[alsa-devel] Query about Playback device name

[Irfan Shaikh]

Hello Clemens,


#################################################################################################################################

I get following error on console if i use  plug:mcasp3  instead  plughw:0,0
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM mcasp3

/********************************************************/
     //alsaParams->playback_device = strdup("plughw:0,0");    /*commented*/
     alsaParams->playback_device = strdup("plug:mcasp3");
     snd_pcm_hw_params_alloca(&alsaParams->hwparams_playback);
     /*Open PCM Playback device*/
     if (snd_pcm_open(&alsaParams->playback_handle,   alsaParams->playback_device,  alsaParams->stream,    alsaParams->device_mode) < 0)
     {
        printf("Error opening PCM device %s\n", alsaParams->playback_device);
        return NULL;
     }

/********************************************************/

# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: EVM [TI81XX EVM], device 0: McASP3 bdrsecodec-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: EVM [TI81XX EVM], device 1: McASP4 bdrsecodec-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

#################################################################################################################################

Regards
Irfan


________________________________________
From: Clemens Ladisch [clemens at ladisch.de]
Sent: Wednesday, March 09, 2011 5:15 PM
To: Irfan Shaikh
Cc: alsa-devel at alsa-project.org
Subject: Re: [alsa-devel] Query about Playback device name

Irfan Shaikh wrote:
> aplay uses following device
> "aplay -Dplug:mcasp3 411.2Kbps-44.1Khz-16bits-2CH-PCM.wav"
>
> I want to use same device i.e "plug:mcasp3" in my plaback application
>
> Can i use following section of code to use "plug:mcasp3" as playback device?
>
>     alsaParams->playback_device = strdup("plug:mcasp3");
>     if (snd_pcm_open(&alsaParams->playback_handle,
>                      alsaParams->playback_device,

Yes.

> SASKEN BUSINESS DISCLAIMER:

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Regards,
Clemens