From: Clemens Ladisch <clemens@ladisch.de>
To: Luca Longhi <lucavermei@gmail.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: Create a stereo sound with alsa
Date: Sat, 28 Jul 2012 11:36:08 +0200 [thread overview]
Message-ID: <5013B288.7030304@ladisch.de> (raw)
In-Reply-To: <CAAiKgkvXysxM4q5kharx+BNS66_bQKAToByws46f53U0SoF59g@mail.gmail.com>
Luca Longhi wrote:
> Hi. I've written a code to play two different sine wave (same amplitude and
> f1=440Hz f2=600Hz) one on the left channel and the other on the right
> channel. It seems to be working. I've tried doing the same thing using two
> different sounds file (stereo) but the result is wrong.
> err=snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE); //16bit per campione=2byte per campione
> ...
> char * buffer1;
> char * buffer2;
> char * risultato;
> ...
> {v1=buffer1[j1];}
> {v2=buffer2[j2];}
> risultato[i++]=v1;
> risultato[i++]=v2;
The device expects 16-bit samples, but you write 8-bit values.
Regards,
Clemens
prev parent reply other threads:[~2012-07-28 9:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-28 8:26 Create a stereo sound with alsa Luca Longhi
2012-07-28 9:36 ` Clemens Ladisch [this message]
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