2 This file is part of PulseAudio.
4 PulseAudio is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 2.1 of the License,
7 or (at your option) any later version.
9 PulseAudio is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License
15 along with PulseAudio; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
32 #include <pulse/pulseaudio.h>
33 #include <pulse/mainloop.h>
37 #define SAMPLE_HZ 8000
39 static pa_context *context = NULL;
40 static pa_stream *streams[NSTREAMS];
41 static pa_mainloop_api *mainloop_api = NULL;
43 static float data[SAMPLE_HZ]; /* one second space */
45 static int n_streams_ready = 0;
47 static const pa_buffer_attr buffer_attr = {
48 .maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
49 .tlength = (uint32_t) -1,
50 .prebuf = 0, /* Setting prebuf to 0 guarantees us the streams will run synchronously, no matter what */
51 .minreq = (uint32_t) -1,
55 static void nop_free_cb(void *p) {}
57 static void underflow_cb(struct pa_stream *s, void *userdata) {
58 int i = (int) (long) userdata;
60 fprintf(stderr, "Stream %i finished\n", i);
62 if (++n_streams_ready >= 2*NSTREAMS) {
63 fprintf(stderr, "We're done\n");
64 mainloop_api->quit(mainloop_api, 0);
68 /* This routine is called whenever the stream state changes */
69 static void stream_state_callback(pa_stream *s, void *userdata) {
72 switch (pa_stream_get_state(s)) {
73 case PA_STREAM_UNCONNECTED:
74 case PA_STREAM_CREATING:
75 case PA_STREAM_TERMINATED:
78 case PA_STREAM_READY: {
80 int r, i = (int) (long) userdata;
82 fprintf(stderr, "Writing data to stream %i.\n", i);
84 r = pa_stream_write(s, data, sizeof(data), nop_free_cb, (int64_t) sizeof(data) * (int64_t) i, PA_SEEK_ABSOLUTE);
87 /* Be notified when this stream is drained */
88 pa_stream_set_underflow_callback(s, underflow_cb, userdata);
90 /* All streams have been set up, let's go! */
91 if (++n_streams_ready >= NSTREAMS) {
92 fprintf(stderr, "Uncorking\n");
93 pa_operation_unref(pa_stream_cork(s, 0, NULL, NULL));
100 case PA_STREAM_FAILED:
101 fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
106 /* This is called whenever the context status changes */
107 static void context_state_callback(pa_context *c, void *userdata) {
110 switch (pa_context_get_state(c)) {
111 case PA_CONTEXT_CONNECTING:
112 case PA_CONTEXT_AUTHORIZING:
113 case PA_CONTEXT_SETTING_NAME:
116 case PA_CONTEXT_READY: {
119 fprintf(stderr, "Connection established.\n");
121 for (i = 0; i < NSTREAMS; i++) {
123 pa_format_info *formats[1];
125 formats[0] = pa_format_info_new();
126 formats[0]->encoding = PA_ENCODING_PCM;
127 pa_format_info_set_sample_format(formats[0], PA_SAMPLE_FLOAT32);
128 pa_format_info_set_rate(formats[0], SAMPLE_HZ);
129 pa_format_info_set_channels(formats[0], 1);
131 fprintf(stderr, "Creating stream %i\n", i);
133 snprintf(name, sizeof(name), "stream #%i", i);
135 streams[i] = pa_stream_new_extended(c, name, formats, 1, NULL);
137 pa_stream_set_state_callback(streams[i], stream_state_callback, (void*) (long) i);
138 pa_stream_connect_playback(streams[i], NULL, &buffer_attr, PA_STREAM_START_CORKED, NULL, i == 0 ? NULL : streams[0]);
140 pa_format_info_free(formats[0]);
146 case PA_CONTEXT_TERMINATED:
147 mainloop_api->quit(mainloop_api, 0);
150 case PA_CONTEXT_FAILED:
152 fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
157 int main(int argc, char *argv[]) {
158 pa_mainloop* m = NULL;
161 for (i = 0; i < SAMPLE_HZ; i++)
162 data[i] = (float) sin(((double) i/SAMPLE_HZ)*2*M_PI*SINE_HZ)/2;
164 for (i = 0; i < NSTREAMS; i++)
167 /* Set up a new main loop */
168 m = pa_mainloop_new();
171 mainloop_api = pa_mainloop_get_api(m);
173 context = pa_context_new(mainloop_api, argv[0]);
176 pa_context_set_state_callback(context, context_state_callback, NULL);
178 /* Connect the context */
179 if (pa_context_connect(context, NULL, 0, NULL) < 0) {
180 fprintf(stderr, "pa_context_connect() failed.\n");
184 if (pa_mainloop_run(m, &ret) < 0)
185 fprintf(stderr, "pa_mainloop_run() failed.\n");
188 pa_context_unref(context);
190 for (i = 0; i < NSTREAMS; i++)
192 pa_stream_unref(streams[i]);