首页 \ 问答 \ 目标c中的音频文件格式问题(Audio file format issue in objective c)

目标c中的音频文件格式问题(Audio file format issue in objective c)

 我用AVAudioRecorder写了一个音频WAV（录制了我的声音）文件。 最终的文件格式是WAV文件。 文件已成功保存，我可以听到我的声音。 我想将此文件发送到后端服务器（Web服务）。 但我的服务器只接受WAV中的数据和FMT信息。 它不接受我的wav文件，因为我使用FLLR，数据，FMT进行了wav文件信息。 我在Riffpad工具中检查了我的WAV文件信息。 它显示FLLR，数据，FMT。 但我只想要数据和fmt。 因为我的服务器端只接受数据和FMT。 所以请建议如何以编程方式删除我的wav文件中的FLLR？ 
 

 在这里输入图像描述 
 

 我的记录源代码： 
 

  NSError *error;

    // Recording settings
    NSMutableDictionary *settings = [NSMutableDictionary dictionary];
    [settings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [settings setValue: [NSNumber numberWithFloat:22050] forKey:AVSampleRateKey];
    [settings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey]; // mono
    [settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    //[settings setValue: [NSNumber numberWithInt:16] forKey:AudioSampleType];




    // File URL
    NSURL *url = [NSURL fileURLWithPath:FILEPATH];

    //NSLog(@"Url file path ::: %@",url);

    // Create recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];
    if (!recorder)
    {
//        NSLog(@"Error establishing recorder: %@", error.localizedFailureReason);
        return;
    }


I have written an audio WAV (have recorded my voice) file using AVAudioRecorder. The final file format is a WAV file. File was successfully saved and I can hear my voice. I want to send this file to a back End server (web-service). But my server accepting only data and FMT information in WAV . It is not accepting my wav file because of my wav file infromation with FLLR, data, FMT. I have checked my WAV file information in Riffpad tool. It's showing FLLR, data, FMT. But I want only data and fmt. Because my server side accepts only data and FMT. So please advice how to remove FLLR in my wav file in programmatically?
 

enter image description here
 

My source code for the record:
 

  NSError *error;

    // Recording settings
    NSMutableDictionary *settings = [NSMutableDictionary dictionary];
    [settings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [settings setValue: [NSNumber numberWithFloat:22050] forKey:AVSampleRateKey];
    [settings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey]; // mono
    [settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    //[settings setValue: [NSNumber numberWithInt:16] forKey:AudioSampleType];




    // File URL
    NSURL *url = [NSURL fileURLWithPath:FILEPATH];

    //NSLog(@"Url file path ::: %@",url);

    // Create recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];
    if (!recorder)
    {
//        NSLog(@"Error establishing recorder: %@", error.localizedFailureReason);
        return;
    }


原文：https://stackoverflow.com/questions/32312508
更新时间：2022-10-30 10:10

最满意答案

 感谢上帝和你的支持朋友。 是的，我终于解决了我的问题。 我不知道方式是正确的。 但我的问题解决了。 我使用上面的代码录制了声音并保存了我的音频。然后再次使用以下代码导出音频。 我从https://developer.ibm.com/answers/questions/180732/seems-watson-text-to-speech-service-returns-a-wav.html获取了此代码 
 

-(NSData*) stripAndAddWavHeader:(NSData*) wav {
    unsigned long wavDataSize = [wav length] - 44;

    NSData *WaveFile= [NSMutableData dataWithData:[wav subdataWithRange:NSMakeRange(44, wavDataSize)]];

    NSMutableData *newWavData;
    newWavData = [self addWavHeader:WaveFile];

    return newWavData;
   }


 - (NSMutableData *)addWavHeader:(NSData *)wavNoheader {

       int headerSize = 44;
       long totalAudioLen = [wavNoheader length];
       long totalDataLen = [wavNoheader length] + headerSize-8;
       long longSampleRate = 22050.0;
       int channels = 1;
       long byteRate = 8 * 44100.0 * channels/8;



     Byte *header = (Byte*)malloc(44);
     header[0] = 'R';  // RIFF/WAVE header
     header[1] = 'I';
     header[2] = 'F';
     header[3] = 'F';
     header[4] = (Byte) (totalDataLen & 0xff);
     header[5] = (Byte) ((totalDataLen >> 8) & 0xff);
     header[6] = (Byte) ((totalDataLen >> 16) & 0xff);
     header[7] = (Byte) ((totalDataLen >> 24) & 0xff);
     header[8] = 'W';
     header[9] = 'A';
     header[10] = 'V';
     header[11] = 'E';
     header[12] = 'f';  // 'fmt ' chunk
     header[13] = 'm';
     header[14] = 't';
     header[15] = ' ';
     header[16] = 16;  // 4 bytes: size of 'fmt ' chunk
     header[17] = 0;
     header[18] = 0;
     header[19] = 0;
     header[20] = 1;  // format = 1
     header[21] = 0;
     header[22] = (Byte) channels;
     header[23] = 0;
     header[24] = (Byte) (longSampleRate & 0xff);
     header[25] = (Byte) ((longSampleRate >> 8) & 0xff);
     header[26] = (Byte) ((longSampleRate >> 16) & 0xff);
     header[27] = (Byte) ((longSampleRate >> 24) & 0xff);
     header[28] = (Byte) (byteRate & 0xff);
     header[29] = (Byte) ((byteRate >> 8) & 0xff);
     header[30] = (Byte) ((byteRate >> 16) & 0xff);
     header[31] = (Byte) ((byteRate >> 24) & 0xff);
     header[32] = (Byte) (2 * 8 / 8);  // block align
     header[33] = 0;
     header[34] = 16;  // bits per sample
     header[35] = 0;
     header[36] = 'd';
     header[37] = 'a';
     header[38] = 't';
     header[39] = 'a';
     header[40] = (Byte) (totalAudioLen & 0xff);
     header[41] = (Byte) ((totalAudioLen >> 8) & 0xff);
     header[42] = (Byte) ((totalAudioLen >> 16) & 0xff);
     header[43] = (Byte) ((totalAudioLen >> 24) & 0xff);

     NSMutableData *newWavData = [NSMutableData dataWithBytes:header length:44];
     [newWavData appendBytes:[wavNoheader bytes] length:[wavNoheader length]];
     return newWavData;
 }


Thank God and your support friends. Yes finally i solved my issues. I don't know the way is correct. But my issues is solved. I recorded voice using above code and save my audio .Then again i will export the audio using the following code. I got this code from https://developer.ibm.com/answers/questions/180732/seems-watson-text-to-speech-service-returns-a-wav.html
 

-(NSData*) stripAndAddWavHeader:(NSData*) wav {
    unsigned long wavDataSize = [wav length] - 44;

    NSData *WaveFile= [NSMutableData dataWithData:[wav subdataWithRange:NSMakeRange(44, wavDataSize)]];

    NSMutableData *newWavData;
    newWavData = [self addWavHeader:WaveFile];

    return newWavData;
   }


 - (NSMutableData *)addWavHeader:(NSData *)wavNoheader {

       int headerSize = 44;
       long totalAudioLen = [wavNoheader length];
       long totalDataLen = [wavNoheader length] + headerSize-8;
       long longSampleRate = 22050.0;
       int channels = 1;
       long byteRate = 8 * 44100.0 * channels/8;



     Byte *header = (Byte*)malloc(44);
     header[0] = 'R';  // RIFF/WAVE header
     header[1] = 'I';
     header[2] = 'F';
     header[3] = 'F';
     header[4] = (Byte) (totalDataLen & 0xff);
     header[5] = (Byte) ((totalDataLen >> 8) & 0xff);
     header[6] = (Byte) ((totalDataLen >> 16) & 0xff);
     header[7] = (Byte) ((totalDataLen >> 24) & 0xff);
     header[8] = 'W';
     header[9] = 'A';
     header[10] = 'V';
     header[11] = 'E';
     header[12] = 'f';  // 'fmt ' chunk
     header[13] = 'm';
     header[14] = 't';
     header[15] = ' ';
     header[16] = 16;  // 4 bytes: size of 'fmt ' chunk
     header[17] = 0;
     header[18] = 0;
     header[19] = 0;
     header[20] = 1;  // format = 1
     header[21] = 0;
     header[22] = (Byte) channels;
     header[23] = 0;
     header[24] = (Byte) (longSampleRate & 0xff);
     header[25] = (Byte) ((longSampleRate >> 8) & 0xff);
     header[26] = (Byte) ((longSampleRate >> 16) & 0xff);
     header[27] = (Byte) ((longSampleRate >> 24) & 0xff);
     header[28] = (Byte) (byteRate & 0xff);
     header[29] = (Byte) ((byteRate >> 8) & 0xff);
     header[30] = (Byte) ((byteRate >> 16) & 0xff);
     header[31] = (Byte) ((byteRate >> 24) & 0xff);
     header[32] = (Byte) (2 * 8 / 8);  // block align
     header[33] = 0;
     header[34] = 16;  // bits per sample
     header[35] = 0;
     header[36] = 'd';
     header[37] = 'a';
     header[38] = 't';
     header[39] = 'a';
     header[40] = (Byte) (totalAudioLen & 0xff);
     header[41] = (Byte) ((totalAudioLen >> 8) & 0xff);
     header[42] = (Byte) ((totalAudioLen >> 16) & 0xff);
     header[43] = (Byte) ((totalAudioLen >> 24) & 0xff);

     NSMutableData *newWavData = [NSMutableData dataWithBytes:header length:44];
     [newWavData appendBytes:[wavNoheader bytes] length:[wavNoheader length]];
     return newWavData;
 }

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