How to record and play sound in iPhone app?

问题:

I tried using AVAudioSession and AVAudioPlayer to record and play sounds respectively but the sound volume is very low.

I tried putting volume value of AVAudioPlayer to 1.0 and more but didnt help much.

What could be my other options to record sound which can be loud enough to play back?

回答1:

This code should be useful for you:

#import <AudioToolbox/AudioServices.h>

    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;                
    AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,          
                                 sizeof (audioRouteOverride),&audioRouteOverride);  

It will increase volume. The functionality of the code is to convert the ordinary sound to speaker sound on ur iPhone. That's why kAudioSessionOverrideAudioRoute_Speaker is used.

回答2:

Since iOS7 you can fix this issue directly with AVAudioSession

The overrideOutputAudioPort method does the same than AudioSessionSetProperty

NSError *setOverrideError;
NSError *setCategoryError;

AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&setCategoryError];

if(setCategoryError){
    NSLog(@"%@", [setCategoryError description]);
}

[session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&setOverrideError];


if(setOverrideError){
    NSLog(@"%@", [setOverrideError description]);
}

回答3:

Swift version :

 import AVFoundation
 var overrideError : NSError?
    if AVAudioSession.sharedInstance().overrideOutputAudioPort(.Speaker, error: &error){

    }else{
        print("error in overrideOutputAudioPort " + overrideError!.localizedDescription)
    }

Swift 2:

        do {
        try AVAudioSession.sharedInstance().overrideOutputAudioPort(AVAudioSessionPortOverride.Speaker)
        } catch {
        }

回答4:

The following code fixed this issue for me:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
UInt32 doChangeDefault = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefault), &doChangeDefault);

回答5:

MAN, try this.

AVAudioSession *session = [AVAudioSession sharedInstance];

NSError *setCategoryError = nil;
if (![session setCategory:AVAudioSessionCategoryPlayback
              withOptions:kAudioSessionOverrideAudioRoute_Speaker
                    error:&setCategoryError]) {
        // handle error
}

NSError *error;
NSData * data = [NSData dataWithContentsOfURL:self.playlet.urlSound];

self.audioPlayer = [[AVAudioPlayer alloc] initWithData:data fileTypeHint:@"aac" error:&error];

self.audioPlayer.delegate = self;

if (error)
    NSLog(@"Error: %@",
          [error localizedDescription]);
else
    [_audioPlayer play];

回答6:

just set this [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&setOverrideError]; It works for me.