发送记录音频后

Question

我录制音频与AVAudioRecorder：

audioRecorder = nil; 

//Initialize audio session 
AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
[audioSession setCategory:AVAudioSessionCategoryRecord error:nil]; 

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; 

//Override record to mix with other app audio, background audio not silenced on record 
OSStatus propertySetError = 0; 
UInt32 allowMixing = true; 
propertySetError = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing); 

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

NSLog(@"Mixing: %lx", propertySetError); // This should be 0 or there was an issue somewhere 

[[AVAudioSession sharedInstance] setActive:YES error:nil]; 

NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] initWithCapacity:0]; 

if (recordEncoding == ENC_PCM) { 
    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey]; 
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0]    forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt:2]      forKey:AVNumberOfChannelsKey]; 

    [recordSetting setValue:[NSNumber numberWithInt:16]      forKey:AVLinearPCMBitDepthKey]; 
    [recordSetting setValue:[NSNumber numberWithBool:NO]     forKey:AVLinearPCMIsBigEndianKey]; 
    [recordSetting setValue:[NSNumber numberWithBool:NO]     forKey:AVLinearPCMIsFloatKey]; 
} else { 

    NSNumber *formatObject; 

    switch (recordEncoding) { 
     case ENC_AAC: 
      formatObject = [NSNumber numberWithInt:kAudioFormatMPEG4AAC]; 
      break; 

     case ENC_ALAC: 
      formatObject = [NSNumber numberWithInt:kAudioFormatAppleLossless]; 
      break; 

     case ENC_IMA4: 
      formatObject = [NSNumber numberWithInt:kAudioFormatAppleIMA4]; 
      break; 

     case ENC_ILBC: 
      formatObject = [NSNumber numberWithInt:kAudioFormatiLBC]; 
      break; 

     case ENC_ULAW: 
      formatObject = [NSNumber numberWithInt:kAudioFormatULaw]; 
      break; 

     default: 
      formatObject = [NSNumber numberWithInt:kAudioFormatAppleIMA4]; 
      break; 
    } 

    [recordSetting setValue:formatObject        forKey:AVFormatIDKey]; 
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0]   forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt:2]     forKey:AVNumberOfChannelsKey]; 
    [recordSetting setValue:[NSNumber numberWithInt:12800]    forKey:AVEncoderBitRateKey]; 

    [recordSetting setValue:[NSNumber numberWithInt:16]     forKey:AVLinearPCMBitDepthKey]; 
    [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey]; 

} 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *recDir = [paths objectAtIndex:0]; 
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/recordTest.caf", recDir]]; 

NSError *error = nil; 
audioRecorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&error]; 

if (!audioRecorder) { 
    NSLog(@"audioRecorder: %@ %d %@", [error domain], [error code], [[error userInfo] description]); 
    return; 
} 

// audioRecorder.meteringEnabled = YES; 
// 
BOOL audioHWAvailable = audioSession.inputAvailable; 
if (! audioHWAvailable) { 
    UIAlertView *cantRecordAlert = 
    [[UIAlertView alloc] initWithTitle: @"Warning" 
           message: @"Audio input hardware not available" 
           delegate: nil 
        cancelButtonTitle:@"OK" 
        otherButtonTitles:nil]; 
    [cantRecordAlert show]; 
    return; 
} 

if ([audioRecorder prepareToRecord]) { 
    [audioRecorder record]; 
    NSLog(@"recording"); 
} else { 
    //  int errorCode = CFSwapInt32HostToBig ([error code]); 
    //  NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode); 
    NSLog(@"recorder: %@ %d %@", [error domain], [error code], [[error userInfo] description]); 
} 

而且我想在POST头发送。我如何正确地做到这一点？我猜我应该有NSData，然后将其转换为NSString。我对吗？如果属实，我怎样才能将AVAudioRecorder输出转换为NSData？

Answer 1

这是我为理解音频文件上传所做的示例应用程序。 您可以使用以下方法使用POST发送录制的音频：

- (IBAction) pushLoader 
    { 
    NSURL *pathURL = urlOfAudioFile; //File Url of the recorded audio 
    NSData *voiceData = [[NSData alloc]initWithContentsOfURL:pathURL]; 
    NSString *urlString = @"http://iroboticshowoff.com/img2/upload.php"; // You can give your url here for uploading 
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc]init]autorelease]; 

    @try 
    { 
     [request setURL:[NSURL URLWithString:urlString]]; 
     [request setHTTPMethod:@"POST"]; 
     NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"]; 
     NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary]; 
     [request addValue:contentType forHTTPHeaderField:@"Content-Type"]; 

     NSMutableData *body = [NSMutableData data]; 
     [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
     [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\".caf\"\r\n"]dataUsingEncoding:NSUTF8StringEncoding]]; 
     [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"]dataUsingEncoding:NSUTF8StringEncoding]]; 
     [body appendData:[NSData dataWithData:voiceData]]; 
     [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary]dataUsingEncoding:NSUTF8StringEncoding]]; 

     [request setHTTPBody:body]; 

     NSError *error = nil; 
     NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error]; 
     NSString *returnString = [[NSString alloc]initWithData:returnData encoding:NSUTF8StringEncoding]; 
     UIAlertView *alert = nil; 
     if(error) 
      { 
      alert = [[UIAlertView alloc]initWithTitle:@"Message" message:@"Error in Uploading the File" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     } 
     else 
      { 
      NSLog(@"Success %@",returnString); 
      alert = [[UIAlertView alloc]initWithTitle:@"Message" message:@"File get uploaded" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     } 
     [alert show]; 
     [alert release]; 
     alert = nil; 
     [returnString release]; 
     returnString = nil; 
     boundary = nil; 
     contentType = nil; 
     body = nil;  
    } 
    @catch (NSException * exception) 
    { 
     NSLog(@"pushLoader in ViewController :Caught %@ : %@",[exception name],[exception reason]); 
    } 
    @finally 
    { 
     [voiceData release]; 
     voiceData = nil; 
     pathURL = nil; 
     urlString = nil; 
    } 
}