At Thu, 30 Mar 2006 16:23:45 +0200, Sergei Steshenko wrote: > > On Thu, 30 Mar 2006 16:06:10 +0200 > Takashi Iwai <[EMAIL PROTECTED]> wrote: > > > At Mon, 27 Mar 2006 19:59:22 +0200, > > Clemens Ladisch wrote: > > > > > > Sergei Steshenko wrote: > > > > Clemens Ladisch <[EMAIL PROTECTED]> wrote: > > > > > ALSA's rate plugin currently is limited to linear interpolation, > > > > > too, so you would have to add a better resampler to it. > > > > > > > > Can't you guys (ALSA developers, I mean) define an API for resampling ? > > > > > > I think it would be easier (faster) to just add another resampler to > > > pcm_rate.c than to design and implement such an API. > > > > > > However, fell free to submit a patch that does it in whatever way you > > > like. (Then you wouldn't have to wait until I have enough time to get to > > > the resampler entry of my ToDo list. :-) > > > > Well, I've had such one on my local tree for testing purpose, but not > > released publicly. A rate-converter SDK and an external plugin using > > libsamplerate. > > > > Looks like we have enough demands on it. OK, I'll clean it up and > > commit to CVS soon later (currently sourceforge is again refusing > > connections...) > > > > > > Takashi > > > > Thanks - this seems like a very logical solution/decision to me. > > ... > > I was thinking about somewhat wider issue - "connection" of audion > applications to ALSA sound system. > > I haven't yet used dmix, but I think the proper architecture should be: > > |------| > audio_application_1----->---rate_converter_if_needed---->| dmix | > audio_application_2----->---rate_converter_if_needed---->| | > ... | > |--->card_driver > audio_application_N----->---rate_converter_if_needed---->| | > |------| > . > > I.e. ALSA configuration should allow multiple instances of the rate converter > - an instance per audio source.
Actually, if you use "plug" plugin over dmix, the rate converter is enabled on demand. It's the behavior of "default" PCM definition. My patch allows user to select the converter type for each plugin definition, and also a global definition of the converter type used as default. It should suffice most requirements, I guess. Takashi ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
