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/***
This file is part of PulseAudio.
Copyright 2013 Collabora Ltd.
Author: Arun Raghavan <arun.raghavan@collabora.co.uk>
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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <check.h>
#include "lo-test-util.h"
#define SAMPLE_HZ 44100
#define CHANNELS 2
#define N_OUT (SAMPLE_HZ * 1)
static float out[N_OUT][CHANNELS];
pa_lo_test_context test_ctx;
static const char *context_name = NULL;
static struct timeval tv_out, tv_in;
static void nop_free_cb(void *p) {
}
static void write_cb(pa_stream *s, size_t nbytes, void *userdata) {
pa_lo_test_context *ctx = (pa_lo_test_context *) userdata;
static int ppos = 0;
int r, nsamp;
/* Get the real requested bytes since the last write might have been
* incomplete if it caused a wrap around */
nbytes = pa_stream_writable_size(s);
nsamp = nbytes / ctx->fs;
if (ppos + nsamp > N_OUT) {
/* Wrap-around, write to end and exit. Next iteration will fill up the
* rest */
nbytes = (N_OUT - ppos) * ctx->fs;
}
if (ppos == 0)
pa_gettimeofday(&tv_out);
r = pa_stream_write(s, &out[ppos][0], nbytes, nop_free_cb, 0, PA_SEEK_RELATIVE);
fail_unless(r == 0);
ppos = (ppos + nbytes / ctx->fs) % N_OUT;
}
#define WINDOW (2 * CHANNELS)
static void read_cb(pa_stream *s, size_t nbytes, void *userdata) {
pa_lo_test_context *ctx = (pa_lo_test_context *) userdata;
static float last = 0.0f;
const float *in;
float cur;
int r;
unsigned int i = 0;
size_t l;
r = pa_stream_peek(s, (const void **)&in, &l);
fail_unless(r == 0);
if (l == 0)
return;
#if 0
{
static int fd = -1;
if (fd == -1) {
fd = open("loopback.raw", O_CREAT | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR);
fail_if(fd < 0);
}
r = write(fd, in, l);
}
#endif
do {
#if 0
{
int j;
fprintf(stderr, "%g (", pa_rms(in, WINDOW));
for (j = 0; j < WINDOW; j++)
fprintf(stderr, "%g ", in[j]);
fprintf(stderr, ")\n");
}
#endif
if (i + (ctx->ss * WINDOW) < l)
cur = pa_rms(in, WINDOW);
else
cur = pa_rms(in, (l - i) / ctx->ss);
/* We leave the definition of 0 generous since the window might
* straddle the 0->1 transition, raising the average power. We keep the
* definition of 1 tight in this case and detect the transition in the
* next round. */
if (cur - last > 0.4f) {
pa_gettimeofday(&tv_in);
fprintf(stderr, "Latency %llu\n", (unsigned long long) pa_timeval_diff(&tv_in, &tv_out));
}
last = cur;
in += WINDOW;
i += ctx->ss * WINDOW;
} while (i + (ctx->ss * WINDOW) <= l);
pa_stream_drop(s);
}
START_TEST (loopback_test) {
int i, pulse_hz = SAMPLE_HZ / 1000;
test_ctx.context_name = context_name;
test_ctx.sample_spec.format = PA_SAMPLE_FLOAT32,
test_ctx.sample_spec.rate = SAMPLE_HZ,
test_ctx.sample_spec.channels = CHANNELS,
test_ctx.play_latency = 25;
test_ctx.rec_latency = 5;
test_ctx.read_cb = read_cb;
test_ctx.write_cb = write_cb;
/* Generate a square pulse */
for (i = 0; i < N_OUT; i++)
if (i < pulse_hz)
out[i][0] = out[i][1] = 1.0f;
else
out[i][0] = out[i][1] = 0.0f;
fail_unless(pa_lo_test_init(&test_ctx) == 0);
fail_unless(pa_lo_test_run(&test_ctx) == 0);
pa_lo_test_deinit(&test_ctx);
}
END_TEST
int main(int argc, char *argv[]) {
int failed = 0;
Suite *s;
TCase *tc;
SRunner *sr;
context_name = argv[0];
s = suite_create("Loopback latency");
tc = tcase_create("loopback latency");
tcase_add_test(tc, loopback_test);
suite_add_tcase(s, tc);
sr = srunner_create(s);
srunner_set_fork_status(sr, CK_NOFORK);
srunner_run_all(sr, CK_NORMAL);
failed = srunner_ntests_failed(sr);
srunner_free(sr);
return (failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}
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