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Bug Fix: Restructure Rubber Band gapless handler

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Change how samples are accounted for by the filter.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
This commit is contained in:
Christopher Snowhill 2025-03-04 00:40:49 -08:00
parent bce00aff2e
commit 019bdd7a36
1 changed files with 15 additions and 13 deletions
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28
Audio/Chain/DSP/DSPRubberbandNode.m
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@ -28,7 +28,8 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
BOOL tsrestartengine;
double tempo, pitch;
double lastTempo, lastPitch;
double stretchIn, stretchOut;
double countIn;
uint64_t countOut;
double streamTimestamp;
double streamTimeRatio;
@ -265,8 +266,8 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
tsrestartengine = NO;
flushed = NO;
stretchIn = 0.0;
stretchOut = 0.0;
countIn = 0.0;
countOut = 0;
return YES;
}
@ -443,9 +444,9 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
streamTimeRatio = [chunk streamTimeRatio];
isHDCD = [chunk isHDCD];
stretchIn += [chunk duration] / tempo;
size_t frameCount = [chunk frameCount];
countIn += ((double)frameCount) / tempo;
NSData *sampleData = [chunk removeSamples:frameCount];
for (size_t i = 0; i < channels; ++i) {
@ -487,11 +488,10 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
if(flushed) {
if(samplesBuffered > 0) {
ssize_t delta = (stretchIn - stretchOut) * inputFormat.mSampleRate;
if(delta > 0 && samplesBuffered > delta) {
// Seems that Rubber Band over-flushes when it hits end of stream
// Also somehow, this was being miscalculated before and ending up negative
samplesBuffered = delta;
ssize_t ideal = (ssize_t)floor(countIn + 0.5);
if(countOut + samplesBuffered > ideal) {
// Rubber Band does not account for flushing duration in real time mode
samplesBuffered = ideal - countOut;
}
}
}
@ -507,9 +507,9 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
[outputChunk setStreamTimestamp:streamTimestamp];
[outputChunk setStreamTimeRatio:streamTimeRatio * tempo];
[outputChunk assignSamples:&rsOutBuffer[0] frameCount:samplesBuffered];
countOut += samplesBuffered;
samplesBuffered = 0;
double chunkDuration = [outputChunk duration];
stretchOut += chunkDuration;
streamTimestamp += chunkDuration * [outputChunk streamTimeRatio];
}
@ -525,9 +525,11 @@ static void * kDSPRubberbandNodeContext = &kDSPRubberbandNodeContext;
// how much audio will be lopped off at the end of the process.
//
// Tested once, this tends to be close to zero when actually called.
rbBuffered = stretchIn - stretchOut;
if(rbBuffered < 0.0) {
rbBuffered = countIn - (double)(countOut);
if(rbBuffered < 0) {
rbBuffered = 0.0;
} else {
rbBuffered /= inputFormat.mSampleRate;
}
}
return [buffer listDuration] + rbBuffered;