Source/WebKit/WebProcess/GPU/media/RemoteAudioDestinationProxy.cpp

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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#include "config.h"
#include "RemoteAudioDestinationProxy.h"

#if ENABLE(GPU_PROCESS) && ENABLE(WEB_AUDIO)

#include "GPUConnectionToWebProcess.h"
#include "GPUProcessConnection.h"
#include "RemoteAudioDestinationManager.h"
#include "RemoteAudioDestinationManagerMessages.h"
#include "RemoteAudioDestinationProxyMessages.h"
#include "WebProcess.h"
#include <WebCore/AudioBus.h>
#include <WebCore/AudioDestination.h>

namespace WebKit {

using AudioBus = WebCore::AudioBus;
using AudioDestination = WebCore::AudioDestination;
using AudioIOCallback = WebCore::AudioIOCallback;

std::unique_ptr<AudioDestination> RemoteAudioDestinationProxy::create(AudioIOCallback& callback,
    const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate)
{
    return makeUnique<RemoteAudioDestinationProxy>(callback, inputDeviceId, numberOfInputChannels, numberOfOutputChannels, sampleRate);
}

RemoteAudioDestinationProxy::RemoteAudioDestinationProxy(AudioIOCallback& callback, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate)
    : m_callback(callback)
    , m_sampleRate(sampleRate)
{
    RemoteAudioDestinationIdentifier destinationID;

    auto& connection = WebProcess::singleton().ensureGPUProcessConnection();
    connection.connection().sendSync(
        Messages::RemoteAudioDestinationManager::CreateAudioDestination(inputDeviceId, numberOfInputChannels, numberOfOutputChannels, sampleRate),
        Messages::RemoteAudioDestinationManager::CreateAudioDestination::Reply(destinationID), 0);
    connection.messageReceiverMap().addMessageReceiver(Messages::RemoteAudioDestinationProxy::messageReceiverName(), destinationID.toUInt64(), *this);

    m_destinationID = destinationID;
}

RemoteAudioDestinationProxy::~RemoteAudioDestinationProxy()
{
    auto& connection =  WebProcess::singleton().ensureGPUProcessConnection();
    connection.messageReceiverMap().removeMessageReceiver(Messages::RemoteAudioDestinationProxy::messageReceiverName(), m_destinationID.toUInt64());

    connection.connection().sendWithAsyncReply(
        Messages::RemoteAudioDestinationManager::DeleteAudioDestination(m_destinationID), [] {
        // Can't remove this from proxyMap() here because the object would have been already deleted.
    });
}

void RemoteAudioDestinationProxy::start()
{
    WebProcess::singleton().ensureGPUProcessConnection().connection().sendSync(
        Messages::RemoteAudioDestinationManager::StartAudioDestination(m_destinationID),
        Messages::RemoteAudioDestinationManager::StartAudioDestination::Reply(m_isPlaying), 0);
}

void RemoteAudioDestinationProxy::stop()
{
    WebProcess::singleton().ensureGPUProcessConnection().connection().sendSync(
        Messages::RemoteAudioDestinationManager::StopAudioDestination(m_destinationID),
        Messages::RemoteAudioDestinationManager::StopAudioDestination::Reply(m_isPlaying), 0);
}

void RemoteAudioDestinationProxy::renderBuffer(const WebKit::RemoteAudioBusData& audioBusData, CompletionHandler<void()>&& completionHandler)
{
    ASSERT(audioBusData.framesToProcess);
    ASSERT(audioBusData.channelBuffers.size());
    auto audioBus = AudioBus::create(audioBusData.channelBuffers.size(), audioBusData.framesToProcess, false);
    for (unsigned i = 0; i < audioBusData.channelBuffers.size(); ++i)
        audioBus->setChannelMemory(i, (float*)audioBusData.channelBuffers[i]->data(), audioBusData.framesToProcess);

    m_callback.render(0, audioBus.get(), audioBusData.framesToProcess);

    completionHandler();
}

void RemoteAudioDestinationProxy::didChangeIsPlaying(bool isPlaying)
{
}

} // namespace WebKit

#endif // ENABLE(GPU_PROCESS) && ENABLE(WEB_AUDIO)