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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "playbackengine/qffmpegaudiorenderer_p.h"
#include "qaudiosink.h"
#include "qaudiooutput.h"
#include "private/qplatformaudiooutput_p.h"
#include "qffmpegresampler_p.h"
#include "qffmpegmediaformatinfo_p.h"
QT_BEGIN_NAMESPACE
namespace QFFmpeg::PlaybackEngineInternal {
constexpr std::chrono::microseconds audioSinkBufferSize(100000);
AudioRenderer::AudioRenderer(const TimeController &tc, QAudioOutput *output)
: Renderer(tc,
audioSinkBufferSize / 2 /*Ensures kind of "spring" in order to avoid chopy sound*/),
m_output(output)
{
if (output) {
connect(output, &QAudioOutput::deviceChanged, this, &AudioRenderer::onDeviceChanged);
connect(output, &QAudioOutput::volumeChanged, this, &AudioRenderer::updateVolume);
connect(output, &QAudioOutput::mutedChanged, this, &AudioRenderer::updateVolume);
}
}
AudioRenderer::~AudioRenderer()
{
freeOutput();
}
void AudioRenderer::updateVolume()
{
if (m_sink)
m_sink->setVolume(m_output->isMuted() ? 0.f : m_output->volume());
}
void AudioRenderer::onDeviceChanged()
{
m_deviceChanged = true;
}
Renderer::RenderingResult AudioRenderer::renderInternal(Frame frame)
{
if (frame.isValid())
updateOutput(frame.codec());
if (!m_sink || !m_resampler || !m_ioDevice)
return {};
if (!m_bufferedData.isValid()) {
if (!frame.isValid())
return {};
m_bufferedData = m_resampler->resample(frame.avFrame());
m_bufferWritten = 0;
}
if (m_bufferedData.isValid()) {
auto bytesWritten = m_ioDevice->write(m_bufferedData.constData<char>() + m_bufferWritten,
m_bufferedData.byteCount() - m_bufferWritten);
m_bufferWritten += bytesWritten;
if (m_bufferWritten >= m_bufferedData.byteCount()) {
m_bufferedData = {};
m_bufferWritten = 0;
return {};
}
return Renderer::RenderingResult{ std::chrono::microseconds(m_format.durationForBytes(
m_sink->bufferSize() / 2 + m_bufferedData.byteCount() - m_bufferWritten)) };
}
return {};
}
void AudioRenderer::onPlaybackRateChanged()
{
m_resampler.reset();
}
void AudioRenderer::initResempler(const Codec *codec)
{
// We recreate resampler whenever format is changed
/* AVSampleFormat requiredFormat =
QFFmpegMediaFormatInfo::avSampleFormat(m_format.sampleFormat());
#if QT_FFMPEG_OLD_CHANNEL_LAYOUT
qCDebug(qLcAudioRenderer) << "init resampler" << requiredFormat
<< codec->stream()->codecpar->channels;
#else
qCDebug(qLcAudioRenderer) << "init resampler" << requiredFormat
<< codec->stream()->codecpar->ch_layout.nb_channels;
#endif
*/
auto resamplerFormat = m_format;
resamplerFormat.setSampleRate(qRound(m_format.sampleRate() / playbackRate()));
m_resampler = std::make_unique<Resampler>(codec, resamplerFormat);
}
void AudioRenderer::freeOutput()
{
if (m_sink) {
m_sink->stop();
m_sink->reset();
m_sink.reset();
}
m_ioDevice = nullptr;
m_bufferedData = {};
m_bufferWritten = 0;
m_deviceChanged = false;
}
void AudioRenderer::updateOutput(const Codec *codec)
{
if (m_deviceChanged) {
freeOutput();
m_format = {};
m_resampler.reset();
}
if (!m_output) {
return;
}
if (!m_format.isValid()) {
m_format =
QFFmpegMediaFormatInfo::audioFormatFromCodecParameters(codec->stream()->codecpar);
m_format.setChannelConfig(m_output->device().channelConfiguration());
}
if (!m_sink) {
m_sink = std::make_unique<QAudioSink>(m_output->device(), m_format);
updateVolume();
m_sink->setBufferSize(m_format.bytesForDuration(audioSinkBufferSize.count()));
m_ioDevice = m_sink->start();
}
if (!m_resampler) {
initResempler(codec);
}
}
}
QT_END_NAMESPACE
#include "moc_qffmpegaudiorenderer_p.cpp"
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