bool AudioDevOSS::uninit()
{
QMutexLocker mutexLockeer(&this->m_mutex);
this->m_deviceFile.close();
this->m_curCaps = AkAudioCaps();
return true;
}
void AudioDeviceElement::resetCaps()
{
this->m_mutexLib.lock();
auto preferredFormat = this->m_audioDevice->preferredFormat(this->m_device);
this->m_mutexLib.unlock();
auto audioCaps = this->m_device == DUMMY_OUTPUT_DEVICE?
AkAudioCaps("audio/x-raw,"
"format=s16,"
"bps=2,"
"channels=2,"
"rate=44100,"
"layout=stereo,"
"align=false"):
preferredFormat;
this->setCaps(audioCaps.toCaps());
}
void AudioDeviceElement::setDevice(const QString &device)
{
if (this->m_device == device)
return;
this->m_device = device;
emit this->deviceChanged(device);
this->m_mutexLib.lock();
auto preferredFormat = this->m_audioDevice->preferredFormat(device);
this->m_mutexLib.unlock();
AkAudioCaps audioCaps = device == DUMMY_OUTPUT_DEVICE?
AkAudioCaps("audio/x-raw,"
"format=s16,"
"bps=2,"
"channels=2,"
"rate=44100,"
"layout=stereo,"
"align=false"):
preferredFormat;
this->setCaps(audioCaps.toCaps());
}
AkAudioCaps AudioDevOSS::deviceCaps(const QString &device, int *fragmentSize) const
{
QFile pcmFile(QString(device)
.remove(QRegExp(":Input$|:Output$")));
if (!pcmFile.open(device.endsWith(":Input")?
QIODevice::ReadOnly: QIODevice::WriteOnly))
return AkAudioCaps();
int formats = AFMT_QUERY;
if (ioctl(pcmFile.handle(), SNDCTL_DSP_GETFMTS, &formats) < 0)
goto deviceCaps_fail;
static const QVector<int> preferredFormats = {
AFMT_S16_NE,
AFMT_S16_LE,
AFMT_S16_BE,
AFMT_U16_LE,
AFMT_U16_BE,
AFMT_S8,
AFMT_U8
};
int format;
format = AFMT_QUERY;
for (const auto &fmt: preferredFormats)
if (formats & fmt) {
format = fmt;
break;
}
if (format == AFMT_QUERY)
goto deviceCaps_fail;
if (ioctl(pcmFile.handle(), SNDCTL_DSP_SETFMT, &format) < 0)
goto deviceCaps_fail;
int stereo;
stereo = 1;
if (ioctl(pcmFile.handle(), SNDCTL_DSP_STEREO, &stereo) < 0)
goto deviceCaps_fail;
static const QVector<int> preferredSampleRates {
48000,
44100,
22050,
11025,
8000
};
int sampleRate;
sampleRate = 0;
for (int rate: preferredSampleRates)
if (ioctl(pcmFile.handle(), SNDCTL_DSP_SPEED, &rate) >= 0){
sampleRate = rate;
break;
}
if (sampleRate < 1)
goto deviceCaps_fail;
int channels;
channels = stereo? 2: 1;
AkAudioCaps::SampleFormat sampleFormat;
sampleFormat = sampleFormats->key(format,
AkAudioCaps::SampleFormat_none);
if (fragmentSize
&& device.endsWith(":Output")) {
// Set the buffer to a maximum of 1024 samples.
int bufferSize;
bufferSize = BUFFER_SIZE
* channels
* AkAudioCaps::bitsPerSample(sampleFormat)
/ 8;
// Let's try setting the fragmet to just 2 pieces, and the half of the
// buffer size, for low latency.
int fragment;
fragment = (2 << 16) | (bufferSize / 2);
ioctl(pcmFile.handle(), SNDCTL_DSP_SETFRAGMENT, &fragment);
// Let's see what OSS did actually set,
audio_buf_info info;
ioctl(pcmFile.handle(), SNDCTL_DSP_GETOSPACE, &info);
*fragmentSize = info.fragsize > 0?
((bufferSize / info.fragsize) << 16) | info.fragsize:
0;
}
pcmFile.close();
{
AkAudioCaps audioCaps;
audioCaps.isValid() = true;
audioCaps.format() = sampleFormat;
audioCaps.bps() = AkAudioCaps::bitsPerSample(audioCaps.format());
audioCaps.channels() = channels;
audioCaps.rate() = int(sampleRate);
audioCaps.layout() = AkAudioCaps::defaultChannelLayout(audioCaps.channels());
audioCaps.align() = false;
return audioCaps;
}
deviceCaps_fail:
pcmFile.close();
return AkAudioCaps();
}
