4 This file is part of PulseAudio.
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
36 #include <pulse/pulseaudio.h>
37 #include <pulse/mainloop.h>
41 #define SAMPLE_HZ 8000
43 static pa_context
*context
= NULL
;
44 static pa_stream
*streams
[NSTREAMS
];
45 static pa_mainloop_api
*mainloop_api
= NULL
;
47 static float data
[SAMPLE_HZ
]; /* one second space */
49 static int n_streams_ready
= 0;
51 static const pa_sample_spec sample_spec
= {
52 .format
= PA_SAMPLE_FLOAT32
,
57 static const pa_buffer_attr buffer_attr
= {
58 .maxlength
= SAMPLE_HZ
*sizeof(float)*NSTREAMS
, /* exactly space for the entire play time */
60 .prebuf
= 0, /* Setting prebuf to 0 guarantees us the the streams will run synchronously, no matter what */
64 static void nop_free_cb(void *p
) {}
66 static void underflow_cb(struct pa_stream
*s
, void *userdata
) {
67 int i
= (int) (long) userdata
;
69 fprintf(stderr
, "Stream %i finished\n", i
);
71 if (++n_streams_ready
>= 2*NSTREAMS
) {
72 fprintf(stderr
, "We're done\n");
73 mainloop_api
->quit(mainloop_api
, 0);
77 /* This routine is called whenever the stream state changes */
78 static void stream_state_callback(pa_stream
*s
, void *userdata
) {
81 switch (pa_stream_get_state(s
)) {
82 case PA_STREAM_UNCONNECTED
:
83 case PA_STREAM_CREATING
:
84 case PA_STREAM_TERMINATED
:
87 case PA_STREAM_READY
: {
89 int r
, i
= (int) (long) userdata
;
91 fprintf(stderr
, "Writing data to stream %i.\n", i
);
93 r
= pa_stream_write(s
, data
, sizeof(data
), nop_free_cb
, sizeof(data
) * i
, PA_SEEK_ABSOLUTE
);
96 /* Be notified when this stream is drained */
97 pa_stream_set_underflow_callback(s
, underflow_cb
, userdata
);
99 /* All streams have been set up, let's go! */
100 if (++n_streams_ready
>= NSTREAMS
) {
101 fprintf(stderr
, "Uncorking\n");
102 pa_operation_unref(pa_stream_cork(s
, 0, NULL
, NULL
));
109 case PA_STREAM_FAILED
:
110 fprintf(stderr
, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s
))));
115 /* This is called whenever the context status changes */
116 static void context_state_callback(pa_context
*c
, void *userdata
) {
119 switch (pa_context_get_state(c
)) {
120 case PA_CONTEXT_CONNECTING
:
121 case PA_CONTEXT_AUTHORIZING
:
122 case PA_CONTEXT_SETTING_NAME
:
125 case PA_CONTEXT_READY
: {
128 fprintf(stderr
, "Connection established.\n");
130 for (i
= 0; i
< NSTREAMS
; i
++) {
133 fprintf(stderr
, "Creating stream %i\n", i
);
135 snprintf(name
, sizeof(name
), "stream #%i", i
);
137 streams
[i
] = pa_stream_new(c
, name
, &sample_spec
, NULL
);
139 pa_stream_set_state_callback(streams
[i
], stream_state_callback
, (void*) (long) i
);
140 pa_stream_connect_playback(streams
[i
], NULL
, &buffer_attr
, PA_STREAM_START_CORKED
, NULL
, i
== 0 ? NULL
: streams
[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 pa_context_connect(context
, NULL
, 0, NULL
);
180 if (pa_mainloop_run(m
, &ret
) < 0)
181 fprintf(stderr
, "pa_mainloop_run() failed.\n");
183 pa_context_unref(context
);
185 for (i
= 0; i
< NSTREAMS
; i
++)
187 pa_stream_unref(streams
[i
]);