AudioQueue volume too low

Question

I am having a problem when using AudioQueue to play PCM data. The volume is low when using the iPhone's speaker; I have even turned the system volume up to maximum. However, the volume is fine when I am using the earphones.

I inserted the data into the queue like this:

    memcpy(mBuffers[mIndex]->mAudioData, pcmData, mBufferByteSize);
    mBuffers[mIndex]->mAudioDataByteSize = mBufferByteSize;
    mBuffers[mIndex]->mPacketDescriptionCount = mBufferByteSize/2;
    OSStatus status = AudioQueueEnqueueBuffer(mQueue, mBuffers[mIndex], 0, NULL);
    NSLog(@"fill audio queue buffer[%d]",mIndex);
    if(mIndex == kNumberBuffers - 1) {
        isStartPlay = YES;
        mIndex = 0;
        AudioQueueSetParameter(mQueue, kAudioQueueParam_Volume, 1.0);
        status = AudioQueueStart(mQueue, NULL);
    }else {
        mIndex++;
    }

I have set the volume like this:

    AudioQueueSetParameter(mQueue, kAudioQueueParam_Volume, 1.0);

Did you check the result of `AudioQueueSetParameter` ? Make sure it is successful. — KudoCC, Sep 16 '15 at 06:49
I printed `AudioQueueSetParameter(mQueue, kAudioQueueParam_Volume, 1.0)` and its result was 0. Is that means it failed to set parameter? @KudoCC — jojoT, Sep 16 '15 at 07:20

score 1 · Answer 1 · answered Jun 28 '17 at 14:31

For those still having this issue which is even on SpeakHere sample code. This solution worked well for me out of all the other ones :

//ViewController.m

#import "ViewController.h"


@interface ViewController ()
{ AVAudioSession *session; }

- (void)viewDidLoad {
    [super viewDidLoad];

    //This ensures it plays properly on speaker output
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord
                                     withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker
                                           error:nil];

}

AudioQueue volume too low

1 Answers1

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