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/***
This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <pulse/simple.h>
#include <pulse/error.h>
#define BUFSIZE 1024
int main(int argc, char*argv[]) {
/* The sample type to use */
static const pa_sample_spec ss = {
.format = PA_SAMPLE_S16LE,
.rate = 4000, /* Requesting 8000 crashes pulseaudio */
.channels = 1
};
static const pa_buffer_attr attr = {
.fragsize = (uint32_t) 1024,
.maxlength = (uint32_t) -1,
.minreq = (uint32_t) 1024,
.prebuf = (uint32_t) -1,
.tlength = (uint32_t) 1024,
/* fragsize / tlength can be 4096 -> pulseaudio CPU drops from 33% CPU to 10%, but latency can be heard */
};
pa_simple *r = NULL;
pa_simple *p = NULL;
int ret = 1;
int error;
const pa_buffer_attr *p_attr = &attr;
int opt = 0; // | PA_STREAM_ADJUST_LATENCY
/* Create a new playback stream */
if (!(p = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK | opt, NULL, "playback", &ss, NULL, p_attr, &error))) {
fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n", pa_strerror(error));
goto finish;
}
/* Create the recording stream */
if (!(r = pa_simple_new(NULL, argv[0], PA_STREAM_RECORD | opt, NULL, "record", &ss, NULL, p_attr, &error))) {
fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n", pa_strerror(error));
goto finish;
}
for (;;) {
uint8_t buf[BUFSIZE];
/* Record some data ... */
if (pa_simple_read(r, buf, sizeof(buf), &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_read() failed: %s\n", pa_strerror(error));
goto finish;
}
/* ... and play it */
if (pa_simple_write(p, buf, sizeof(buf), &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n", pa_strerror(error));
goto finish;
}
{
pa_usec_t latency_p, latency_r;
static pa_usec_t latency_p_avg, latency_r_avg;
static int every;
if ((latency_p = pa_simple_get_latency(p, &error)) == (pa_usec_t) -1) {
fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s\n", pa_strerror(error));
goto finish;
}
if ((latency_r = pa_simple_get_latency(r, &error)) == (pa_usec_t) -1) {
fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s\n", pa_strerror(error));
goto finish;
}
latency_p /= 1000.;
latency_r /= 1000.;
float factor = 0.01;
latency_p_avg = (latency_p_avg * (1 - factor)) + latency_p * factor;
latency_r_avg = (latency_r_avg * (1 - factor)) + latency_r * factor;
every++;
if (every == 1000) {
fprintf(stderr, "\rplayback %7.2f msec avg %6.1f, record %7.2f msec avg %6.1f ",
(float)latency_p, (float)latency_p_avg, (float)latency_r, (float)latency_r_avg);
every = 0;
}
if (latency_r > 3330000) {
fprintf(stderr, "...flush\n");
#if 0
if (pa_simple_flush(r, &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_flush() failed: %s\n", pa_strerror(error));
goto finish;
}
#endif
}
}
}
/* Make sure that every single sample was played */
if (pa_simple_drain(p, &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n", pa_strerror(error));
goto finish;
}
ret = 0;
finish:
if (r)
pa_simple_free(r);
if (p)
pa_simple_free(p);
return ret;
}
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