解决了语音上传到问题，接下来要解决下载播放问题

Pods/Qiniu/QiniuSDK/Utils/NSData+QNMD5.m

@@ -0,0 +1,28 @@
+//
+//  NSData+MD5.m
+//  QiniuSDK
+//
+//  Created by 杨森 on 2020/7/28.
+//  Copyright © 2020 Qiniu. All rights reserved.
+//
+
+#import "NSData+QNMD5.h"
+#import <CommonCrypto/CommonDigest.h>
+
+@implementation NSData(QNMD5)
+
+- (NSString *)qn_md5{
+    
+    CC_MD5_CTX md5;
+    CC_MD5_Init(&md5);
+    CC_MD5_Update(&md5, self.bytes, (CC_LONG)self.length);
+    unsigned char digest[CC_MD5_DIGEST_LENGTH];
+    CC_MD5_Final(digest, &md5);
+    NSMutableString *result = [NSMutableString string];
+    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
+        [result appendFormat:@"%02X", digest[i]];
+    }
+    return result;
+}
+
+@end