advance_position() [2/2]

std::vector< uint64_t > MayaFlux::Kakshya::advance_position	(	const std::vector< uint64_t > &	current_positions,
		uint64_t	frames_to_advance,
		const ContainerDataStructure &	structure,
		bool	looping_enabled,
		const Region &	loop_region
	)

Advance current positions by a number of frames, with optional looping.

Parameters

current_positions	Current positions per channel.
frames_to_advance	Number of frames to advance.
structure	Container data structure (for total frames).
looping_enabled	Whether looping is enabled.
loop_region	Loop region for wrapping.

Returns

New advanced positions per channel.

Definition at line 153 of file CoordUtils.cpp.

{
    uint64_t num_channels = structure.get_channel_count();
    uint64_t total_frames = structure.get_samples_count_per_channel();
 
    if (current_positions.size() != num_channels) {
        throw std::invalid_argument(
            "Position vector size " + std::to_string(current_positions.size()) + " must match channel count " + std::to_string(num_channels));
    }
 
    std::vector<uint64_t> new_positions;
    new_positions.reserve(num_channels);
 
    for (size_t ch = 0; ch < num_channels; ++ch) {
        uint64_t current_frame = current_positions[ch];
        uint64_t new_frame = current_frame + frames_to_advance;
 
        if (new_frame >= total_frames) {
            if (looping_enabled && !loop_region.start_coordinates.empty()) {
                uint64_t loop_start = (ch < loop_region.start_coordinates.size())
                    ? loop_region.start_coordinates[ch]
                    : loop_region.start_coordinates[0];
                uint64_t loop_end = (ch < loop_region.end_coordinates.size())
                    ? loop_region.end_coordinates[ch]
                    : loop_region.end_coordinates[0];
 
                if (loop_end > loop_start) {
                    uint64_t loop_length = loop_end - loop_start + 1;
                    uint64_t overflow = new_frame - total_frames;
                    new_frame = loop_start + (overflow % loop_length);
                } else {
                    new_frame = loop_start;
                }
            } else {
                new_frame = total_frames - 1;
            }
        }
 
        new_positions.push_back(new_frame);
    }
 
    return new_positions;
}

References MayaFlux::Kakshya::Region::end_coordinates, MayaFlux::Kakshya::ContainerDataStructure::get_channel_count(), MayaFlux::Kakshya::ContainerDataStructure::get_samples_count_per_channel(), and MayaFlux::Kakshya::Region::start_coordinates.

Referenced by MayaFlux::Kakshya::SoundStreamContainer::advance_read_position(), MayaFlux::Kakshya::RegionProcessorBase::organize_container_data(), and MayaFlux::Kakshya::ContiguousAccessProcessor::process().

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