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FreeBSD: Override UpdateLatencies() to fit OSS latencies. 

Reduce the base latencies for capture and playback by half a period,
and let the update method account for the additional playback latency
introduced by OSS buffer management.
This fits actual OSS latencies better, so the same settings for the
extra input-latency and output-latency parameters should apply to
different period lengths.

Beware that this change invalidates current input-latency and
output-latency values, they have to be measured again.
This commit is contained in:
Florian Walpen 2022-05-30 00:59:30 +02:00
parent c699e0cfe0
commit 819f46147e
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GPG Key ID: E11C40B3BC8863BC
2 changed files with 29 additions and 13 deletions
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36
freebsd/oss/JackOSSDriver.cpp
View File

@ -868,12 +868,7 @@ int JackOSSDriver::Open(jack_nframes_t nframes,
fIgnoreHW = ignorehwbuf;
fNperiods = user_nperiods;
fExcl = excl;
fExtraCaptureLatency = capture_latency;
fExtraPlaybackLatency = playback_latency;
// Additional playback latency introduced by the OSS buffer. The extra hardware
// latency given by the user should then be symmetric as reported by jack_iodelay.
playback_latency += user_nperiods * nframes;
// Generic JackAudioDriver Open
if (JackAudioDriver::Open(nframes, samplerate, capturing, playing, inchannels, outchannels, monitor,
capture_driver_uid, playback_driver_uid, capture_latency, playback_latency) != 0) {
@ -1237,14 +1232,35 @@ int JackOSSDriver::Write()
return 0;
}
void JackOSSDriver::UpdateLatencies()
{
// Reimplement from JackAudioDriver. Base latency is smaller, and there's
// additional latency due to OSS playback buffer management.
jack_latency_range_t input_range;
jack_latency_range_t output_range;
for (int i = 0; i < fCaptureChannels; i++) {
input_range.max = input_range.min = (fEngineControl->fBufferSize / 2) + fCaptureLatency;
fGraphManager->GetPort(fCapturePortList[i])->SetLatencyRange(JackCaptureLatency, &input_range);
}
for (int i = 0; i < fPlaybackChannels; i++) {
output_range.max = (fEngineControl->fBufferSize / 2) + fPlaybackLatency;
// Additional latency introduced by the OSS buffer.
output_range.max += fNperiods * fEngineControl->fBufferSize;
// Plus one period if in async mode.
if (!fEngineControl->fSyncMode) {
output_range.max += fEngineControl->fBufferSize;
}
output_range.min = output_range.max;
fGraphManager->GetPort(fPlaybackPortList[i])->SetLatencyRange(JackPlaybackLatency, &output_range);
}
}
int JackOSSDriver::SetBufferSize(jack_nframes_t buffer_size)
{
// Close and reopen device, we have to adjust the OSS buffer management.
CloseAux();
// Additional latency introduced by the OSS buffer, depends on buffer size.
fCaptureLatency = fExtraCaptureLatency;
fPlaybackLatency = fExtraPlaybackLatency + fNperiods * buffer_size;
JackAudioDriver::SetBufferSize(buffer_size); // Generic change, never fails
return OpenAux();
}

6
freebsd/oss/JackOSSDriver.h
View File

@ -53,8 +53,6 @@ class JackOSSDriver : public JackAudioDriver
bool fPlayback;
bool fExcl;
bool fIgnoreHW;
jack_nframes_t fExtraCaptureLatency;
jack_nframes_t fExtraPlaybackLatency;
unsigned int fInSampleSize;
unsigned int fOutSampleSize;
@ -93,13 +91,15 @@ class JackOSSDriver : public JackAudioDriver
int WriteSilence(jack_nframes_t frames);
int WaitAndSync();
protected:
virtual void UpdateLatencies();
public:
JackOSSDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
: JackAudioDriver(name, alias, engine, table),
fInFD(-1), fOutFD(-1), fBits(0),
fNperiods(0), fCapture(false), fPlayback(false), fExcl(false), fIgnoreHW(true),
fExtraCaptureLatency(0), fExtraPlaybackLatency(0),
fInSampleSize(0), fOutSampleSize(0),
fInputBufferSize(0), fOutputBufferSize(0),
fInputBuffer(NULL), fOutputBuffer(NULL),