static NoteDevice *
pcmConstruct (int errorLevel) {
NoteDevice *device;
if ((device = malloc(sizeof(*device)))) {
if ((device->pcm = openPcmDevice(errorLevel, opt_pcmDevice))) {
device->blockSize = getPcmBlockSize(device->pcm);
device->sampleRate = getPcmSampleRate(device->pcm);
device->channelCount = getPcmChannelCount(device->pcm);
device->amplitudeFormat = getPcmAmplitudeFormat(device->pcm);
device->blockUsed = 0;
if ((device->blockAddress = malloc(device->blockSize))) {
logMessage(LOG_DEBUG, "PCM enabled: blk=%d rate=%d chan=%d fmt=%d",
device->blockSize, device->sampleRate, device->channelCount, device->amplitudeFormat);
return device;
} else {
logMallocError();
}
closePcmDevice(device->pcm);
}
free(device);
} else {
logMallocError();
}
logMessage(LOG_DEBUG, "PCM not available");
return NULL;
}
int
setPcmChannelCount (PcmDevice *pcm, int channels) {
WAVEFORMATEX format = pcm->format;
format.nChannels = channels;
if (!updateWaveOutFormat(pcm, &format, "setting PCM channel count"))
return getPcmChannelCount(pcm);
else
return channels;
}
int
setPcmChannelCount (PcmDevice *pcm, int channels) {
int result;
pcm->channelCount = channels;
if ((result = pcmAlsa_pcm_hw_params_set_channels_near(pcm->handle, pcm->hardwareParameters, &pcm->channelCount)) < 0) {
logPcmError(LOG_ERR, "set channels near", result);
}
return getPcmChannelCount(pcm);
}
int
setPcmChannelCount (PcmDevice *pcm, int channels) {
if (ioctl(pcm->fileDescriptor, SNDCTL_DSP_CHANNELS, &channels) != -1) pcm->channelCount = channels;
return getPcmChannelCount(pcm);
}
int
setPcmChannelCount (PcmDevice *pcm, int channels) {
pcm->parameters.format.voices = channels;
reconfigurePcmChannel(pcm, LOG_WARNING);
return getPcmChannelCount(pcm);
}
int
setPcmChannelCount (PcmDevice *pcm, int channels) {
return getPcmChannelCount(pcm);
}
static int
getPcmFrameSize (PcmDevice *pcm) {
return getPcmChannelCount(pcm) * (pcmAlsa_pcm_hw_params_get_sbits(pcm->hardwareParameters) / 8);
}
