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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AudioDestinationResampler.h"
#if ENABLE(WEB_AUDIO)
#include "AudioBus.h"
#include "AudioSession.h"
#include "AudioUtilities.h"
#include "Logging.h"
#include "MultiChannelResampler.h"
namespace WebCore {
constexpr size_t fifoSize = 96 * AudioUtilities::renderQuantumSize;
AudioDestinationResampler::AudioDestinationResampler(AudioIOCallback& callback, unsigned numberOfOutputChannels, float inputSampleRate, float outputSampleRate)
: AudioDestination(callback, inputSampleRate)
, m_outputBus(AudioBus::create(numberOfOutputChannels, AudioUtilities::renderQuantumSize, false).releaseNonNull())
, m_renderBus(AudioBus::create(numberOfOutputChannels, AudioUtilities::renderQuantumSize).releaseNonNull())
, m_fifo(numberOfOutputChannels, fifoSize)
{
if (inputSampleRate != outputSampleRate) {
double scaleFactor = static_cast<double>(inputSampleRate) / outputSampleRate;
m_resampler = makeUnique<MultiChannelResampler>(scaleFactor, numberOfOutputChannels, AudioUtilities::renderQuantumSize, [this](AudioBus* bus, size_t framesToProcess) {
ASSERT_UNUSED(framesToProcess, framesToProcess == AudioUtilities::renderQuantumSize);
callRenderCallback(nullptr, bus, AudioUtilities::renderQuantumSize, m_outputTimestamp);
});
}
}
AudioDestinationResampler::~AudioDestinationResampler() = default;
unsigned AudioDestinationResampler::framesPerBuffer() const
{
return m_renderBus->length();
}
void AudioDestinationResampler::start(Function<void(Function<void()>&&)>&& dispatchToRenderThread, CompletionHandler<void(bool)>&& completionHandler)
{
ASSERT(isMainThread());
LOG(Media, "AudioDestinationResampler::start");
{
Locker locker { m_dispatchToRenderThreadLock };
m_dispatchToRenderThread = WTFMove(dispatchToRenderThread);
}
startRendering(WTFMove(completionHandler));
}
void AudioDestinationResampler::stop(CompletionHandler<void(bool)>&& completionHandler)
{
ASSERT(isMainThread());
LOG(Media, "AudioDestinationResampler::stop");
stopRendering(WTFMove(completionHandler));
{
Locker locker { m_dispatchToRenderThreadLock };
m_dispatchToRenderThread = nullptr;
}
}
void AudioDestinationResampler::setIsPlaying(bool isPlaying)
{
ASSERT(isMainThread());
if (m_isPlaying == isPlaying)
return;
m_isPlaying = isPlaying;
{
Locker locker { m_callbackLock };
if (m_callback)
m_callback->isPlayingDidChange();
}
}
size_t AudioDestinationResampler::pullRendered(size_t numberOfFrames)
{
ASSERT(!isMainThread());
numberOfFrames = std::min(numberOfFrames, fifoSize);
Locker locker { m_fifoLock };
return m_fifo.pull(m_outputBus.ptr(), numberOfFrames);
}
bool AudioDestinationResampler::render(double sampleTime, MonotonicTime hostTime, size_t framesToRender)
{
m_outputTimestamp = {
Seconds { sampleTime },
hostTime
};
// When there is a AudioWorklet, we do rendering on the AudioWorkletThread.
if (!m_dispatchToRenderThreadLock.tryLock())
return false;
Locker locker { AdoptLock, m_dispatchToRenderThreadLock };
if (!m_dispatchToRenderThread)
renderOnRenderingThreadIfPlaying(framesToRender);
else {
m_dispatchToRenderThread([protectedThis = Ref { *this }, framesToRender]() mutable {
protectedThis->renderOnRenderingThreadIfPlaying(framesToRender);
});
}
return true;
}
// This runs on the AudioWorkletThread when AudioWorklet is enabled, on the audio device's rendering thread otherwise.
void AudioDestinationResampler::renderOnRenderingThreadIfPlaying(size_t framesToRender)
{
if (!m_isPlaying)
return;
for (size_t pushedFrames = 0; pushedFrames < framesToRender; pushedFrames += AudioUtilities::renderQuantumSize) {
if (m_resampler)
m_resampler->process(m_renderBus.ptr(), AudioUtilities::renderQuantumSize);
else
callRenderCallback(nullptr, m_renderBus.ptr(), AudioUtilities::renderQuantumSize, m_outputTimestamp);
Locker locker { m_fifoLock };
m_fifo.push(m_renderBus.ptr());
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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