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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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.
  10
  11   polypaudio 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.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <assert.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <getopt.h>
  34 #include <math.h>
  35
  36 #include <polyp/polypaudio.h>
  37 #include <polyp/mainloop.h>
  38
  39 #define NSTREAMS 4
  40 #define SINE_HZ 440
  41 #define SAMPLE_HZ 8000
  42
  43 static pa_context *context = NULL;
  44 static pa_stream *streams[NSTREAMS];
  45 static pa_mainloop_api *mainloop_api = NULL;
  46
  47 static float data[SAMPLE_HZ]; /* one second space */
  48
  49 static int n_streams_ready = 0;
  50
  51 static const pa_sample_spec sample_spec = {
  52     .format = PA_SAMPLE_FLOAT32,
  53     .rate = SAMPLE_HZ,
  54     .channels = 1
  55 };
  56
  57 static const pa_buffer_attr buffer_attr = {
  58     .maxlength = SAMPLE_HZ*sizeof(float)*NSTREAMS, /* exactly space for the entire play time */
  59     .tlength = 0,
  60     .prebuf = 0, /* Setting prebuf to 0 guarantees us the the streams will run synchronously, no matter what */
  61     .minreq = 0
  62 };
  63
  64 static void nop_free_cb(void *p) {}
  65
  66 static void underflow_cb(struct pa_stream *s, void *userdata) {
  67     int i = (int) (long) userdata;
  68
  69     fprintf(stderr, "Stream %i finished\n", i);
  70
  71     if (++n_streams_ready >= 2*NSTREAMS) {
  72         fprintf(stderr, "We're done\n");
  73         mainloop_api->quit(mainloop_api, 0);
  74     }
  75 }
  76
  77 /* This routine is called whenever the stream state changes */
  78 static void stream_state_callback(pa_stream *s, void *userdata) {
  79     assert(s);
  80
  81     switch (pa_stream_get_state(s)) {
  82         case PA_STREAM_UNCONNECTED:
  83         case PA_STREAM_CREATING:
  84         case PA_STREAM_TERMINATED:
  85             break;
  86
  87         case PA_STREAM_READY: {
  88
  89             int r, i = (int) (long) userdata;
  90
  91             fprintf(stderr, "Writing data to stream %i.\n", i);
  92
  93             r = pa_stream_write(s, data, sizeof(data), nop_free_cb, sizeof(data) * i, PA_SEEK_ABSOLUTE);
  94             assert(r == 0);
  95
  96             /* Be notified when this stream is drained */
  97             pa_stream_set_underflow_callback(s, underflow_cb, userdata);
  98
  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));
 103             }
 104
 105             break;
 106         }
 107
 108         default:
 109         case PA_STREAM_FAILED:
 110             fprintf(stderr, "Stream error: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
 111             abort();
 112     }
 113 }
 114
 115 /* This is called whenever the context status changes */
 116 static void context_state_callback(pa_context *c, void *userdata) {
 117     assert(c);
 118
 119     switch (pa_context_get_state(c)) {
 120         case PA_CONTEXT_CONNECTING:
 121         case PA_CONTEXT_AUTHORIZING:
 122         case PA_CONTEXT_SETTING_NAME:
 123             break;
 124
 125         case PA_CONTEXT_READY: {
 126
 127             int i;
 128             fprintf(stderr, "Connection established.\n");
 129
 130             for (i = 0; i < NSTREAMS; i++) {
 131                 char name[64];
 132
 133                 fprintf(stderr, "Creating stream %i\n", i);
 134
 135                 snprintf(name, sizeof(name), "stream #%i", i);
 136
 137                 streams[i] = pa_stream_new(c, name, &sample_spec, NULL);
 138                 assert(streams[i]);
 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]);
 141             }
 142
 143             break;
 144         }
 145
 146         case PA_CONTEXT_TERMINATED:
 147             mainloop_api->quit(mainloop_api, 0);
 148             break;
 149
 150         case PA_CONTEXT_FAILED:
 151         default:
 152             fprintf(stderr, "Context error: %s\n", pa_strerror(pa_context_errno(c)));
 153             abort();
 154     }
 155 }
 156
 157 int main(int argc, char *argv[]) {
 158     pa_mainloop* m = NULL;
 159     int i, ret = 0;
 160
 161     for (i = 0; i < SAMPLE_HZ; i++)
 162         data[i] = (float) sin(((double) i/SAMPLE_HZ)*2*M_PI*SINE_HZ)/2;
 163
 164     for (i = 0; i < NSTREAMS; i++)
 165         streams[i] = NULL;
 166
 167     /* Set up a new main loop */
 168     m = pa_mainloop_new();
 169     assert(m);
 170
 171     mainloop_api = pa_mainloop_get_api(m);
 172
 173     context = pa_context_new(mainloop_api, argv[0]);
 174     assert(context);
 175
 176     pa_context_set_state_callback(context, context_state_callback, NULL);
 177
 178     pa_context_connect(context, NULL, 0, NULL);
 179
 180     if (pa_mainloop_run(m, &ret) < 0)
 181         fprintf(stderr, "pa_mainloop_run() failed.\n");
 182
 183     pa_context_unref(context);
 184
 185     for (i = 0; i < NSTREAMS; i++)
 186         if (streams[i])
 187             pa_stream_unref(streams[i]);
 188
 189     pa_mainloop_free(m);
 190
 191     return ret;
 192 }