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 2.1 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 <errno.h>
  26 #include <unistd.h>
  27 #include <assert.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <math.h>
  31
  32 #include <pulse/pulseaudio.h>
  33 #include <pulse/mainloop.h>
  34
  35 #define NSTREAMS 4
  36 #define SINE_HZ 440
  37 #define SAMPLE_HZ 8000
  38
  39 static pa_context *context = NULL;
  40 static pa_stream *streams[NSTREAMS];
  41 static pa_mainloop_api *mainloop_api = NULL;
  42
  43 static float data[SAMPLE_HZ]; /* one second space */
  44
  45 static int n_streams_ready = 0;
  46
  47 static const pa_sample_spec sample_spec = {
  48     .format = PA_SAMPLE_FLOAT32,
  49     .rate = SAMPLE_HZ,
  50     .channels = 1
  51 };
  52
  53 static const pa_buffer_attr buffer_attr = {
  54     .maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
  55     .tlength = (uint32_t) -1,
  56     .prebuf = 0, /* Setting prebuf to 0 guarantees us the streams will run synchronously, no matter what */
  57     .minreq = (uint32_t) -1,
  58     .fragsize = 0
  59 };
  60
  61 static void nop_free_cb(void *p) {}
  62
  63 static void underflow_cb(struct pa_stream *s, void *userdata) {
  64     int i = (int) (long) userdata;
  65
  66     fprintf(stderr, "Stream %i finished\n", i);
  67
  68     if (++n_streams_ready >= 2*NSTREAMS) {
  69         fprintf(stderr, "We're done\n");
  70         mainloop_api->quit(mainloop_api, 0);
  71     }
  72 }
  73
  74 /* This routine is called whenever the stream state changes */
  75 static void stream_state_callback(pa_stream *s, void *userdata) {
  76     assert(s);
  77
  78     switch (pa_stream_get_state(s)) {
  79         case PA_STREAM_UNCONNECTED:
  80         case PA_STREAM_CREATING:
  81         case PA_STREAM_TERMINATED:
  82             break;
  83
  84         case PA_STREAM_READY: {
  85
  86             int r, i = (int) (long) userdata;
  87
  88             fprintf(stderr, "Writing data to stream %i.\n", i);
  89
  90             r = pa_stream_write(s, data, sizeof(data), nop_free_cb, (int64_t) sizeof(data) * (int64_t) i, PA_SEEK_ABSOLUTE);
  91             assert(r == 0);
  92
  93             /* Be notified when this stream is drained */
  94             pa_stream_set_underflow_callback(s, underflow_cb, userdata);
  95
  96             /* All streams have been set up, let's go! */
  97             if (++n_streams_ready >= NSTREAMS) {
  98                 fprintf(stderr, "Uncorking\n");
  99                 pa_operation_unref(pa_stream_cork(s, 0, NULL, NULL));
 100             }
 101
 102             break;
 103         }
 104
 105         default:
 106         case PA_STREAM_FAILED:
 107             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
 108             abort();
 109     }
 110 }
 111
 112 /* This is called whenever the context status changes */
 113 static void context_state_callback(pa_context *c, void *userdata) {
 114     assert(c);
 115
 116     switch (pa_context_get_state(c)) {
 117         case PA_CONTEXT_CONNECTING:
 118         case PA_CONTEXT_AUTHORIZING:
 119         case PA_CONTEXT_SETTING_NAME:
 120             break;
 121
 122         case PA_CONTEXT_READY: {
 123
 124             int i;
 125             fprintf(stderr, "Connection established.\n");
 126
 127             for (i = 0; i < NSTREAMS; i++) {
 128                 char name[64];
 129
 130                 fprintf(stderr, "Creating stream %i\n", i);
 131
 132                 snprintf(name, sizeof(name), "stream #%i", i);
 133
 134                 streams[i] = pa_stream_new(c, name, &sample_spec, NULL);
 135                 assert(streams[i]);
 136                 pa_stream_set_state_callback(streams[i], stream_state_callback, (void*) (long) i);
 137                 pa_stream_connect_playback(streams[i], NULL, &buffer_attr, PA_STREAM_START_CORKED, NULL, i == 0 ? NULL : streams[0]);
 138             }
 139
 140             break;
 141         }
 142
 143         case PA_CONTEXT_TERMINATED:
 144             mainloop_api->quit(mainloop_api, 0);
 145             break;
 146
 147         case PA_CONTEXT_FAILED:
 148         default:
 149             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
 150             abort();
 151     }
 152 }
 153
 154 int main(int argc, char *argv[]) {
 155     pa_mainloop* m = NULL;
 156     int i, ret = 0;
 157
 158     for (i = 0; i < SAMPLE_HZ; i++)
 159         data[i] = (float) sin(((double) i/SAMPLE_HZ)*2*M_PI*SINE_HZ)/2;
 160
 161     for (i = 0; i < NSTREAMS; i++)
 162         streams[i] = NULL;
 163
 164     /* Set up a new main loop */
 165     m = pa_mainloop_new();
 166     assert(m);
 167
 168     mainloop_api = pa_mainloop_get_api(m);
 169
 170     context = pa_context_new(mainloop_api, argv[0]);
 171     assert(context);
 172
 173     pa_context_set_state_callback(context, context_state_callback, NULL);
 174
 175     /* Connect the context */
 176     if (pa_context_connect(context, NULL, 0, NULL) < 0) {
 177         fprintf(stderr, "pa_context_connect() failed.\n");
 178         goto quit;
 179     }
 180
 181     if (pa_mainloop_run(m, &ret) < 0)
 182         fprintf(stderr, "pa_mainloop_run() failed.\n");
 183
 184 quit:
 185     pa_context_unref(context);
 186
 187     for (i = 0; i < NSTREAMS; i++)
 188         if (streams[i])
 189             pa_stream_unref(streams[i]);
 190
 191     pa_mainloop_free(m);
 192
 193     return ret;
 194 }