alsa

I am playing a single channel audio in non-interleaved mode. I am getting underrun when I am writing audio data into speaker : ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred Here is how I write: printf("%d",snd_pcm_avail (spkhandle)); ret = snd_pcm_writen(spkhandle, pSpeakerBuf , framesIn18Millisec); if(ret < 0) { snd_pcm_recover(spkhandle, ret, 0); } What are the different ways/parameter configurations to prevent ALSA under run ? (I am using Linux 3.0, ARM ) Edit: Here is a buffer measurement using snd_pcm_avail() API snd_pcm_avail = 2304 << snd_pcm_writen call 1 success snd_pcm

In gnuradio-companion I'm using the audio source block as my input signal for the next blocks. All works almost fine. The only little problem is that I'm getting the signal from my microphone (this is the normal behavior off course). I would rather like to get the audio signal being played directly without having to go through my speakers, the air from my room and the microphone. All this generates signal losses and adds noise. I know there is the file source block but this isn't a real solution for me. I also know I could just plug a mini-jack cable from the output to the input from my sound

Since I've posted this question , I've been trying to write a valid WAV file myself from raw PCM data. I've managed to write the FLAC converter (tested and works), but it does not encode the WAV files I've been writing. I'm not sure what I'm doing wrong. I've been scouring the internet looking at other individuals source code and comparing it to my own, but I still can't get it to work. Here is the whittled down source code (sorry it's still a bit long, it takes a bit of code to record to a .wav on my own): // Compile with "g++ test.ccp -o test -lasound" // Use the newer ALSA API #define ALSA

How do I mute sound using C? Is there an ALSA function call? Are there any other function calls/APIs that can MUTE the microphone? I have written some code to do audio playback using ALSA, and I have noticed a DELAY before the sound starts playing ... how do I reduce DELAY or LATENCY on sound playback? x user1055604 #include <alsa/asoundlib.h> void SetAlsaMasterMute() { long min, max; snd_mixer_t *handle; snd_mixer_selem_id_t *sid; const char *card = "default"; const char *selem_name = "Master"; snd_mixer_open(&handle, 0); snd_mixer_attach(handle, card); snd_mixer_selem_register(handle, NULL,