When I implement sounds in my apps, I always ge a couple of yellow warning triangles with the warning:
"implicit declaration of function "audio services create system soundID" is invalid in C99"
It doesn't effect anything in my app I just wondered if it's something in my code and something I should be addressing?
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) #"btnclick", CFSTR
("mp3"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID (soundFileURLRef, &soundID);
AudioServicesPlaySystemSound (soundID);
The compiler isn't finding declarations of the AudioServices functions and is complaining about that.
The documentation for those functions says which framework they come from, so an import...
#import <AudioToolbox/AudioToolbox.h>
...should get rid of the warnings.
Related
I'm having trouble using AudioServicesPlaySystemSound. Things work great when output goes through the speakers. However, when a user plugs in headphones, there is no output. Is there an easy way to set up some kind of listener so that audio is automatically routed through the headphones when they are plugged in, and otherwise through the speaker?
I'm using the following method to play short, simple AIF sound samples:
-(void)playAif:(NSString *)filename {
SystemSoundID soundID;
NSString *path = [[NSBundle mainBundle]
pathForResource:filename ofType:#"aif"];
if (path) { // test for path, to guard against crashes
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path],&soundID);
AudioServicesPlaySystemSound (soundID);
}
}
I know I must be missing something, some bit of setup that would do this. Any ideas?
Thanks #Till for pointing me to the relevant portion of the docs. For others with this issue, the solution is to explicitly set the session category, in my case to ambient sound. This code snipped from apple's docs:
UInt32 sessionCategory = kAudioSessionCategory_AmbientSound; // 1
AudioSessionSetProperty (
kAudioSessionProperty_AudioCategory, // 2
sizeof (sessionCategory), // 3
&sessionCategory // 4
);
So, my method for playing audio now looks like this:
-(void)playAif:(NSString *)filename {
// NSLog(#"play: %#", filename);
SystemSoundID soundID;
NSString *path = [[NSBundle mainBundle]
pathForResource:filename ofType:#"aif"];
if (path) { // test for path, to guard against crashes
UInt32 sessionCategory = kAudioSessionCategory_AmbientSound; // 1
AudioSessionSetProperty (
kAudioSessionProperty_AudioCategory, // 2
sizeof (sessionCategory), // 3
&sessionCategory // 4
);
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path],&soundID);
AudioServicesPlaySystemSound (soundID);
}
}
This solves my problem handily! The only worry I have is that setting it explicitly every single time I play a sound might be excessive. Anyone know a better and safer way to set it and forget it? Otherwise, this works delightfully.
I used code below in my application, and if I increase or decrease the volume from the iPhone's button it's still the same, but if the phone is in silent mode the voice will be muted.
The code:
-(void) playNote: (NSString *)Note type: (NSString *)type
{
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
CFBundleRef mainBundle;
mainBundle = CFBundleGetMainBundle ();
// Get the URL to the sound file to play
soundFileURLRef = CFBundleCopyResourceURL (mainBundle,
(CFStringRef)Note,
(CFStringRef)type,
NULL);
NSLog(#"%#\n", soundFileURLRef);
// Create a system sound object representing the sound file
AudioServicesCreateSystemSoundID (soundFileURLRef, &soundFileObject);
AudioServicesPlaySystemSound (soundFileObject);
}
What am I doing wrong?
You need to set your Audio Category properly before playing back sounds.
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (sessionCategory), &sessionCategory);
Hello everyone i need to convert this code to a function with 2 parameters in this case the first parameter is News and the second one aif can u do this ??
-(IBAction)news
{
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
CFBundleRef mainBundle;
mainBundle = CFBundleGetMainBundle ();
// Get the URL to the sound file to play
soundFileURLRef = CFBundleCopyResourceURL (mainBundle,
CFSTR ("News"),
CFSTR ("aif"),
NULL);
// Create a system sound object representing the sound file
AudioServicesCreateSystemSoundID (soundFileURLRef, &soundFileObject);
AudioServicesPlaySystemSound (soundFileObject);
return;
}
If the CFSTR thing is the problem, then the solution is:
-(void) playNews: (NSString*) news type: (NSString*) type
{
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
CFBundleRef mainBundle;
mainBundle = CFBundleGetMainBundle ();
// Get the URL to the sound file to play
soundFileURLRef = CFBundleCopyResourceURL (mainBundle,
(CFStringRef)news,
(CFStringRef)type,
NULL);
// Create a system sound object representing the sound file
AudioServicesCreateSystemSoundID (soundFileURLRef, &soundFileObject);
AudioServicesPlaySystemSound (soundFileObject);
}
But the (IBAction) declaration makes no sense here because this method cannot be directly used from Interface Builder.
If this is meant to be an action received by a class from a user using a control, then the only thing you can do is -(IBAction)nameOfAction:(id)sender;. Otherwise, then you need to write the command to take the two arguments you require and call that from an IBAction.
I'm attempting to output audio to the bluetooth headset (not A2DP) using AVAudioPlayer, AVAudioSession and AudioSessionSetProperty.
There seems to be functions to select the bluetooth headset as input (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput), but no equivalent for setting the output. This is done in the Voicemail app, where you can select the headset, handset speaker or speaker phone. I've tried various combinations of SessionCategories and the AudioSession properties, but I just can't seem to hit on an approach that works.
I'm sure someone has figured this out, care to share an example?
This little test worked for me... it involves setting up the bluetooth headset as the input also (not sure if that's what you want). Sorry about the crappy formatting on the code...
// create and set up the audio session
AVAudioSession* audioSession = [AVAudioSession sharedInstance];
[audioSession setDelegate:self];
[audioSession setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive: YES error: nil];
// set up for bluetooth microphone input
UInt32 allowBluetoothInput = 1;
OSStatus stat = AudioSessionSetProperty (
kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
sizeof (allowBluetoothInput),
&allowBluetoothInput
);
NSLog(#"status = %x", stat); // problem if this is not zero
// check the audio route
UInt32 size = sizeof(CFStringRef);
CFStringRef route;
OSStatus result = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
NSLog(#"route = %#", route);
// if bluetooth headset connected, should be "HeadsetBT"
// if not connected, will be "ReceiverAndMicrophone"
// now, play a quick sound we put in the bundle (bomb.wav)
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
soundFileURLRef = CFBundleCopyResourceURL (mainBundle,CFSTR ("bomb"),CFSTR ("wav"),NULL);
AudioServicesCreateSystemSoundID (soundFileURLRef,&soundFileObject);
AudioServicesPlaySystemSound (soundFileObject); // should play into headset
Hope that helps!
I was able to get this working, but it took some doing. I've pieced together the pertinent piece of code here:
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&err];
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty(
kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
sizeof (allowBluetoothInput),
&allowBluetoothInput);
It is also possible to which sources are available and switch between bluetooth, a headset, handset or the speakerphone but things become very involved at that point. The audio source manager I ultimately wrote was over 700 lines.
Here is the code:
-(void)stop
{
NSLog(#"Disposing Sounds");
AudioServicesDisposeSystemSoundID (soundID);
//AudioServicesRemoveSystemSoundCompletion (soundID);
}
static void completionCallback (SystemSoundID mySSID, void* myself) {
NSLog(#"completion Callback");
}
- (void) playall: (id) sender {
[self stop];
AudioServicesAddSystemSoundCompletion (soundID,NULL,NULL,
completionCallback,
(void*) self);
OSStatus err = kAudioServicesNoError;
NSString *aiffPath = [[NSBundle mainBundle] pathForResource:#"slide1" ofType:#"m4a"];
NSURL *aiffURL = [NSURL fileURLWithPath:aiffPath];
err = AudioServicesCreateSystemSoundID((CFURLRef) aiffURL, &soundID);
AudioServicesPlaySystemSound (soundID);
NSLog(#"Done Playing");
}
Output:
Disposing Sounds
Done Playing
In actual no sound gets play at all and completion call back isn't called as well. Any idea what could be wrong here?
I want to stop any previous sound before playing current.
AFAIK, the only supported files are .caf, .aif, or .wav:
To play your own sounds, add the sound
file to your application bundle; the
sound file must adhere to the
following requirements:
Must be .caf, .aif, or .wav files.
The audio data in the file must be in PCM or IMA/ADPCM (IMA4) format.
The file's audio duration must be less than 30 seconds.
Audio & Video Coding How-To's
What does err contain? From that you should be able to infer the problem.
You can use AudioToolBox framework for this:
CFBundleRef mainbundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef = CFBundleCopyResourceURL(mainbundle, CFSTR("tap"), CFSTR("aif"), NULL);
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundFileObject);
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
AudioServicesPlaySystemSound(1100);