wav音频的录制-->转成amr

// // 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" #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); #endif