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PulseAudio: better clear buffer implementation

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seek instead of pa_stream_flush
This commit is contained in:
Andrew Kelley 2015-09-07 16:58:46 -07:00
parent e2e483a4d5
commit 749654b922
2 changed files with 7 additions and 11 deletions
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17
src/pulseaudio.cpp
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@ -664,6 +664,7 @@ static int outstream_open_pa(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoPulseAudio *sipa = &si->backend_data.pulseaudio;
ospa->stream_ready.store(false);
ospa->clear_buffer_flag.test_and_set();
assert(sipa->pulse_context);
@ -779,8 +780,11 @@ static int outstream_begin_write_pa(SoundIoPrivate *si,
static int outstream_end_write_pa(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoOutStreamPulseAudio *ospa = &os->backend_data.pulseaudio;
pa_stream *stream = ospa->stream;
if (pa_stream_write(stream, ospa->write_ptr, ospa->write_byte_count, nullptr, 0, PA_SEEK_RELATIVE))
pa_seek_mode_t seek_mode = ospa->clear_buffer_flag.test_and_set() ? PA_SEEK_RELATIVE : PA_SEEK_RELATIVE_ON_READ;
if (pa_stream_write(stream, ospa->write_ptr, ospa->write_byte_count, nullptr, 0, seek_mode))
return SoundIoErrorStreaming;
return 0;
}
@ -788,16 +792,7 @@ static int outstream_clear_buffer_pa(SoundIoPrivate *si,
SoundIoOutStreamPrivate *os)
{
SoundIoOutStreamPulseAudio *ospa = &os->backend_data.pulseaudio;
SoundIoPulseAudio *sipa = &si->backend_data.pulseaudio;
pa_stream *stream = ospa->stream;
pa_threaded_mainloop_lock(sipa->main_loop);
pa_operation *op = pa_stream_flush(stream, NULL, NULL);
if (!op) {
pa_threaded_mainloop_unlock(sipa->main_loop);
return SoundIoErrorStreaming;
}
pa_operation_unref(op);
pa_threaded_mainloop_unlock(sipa->main_loop);
ospa->clear_buffer_flag.clear();
return 0;
}

1
src/pulseaudio.hpp
View file

@ -45,6 +45,7 @@ struct SoundIoOutStreamPulseAudio {
pa_buffer_attr buffer_attr;
char *write_ptr;
size_t write_byte_count;
atomic_flag clear_buffer_flag;
SoundIoChannelArea areas[SOUNDIO_MAX_CHANNELS];
};