CODEWITHSUNDEEP
core-audioaudioqueueaudioqueueservices
whitebear
whitebear

Reputation: 12433

Audio Queue doesnt play sound

I am making application which uses Audio Queue. I made these code by reading and studying from books.

I just want to play the audio file simply. it doesnt show any compile errors,but it doesn't soound.

please help me.

AudioQueuePayer.h

@interface AudioQueuePlayer : NSObject{
    AudioQueueRef audioQueueObject;
    AudioFileID audioFileID;
    UInt32 numPacketsToRead;
    SInt64 startingPacketCount;
    BOOL donePlayingFile;
}

@property UInt32 numPacketsToRead;
@property AudioFileID audioFileID;
@property SInt64 startingPacketCount;
@property BOOL donePlayingFile;

-(void) prepareAudioQueue;
-(void)play;

AUdioQueuePlayer.m

-(void)prepareAudioQueue{
    //open Audio File
    NSString *path = [[NSBundle mainBundle] pathForResource: @"Arles_001_44"
                                                 ofType: @"wav"];
    NSURL *fileURL = [NSURL fileURLWithPath:path];

    AudioFileOpenURL((__bridge CFURLRef)fileURL,kAudioFileReadPermission,kAudioFileWAVEType,&audioFileID);

    //get audiostreamBasicDescription
    AudioStreamBasicDescription audioFormat;
    UInt32 size = sizeof(AudioStreamBasicDescription);
    AudioFileGetProperty(audioFileID,kAudioFilePropertyDataFormat,&size,&audioFormat);

    //making audioQueue Object
    AudioQueueNewOutput(&audioFormat,outputCallback,(__bridge void *)(self),NULL,NULL,0,&audioQueueObject);

    UInt32 maxPacketSize;
    UInt32 propertySize = sizeof(maxPacketSize);
    AudioFileGetProperty(audioFileID,kAudioFilePropertyPacketSizeUpperBound,
                     &propertySize,
                     &maxPacketSize);
    printf("maxPacketSize = %d\n",maxPacketSize);
    startingPacketCount = 0;
    AudioQueueBufferRef buffers[3];
    numPacketsToRead = 1024;
    UInt32 bufferByteSize = numPacketsToRead * maxPacketSize;
    NSLog(@"bufferByteSize = %d",bufferByteSize);
    int bufferIndex;
    for (bufferIndex = 0;bufferIndex < 3 ;bufferIndex++){

    //make buffers
        AudioQueueAllocateBuffer(audioQueueObject,bufferByteSize,&buffers[bufferIndex] );
        outputCallback((__bridge void *)(self),audioQueueObject,buffers[bufferIndex]);
        if (donePlayingFile)break;
    }

}

- (id)init{
    self = [super init];
    if (self != nil){
        [self prepareAudioQueue];
    }
    return self;
}

- (void)play{
    AudioQueueStart(audioQueueObject,NULL);
    NSLog(@"play Audio Queue");
}

void outputCallback(void *inUserData,
                AudioQueueRef inAQ,
                AudioQueueBufferRef inBuffer){
    //write herelater.
}

in other class

AudioQueuePlayer *AQP = [AudioQueuePlayer alloc];
[AQP play];

Upvotes: 0

Views: 1032

Answers (2)

IPv6
IPv6

Reputation: 435

May be you should init shared audio session first, like described here - https://stackoverflow.com/a/44805489/57449

Yes, in order to get sound from AudioQueue you should initialize AudioSession too. Stucked with the similar problem, in my case AudioSession produced sound only after AVCaptureSession succesfull use (which initializes session internally).

Upvotes: 0

audionuma
audionuma

Reputation: 343

what happens if you init your AudioQueuePlayer instead of just alloc ?

AudioQueuePlayer *AQP [[AudioQueuePlayer alloc] init];

Besides, most of CoreAudio functions return an OSStatus error code that you might check, like :

OSStatus err;
err = AudioFileOpenURL((__bridge CFURLRef)fileURL,kAudioFileReadPermission,kAudioFileWAVEType,&audioFileID);
if (err != noErr) {
    //do something
}

Errors checking might help in finding what goes wrong.

Upvotes: 0

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