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/***
Olive - Non-Linear Video Editor
Copyright (C) 2019 Olive Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#include "outputmanager.h"
#include <QDebug>
#include <QtMath>
#include <QFile>
OLIVE_NAMESPACE_ENTER
AudioOutputManager::AudioOutputManager(QObject *parent) :
QObject(parent),
output_(nullptr),
push_device_(nullptr)
{
}
AudioOutputManager::~AudioOutputManager()
{
Close();
}
void AudioOutputManager::Push(const QByteArray& samples)
{
// This function is not queued and is intended to be called from the caller's thread
QMutexLocker lock(&push_sample_lock_);
// Replace sample buffer with this one
push_samples_ = samples;
push_sample_index_ = 0;
// If we had another device connected, disconnect it now
QMetaObject::invokeMethod(this, "ResetToPushMode", Qt::QueuedConnection);
// Start pushing samples to the output
QMetaObject::invokeMethod(this, "PushMoreSamples", Qt::QueuedConnection);
}
void AudioOutputManager::ResetToPushMode()
{
// If we have a null push device, then we currently have the output in pull mode. We restore it to push mode here.
if (output_ && !push_device_) {
output_->stop();
device_proxy_.close();
// Put QAudioOutput back into push mode
push_device_ = output_->start();
}
}
void AudioOutputManager::SetParameters(AudioParams params)
{
device_proxy_.SetParameters(params);
}
void AudioOutputManager::Close()
{
if (output_) {
output_->stop();
if (device_proxy_.isOpen()) {
device_proxy_.close();
}
output_->deleteLater();
output_ = nullptr;
}
}
void AudioOutputManager::PullFromDevice(const QString &filename, qint64 offset, int playback_speed)
{
if (!output_) {
return;
}
// Stop any current output and disable push mode
output_->stop();
push_device_ = nullptr;
push_samples_.clear();
// Pull from the device
device_proxy_.SetDevice(filename, offset, playback_speed);
device_proxy_.open(QIODevice::ReadOnly);
output_->start(&device_proxy_);
}
void AudioOutputManager::PushMoreSamples()
{
QMutexLocker lock(&push_sample_lock_);
// Check if we're currently in push mode and if we have samples to push
if (!push_device_ || push_samples_.isEmpty()) {
return;
}
const char* read_ptr = push_samples_.constData() + push_sample_index_;
// Push the bytes we have to the audio output
qint64 write_count = push_device_->write(read_ptr,
push_samples_.size() - push_sample_index_);
// Increment sample buffer index (faster than shift the bytes up)
push_sample_index_ += static_cast<int>(write_count);
// If we've pushed all samples, we can clear this array
if (push_sample_index_ == push_samples_.size()) {
push_samples_.clear();
}
}
void AudioOutputManager::SetOutputDevice(QAudioDeviceInfo info, QAudioFormat format)
{
// Whatever the output is doing right now, stop it
Close();
// Create a new output device and start it in push mode
output_ = new QAudioOutput(info, format, this);
output_->setBufferSize(131072);
output_->setNotifyInterval(1);
push_device_ = output_->start();
connect(output_, &QAudioOutput::notify, this, &AudioOutputManager::PushMoreSamples);
connect(output_, &QAudioOutput::notify, this, &AudioOutputManager::OutputNotified);
// Un-comment this to get debug information about what the audio output is doing
//connect(output_, &QAudioOutput::stateChanged, this, &AudioOutputManager::OutputStateChanged);
}
void AudioOutputManager::OutputStateChanged(QAudio::State state)
{
qDebug() << state << output_->error();
}
OLIVE_NAMESPACE_EXIT
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