C++ (Cpp) ComPtr::Lock示例

示例#1

文件： MediaStreamer.cpp 项目： mbin/Win81App

bool MediaStreamer::GetNextBuffer(uint8* buffer, uint32 maxBufferSize, uint32* bufferLength)
{
    Microsoft::WRL::ComPtr<IMFSample> sample;
    Microsoft::WRL::ComPtr<IMFMediaBuffer> mediaBuffer;
    BYTE *audioData = nullptr;
    DWORD sampleBufferLength = 0;
    DWORD flags = 0;

    *bufferLength = 0;

    if (m_reader == nullptr)
    {
        return false;
    }

    DX::ThrowIfFailed(
        m_reader->ReadSample(MF_SOURCE_READER_FIRST_AUDIO_STREAM, 0, nullptr, &flags, nullptr, &sample)
        );

    if (sample == nullptr)
    {
        if (flags & MF_SOURCE_READERF_ENDOFSTREAM)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    DX::ThrowIfFailed(
        sample->ConvertToContiguousBuffer(&mediaBuffer)
        );

    DX::ThrowIfFailed(
        mediaBuffer->Lock(&audioData, nullptr, &sampleBufferLength)
        );

    // Only copy the sample if the remaining buffer is large enough.
    if (sampleBufferLength <= maxBufferSize)
    {
        CopyMemory(buffer, audioData, sampleBufferLength);
        *bufferLength = sampleBufferLength;
    }

    if (flags & MF_SOURCE_READERF_ENDOFSTREAM)
    {
        return true;
    }
    else
    {
        return false;
    }
}

示例#2

文件： MediaStreamer.cpp 项目： Teivaz/CocosSampleGame

bool MediaStreamer::GetNextBuffer(uint8* buffer, uint32 maxBufferSize, uint32* bufferLength)
{
    Microsoft::WRL::ComPtr<IMFSample> sample;
    Microsoft::WRL::ComPtr<IMFMediaBuffer> mediaBuffer;
    BYTE *audioData = nullptr;
    DWORD sampleBufferLength = 0;
    DWORD flags = 0;

    *bufferLength = 0;

    if (m_reader == nullptr)
    {
        return false;
    }

    ThrowIfFailed(
        m_reader->ReadSample(MF_SOURCE_READER_FIRST_AUDIO_STREAM, 0, nullptr, &flags, nullptr, &sample)
        );

    if (sample == nullptr)
    {
        if (flags & MF_SOURCE_READERF_ENDOFSTREAM)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    ThrowIfFailed(
        sample->ConvertToContiguousBuffer(&mediaBuffer)
        );

    ThrowIfFailed(
        mediaBuffer->Lock(&audioData, nullptr, &sampleBufferLength)
        );

    // If buffer isn't large enough, dump sample
    if (sampleBufferLength <= maxBufferSize)
    {
        CopyMemory(buffer, audioData, sampleBufferLength);
        *bufferLength = sampleBufferLength;
    }
    else
    {
#if defined(COCOS2D_DEBUG)
        OutputDebugString(L"Sample buffer dumped");
#endif
    }
    
    if (flags & MF_SOURCE_READERF_ENDOFSTREAM)
    {
        return true;
    }
    else
    {
        return false;
    }
}