文件下載整個功能完成了，那么對應(yīng)的文件上傳也跑不了。So~ Look here~

業(yè)務(wù)需求是錄制音頻然后上傳到七牛并且Android可以讀。

與安卓溝通了一下統(tǒng)一了mp3格式，大小質(zhì)量都不錯。由于AVAudioRecorder錄音的格式為.caf或者.wav而且很大需要進行轉(zhuǎn)換壓縮為MP3格式。這里需要用到三方庫 lame。

使用lame轉(zhuǎn)換后音頻的質(zhì)量和

 _recorder = [[AVAudioRecorder alloc] initWithURL:_recordFilePath settings:setting error:NULL];

里的 setting 息息相關(guān)。 所以整理了兩個配置。

我把這兩種的配置寫在了工具類所以直接貼代碼了~要用的話直接CV大法就可以。

lame三方庫的資源

• 獲取轉(zhuǎn)換文件所在文件夾

+ (NSString *)getRecPathUrl{
    NSString *str = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    
    NSString *recordDir = [str stringByAppendingPathComponent:@"RecordCourse"];
    
    return recordDir;
}

• 獲取時間戳用于文件的命名

+ (NSString *)getTimestamp{
    NSDate *nowDate = [NSDate date];
    double timestamp = (double)[nowDate timeIntervalSince1970]*1000;
    long nowTimestamp = [[NSNumber numberWithDouble:timestamp] longValue];
    NSString *timestampStr = [NSString stringWithFormat:@"%ld",nowTimestamp];
    return timestampStr;
}

• PCM轉(zhuǎn)換MP3配置

+ (NSDictionary *)getAudioSettingWithPCM {
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    //設(shè)置錄音格式
    [dic setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];
    //設(shè)置錄音采樣率，8000是電話采樣率，對于一般錄音已經(jīng)夠了
    [dic setObject:@(44100.0) forKey:AVSampleRateKey];
    //設(shè)置通道,這里采用雙聲道
    [dic setObject:@(1) forKey:AVNumberOfChannelsKey];
    //每個采樣點位數(shù),分為8、16、24、32
    [dic setObject:@(16) forKey:AVLinearPCMBitDepthKey];
    //是否使用浮點數(shù)采樣
    [dic setObject:@(YES) forKey:AVLinearPCMIsFloatKey];
    //....其他設(shè)置等
    return dic;
}

• CAF轉(zhuǎn)換MP3配置

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

    return setting;
}

• PCM轉(zhuǎn)換MP3的lame方法

+ (NSString *)audioPCMtoMP3:(NSString *)wavPath {
    NSString *cafFilePath = wavPath;
    
    NSString *mp3FilePath = [NSString stringWithFormat:@"%@.mp3",[NSString stringWithFormat:@"%@%@",[cafFilePath substringToIndex:cafFilePath.length - 4],[self getTimestamp]]];
    
    NSFileManager* fileManager = [NSFileManager defaultManager];
    if([fileManager removeItemAtPath:mp3FilePath error:nil]){
        NSLog(@"刪除原MP3文件");
    }
    @try {
        int read, write;
        FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1], "rb");  //source 被轉(zhuǎn)換的音頻文件位置
        fseek(pcm, 4*1024, SEEK_CUR);                                   //skip file header
        FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb");  //output 輸出生成的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_in_samplerate(lame, 22050.0);
        lame_set_VBR(lame, vbr_default);
        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 {
        return mp3FilePath;
    }
}

• CAF轉(zhuǎn)換MP3的lame方法

+ (NSString *)audioCAFtoMP3:(NSString *)wavPath {
    
    NSString *cafFilePath = wavPath;
    
    NSString *mp3FilePath = [NSString stringWithFormat:@"%@.mp3",[NSString stringWithFormat:@"%@%@",[cafFilePath substringToIndex:cafFilePath.length - 4],[self getTimestamp]]];
    
    @try {
        int read, write;
        
        FILE *pcm = fopen([cafFilePath cStringUsingEncoding:1], "rb");  //source 被轉(zhuǎn)換的音頻文件位置
        fseek(pcm, 4*1024, SEEK_CUR);                                   //skip file header
        FILE *mp3 = fopen([mp3FilePath cStringUsingEncoding:1], "wb");  //output 輸出生成的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);//設(shè)置1為單通道，默認為2雙通道
        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 {
        return mp3FilePath;
    }
}

兩種質(zhì)量大小不錯都可以使用????

歡迎光臨我的個人博客