主要用到的有:

1.阿里OSS对象存储管理语音文件
2.AVAudioRecorder录音
3.AVAudioPlayer播放

下面按照:录音->上传->下载-播放的顺序来列出:

一:变量,常量声名

//阿里oss相关
NSString * const endPoint = @"你的节点地址";
NSString * const multipartUploadKeyId = @"你的keyId";
//这里我把secret放在本地,因为语音没有保密必要,阿里可以将secret放到服务端,
//通过请求来获得,具体请自行参考阿里开发文档
NSString * const multipartUploadKeySecret = @"你的keySecret";

static AVAudioRecorder *audioRecorder;
static AVAudioPlayer *audioPlayer;
static OSSClient *client;

二:录音


#import 

/**
 @param 阿里oss fileKey
 @return "flag":0->失败,其它->成功
 */
+ (NSString*)startAudioRecordWithFileKey:(NSString*)fileKey{
    NSLog(@"self==>%@", self);
    BOOL flag = [AppController checkMicrophoneAvailability];
    
    if (!flag) {
        DLog(@"麦克风不可用");
        return [NSString stringWithFormat:@"%d", flag];
    }
    
    NSURL *url = [AppController fileUrlWithfileKey:fileKey];
    
    NSMutableDictionary *settings = [NSMutableDictionary dictionary];
    //采样率，8000是电话采样率，对一般的录音已经足够了
    [settings setObject:[NSNumber numberWithFloat:8000] forKey:AVSampleRateKey];        
    //文件格式,aac兼容Android   
    [settings setObject:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];    
    //通道数,有的文章说iPhone只有一个麦克风，一个通道已经足够了,但是我看很多用的都是2,都
    //可以正常录音的,我试过
    [settings setObject:@2 forKey:AVNumberOfChannelsKey];             
    //采样位数                          
    [settings setObject:@16 forKey:AVLinearPCMBitDepthKey];                                    
    
    audioRecorder = [[AVAudioRecorder alloc] initWithURL:url settings:[settings copy] error:nil];
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:nil];
    
    audioRecorder.delegate = APP_DELEGATE;
    audioRecorder.meteringEnabled = YES;
    
    flag = [audioRecorder record];
    return [NSString stringWithFormat:@"%d", flag];
}

//检查麦克风是否可用
+ (BOOL)checkMicrophoneAvailability{
    __block BOOL ret = NO;
    AVAudioSession *session = [AVAudioSession sharedInstance];
    if ([session respondsToSelector:@selector(requestRecordPermission:)]) {
        [session performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
            ret = granted;
        }];
    } else {
        ret = YES;
    }
    
    return ret;
}

//录音文件路径,我这里用的是temp文件夹,因为录音上传完或者播放完后就可以删除了
+ (NSURL*)fileUrlWithfileKey:(NSString*)fileKey{
    return [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:fileKey]];
}

//实现AVAudioRecorderDelegate方法
#pragma mark - AVAudioRecorderDelegate

//播放后将audioRecorder设置为nil,因为每次都需要新建一个来录音,当然ARC下不需要置nil应该也没问题
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{
    NSLog(@"%s", __func__);
    audioRecorder = nil;
}

- (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder error:(NSError *)error{
    NSLog(@"%@", error);
}

三:停止录音:

[audioRecorder stop];

四:初始化OSSClient

//初始化OSSClient,实现阿里OSS的文件,bucket管理
+ (OSSClient*)client{
    if (!client) {
        [AppController initOSSClient];
    }
    
    return client;
}

+ (void)initOSSClient {
    // 明文设置secret的方式建议只在测试时使用，更多鉴权模式参考后面链接给出的官网完整文档的`访问控制`章节
    id credential = [[OSSPlainTextAKSKPairCredentialProvider alloc] initWithPlainTextAccessKey:multipartUploadKeyId
                                                                                                            secretKey:multipartUploadKeySecret];
    client = [[OSSClient alloc] initWithEndpoint:endPoint credentialProvider:credential];
}

五:接下来上传录音文件:

上传文件需要两个参数
一个是bucketName,相当于文件夹名,自行定义,可以用代码管理bucketName,这里就不写了;
一个是fileKey,相当于文件名,我这里的fileKey是外面传入的,用的是"userId_时间戳"这种格式.
开始想的是每天开一个新的bucket来上传,以便管理云上的文件,删除旧的.
但是有个问题就是如果用户刚好在24点时语音,会出现问题,解决方法应该是上传,下载后告知服务器此语音的bucketName加fileKey,由于时间问题,没做

/**
 @return "flag,fileKey"
 flag    1成功,0失败
 fileKey 阿里oss fileKey
 */
+ (void)uploadAudioRecordWithBucketName:(NSString*)bucketName fileKey:(NSString*)fileKey{
    NSURL *fileUrl = [AppController fileUrlWithfileKey:fileKey];
    OSSPutObjectRequest *put = [OSSPutObjectRequest new];
    
    // required fields
    put.bucketName = bucketName;
    put.objectKey = fileKey;
    put.uploadingFileURL = fileUrl;
    
    OSSTask *putTask = [[AppController client] putObject:put];
    
    [putTask continueWithBlock:^id(OSSTask *task) {
        //上传成功后删除录音文件
        [AppController removeAudioFileWithUrl:fileUrl];
        BOOL flag = task.error == nil;

        if (flag) {
            //在这里告知公司服务器用户上传了语音消息
            NSLog(@"upload object success!");
        } else {
            NSLog(@"upload object failed, error: %@" , task.error);
        }
        return nil;
    }];
}

六:告知公司服务器用户上传了语音消息

参数:userId, fileKey,bucketName

七:公司服务器告知消息接收方需要下载消息

参数:bucketName,fileKey

八:下载录音文件

+ (void)downloadAudioRecordWithBucketName:(NSString*)bucketName fileKey:(NSString*)fileKey{
    OSSGetObjectRequest * request = [OSSGetObjectRequest new];
    // required
    request.bucketName = bucketName;
    request.objectKey = fileKey;
    
    NSURL *downloadUrl = [AppController fileUrlWithfileKey:fileKey];
    request.downloadToFileURL = downloadUrl;
    OSSTask * getTask = [[AppController client] getObject:request];
    
    [getTask continueWithBlock:^id(OSSTask *task) {
        if (!task.error) {
            //去播放语音
            [AppController playAudioRecordWithUrl:downloadUrl];
        } else {
            NSLog(@"download object failed, error: %@" ,task.error);
        }
        return nil;
    }];
}

九:播放

+ (void)playAudioRecordWithUrl:(NSURL*)url{
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    NSError *error;
    //注意这里,之前用wav格式,初始化Andoird端发出的语音时,audioPlayer总是返回nil,解决方法见最下方
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    audioPlayer.delegate = APP_DELEGATE;
    
    BOOL success = [audioPlayer play];
    
    if (success) {
        NSLog(@"播放成功");
    }else{
        NSLog(@"播放失败");
    }
}

//实现AVAudioPlayerDelegate
#pragma mark - AVAudioPlayerDelegate

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
    audioPlayer = nil;
    //播放完成后,删除录音文件
    [AppController removeAudioFileWithUrl:player.url];
}

- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error{
    DLog(@"%@", error);
    //播放失败后,也删除录音文件
    [AppController removeAudioFileWithUrl:player.url];
}

十:使用后删除录音文件

+ (void)removeAudioFileWithUrl:(NSURL*)url{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    [fileManager removeItemAtURL:url error:&error];

    if (error) {
        DLog(@"deleteAudioFileWithUrl failed: %@", error);
    }
}

十一:坑

1.iOS这边流程正常,但是出现了iOS上传的录音Android能放,但是Android的录音iOS不能放
将Android的录音下载后,在其它播放器上可以正常播放,开始时候我们统一用的.wav格式,报错是:

OSStatus error 2003334207

关于这个错误,大家可以用mac的计算器看下,打开计算器,在上栏中选择编程型:

image.png

然后,粘贴错误码2003334207