code.delx.au - pulseaudio/blob - src/tests/sync-playback.c

   1 /***
   2   This file is part of PulseAudio.
   3
   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 of the License,
   7   or (at your option) any later version.
   8
   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.
  13
  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
  17   USA.
  18 ***/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <signal.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <assert.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <getopt.h>
  32 #include <math.h>
  33
  34 #include <pulse/pulseaudio.h>
  35 #include <pulse/mainloop.h>
  36
  37 #define NSTREAMS 4
  38 #define SINE_HZ 440
  39 #define SAMPLE_HZ 8000
  40
  41 static pa_context *context = NULL;
  42 static pa_stream *streams[NSTREAMS];
  43 static pa_mainloop_api *mainloop_api = NULL;
  44
  45 static float data[SAMPLE_HZ]; /* one second space */
  46
  47 static int n_streams_ready = 0;
  48
  49 static const pa_sample_spec sample_spec = {
  50     .format = PA_SAMPLE_FLOAT32,
  51     .rate = SAMPLE_HZ,
  52     .channels = 1
  53 };
  54
  55 static const pa_buffer_attr buffer_attr = {
  56     .maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
  57     .tlength = (uint32_t) -1,
  58     .prebuf = 0, /* Setting prebuf to 0 guarantees us the the streams will run synchronously, no matter what */
  59     .minreq = (uint32_t) -1,
  60     .fragsize = 0
  61 };
  62
  63 static void nop_free_cb(void *p) {}
  64
  65 static void underflow_cb(struct pa_stream *s, void *userdata) {
  66     int i = (int) (long) userdata;
  67
  68     fprintf(stderr, "Stream %i finished\n", i);
  69
  70     if (++n_streams_ready >= 2*NSTREAMS) {
  71         fprintf(stderr, "We're done\n");
  72         mainloop_api->quit(mainloop_api, 0);
  73     }
  74 }
  75
  76 /* This routine is called whenever the stream state changes */
  77 static void stream_state_callback(pa_stream *s, void *userdata) {
  78     assert(s);
  79
  80     switch (pa_stream_get_state(s)) {
  81         case PA_STREAM_UNCONNECTED:
  82         case PA_STREAM_CREATING:
  83         case PA_STREAM_TERMINATED:
  84             break;
  85
  86         case PA_STREAM_READY: {
  87
  88             int r, i = (int) (long) userdata;
  89
  90             fprintf(stderr, "Writing data to stream %i.\n", i);
  91
  92             r = pa_stream_write(s, data, sizeof(data), nop_free_cb, sizeof(data) * i, PA_SEEK_ABSOLUTE);
  93             assert(r == 0);
  94
  95             /* Be notified when this stream is drained */
  96             pa_stream_set_underflow_callback(s, underflow_cb, userdata);
  97
  98             /* All streams have been set up, let's go! */
  99             if (++n_streams_ready >= NSTREAMS) {
 100                 fprintf(stderr, "Uncorking\n");
 101                 pa_operation_unref(pa_stream_cork(s, 0, NULL, NULL));
 102             }
 103
 104             break;
 105         }
 106
 107         default:
 108         case PA_STREAM_FAILED:
 109             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
 110             abort();
 111     }
 112 }
 113
 114 /* This is called whenever the context status changes */
 115 static void context_state_callback(pa_context *c, void *userdata) {
 116     assert(c);
 117
 118     switch (pa_context_get_state(c)) {
 119         case PA_CONTEXT_CONNECTING:
 120         case PA_CONTEXT_AUTHORIZING:
 121         case PA_CONTEXT_SETTING_NAME:
 122             break;
 123
 124         case PA_CONTEXT_READY: {
 125
 126             int i;
 127             fprintf(stderr, "Connection established.\n");
 128
 129             for (i = 0; i < NSTREAMS; i++) {
 130                 char name[64];
 131
 132                 fprintf(stderr, "Creating stream %i\n", i);
 133
 134                 snprintf(name, sizeof(name), "stream #%i", i);
 135
 136                 streams[i] = pa_stream_new(c, name, &sample_spec, NULL);
 137                 assert(streams[i]);
 138                 pa_stream_set_state_callback(streams[i], stream_state_callback, (void*) (long) i);
 139                 pa_stream_connect_playback(streams[i], NULL, &buffer_attr, PA_STREAM_START_CORKED, NULL, i == 0 ? NULL : streams[0]);
 140             }
 141
 142             break;
 143         }
 144
 145         case PA_CONTEXT_TERMINATED:
 146             mainloop_api->quit(mainloop_api, 0);
 147             break;
 148
 149         case PA_CONTEXT_FAILED:
 150         default:
 151             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
 152             abort();
 153     }
 154 }
 155
 156 int main(int argc, char *argv[]) {
 157     pa_mainloop* m = NULL;
 158     int i, ret = 0;
 159
 160     for (i = 0; i < SAMPLE_HZ; i++)
 161         data[i] = (float) sin(((double) i/SAMPLE_HZ)*2*M_PI*SINE_HZ)/2;
 162
 163     for (i = 0; i < NSTREAMS; i++)
 164         streams[i] = NULL;
 165
 166     /* Set up a new main loop */
 167     m = pa_mainloop_new();
 168     assert(m);
 169
 170     mainloop_api = pa_mainloop_get_api(m);
 171
 172     context = pa_context_new(mainloop_api, argv[0]);
 173     assert(context);
 174
 175     pa_context_set_state_callback(context, context_state_callback, NULL);
 176
 177     pa_context_connect(context, NULL, 0, NULL);
 178
 179     if (pa_mainloop_run(m, &ret) < 0)
 180         fprintf(stderr, "pa_mainloop_run() failed.\n");
 181
 182     pa_context_unref(context);
 183
 184     for (i = 0; i < NSTREAMS; i++)
 185         if (streams[i])
 186             pa_stream_unref(streams[i]);
 187
 188     pa_mainloop_free(m);
 189
 190     return ret;
 191 }