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https://github.com/SourMesen/Mesen-S.git
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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
#include "stdafx.h"
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#include "SoundResampler.h"
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#include "Console.h"
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#include "Spc.h"
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#include "EmuSettings.h"
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#include "SoundMixer.h"
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#include "VideoRenderer.h"
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#include "../Utilities/HermiteResampler.h"
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SoundResampler::SoundResampler(Console *console)
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{
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_console = console;
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}
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SoundResampler::~SoundResampler()
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{
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}
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double SoundResampler::GetRateAdjustment()
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{
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return _rateAdjustment;
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}
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double SoundResampler::GetTargetRateAdjustment()
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{
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AudioConfig cfg = _console->GetSettings()->GetAudioConfig();
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bool isRecording = _console->GetSoundMixer()->IsRecording() || _console->GetVideoRenderer()->IsRecording();
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if(!isRecording && !cfg.DisableDynamicSampleRate) {
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//Don't deviate from selected sample rate while recording
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//TODO: Have 2 output streams (one for recording, one for the speakers)
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AudioStatistics stats = _console->GetSoundMixer()->GetStatistics();
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if(stats.AverageLatency > 0 && _console->GetSettings()->GetEmulationSpeed() == 100) {
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//Try to stay within +/- 3ms of requested latency
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constexpr int32_t maxGap = 3;
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constexpr int32_t maxSubAdjustment = 3600;
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int32_t requestedLatency = (int32_t)cfg.AudioLatency;
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double latencyGap = stats.AverageLatency - requestedLatency;
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double adjustment = std::min(0.0025, (std::ceil((std::abs(latencyGap) - maxGap) * 8)) * 0.00003125);
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if(latencyGap < 0 && _underTarget < maxSubAdjustment) {
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_underTarget++;
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} else if(latencyGap > 0 && _underTarget > -maxSubAdjustment) {
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_underTarget--;
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}
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//For every ~1 second spent under/over target latency, further adjust rate (GetTargetRate is called approx. 3x per frame)
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//This should slowly get us closer to the actual output rate of the sound card
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double subAdjustment = 0.00003125 * _underTarget / 180;
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if(adjustment > 0) {
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if(latencyGap > maxGap) {
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_rateAdjustment = 1 - adjustment + subAdjustment;
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} else if(latencyGap < -maxGap) {
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_rateAdjustment = 1 + adjustment + subAdjustment;
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}
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} else if(std::abs(latencyGap) < 1) {
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//Restore normal rate once we get within +/- 1ms
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_rateAdjustment = 1.0 + subAdjustment;
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}
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} else {
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_underTarget = 0;
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_rateAdjustment = 1.0;
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}
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} else {
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_underTarget = 0;
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_rateAdjustment = 1.0;
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}
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return _rateAdjustment;
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}
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void SoundResampler::UpdateTargetSampleRate(uint32_t sourceRate, uint32_t sampleRate)
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{
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double spcSampleRate = sourceRate;
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if(_console->GetSettings()->GetVideoConfig().IntegerFpsMode) {
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//Adjust sample rate when running at 60.0 fps instead of 60.1
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switch(_console->GetRegion()) {
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default:
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case ConsoleRegion::Ntsc: spcSampleRate = sourceRate * (60.0 / _console->GetFps()); break;
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case ConsoleRegion::Pal: spcSampleRate = sourceRate * (50.0 / _console->GetFps()); break;
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}
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}
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double targetRate = sampleRate * GetTargetRateAdjustment();
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if(targetRate != _previousTargetRate || spcSampleRate != _prevSpcSampleRate) {
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_previousTargetRate = targetRate;
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_prevSpcSampleRate = spcSampleRate;
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_resampler.SetSampleRates(spcSampleRate, targetRate);
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}
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}
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uint32_t SoundResampler::Resample(int16_t *inSamples, uint32_t sampleCount, uint32_t sourceRate, uint32_t sampleRate, int16_t *outSamples)
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{
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UpdateTargetSampleRate(sourceRate, sampleRate);
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return _resampler.Resample(inSamples, sampleCount, outSamples);
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} |