Encapsulated into WAV Files

Wav. h

// Name: WAV. h <br/> # ifndef _ wav_h _ <br/> # DEFINE _ wav_h _ <br/> # ifndef u8 <br/> # defineu8unsigned char <br/> # endif <br/> # ifndef 2010< br/> # define 2010unsigned short <br/> # endif <br/> # ifndef u32 <br/> # define u32 unsigned int <br/> # endif <br/> # ifndef u64 <br/> # define u64 unsigned long <br/> # endif <br/> struct riff_header <br/> {<br/> u8 szriffid [4]; // 'R', 'I', 'F', 'F' <br/> u32 dwriffsize; // the size of the whole WAV file minus s Number of bytes occupied by zriffid and szriffformat <br/> u8 szriffformat [4]; // 'w', 'A', 'V ', 'E' <br/>}; <br/> struct wave_format <br/>{< br/> b2wformattag; // encoding method, U-law: 7 A-law: 6 <br/> 2010wchannels; // number of audio channels, 1 -- single channel; 2 -- Dual Channel <br/> u32 dwsamplespersec; // sampling frequency <br/> u32 dwavgbytespersec; // number of channels x width of each sample data x sampling frequency/8 <br/> b2wblockalign; // data block alignment unit (the number of bytes required for each sample) PCMU 1 byte <br/> b2wbitspersample; // The number of bits required for each sample PCMU 8bit <br /> U8 pack [2]; // Additional Information <br/>}; <br/> struct fmt_block <br/>{< br/> u8 szfmtid [4]; // 'F', 'M', 't', ''<br/> u32 dwfmtsize; // when additional information is available, no additional information is 16 <br/> struct wave_format wavformat; <br/>}; <br/>/* fact Chunk is an optional field, generally, a WAV file is converted into a chunk by some software. */<Br/> struct fact_block <br/> {<br/> u8 szfactid [4]; // 'F', 'A', 'C ', 'T' <br/> u32 dwfactsize; // number of characters starting from the next byte to szdataid <br/> }; <br/> struct data_block <br/> {<br/> u8 szdataid [4]; // 'D', 'A','t ', 'A' <br/> u32 dwdatasize; <br/>}; </P> <p> # endif

 

 

 

Wav_file_formate.c

// Name: wav_file_formate.c </P> <p> # include <stdio. h> <br/> # include <stdlib. h> // exit () <br/> # include <string. h> // bzero () <br/> # include <sys/time. h> <br/> # include <sys/types. h> <br/> # include <unistd. h> <br/> # include <sys/STAT. h>/* stat used */</P> <p> # include "WAV. H "<br/> # define raw_size 1024*50 <br/> # define tmep_buffer_size 200 <br/> unsigned long get_file_size (const char * filename) <br/>{< br/> struct sta T Buf; <br/> If (STAT (filename, & BUF) <0) <br/>{< br/> return 0; <br/>}< br/> return (unsigned long) BUF. st_size; <br/>}< br/> int main (INT argc, char * argv []) <br/>{< br/> struct riff_header; <br/> struct fmt_block; <br/> struct fact_block; <br/> struct data_block; <br/> file * wav_in; <br/> file * wav_out; <br/> unsigned long raw_size; <br/> If (argc! = 3) <br/>{< br/> printf ("Usage:/n/T % S <intput File> <output file>/N ", argv [0]); <br/> exit (-1); <br/>}< br/> // char name_in [] = "test. g711 "; <br/> wav_in = fopen (argv [1]," rb "); <br/> If (wav_in = NULL) <br/>{< br/> printf ("can't open input file % s/n", argv [1]); <br/> return (-1 ); <br/>}< br/> // char name_out [] = "test.wav"; <br/> wav_out = fopen (argv [2], "WB "); <br/> If (wav_out = NULL) <br/>{< br/> printf ("Can't open output file % s/n", argv [2]); <br/> fclose (wav_in); <br/> return (-1 ); <br/>}</P> <p> raw_size = get_file_size (argv [1]); <br/> If (raw_size = 0) <br/>{< br/> printf ("get_file_size error/N"); <br/> return (-1 ); <br/>}< br/> printf ("raw size is % d/N", raw_size); <br/> unsigned int temp_dwriffsize = sizeof (riff_header) + sizeof (fmt_block)/<br/> + sizeof (data_block) + raw_size-8; <br/> memmove (riff _ Header. szriffid, "riff", 4); <br/> riff_header.dwriffsize = temp_dwriffsize; // ==========< br/> memmove (riff_header.szriffformat, "wave", 4); <br/> memmove (fmt_block.szfmtid, "FMT", 4); <br/> fmt_block.dwfmtsize = 18; /// ===========< br/> fmt_block.wavformat.wformattag = 0x06; <br/> fmt_block.wavformat.wchannels = 0x01; <br/> mask = 0x1f40; <br/> fmt_block.wavformat.dwavgbytesper SEC = 0x1f40; <br/> fmt_block.wavformat.wblockalign = 0x01; <br/> fmt_block.wavformat.wbitspersample = 0x08; <br/> // memmove(fmt_block.wav format. pack, "", 2); <br/> memmove (data_block.szdataid, "data", 4); <br/> data_block.dwdatasize = raw_size; // ===========< br/> int ret; <br/> ret = fwrite (& riff_header, sizeof (riff_header), 1, wav_out ); <br/> If (Ret <0) <br/> {<br/> perror ("riff_header fwrite"); <br/> exit (0); <Br/>}< br/> ret = fwrite (& fmt_block, sizeof (fmt_block)-2, 1, wav_out); <br/> If (Ret <0) <br/>{< br/> perror ("fmt_block fwrite"); <br/> exit (0 ); <br/>}< br/> ret = fwrite (& data_block, sizeof (data_block), 1, wav_out); <br/> If (Ret <0) <br/>{< br/> perror ("data_block fwrite"); <br/> exit (0 ); <br/>}</P> <p> char temp_char; <br/> while (! Feof (wav_in) <br/>{< br/> temp_char = fgetc (wav_in); <br/> If (Ret <0) <br/>{< br/> perror ("fread"); <br/> break; <br/>}< br/> ret = fputc (temp_char, wav_out ); <br/> If (Ret <0) <br/> {<br/> perror ("fwrite"); <br/> break; <br/>}< br/> fclose (wav_in); <br/> fclose (wav_out); <br/> return 0; <br/>}

 

Compile wav_file_formate.c

Yuan @ Yuan :~ /Work/test/wav_file_formate> gcc-O wav_file_formate wav_file_formate.c

 

Run the program to read rawdata from the file test.g711and pack it into the file test.wav.

Yuan @ Yuan :~ /Work/test/wav_file_formate>./wav_file_formate test. g711 test.wav

 

Generate the test.wav file, which can be opened directly with the player.

 

I would like to thank my predecessors for sharing the following information:

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