mirror of https://github.com/PCSX2/pcsx2.git
SPU2X: New stretcher: hopefully works better than r4834 (same goals as r4834: better resiliance to very high/low fps, compared to r4820).
I'm not fully happy with it, as it's a bit complicated for my taste, so feedback about how it performs will be appreciated. git-svn-id: http://pcsx2.googlecode.com/svn/trunk@4840 96395faa-99c1-11dd-bbfe-3dabce05a288
This commit is contained in:
avihal@gmail.com
parent
34569047b4
commit
36fc051238
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@ -81,19 +81,22 @@ float SndBuffer::GetStatusPct()
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// These params were tested to show good respond and stability, on all audio systems (dsound, wav, port audio, xaudio2),
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// even at extreme small latency of 50ms which can handle 50%-100% variations without audible glitches.
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int targetIPS=750;
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//running average can be implemented in O(1) time.
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//For the sake of simplicity, this average is calculated in O(<buffer-size>). Possibly improve later.
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#define STRETCH_AVERAGE_LEN 50
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#define MAX_STRETCH_AVERAGE_LEN 100
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int STRETCH_AVERAGE_LEN=50.0 *targetIPS/750;
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//adds a value to the running average buffer, and return new running average.
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float addToAvg(float val){
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static float avg_fullness[STRETCH_AVERAGE_LEN]={0};
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static float avg_fullness[MAX_STRETCH_AVERAGE_LEN]={0};
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static int nextAvgPos=0;
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avg_fullness[nextAvgPos]=val;
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nextAvgPos=(nextAvgPos+1)%STRETCH_AVERAGE_LEN;
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float sum=0;
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for(int i=0; i<STRETCH_AVERAGE_LEN; i++)
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for(int c=0, i=(nextAvgPos-1)%STRETCH_AVERAGE_LEN; c<STRETCH_AVERAGE_LEN; c++, i=(i+STRETCH_AVERAGE_LEN-1)%STRETCH_AVERAGE_LEN)
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sum+=avg_fullness[i];
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sum= (float)sum/(float)STRETCH_AVERAGE_LEN;
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@ -110,91 +113,107 @@ T clamp(T val, T min, T max){
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//actual stretch algorithm implementation
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void SndBuffer::UpdateTempoChangeSoundTouch2()
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{
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//base aim at buffer filled %
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float baseTargetFullness=0.05;
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//threshold params (hysteresis)
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static const float hys_ok_factor=1.03;
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static const int hys_min_ok_count=100; //consecutive iterations within hys_ok before going to 1:1 mode
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static const float hys_bad_factor=1.2;
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long targetSamplesReservoir=48*SndOutLatencyMS;//48000*SndOutLatencyMS/1000
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//base aim at buffer filled %
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float baseTargetFullness=(double)targetSamplesReservoir;///(double)m_size;//0.05;
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//state vars
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static bool inside_hysteresis=false;
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static int hys_ok_count=0;
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static float dynamicTargetFullness=baseTargetFullness;
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//some precalculated values
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static const float hys_ok_min=1.0/hys_ok_factor;
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static const float hys_ok_max=hys_ok_factor;
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static const float hys_bad_min=1.0/hys_bad_factor;
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static const float hys_bad_max=hys_bad_factor;
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float bufferFullness=(float)m_data;///(float)m_size;
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float bufferFullness=(float)m_data/(float)m_size;
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static float last_bufferFullness=0;
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if(last_bufferFullness != bufferFullness){// only recalculate if buffer changes
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last_bufferFullness = bufferFullness;
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float tempoAdjust=bufferFullness/dynamicTargetFullness;
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float avgerage = addToAvg(tempoAdjust);
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tempoAdjust = avgerage;
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tempoAdjust = clamp( tempoAdjust, 0.05f, 10.0f);
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dynamicTargetFullness += (baseTargetFullness/tempoAdjust - dynamicTargetFullness)/50.0;
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if(
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tempoAdjust == clamp(tempoAdjust, 0.9f, 1.1f)
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&& dynamicTargetFullness == clamp( dynamicTargetFullness, baseTargetFullness*0.9f, baseTargetFullness*1.1f)
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)
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dynamicTargetFullness=baseTargetFullness;
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if( !inside_hysteresis )
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{
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if( tempoAdjust == clamp( tempoAdjust, hys_ok_min, hys_ok_max ) )
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hys_ok_count++;
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else
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hys_ok_count=0;
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if( hys_ok_count >= hys_min_ok_count ){
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inside_hysteresis=true;
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if(MsgOverruns()) printf("======> stretch: None (1:1)\n");
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{//test current iterations/sec every 0.5s, and change algo params accordingly if different than previous IPS more than 30%
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static long iters=0;
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static wxDateTime last=wxDateTime::UNow();
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wxDateTime unow=wxDateTime::UNow();
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wxTimeSpan delta = unow.Subtract(last);
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if( delta.GetMilliseconds()>500 ){
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int pot_targetIPS=1000.0/delta.GetMilliseconds().ToDouble()*iters;
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if(pot_targetIPS != clamp(pot_targetIPS, int((float)targetIPS/1.3f), int((float)targetIPS*1.3f)) ){
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if(MsgOverruns()) printf("Stretcher: setting iters/sec from %d to %d\n", targetIPS, pot_targetIPS);
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targetIPS=pot_targetIPS;
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STRETCH_AVERAGE_LEN=clamp((int)(50.0f *(float)targetIPS/750.0f), 3, MAX_STRETCH_AVERAGE_LEN);
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}
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}
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else if( tempoAdjust != clamp( tempoAdjust, hys_bad_min, hys_bad_max ) ){
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if(MsgOverruns()) printf("~~~~~~> stretch: Dynamic\n");
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inside_hysteresis=false;
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hys_ok_count=0;
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last=unow;
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iters=0;
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}
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iters++;
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}
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if(inside_hysteresis)
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tempoAdjust=1.0;
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//Algorithm params: (threshold params (hysteresis), etc)
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const float hys_ok_factor=1.04;
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int hys_min_ok_count=clamp((int)(50.0 *(float)targetIPS/750.0), 2, 100); //consecutive iterations within hys_ok before going to 1:1 mode
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const float hys_bad_factor=1.2;
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int compensationDivider=clamp((int)(100.0 *(float)targetIPS/750), 15, 150);
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if(MsgOverruns()){
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static int iters=0;
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static wxDateTime last=wxDateTime::UNow();
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wxDateTime unow=wxDateTime::UNow();
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wxTimeSpan delta = unow.Subtract(last);
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float tempoAdjust=bufferFullness/dynamicTargetFullness;
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float avgerage = addToAvg(tempoAdjust);
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tempoAdjust = avgerage;
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tempoAdjust = clamp( tempoAdjust, 0.05f, 10.0f);
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if(delta.GetMilliseconds()>1000){//report buffers state and tempo adjust every second
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printf("buffers[->%.2f]: %.3f (%3.0f%%), tempo adjust: %f, compensated target: %.3f, iterations: %d\n",
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(double)baseTargetFullness, (double)bufferFullness, (double)(100.0*bufferFullness/baseTargetFullness), (double)tempoAdjust, (double)dynamicTargetFullness, iters);
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last=unow;
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iters=0;
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}
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iters++;
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}
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pSoundTouch->setTempo(tempoAdjust);
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dynamicTargetFullness += (baseTargetFullness/tempoAdjust - dynamicTargetFullness)/(double)compensationDivider;
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if(
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tempoAdjust == clamp(tempoAdjust, 0.9f, 1.1f)
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&& dynamicTargetFullness == clamp( dynamicTargetFullness, baseTargetFullness*0.9f, baseTargetFullness*1.1f)
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)
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dynamicTargetFullness=baseTargetFullness;
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//collect some stats...
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if(tempoAdjust==1.0)
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ts_stats_normalblocks++;
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if( !inside_hysteresis )
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{
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if( tempoAdjust == clamp( tempoAdjust, 1.0f/hys_ok_factor, hys_ok_factor ) )
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hys_ok_count++;
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else
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ts_stats_stretchblocks++;
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hys_ok_count=0;
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if( hys_ok_count >= hys_min_ok_count ){
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inside_hysteresis=true;
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if(MsgOverruns()) printf("======> stretch: None (1:1)\n");
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}
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}
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else if( tempoAdjust != clamp( tempoAdjust, 1.0f/hys_bad_factor, hys_bad_factor ) ){
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if(MsgOverruns()) printf("~~~~~~> stretch: Dynamic\n");
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inside_hysteresis=false;
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hys_ok_count=0;
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}
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if(inside_hysteresis)
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tempoAdjust=1.0;
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if(MsgOverruns()){
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static int iters=0;
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static wxDateTime last=wxDateTime::UNow();
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wxDateTime unow=wxDateTime::UNow();
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wxTimeSpan delta = unow.Subtract(last);
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if(delta.GetMilliseconds()>1000){//report buffers state and tempo adjust every second
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printf("buffers: %4d ms (%3.0f%%), tempo: %f, comp: %2.3f, iters: %d, (N-IPS:%d -> avg:%d, minokc:%d, div:%d)\n",
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(int)(m_data/48), (double)(100.0*bufferFullness/baseTargetFullness), (double)tempoAdjust, (double)(dynamicTargetFullness/baseTargetFullness), iters, (int)targetIPS
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, STRETCH_AVERAGE_LEN, hys_min_ok_count, compensationDivider
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);
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last=unow;
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iters=0;
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}
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iters++;
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}
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pSoundTouch->setTempo(tempoAdjust);
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//collect some unuseful stats...
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if(tempoAdjust==1.0)
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ts_stats_normalblocks++;
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else
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ts_stats_stretchblocks++;
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return;
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}
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void SndBuffer::UpdateTempoChangeSoundTouch()
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{
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float statusPct = GetStatusPct();
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@ -436,7 +455,7 @@ void SndBuffer::timeStretchWrite()
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if( MsgOverruns() )
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{
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if( progress )
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if( progress && (ts_stats_normalblocks + ts_stats_stretchblocks))
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{
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if( ++ts_stats_logcounter > 150 )
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{
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