最近在总结项目里用到的技术,包括很早之前用的一些东西!有时间就总结总结在总结
下面通过网址下载音频缓存到本地
主要的思路就是从服务器上下载音频缓存本地,然后同一个视频再次下载是先判断本地,如果有取出来,如果没有在下载,当然我们是下载一个 amr 的转成 war 的病缓存到本地
二话不说上代码
DownloadAudioService.h

typedef void(^FinishBlock)(NSString *filePath);
typedef void(^Failed)();

@interface DownloadAudioService : NSObject
/*
 * url                  音频网址
 * directoryPath  存放的地址
 * fileName         要存的名字
 */
+ (void)downloadAudioWithUrl:(NSString *)url
           saveDirectoryPath:(NSString *)directoryPath
                    fileName:(NSString *)fileName
                      finish:(FinishBlock )finishBlock
                      failed:(Failed)failed;

DownloadAudioService.m
//这个就不用接介绍了大家都熟悉
AFNetworking.h
//这个是转换音频格式的
VoiceConverter.h
amrFileCodec.h

+ (void)downloadAudioWithUrl:(NSString *)url
           saveDirectoryPath:(NSString *)directoryPath
                    fileName:(NSString *)fileName
                      finish:(FinishBlock )finishBlock
                      failed:(Failed)failed
{
    NSString *file_path = [directoryPath stringByAppendingPathComponent:fileName];
    NSFileManager *fm = [NSFileManager defaultManager];
    
    /// 判断文件是否已经存在
    if ([fm fileExistsAtPath:file_path])
    {
        finishBlock(file_path);
    }
    /// 不存在时
    else
    {
        NSURL *URL = [NSURL URLWithString:url];
        NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
        //AFN3.0+基于封住URLSession的句柄
        AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
        //请求
        NSURLRequest *request = [NSURLRequest requestWithURL:URL];
        //下载Task操作
        NSURLSessionDownloadTask *_downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
            //进度
            
        } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
            
            NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
            NSString *path = [cachesPath stringByAppendingPathComponent:response.suggestedFilename];
            return [NSURL fileURLWithPath:path];
            
        } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
            // filePath就是你下载文件的位置，你可以解压，也可以直接拿来使用
            NSString *armFilePath = [filePath path];// 将NSURL转成NSString
            if ([DownloadAudioService amrToWavFrom:armFilePath to:file_path]) {
                finishBlock(file_path);
            }
            else {
                failed();
            }
        }];
        [_downloadTask resume];
    }
}
#pragma mark - amr格式转换wav格式
+(BOOL)amrToWavFrom:(NSString *)amrPath to:(NSString *)wavPath {
    //转格式
    return [VoiceConverter ConvertAmrToWav:amrPath wavSavePath:wavPath];
}