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