StereoResampler.h

// Copyright (c) 2015- PPSSPP Project and Dolphin Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

// Adapted from Dolphin.

#pragma once

#include <cstdint>
#include <atomic>

#include "Common/CommonTypes.h"

struct AudioDebugStats;

class StereoResampler {
public:
	StereoResampler();
	~StereoResampler();

	// Called from audio threads
	unsigned int Mix(short* samples, unsigned int numSamples, bool consider_framelimit, int sampleRate);

	// Called from main thread
	// This clamps the samples to 16-bit before starting to work on them.
	void PushSamples(const s32* samples, unsigned int num_samples);

	void Clear();

	void GetAudioDebugStats(char *buf, size_t bufSize);
	void ResetStatCounters();

private:
	void UpdateBufferSize();

	int m_maxBufsize;
	int m_targetBufsize;

	unsigned int m_input_sample_rate = 44100;
	int16_t *m_buffer;
	std::atomic<u32> m_indexW;
	std::atomic<u32> m_indexR;
	float m_numLeftI = 0.0f;

	u32 m_frac = 0;
	float output_sample_rate_ = 0.0;
	int lastBufSize_ = 0;
	int lastPushSize_ = 0;
	u32 ratio_ = 0;

	int underrunCount_ = 0;
	int overrunCount_ = 0;
	int underrunCountTotal_ = 0;
	int overrunCountTotal_ = 0;

	int droppedSamples_ = 0;

	int64_t inputSampleCount_ = 0;
	int64_t outputSampleCount_ = 0;

	double startTime_ = 0.0;
};