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Core/AudioCommon: Feed bigger audio chunks to the output devices in case of underrun.

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This should eliminate the crackling with alsa and pulseaudio backends and replace it
with much nicer pauses. This is only interesting for audio backends that do not
respect Mixer::GetNumSamples() and should not impact users able to run the DSPLLE at
full speed.

The cost of this is an added LLE audio latency of about 0.06 s in the continuous
playback case. If that is too much, lower the low watermark.


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6239 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
pierre
2010-09-28 21:43:38 +00:00
parent 7eb99b9088
commit ce1057f17d
2 changed files with 30 additions and 12 deletions
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39
Source/Core/AudioCommon/Src/Mixer.cpp
View File

@ -37,19 +37,30 @@ unsigned int CMixer::Mix(short* samples, unsigned int numSamples)
}
unsigned int numLeft = Common::AtomicLoad(m_numSamples);
numLeft = (numLeft > numSamples) ? numSamples : numLeft;
// Do re-sampling if needed
if (m_sampleRate == 32000)
{
for (unsigned int i = 0; i < numLeft * 2; i++)
samples[i] = Common::swap16(m_buffer[(m_indexR + i) & INDEX_MASK]);
m_indexR += numLeft * 2;
if (m_LLEplaying) {
if (numLeft < numSamples)//cannot do much about this
m_LLEplaying = false;
if (numLeft < MAX_SAMPLES/4)//low watermark
m_LLEplaying = false;
} else {
if (numLeft > MAX_SAMPLES/2)//high watermark
m_LLEplaying = true;
}
else
{
// AyuanX: Up-sampling is not implemented yet
PanicAlert("Mixer: Up-sampling is not implemented yet!");
if (m_LLEplaying) {
numLeft = (numLeft > numSamples) ? numSamples : numLeft;
// Do re-sampling if needed
if (m_sampleRate == 32000)
{
for (unsigned int i = 0; i < numLeft * 2; i++)
samples[i] = Common::swap16(m_buffer[(m_indexR + i) & INDEX_MASK]);
m_indexR += numLeft * 2;
}
else
{
// AyuanX: Up-sampling is not implemented yet
PanicAlert("Mixer: Up-sampling is not implemented yet!");
/*
static int PV1l=0,PV2l=0,PV3l=0,PV4l=0;
static int PV1r=0,PV2r=0,PV3r=0,PV4r=0;
@ -112,6 +123,10 @@ unsigned int CMixer::Mix(short* samples, unsigned int numSamples)
m_queueSize += 2;
}
*/
}
} else {
numLeft = 0;
}
// Padding