Source/WebKit/GPUProcess/webrtc/RemoteMediaRecorder.cpp

/*
 * Copyright (C) 2020 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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 *
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#include "config.h"
#include "RemoteMediaRecorder.h"

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

#include "SharedRingBufferStorage.h"
#include <WebCore/CARingBuffer.h>
#include <WebCore/ImageTransferSessionVT.h>
#include <WebCore/RemoteVideoSample.h>
#include <WebCore/WebAudioBufferList.h>
#include <wtf/CompletionHandler.h>

using namespace WebCore;

namespace WebKit {

std::unique_ptr<RemoteMediaRecorder> RemoteMediaRecorder::create(GPUConnectionToWebProcess& gpuConnectionToWebProcess, MediaRecorderIdentifier identifier, bool recordAudio, int width, int height)
{
    auto writer = MediaRecorderPrivateWriter::create(recordAudio, width, height);
    if (!writer)
        return nullptr;
    return std::unique_ptr<RemoteMediaRecorder>(new RemoteMediaRecorder { gpuConnectionToWebProcess, identifier, writer.releaseNonNull(), recordAudio });
}

RemoteMediaRecorder::RemoteMediaRecorder(GPUConnectionToWebProcess& gpuConnectionToWebProcess, MediaRecorderIdentifier identifier, Ref<MediaRecorderPrivateWriter>&& writer, bool recordAudio)
    : m_gpuConnectionToWebProcess(gpuConnectionToWebProcess)
    , m_identifier(identifier)
    , m_writer(WTFMove(writer))
{
    if (recordAudio)
        m_ringBuffer = makeUnique<CARingBuffer>(makeUniqueRef<SharedRingBufferStorage>(nullptr));
}

RemoteMediaRecorder::~RemoteMediaRecorder()
{
}

SharedRingBufferStorage& RemoteMediaRecorder::storage()
{
    return static_cast<SharedRingBufferStorage&>(m_ringBuffer->storage());
}

void RemoteMediaRecorder::audioSamplesStorageChanged(const SharedMemory::Handle& handle, const WebCore::CAAudioStreamDescription& description, uint64_t numberOfFrames)
{
    ASSERT(m_ringBuffer);
    if (!m_ringBuffer)
        return;

    m_description = description;

    if (handle.isNull()) {
        m_ringBuffer->deallocate();
        storage().setReadOnly(false);
        storage().setStorage(nullptr);
        return;
    }

    auto memory = SharedMemory::map(handle, SharedMemory::Protection::ReadOnly);
    storage().setStorage(WTFMove(memory));
    storage().setReadOnly(true);

    m_ringBuffer->allocate(description, numberOfFrames);
}

void RemoteMediaRecorder::audioSamplesAvailable(MediaTime time, uint64_t numberOfFrames, uint64_t startFrame, uint64_t endFrame)
{
    ASSERT(m_ringBuffer);
    if (!m_ringBuffer)
        return;

    m_ringBuffer->setCurrentFrameBounds(startFrame, endFrame);

    WebAudioBufferList audioData(m_description, numberOfFrames);
    m_ringBuffer->fetch(audioData.list(), numberOfFrames, time.timeValue());

    m_writer->appendAudioSampleBuffer(audioData, m_description, time, numberOfFrames);
}

void RemoteMediaRecorder::videoSampleAvailable(WebCore::RemoteVideoSample&& remoteSample)
{
    if (!m_imageTransferSession || m_imageTransferSession->pixelFormat() != remoteSample.videoFormat())
        m_imageTransferSession = ImageTransferSessionVT::create(remoteSample.videoFormat());

    if (!m_imageTransferSession) {
        ASSERT_NOT_REACHED();
        return;
    }

    auto sampleBuffer = m_imageTransferSession->createMediaSample(remoteSample.surface(), remoteSample.time(), remoteSample.size());
    if (!sampleBuffer) {
        ASSERT_NOT_REACHED();
        return;
    }

    m_writer->appendVideoSampleBuffer(sampleBuffer->platformSample().sample.cmSampleBuffer);
}

void RemoteMediaRecorder::fetchData(CompletionHandler<void(IPC::DataReference&&, const String& mimeType)>&& completionHandler)
{
    static NeverDestroyed<const String> mp4MimeType(MAKE_STATIC_STRING_IMPL("video/mp4"));
    m_writer->fetchData([&mp4MimeType = mp4MimeType.get(), completionHandler = WTFMove(completionHandler)](auto&& data) mutable {
        auto* pointer = reinterpret_cast<const uint8_t*>(data ? data->data() : nullptr);
        completionHandler(IPC::DataReference { pointer, data ? data->size() : 0 }, mp4MimeType);
    });
}

void RemoteMediaRecorder::stopRecording()
{
    m_writer->stopRecording();
}

}

#endif