static int
openSoundDevice (void) {
if (!pcm) {
if (!(pcm = openPcmDevice(LOG_WARNING, opt_pcmDevice))) return 0;
speechParameters.nChannels = setPcmChannelCount(pcm, 1);
speechParameters.nSampleFreq = setPcmSampleRate(pcm, 22050);
{
typedef struct {
PcmAmplitudeFormat internal;
int external;
} FormatEntry;
static const FormatEntry formatTable[] = {
{PCM_FMT_S16L , 16},
{PCM_FMT_U8 , 8},
{PCM_FMT_UNKNOWN, 0}
};
const FormatEntry *format = formatTable;
while (format->internal != PCM_FMT_UNKNOWN) {
if (setPcmAmplitudeFormat(pcm, format->internal) == format->internal) break;
++format;
}
if (format->internal == PCM_FMT_UNKNOWN) {
logMessage(LOG_WARNING, "No supported sound format.");
closePcmDevice(pcm);
pcm = NULL;
return 0;
}
speechParameters.nBits = format->external;
}
logMessage(LOG_DEBUG, "Mikropuhe audio configuration: channels=%d rate=%d bits=%d",
speechParameters.nChannels, speechParameters.nSampleFreq, speechParameters.nBits);
}
return 1;
}
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;
}
static void
closeSoundDevice (void) {
if (pcm) {
closePcmDevice(pcm);
pcm = NULL;
}
}
static void
pcmDestruct (NoteDevice *device) {
flushBlock(device);
free(device->blockAddress);
closePcmDevice(device->pcm);
free(device);
logMessage(LOG_DEBUG, "PCM disabled");
}
