To answer brush51’s question: How can i do that? just change the DEVICE volume? As 0x7fffffff suggested: You cannot change device volume programatically, however MPVolumeView (volume slider) is there to change device volume but only through user interaction. So, Apple recommends using MPVolumeView, so I came up with this: Add volumeSlider property: @property (nonatomic, strong) … Read more
Starting with Vista you have to use the Core Audio API to control the system volume. It’s a COM API that doesn’t support automation and thus requires a lot of boilerplate to use from .NET and PowerShell. Anyways the code bellow let you access the [Audio]::Volume and [Audio]::Mute properties from PowerShell. This also work on … Read more
Okay, here goes: const int MAXPNAMELEN = 32; const int MIXER_SHORT_NAME_CHARS = 16; const int MIXER_LONG_NAME_CHARS = 64; [Flags] enum MIXERLINE_LINEF : uint{ ACTIVE = 0x00000001, DISCONNECTED = 0x00008000, SOURCE = 0x80000000 } [Flags] enum MIXER : uint{ GETLINEINFOF_DESTINATION = 0x00000000, GETLINEINFOF_SOURCE = 0x00000001, GETLINEINFOF_LINEID = 0x00000002, GETLINEINFOF_COMPONENTTYPE = 0x00000003, GETLINEINFOF_TARGETTYPE = 0x00000004, GETLINEINFOF_QUERYMASK = … Read more
For Swift you can use next code in your viewController class: let volumeView = MPVolumeView(frame: CGRectMake(-CGFloat.max, 0.0, 0.0, 0.0)) self.view.addSubview(volumeView) NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(volumeChanged(_:)), name: “AVSystemController_SystemVolumeDidChangeNotification”, object: nil) Then add this function func volumeChanged(notification: NSNotification) { if let userInfo = notification.userInfo { if let volumeChangeType = userInfo[“AVSystemController_AudioVolumeChangeReasonNotificationParameter”] as? String { if volumeChangeType == “ExplicitVolumeChange” { // … Read more
Update for Swift let vol = AVAudioSession.sharedInstance().outputVolume The audio session can provide output volume (iOS >= 6.0). float vol = [[AVAudioSession sharedInstance] outputVolume]; NSLog(@”output volume: %1.2f dB”, 20.f*log10f(vol+FLT_MIN));
Any chance you did your signature wrong for the volumeChanged: method? This worked for me, dumped in my appdelegate: – (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(volumeChanged:) name:@”AVSystemController_SystemVolumeDidChangeNotification” object:nil]; } – (void)volumeChanged:(NSNotification *)notification { float volume = [[[notification userInfo] objectForKey:@”AVSystemController_AudioVolumeNotificationParameter”] floatValue]; // Do stuff with volume } My volumeChanged: method gets hit every … Read more
Just to elaborate on my comment above, matplotlib’s 3D plotting really isn’t intended for something as complex as isosurfaces. It’s meant to produce nice, publication-quality vector output for really simple 3D plots. It can’t handle complex 3D polygons, so even if implemented marching cubes yourself to create the isosurface, it wouldn’t render it properly. However, … Read more
To answer you question exactly: Yes there is other way to change system volume without user interaction. Until recent times I used to think that changing volume using MPVolumeView programmatically is possible only using private API. But I have just verified, that changing the value of volumeSlider and faking slider’s touchUP event works: MPVolumeView* volumeView … Read more
Reading this paper, it is actually a pretty simple calculation. The trick is to calculate the signed volume of a tetrahedron – based on your triangle and topped off at the origin. The sign of the volume comes from whether your triangle is pointing in the direction of the origin. (The normal of the triangle … Read more
There is no broadcast action, but I did find you can hook up a content observer to get notified when the settings change, volume of streams being some of those settings. Register for the android.provider.Settings.System.CONTENT_URI to be notified of all settings changes: mSettingsContentObserver = new SettingsContentObserver( new Handler() ); this.getApplicationContext().getContentResolver().registerContentObserver( android.provider.Settings.System.CONTENT_URI, true, mSettingsContentObserver ); The … Read more