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/*
* Copyright (C) 2020 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 "SpeechRecognitionCaptureSourceImpl.h"
#if ENABLE(MEDIA_STREAM)
#include "SpeechRecognitionUpdate.h"
#include <wtf/CryptographicallyRandomNumber.h>
#if PLATFORM(COCOA)
#include "CAAudioStreamDescription.h"
#include "WebAudioBufferList.h"
#endif
namespace WebCore {
#if !RELEASE_LOG_DISABLED
static const void* nextLogIdentifier()
{
static uint64_t logIdentifier = cryptographicallyRandomNumber<uint32_t>();
return reinterpret_cast<const void*>(++logIdentifier);
}
static RefPtr<Logger>& nullLogger()
{
static NeverDestroyed<RefPtr<Logger>> logger;
return logger;
}
#endif
SpeechRecognitionCaptureSourceImpl::SpeechRecognitionCaptureSourceImpl(SpeechRecognitionConnectionClientIdentifier identifier, DataCallback&& dataCallback, StateUpdateCallback&& stateUpdateCallback, Ref<RealtimeMediaSource>&& source)
: m_clientIdentifier(identifier)
, m_dataCallback(WTFMove(dataCallback))
, m_stateUpdateCallback(WTFMove(stateUpdateCallback))
, m_source(WTFMove(source))
{
#if !RELEASE_LOG_DISABLED
if (!nullLogger().get()) {
nullLogger() = Logger::create(this);
nullLogger()->setEnabled(this, false);
}
m_source->setLogger(*nullLogger(), nextLogIdentifier());
#endif
m_source->addAudioSampleObserver(*this);
m_source->addObserver(*this);
m_source->start();
initializeWeakPtrFactory();
}
SpeechRecognitionCaptureSourceImpl::~SpeechRecognitionCaptureSourceImpl()
{
m_source->removeAudioSampleObserver(*this);
m_source->removeObserver(*this);
m_source->stop();
}
#if PLATFORM(COCOA)
void SpeechRecognitionCaptureSourceImpl::pullSamplesAndCallDataCallback(AudioSampleDataSource* dataSource, const MediaTime& time, const CAAudioStreamDescription& audioDescription, size_t sampleCount)
{
ASSERT(isMainThread());
auto data = WebAudioBufferList { audioDescription, sampleCount };
{
Locker locker { m_dataSourceLock };
if (m_dataSource.get() != dataSource)
return;
m_dataSource->pullSamples(*data.list(), sampleCount, time.timeValue(), 0, AudioSampleDataSource::Copy);
}
m_dataCallback(time, data, audioDescription, sampleCount);
}
#endif
void SpeechRecognitionCaptureSourceImpl::audioSamplesAvailable(const WTF::MediaTime& time, const PlatformAudioData& data, const AudioStreamDescription& description, size_t sampleCount)
{
if (isMainThread())
return m_dataCallback(time, data, description, sampleCount);
#if PLATFORM(COCOA)
// Heap allocations are forbidden on the audio thread for performance reasons so we need to
// explicitly allow the following allocation(s).
DisableMallocRestrictionsForCurrentThreadScope scope;
ASSERT(description.platformDescription().type == PlatformDescription::CAAudioStreamBasicType);
// Use tryLock() to avoid contention in the real-time audio thread.
if (!m_dataSourceLock.tryLock())
return;
Locker locker { AdoptLock, m_dataSourceLock };
auto audioDescription = toCAAudioStreamDescription(description);
if (!m_dataSource || !m_dataSource->inputDescription() || *m_dataSource->inputDescription() != description) {
auto dataSource = AudioSampleDataSource::create(audioDescription.sampleRate(), m_source.get());
if (dataSource->setInputFormat(audioDescription)) {
callOnMainThread([this, weakThis = WeakPtr { *this }] {
if (!weakThis)
return;
m_stateUpdateCallback(SpeechRecognitionUpdate::createError(m_clientIdentifier, SpeechRecognitionError { SpeechRecognitionErrorType::AudioCapture, "Unable to set input format"_s }));
});
return;
}
if (dataSource->setOutputFormat(audioDescription)) {
callOnMainThread([this, weakThis = WeakPtr { *this }] {
if (!weakThis)
return;
m_stateUpdateCallback(SpeechRecognitionUpdate::createError(m_clientIdentifier, SpeechRecognitionError { SpeechRecognitionErrorType::AudioCapture, "Unable to set output format"_s }));
});
return;
}
m_dataSource = WTFMove(dataSource);
}
m_dataSource->pushSamples(time, data, sampleCount);
callOnMainThread([this, weakThis = WeakPtr { *this }, dataSource = m_dataSource, time, audioDescription, sampleCount] {
if (!weakThis)
return;
pullSamplesAndCallDataCallback(dataSource.get(), time, audioDescription, sampleCount);
});
#endif
}
void SpeechRecognitionCaptureSourceImpl::sourceStarted()
{
ASSERT(isMainThread());
m_stateUpdateCallback(SpeechRecognitionUpdate::create(m_clientIdentifier, SpeechRecognitionUpdateType::AudioStart));
}
void SpeechRecognitionCaptureSourceImpl::sourceStopped()
{
ASSERT(isMainThread());
ASSERT(m_source->captureDidFail());
m_stateUpdateCallback(SpeechRecognitionUpdate::createError(m_clientIdentifier, SpeechRecognitionError { SpeechRecognitionErrorType::AudioCapture, "Source is stopped"_s }));
}
void SpeechRecognitionCaptureSourceImpl::sourceMutedChanged()
{
ASSERT(isMainThread());
m_stateUpdateCallback(SpeechRecognitionUpdate::createError(m_clientIdentifier, SpeechRecognitionError { SpeechRecognitionErrorType::AudioCapture, "Source is muted"_s }));
}
void SpeechRecognitionCaptureSourceImpl::mute()
{
m_source->setMuted(true);
}
} // namespace WebCore
#endif
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