dolphin/Source/Core/AudioCommon/Mixer.h

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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include "AudioCommon/WaveFile.h"
#include "Common/StdMutex.h"
// 16 bit Stereo
#define MAX_SAMPLES (1024 * 2) // 64ms
#define INDEX_MASK (MAX_SAMPLES * 2 - 1)
#define LOW_WATERMARK 1280 // 40 ms
#define MAX_FREQ_SHIFT 200 // per 32000 Hz
#define CONTROL_FACTOR 0.2 // in freq_shift per fifo size offset
#define CONTROL_AVG 32
class CMixer {
public:
CMixer(unsigned int AISampleRate = 48000, unsigned int DACSampleRate = 48000, unsigned int BackendSampleRate = 32000)
: m_aiSampleRate(AISampleRate)
, m_dacSampleRate(DACSampleRate)
, m_bits(16)
, m_channels(2)
, m_HLEready(false)
, m_logAudio(0)
, m_indexW(0)
, m_indexR(0)
, m_numLeftI(0.0f)
{
// AyuanX: The internal (Core & DSP) sample rate is fixed at 32KHz
// So when AI/DAC sample rate differs than 32KHz, we have to do re-sampling
m_sampleRate = BackendSampleRate;
memset(m_buffer, 0, sizeof(m_buffer));
INFO_LOG(AUDIO_INTERFACE, "Mixer is initialized (AISampleRate:%i, DACSampleRate:%i)", AISampleRate, DACSampleRate);
}
virtual ~CMixer() {}
// Called from audio threads
virtual unsigned int Mix(short* samples, unsigned int numSamples, bool consider_framelimit = true);
virtual void Premix(short * /*samples*/, unsigned int /*numSamples*/) {}
// Called from main thread
virtual void PushSamples(const short* samples, unsigned int num_samples);
unsigned int GetSampleRate() const {return m_sampleRate;}
void SetThrottle(bool use) { m_throttle = use;}
// TODO: do we need this
bool IsHLEReady() const { return m_HLEready;}
void SetHLEReady(bool ready) { m_HLEready = ready;}
// ---------------------
virtual void StartLogAudio(const char *filename) {
if (! m_logAudio) {
m_logAudio = true;
g_wave_writer.Start(filename, GetSampleRate());
g_wave_writer.SetSkipSilence(false);
NOTICE_LOG(DSPHLE, "Starting Audio logging");
} else {
WARN_LOG(DSPHLE, "Audio logging has already been started");
}
}
virtual void StopLogAudio() {
if (m_logAudio) {
m_logAudio = false;
g_wave_writer.Stop();
NOTICE_LOG(DSPHLE, "Stopping Audio logging");
} else {
WARN_LOG(DSPHLE, "Audio logging has already been stopped");
}
}
std::mutex& MixerCritical() { return m_csMixing; }
float GetCurrentSpeed() const { return m_speed; }
void UpdateSpeed(volatile float val) { m_speed = val; }
protected:
unsigned int m_sampleRate;
unsigned int m_aiSampleRate;
unsigned int m_dacSampleRate;
int m_bits;
int m_channels;
WaveFileWriter g_wave_writer;
bool m_HLEready;
bool m_logAudio;
bool m_throttle;
short m_buffer[MAX_SAMPLES * 2];
volatile u32 m_indexW;
volatile u32 m_indexR;
std::mutex m_csMixing;
float m_numLeftI;
volatile float m_speed; // Current rate of the emulation (1.0 = 100% speed)
private:
};