Sound Card + Intel Galileo + Alsa + confusing documentation

[julian403]

Hello, I want to read sound card's ADC and generate a matrix with that samples. Then compare the matrix to detected pratons, etc.

But I never used an audio's API. The Yocto has intalled Alsa so I decided to use it but looking the Alsa's documentation for asoundlib.h is confusing for me.

Do you have same tutorial for asoundlib.h?

 

[andre_luis]

I also never used this library, but sometimes we have to take examples to beter illustrate the usage. Have you seen this page ?

https://users.suse.com/~mana/alsa090_howto.html#sect03

 

[julian403]

Yes I saw that. But if you see the picture.





I included asoundlib.h and the sentence

snd_pcm_t *handle;

it's right. but there is an undefined reference to snd_pcm_open()

rc = snd_pcm_open(&handle, "default",
SND_PCM_STREAM_PLAYBACK, 0);

What can it be?

 

[andre_luis]

Did you make a search in all project files to seek where the parameter SND_PCM_STREAM_PLAYBACK is defined ?
Perhaps the corresponding .h file wasn't yet included in the header of the current file.