关于iOS 录音并且转码上传的相关问题

第一步: 录音

录音这个很简单,给大家分享一个比较全面的demo,

https://github.com/liuchunlao/RecordAndPlayVoice;

录音和播放的功能基本够用了,

/** 录音工具的单例 */
+ (instancetype)sharedRecordTool;

/** 开始录音 */
- (void)startRecording;

/** 停止录音 */
- (void)stopRecording;

/** 播放录音文件 */
- (void)playRecordingFile;

/** 停止播放录音文件 */
- (void)stopPlaying;

/** 销毁录音文件 */
- (void)destructionRecordingFile;

/** 录音对象 */
@property (nonatomic, strong) AVAudioRecorder *recorder;
/** 播放器对象 */
@property (nonatomic, strong) AVAudioPlayer *player;

/** 更新图片的代理 */
@property (nonatomic, assign) id<LVRecordToolDelegate> delegate;

详细的实现代码大家可以看下载的demo.

需要提醒大家注意一点:

如果你要转码成MP3,这部分的设置不能随便写<代码一>

- (AVAudioRecorder *)recorder {
    if (!_recorder) {

        // 1.获取沙盒地址
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
        // 2.录音文件的路径 @"lvRecord.caf"
        NSString *filePath = [path stringByAppendingPathComponent:LVRecordFielName];
        self.recordFileUrl = [NSURL fileURLWithPath:filePath];
        NSLog(@"%@", filePath);


         NSDictionary *setting = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithInt:AVAudioQualityMin],
                             AVEncoderAudioQualityKey,
                             [NSNumber numberWithInt:16],
                             AVEncoderBitRateKey,
                             [NSNumber numberWithInt:2],
                             AVNumberOfChannelsKey,
                             [NSNumber numberWithFloat:44100.0],
                             AVSampleRateKey,
                               nil];

        _recorder = [[AVAudioRecorder alloc] initWithURL:self.recordFileUrl settings:setting error:NULL];
        _recorder.delegate = self;
        _recorder.meteringEnabled = YES;
//崩溃的地方
        [_recorder prepareToRecord];
    }
    return _recorder;
}

setting里的参数设置,这些值是我尝试出来的转码成MP3后还可以正常播放的值,如果有某一个值不合适,你就听不到自己录的音了哦;至于为什么要设置成这些参数,本人目前还未深究,如果有这方面的大牛,可以分享下;还有一点,大家注意看,我注释的那行

//崩溃的地方
[_recorder prepareToRecord];

如果你用了这个demo,可能会发现,模拟器上跑会崩在这一行,但是跑真机上可以正常录音和播放,我当时被这个bug卡了很久,一度都想要放弃了,后来同事帮忙查到,这是xcode的bug,真心有点想吐血的感觉!!!

解决办法很简单,如图,打个全局断点,右击,第一个选项Exception 选择All,就OK了

这个问题可以就这样圆满解决了!!

第二步:转MP3

首先,你需要去网上下载一个lame的第三方库,网上很多的但要提醒大家,你下载的lame.a必须是支持 64 位编译器的,否则导入会报错.下载完后,只需要把这两个东西添加到你的项目中就可以啦

如图

然后还需要一段代码<代码2为借鉴结果>

- (void)audio_CAFtoMP3
{
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
     NSString *filePath = [path stringByAppendingPathComponent:@"lvRecord.caf"];
    NSString *mp3FilePath = [path stringByAppendingPathComponent:@"temp.mp3"];

    @try {
        int read, write;

        FILE *pcm = fopen([filePath cStringUsingEncoding:1], "rb"); //source 被转换的音频文件位置
        fseek(pcm, 4*1024, SEEK_CUR);                                   //skip file header
        FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb"); //output 输出生成的Mp3文件位置

        const int PCM_SIZE = 8192;
        const int MP3_SIZE = 8192;
        short int pcm_buffer[PCM_SIZE*2];
        unsigned char mp3_buffer[MP3_SIZE];

        lame_t lame = lame_init();
        lame_set_num_channels(lame,1);//设置1为单通道，默认为2双通道
        lame_set_in_samplerate(lame, 44100.0);
        lame_set_VBR(lame, vbr_default);

        lame_set_brate(lame,8);

        lame_set_mode(lame,3);

        lame_set_quality(lame,2);

        lame_init_params(lame);

        do {
            read = fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);
            if (read == 0)
                write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
            else
                write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);

            fwrite(mp3_buffer, write, 1, mp3);

        } while (read != 0);

        lame_close(lame);
        fclose(mp3);
        fclose(pcm);
    }
    @catch (NSException *exception) {
        NSLog(@"%@",[exception description]);
    }
    @finally {
//        self.audioFileSavePath = mp3FilePath;
//        NSLog(@"MP3生成成功: %@",self.audioFileSavePath);
    }

}

这样就成功的把.caf 或者 .wav转换成了mp3格式.如果你想问为什么要转MP3或者不转MP3能不能上传,不好意思,我只能告诉你,苹果的录音格式安卓获取到了无法播放,不转能不能上传这个需要你自己去尝试一下.

第三步:上传

我们首先要拿到录音文件的路径,然后用NSFileManager以二进制的格式读取出来,再用自己封装的AFN上传就可以啦.我们项目里是有图片和音频一起上传的,在这里把代码拿出来和大家分享下

+(void)photoImagePost:(NSDictionary *)paramDict andImageDatas:(NSMutableArray*)imageArray andVoiceData:(NSString *)filePath success:(mSuccessBlock)successBlock errorBlock:(mErrorBlock)errorBlock
{
    [AppSettings httpSetCookies];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer =[AFHTTPRequestSerializer serializer];
    manager.responseSerializer =[AFJSONResponseSerializer serializer];

    //[manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    manager.responseSerializer.acceptableContentTypes=[manager.responseSerializer.acceptableContentTypes setByAddingObject: @"text/html"];

    //设置多个文件的分隔符
    unsigned int random = arc4random();
    NSString * boundary = [NSString stringWithFormat:@"%d",random];

    NSString *contentType = [NSString stringWithFormat:@"boundary=%@",boundary];
    [manager.requestSerializer setValue:contentType forHTTPHeaderField:@"Content-Type"];

    [manager.requestSerializer willChangeValueForKey:@"timeoutInterval"];
    manager.requestSerializer.timeoutInterval = 30.f;
    [manager.requestSerializer didChangeValueForKey:@"timeoutInterval"];


    NSString *uslStr =[postURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    //    NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithCapacity:0];
    //    [dict setValue:serviceCode forKey:@"A"];
    //    [dict setValue:[paramDict JSONString] forKey:@"P"];

    [manager POST:uslStr parameters:paramDict constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
     {
         // 图片处理
         for(int i=0;i<imageArray.count;i++)
         {
             NSData *data=UIImageJPEGRepresentation(imageArray[i], 0.2);
             [formData appendPartWithFileData:data name:[NSString stringWithFormat:@"Pictures[]"] fileName:[NSString stringWithFormat:@"pic%d.jpg",i+1] mimeType:@"image/*"];
         }
         // 语音处理
         //方法1
         NSFileManager* fm=[NSFileManager defaultManager];

         NSData *data = nil;

         //路径是传进来的
         if([fm fileExistsAtPath:filePath]){

             //读取某个文件

              data = [NSData dataWithContentsOfFile:filePath];
             //    NSLog(@"%@",data);
         }

         [formData appendPartWithFileData:data name:@"voice[]" fileName:@"temp.mp3" mimeType:@"amr/mp3/wmr"];
         //

     } success:^(AFHTTPRequestOperation *operation,id responseObject) {

         successBlock(operation,responseObject);

     } failure:^(AFHTTPRequestOperation *operation,NSError *error) {
         errorBlock(operation, error);
         NSLog(@"%@",error);
     }];

}

这样,就可以上传成功啦!

第四步: 从服务器获取录音文件并播放

其实,录音成功了,播放很简单,导入头文件:

#import <AVFoundation/AVFoundation.h>

//播放
            NSString * urlStr = [NSString stringWithFormat:@"http://120.25.221.42:8010%@",model.Voice.lastObject];
            NSURL *url = [NSURL URLWithString:urlStr];

            //把音频文件保存到本地
            NSData *audioData = [NSData dataWithContentsOfURL:url];
            NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            NSString *filePath = [NSString stringWithFormat:@"%@/%@.mp3", docDirPath ,
                                  @"temp2"];
          // DDLogWarn(@" 从网络拿到的音频数据写入的本地路径 %@",filePath);
            [audioData writeToFile:filePath atomically:YES];

            NSURL *fileURL = [NSURL fileURLWithPath:filePath];
            self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error: &error];


            self.player.volume=1;

            if (error) {

                NSLog(@"error:%@",[error description]);

                return;

            }

            //准备播放

            [self.player prepareToPlay];
            [self.player play];

           //显示时长 (暂时是点击了播放之后才知道时长)
            float duration = (float)self.player.duration;

            NSString *format = [self decimalwithFormat:@"0" floatV:duration ];


            self.voice.timeLable.text = [NSString stringWithFormat:@"%@S",format];