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AudioPulseAudio: fixed latency and underrun problems

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Try to adjust latency of PulseAudio according to our settings of mixer
so it does not have such a bad latency anymore.

Furthermore force PulseAudio to play silence instead of rewinding
streams in case of underruns.
This commit is contained in:
Armin Kazmi
2009-11-20 22:47:35 +01:00
committed by Tobias Doerffel
parent 168805745e
commit 92047f5e9e
1 changed files with 24 additions and 5 deletions
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29
src/core/audio/AudioPulseAudio.cpp
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@@ -35,6 +35,7 @@
#include "gui_templates.h"
#include "templates.h"
#include "Cpu.h"
#include "engine.h"
static void stream_write_callback(pa_stream *s, size_t length, void *userdata)
@@ -169,11 +170,29 @@ static void context_state_callback(pa_context *c, void *userdata)
_this->m_s = pa_stream_new( c, "lmms", &_this->m_sampleSpec, NULL);
pa_stream_set_state_callback( _this->m_s, stream_state_callback, _this );
pa_stream_set_write_callback( _this->m_s, stream_write_callback, _this );
pa_stream_connect_playback( _this->m_s, NULL, NULL,
(pa_stream_flags) 0,
pa_cvolume_set( &cv, _this->m_sampleSpec.channels,
PA_VOLUME_NORM ),
NULL );
pa_buffer_attr buffer_attr;
buffer_attr.maxlength = (uint32_t)(-1);
// play silence in case of buffer underun instead of using default rewind
buffer_attr.prebuf = 0;
buffer_attr.minreq = (uint32_t)(-1);
buffer_attr.fragsize = (uint32_t)(-1);
double latency = (double)( engine::getMixer()->framesPerPeriod() ) /
(double)_this->sampleRate();
// ask PulseAudio for the desired latency (which might not be approved)
buffer_attr.tlength = pa_usec_to_bytes( latency * PA_USEC_PER_MSEC,
&_this->m_sampleSpec );
pa_stream_connect_playback( _this->m_s, NULL, &buffer_attr,
PA_STREAM_ADJUST_LATENCY,
pa_cvolume_set( &cv, _this->m_sampleSpec.channels,
PA_VOLUME_NORM ),
NULL );
break;
}