Re: [Alsa-devel] Rate Conversion
Jaroslav Kysela wrote: On Thu, 27 Jun 2002, Kris Modrak wrote: I am writing a PCM application and wish to play a .wav file that has a sampling rate of 8kHz on a hardware setup that only supports sampling frequencies of 44.1 or 48kHz. Does anyone know how to implement this? You don't need to do this. Use the 'plughw' device which should do all conversions from you. I am a little confused about your advice. I am not sure how to access the 'plughw' device from my application. I have a full duplex application that can play a file at 44.1kHz and record at the same rate but I want it to operate at lower sampling frequencies. I am not sure of how I should be setting up my PCM devices. How do I tell them to convert, say, 8kHz audio data to 44.1kHz audio data so my hardware can play it at the correct speed? I tried using aplay with plughw to play an 8kHz file and got the following results aplay -Dplughw s1.wav Playing WAVE 's1.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono Segmentation fault However it worked when using a 441.kHz file. Regards Kris Modrak --- This sf.net email is sponsored by:ThinkGeek Bringing you mounds of caffeinated joy. http://thinkgeek.com/sf ___ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
Re: [Alsa-devel] Rate Conversion
Paul Davis wrote: You don't need to do this. Use the 'plughw' device which should do all conversions from you. I am a little confused about your advice. I am not sure how to access the 'plughw' device from my application. snd_pcm_open (handle, plughw:N,M, ...) where N and M are the card number and subdevice number. Preferably, this is a string supplied by the user, not hard coded into the application. I am not sure of how I should be setting up my PCM devices. How do I tell them to convert, say, 8kHz audio data to 44.1kHz audio data so my hardware can play it at the correct speed? just as in the few token API examples. using snd_pcm_hw_params_*(). there is no difference setting the parameters no matter what type of PCM device you are using. If use the virtual plughw:0,0 device and set the rate to 8kHz, at what rate is my actual hardware device set to? Where are these settings made and how are they decided? Do I need to, or is it possible to, tell my soundcard to operate at 44.1kHz? Kris Modrak --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
[Alsa-devel] .asoundrc file
The start of my .asoundrc file is as follows:
pcm.rme9652 {
type hw
card 0
device 0
}
ctl.rme9652 {
type hw
card 0
}
What is the purpose of the ctl.rme9652 declaration? My plugin devices
seem to work without it.
Regards
Kris Modrak
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Re: [Alsa-devel] .asoundrc file
Patrick Shirkey wrote:
Kris Modrak wrote:
The start of my .asoundrc file is as follows:
pcm.rme9652 {
type hw
card 0
device 0
}
ctl.rme9652 {
type hw
card 0
}
What is the purpose of the ctl.rme9652 declaration? My plugin devices
seem to work without it.
It is a configuration for the onboard mixer. Very little is known about
why we use it. Some programs (JACK) won't work without it.
The Hammerfall Light doesn't have a mixer I guess I don't need it?
Regards
Kris Modrak
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[Alsa-devel] RME 9636 lockup
I am writing an application that uses an RME9636 Hammerfall light with the ALSA API. Occasionally (and randomly) the card is left in a locked up state by my application as the next time I run the program the card is unable to signal to the computer when there is capture or playback data to be transferred and doesn't signal xruns. At this point I am unable to use the card with any ALSA applications, aplay etc., until after rebooting the computer. Why might this be happening? Could the program be exiting when the card is temporarily is a state of being locked? I am using threads, could this have something to do with it? And is there any way of resetting the card in software, ie. is there any ALSA API function that does this? I would prefer not to reboot the computer every time that this happens. Thanks Kris Modrak --- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ ___ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
