封裝成wav格式文件

wav.h

// name:wav.h #ifndef _WAV_H_ #define _WAV_H_ #ifndef U8 #define U8 unsigned char #endif #ifndef U16 #define U16 unsigned short #endif #ifndef U32 #define U32 unsigned int #endif #ifndef U64 #define U64 unsigned long #endif struct RIFF_HEADER { U8 szRiffID[4]; // 'R','I','F','F' U32 dwRiffSize; // 整個wav文件大小減去szRiffID和szRiffFormat所佔用的字節數 U8 szRiffFormat[4]; // 'W','A','V','E' }; struct WAVE_FORMAT { U16 wFormatTag; // 編碼方式，u-law:7 a-law:6 U16 wChannels; // 聲道數目，1--單聲道；2--雙聲道 U32 dwSamplesPerSec; // 採樣頻率 U32 dwAvgBytesPerSec; // 通道數×每個採樣數據寬度 X 採樣頻率/8 U16 wBlockAlign; // 數據塊對齊單位(每個採樣需要的字節數) PCMU 1 byte U16 wBitsPerSample; // 每個採樣需要的bit數 PCMU 8bit U8 pack[2]; // 附加信息 }; struct FMT_BLOCK { U8 szFmtID[4]; // 'f','m','t',' ' U32 dwFmtSize; // 有附加信息時爲18，沒有附加信息爲16 struct WAVE_FORMAT wavFormat; }; /* Fact Chunk是可選字段，一般當wav文件由某些軟件轉化而成，則包含該Chunk。 */ struct FACT_BLOCK { U8 szFactID[4]; // 'f','a','c','t' U32 dwFactSize; // 從下一個字節開始到szDataID之間的字符數 }; struct DATA_BLOCK { U8 szDataID[4]; // 'd','a','t','a' U32 dwDataSize; }; #endif

 

 

 

wav_file_formate.c

// name: wav_file_formate.c #include <stdio.h> #include <stdlib.h> // exit() #include<string.h> // bzero() #include<sys/time.h> #include<sys/types.h> #include<unistd.h> #include<sys/stat.h> /*stat用到*/ #include "wav.h" #define RAW_SIZE 1024*50 #define TMEP_BUFFER_SIZE 200 unsigned long get_file_size(const char *filename) { struct stat buf; if(stat(filename, &buf)<0) { return 0; } return (unsigned long)buf.st_size; } int main(int argc,char* argv[]) { struct RIFF_HEADER riff_header; struct FMT_BLOCK fmt_block; struct FACT_BLOCK fact_block; struct DATA_BLOCK data_block; FILE *wav_in; FILE *wav_out; unsigned long raw_size; if(argc != 3 ) { printf("Usage:/n/t%s <intput file> <output file>/n", argv[0]); exit(-1); } //char name_in[] = "test.g711"; wav_in = fopen(argv[1],"rb"); if(wav_in == NULL) { printf("Can't open input file %s/n", argv[1]); return (-1); } //char name_out[] = "test.wav"; wav_out = fopen(argv[2], "wb"); if( wav_out == NULL) { printf("Can't open output file %s/n",argv[2]); fclose(wav_in); return(-1); } raw_size = get_file_size(argv[1]); if(raw_size == 0) { printf("get_file_size error/n"); return (-1); } printf("raw size is %d/n",raw_size); unsigned int temp_dwRiffSize = sizeof(riff_header) + sizeof(fmt_block) / + sizeof(data_block) + raw_size - 8; memmove(riff_header.szRiffID,"RIFF",4); riff_header.dwRiffSize = temp_dwRiffSize; // ========== memmove(riff_header.szRiffFormat,"WAVE",4); memmove(fmt_block.szFmtID,"fmt ",4); fmt_block.dwFmtSize = 18; // ========== fmt_block.wavFormat.wFormatTag = 0x06; fmt_block.wavFormat.wChannels = 0x01; fmt_block.wavFormat.dwSamplesPerSec = 0x1F40; fmt_block.wavFormat.dwAvgBytesPerSec = 0x1F40; fmt_block.wavFormat.wBlockAlign = 0x01; fmt_block.wavFormat.wBitsPerSample = 0x08; //memmove(fmt_block.wavFormat.pack," ",2); memmove(data_block.szDataID,"data",4); data_block.dwDataSize = raw_size; // ========== int ret; ret = fwrite(&riff_header,sizeof(riff_header),1,wav_out); if(ret < 0) { perror("riff_header fwrite"); exit(0); } ret = fwrite(&fmt_block,sizeof(fmt_block) - 2,1,wav_out); if(ret < 0) { perror("fmt_block fwrite"); exit(0); } ret = fwrite(&data_block,sizeof(data_block),1,wav_out); if(ret < 0) { perror("data_block fwrite"); exit(0); } char temp_char; while(!feof(wav_in)) { temp_char = fgetc(wav_in); if(ret < 0) { perror("fread"); break; } ret = fputc(temp_char,wav_out); if(ret < 0) { perror("fwrite"); break; } } fclose(wav_in); fclose(wav_out); return 0; }

 

編譯wav_file_formate.c

yuan@yuan:~/work/test/wav_file_formate> gcc -o wav_file_formate wav_file_formate.c

 

運行程序，從文件test.g711文件讀取raw數據並封裝成test.wav文件中

yuan@yuan:~/work/test/wav_file_formate> ./wav_file_formate test.g711 test.wav

 

生成test.wav文件，用播放器可以直接打開。

 

感謝前輩們的分享：

http://blog.csdn.net/pyundeng/archive/2006/10/24/1348936.aspx
http://www.cnitblog.com/liaoqingshan/archive/2008/09/02/48651.html
http://www.cnitblog.com/tinnal/archive/2009/01/03/53401.html
http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html