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/* $Id$ */
/***
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 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <math.h>
#include <pulse/pulseaudio.h>
#include <pulse/mainloop.h>
#define NSTREAMS 4
#define SINE_HZ 440
#define SAMPLE_HZ 8000
static pa_context *context = NULL;
static pa_stream *streams[NSTREAMS];
static pa_mainloop_api *mainloop_api = NULL;
static float data[SAMPLE_HZ]; /* one second space */
static int n_streams_ready = 0;
static const pa_sample_spec sample_spec = {
.format = PA_SAMPLE_FLOAT32,
.rate = SAMPLE_HZ,
.channels = 1
};
static const pa_buffer_attr buffer_attr = {
.maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
.tlength = 0,
.prebuf = 0, /* Setting prebuf to 0 guarantees us the the streams will run synchronously, no matter what */
.minreq = 0
};
static void nop_free_cb(void *p) {}
static void underflow_cb(struct pa_stream *s, void *userdata) {
int i = (int) (long) userdata;
fprintf(stderr, "Stream %i finished\n", i);
if (++n_streams_ready >= 2*NSTREAMS) {
fprintf(stderr, "We're done\n");
mainloop_api->quit(mainloop_api, 0);
}
}
/* This routine is called whenever the stream state changes */
static void stream_state_callback(pa_stream *s, void *userdata) {
assert(s);
switch (pa_stream_get_state(s)) {
case PA_STREAM_UNCONNECTED:
case PA_STREAM_CREATING:
case PA_STREAM_TERMINATED:
break;
case PA_STREAM_READY: {
int r, i = (int) (long) userdata;
fprintf(stderr, "Writing data to stream %i.\n", i);
r = pa_stream_write(s, data, sizeof(data), nop_free_cb, sizeof(data) * i, PA_SEEK_ABSOLUTE);
assert(r == 0);
/* Be notified when this stream is drained */
pa_stream_set_underflow_callback(s, underflow_cb, userdata);
/* All streams have been set up, let's go! */
if (++n_streams_ready >= NSTREAMS) {
fprintf(stderr, "Uncorking\n");
pa_operation_unref(pa_stream_cork(s, 0, NULL, NULL));
}
break;
}
default:
case PA_STREAM_FAILED:
fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
abort();
}
}
/* This is called whenever the context status changes */
static void context_state_callback(pa_context *c, void *userdata) {
assert(c);
switch (pa_context_get_state(c)) {
case PA_CONTEXT_CONNECTING:
case PA_CONTEXT_AUTHORIZING:
case PA_CONTEXT_SETTING_NAME:
break;
case PA_CONTEXT_READY: {
int i;
fprintf(stderr, "Connection established.\n");
for (i = 0; i < NSTREAMS; i++) {
char name[64];
fprintf(stderr, "Creating stream %i\n", i);
snprintf(name, sizeof(name), "stream #%i", i);
streams[i] = pa_stream_new(c, name, &sample_spec, NULL);
assert(streams[i]);
pa_stream_set_state_callback(streams[i], stream_state_callback, (void*) (long) i);
pa_stream_connect_playback(streams[i], NULL, &buffer_attr, PA_STREAM_START_CORKED, NULL, i == 0 ? NULL : streams[0]);
}
break;
}
case PA_CONTEXT_TERMINATED:
mainloop_api->quit(mainloop_api, 0);
break;
case PA_CONTEXT_FAILED:
default:
fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
abort();
}
}
int main(int argc, char *argv[]) {
pa_mainloop* m = NULL;
int i, ret = 0;
for (i = 0; i < SAMPLE_HZ; i++)
data[i] = (float) sin(((double) i/SAMPLE_HZ)*2*M_PI*SINE_HZ)/2;
for (i = 0; i < NSTREAMS; i++)
streams[i] = NULL;
/* Set up a new main loop */
m = pa_mainloop_new();
assert(m);
mainloop_api = pa_mainloop_get_api(m);
context = pa_context_new(mainloop_api, argv[0]);
assert(context);
pa_context_set_state_callback(context, context_state_callback, NULL);
pa_context_connect(context, NULL, 0, NULL);
if (pa_mainloop_run(m, &ret) < 0)
fprintf(stderr, "pa_mainloop_run() failed.\n");
pa_context_unref(context);
for (i = 0; i < NSTREAMS; i++)
if (streams[i])
pa_stream_unref(streams[i]);
pa_mainloop_free(m);
return ret;
}
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