112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
#include <math.h>
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#include <util/bmem.h>
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#include <util/threading.h>
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#include <util/platform.h>
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#include <obs.h>
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struct sinewave_data {
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bool initialized_thread;
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pthread_t thread;
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os_event_t event;
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obs_source_t source;
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};
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/* middle C */
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static const double rate = 261.63/48000.0;
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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#define M_PI_X2 M_PI*2
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static void *sinewave_thread(void *pdata)
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{
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struct sinewave_data *swd = pdata;
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uint64_t last_time = os_gettime_ns();
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uint64_t ts = 0;
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double cos_val = 0.0;
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uint8_t bytes[480];
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while (os_event_try(swd->event) == EAGAIN) {
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if (!os_sleepto_ns(last_time += 10000000))
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last_time = os_gettime_ns();
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for (size_t i = 0; i < 480; i++) {
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cos_val += rate * M_PI_X2;
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if (cos_val > M_PI_X2)
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cos_val -= M_PI_X2;
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double wave = cos(cos_val) * 0.5;
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bytes[i] = (uint8_t)((wave+1.0)*0.5 * 255.0);
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}
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struct source_audio data;
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data.data[0] = bytes;
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data.frames = 480;
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data.speakers = SPEAKERS_MONO;
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data.samples_per_sec = 48000;
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data.timestamp = ts;
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data.format = AUDIO_FORMAT_U8BIT;
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obs_source_output_audio(swd->source, &data);
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ts += 10000000;
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}
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return NULL;
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}
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/* ------------------------------------------------------------------------- */
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static const char *sinewave_getname(const char *locale)
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{
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UNUSED_PARAMETER(locale);
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return "Sinewave Sound Source (Test)";
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}
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static void sinewave_destroy(void *data)
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{
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struct sinewave_data *swd = data;
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if (swd) {
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if (swd->initialized_thread) {
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void *ret;
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os_event_signal(swd->event);
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pthread_join(swd->thread, &ret);
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}
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os_event_destroy(swd->event);
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bfree(swd);
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}
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}
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static void *sinewave_create(obs_data_t settings,
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obs_source_t source)
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{
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struct sinewave_data *swd = bzalloc(sizeof(struct sinewave_data));
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swd->source = source;
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if (os_event_init(&swd->event, OS_EVENT_TYPE_MANUAL) != 0)
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goto fail;
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if (pthread_create(&swd->thread, NULL, sinewave_thread, swd) != 0)
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goto fail;
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swd->initialized_thread = true;
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UNUSED_PARAMETER(settings);
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return swd;
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fail:
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sinewave_destroy(swd);
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return NULL;
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}
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struct obs_source_info test_sinewave = {
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.id = "test_sinewave",
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.type = OBS_SOURCE_TYPE_INPUT,
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.output_flags = OBS_SOURCE_AUDIO,
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.getname = sinewave_getname,
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.create = sinewave_create,
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.destroy = sinewave_destroy,
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};
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