138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
#include <math.h>
|
|
#include <util/bmem.h>
|
|
#include <util/threading.h>
|
|
#include <util/platform.h>
|
|
#include <util/util_uint64.h>
|
|
#include <obs.h>
|
|
|
|
struct sync_pair_aud {
|
|
bool initialized_thread;
|
|
pthread_t thread;
|
|
os_event_t *event;
|
|
obs_source_t *source;
|
|
};
|
|
|
|
/* middle C */
|
|
static const double rate = 261.63 / 48000.0;
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.1415926535897932384626433832795
|
|
#endif
|
|
|
|
#define M_PI_X2 M_PI * 2
|
|
|
|
extern uint64_t starting_time;
|
|
|
|
static inline bool whitelist_time(uint64_t ts, uint64_t interval,
|
|
uint64_t fps_num, uint64_t fps_den)
|
|
{
|
|
if (!starting_time)
|
|
return false;
|
|
|
|
uint64_t count = (ts - starting_time) / interval;
|
|
uint64_t sec = count * fps_den / fps_num;
|
|
return sec % 2 == 1;
|
|
}
|
|
|
|
static void *sync_pair_aud_thread(void *pdata)
|
|
{
|
|
struct sync_pair_aud *spa = pdata;
|
|
uint32_t sample_rate = audio_output_get_sample_rate(obs_get_audio());
|
|
uint32_t frames = sample_rate / 100;
|
|
uint64_t last_time = obs_get_video_frame_time();
|
|
double cos_val = 0.0;
|
|
float *samples = malloc(frames * sizeof(float));
|
|
|
|
uint64_t interval = video_output_get_frame_time(obs_get_video());
|
|
const struct video_output_info *voi =
|
|
video_output_get_info(obs_get_video());
|
|
uint64_t fps_num = voi->fps_num;
|
|
uint64_t fps_den = voi->fps_den;
|
|
|
|
while (os_event_try(spa->event) == EAGAIN) {
|
|
if (!os_sleepto_ns(last_time += 10000000))
|
|
last_time = obs_get_video_frame_time();
|
|
|
|
for (uint64_t i = 0; i < frames; i++) {
|
|
uint64_t ts =
|
|
last_time +
|
|
util_mul_div64(i, 1000000000ULL, sample_rate);
|
|
|
|
if (whitelist_time(ts, interval, fps_num, fps_den)) {
|
|
cos_val += rate * M_PI_X2;
|
|
if (cos_val > M_PI_X2)
|
|
cos_val -= M_PI_X2;
|
|
|
|
samples[i] = (float)(cos(cos_val) * 0.5);
|
|
} else {
|
|
samples[i] = 0.0f;
|
|
}
|
|
}
|
|
|
|
struct obs_source_audio data;
|
|
data.data[0] = (uint8_t *)samples;
|
|
data.frames = frames;
|
|
data.speakers = SPEAKERS_MONO;
|
|
data.samples_per_sec = sample_rate;
|
|
data.timestamp = last_time;
|
|
data.format = AUDIO_FORMAT_FLOAT;
|
|
obs_source_output_audio(spa->source, &data);
|
|
}
|
|
|
|
free(samples);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static const char *sync_pair_aud_getname(void *unused)
|
|
{
|
|
UNUSED_PARAMETER(unused);
|
|
return "Sync Test Pair (Audio)";
|
|
}
|
|
|
|
static void sync_pair_aud_destroy(void *data)
|
|
{
|
|
struct sync_pair_aud *spa = data;
|
|
|
|
if (spa) {
|
|
if (spa->initialized_thread) {
|
|
void *ret;
|
|
os_event_signal(spa->event);
|
|
pthread_join(spa->thread, &ret);
|
|
}
|
|
|
|
os_event_destroy(spa->event);
|
|
bfree(spa);
|
|
}
|
|
}
|
|
|
|
static void *sync_pair_aud_create(obs_data_t *settings, obs_source_t *source)
|
|
{
|
|
struct sync_pair_aud *spa = bzalloc(sizeof(struct sync_pair_aud));
|
|
spa->source = source;
|
|
|
|
if (os_event_init(&spa->event, OS_EVENT_TYPE_MANUAL) != 0)
|
|
goto fail;
|
|
if (pthread_create(&spa->thread, NULL, sync_pair_aud_thread, spa) != 0)
|
|
goto fail;
|
|
|
|
spa->initialized_thread = true;
|
|
|
|
UNUSED_PARAMETER(settings);
|
|
return spa;
|
|
|
|
fail:
|
|
sync_pair_aud_destroy(spa);
|
|
return NULL;
|
|
}
|
|
|
|
struct obs_source_info sync_audio = {
|
|
.id = "sync_audio",
|
|
.type = OBS_SOURCE_TYPE_INPUT,
|
|
.output_flags = OBS_SOURCE_AUDIO,
|
|
.get_name = sync_pair_aud_getname,
|
|
.create = sync_pair_aud_create,
|
|
.destroy = sync_pair_aud_destroy,
|
|
};
|