loop_playback_cursor.hpp

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#pragma once
 
#include <cstdint>
 
#include <pulp/audio/loop_types.hpp>
 
namespace pulp::audio {
 
struct LoopFrameReadPlan {
    double read_position = 0.0;
    double blend_position = 0.0;
    double primary_gain = 1.0;
    double blend_gain = 0.0;
    bool blend = false;
    bool wrapped = false;
};
 
struct LoopPlaybackAdvanceResult {
    bool active = false;
    bool wrapped = false;
};

class LoopPlaybackCursor {
public:
    bool set_region(const LoopRegion& region,
                    std::uint64_t source_frames) noexcept;
    void reset() noexcept;
    void start() noexcept;
    void stop() noexcept { active_ = false; }

    void set_playback_rate(double rate) noexcept;
    void set_playback_mode(LoopPlaybackMode mode) noexcept {
        region_.playback_mode = mode;
    }
 
    bool active() const noexcept { return active_; }
    double position() const noexcept { return position_; }
    double step() const noexcept;
    const LoopRegion& region() const noexcept { return region_; }
 
    LoopFrameReadPlan frame_read_plan() const noexcept;
    LoopPlaybackAdvanceResult advance() noexcept;
 
private:
    void initialize_entry() noexcept;
 
    LoopRegion region_;
    double position_ = 0.0;
    double playback_rate_ = 1.0;
    bool active_ = false;
    int pingpong_direction_ = 1;
    int step_direction_ = 1;
};
 
}  // namespace pulp::audio