code.delx.au - pulseaudio/blob - src/modules/macosx/module-coreaudio-detect.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009,2010 Daniel Mack <daniel@caiaq.de>
   5
   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 2.1 of the License,
   9   or (at your option) any later version.
  10
  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.
  15
  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
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <pulse/xmalloc.h>
  27
  28 #include <pulsecore/module.h>
  29 #include <pulsecore/core-util.h>
  30 #include <pulsecore/modargs.h>
  31 #include <pulsecore/log.h>
  32 #include <pulsecore/llist.h>
  33
  34 #include <CoreAudio/CoreAudio.h>
  35
  36 #include "module-coreaudio-detect-symdef.h"
  37
  38 #define DEVICE_MODULE_NAME "module-coreaudio-device"
  39
  40 PA_MODULE_AUTHOR("Daniel Mack");
  41 PA_MODULE_DESCRIPTION("CoreAudio device detection");
  42 PA_MODULE_VERSION(PACKAGE_VERSION);
  43 PA_MODULE_LOAD_ONCE(TRUE);
  44 PA_MODULE_USAGE("");
  45
  46 typedef struct ca_device ca_device;
  47
  48 struct ca_device {
  49     AudioObjectID id;
  50     unsigned int module_index;
  51     PA_LLIST_FIELDS(ca_device);
  52 };
  53
  54 struct userdata {
  55     int detect_fds[2];
  56     pa_io_event *detect_io;
  57
  58     PA_LLIST_HEAD(ca_device, devices);
  59 };
  60
  61 static int ca_device_added(struct pa_module *m, AudioObjectID id) {
  62     AudioObjectPropertyAddress property_address;
  63     OSStatus err;
  64     pa_module *mod;
  65     struct userdata *u;
  66     struct ca_device *dev;
  67     char *args, tmp[64];
  68     UInt32 size;
  69
  70     pa_assert(m);
  71     pa_assert_se(u = m->userdata);
  72
  73     /* To prevent generating a black hole that will suck us in,
  74        don't create sources/sinks for PulseAudio virtual devices */
  75
  76     property_address.mSelector = kAudioDevicePropertyDeviceManufacturer;
  77     property_address.mScope = kAudioObjectPropertyScopeGlobal;
  78     property_address.mElement = kAudioObjectPropertyElementMaster;
  79
  80     size = sizeof(tmp);
  81     err = AudioObjectGetPropertyData(id, &property_address, 0, NULL, &size, tmp);
  82
  83     if (!err && strcmp(tmp, "pulseaudio.org") == 0)
  84         return 0;
  85
  86     args = pa_sprintf_malloc("object_id=%d", (int) id);
  87     pa_log_debug("Loading %s with arguments '%s'", DEVICE_MODULE_NAME, args);
  88     mod = pa_module_load(m->core, DEVICE_MODULE_NAME, args);
  89     pa_xfree(args);
  90
  91     if (!mod) {
  92         pa_log_info("Failed to load module %s with arguments '%s'", DEVICE_MODULE_NAME, args);
  93         return -1;
  94     }
  95
  96     dev = pa_xnew0(ca_device, 1);
  97     dev->module_index = mod->index;
  98     dev->id = id;
  99
 100     PA_LLIST_INIT(ca_device, dev);
 101     PA_LLIST_PREPEND(ca_device, u->devices, dev);
 102
 103     return 0;
 104 }
 105
 106 static int ca_update_device_list(struct pa_module *m) {
 107     AudioObjectPropertyAddress property_address;
 108     OSStatus err;
 109     UInt32 i, size, num_devices;
 110     AudioDeviceID *device_id;
 111     struct ca_device *dev;
 112     struct userdata *u;
 113
 114     pa_assert(m);
 115     pa_assert_se(u = m->userdata);
 116
 117     property_address.mSelector = kAudioHardwarePropertyDevices;
 118     property_address.mScope = kAudioObjectPropertyScopeGlobal;
 119     property_address.mElement = kAudioObjectPropertyElementMaster;
 120
 121     /* get the number of currently available audio devices */
 122     err = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &property_address, 0, NULL, &size);
 123     if (err) {
 124         pa_log("Unable to get data size for kAudioHardwarePropertyDevices.");
 125         return -1;
 126     }
 127
 128     num_devices = size / sizeof(AudioDeviceID);
 129     device_id = pa_xnew(AudioDeviceID, num_devices);
 130
 131     err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &property_address, 0, NULL, &size, device_id);
 132     if (err) {
 133         pa_log("Unable to get kAudioHardwarePropertyDevices.");
 134         pa_xfree(device_id);
 135         return -1;
 136     }
 137
 138     /* scan for devices which are reported but not in our cached list */
 139     for (i = 0; i < num_devices; i++) {
 140         bool found = FALSE;
 141
 142         PA_LLIST_FOREACH(dev, u->devices)
 143             if (dev->id == device_id[i]) {
 144                 found = TRUE;
 145                 break;
 146             }
 147
 148         if (!found)
 149             ca_device_added(m, device_id[i]);
 150     }
 151
 152     /* scan for devices which are in our cached list but are not reported */
 153 scan_removed:
 154
 155     PA_LLIST_FOREACH(dev, u->devices) {
 156         bool found = FALSE;
 157
 158         for (i = 0; i < num_devices; i++)
 159             if (dev->id == device_id[i]) {
 160                 found = TRUE;
 161                 break;
 162             }
 163
 164         if (!found) {
 165             pa_log_debug("object id %d has been removed (module index %d) %p", (unsigned int) dev->id, dev->module_index, dev);
 166             pa_module_unload_request_by_index(m->core, dev->module_index, TRUE);
 167             PA_LLIST_REMOVE(ca_device, u->devices, dev);
 168             pa_xfree(dev);
 169             /* the current list item pointer is not valid anymore, so start over. */
 170             goto scan_removed;
 171         }
 172     }
 173
 174     pa_xfree(device_id);
 175     return 0;
 176 }
 177
 178 static OSStatus property_listener_proc(AudioObjectID objectID, UInt32 numberAddresses,
 179                                        const AudioObjectPropertyAddress inAddresses[],
 180                                        void *clientData)
 181 {
 182     struct userdata *u = clientData;
 183     char dummy = 1;
 184
 185     pa_assert(u);
 186
 187     /* dispatch module load/unload operations in main thread */
 188     write(u->detect_fds[1], &dummy, 1);
 189
 190     return 0;
 191 }
 192
 193 static void detect_handle(pa_mainloop_api *a, pa_io_event *e, int fd, pa_io_event_flags_t events, void *userdata) {
 194     pa_module *m = userdata;
 195     char dummy;
 196
 197     pa_assert(m);
 198
 199     read(fd, &dummy, 1);
 200     ca_update_device_list(m);
 201 }
 202
 203 int pa__init(pa_module *m) {
 204     struct userdata *u = pa_xnew0(struct userdata, 1);
 205     AudioObjectPropertyAddress property_address;
 206
 207     pa_assert(m);
 208
 209     m->userdata = u;
 210
 211     property_address.mSelector = kAudioHardwarePropertyDevices;
 212     property_address.mScope = kAudioObjectPropertyScopeGlobal;
 213     property_address.mElement = kAudioObjectPropertyElementMaster;
 214
 215     if (AudioObjectAddPropertyListener(kAudioObjectSystemObject, &property_address, property_listener_proc, u)) {
 216         pa_log("AudioObjectAddPropertyListener() failed.");
 217         goto fail;
 218     }
 219
 220     if (ca_update_device_list(m))
 221        goto fail;
 222
 223     pa_assert_se(pipe(u->detect_fds) == 0);
 224     pa_assert_se(u->detect_io = m->core->mainloop->io_new(m->core->mainloop, u->detect_fds[0], PA_IO_EVENT_INPUT, detect_handle, m));
 225
 226     return 0;
 227
 228 fail:
 229     pa_xfree(u);
 230     return -1;
 231 }
 232
 233 void pa__done(pa_module *m) {
 234     struct userdata *u;
 235     struct ca_device *dev;
 236     AudioObjectPropertyAddress property_address;
 237
 238     pa_assert(m);
 239     pa_assert_se(u = m->userdata);
 240
 241     dev = u->devices;
 242
 243     property_address.mSelector = kAudioHardwarePropertyDevices;
 244     property_address.mScope = kAudioObjectPropertyScopeGlobal;
 245     property_address.mElement = kAudioObjectPropertyElementMaster;
 246
 247     AudioObjectRemovePropertyListener(kAudioObjectSystemObject, &property_address, property_listener_proc, u);
 248
 249     while (dev) {
 250         struct ca_device *next = dev->next;
 251
 252         pa_module_unload_request_by_index(m->core, dev->module_index, TRUE);
 253         pa_xfree(dev);
 254
 255         dev = next;
 256     }
 257
 258     if (u->detect_fds[0] >= 0)
 259         close(u->detect_fds[0]);
 260
 261     if (u->detect_fds[1] >= 0)
 262         close(u->detect_fds[1]);
 263
 264     if (u->detect_io)
 265         m->core->mainloop->io_free(u->detect_io);
 266
 267     pa_xfree(u);
 268 }