95 lines
3.1 KiB
C++
95 lines
3.1 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 <array>
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#include <atomic>
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#include "AudioCommon/AudioStretcher.h"
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#include "AudioCommon/WaveFile.h"
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#include "Common/CommonTypes.h"
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class Mixer final
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{
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public:
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explicit Mixer(unsigned int BackendSampleRate);
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~Mixer();
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// Called from audio threads
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unsigned int Mix(short* samples, unsigned int numSamples);
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unsigned int MixSurround(float* samples, unsigned int num_samples);
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// Called from main thread
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void PushSamples(const short* samples, unsigned int num_samples);
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void PushStreamingSamples(const short* samples, unsigned int num_samples);
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void PushWiimoteSpeakerSamples(const short* samples, unsigned int num_samples,
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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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private:
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static constexpr u32 MAX_SAMPLES = 1024 * 4; // 128 ms
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static constexpr u32 INDEX_MASK = MAX_SAMPLES * 2 - 1;
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static constexpr int MAX_FREQ_SHIFT = 200; // Per 32000 Hz
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static constexpr float CONTROL_FACTOR = 0.2f;
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static constexpr u32 CONTROL_AVG = 32; // In freq_shift per FIFO size offset
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class MixerFifo final
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{
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public:
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MixerFifo(Mixer* mixer, unsigned sample_rate) : m_mixer(mixer), m_input_sample_rate(sample_rate)
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{
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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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unsigned int GetInputSampleRate() const;
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void SetVolume(unsigned int lvolume, unsigned int rvolume);
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unsigned int AvailableSamples() const;
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private:
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Mixer* m_mixer;
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unsigned m_input_sample_rate;
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std::array<short, MAX_SAMPLES * 2> m_buffer{};
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std::atomic<u32> m_indexW{0};
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std::atomic<u32> m_indexR{0};
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// Volume ranges from 0-256
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std::atomic<s32> m_LVolume{256};
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std::atomic<s32> m_RVolume{256};
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float m_numLeftI = 0.0f;
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u32 m_frac = 0;
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};
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MixerFifo m_dma_mixer{this, 32000};
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MixerFifo m_streaming_mixer{this, 48000};
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MixerFifo m_wiimote_speaker_mixer{this, 3000};
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unsigned int m_sampleRate;
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bool m_is_stretching = false;
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AudioCommon::AudioStretcher m_stretcher;
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std::array<short, MAX_SAMPLES * 2> m_scratch_buffer;
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std::array<float, MAX_SAMPLES * 2> m_float_conversion_buffer;
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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 = false;
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bool m_log_dsp_audio = false;
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// Current rate of emulation (1.0 = 100% speed)
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std::atomic<float> m_speed{0.0f};
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};
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