We're having a problem with some of our audio applications. When a song starts playing we will often hear a loud pop out of the speakers before it plays audio. It seems dependent upon where we stoped and the specfic content of the last song, if we hit our "stop control" and abort in the middle of the song it may pop uppon restarting or starting a new song.
One of our engrs found if he fills the entire buffer with zeros before quitting the program, on the next start it won't pop (though that moves the pop to the end of the previous due to a disconnect/jump in the created waveform). Unless this is a hardware issue, this doesn't seem to be the right solution to me. So:
* What are things that we can do in our program using the alsa pcm functions to eliminate this? Maybe a specific function we need to call or a particular sequence?
* Or, is this something inherent in hardware and other than filling with zeros before we quit there's nothing we can do?
I figure some of you have encountered this before, so maybe there's some ideas out there?
If you're wondering what we do when a "stop" command comes in: pretty much nothing. Basically my "ALSASender" routine ends and calls:
void CDSP::ClosePCM( void )
{
// some other bookkeeping goes here <snip>
snd_pcm_close( hPCM );
if( mPCMStatus )
{
snd_pcm_status_free( mPCMStatus );
mPCMStatus = NULL;
}// Non-alsa related cleanup goes here <snip> }
Also, note that we do get the same pops with using aplay.
Thanks, - Steve
PS Takashi -> I haven't given up on my serial driver patch, I was working on it when I got interupted with something else, it should be on its way soon; thanks for your help.
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