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95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
// Copyright 2009 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 <atomic>
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#include <cstring>
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#include <mutex>
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#include "AudioCommon/WaveFile.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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{
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public:
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CMixer(unsigned int BackendSampleRate);
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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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virtual void PushWiimoteSpeakerSamples(const short* samples, unsigned int num_samples, unsigned int sample_rate);
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unsigned int GetSampleRate() const { return m_sampleRate; }
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void SetDMAInputSampleRate(unsigned int rate);
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void SetStreamInputSampleRate(unsigned int rate);
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void SetStreamingVolume(unsigned int lvolume, unsigned int rvolume);
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void SetWiimoteSpeakerVolume(unsigned int lvolume, unsigned int rvolume);
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void StartLogDTKAudio(const std::string& filename);
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void StopLogDTKAudio();
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void StartLogDSPAudio(const std::string& filename);
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void StopLogDSPAudio();
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float GetCurrentSpeed() const { return m_speed.load(); }
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void UpdateSpeed(float val) { m_speed.store(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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, m_frac(0)
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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 SetInputSampleRate(unsigned int rate);
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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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std::atomic<u32> m_indexW;
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std::atomic<u32> m_indexR;
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// Volume ranges from 0-256
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std::atomic<s32> m_LVolume;
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std::atomic<s32> m_RVolume;
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float m_numLeftI;
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u32 m_frac;
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};
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MixerFifo m_dma_mixer;
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MixerFifo m_streaming_mixer;
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MixerFifo m_wiimote_speaker_mixer;
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unsigned int m_sampleRate;
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WaveFileWriter m_wave_writer_dtk;
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WaveFileWriter m_wave_writer_dsp;
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bool m_log_dtk_audio;
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bool m_log_dsp_audio;
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std::atomic<float> m_speed; // Current rate of the emulation (1.0 = 100% speed)
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};
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