136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
#include <soundio/soundio.h>
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#include <iostream>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string>
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#include <math.h>
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#include <chrono>
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using namespace std;
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static const float PI = 3.1415926535f;
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static float seconds_offset = 0.0f;
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auto next_write = chrono::system_clock::now();
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static void write_callback(struct SoundIoOutStream *outstream,
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int frame_count_min, int frame_count_max)
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{
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const struct SoundIoChannelLayout *layout = &outstream->layout;
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float float_sample_rate = outstream->sample_rate;
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float seconds_per_frame = 1.0f / float_sample_rate;
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struct SoundIoChannelArea *areas;
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int frames_left = 960 ;
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int err;
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if(next_write > chrono::system_clock::now()) {
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return;
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}
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cout << frame_count_min << "/" << frame_count_max << endl;
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next_write = chrono::system_clock::now() + chrono::milliseconds{20};
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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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fprintf(stderr, "%s\n", soundio_strerror(err));
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exit(1);
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}
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if (!frame_count)
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break;
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float pitch = 440.0f;
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float radians_per_second = pitch * 2.0f * PI;
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for (int frame = 0; frame < frame_count; frame += 1) {
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float 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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float *ptr = (float*)(areas[channel].ptr + areas[channel].step * frame);
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*ptr = sample;
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}
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}
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seconds_offset = fmodf(seconds_offset +
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seconds_per_frame * frame_count, 1.0f);
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if ((err = soundio_outstream_end_write(outstream))) {
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fprintf(stderr, "%s\n", soundio_strerror(err));
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exit(1);
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}
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frames_left -= frame_count;
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}
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cout << "FLeft: " << frames_left << endl;
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}
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int main(int argc, char **argv) {
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int err;
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struct SoundIo *soundio = soundio_create();
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if (!soundio) {
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fprintf(stderr, "out of memory\n");
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return 1;
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}
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if ((err = soundio_connect(soundio))) {
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fprintf(stderr, "error connecting: %s", soundio_strerror(err));
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return 1;
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}
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soundio_flush_events(soundio);
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cout << "BCound: " << soundio_backend_count(soundio) << endl;
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for(int i = 0; i < soundio_backend_count(soundio); i++)
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cout << i << " => " << soundio_backend_name(soundio_get_backend(soundio, i)) << endl;
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for(int i = 0; i < soundio_input_device_count(soundio); i++) {
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auto dev = soundio_get_input_device(soundio, i);
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cout << dev->name << " - " << dev->id << endl;
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}
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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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fprintf(stderr, "no output device found");
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return 1;
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}
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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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fprintf(stderr, "out of memory");
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return 1;
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}
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fprintf(stderr, "Output device: %s\n", device->name);
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for(int i = 0; i < 1; i++) {
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struct SoundIoOutStream *outstream = soundio_outstream_create(device);
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outstream->format = SoundIoFormatFloat32LE;
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outstream->write_callback = write_callback;
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outstream->software_latency = 0.02;
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outstream->underflow_callback = [](auto ptr) {
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cout << "Underflow" << endl;
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};
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outstream->error_callback = [](auto ptr, auto code) {
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cout << "Error:" << code << endl;
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};
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if ((err = soundio_outstream_open(outstream))) {
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fprintf(stderr, "unable to open device: %s", soundio_strerror(err));
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return 1;
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}
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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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fprintf(stderr, "unable to start device: %s", soundio_strerror(err));
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return 1;
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}
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}
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for (;;)
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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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} |