#include "qtaud.h" #include QtAudioRenderer::QtAudioRenderer() : m_AudioOutput(nullptr), m_OutputDevice(nullptr) { } QtAudioRenderer::~QtAudioRenderer() { delete m_AudioOutput; } bool QtAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATION* opusConfig) { QAudioFormat format; // testAudio() assumes this sample rate Q_ASSERT(opusConfig->sampleRate == 48000); format.setSampleRate(opusConfig->sampleRate); format.setChannelCount(opusConfig->channelCount); format.setSampleSize(16); format.setSampleType(QAudioFormat::SignedInt); format.setCodec("audio/pcm"); m_AudioOutput = new QAudioOutput(format); // Buffer 20 ms of audio data m_AudioOutput->setBufferSize(format.bytesForDuration(20000)); m_OutputDevice = m_AudioOutput->start(); if (m_OutputDevice == nullptr) { qWarning() << "Audio start failed:" << m_AudioOutput->error(); return false; } // Check what buffer size was really used after starting qInfo() << "Audio stream buffer:" << m_AudioOutput->bufferSize() << "bytes"; return true; } void QtAudioRenderer::submitAudio(short* audioBuffer, int audioSize) { m_OutputDevice->write((const char *)audioBuffer, audioSize); } bool QtAudioRenderer::testAudio(int audioConfiguration) { QAudioFormat format; format.setSampleRate(48000); format.setSampleSize(16); format.setSampleType(QAudioFormat::SignedInt); format.setCodec("audio/pcm"); switch (audioConfiguration) { case AUDIO_CONFIGURATION_STEREO: format.setChannelCount(2); break; case AUDIO_CONFIGURATION_51_SURROUND: format.setChannelCount(6); break; default: Q_ASSERT(false); return false; } if (QAudioDeviceInfo::defaultOutputDevice().isFormatSupported(format)) { qInfo() << "Audio test successful with" << format.channelCount() << "channels"; return true; } else { qWarning() << "Audio test failed with" << format.channelCount() << "channels"; return false; } } int QtAudioRenderer::detectAudioConfiguration() { int preferredChannelCount = QAudioDeviceInfo::defaultOutputDevice().preferredFormat().channelCount(); qInfo() << "Audio output device prefers" << preferredChannelCount << "channel configuration"; // We can better downmix 5.1 to quad than we can upmix stereo if (preferredChannelCount > 2) { return AUDIO_CONFIGURATION_51_SURROUND; } else { return AUDIO_CONFIGURATION_STEREO; } }