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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;

}FMTBLOCK;

// 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

// 2 : 160*2 = 320

// 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);

#endif