libsoundio/example/microphone.c

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/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include <soundio.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
static enum SoundIoFormat prioritized_formats[] = {
SoundIoFormatFloat32NE,
SoundIoFormatFloat32FE,
SoundIoFormatS32NE,
SoundIoFormatS32FE,
SoundIoFormatS24NE,
SoundIoFormatS24FE,
SoundIoFormatS16NE,
SoundIoFormatS16FE,
SoundIoFormatFloat64NE,
SoundIoFormatFloat64FE,
SoundIoFormatU32NE,
SoundIoFormatU32FE,
SoundIoFormatU24NE,
SoundIoFormatU24FE,
SoundIoFormatU16NE,
SoundIoFormatU16FE,
SoundIoFormatS8,
SoundIoFormatU8,
SoundIoFormatInvalid,
};
__attribute__ ((cold))
__attribute__ ((noreturn))
__attribute__ ((format (printf, 1, 2)))
static void panic(const char *format, ...) {
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
fprintf(stderr, "\n");
va_end(ap);
abort();
}
static void read_callback(struct SoundIoInStream *instream) {
fprintf(stderr, "read_callback\n");
}
static void write_callback(struct SoundIoOutStream *outstream, int requested_frame_count) {
fprintf(stderr, "write_callback\n");
}
static void underrun_callback(struct SoundIoOutStream *outstream) {
static int count = 0;
fprintf(stderr, "underrun %d\n", count++);
soundio_outstream_fill_with_silence(outstream);
}
int main(int argc, char **argv) {
struct SoundIo *soundio = soundio_create();
if (!soundio)
panic("out of memory");
int err;
if ((err = soundio_connect(soundio)))
panic("error connecting: %s", soundio_strerror(err));
int default_out_device_index = soundio_get_default_output_device_index(soundio);
if (default_out_device_index < 0)
panic("no output device found");
int default_in_device_index = soundio_get_default_input_device_index(soundio);
if (default_in_device_index < 0)
panic("no output device found");
struct SoundIoDevice *out_device = soundio_get_output_device(soundio, default_out_device_index);
if (!out_device)
panic("could not get output device: out of memory");
struct SoundIoDevice *in_device = soundio_get_input_device(soundio, default_in_device_index);
if (!in_device)
panic("could not get input device: out of memory");
fprintf(stderr, "Input device: %s\n", in_device->description);
fprintf(stderr, "Output device: %s\n", out_device->description);
soundio_device_sort_channel_layouts(out_device);
const struct SoundIoChannelLayout *layout = soundio_best_matching_channel_layout(
out_device->layouts, out_device->layout_count,
in_device->layouts, in_device->layout_count);
if (!layout)
panic("channel layouts not compatible");
int sample_rate = 48000;
if (in_device->sample_rate_max < sample_rate) sample_rate = in_device->sample_rate_max;
if (out_device->sample_rate_max < sample_rate) sample_rate = out_device->sample_rate_max;
if (in_device->sample_rate_min > sample_rate || out_device->sample_rate_min > sample_rate)
panic("incompatible sample rates");
enum SoundIoFormat *fmt;
for (fmt = prioritized_formats; *fmt != SoundIoFormatInvalid; fmt += 1) {
if (soundio_device_supports_format(in_device, *fmt) &&
soundio_device_supports_format(out_device, *fmt))
{
break;
}
}
if (*fmt == SoundIoFormatInvalid)
panic("incompatible sample formats");
struct SoundIoInStream *instream = soundio_instream_create(in_device);
if (!instream)
panic("out of memory");
instream->format = *fmt;
instream->sample_rate = sample_rate;
instream->layout = *layout;
instream->latency = 0.1;
instream->read_callback = read_callback;
if ((err = soundio_instream_open(instream)))
panic("unable to open input stream: %s", soundio_strerror(err));
struct SoundIoOutStream *outstream = soundio_outstream_create(out_device);
if (!outstream)
panic("out of memory");
outstream->format = *fmt;
outstream->sample_rate = sample_rate;
outstream->layout = *layout;
outstream->latency = 0.1;
outstream->write_callback = write_callback;
outstream->underrun_callback = underrun_callback;
if ((err = soundio_outstream_open(outstream)))
panic("unable to open output stream: %s", soundio_strerror(err));
if ((err = soundio_instream_start(instream)))
panic("unable to start input device: %s", soundio_strerror(err));
if ((err = soundio_outstream_start(outstream)))
panic("unable to start output device: %s", soundio_strerror(err));
for (;;)
soundio_wait_events(soundio);
soundio_outstream_destroy(outstream);
soundio_instream_destroy(instream);
soundio_device_unref(in_device);
soundio_device_unref(out_device);
soundio_destroy(soundio);
return 0;
}