Coding-iOS/Coding_iOS/Util/Audio/amrFileCodec.h at master · OKit-iOS-Projects/Coding-iOS

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//  amrFileCodec.h
//  amrDemoForiOS
//  Created by Tang Xiaoping on 9/27/11.
//  Copyright 2011 test. All rights reserved.
#ifndef amrFileCodec_h
#define amrFileCodec_h
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "interf_dec.h"
#include "interf_enc.h"
#import <Foundation/Foundation.h>
#define AMR_MAGIC_NUMBER "#!AMR\n"
#define PCM_FRAME_SIZE 160 // 8khz 8000*0.02=160
#define MAX_AMR_FRAME_SIZE 32
#define AMR_FRAME_COUNT_PER_SECOND 50
typedef struct
	char chChunkID[4];
	int nChunkSize;
}XCHUNKHEADER;
typedef struct
	short nFormatTag;
	short nChannels;
	int nSamplesPerSec;
	int nAvgBytesPerSec;
	short nBlockAlign;
	short nBitsPerSample;
}WAVEFORMAT;
typedef struct
	short nFormatTag;
	short nChannels;
	int nSamplesPerSec;
	int nAvgBytesPerSec;
	short nBlockAlign;
	short nBitsPerSample;
	short nExSize;
}WAVEFORMATX;
typedef struct
	char chRiffID[4];
	int nRiffSize;
	char chRiffFormat[4];
}RIFFHEADER;
typedef struct
	char chFmtID[4];
	int nFmtSize;
	WAVEFORMAT wf;
// WAVE音频采样频率是8khz 
// 音频样本单元数 = 8000*0.02 = 160 (由采样频率决定)
// 声道数 1 : 160
// bps决定样本(sample)大小
// bps = 8 --> 8位 unsigned char
//       16 --> 16位 unsigned short
//int EncodeWAVEFileToAMRFile(const char* pchWAVEFilename, const char* pchAMRFileName, int nChannels, int nBitsPerSample);
// 将AMR文件解码成WAVE文件
//int DecodeAMRFileToWAVEFile(const char* pchAMRFileName, const char* pchWAVEFilename);
NSData* DecodeAMRToWAVE(NSData* data);
NSData* EncodeWAVEToAMR(NSData* data, int nChannels, int nBitsPerSample);

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