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124 lines
3 KiB
C++
124 lines
3 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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#include "AudioCommon/WaveFile.h"
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#include "Common/StdMutex.h"
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// 16 bit Stereo
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#define MAX_SAMPLES (1024 * 2) // 64ms
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#define INDEX_MASK (MAX_SAMPLES * 2 - 1)
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#define LOW_WATERMARK 1280 // 40 ms
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#define MAX_FREQ_SHIFT 200 // per 32000 Hz
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#define CONTROL_FACTOR 0.2f // in freq_shift per fifo size offset
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#define CONTROL_AVG 32
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class CMixer {
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public:
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CMixer(unsigned int BackendSampleRate)
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: m_dma_mixer(this, 32000)
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, m_streaming_mixer(this, 48000)
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, m_sampleRate(BackendSampleRate)
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, m_logAudio(0)
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, m_throttle(false)
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, m_speed(0)
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{
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INFO_LOG(AUDIO_INTERFACE, "Mixer is initialized");
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}
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virtual ~CMixer() {}
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// Called from audio threads
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virtual unsigned int Mix(short* samples, unsigned int numSamples, bool consider_framelimit = true);
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// Called from main thread
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virtual void PushSamples(const short* samples, unsigned int num_samples);
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virtual void PushStreamingSamples(const short* samples, unsigned int num_samples);
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unsigned int GetSampleRate() const { return m_sampleRate; }
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void SetStreamingVolume(unsigned int lvolume, unsigned int rvolume);
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void SetThrottle(bool use) { m_throttle = use;}
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virtual void StartLogAudio(const std::string& filename)
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{
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if (! m_logAudio)
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{
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m_logAudio = true;
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g_wave_writer.Start(filename, GetSampleRate());
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g_wave_writer.SetSkipSilence(false);
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NOTICE_LOG(DSPHLE, "Starting Audio logging");
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}
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else
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{
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WARN_LOG(DSPHLE, "Audio logging has already been started");
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}
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}
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virtual void StopLogAudio()
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{
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if (m_logAudio)
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{
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m_logAudio = false;
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g_wave_writer.Stop();
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NOTICE_LOG(DSPHLE, "Stopping Audio logging");
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}
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else
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{
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WARN_LOG(DSPHLE, "Audio logging has already been stopped");
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}
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}
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std::mutex& MixerCritical() { return m_csMixing; }
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float GetCurrentSpeed() const { return m_speed; }
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void UpdateSpeed(volatile float val) { m_speed = val; }
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protected:
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class MixerFifo {
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public:
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MixerFifo(CMixer *mixer, unsigned sample_rate)
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: m_mixer(mixer)
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, m_input_sample_rate(sample_rate)
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, m_indexW(0)
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, m_indexR(0)
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, m_LVolume(256)
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, m_RVolume(256)
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, m_numLeftI(0.0f)
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{
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memset(m_buffer, 0, sizeof(m_buffer));
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}
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void PushSamples(const short* samples, unsigned int num_samples);
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unsigned int Mix(short* samples, unsigned int numSamples, bool consider_framelimit = true);
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void SetVolume(unsigned int lvolume, unsigned int rvolume);
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private:
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CMixer *m_mixer;
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unsigned m_input_sample_rate;
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short m_buffer[MAX_SAMPLES * 2];
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volatile u32 m_indexW;
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volatile u32 m_indexR;
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// Volume ranges from 0-256
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volatile s32 m_LVolume;
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volatile s32 m_RVolume;
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float m_numLeftI;
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};
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MixerFifo m_dma_mixer;
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MixerFifo m_streaming_mixer;
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unsigned int m_sampleRate;
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WaveFileWriter g_wave_writer;
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bool m_logAudio;
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bool m_throttle;
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std::mutex m_csMixing;
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volatile float m_speed; // Current rate of the emulation (1.0 = 100% speed)
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};
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