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75 lines
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75 lines
0 B
1 year ago
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//
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// amrFileCodec.h
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// amrDemoForiOS
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//
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// Created by Tang Xiaoping on 9/27/11.
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// Copyright 2011 test. All rights reserved.
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//
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#ifndef amrFileCodec_h
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#define amrFileCodec_h
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "interf_dec.h"
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#include "interf_enc.h"
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#define AMR_MAGIC_NUMBER "#!AMR\n"
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#define PCM_FRAME_SIZE 160 // 8khz 8000*0.02=160
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#define MAX_AMR_FRAME_SIZE 32
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#define AMR_FRAME_COUNT_PER_SECOND 50
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typedef struct
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{
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char chChunkID[4];
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int nChunkSize;
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}XCHUNKHEADER;
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typedef struct
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{
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short nFormatTag;
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short nChannels;
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int nSamplesPerSec;
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int nAvgBytesPerSec;
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short nBlockAlign;
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short nBitsPerSample;
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}WAVEFORMAT;
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typedef struct
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{
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short nFormatTag;
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short nChannels;
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int nSamplesPerSec;
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int nAvgBytesPerSec;
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short nBlockAlign;
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short nBitsPerSample;
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short nExSize;
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}WAVEFORMATX;
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typedef struct
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{
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char chRiffID[4];
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int nRiffSize;
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char chRiffFormat[4];
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}RIFFHEADER;
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typedef struct
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{
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char chFmtID[4];
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int nFmtSize;
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WAVEFORMAT wf;
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}FMTBLOCK;
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// WAVE音频采样频率是8khz
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// 音频样本单元数 = 8000*0.02 = 160 (由采样频率决定)
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// 声道数 1 : 160
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// 2 : 160*2 = 320
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// bps决定样本(sample)大小
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// bps = 8 --> 8位 unsigned char
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// 16 --> 16位 unsigned short
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int EncodeWAVEFileToAMRFile(const char* pchWAVEFilename, const char* pchAMRFileName, int nChannels, int nBitsPerSample);
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// 将AMR文件解码成WAVE文件
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int DecodeAMRFileToWAVEFile(const char* pchAMRFileName, const char* pchWAVEFilename);
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#endif
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