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dummy: implement pause/resume and improve period timing

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Andrew Kelley 2015-07-20 13:16:52 -07:00
parent 96c8332246
commit 71a365ca1b
2 changed files with 33 additions and 15 deletions
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1
README.md
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@ -258,6 +258,7 @@ view `coverage/index.html` in a browser.
specify how much to peek() and if you don't peek all of it, save the
unused to a buffer for you.
0. add len arguments to APIs that have char *
0. custom allocator support
## Planned Uses for libsoundio

47
src/dummy.cpp
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@ -13,6 +13,7 @@
#include <stdio.h>
#include <string.h>
#include <math.h>
struct SoundIoOutStreamDummy {
struct SoundIoOsThread *thread;
@ -42,9 +43,8 @@ static void playback_thread_run(void *arg) {
long frames_consumed = 0;
double time_per_frame = 1.0 / (double)outstream->sample_rate;
while (osd->abort_flag.test_and_set()) {
soundio_os_cond_timed_wait(osd->cond, nullptr, outstream->period_duration);
while (osd->abort_flag.test_and_set()) {
double now = soundio_os_get_time();
double total_time = now - start_time;
long total_frames = total_time / time_per_frame;
@ -62,6 +62,12 @@ static void playback_thread_run(void *arg) {
} else if (read_count > 0) {
outstream->write_callback(outstream, read_count);
}
now = soundio_os_get_time();
double time_passed = now - start_time;
double next_period = start_time +
ceil(time_passed / outstream->period_duration) * outstream->period_duration;
double relative_time = next_period - now;
soundio_os_cond_timed_wait(osd->cond, nullptr, relative_time);
}
}
@ -151,23 +157,38 @@ static int outstream_open_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate *os)
return 0;
}
static int outstream_start_dummy(SoundIoPrivate *soundio, SoundIoOutStreamPrivate *os) {
static int outstream_pause_dummy(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os, bool pause) {
SoundIoOutStreamDummy *osd = (SoundIoOutStreamDummy *)os->backend_data;
if (pause) {
if (osd->thread) {
osd->abort_flag.clear();
soundio_os_cond_signal(osd->cond, nullptr);
soundio_os_thread_destroy(osd->thread);
osd->thread = nullptr;
}
} else {
if (!osd->thread) {
osd->abort_flag.test_and_set();
int err;
if ((err = soundio_os_thread_create(playback_thread_run, os, true, &osd->thread))) {
return err;
}
}
}
return 0;
}
static int outstream_start_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoOutStream *outstream = &os->pub;
SoundIoOutStreamDummy *osd = (SoundIoOutStreamDummy *)os->backend_data;
soundio_outstream_fill_with_silence(outstream);
assert(soundio_ring_buffer_fill_count(&osd->ring_buffer) == osd->buffer_size);
osd->abort_flag.test_and_set();
int err;
if ((err = soundio_os_thread_create(playback_thread_run, os, true, &osd->thread))) {
return err;
return outstream_pause_dummy(si, os, false);
}
return 0;
}
static int outstream_free_count_dummy(SoundIoPrivate *soundio, SoundIoOutStreamPrivate *os) {
static int outstream_free_count_dummy(SoundIoPrivate *si, SoundIoOutStreamPrivate *os) {
SoundIoOutStream *outstream = &os->pub;
SoundIoOutStreamDummy *osd = (SoundIoOutStreamDummy *)os->backend_data;
int fill_count = soundio_ring_buffer_fill_count(&osd->ring_buffer);
@ -214,10 +235,6 @@ static void outstream_clear_buffer_dummy(SoundIoPrivate *si, SoundIoOutStreamPri
soundio_ring_buffer_clear(&osd->ring_buffer);
}
static int outstream_pause_dummy(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os, bool pause) {
soundio_panic("TODO");
}
static int instream_open_dummy(SoundIoPrivate *si, SoundIoInStreamPrivate *is) {
soundio_panic("TODO");
}