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/***
This file is part of PulseAudio.
Copyright 2009 Daniel Mack <daniel@caiaq.de>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulse/xmalloc.h>
#include <pulsecore/module.h>
#include <pulsecore/core-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/log.h>
#include <pulsecore/llist.h>
#include <CoreAudio/CoreAudio.h>
#include "module-coreaudio-detect-symdef.h"
#define DEVICE_MODULE_NAME "module-coreaudio-device"
PA_MODULE_AUTHOR("Daniel Mack");
PA_MODULE_DESCRIPTION("CoreAudio device detection");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(TRUE);
PA_MODULE_USAGE("");
typedef struct ca_device ca_device;
struct ca_device {
AudioDeviceID id;
unsigned int module_index;
PA_LLIST_FIELDS(ca_device);
};
struct userdata {
int detect_fds[2];
pa_io_event *detect_io;
PA_LLIST_HEAD(ca_device, devices);
};
static int ca_device_added(struct pa_module *m, AudioDeviceID id) {
pa_module *mod;
struct userdata *u = m->userdata;
struct ca_device *dev;
char *args;
pa_assert(u);
args = pa_sprintf_malloc("device_id=%d", (int) id);
pa_log_debug("Loading %s with arguments '%s'", DEVICE_MODULE_NAME, args);
mod = pa_module_load(m->core, DEVICE_MODULE_NAME, args);
pa_xfree(args);
if (!mod) {
pa_log_info("Failed to load module %s with arguments '%s'", DEVICE_MODULE_NAME, args);
return -1;
}
dev = pa_xnew0(ca_device, 1);
dev->module_index = mod->index;
dev->id = id;
PA_LLIST_INIT(ca_device, dev);
PA_LLIST_PREPEND(ca_device, u->devices, dev);
return 0;
}
static int ca_update_device_list(struct pa_module *m) {
OSStatus err;
UInt32 i, size, num_devices;
Boolean writable;
AudioDeviceID *device_id;
struct ca_device *dev;
struct userdata *u = m->userdata;
pa_assert(u);
/* get the number of currently available audio devices */
err = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &size, &writable);
if (err) {
pa_log("Unable to get info for kAudioHardwarePropertyDevices.");
return -1;
}
num_devices = size / sizeof(AudioDeviceID);
device_id = pa_xnew(AudioDeviceID, num_devices);
err = AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &size, device_id);
if (err) {
pa_log("Unable to get kAudioHardwarePropertyDevices.");
pa_xfree(device_id);
return -1;
}
/* scan for devices which are reported but not in our cached list */
for (i = 0; i < num_devices; i++) {
bool found = FALSE;
PA_LLIST_FOREACH(dev, u->devices)
if (dev->id == device_id[i]) {
found = TRUE;
break;
}
if (!found)
ca_device_added(m, device_id[i]);
}
/* scan for devices which are in our cached list but are not reported */
scan_removed:
PA_LLIST_FOREACH(dev, u->devices) {
bool found = FALSE;
for (i = 0; i < num_devices; i++)
if (dev->id == device_id[i]) {
found = TRUE;
break;
}
if (!found) {
pa_log_debug("device id %d has been removed (module index %d) %p", (unsigned int) dev->id, dev->module_index, dev);
pa_module_unload_request_by_index(m->core, dev->module_index, TRUE);
PA_LLIST_REMOVE(ca_device, u->devices, dev);
pa_xfree(dev);
/* the current list item pointer is not valid anymore, so start over. */
goto scan_removed;
}
}
pa_xfree(device_id);
return 0;
}
static OSStatus property_listener_proc(AudioHardwarePropertyID property, void *data) {
struct userdata *u = data;
char dummy = 1;
pa_assert(u);
/* dispatch module load/unload operations in main thread */
if (property == kAudioHardwarePropertyDevices)
write(u->detect_fds[1], &dummy, 1);
return 0;
}
static void detect_handle(pa_mainloop_api *a, pa_io_event *e, int fd, pa_io_event_flags_t events, void *userdata) {
pa_module *m = userdata;
char dummy;
pa_assert(m);
read(fd, &dummy, 1);
ca_update_device_list(m);
}
int pa__init(pa_module *m) {
struct userdata *u = pa_xnew0(struct userdata, 1);
m->userdata = u;
if (AudioHardwareAddPropertyListener(kAudioHardwarePropertyDevices, property_listener_proc, u)) {
pa_log("AudioHardwareAddPropertyListener() failed.");
goto fail;
}
if (ca_update_device_list(m))
goto fail;
pa_assert_se(pipe(u->detect_fds) == 0);
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));
return 0;
fail:
pa_xfree(u);
return -1;
}
void pa__done(pa_module *m) {
struct userdata *u = m->userdata;
struct ca_device *dev = u->devices;
pa_assert(u);
AudioHardwareRemovePropertyListener(kAudioHardwarePropertyDevices, property_listener_proc);
while (dev) {
struct ca_device *next = dev->next;
pa_module_unload_request_by_index(m->core, dev->module_index, TRUE);
pa_xfree(dev);
dev = next;
}
if (u->detect_fds[0] >= 0)
close(u->detect_fds[0]);
if (u->detect_fds[1] >= 0)
close(u->detect_fds[1]);
if (u->detect_io)
m->core->mainloop->io_free(u->detect_io);
pa_xfree(u);
}
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