A library that convert audio file format from amr to wav .
Modify from https://github.com/jxd001/amr-to-wav
pod 'Amr2Wav', :git => 'https://github.com/summerblue/Amr2Wav.git'
#import "amrFileCodec.h"
NSString *mediaPath = @"http://oralmaster-ugc.qiniudn.com/user_1_2014-12-23_10:13:39-SmKxmA.amr";
NSURL *url = [[NSURL alloc] initWithString:mediaPath];
NSData * audioData = [NSData dataWithContentsOfURL:url];
// Conversion
NSData *data = DecodeAMRToWAVE(audioData);