Increase volume on mac using AppleScript? - macos

I found the command, but can I do it in AppleScript?

Yes, you can: use set volume output volume N, where N is an integer from 0 to 100. Since there are 16 squares in the volume interface, and 100/16 = 6.25, there's no direct map from squares to this number, but you'll be fine if you think about it as a percentage. There's also the ability to set the input volume with set volume input volume N, and the alert volume with set volume alert volume N; set volume output muted BOOL mutes the output if BOOL is true, and unmutes it if it's false. (Alternatively, set volume ... with output muted or set volume ... without output muted.) You can stack these if you want to set multiple things at once. As Adam Rosenfield says, there's also set volume R, which (according to my docs) takes a real number between 0 and 7; however, this is deprecated, and has a strange range; I'd just use set volume output volume instead. If you want to query the current volume, you can run get volume settings, which returns a record of the form {output volume:82, input volume:46, alert volume:100, output muted:false}.

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How to change volume on mac using osascript and OpenCV

I'm using a 14 inch M1 Pro Macbook Pro, running Mac OS Monterey 12.6.
I'm making an OpenCV and Mediapipe based Computer Vision Project that allows me to use hand detection to control my Mac's volume. The code detects the distance between the tips of my index finger and thumb using the webcam, and changes the volume based on that. I've been trying to use osascript to set the volume:
osascript.osascript("set volume output volume 0")
It works, but only for hard coded values like 0, 5 and 10. How do I pass a variable value N to osascript:
osascript.osascript("set volume output volume N")
If I could pass that variable value, then I could actually vary the volume instead of having it set at either 0, 5 or 10. The documentation hasn't been very helpful, anybody have any ideas or alternatives instead of osascript?
I've tried applescript but couldn't figure it out.
I'm guessing you are actually using Python, though you don't mention it in the question or in your tags.
If so, you can use an "f-string" like this - note the f at the start:
N = 7
osascript.osascript(f"set volume output volume {N}")
Use command
osascript -e "set Volume 10"
or use python library driver_controler https://github.com/Alexandro1112/driver-controller

How to trigger the Windows volume display?

When the standard keyboard key to increase the volume is hit on windows, a small window appears in the upper left displaying the volume and possibly information about playing media. I am looking for a way to trigger the window without changing the volume status, preferably in an easy to integrate way with Autohotkey.
Windows 8 introduced the Media​Control class that lets Modern apps hook into the system playback control. In Windows 8.1 and 10 it was replaced by the System​Media​Transport​Controls class.
While it supports "Manual control of the System Media Transport Controls" there does not seem to be a way to show/hide the overlay and certainly not from a desktop app.
Going into undocumented territory I found the class name of the overlay and that lead me to HideVolumeOSD. Unfortunately the class names are rather generic so you probably have to look at the size of the window as well to determine if it is the volume overlay.
I don't know if just showing the window will work, Windows is not expecting it to be visible except in response to keyboard and playback events. The HideVolumeOSD app uses keybd_event (volume up/down) to trigger it but this is problematic as noted in the comments...
I set up an autohotkey to send volume up, the volume down (For shortcut ctrl+pgdn).
^PgDn::
Send {Volume_Up}
Send {Volume_Down}
return
The desired behavior when used with volume control keys can be gotten by storing the current volume, sending a media key press, then updating the volume to the stored value +/- 1 (or +0, if just seeking to display the OSD).
There is an edge case when mimicking Volume_Down when the volume is <=3. The sent Volume_Down keypress triggers the mute, but this can be accommodated for by manually setting the mute to be off afterwards, or by pre-setting the volume to 4, which prevents the rounding to 0. Which method to choose depends upon if you prefer a brief blip of potentially louder sound (pre-set to 4) or a brief mute (disable mute afterwards) when the volume is lowered from <=3 values.
The following code is in AHK v2.
; Prefix with '$' so as to prevent self triggering, since internally sending Volume_Up
$Volume_Up::{
; Get the current volume. SoundGetVolume returns a float which often needs rounding
volume:=Round(SoundGetVolume())
; Send the Volume_Up key, so the media display is triggered
Send "{Volume_Up}"
; Indiscriminately set the volume manually to volume+1
SoundSetVolume(volume+1)
}
; Much the same as above, yet when sending Volume_Down at volumes <=3 the volume
; is rounded down to 0 which triggers mute. The volume is then set properly,
; yet remains muted. In order to not hear a cut in the audio, you need to set
; the volume to 4 when (1<volume<=3) so that the Volume_Down doesn't round it
; down to 0, or disable the mute afterwards (if volume > 1). This causes a
; brief volume spike or mute blip, respectively. Currently the volume spike option
; is uncommented.
$Volume_Down::{
volume:=Round(SoundGetVolume())
; Bumping the volume before sending the Volume_Down to prevent mute blip (if needed)
if(1 < volume and volume <= 3){
SoundSetVolume(4)
}
Send "{Volume_Down}"
SoundSetVolume(volume-1)
; ; Disable accidental triggering of mute when volume >= 3 after sending Volume_Down
; if(volume > 1) {
; SoundSetMute(0)
; }
}
To just trigger the OSD as the question asks the following works. Hitting a volume key then quickly resetting the volume will displays it, yet considerations need to be made if currently muted as to prevent a blip of sound. Volume keys are used since double toggling Volume_Mute causes a gap in the sound output.
; Trigger the on screen display of the volume bar by hitting Volume_Up and
; then quickly resetting the volume. If muted and send Volume_Up, we will
; hear audio at original volume for a brief second. To prevent this, we
; can set the volume to 0 and send Volume_Down instead.
^PgUp::{
volume:=Round(SoundGetVolume())
muted:=SoundGetMute()
; Trigger the display with a volume key (might briefly bump the volume if unmuted)
if (muted or volume == 0) {
SoundSetVolume(0)
Send "{Volume_Down}"
} else {
Send "{Volume_Up}"
}
; Reset to the original volume and mute status
SoundSetMute(muted)
SoundSetVolume(volume)
}
All of the same code, yet uncommented:
$Volume_Up::{
volume:=Round(SoundGetVolume())
Send "{Volume_Up}"
SoundSetVolume(volume+1)
}
$Volume_Down::{
volume:=Round(SoundGetVolume())
if(1 < volume and volume <= 3){
SoundSetVolume(4)
}
Send "{Volume_Down}"
SoundSetVolume(volume-1)
}
^PgUp::{
volume:=Round(SoundGetVolume())
muted:=SoundGetMute()
if (muted or volume == 0) {
SoundSetVolume(0)
Send "{Volume_Down}"
} else {
Send "{Volume_Up}"
}
SoundSetMute(muted)
SoundSetVolume(volume)
}
Building on Anna Wang's answer (https://stackoverflow.com/a/62012058/3251466).
This will restore the volume even when it was at an odd value.
^PgDn:: ;Ctrl+Page Down
SoundGet, original_volume
SendInput {Volume_Down}
SoundSet, original_volume
return

FMX Change and mute master volume in OS X

I wrote an FMX (FireMonkey) application and I want to change (increase / decrease) and mute / unmute the master volume output in OS X. Either in Delphi or C++Builder. Alternatively I would do it by simulating key presses of the specific keys of the keyboard.
For Windows, it is fairly easily by simulating key presses with SendInput() or even easier with keybd_event().
This is how it works on windows for me:
// vkVolumeUp / vkVolumeDown / vkVolumeMute
// VK_VOLUME_UP / VK_VOLUME_DOWN / VK_VOLUME_MUTE
keybd_event(vkVolumeUp, 1, 0, 0);
keybd_event(vkVolumeUp, 1, KEYEVENTF_KEYUP, 0);
But I can't manage to compile it for OS X, since the IDE tells me that it doesn't know this functions. A direct way to change the volume would be even better if it is possible.
This is probably a long-winded, inefficient way of doing it, but you can mute the volume from the Terminal like this:
osascript -e 'set volume with output muted'
and increase it by 20 notches like this
osascript -e 'set volume output volume ((output volume of (get volume settings)) + 20)'
I presume you could use the system() command to execute those till someone tells you a better way.

Set specific application volume in AppleScript

I have been trying to use tell application "Google Chrome" to set sound volume to 5 but it gives me error "The variable volume is not defined." number -2753 from "volume". How do I do this?
Chrome doesn't have an application-specific volume setting. You can set the volume for your system with set volume output volume 50, where you can use any integer from 0 to 100.

How to get volume data from an input device in Core-Audio?

I am trying to get the volume of the audio heard by an input device using Core-Audio.
So far I have used AudioDeviceAddIOProc and AudioDeviceStart with my AudioDeviceIOProc function to get the input data in the form of an AudioBufferList containing AudioBuffers.
How do I get the volume of the data from the AudioBuffer? Or am I going about this completely the wrong way?
On Mac OS X 10.5, the APIs you mentioned are deprecated and you should read Tech Note TN2223.
Anyway, assuming that you are getting buffers of linear PCM sample data in 32-bit float format, you just need to write a for loop that determines the fabs(y) of each sample and then takes the max of all those values. Then you can save that value or convert it to decibels.

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