mirror of
https://github.com/dingusdev/dingusppc.git
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252 lines
8.3 KiB
C
252 lines
8.3 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/soundio.h>
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#include <stdio.h>
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#include <stdarg.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 <unistd.h>
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#include <stdint.h>
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__attribute__ ((cold))
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__attribute__ ((noreturn))
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__attribute__ ((format (printf, 1, 2)))
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static void panic(const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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abort();
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}
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static int usage(char *exe) {
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fprintf(stderr, "Usage: %s [options]\n"
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"Options:\n"
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" [--backend dummy|alsa|pulseaudio|jack|coreaudio|wasapi]\n"
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" [--device id]\n"
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" [--raw]\n"
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" [--sample-rate hz]\n"
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, 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 const double PI = 3.14159265358979323846264338328;
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static double seconds_offset = 0.0;
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static bool caused_underflow = false;
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static struct SoundIo *soundio = NULL;
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static double seconds_end = 9.0f;
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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 = 1.0 / float_sample_rate;
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struct SoundIoChannelArea *areas;
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int err;
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if (!caused_underflow && seconds_offset >= 3.0) {
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caused_underflow = true;
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sleep(3);
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}
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if (seconds_offset >= seconds_end) {
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soundio_wakeup(soundio);
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return;
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}
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int frames_left = frame_count_max;
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for (;;) {
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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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panic("%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 = sinf((seconds_offset + frame * seconds_per_frame) * radians_per_second);
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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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if (err == SoundIoErrorUnderflow)
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return;
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panic("%s", soundio_strerror(err));
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}
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frames_left -= frame_count;
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if (frames_left <= 0)
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break;
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}
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}
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static void underflow_callback(struct SoundIoOutStream *outstream) {
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static int count = 0;
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fprintf(stderr, "underflow %d\n", count++);
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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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char *device_id = NULL;
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bool raw = false;
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int sample_rate = 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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if (strcmp(arg, "--raw") == 0) {
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raw = true;
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} else {
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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(argv[i], "dummy") == 0) {
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backend = SoundIoBackendDummy;
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} else if (strcmp(argv[i], "alsa") == 0) {
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backend = SoundIoBackendAlsa;
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} else if (strcmp(argv[i], "pulseaudio") == 0) {
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backend = SoundIoBackendPulseAudio;
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} else if (strcmp(argv[i], "jack") == 0) {
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backend = SoundIoBackendJack;
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} else if (strcmp(argv[i], "coreaudio") == 0) {
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backend = SoundIoBackendCoreAudio;
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} else if (strcmp(argv[i], "wasapi") == 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, "--device") == 0) {
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device_id = argv[i];
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} else if (strcmp(arg, "--sample-rate") == 0) {
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sample_rate = atoi(argv[i]);
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} else {
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return usage(exe);
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}
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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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fprintf(stderr, "You should hear a sine wave for 3 seconds, then some period of silence or glitches,\n"
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"then you should see at least one buffer underflow message, then hear a sine\n"
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"wave for 3 seconds, then the program should exit successfully.\n"
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"WASAPI does not report buffer underflows.\n");
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if (!(soundio = soundio_create()))
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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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panic("error connecting: %s", soundio_strerror(err));
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soundio_flush_events(soundio);
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int selected_device_index = -1;
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if (device_id) {
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int device_count = soundio_output_device_count(soundio);
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for (int i = 0; i < device_count; i += 1) {
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struct SoundIoDevice *device = soundio_get_output_device(soundio, i);
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if (strcmp(device->id, device_id) == 0 && device->is_raw == raw) {
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selected_device_index = i;
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break;
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}
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}
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} else {
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selected_device_index = soundio_default_output_device_index(soundio);
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}
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if (selected_device_index < 0)
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panic("Output device not found");
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struct SoundIoDevice *device = soundio_get_output_device(soundio, selected_device_index);
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if (!device)
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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->sample_rate = sample_rate;
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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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fprintf(stderr, "No suitable device format available.\n");
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return 1;
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}
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if ((err = soundio_outstream_open(outstream)))
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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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panic("unable to start device: %s", soundio_strerror(err));
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while (seconds_offset < seconds_end)
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soundio_wait_events(soundio);
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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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