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/*
* Copyright (C) 2018 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. ``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
* 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 "MediaStreamAudioSource.h"
#if ENABLE(MEDIA_STREAM)
#include "AudioBus.h"
#include "AudioUtilities.h"
#include "CAAudioStreamDescription.h"
#include "Logging.h"
#include "WebAudioBufferList.h"
#include <CoreAudio/CoreAudioTypes.h>
#include <pal/avfoundation/MediaTimeAVFoundation.h>
#include <pal/cf/CoreAudioExtras.h>
#include <wtf/StdLibExtras.h>
#include <pal/cf/CoreMediaSoftLink.h>
#include "CoreVideoSoftLink.h"
namespace WebCore {
static inline CAAudioStreamDescription streamDescription(size_t sampleRate, size_t channelCount)
{
bool isFloat = true;
bool isBigEndian = false;
bool isNonInterleaved = true;
static const size_t sampleSize = 8 * sizeof(float);
AudioStreamBasicDescription streamFormat;
FillOutASBDForLPCM(streamFormat, sampleRate, channelCount, sampleSize, sampleSize, isFloat, isBigEndian, isNonInterleaved);
return streamFormat;
}
static inline void copyChannelData(AudioChannel& channel, AudioBuffer& buffer, size_t numberOfFrames, bool isMuted)
{
RELEASE_ASSERT(buffer.mDataByteSize <= numberOfFrames * sizeof(float), "copyChannelData() given an AudioBuffer with insufficient size");
buffer.mNumberChannels = 1;
if (isMuted) {
zeroSpan(mutableSpan<uint8_t>(buffer));
return;
}
auto destination = mutableSpan<uint8_t>(buffer);
auto source = asByteSpan(channel.span());
ASSERT(destination.size() >= source.size(), "copyChannelData() given a larger source than destination");
memcpySpan(destination, source.first(buffer.mDataByteSize));
if (destination.size() > source.size())
zeroSpan(destination.last(destination.size() - source.size()));
}
void MediaStreamAudioSource::setNumberOfChannels(unsigned numberOfChannels)
{
if (numberOfChannels != 1 && numberOfChannels != 2) {
RELEASE_LOG_ERROR(Media, "MediaStreamAudioSource::setNumberOfChannels(%p) trying to configure source with %u channels", this, numberOfChannels);
m_audioBuffer = nullptr;
return;
}
if (auto* audioBuffer = downcast<WebAudioBufferList>(m_audioBuffer.get()); audioBuffer && audioBuffer->channelCount() == numberOfChannels)
return;
auto description = streamDescription(m_currentSettings.sampleRate(), numberOfChannels);
auto numberOfFrames = AudioUtilities::renderQuantumSize;
// Heap allocations are forbidden on the audio thread for performance reasons so we need to
// explicitly allow the following allocation(s).
DisableMallocRestrictionsForCurrentThreadScope disableMallocRestrictions;
m_audioBuffer = makeUnique<WebAudioBufferList>(description, numberOfFrames);
}
void MediaStreamAudioSource::consumeAudio(AudioBus& bus, size_t numberOfFrames)
{
CMTime startTime = PAL::CMTimeMake(m_numberOfFrames, m_currentSettings.sampleRate());
auto mediaTime = PAL::toMediaTime(startTime);
m_numberOfFrames += numberOfFrames;
auto* audioBuffer = m_audioBuffer ? &downcast<WebAudioBufferList>(*m_audioBuffer) : nullptr;
if (!audioBuffer || audioBuffer->bufferCount() != bus.numberOfChannels()) {
ASSERT_NOT_REACHED("MediaStreamAudioSource::consumeAudio without being initialized with a valid number of channels");
return;
}
audioBuffer->setSampleCount(numberOfFrames);
for (size_t cptr = 0; cptr < bus.numberOfChannels(); ++cptr)
copyChannelData(*bus.channel(cptr), *audioBuffer->buffer(cptr), numberOfFrames, muted());
auto description = streamDescription(m_currentSettings.sampleRate(), bus.numberOfChannels());
audioSamplesAvailable(mediaTime, *m_audioBuffer, description, numberOfFrames);
}
} // namespace WebCore
#endif // ENABLE(MEDIA_STREAM)
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