static AudioChannelLayout* ca_query_layout(struct ao *ao,
AudioDeviceID device,
void *talloc_ctx)
{
OSStatus err;
uint32_t psize;
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelLayout,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
err = AudioObjectGetPropertyDataSize(device, &p_addr, 0, NULL, &psize);
CHECK_CA_ERROR("could not get device preferred layout (size)");
r = talloc_size(talloc_ctx, psize);
err = AudioObjectGetPropertyData(device, &p_addr, 0, NULL, &psize, r);
CHECK_CA_ERROR("could not get device preferred layout (get)");
coreaudio_error:
return r;
}
OSStatus ca_select_device(struct ao *ao, char* name, AudioDeviceID *device)
{
OSStatus err = noErr;
int selection = name ? strtol(name, (char **)NULL, 10) : -1;
if (errno == EINVAL || errno == ERANGE) {
selection = -1;
MP_WARN(ao, "device identifier '%s' is invalid\n", name);
}
*device = 0;
if (selection < 0) {
// device not set by user, get the default one
err = CA_GET(kAudioObjectSystemObject,
kAudioHardwarePropertyDefaultOutputDevice,
device);
CHECK_CA_ERROR("could not get default audio device");
} else {
*device = selection;
}
if (mp_msg_test(ao->log, MSGL_V)) {
char *desc;
err = CA_GET_STR(*device, kAudioObjectPropertyName, &desc);
CHECK_CA_ERROR("could not get selected audio device name");
MP_VERBOSE(ao, "selected audio output device: %s (%" PRIu32 ")\n",
desc, *device);
talloc_free(desc);
}
coreaudio_error:
return err;
}
static int64_t ca_get_hardware_latency(struct ao *ao) {
struct priv *p = ao->priv;
double audiounit_latency_sec = 0.0;
uint32_t size = sizeof(audiounit_latency_sec);
OSStatus err = AudioUnitGetProperty(
p->audio_unit,
kAudioUnitProperty_Latency,
kAudioUnitScope_Global,
0,
&audiounit_latency_sec,
&size);
CHECK_CA_ERROR("cannot get audio unit latency");
uint32_t frames = 0;
err = CA_GET_O(p->device, kAudioDevicePropertyLatency, &frames);
CHECK_CA_ERROR("cannot get device latency");
uint64_t audiounit_latency_us = audiounit_latency_sec * 1e6;
uint64_t device_latency_us = ca_frames_to_us(ao, frames);
MP_VERBOSE(ao, "audiounit latency [us]: %lld\n", audiounit_latency_us);
MP_VERBOSE(ao, "device latency [us]: %lld\n", device_latency_us);
return audiounit_latency_us + device_latency_us;
coreaudio_error:
return 0;
}
static AudioChannelLayout* ca_query_stereo_layout(struct ao *ao,
AudioDeviceID device,
void *talloc_ctx)
{
OSStatus err;
const int nch = 2;
uint32_t channels[nch];
AudioChannelLayout *r = NULL;
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioDevicePropertyPreferredChannelsForStereo,
.mScope = kAudioDevicePropertyScopeOutput,
.mElement = kAudioObjectPropertyElementWildcard,
};
uint32_t psize = sizeof(channels);
err = AudioObjectGetPropertyData(device, &p_addr, 0, NULL, &psize, channels);
CHECK_CA_ERROR("could not get device preferred stereo layout");
psize = sizeof(AudioChannelLayout) + nch * sizeof(AudioChannelDescription);
r = talloc_zero_size(talloc_ctx, psize);
r->mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
r->mNumberChannelDescriptions = nch;
AudioChannelDescription desc = {0};
desc.mChannelFlags = kAudioChannelFlags_AllOff;
for(int i = 0; i < nch; i++) {
desc.mChannelLabel = channels[i];
r->mChannelDescriptions[i] = desc;
}
coreaudio_error:
return r;
}
void ca_get_device_list(struct ao *ao, struct ao_device_list *list)
{
AudioDeviceID *devs;
size_t n_devs;
OSStatus err =
CA_GET_ARY(kAudioObjectSystemObject, kAudioHardwarePropertyDevices,
&devs, &n_devs);
CHECK_CA_ERROR("Failed to get list of output devices.");
for (int i = 0; i < n_devs; i++) {
if (!ca_is_output_device(ao, devs[i]))
continue;
void *ta_ctx = talloc_new(NULL);
char *name;
char *desc;
err = CA_GET_STR(devs[i], kAudioDevicePropertyDeviceUID, &name);
if (err != noErr) {
MP_VERBOSE(ao, "skipping device %d, which has no UID\n", i);
talloc_free(ta_ctx);
continue;
}
talloc_steal(ta_ctx, name);
err = CA_GET_STR(devs[i], kAudioObjectPropertyName, &desc);
if (err != noErr)
desc = talloc_strdup(NULL, "Unknown");
talloc_steal(ta_ctx, desc);
ao_device_list_add(list, ao, &(struct ao_device_desc){name, desc});
talloc_free(ta_ctx);
}
static bool reinit_device(struct ao *ao) {
struct priv *p = ao->priv;
OSStatus err = ca_select_device(ao, ao->device, &p->device);
CHECK_CA_ERROR("failed to select device");
char *uid;
err = CA_GET_STR(p->device, kAudioDevicePropertyDeviceUID, &uid);
CHECK_CA_ERROR("failed to get device UID");
ao->detected_device = talloc_steal(ao, uid);
return true;
coreaudio_error:
return false;
}
static void init_physical_format(struct ao *ao)
{
struct priv *p = ao->priv;
OSErr err;
AudioStreamBasicDescription asbd;
ca_fill_asbd(ao, &asbd);
AudioStreamID *streams;
size_t n_streams;
err = CA_GET_ARY_O(p->device, kAudioDevicePropertyStreams,
&streams, &n_streams);
CHECK_CA_ERROR("could not get number of streams");
for (int i = 0; i < n_streams; i++) {
AudioStreamRangedDescription *formats;
size_t n_formats;
err = CA_GET_ARY(streams[i],
kAudioStreamPropertyAvailablePhysicalFormats,
&formats, &n_formats);
if (!CHECK_CA_WARN("could not get number of stream formats"))
continue; // try next one
MP_VERBOSE(ao, "Looking at formats in substream %d...\n", i);
AudioStreamBasicDescription best_asbd = {0};
for (int j = 0; j < n_formats; j++) {
AudioStreamBasicDescription *stream_asbd = &formats[j].mFormat;
ca_print_asbd(ao, "- ", stream_asbd);
if (!best_asbd.mFormatID || ca_asbd_is_better(&asbd, &best_asbd,
stream_asbd))
best_asbd = *stream_asbd;
}
if (best_asbd.mFormatID) {
p->original_asbd_stream = streams[i];
err = CA_GET(p->original_asbd_stream,
kAudioStreamPropertyPhysicalFormat,
&p->original_asbd);
CHECK_CA_WARN("could not get current physical stream format");
ca_change_physical_format_sync(ao, streams[i], best_asbd);
break;
}
}
coreaudio_error:
return;
}
static AudioChannelLayout *ca_layout_to_custom_layout(struct ao *ao,
void *talloc_ctx,
AudioChannelLayout *l)
{
AudioChannelLayoutTag tag = l->mChannelLayoutTag;
AudioChannelLayout *r;
OSStatus err;
if (tag == kAudioChannelLayoutTag_UseChannelDescriptions)
return l;
if (tag == kAudioChannelLayoutTag_UseChannelBitmap) {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (info)");
r = talloc_size(NULL, psize);
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForBitmap,
sizeof(uint32_t), &l->mChannelBitmap, &psize, r);
CHECK_CA_ERROR("failed to convert channel bitmap to descriptions (get)");
} else {
uint32_t psize;
err = AudioFormatGetPropertyInfo(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize);
r = talloc_size(NULL, psize);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (info)");
err = AudioFormatGetProperty(
kAudioFormatProperty_ChannelLayoutForTag,
sizeof(AudioChannelLayoutTag), &l->mChannelLayoutTag, &psize, r);
CHECK_CA_ERROR("failed to convert channel tag to descriptions (get)");
}
MP_VERBOSE(ao, "converted input channel layout:\n");
ca_log_layout(ao, MSGL_V, l);
return r;
coreaudio_error:
return NULL;
}
static int set_volume(struct ao *ao, struct ao_control_vol *vol) {
struct priv *p = ao->priv;
float auvol = (vol->left + vol->right) / 200.0;
OSStatus err =
AudioUnitSetParameter(p->audio_unit, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, auvol, 0);
CHECK_CA_ERROR("could not set HAL output volume");
return CONTROL_TRUE;
coreaudio_error:
return CONTROL_ERROR;
}
void ca_get_device_list(struct ao *ao, struct ao_device_list *list)
{
AudioDeviceID *devs;
size_t n_devs;
OSStatus err =
CA_GET_ARY(kAudioObjectSystemObject, kAudioHardwarePropertyDevices,
&devs, &n_devs);
CHECK_CA_ERROR("Failed to get list of output devices.");
for (int i = 0; i < n_devs; i++) {
char name[32];
char *desc;
sprintf(name, "%d", devs[i]);
err = CA_GET_STR(devs[i], kAudioObjectPropertyName, &desc);
if (err != noErr)
desc = "Unknown";
ao_device_list_add(list, ao, &(struct ao_device_desc){name, desc});
}
bool ca_device_supports_digital(struct ao *ao, AudioDeviceID device)
{
AudioStreamID *streams = NULL;
size_t n_streams;
/* Retrieve all the output streams. */
OSStatus err =
CA_GET_ARY_O(device, kAudioDevicePropertyStreams, &streams, &n_streams);
CHECK_CA_ERROR("could not get number of streams.");
for (int i = 0; i < n_streams; i++) {
if (ca_stream_supports_digital(ao, streams[i])) {
talloc_free(streams);
return true;
}
}
talloc_free(streams);
coreaudio_error:
return false;
}
OSStatus ca_select_device(struct ao *ao, char* name, AudioDeviceID *device)
{
OSStatus err = noErr;
*device = kAudioObjectUnknown;
if (name && name[0]) {
CFStringRef uid = cfstr_from_cstr(name);
AudioValueTranslation v = (AudioValueTranslation) {
.mInputData = &uid,
.mInputDataSize = sizeof(CFStringRef),
.mOutputData = device,
.mOutputDataSize = sizeof(*device),
};
uint32_t size = sizeof(AudioValueTranslation);
AudioObjectPropertyAddress p_addr = (AudioObjectPropertyAddress) {
.mSelector = kAudioHardwarePropertyDeviceForUID,
.mScope = kAudioObjectPropertyScopeGlobal,
.mElement = kAudioObjectPropertyElementMaster,
};
err = AudioObjectGetPropertyData(
kAudioObjectSystemObject, &p_addr, 0, 0, &size, &v);
CFRelease(uid);
CHECK_CA_ERROR("unable to query for device UID");
} else {
bool ca_stream_supports_digital(struct ao *ao, AudioStreamID stream)
{
AudioStreamRangedDescription *formats = NULL;
size_t n_formats;
OSStatus err =
CA_GET_ARY(stream, kAudioStreamPropertyAvailablePhysicalFormats,
&formats, &n_formats);
CHECK_CA_ERROR("Could not get number of stream formats.");
for (int i = 0; i < n_formats; i++) {
AudioStreamBasicDescription asbd = formats[i].mFormat;
ca_print_asbd(ao, "supported format:", &(asbd));
if (ca_format_is_digital(asbd)) {
talloc_free(formats);
return true;
}
}
talloc_free(formats);
coreaudio_error:
return false;
}
static bool init_audiounit(struct ao *ao, AudioStreamBasicDescription asbd)
{
OSStatus err;
uint32_t size;
struct priv *p = ao->priv;
AudioComponentDescription desc = (AudioComponentDescription) {
.componentType = kAudioUnitType_Output,
.componentSubType = (ao->device) ?
kAudioUnitSubType_HALOutput :
kAudioUnitSubType_DefaultOutput,
.componentManufacturer = kAudioUnitManufacturer_Apple,
.componentFlags = 0,
.componentFlagsMask = 0,
};
AudioComponent comp = AudioComponentFindNext(NULL, &desc);
if (comp == NULL) {
MP_ERR(ao, "unable to find audio component\n");
goto coreaudio_error;
}
err = AudioComponentInstanceNew(comp, &(p->audio_unit));
CHECK_CA_ERROR("unable to open audio component");
err = AudioUnitInitialize(p->audio_unit);
CHECK_CA_ERROR_L(coreaudio_error_component,
"unable to initialize audio unit");
size = sizeof(AudioStreamBasicDescription);
err = AudioUnitSetProperty(p->audio_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, &asbd, size);
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"unable to set the input format on the audio unit");
err = AudioUnitSetProperty(p->audio_unit,
kAudioOutputUnitProperty_CurrentDevice,
kAudioUnitScope_Global, 0, &p->device,
sizeof(p->device));
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"can't link audio unit to selected device");
p->hw_latency_us = ca_get_hardware_latency(ao);
AURenderCallbackStruct render_cb = (AURenderCallbackStruct) {
.inputProc = render_cb_lpcm,
.inputProcRefCon = ao,
};
err = AudioUnitSetProperty(p->audio_unit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0, &render_cb,
sizeof(AURenderCallbackStruct));
CHECK_CA_ERROR_L(coreaudio_error_audiounit,
"unable to set render callback on audio unit");
return true;
coreaudio_error_audiounit:
AudioUnitUninitialize(p->audio_unit);
coreaudio_error_component:
AudioComponentInstanceDispose(p->audio_unit);
coreaudio_error:
return false;
}
static void stop(struct ao *ao)
{
struct priv *p = ao->priv;
OSStatus err = AudioOutputUnitStop(p->audio_unit);
CHECK_CA_WARN("can't stop audio unit");
}
static void start(struct ao *ao)
{
struct priv *p = ao->priv;
OSStatus err = AudioOutputUnitStart(p->audio_unit);
CHECK_CA_WARN("can't start audio unit");
}
static void uninit(struct ao *ao)
{
struct priv *p = ao->priv;
AudioOutputUnitStop(p->audio_unit);
AudioUnitUninitialize(p->audio_unit);
AudioComponentInstanceDispose(p->audio_unit);
if (p->original_asbd.mFormatID) {
OSStatus err = CA_SET(p->original_asbd_stream,
kAudioStreamPropertyPhysicalFormat,
&p->original_asbd);
CHECK_CA_WARN("could not restore physical stream format");
}
}
static OSStatus hotplug_cb(AudioObjectID id, UInt32 naddr,
const AudioObjectPropertyAddress addr[],
void *ctx) {
reinit_device(ctx);
ao_hotplug_event(ctx);
return noErr;
}
