dbus/audio_reserve.c

   1 /*
   2     Copyright (C) 2009 Grame
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License.
   7
   8     This program is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11     GNU General Public License for more details.
  12
  13     You should have received a copy of the GNU General Public License
  14     along with this program; if not, write to the Free Software
  15     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17 */
  18
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <assert.h>
  25 #include <stdint.h>
  26
  27 #include "reserve.h"
  28 #include "audio_reserve.h"
  29 #include "JackError.h"
  30
  31 #define DEVICE_MAX 2
  32
  33 typedef struct reserved_audio_device {
  34
  35      char device_name[64];
  36      rd_device * reserved_device;
  37
  38 } reserved_audio_device;
  39
  40 static DBusConnection* gConnection = NULL;
  41 static reserved_audio_device gReservedDevice[DEVICE_MAX];
  42 static int gReserveCount = 0;
  43
  44 SERVER_EXPORT int audio_reservation_init()
  45 {
  46     DBusError error;
  47     dbus_error_init(&error);
  48
  49     if (!(gConnection = dbus_bus_get(DBUS_BUS_SESSION, &error))) {
  50         jack_error("Failed to connect to session bus for device reservation %s\n", error.message);
  51         return -1;
  52     }
  53
  54     jack_info("audio_reservation_init");
  55     return 0;
  56 }
  57
  58 SERVER_EXPORT int audio_reservation_finish()
  59 {
  60     if (gConnection) {
  61         dbus_connection_unref(gConnection);
  62         gConnection = NULL;
  63         jack_info("audio_reservation_finish");
  64     }
  65     return 0;
  66 }
  67
  68 SERVER_EXPORT bool audio_acquire(const char * device_name)
  69 {
  70     DBusError error;
  71     int ret;
  72
  73     // Open DBus connection first time
  74     if (gReserveCount == 0)
  75        audio_reservation_init();
  76
  77     assert(gReserveCount < DEVICE_MAX);
  78
  79     if ((ret= rd_acquire(
  80                  &gReservedDevice[gReserveCount].reserved_device,
  81                  gConnection,
  82                  device_name,
  83                  "Jack audio server",
  84                  INT32_MAX,
  85                  NULL,
  86                  &error)) < 0) {
  87
  88         jack_error("Failed to acquire device name : %s error : %s", device_name, (error.message ? error.message : strerror(-ret)));
  89         return false;
  90     }
  91
  92     strcpy(gReservedDevice[gReserveCount].device_name, device_name);
  93     gReserveCount++;
  94     jack_info("Acquire audio card %s", device_name);
  95     return true;
  96 }
  97
  98 SERVER_EXPORT void audio_release(const char * device_name)
  99 {
 100     int i;
 101
 102     // Look for corresponding reserved device
 103     for (i = 0; i < DEVICE_MAX; i++) {
 104         if (strcmp(gReservedDevice[i].device_name, device_name) == 0)
 105             break;
 106     }
 107
 108     if (i < DEVICE_MAX) {
 109         jack_info("Released audio card %s", device_name);
 110         rd_release(gReservedDevice[i].reserved_device);
 111     } else {
 112         jack_error("Audio card %s not found!!", device_name);
 113     }
 114
 115     // Close DBus connection last time
 116     gReserveCount--;
 117     if (gReserveCount == 0)
 118         audio_reservation_finish();
 119 }
 120
 121 SERVER_EXPORT void audio_reserve_loop()
 122 {
 123     if (gConnection != NULL) {
 124        while (dbus_connection_read_write_dispatch (gConnection, -1))
 125          ; // empty loop body
 126     }
 127 }
 128