get_value_at()

double MayaFlux::Kakshya::VideoStreamContainer::get_value_at ( const std::vector< uint64_t > &  coordinates ) const

overridevirtual

Get a single value at the specified coordinates.

Parameters

coordinates

N-dimensional coordinates

Returns

Value at the specified location

Implements MayaFlux::Kakshya::NDDataContainer.

Definition at line 218 of file VideoStreamContainer.cpp.

{
    if (coordinates.size() < 4 || m_data.empty())
        return 0.0;
 
    const auto* pixels = std::get_if<std::vector<uint8_t>>(&m_data[0]);
    if (!pixels)
        return 0.0;
 
    const uint64_t frame = coordinates[0];
    const uint64_t y = coordinates[1];
    const uint64_t x = coordinates[2];
    const uint64_t c = coordinates[3];
 
    if (frame >= m_num_frames || y >= m_height || x >= m_width || c >= m_channels)
        return 0.0;
 
    const size_t idx = (frame * m_height * m_width * m_channels)
        + (y * m_width * m_channels)
        + (x * m_channels)
        + c;
 
    if (idx >= pixels->size())
        return 0.0;
 
    return static_cast<double>((*pixels)[idx]) / 255.0;
}

References m_channels, m_data, m_height, m_num_frames, and m_width.