void Alsa9Buf::SetChunksize( snd_pcm_sframes_t frames )
{
preferred_chunksize = frames;
SetHWParams();
SetSWParams();
}
void Alsa9Buf::SetSampleRate(int hz)
{
samplerate = hz;
samplerate_set_explicitly = true;
if( !SetHWParams() )
{
/*
* If this fails, we're no longer set up; if we call SW param calls,
* ALSA will assert out on us (instead of gracefully returning an error).
*
* If we fail here, it means we set up the initial stream, but can't
* configure it to the sample rate we want. This happened on a CS46xx
* with an old ALSA version, at least: snd_pcm_hw_params failed
* with ENOMEM. It set up only 10 44.1khz streams; it may have been
* trying to increase one to 48khz and, for some reason, that needed
* more card memory. (I've tried to work around that by setting up
* streams as 48khz to begin with, so we set it up as the maximum
* to begin with.)
*/
FAIL_M( ssprintf("SetHWParams(%i) failed", hz) );
}
SetSWParams();
}
Alsa9Buf::Alsa9Buf( hw hardware, int channels_ )
{
GetSoundCardDebugInfo();
InitializeErrorHandler();
channels = channels_;
samplerate = 44100;
samplebits = 16;
last_cursor_pos = 0;
samplerate_set_explicitly = false;
preferred_writeahead = 8192;
preferred_chunksize = 1024;
/* Open the device. */
int err;
err = dsnd_pcm_open( &pcm, DeviceName(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
if (err < 0)
RageException::ThrowNonfatal("dsnd_pcm_open(%s): %s", DeviceName().c_str(), dsnd_strerror(err));
if( !SetHWParams() )
{
CHECKPOINT;
dsnd_pcm_close(pcm);
CHECKPOINT;
RageException::ThrowNonfatal( "SetHWParams failed" );
}
SetSWParams();
}
RString Alsa9Buf::Init( int channels_,
int iWriteahead,
int iChunkSize,
int iSampleRate )
{
channels = channels_;
preferred_writeahead = iWriteahead;
preferred_chunksize = iChunkSize;
if( iSampleRate == 0 )
samplerate = 44100;
else
samplerate = iSampleRate;
GetSoundCardDebugInfo();
InitializeErrorHandler();
/* Open the device. */
int err;
err = dsnd_pcm_open( &pcm, DeviceName(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
if( err < 0 )
return ssprintf( "dsnd_pcm_open(%s): %s", DeviceName().c_str(), dsnd_strerror(err) );
if( !SetHWParams() )
{
CHECKPOINT;
return "SetHWParams failed";
}
SetSWParams();
LOG->Info( "ALSA: Mixing at %ihz", samplerate );
if( preferred_writeahead != writeahead )
LOG->Info( "ALSA: writeahead adjusted from %u to %u", (unsigned) preferred_writeahead, (unsigned) writeahead );
if( preferred_chunksize != chunksize )
LOG->Info( "ALSA: chunksize adjusted from %u to %u", (unsigned) preferred_chunksize, (unsigned) chunksize );
return "";
}
void Alsa9Buf::SetWriteahead( snd_pcm_sframes_t frames )
{
preferred_writeahead = frames;
SetHWParams();
SetSWParams();
}
