--- /dev/null
+/***
+ 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, 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_buffer_attr buffer_attr = {
+ .maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
+ .tlength = (uint32_t) -1,
+ .prebuf = 0, /* Setting prebuf to 0 guarantees us the the streams will run synchronously, no matter what */
+ .minreq = (uint32_t) -1,
+ .fragsize = 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, (int64_t) sizeof(data) * (int64_t) 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];
+ pa_format_info *formats[2] = { NULL };
+
+ formats[0] = pa_format_info_new();
+ formats[0]->encoding = PA_ENCODING_PCM;
+ pa_proplist_sets(formats[0]->plist, PA_PROP_FORMAT_SAMPLE_FORMAT, pa_sample_format_to_string(PA_SAMPLE_FLOAT32));
+ pa_proplist_setf(formats[0]->plist, PA_PROP_FORMAT_RATE, "%u", SAMPLE_HZ);
+ pa_proplist_setf(formats[0]->plist, PA_PROP_FORMAT_CHANNELS, "%u", 1);
+
+ fprintf(stderr, "Creating stream %i\n", i);
+
+ snprintf(name, sizeof(name), "stream #%i", i);
+
+ streams[i] = pa_stream_new_extended(c, name, formats, 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);
+
+ /* Connect the context */
+ if (pa_context_connect(context, NULL, 0, NULL) < 0) {
+ fprintf(stderr, "pa_context_connect() failed.\n");
+ goto quit;
+ }
+
+ if (pa_mainloop_run(m, &ret) < 0)
+ fprintf(stderr, "pa_mainloop_run() failed.\n");
+
+quit:
+ pa_context_unref(context);
+
+ for (i = 0; i < NSTREAMS; i++)
+ if (streams[i])
+ pa_stream_unref(streams[i]);
+
+ pa_mainloop_free(m);
+
+ return ret;
+}