List available output audio target AVAudioSession
I need to list the audio outputs available to an iOS application. My question is similar to this one: How to list available audio output route on iOS
i tried this code:
NSError *setCategoryError = nil;
BOOL success = [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback
error: &setCategoryError];
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
…
NSLog(@"session.currentRoute.outputs count %d", [[[[AVAudioSession sharedInstance] currentRoute] outputs ] count]);
for (AVAudioSessionPortDescription *portDesc in [[[AVAudioSession sharedInstance] currentRoute] outputs ]) {
NSLog(@"-----");
NSLog(@"portDesc UID %@", portDesc.UID);
NSLog(@"portDesc portName %@", portDesc.portName);
NSLog(@"portDesc portType %@", portDesc.portType);
NSLog(@"portDesc channels %@", portDesc.channels);
}
However I always see just one output port (the count is 1), also if I have two (an Airplay and a Built-in speaker). If I use the Music application I am able to see both ports and switch between them. In my app I only see the one that I have selected.
There is something else that I need to do?
Thank you
EDIT:
i tried this code, too:
CFDictionaryRef asCFType = nil;
UInt32 dataSize = sizeof(asCFType);
AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, &asCFType);
NSDictionary *audioRoutesDesc = (__bridge NSDictionary *)asCFType;
NSLog(@"audioRoutesDesc %@", audioRoutesDesc);
but the dictionary list just one output destinations. Moreover the input sources array is empty (I have a iPhone 4s)
EDIT2:
I got something working using MPVolumeView . This component has a button that lets you choose the output audio route, like in the Music App.
If you want you can hide the slider (and have only the button) using:
self.myMPVolumeView.showsVolumeSlider = NO;
Answer
Try something like this, its more than you need but you can pare it down:
+ (NSString *) demonstrateInputSelection
{
NSError* theError = nil;
BOOL result = YES;
NSMutableString *info = [[NSMutableString alloc] init];
[info appendString: @" Device Audio Input Hardware\n"];
NSString *str = nil;
if( iOSMajorVersion < 7 ){
str = @"No input device information available";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
return info;
}
AVAudioSession* myAudioSession = [AVAudioSession sharedInstance];
result = [myAudioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&theError];
if (!result)
{
NSLog(@"setCategory failed");
}
result = [myAudioSession setActive:YES error:&theError];
if (!result)
{
NSLog(@"setActive failed");
}
// Get the set of available inputs. If there are no audio accessories attached, there will be
// only one available input -- the built in microphone.
NSArray* inputs = [myAudioSession availableInputs];
str = [NSString stringWithFormat:@"\n--- Ports available on %@: %d ---", [UIDevice currentDevice].name , [inputs count]];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
// Locate the Port corresponding to the built-in microphone.
AVAudioSessionPortDescription* builtInMicPort = nil;
AVAudioSessionDataSourceDescription* frontDataSource = nil;
for (AVAudioSessionPortDescription* port in inputs)
{
// Print out a description of the data sources for the built-in microphone
str = @"\n**********";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Port :\"%@\": UID:%@", port.portName, port.UID ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
str = [NSString stringWithFormat:@">%@", port.dataSources];
NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
if( [port.portType isEqualToString:AVAudioSessionPortLineIn] ){
str = @"Line Input found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if( [port.portType isEqualToString:AVAudioSessionPortUSBAudio] ){
str = @"USB Audio found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if ([port.portType isEqualToString:AVAudioSessionPortBuiltInMic]){
builtInMicPort = port;
str = @"Built-in Mic found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if ([port.portType isEqualToString:AVAudioSessionPortHeadsetMic]){
builtInMicPort = port;
str = @"Headset Mic found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else{
str = @"Other input source found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
// loop over the built-in mic's data sources and attempt to locate the front microphone
for (AVAudioSessionDataSourceDescription* source in port.dataSources)
{
str = [NSString stringWithFormat:@"\nName:%@ (%d) \nPolar:%@ \nType:%@ \nPatterns:%@", source.dataSourceName, [source.dataSourceID intValue], source.selectedPolarPattern, port.portType, source.supportedPolarPatterns];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
// if ([source.orientation isEqual:AVAudioSessionOrientationFront])
// {
// frontDataSource = source;
// break;
// }
} // end data source iteration
}
str = @"\n---- Current Selected Ports ----\n";
NSLog(@"%@",str);
[info appendFormat:@"%@",str];
NSArray *currentInputs = myAudioSession.currentRoute.inputs;
// str = [NSString stringWithFormat:@"\n%d current input ports", [currentInputs count]];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
for( AVAudioSessionPortDescription *port in currentInputs ){
str = [NSString stringWithFormat:@"\nInput Port :\"%@\":", port.portName ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Selected data source:%@", port.selectedDataSource.dataSourceName];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.selectedDataSource.supportedPolarPatterns count] > 0 ){
str = [NSString stringWithFormat:@"Selected polar pattern:%@", port.selectedDataSource.selectedPolarPattern];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
}
}
NSArray *currentOutputs = myAudioSession.currentRoute.outputs;
// str = [NSString stringWithFormat:@"\n%d current output ports", [currentOutputs count]];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
for( AVAudioSessionPortDescription *port in currentOutputs ){
str = [NSString stringWithFormat:@"\nOutput Port :\"%@\":", port.portName ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Selected data source:%@", port.selectedDataSource.dataSourceName];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
}
// str = [NSString stringWithFormat:@"\Current Route: %@ Source:%@\n", myAudioSession.currentRoute.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
if( myAudioSession.preferredInput.portName ){
str = [NSString stringWithFormat:@"\nPreferred Port: %@ Source:%@\n", myAudioSession.preferredInput.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
} else {
str = @"\nNo Preferred Port set";
}
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
return info;
if (frontDataSource)
{
NSLog(@"Currently selected source is \"%@\" for port \"%@\"", builtInMicPort.selectedDataSource.dataSourceName, builtInMicPort.portName);
NSLog(@"Attempting to select source \"%@\" on port \"%@\"", frontDataSource, builtInMicPort.portName);
// Set a preference for the front data source.
theError = nil;
result = [builtInMicPort setPreferredDataSource:frontDataSource error:&theError];
if (!result)
{
// an error occurred. Handle it!
NSLog(@"setPreferredDataSource failed");
}
}
// Make sure the built-in mic is selected for input. This will be a no-op if the built-in mic is
// already the current input Port.
theError = nil;
result = [myAudioSession setPreferredInput:builtInMicPort error:&theError];
if (!result)
{
// an error occurred. Handle it!
NSLog(@"setPreferredInput failed");
}
return info;
}