is no ~/.asoundrc and in /etc there is only asound.state. By the way I'am looking for a function to adjust the volume of the stream, any idea
Thanks Reiner
Eliot Blennerhassett schrieb:
On Thursday 06 March 2008 12:33:54 Reiner wrote:
with snd_pcm_open (handle, "default", SND_PCM_STREAM_PLAYBACK, 0) I can open a device twice with snd_pcm_open (handle, "plughw:0,0", SND_PCM_STREAM_PLAYBACK, 0) the 2. call fails with error -16.
The docu says: The default device is equal to plug plugin with hw plugin as slave.
Probably the doc is in error. The default device these days is usually asym (dmix+dsnoop) which allows the multiple opens.
-- Eliot www.audioscience.com _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
On Thu, Mar 6, 2008 at 1:34 PM, Reiner reiner1210@googlemail.com wrote:
Thanks! But if I try "asym" open fails, where can I see what "default" is? There is no ~/.asoundrc and in /etc there is only asound.state. By the way I'am looking for a function to adjust the volume of the stream, any idea
There is no per stream volume control in ALSA. This should be handled by the application, or a sound server like Pulseaudio.
Lee
participants (3)
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Eliot Blennerhassett -
Lee Revell -
Reiner