110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
#include <math.h>
|
|
#include <util/bmem.h>
|
|
#include <util/threading.h>
|
|
#include <util/platform.h>
|
|
#include <obs.h>
|
|
|
|
struct sinewave_data {
|
|
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
|
|
|
|
static void *sinewave_thread(void *pdata)
|
|
{
|
|
struct sinewave_data *swd = pdata;
|
|
uint64_t last_time = os_gettime_ns();
|
|
uint64_t ts = 0;
|
|
double cos_val = 0.0;
|
|
uint8_t bytes[480];
|
|
|
|
while (os_event_try(swd->event) == EAGAIN) {
|
|
if (!os_sleepto_ns(last_time += 10000000))
|
|
last_time = os_gettime_ns();
|
|
|
|
for (size_t i = 0; i < 480; i++) {
|
|
cos_val += rate * M_PI_X2;
|
|
if (cos_val > M_PI_X2)
|
|
cos_val -= M_PI_X2;
|
|
|
|
double wave = cos(cos_val) * 0.5;
|
|
bytes[i] = (uint8_t)((wave+1.0)*0.5 * 255.0);
|
|
}
|
|
|
|
struct obs_source_audio data;
|
|
data.data[0] = bytes;
|
|
data.frames = 480;
|
|
data.speakers = SPEAKERS_MONO;
|
|
data.samples_per_sec = 48000;
|
|
data.timestamp = ts;
|
|
data.format = AUDIO_FORMAT_U8BIT;
|
|
obs_source_output_audio(swd->source, &data);
|
|
|
|
ts += 10000000;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static const char *sinewave_getname(void)
|
|
{
|
|
return "Sinewave Sound Source (Test)";
|
|
}
|
|
|
|
static void sinewave_destroy(void *data)
|
|
{
|
|
struct sinewave_data *swd = data;
|
|
|
|
if (swd) {
|
|
if (swd->initialized_thread) {
|
|
void *ret;
|
|
os_event_signal(swd->event);
|
|
pthread_join(swd->thread, &ret);
|
|
}
|
|
|
|
os_event_destroy(swd->event);
|
|
bfree(swd);
|
|
}
|
|
}
|
|
|
|
static void *sinewave_create(obs_data_t *settings,
|
|
obs_source_t *source)
|
|
{
|
|
struct sinewave_data *swd = bzalloc(sizeof(struct sinewave_data));
|
|
swd->source = source;
|
|
|
|
if (os_event_init(&swd->event, OS_EVENT_TYPE_MANUAL) != 0)
|
|
goto fail;
|
|
if (pthread_create(&swd->thread, NULL, sinewave_thread, swd) != 0)
|
|
goto fail;
|
|
|
|
swd->initialized_thread = true;
|
|
|
|
UNUSED_PARAMETER(settings);
|
|
return swd;
|
|
|
|
fail:
|
|
sinewave_destroy(swd);
|
|
return NULL;
|
|
}
|
|
|
|
struct obs_source_info test_sinewave = {
|
|
.id = "test_sinewave",
|
|
.type = OBS_SOURCE_TYPE_INPUT,
|
|
.output_flags = OBS_SOURCE_AUDIO,
|
|
.get_name = sinewave_getname,
|
|
.create = sinewave_create,
|
|
.destroy = sinewave_destroy,
|
|
};
|