Using Transcoder::push

Common Steps

1. Detect the input stream using MediaInfo and create a MediaSocket from it, or configure the input MediaSocket manually. Make sure you set the MediaSocket::file, and MediaSocket::stream properties to nullptr to indicate that data will be provided manually using Transcoder::push
2. Configure output MediaSocket, MediaPin, and VideoStreamInfo
3. Read data from your input and attach it to a new MediaBuffer object
4. Create a new MediaSample object, and set its buffer property
5. Pass the MediaSample object to Transcoder::push

JPEG

1. Configure input `MediaSocket`, `MediaPin`, and `VideoStreamInfo`

primo::ref<MediaSocket> createInputSocket(int width, int height)
{
        auto socket = primo::make_ref(Library::createMediaSocket());
        socket->setFile(nullptr);
        socket->setStream(nullptr);
        socket->setStreamType(StreamType::JPEG);

        auto pin = primo::make_ref(Library::createMediaPin());
        socket->pins()->add(pin.get());

        auto vsi = primo::make_ref(Library::createVideoStreamInfo());
        pin->setStreamInfo(vsi.get());

        vsi->setStreamType(StreamType::JPEG);
        vsi->setScanType(ScanType::Progressive);

        vsi->setFrameWidth(width);
        vsi->setFrameHeight(height);

        return socket;
}

2. Configure output `MediaSocket`, `MediaPin`, and `VideoStreamInfo`

primo::ref<MediaSocket> createOutputSocket(const wchar_t* fileName, int width, int height)
{
        auto socket = primo::make_ref(Library::createMediaSocket());
        socket->setFile(fileName);
        socket->setStreamType(StreamType::UncompressedVideo);

        auto pin = primo::make_ref(Library::createMediaPin());
        socket->pins()->add(pin.get());

        auto vsi = primo::make_ref(Library::createVideoStreamInfo());
        pin->setStreamInfo(vsi.get());

        vsi->setStreamType(StreamType::UncompressedVideo);
        vsi->setScanType(ScanType::Progressive);
        vsi->setColorFormat(ColorFormat::YUV420);

        vsi->setFrameWidth(width);
        vsi->setFrameHeight(height);

        return socket;
}

3. Create a new `MediaBuffer` and attach the JPEG data to it

vector<uint8_t> inputData = readFileBytes(inputFile);

auto buffer = primo::make_ref(Library::createMediaBuffer(inputData.size()));
buffer->attach(inputData.data(), inputData.size(), TRUE);

• The buffer must contain the data for at least one JPEG image, including the start marker (0xFF 0xD8) and the end marker (0xFF 0xD9). See ISO/IEC 10918-1 for more information about JPEG header structure.
• If the buffer contains more than one image, use the MediaBuffer::setData to indicate the offset and the size of the data.

4. Create a new `MediaSample` and set its buffer

auto sample = primo::make_ref(Library::createMediaSample());
sample->setBuffer(buffer.get());

5. Pass the sample to `Transcoder::push`

transcoder->push(0, sample.get());