MockAudioDestinationCocoa.cpp   [plain text]

/*
 * Copyright (C) 2019 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    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
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "config.h"
#include "MockAudioDestinationCocoa.h"

#if ENABLE(WEB_AUDIO)

#include "CAAudioStreamDescription.h"
#include "WebAudioBufferList.h"
#include <wtf/threads/BinarySemaphore.h>

namespace WebCore {

const int kRenderBufferSize = 128;

MockAudioDestinationCocoa::MockAudioDestinationCocoa(AudioIOCallback& callback, float sampleRate)
    : AudioDestinationCocoa(callback, sampleRate)
    , m_workQueue(WorkQueue::create("MockAudioDestinationCocoa Render Queue"))
    , m_timer(RunLoop::current(), this, &MockAudioDestinationCocoa::tick)
{
}

MockAudioDestinationCocoa::~MockAudioDestinationCocoa() = default;

void MockAudioDestinationCocoa::start()
{
    m_timer.startRepeating(Seconds { m_numberOfFramesToProcess / sampleRate() });
    setIsPlaying(true);
}

void MockAudioDestinationCocoa::stop()
{
    m_timer.stop();
    setIsPlaying(false);

    BinarySemaphore semaphore;
    m_workQueue->dispatch([&semaphore] {
        semaphore.signal();
    });
    semaphore.wait();
}

void MockAudioDestinationCocoa::tick()
{
    m_workQueue->dispatch([this, sampleRate = sampleRate(), numberOfFramesToProcess = m_numberOfFramesToProcess] {
        AudioStreamBasicDescription streamFormat;
        setAudioStreamBasicDescription(streamFormat, sampleRate);

        WebAudioBufferList webAudioBufferList { streamFormat, numberOfFramesToProcess };
        AudioDestinationCocoa::inputProc(this, 0, 0, 0, numberOfFramesToProcess, webAudioBufferList.list());
    });
}

} // namespace WebCore

#endif // ENABLE(WEB_AUDIO)