extract_channel_data()

void MayaFlux::Buffers::SoundStreamReader::extract_channel_data ( std::span< double >  output )

private

Extract channel data from the container into the output buffer.

Parameters

output

Output span to fill.

Definition at line 91 of file SoundContainerBuffer.cpp.

{
    if (!m_container) {
        std::ranges::fill(output, 0.0);
        return;
    }
 
    auto sound_container = std::dynamic_pointer_cast<Kakshya::SoundStreamContainer>(m_container);
    if (!sound_container) {
        std::ranges::fill(output, 0.0);
        return;
    }
 
    auto& processed_data = sound_container->get_processed_data();
    if (processed_data.empty()) {
        std::ranges::fill(output, 0.0);
        return;
    }
 
    auto structure = sound_container->get_structure();
 
    if (structure.organization == Kakshya::OrganizationStrategy::INTERLEAVED) {
        thread_local std::vector<double> temp_storage;
        auto data_span = Kakshya::extract_from_variant<double>(processed_data[0], temp_storage);
 
        auto num_channels = structure.get_channel_count();
        auto samples_to_copy = std::min(static_cast<size_t>(output.size()),
            static_cast<size_t>(data_span.size() / num_channels));
 
        for (auto i : std::views::iota(0UZ, samples_to_copy)) {
            auto interleaved_idx = i * num_channels + m_source_channel;
            output[i] = (interleaved_idx < data_span.size()) ? data_span[interleaved_idx] : 0.0;
        }
 
        if (samples_to_copy < output.size()) {
            std::ranges::fill(output | std::views::drop(samples_to_copy), 0.0);
        }
 
    } else {
        if (m_source_channel >= processed_data.size()) {
            std::ranges::fill(output, 0.0);
            return;
        }
 
        thread_local std::vector<double> temp_storage;
        auto channel_data_span = Kakshya::extract_from_variant<double>(processed_data[m_source_channel], temp_storage);
 
        auto samples_to_copy = std::min(output.size(), channel_data_span.size());
        std::ranges::copy_n(channel_data_span.begin(), samples_to_copy, output.begin());
 
        if (samples_to_copy < output.size()) {
            std::ranges::fill(output | std::views::drop(samples_to_copy), 0.0);
        }
    }
}

References MayaFlux::Kakshya::INTERLEAVED, m_container, and m_source_channel.

Referenced by on_attach(), and processing_function().

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