void AlsaLayer::playback(int maxFrames)
{
unsigned framesToGet = Manager::instance().getMainBuffer().availableForGet(MainBuffer::DEFAULT_ID);
// no audio available, play tone or silence
if (framesToGet <= 0) {
// FIXME: not thread safe! we only lock the mutex when we get the
// pointer, we have no guarantee that it will stay safe to use
AudioLoop *tone = Manager::instance().getTelephoneTone();
AudioLoop *file_tone = Manager::instance().getTelephoneFile();
playbackBuff_.setFormat(audioFormat_);
playbackBuff_.resize(maxFrames);
if (tone)
tone->getNext(playbackBuff_, playbackGain_);
else if (file_tone && !ringtoneHandle_)
file_tone->getNext(playbackBuff_, playbackGain_);
else
playbackBuff_.reset();
playbackBuff_.interleave(playbackIBuff_);
write(playbackIBuff_.data(), playbackBuff_.frames(), playbackHandle_);
} else {
// play the regular sound samples
const AudioFormat mainBufferFormat = Manager::instance().getMainBuffer().getInternalAudioFormat();
const bool resample = audioFormat_.sample_rate != mainBufferFormat.sample_rate;
double resampleFactor = 1.0;
unsigned maxNbFramesToGet = maxFrames;
if (resample) {
resampleFactor = static_cast<double>(audioFormat_.sample_rate) / mainBufferFormat.sample_rate;
maxNbFramesToGet = maxFrames / resampleFactor;
}
framesToGet = std::min(framesToGet, maxNbFramesToGet);
playbackBuff_.setFormat(mainBufferFormat);
playbackBuff_.resize(framesToGet);
Manager::instance().getMainBuffer().getData(playbackBuff_, MainBuffer::DEFAULT_ID);
playbackBuff_.applyGain(isPlaybackMuted_ ? 0.0 : playbackGain_);
if (audioFormat_.nb_channels != mainBufferFormat.nb_channels) {
playbackBuff_.setChannelNum(audioFormat_.nb_channels, true);
}
if (resample) {
const size_t outFrames = framesToGet * resampleFactor;
AudioBuffer rsmpl_out(outFrames, audioFormat_);
resampler_.resample(playbackBuff_, rsmpl_out);
rsmpl_out.interleave(playbackIBuff_);
write(playbackIBuff_.data(), outFrames, playbackHandle_);
} else {
playbackBuff_.interleave(playbackIBuff_);
write(playbackIBuff_.data(), framesToGet, playbackHandle_);
}
}
}
void JackLayer::fillWithToneOrRingtone(AudioBuffer &buffer)
{
buffer.resize(hardwareBufferSize_);
AudioLoop *tone = Manager::instance().getTelephoneTone();
AudioLoop *file_tone = Manager::instance().getTelephoneFile();
// In case of a dtmf, the pointers will be set to nullptr once the dtmf length is
// reached. For this reason we need to fill audio buffer with zeros if pointer is nullptr
if (tone) {
tone->getNext(buffer, playbackGain_);
} else if (file_tone) {
file_tone->getNext(buffer, playbackGain_);
} else {
buffer.reset();
}
}