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dummy: better clear buffer behavior

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See #3
This commit is contained in:
Andrew Kelley 2015-09-01 15:38:49 -07:00
parent cd72f45f06
commit c88e79cb7b
2 changed files with 16 additions and 2 deletions
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17
src/dummy.cpp
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@ -32,10 +32,20 @@ static void playback_thread_run(void *arg) {
ceil(time_passed / osd->period_duration) * osd->period_duration;
double relative_time = next_period - now;
soundio_os_cond_timed_wait(osd->cond, nullptr, relative_time);
if (!osd->clear_buffer_flag.test_and_set()) {
soundio_ring_buffer_clear(&osd->ring_buffer);
int free_bytes = soundio_ring_buffer_capacity(&osd->ring_buffer);
int free_frames = free_bytes / outstream->bytes_per_frame;
osd->frames_left = free_frames;
outstream->write_callback(outstream, 0, free_frames);
frames_consumed = 0;
start_time = soundio_os_get_time();
continue;
}
int fill_bytes = soundio_ring_buffer_fill_count(&osd->ring_buffer);
int free_bytes = soundio_ring_buffer_capacity(&osd->ring_buffer) - fill_bytes;
int fill_frames = fill_bytes / outstream->bytes_per_frame;
int free_bytes = soundio_ring_buffer_capacity(&osd->ring_buffer) - fill_bytes;
int free_frames = free_bytes / outstream->bytes_per_frame;
double total_time = soundio_os_get_time() - start_time;
@ -153,6 +163,8 @@ static int outstream_open_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate *os)
SoundIoOutStream *outstream = &os->pub;
SoundIoDevice *device = outstream->device;
osd->clear_buffer_flag.test_and_set();
if (outstream->software_latency == 0.0)
outstream->software_latency = clamp(device->software_latency_min, 1.0, device->software_latency_max);
@ -236,7 +248,8 @@ static int outstream_end_write_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate
static int outstream_clear_buffer_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoOutStreamDummy *osd = &os->backend_data.dummy;
soundio_ring_buffer_clear(&osd->ring_buffer);
osd->clear_buffer_flag.clear();
soundio_os_cond_signal(osd->cond, nullptr);
return 0;
}

1
src/dummy.hpp
View file

@ -33,6 +33,7 @@ struct SoundIoOutStreamDummy {
int write_frame_count;
struct SoundIoRingBuffer ring_buffer;
double playback_start_time;
atomic_flag clear_buffer_flag;
SoundIoChannelArea areas[SOUNDIO_MAX_CHANNELS];
};