obs-studio/test/test-input/sync-pair-aud.c

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3.1 KiB
C
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#include <math.h>
#include <util/bmem.h>
#include <util/threading.h>
#include <util/platform.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 + 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,
};