mirror of
https://github.com/Ryujinx/libsoundio.git
synced 2024-12-22 23:25:34 +00:00
248 lines
8.6 KiB
C++
248 lines
8.6 KiB
C++
/*
|
|
* Copyright (c) 2015 Andrew Kelley
|
|
*
|
|
* This file is part of libsoundio, which is MIT licensed.
|
|
* See http://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
#include "soundio.hpp"
|
|
#include "os.h"
|
|
#include "util.hpp"
|
|
#include "atomics.hpp"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
static int usage(char *exe) {
|
|
fprintf(stderr, "Usage: %s [--backend dummy|alsa|pulseaudio|jack|coreaudio|wasapi]\n", exe);
|
|
return 1;
|
|
}
|
|
|
|
static void write_sample_s16ne(char *ptr, double sample) {
|
|
int16_t *buf = (int16_t *)ptr;
|
|
double range = (double)INT16_MAX - (double)INT16_MIN;
|
|
double val = sample * range / 2.0;
|
|
*buf = val;
|
|
}
|
|
|
|
static void write_sample_s32ne(char *ptr, double sample) {
|
|
int32_t *buf = (int32_t *)ptr;
|
|
double range = (double)INT32_MAX - (double)INT32_MIN;
|
|
double val = sample * range / 2.0;
|
|
*buf = val;
|
|
}
|
|
|
|
static void write_sample_float32ne(char *ptr, double sample) {
|
|
float *buf = (float *)ptr;
|
|
*buf = sample;
|
|
}
|
|
|
|
static void write_sample_float64ne(char *ptr, double sample) {
|
|
double *buf = (double *)ptr;
|
|
*buf = sample;
|
|
}
|
|
|
|
static void (*write_sample)(char *ptr, double sample);
|
|
|
|
static int frames_until_pulse = 0;
|
|
static int pulse_frames_left = -1;
|
|
static const double PI = 3.14159265358979323846264338328;
|
|
static double seconds_offset = 0.0;
|
|
|
|
static SoundIoRingBuffer pulse_rb;
|
|
|
|
static void write_time(SoundIoOutStream *outstream, double extra) {
|
|
double latency;
|
|
int err;
|
|
if ((err = soundio_outstream_get_latency(outstream, &latency))) {
|
|
soundio_panic("getting latency: %s", soundio_strerror(err));
|
|
}
|
|
double now = soundio_os_get_time();
|
|
double audible_time = now + latency + extra;
|
|
double *write_ptr = (double *)soundio_ring_buffer_write_ptr(&pulse_rb);
|
|
*write_ptr = audible_time;
|
|
soundio_ring_buffer_advance_write_ptr(&pulse_rb, sizeof(double));
|
|
}
|
|
|
|
static void write_callback(struct SoundIoOutStream *outstream, int frame_count_min, int frame_count_max) {
|
|
double float_sample_rate = outstream->sample_rate;
|
|
double seconds_per_frame = 1.0f / float_sample_rate;
|
|
struct SoundIoChannelArea *areas;
|
|
int err;
|
|
|
|
int frames_left = frame_count_max;
|
|
|
|
while (frames_left > 0) {
|
|
int frame_count = frames_left;
|
|
|
|
if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count)))
|
|
soundio_panic("begin write: %s", soundio_strerror(err));
|
|
|
|
if (!frame_count)
|
|
break;
|
|
|
|
const struct SoundIoChannelLayout *layout = &outstream->layout;
|
|
|
|
double pitch = 440.0;
|
|
double radians_per_second = pitch * 2.0 * PI;
|
|
for (int frame = 0; frame < frame_count; frame += 1) {
|
|
double sample;
|
|
if (frames_until_pulse <= 0) {
|
|
if (pulse_frames_left == -1) {
|
|
pulse_frames_left = 0.25 * float_sample_rate;
|
|
write_time(outstream, seconds_per_frame * frame); // announce beep start
|
|
}
|
|
if (pulse_frames_left > 0) {
|
|
pulse_frames_left -= 1;
|
|
sample = sinf((seconds_offset + frame * seconds_per_frame) * radians_per_second);
|
|
} else {
|
|
frames_until_pulse = (0.5 + (rand() / (double)RAND_MAX) * 2.0) * float_sample_rate;
|
|
pulse_frames_left = -1;
|
|
sample = 0.0;
|
|
write_time(outstream, seconds_per_frame * frame); // announce beep end
|
|
}
|
|
} else {
|
|
frames_until_pulse -= 1;
|
|
sample = 0.0;
|
|
}
|
|
for (int channel = 0; channel < layout->channel_count; channel += 1) {
|
|
write_sample(areas[channel].ptr, sample);
|
|
areas[channel].ptr += areas[channel].step;
|
|
}
|
|
}
|
|
|
|
seconds_offset += seconds_per_frame * frame_count;
|
|
|
|
if ((err = soundio_outstream_end_write(outstream)))
|
|
soundio_panic("end write: %s", soundio_strerror(err));
|
|
|
|
frames_left -= frame_count;
|
|
}
|
|
}
|
|
|
|
static void underflow_callback(struct SoundIoOutStream *outstream) {
|
|
soundio_panic("underflow\n");
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
char *exe = argv[0];
|
|
enum SoundIoBackend backend = SoundIoBackendNone;
|
|
for (int i = 1; i < argc; i += 1) {
|
|
char *arg = argv[i];
|
|
if (arg[0] == '-' && arg[1] == '-') {
|
|
i += 1;
|
|
if (i >= argc) {
|
|
return usage(exe);
|
|
} else if (strcmp(arg, "--backend") == 0) {
|
|
if (strcmp("dummy", argv[i]) == 0) {
|
|
backend = SoundIoBackendDummy;
|
|
} else if (strcmp("alsa", argv[i]) == 0) {
|
|
backend = SoundIoBackendAlsa;
|
|
} else if (strcmp("pulseaudio", argv[i]) == 0) {
|
|
backend = SoundIoBackendPulseAudio;
|
|
} else if (strcmp("jack", argv[i]) == 0) {
|
|
backend = SoundIoBackendJack;
|
|
} else if (strcmp("coreaudio", argv[i]) == 0) {
|
|
backend = SoundIoBackendCoreAudio;
|
|
} else if (strcmp("wasapi", argv[i]) == 0) {
|
|
backend = SoundIoBackendWasapi;
|
|
} else {
|
|
fprintf(stderr, "Invalid backend: %s\n", argv[i]);
|
|
return 1;
|
|
}
|
|
} else {
|
|
return usage(exe);
|
|
}
|
|
} else {
|
|
return usage(exe);
|
|
}
|
|
}
|
|
|
|
struct SoundIo *soundio;
|
|
if (!(soundio = soundio_create()))
|
|
soundio_panic("out of memory");
|
|
|
|
int err = (backend == SoundIoBackendNone) ?
|
|
soundio_connect(soundio) : soundio_connect_backend(soundio, backend);
|
|
|
|
if (err)
|
|
soundio_panic("error connecting: %s", soundio_strerror(err));
|
|
|
|
soundio_flush_events(soundio);
|
|
|
|
int default_out_device_index = soundio_default_output_device_index(soundio);
|
|
if (default_out_device_index < 0)
|
|
soundio_panic("no output device found");
|
|
|
|
struct SoundIoDevice *device = soundio_get_output_device(soundio, default_out_device_index);
|
|
if (!device)
|
|
soundio_panic("out of memory");
|
|
|
|
fprintf(stderr, "Output device: %s\n", device->name);
|
|
|
|
struct SoundIoOutStream *outstream = soundio_outstream_create(device);
|
|
outstream->format = SoundIoFormatFloat32NE;
|
|
outstream->write_callback = write_callback;
|
|
outstream->underflow_callback = underflow_callback;
|
|
|
|
if (soundio_device_supports_format(device, SoundIoFormatFloat32NE)) {
|
|
outstream->format = SoundIoFormatFloat32NE;
|
|
write_sample = write_sample_float32ne;
|
|
} else if (soundio_device_supports_format(device, SoundIoFormatFloat64NE)) {
|
|
outstream->format = SoundIoFormatFloat64NE;
|
|
write_sample = write_sample_float64ne;
|
|
} else if (soundio_device_supports_format(device, SoundIoFormatS32NE)) {
|
|
outstream->format = SoundIoFormatS32NE;
|
|
write_sample = write_sample_s32ne;
|
|
} else if (soundio_device_supports_format(device, SoundIoFormatS16NE)) {
|
|
outstream->format = SoundIoFormatS16NE;
|
|
write_sample = write_sample_s16ne;
|
|
} else {
|
|
soundio_panic("No suitable device format available.\n");
|
|
}
|
|
|
|
if ((err = soundio_ring_buffer_init(&pulse_rb, 1024)))
|
|
soundio_panic("ring buffer init: %s", soundio_strerror(err));
|
|
|
|
if ((err = soundio_outstream_open(outstream)))
|
|
soundio_panic("unable to open device: %s", soundio_strerror(err));
|
|
|
|
if (outstream->layout_error)
|
|
fprintf(stderr, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
|
|
|
|
if ((err = soundio_outstream_start(outstream)))
|
|
soundio_panic("unable to start device: %s", soundio_strerror(err));
|
|
|
|
bool beep_on = true;
|
|
int count = 0;
|
|
for (;;) {
|
|
int fill_count = soundio_ring_buffer_fill_count(&pulse_rb);
|
|
if (fill_count >= (int)sizeof(double)) {
|
|
double *read_ptr = (double *)soundio_ring_buffer_read_ptr(&pulse_rb);
|
|
double audible_time = *read_ptr;
|
|
while (audible_time > soundio_os_get_time()) {
|
|
// Burn the CPU while we wait for our precisely timed event.
|
|
}
|
|
if (beep_on) {
|
|
fprintf(stderr, "BEEP %d start\n", count);
|
|
} else {
|
|
fprintf(stderr, "BEEP %d end\n", count++);
|
|
}
|
|
fflush(stderr);
|
|
double off_by = soundio_os_get_time() - audible_time;
|
|
if (off_by > 0.0001)
|
|
fprintf(stderr, "off by %f\n", off_by);
|
|
beep_on = !beep_on;
|
|
soundio_ring_buffer_advance_read_ptr(&pulse_rb, sizeof(double));
|
|
}
|
|
}
|
|
|
|
soundio_outstream_destroy(outstream);
|
|
soundio_device_unref(device);
|
|
soundio_destroy(soundio);
|
|
return 0;
|
|
}
|
|
|