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// bar-volumed — volume daemon for bar (no permissions needed)
//
// Uses CoreAudio to listen for system volume/mute changes instead of
// a CGEvent tap, so no Accessibility permission is required.
//
// When the volume changes, it posts a Darwin notification that tells
// bar to refresh the "volume" block.
//
// ── Setup ──
//
// 1. Add a volume block to Config (no interval needed):
// Block(name: "volume", placement: .right, command: "<your-volume-script>")
//
// 2. Compile and run the daemon:
// cc -o ~/.local/bin/bar-volumed daemons/volume/volumed.c -framework CoreAudio
// ~/.local/bin/bar-volumed &
//
// 3. Or install as a luanch agent:
// cp daemons/volume/house.panini.bar.volumed.plist ~/Library/LaunchAgents/
// # Make sure to update the ProgramArguments with the correct path to the program
// launchctl load ~/Library/LaunchAgents/house.panini.bar.volumed.plist
//
// Compile:
// cc -o bar-volumed daemons/volume/volumed.c -framework CoreAudio
#include <CoreAudio/CoreAudio.h>
#include <notify.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static volatile int keep_running = 1;
static void handle_signal(int sig) {
(void)sig;
keep_running = 0;
}
// ── Volume change callback ───────────────────────────────────────────
static OSStatus volume_changed(
AudioObjectID object,
UInt32 num_addresses,
const AudioObjectPropertyAddress addresses[],
void *context
) {
(void)object; (void)num_addresses; (void)addresses; (void)context;
notify_post("bar.touch.volume");
return noErr;
}
// ── Device change callback ───────────────────────────────────────────
// Re-registers the volume listener when the output device changes
// (e.g. headphones plugged in).
static AudioDeviceID current_device = kAudioObjectUnknown;
static void register_volume_listener(AudioDeviceID device);
static OSStatus device_changed(
AudioObjectID object,
UInt32 num_addresses,
const AudioObjectPropertyAddress addresses[],
void *context
) {
(void)object; (void)num_addresses; (void)addresses; (void)context;
AudioObjectPropertyAddress addr = {
kAudioHardwarePropertyDefaultOutputDevice,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMain
};
AudioDeviceID new_device = kAudioObjectUnknown;
UInt32 size = sizeof(new_device);
AudioObjectGetPropertyData(
kAudioObjectSystemObject, &addr, 0, NULL, &size, &new_device);
if (new_device != current_device && new_device != kAudioObjectUnknown) {
register_volume_listener(new_device);
}
return noErr;
}
// ── Register listener on a device ────────────────────────────────────
static void register_volume_listener(AudioDeviceID device) {
// Remove old listener if any
if (current_device != kAudioObjectUnknown) {
AudioObjectPropertyAddress old_addr = {
kAudioDevicePropertyVolumeScalar,
kAudioDevicePropertyScopeOutput,
1 // channel 1
};
AudioObjectRemovePropertyListener(
current_device, &old_addr, volume_changed, NULL);
}
current_device = device;
// Get the preferred stereo channel (usually 1)
UInt32 channel = 1;
AudioObjectPropertyAddress chan = {
kAudioDevicePropertyPreferredChannelsForStereo,
kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMain
};
UInt32 channels[2] = {0, 0};
UInt32 size = sizeof(channels);
if (AudioObjectGetPropertyData(device, &chan, 0, NULL, &size, &channels) == noErr) {
channel = channels[0];
}
// Listen for volume changes on the main output channel
AudioObjectPropertyAddress vol_addr = {
kAudioDevicePropertyVolumeScalar,
kAudioDevicePropertyScopeOutput,
channel
};
AudioObjectAddPropertyListener(device, &vol_addr, volume_changed, NULL);
// Also listen for mute changes
AudioObjectPropertyAddress mute_addr = {
kAudioDevicePropertyMute,
kAudioDevicePropertyScopeOutput,
kAudioObjectPropertyElementMain
};
AudioObjectAddPropertyListener(device, &mute_addr, volume_changed, NULL);
}
// ── Main ─────────────────────────────────────────────────────────────
int main(void) {
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
// Listen for output device changes
AudioObjectPropertyAddress dev_addr = {
kAudioHardwarePropertyDefaultOutputDevice,
kAudioObjectPropertyScopeGlobal,
kAudioObjectPropertyElementMain
};
AudioObjectAddPropertyListener(
kAudioObjectSystemObject, &dev_addr, device_changed, NULL);
// Register on the current device
UInt32 size = sizeof(current_device);
AudioObjectGetPropertyData(
kAudioObjectSystemObject, &dev_addr, 0, NULL, &size, ¤t_device);
if (current_device != kAudioObjectUnknown) {
register_volume_listener(current_device);
}
// Run until SIGINT/SIGTERM
while (keep_running) {
pause();
}
// Cleanup
if (current_device != kAudioObjectUnknown) {
AudioObjectPropertyAddress vol_addr = {
kAudioDevicePropertyVolumeScalar,
kAudioDevicePropertyScopeOutput,
1 // channel 1
};
AudioObjectRemovePropertyListener(
current_device, &vol_addr, volume_changed, NULL);
}
return 0;
}
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