itsmattkc
0ac202078c
Previously the audio output manager was a "hybrid device" that acted as a pull device for audio devices and as a push device and device proxy for the rest of the application. This approach turned out to be flawed, particularly in the frequent opening and closing of the audio device (extremely slow). Since we use both pulling (for constant playback) and pushing (audio scrubbing, short bursts of sound), it needed a similar but different approach. This approach will switch the output device from push mode (default) to pull mode (during playback) only when necessary resulting in far less UI lag (basically unnoticeable now) than the previous approach.
148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "audiohybriddevice.h"
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#include <QDebug>
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#include <QtMath>
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#include "audiobufferaverage.h"
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AudioHybridDevice::AudioHybridDevice(QObject *parent) :
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QObject(parent),
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output_(nullptr),
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push_device_(nullptr),
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enable_sending_samples_(false)
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{
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connect(&device_proxy_, &AudioOutputDeviceProxy::ProcessedAverages, this, &AudioHybridDevice::SentSamples);
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}
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bool AudioHybridDevice::OutputIsSet()
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{
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return (output_.get());
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}
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void AudioHybridDevice::Push(const QByteArray& samples)
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{
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// If no output device, nothing to be done
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if (!output_) {
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return;
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}
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// Replace sample buffer with this one
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pushed_samples_ = samples;
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pushed_sample_index_ = 0;
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// If we had another device connected, disconnect it now
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ResetToPushMode();
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// Start pushing samples to the output
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OutputNotified();
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}
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void AudioHybridDevice::ResetToPushMode()
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{
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// If we have a null push device, then we currently have the output in pull mode. We restore it to push mode here.
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if (output_ && !push_device_) {
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output_->stop();
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device_proxy_.close();
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// Put QAudioOutput back into push mode
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push_device_ = output_->start();
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}
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}
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void AudioHybridDevice::PullFromDevice(QIODevice *device)
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{
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if (!output_ || !device) {
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return;
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}
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// Stop any current output and disable push mode
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output_->stop();
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push_device_ = nullptr;
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pushed_samples_.clear();
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// Pull from the device
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device_proxy_.SetDevice(device);
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device_proxy_.open(QIODevice::ReadOnly);
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output_->start(&device_proxy_);
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}
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void AudioHybridDevice::OutputNotified()
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{
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// Check if we're currently in push mode and if we have samples to push
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if (!push_device_ || pushed_samples_.isEmpty()) {
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return;
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}
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const char* read_ptr = pushed_samples_.constData() + pushed_sample_index_;
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// Push the bytes we have to the audio output
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qint64 write_count = push_device_->write(read_ptr,
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pushed_samples_.size() - pushed_sample_index_);
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// Emit the samples we just sent
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ProcessAverages(read_ptr, static_cast<int>(write_count));
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// Increment sample buffer index (faster than shift the bytes up)
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pushed_sample_index_ += static_cast<int>(write_count);
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// If we've pushed all samples, we can clear this array
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if (pushed_sample_index_ == pushed_samples_.size()) {
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pushed_samples_.clear();
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}
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}
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void AudioHybridDevice::SetEnableSendingSamples(bool e)
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{
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enable_sending_samples_ = e;
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device_proxy_.SetSendAverages(e);
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}
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void AudioHybridDevice::SetOutputDevice(QAudioDeviceInfo info, QAudioFormat format)
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{
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// Whatever the output is doing right now, stop it
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if (output_) {
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output_->stop();
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if (device_proxy_.isOpen()) {
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device_proxy_.close();
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}
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}
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// Create a new output device and start it in push mode
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output_ = std::unique_ptr<QAudioOutput>(new QAudioOutput(info, format, this));
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output_->setNotifyInterval(1);
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push_device_ = output_->start();
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connect(output_.get(), &QAudioOutput::notify, this, &AudioHybridDevice::OutputNotified);
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}
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void AudioHybridDevice::ProcessAverages(const char *data, int length)
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{
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if (!enable_sending_samples_ || length == 0) {
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return;
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}
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emit SentSamples(AudioBufferAverage::ProcessAverages(data, length));
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}
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