| 1 | #include "Python.h"
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| 2 | #include <AudioToolbox/AudioServices.h>
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| 3 |
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| 4 | #define FourCC2Str(code) (char[5]){(code >> 24) & 0xFF, (code >> 16) & 0xFF, (code >> 8) & 0xFF, code & 0xFF, 0}
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| 5 |
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| 6 | static PyObject *
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| 7 | OSError_from_HALError(const char *failed_operation, OSStatus err) {
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| 8 | // these error codes are actually mnemonic, so display them
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| 9 | return PyErr_Format(PyExc_OSError,
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| 10 | "%s failed (%ld - %s)",
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| 11 | failed_operation, (long)err, FourCC2Str(err));
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| 12 | }
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| 13 |
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| 14 | static PyObject *
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| 15 | AudioDevice_default_output_device_is_airplay(PyObject *self, PyObject *args) {
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| 16 | AudioObjectPropertyAddress propertyAddress;
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| 17 | propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
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| 18 | propertyAddress.mElement = kAudioObjectPropertyElementMaster;
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| 19 | propertyAddress.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
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| 20 |
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| 21 | AudioDeviceID deviceID = kAudioDeviceUnknown;
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| 22 | UInt32 size = sizeof(deviceID);
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| 23 | OSStatus err;
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| 24 |
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| 25 | err = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject,
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| 26 | &propertyAddress, 0, NULL,
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| 27 | &size, &deviceID);
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| 28 | if (err != noErr)
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| 29 | return OSError_from_HALError("AudioHardwareServiceGetPropertyData", err);
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| 30 |
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| 31 | if (deviceID == kAudioDeviceUnknown)
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| 32 | Py_RETURN_NONE;
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| 33 |
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| 34 | UInt32 transportType;
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| 35 | propertyAddress.mSelector = kAudioDevicePropertyTransportType,
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| 36 | err = AudioObjectGetPropertyData(deviceID,
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| 37 | &propertyAddress, 0, NULL,
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| 38 | &size, &transportType);
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| 39 | if (err == kAudioHardwareBadObjectError)
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| 40 | Py_RETURN_NONE;
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| 41 | if (err != noErr)
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| 42 | return OSError_from_HALError("AudioObjectGetPropertyData", err);
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| 43 |
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| 44 | if (transportType == kAudioDeviceTransportTypeAirPlay)
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| 45 | Py_RETURN_TRUE;
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| 46 | else
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| 47 | Py_RETURN_FALSE;
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| 48 | }
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| 49 |
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| 50 | static PyObject *default_output_device_changed_callback = NULL;
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| 51 |
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| 52 | OSStatus
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| 53 | output_device_changed_listener(AudioObjectID inObjectID,
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| 54 | UInt32 inNumberAddresses,
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| 55 | const AudioObjectPropertyAddress inAddresses[],
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| 56 | void *inClientData) {
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| 57 | PyGILState_STATE gstate = PyGILState_Ensure();
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| 58 | PyObject_CallObject(default_output_device_changed_callback, NULL);
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| 59 | PyGILState_Release(gstate);
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| 60 |
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| 61 | return noErr;
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| 62 | }
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| 63 |
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| 64 | static PyObject *
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| 65 | AudioDevice_set_default_output_device_changed_callback(PyObject *self,
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| 66 | PyObject *args) {
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| 67 | PyObject *new_callback;
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| 68 | if (!PyArg_ParseTuple(args, "O", &new_callback))
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| 69 | return NULL;
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| 70 |
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| 71 | if (!PyCallable_Check(new_callback)) {
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| 72 | PyErr_SetString(PyExc_TypeError, "parameter must be callable");
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| 73 | return NULL;
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| 74 | }
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| 75 | Py_INCREF(new_callback);
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| 76 | if (default_output_device_changed_callback == NULL) {
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| 77 | AudioObjectPropertyAddress propertyAddress;
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| 78 | propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
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| 79 | propertyAddress.mElement = kAudioObjectPropertyElementMaster;
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| 80 | propertyAddress.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
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| 81 |
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| 82 | OSStatus err;
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| 83 | err = AudioObjectAddPropertyListener(kAudioObjectSystemObject,
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| 84 | &propertyAddress,
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| 85 | &output_device_changed_listener,
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| 86 | NULL);
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| 87 | if (err != noErr)
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| 88 | return OSError_from_HALError("AudioObjectAddPropertyListener", err);
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| 89 | } else {
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| 90 | Py_DECREF(default_output_device_changed_callback);
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| 91 | }
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| 92 | default_output_device_changed_callback = new_callback;
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| 93 |
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| 94 | Py_RETURN_NONE;
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| 95 | }
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| 96 |
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| 97 | static PyMethodDef AudioDevicemodule_methods[] = {
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| 98 | {"default_output_device_is_airplay",
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| 99 | AudioDevice_default_output_device_is_airplay, METH_NOARGS,
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| 100 | "default_output_device() -> bool or None\n\n"
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| 101 | "Return whether the default CoreAudio output device is an AirPlay device."},
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| 102 | {"set_default_output_device_changed_callback",
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| 103 | AudioDevice_set_default_output_device_changed_callback, METH_VARARGS,
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| 104 | "set_default_output_device_changed_callback(callable)\n\n"
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| 105 | "Set a callback invoked when the default CoreAudio output device changes."},
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| 106 | {NULL, NULL, 0, NULL}
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| 107 | };
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| 108 |
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| 109 | PyMODINIT_FUNC
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| 110 | initAudioDevice(void) {
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| 111 | (void)Py_InitModule("AudioDevice", AudioDevicemodule_methods);
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| 112 | }
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