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Add get volume option
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@tomcartwrightuk
tomcartwrightuk committed Jan 27, 2022
1 parent 99e9e6e commit c11fdd3
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Showing 2 changed files with 87 additions and 32 deletions.
114 changes: 82 additions & 32 deletions AdjustVolume/AdjustVolume/adjust_volume.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -14,24 +14,26 @@ int startVolumeAdjuster(int argc, const char * argv[]) {
int functionType = 0;
char deviceName[256];
Float32 newVolume = -1.0;

// No arguments found, show help muni
if (argc < 2) {
showHelpMenu();
return 1;
}

static struct option long_options[] = {
{"help", no_argument, NULL, 'h'},
{"device-name", required_argument, NULL, 'n'},
{"get", no_argument, NULL, 'g'},
{"increment", no_argument, NULL, 'i'},
{"decrement", no_argument, NULL, 'd'},
{"set", required_argument, NULL, 's'},
{"copy", required_argument, NULL, 'c'},
{"mute", no_argument, NULL, 'm'},
{NULL, 0, NULL, 0}
};
while ((opt = getopt_long(argc, (char **) argv, "hn:ids:m", long_options, NULL)) != -1) {

while ((opt = getopt_long(argc, (char **) argv, "hn:gids:m", long_options, NULL)) != -1) {
switch (opt) {
case 'h':
showHelpMenu();
Expand All @@ -40,6 +42,11 @@ int startVolumeAdjuster(int argc, const char * argv[]) {
case 'n':
strcpy(deviceName, optarg);
break;
case 'g':
if (selected == 1) return multipleOptionError();
selected = 1;
functionType = kGetVolume;
break;
case 'i':
if (selected == 1) return multipleOptionError();
selected = 1;
Expand All @@ -56,6 +63,12 @@ int startVolumeAdjuster(int argc, const char * argv[]) {
functionType = kSetVolume;
newVolume = atof(optarg);
break;
case 'c':
if (selected == 1) return multipleOptionError();
selected = 1;
functionType = kCopyVolume;
newVolume = atof(optarg);
break;
case 'm':
if (selected == 1) return multipleOptionError();
selected = 1;
Expand All @@ -66,60 +79,72 @@ int startVolumeAdjuster(int argc, const char * argv[]) {
break;
}
}

// No device name found
if (strlen(deviceName) == 0) {
printf("-n flag is required, please enter a device name.\n");
return 1;
}

// No function argument given
if (functionType == 0) {
printf("No function selected. Please select one function to adjust the volume (-i, -d, -s, -m).\n");
printf("No function selected. Please select one function to adjust the volume (-i, -d, -s, -g, -m).\n");
return 1;
}

AudioDeviceID deviceID = getDeviceID(deviceName);

if (deviceID == kAudioDeviceUnknown) {
printf("Device name not found.\n");
return 1;
}

// Property address of volume level, used for getting/setting volume
AudioObjectPropertyAddress volumeAddress = {
kAudioHardwareServiceDeviceProperty_VirtualMasterVolume,
kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMaster
};

// Property address of mute value
AudioObjectPropertyAddress muteAddress = {
kAudioDevicePropertyMute,
kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMaster
};

int muted = isMuted(deviceID, muteAddress);

if (functionType == kIncrementVolume || functionType == kDecrementVolume) {
newVolume = getNewVolume(deviceID, functionType, volumeAddress);
}


if (functionType == kGetVolume) {
// AudioObjectPropertyAddress deviceIdAddress = {
// kAudioHardwareServiceDeviceProperty_VirtualMasterVolume,
// kAudioDevicePropertyScopeOutput,
// kAudioObjectPropertyElementMaster
// };
// AudioDeviceID currentDeviceID = getCurrentlySelectedOutputID(deviceIdAddress);

getVolume(deviceID, functionType, volumeAddress);
return 0;
}

if (functionType == kMuteVolume) {
mute(deviceID, !muted, muteAddress);
} else {
setVolume(deviceID, newVolume, volumeAddress);

if (muted && newVolume > 0) {
mute(deviceID, 0, muteAddress);
}

if (!muted && newVolume <= 0) {
mute(deviceID, 1, muteAddress);
}
}

return 0;
}

Expand All @@ -130,6 +155,7 @@ void showHelpMenu() {
" -i --increment Increment volume by one step.\n"
" -d --decrement Decrement volume by one step.\n"
" -s --set volume-level Set volume to desired level (value between 0 and 1).\n"
" -g --get Get the volume of the device (value between 0 and 1)."
" -m --mute Mutes/unmutes device.\n"
" -n --device-name The device you would like to adjust the volume of.\n");
}
Expand All @@ -143,56 +169,57 @@ AudioDeviceID getDeviceID(char * deviceName) {
UInt32 propertySize;
int numberOfDevices = 0;
AudioObjectID defaultID = kAudioObjectSystemObject;

// Get address for all hardware devices
AudioObjectPropertyAddress devicesAddress = {
kAudioHardwarePropertyDevices,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster };

// Retreive property size within devices address
AudioObjectGetPropertyDataSize(defaultID, &devicesAddress, 0, nil, &propertySize);

numberOfDevices = propertySize / sizeof(AudioObjectID);
AudioDeviceID ids[numberOfDevices];

// Populate ids from devices address
AudioObjectGetPropertyData(defaultID, &devicesAddress, 0, nil, &propertySize, ids);

for (int i = 0; i < numberOfDevices; i++) {
UInt32 nameSize = 256;
char name[nameSize];

AudioObjectPropertyAddress deviceNameAddress = {
kAudioDevicePropertyDeviceName,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMaster };

// Get device name from id
AudioObjectGetPropertyData(ids[i], &deviceNameAddress, 0, nil, &nameSize, (char *) name);

// Check if names match
//printf("%s\n", name);
if (strcmp(deviceName, (char *) name) == 0) {
return ids[i];
}
}

return kAudioDeviceUnknown;
}

int isMuted(AudioDeviceID deviceID, AudioObjectPropertyAddress propertyAddress) {
UInt32 muted = 0;
UInt32 muteSize = sizeof(muted);

// Get current mute value
AudioObjectGetPropertyData(deviceID, &propertyAddress, 0, nil, &muteSize, &muted);

return muted;
}

void mute(AudioDeviceID deviceID, int muteValue, AudioObjectPropertyAddress propertyAddress) {
UInt32 muteSize = sizeof(muteValue);

// Set new mute value
AudioObjectSetPropertyData(deviceID, &propertyAddress, 0, nil, muteSize, &muteValue);
}
Expand All @@ -201,10 +228,10 @@ Float32 getNewVolume(AudioDeviceID deviceID, FunctionType type, AudioObjectPrope
Float32 volume;
UInt32 volumeSize = sizeof(volume);
Float32 incLevel = 1.0 / 16.0;

// Get current volume level for requested device
AudioObjectGetPropertyData(deviceID, &propertyAddress, 0, nil, &volumeSize, &volume);

switch (type) {
case kIncrementVolume:
return volume + incLevel;
Expand All @@ -217,9 +244,32 @@ Float32 getNewVolume(AudioDeviceID deviceID, FunctionType type, AudioObjectPrope
}
}

Float32 getVolume(AudioDeviceID deviceID, FunctionType type, AudioObjectPropertyAddress propertyAddress) {
Float32 volume;
UInt32 volumeSize = sizeof(volume);

// Get current volume level for requested device
AudioObjectGetPropertyData(deviceID, &propertyAddress, 0, nil, &volumeSize, &volume);
printf("%f", volume);
return volume;
}

void setVolume(AudioDeviceID deviceID, Float32 volume, AudioObjectPropertyAddress propertyAddress) {
printf("Setting volume for reasons");
UInt32 volumeSize = sizeof(volume);

// Set new volume level
AudioObjectSetPropertyData(deviceID, &propertyAddress, 0, nil, volumeSize, &volume);
}

AudioDeviceID getCurrentlySelectedOutputID(AudioObjectPropertyAddress propertyAddress) {
UInt32 propertySize;
AudioDeviceID deviceID = kAudioDeviceUnknown;
UInt32 deviceIdSize = sizeof(deviceID);

// get the default output device
propertySize = sizeof(deviceID);
AudioObjectGetPropertyData(kAudioHardwarePropertyDefaultOutputDevice, &propertyAddress, 0, nil, &deviceIdSize, &deviceID);

return deviceID;
}
5 changes: 5 additions & 0 deletions AdjustVolume/AdjustVolume/adjust_volume.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ typedef enum {
kDecrementVolume = 2,
kSetVolume = 3,
kMuteVolume = 4,
kGetVolume = 5,
kCopyVolume = 6,
} FunctionType;

int startVolumeAdjuster(int argc, const char * argv[]);
Expand All @@ -33,4 +35,7 @@ AudioDeviceID getDeviceID(char * deviceName);
int isMuted(AudioDeviceID deviceID, AudioObjectPropertyAddress propertyAddress);
void mute(AudioDeviceID deviceID, int muteValue, AudioObjectPropertyAddress propertyAddress);
Float32 getNewVolume(AudioDeviceID deviceID, FunctionType type, AudioObjectPropertyAddress propertyAddress);
Float32 getVolume(AudioDeviceID deviceID, FunctionType type, AudioObjectPropertyAddress propertyAddress);
void setVolume(AudioDeviceID deviceID, Float32 volumeLevel, AudioObjectPropertyAddress propertyAddress);
void copyVolume(AudioDeviceID deviceID, Float32 volumeLevel, AudioObjectPropertyAddress propertyAddress);
AudioDeviceID getCurrentlySelectedOutputID(AudioObjectPropertyAddress propertyAddress);

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