Source/WebKit/GPUProcess/media/RemoteAudioSourceProviderProxy.cpp

/*
 * Copyright (C) 2019-2020 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    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
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#include "config.h"
#include "RemoteAudioSourceProviderProxy.h"

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

#include "RemoteAudioSourceProviderManagerMessages.h"
#include <WebCore/AudioSourceProviderAVFObjC.h>

namespace WebKit {

Ref<RemoteAudioSourceProviderProxy> RemoteAudioSourceProviderProxy::create(WebCore::MediaPlayerIdentifier identifier, Ref<IPC::Connection>&& connection, AudioSourceProviderAVFObjC& localProvider)
{
    auto remoteProvider = adoptRef(*new RemoteAudioSourceProviderProxy(identifier, WTFMove(connection)));

    localProvider.setRingBufferCreationCallback([remoteProvider]() {
        return remoteProvider->createRingBuffer();
    });
    localProvider.setAudioCallback([remoteProvider](auto startFrame, auto numberOfFrames) {
        remoteProvider->newAudioSamples(startFrame, numberOfFrames);
    });

    return remoteProvider;
}

RemoteAudioSourceProviderProxy::RemoteAudioSourceProviderProxy(WebCore::MediaPlayerIdentifier identifier, Ref<IPC::Connection>&& connection)
    : m_identifier(identifier)
    , m_connection(WTFMove(connection))
{
}

RemoteAudioSourceProviderProxy::~RemoteAudioSourceProviderProxy() = default;

UniqueRef<CARingBuffer> RemoteAudioSourceProviderProxy::createRingBuffer()
{
    return makeUniqueRef<CARingBuffer>(makeUniqueRef<SharedRingBufferStorage>([protectedThis = Ref { *this }](SharedMemory* memory, const CAAudioStreamDescription& format, size_t frameCount) mutable {
        protectedThis->storageChanged(memory, format, frameCount);
    }));
}

void RemoteAudioSourceProviderProxy::newAudioSamples(uint64_t startFrame, uint64_t numberOfFrames)
{
    m_connection->send(Messages::RemoteAudioSourceProviderManager::AudioSamplesAvailable { m_identifier, startFrame, numberOfFrames }, 0);
}

void RemoteAudioSourceProviderProxy::storageChanged(SharedMemory* memory, const CAAudioStreamDescription& format, size_t frameCount)
{
    SharedMemory::Handle handle;
    if (memory)
        memory->createHandle(handle, SharedMemory::Protection::ReadOnly);

    // FIXME: Send the actual data size with IPCHandle.
#if OS(DARWIN) || OS(WINDOWS)
    uint64_t dataSize = handle.size();
#else
    uint64_t dataSize = 0;
#endif
    m_connection->send(Messages::RemoteAudioSourceProviderManager::AudioStorageChanged { m_identifier, SharedMemory::IPCHandle { WTFMove(handle),  dataSize }, format, frameCount }, 0);
}

} // namespace WebKit

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