Clementine-audio-player-Mac.../src/engines/osxdevicefinder.cpp

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2014-03-29 10:06:33 +01:00
/* This file is part of Clementine.
Copyright 2014, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine 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 General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include <memory>
#include <CoreAudio/AudioHardware.h>
#include "osxdevicefinder.h"
#include "core/logging.h"
#include "core/scoped_cftyperef.h"
namespace {
template <typename T>
std::unique_ptr<T> GetProperty(const AudioDeviceID& device_id,
const AudioObjectPropertyAddress& address,
UInt32* size_bytes_out = nullptr) {
UInt32 size_bytes = 0;
OSStatus status = AudioObjectGetPropertyDataSize(
device_id, &address, 0, NULL, &size_bytes);
if (status != kAudioHardwareNoError) {
qLog(Warning) << "AudioObjectGetPropertyDataSize failed:" << status;
return std::unique_ptr<T>();
}
std::unique_ptr<T> ret(reinterpret_cast<T*>(malloc(size_bytes)));
status = AudioObjectGetPropertyData(device_id,
&address,
0,
NULL,
&size_bytes,
ret.get());
if (status != kAudioHardwareNoError) {
qLog(Warning) << "AudioObjectGetPropertyData failed:" << status;
return std::unique_ptr<T>();
}
if (size_bytes_out) {
*size_bytes_out = size_bytes;
}
return ret;
}
} // namespace
OsxDeviceFinder::OsxDeviceFinder()
: DeviceFinder("osxaudiosink") {
}
QList<DeviceFinder::Device> OsxDeviceFinder::ListDevices() {
QList<Device> ret;
AudioObjectPropertyAddress address = {
kAudioHardwarePropertyDevices,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster
};
UInt32 device_size_bytes = 0;
std::unique_ptr<AudioDeviceID> devices =
GetProperty<AudioDeviceID>(
kAudioObjectSystemObject, address, &device_size_bytes);
if (!devices.get()) {
return ret;
}
const int device_count = device_size_bytes / sizeof(AudioDeviceID);
address.mScope = kAudioDevicePropertyScopeOutput;
for (UInt32 i = 0; i < device_count; ++i) {
const AudioDeviceID id = devices.get()[i];
// Query device name
address.mSelector = kAudioDevicePropertyDeviceNameCFString;
std::unique_ptr<CFStringRef> device_name =
GetProperty<CFStringRef>(id, address);
ScopedCFTypeRef<CFStringRef> scoped_device_name(*device_name.get());
if (!device_name.get()) {
continue;
}
// Determine if the device is an output device (it is an output device if
// it has output channels)
address.mSelector = kAudioDevicePropertyStreamConfiguration;
std::unique_ptr<AudioBufferList> buffer_list =
GetProperty<AudioBufferList>(id, address);
if (!buffer_list.get() || buffer_list->mNumberBuffers == 0) {
continue;
}
Device dev;
dev.description = QString::fromUtf8(
CFStringGetCStringPtr(*device_name, CFStringGetSystemEncoding()));
dev.device_property_value = id;
dev.icon_name = GuessIconName(dev.description);
ret.append(dev);
}
return ret;
}