[alsa-devel] How to mix two PCM channels with ALSA
Dear Alsa developers:
I'm trying to write a simple application for mixing two PCM sound channels in C++. Could anyone provide me a quick example about how to implement this operation?
Thank you in advance. Itx
itxEpsilon wrote:
I'm trying to write a simple application for mixing two PCM sound channels in C++. Could anyone provide me a quick example about how to implement this operation?
outputSample[i] = inputChannel1[i] + inputChannel2[i];
What does this have to do with ALSA?
Regards, Clemens
Clemens Ladisch <clemens <at> ladisch.de> writes:
itxEpsilon wrote:
I'm trying to write a simple application for mixing two PCM sound channels in C++. Could anyone provide me a quick example about how to implement this operation?
outputSample[i] = inputChannel1[i] + inputChannel2[i];
What does this have to do with ALSA?
Regards, Clemens
Hi, That's no my question, I'd like to know how is performed with the ALSA API.
i.e.
playSound(buffer1); playSound(buffer2);
is it implicitly mixed when playing two buffers by hardware?
Thanks. Carlos.
itxEpsilon wrote:
I'd like to know how is performed with the ALSA API.
playSound(buffer1); playSound(buffer2);
is it implicitly mixed when playing two buffers by hardware?
Yes, if the hardware actually support this (nowadays, none does), or if ALSA is configured to use software mixing through dmix or PulseAudio (which are enabled by default in most distributions).
Regards, Clemens
participants (2)
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Clemens Ladisch -
itxEpsilon