DecoderCDDA.h

#pragma once

#include "Decoder.h"

#include "CDDAMedia.h"

#include <string>

class DecoderCDDA : public Decoder
{
public:
	// 'cddaMedia' - CD audio disc information.
	// 'track' - track number.
	// Throws a std::runtime_error exception if the file could not be loaded.
	DecoderCDDA( const CDDAMedia& cddaMedia, const long track );

	~DecoderCDDA() override;

	// Reads sample data.
	// 'buffer' - output buffer (floating point format scaled to +/-1.0f).
	// 'sampleCount' - number of samples to read.
	// Returns the number of samples read, or zero if the stream has ended.
	long Read( float* buffer, const long sampleCount ) override;

	// Seeks to a 'position' in the stream, in seconds.
	// Returns the new position in seconds.
	float Seek( const float position ) override;

	// Returns the track gain, in dB, or nullopt if the calculation failed.
	// 'canContinue' - callback which returns whether the calculation can continue.
	// 'secondslimit' - number of seconds to devote to calculating an estimate, or 0 to perform a complete calculation.
	std::optional<float> CalculateTrackGain( CanContinue canContinue, const float secondsLimit = 0 ) override;

private:
	// CD audio disc information.
	const CDDAMedia m_CDDAMedia;

	// Start sector.
	const long m_SectorStart;

	// End sector.
	const long m_SectorEnd;

	// CD audio handle.
	const HANDLE m_Handle;

	// Data buffer.
	CDDAMedia::Data m_Buffer;

	// Current sector.
	long m_CurrentSector;

	// Current buffer position.
	size_t m_CurrentBufPos;
};