Re: [Alsa-user] variable input to ALSA via .asoundrc + shell variable
Dmitri Seletski wrote: It came to my attention, that I can start process and pass some variable to ALSA upon execution, so it may change PCM for example. I took information from here: http://blog.vrplumber.com/b/2012/03/23/control-default-alsa-device/ I tried it and it worked. However, it didn't work as expected for me. I was able to see rate is changing if I used various PCM with variable. So this part worked. I was able to check with /proc/asound/card0/pcm0p/sub0/hw_params file, it showed correct rate when I was using different PCM's. However, it seems that something happened to dmix, Some processes failed with device busy message, devices, who used default rate settings, to which I did not change rate with shell variable. This is probably because those processes ignore the default device and got directly to some hw device. My question, is, is there any user documentation to those three lines: @func getenv vars [ DISPLAY_ALSA_DEVICE ] default front Not really. I want to know if function in question can be used in non !default device? Yes. Regards, Clemens -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] variable input to ALSA via .asoundrc + shell variable
On Mon, 23 Mar 2015 09:06:01 +0100 Clemens Ladisch cladi...@googlemail.com wrote: Dmitri Seletski wrote: It came to my attention, that I can start process and pass some variable to ALSA upon execution, so it may change PCM for example. I took information from here: http://blog.vrplumber.com/b/2012/03/23/control-default-alsa-device/ I tried it and it worked. However, it didn't work as expected for me. I was able to see rate is changing if I used various PCM with variable. So this part worked. I was able to check with /proc/asound/card0/pcm0p/sub0/hw_params file, it showed correct rate when I was using different PCM's. However, it seems that something happened to dmix, Some processes failed with device busy message, devices, who used default rate settings, to which I did not change rate with shell variable. This is probably because those processes ignore the default device and got directly to some hw device. My question, is, is there any user documentation to those three lines: @func getenv vars [ DISPLAY_ALSA_DEVICE ] default front Not really. I want to know if function in question can be used in non !default device? Yes. Regards, Clemens Thanks! -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
[Alsa-user] variable input to ALSA via .asoundrc + shell variable
Hello. It came to my attention, that I can start process and pass some variable to ALSA upon execution, so it may change PCM for example. I took information from here: http://blog.vrplumber.com/b/2012/03/23/control-default-alsa-device/ I tried it and it worked. However, it didn't work as expected for me. I was able to see rate is changing if I used various PCM with variable. So this part worked. I was able to check with /proc/asound/card0/pcm0p/sub0/hw_params file, it showed correct rate when I was using different PCM's. However, it seems that something happened to dmix, Some processes failed with device busy message, devices, who used default rate settings, to which I did not change rate with shell variable. My question, is, is there any user documentation to those three lines: @func getenv vars [ DISPLAY_ALSA_DEVICE ] default front I get that default tells !default PCM to use front in case shell variable DISPLAY_ALSA_DEVICE is empty or doesn't correspond to existin PCM. I need to know, @func getenv, how it works. I want to know if function in question can be used in non !default device? My testing showed, that it's not, but may be I am not doing something right. In other words, if shell variable can be read by different PCm than !default? I have read ALSA programmer's documentation on this function,but words are so generic, that I(no programmer) didn't understand them. Thanks in advance Dmitri Seletski -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
