Wav file parsing

Wave file format description:

	Offset address	Bytes	Data Type	Internal capacity
File Header	00 h	4	Char	"Riff" flag
04 H	4	Long int	File Length
08 h	4	Char	"Wave" flag
0ch	4	Char	"FMT" flag
10 h	4		Transition bytes (not fixed)
14 h	2	Int	Format category (10 h for PCM audio data)
16 h	2	Int	Number of channels, 1 for single channel, 2 for dual channels
18 h	4	Int	Sampling rate (number of samples per second), indicating the playback speed of each channel,
1ch	4	Long int	The transmission rate of waveform audio data. The value is the number of channels × the number of data digits per second × the number of data digits per sample/8. The playback software can use this value to estimate the buffer size.
20 h	2	Int	The number of adjustment data blocks (calculated in bytes). The value is the number of channels × the data bit value per sample/8. The playback software needs to process multiple bytes of data of this value at a time to adjust the value for the buffer zone.
22 h	2		The number of data digits of each sample, indicating the number of data digits of each sample in each channel. If multiple channels exist, the sample size is the same for each channel.
24 h	4	Char	DATA tag "data"
28 h	4	Long int	Length of Speech Data

Storage Method of PCM Data:

	Sample 1	Sample 2
8-Bit Single Channel	0-Channel	0-Channel
8-bit stereo	0 channels (left)	1-channel (right)	0 channels (left)	1-channel (right)
16-Bit Single Channel	0-channel low byte	0-channel high byte	0-channel low byte	0-channel high byte
16-bit stereo	0-channel (left) Low byte	0-channel (left) high byte	1-channel (right) Low byte	1-channel (right) high byte

Read all the fields in the wav file and write a new WAV file: wav_write.cpp.

# Include <iostream> # include <fstream> # include <string. h> # include <math. h> # include <cmath> # include <stdlib. h >#include <bitset ># include <iomanip> using namespace STD; struct my_wave {unsigned long chunckid; unsigned long chunksize; unsigned long format; unsigned long interval; unsigned long subchunk1size; unsigned short audioformat; unsigned short duration; unsigned long byterate; unsigned short blockalign; unsigned short duration; unsigned long duration; unsigned char * z_data ;}; int main (INT argc, char ** argv) {ifstream FS; ofstream OFS; my_wave MW; // read the original file FS. open ("f :\\ wave.wav", IOS: Binary | IOs: In); // you need to change this sentence to your file path ofs. open ("F: \ waveout.wav", IOS: Binary | IOs: Out); // write the file to be read to a new file // read all the fields of the wav file FS. seekg (0); FS. read (char *) & mW. chunckid, sizeof (MW. chunckid); FS. seekg (0x04); FS. read (char *) & mW. chunksize, sizeof (MW. chunksize); FS. seekg (0x08); FS. read (char *) & mW. format, sizeof (MW. format); FS. seekg (0x0c); FS. read (char *) & mW. subchunk1id, sizeof (MW. subchunk1id); FS. seekg (0x10); FS. read (char *) & mW. subchunk1size, sizeof (MW. subchunk1size); FS. seekg (0x14); FS. read (char *) & mW. audioformat, sizeof (MW. audioformat); FS. seekg (0x16); FS. read (char *) & mW. numchannels, sizeof (MW. numchannels); FS. seekg (0x18); FS. read (char *) & mW. samplerate, sizeof (MW. samplerate); FS. seekg (0x1c); FS. read (char *) & mW. byterate, sizeof (MW. byterate); FS. seekg (0x20); FS. read (char *) & mW. blockalign, sizeof (MW. blockalign); FS. seekg (0x22); FS. read (char *) & mW. bitspersampel, sizeof (MW. bitspersampel); FS. seekg (0x24); FS. read (char *) & mW. subchunk2id, sizeof (MW. subchunk2id); FS. seekg (0x28); FS. read (char *) & mW. subchunk2size, sizeof (MW. subchunk2size); mW. z_data = new unsigned char [mW. subchunk2size]; FS. seekg (0x2c); FS. read (char *) mW. z_data, sizeof (char) * mW. subchunk2size); // output all fields of the wav file for testing the cout <mW. chunckid <Endl; cout <mW. chunksize <Endl; cout <mW. format <Endl; cout <mW. subchunk1id <Endl; cout <mW. subchunk1size <Endl; cout <mW. audioformat <Endl; cout <mW. numchannels <Endl; cout <mW. samplerate <Endl; cout <mW. byterate <Endl; cout <mW. blockalign <Endl; cout <mW. bitspersampel <Endl; cout <mW. subchunk2id <Endl; cout <mW. subchunk2size <Endl; cout <"sample data:" <Endl; For (int K = 0; k <mW. subchunk2size; k ++) {printf ("% x", mW. z_data [k]);} // write each field to the OFS in The New. Wav file. write (char *) & mW. chunckid, sizeof (MW. chunckid); ofs. write (char *) & mW. chunksize, sizeof (MW. chunksize); ofs. write (char *) & mW. format, sizeof (MW. format); ofs. write (char *) & mW. subchunk1id, sizeof (MW. subchunk1id); ofs. write (char *) & mW. subchunk1size, sizeof (MW. subchunk1size); ofs. write (char *) & mW. audioformat, sizeof (MW. audioformat); ofs. write (char *) & mW. numchannels, sizeof (MW. numchannels); ofs. write (char *) & mW. samplerate, sizeof (MW. samplerate); ofs. write (char *) & mW. byterate, sizeof (MW. byterate); ofs. write (char *) & mW. blockalign, sizeof (MW. blockalign); ofs. write (char *) & mW. bitspersampel, sizeof (MW. bitspersampel); ofs. write (char *) & mW. subchunk2id, sizeof (MW. subchunk2id); ofs. write (char *) & mW. subchunk2size, sizeof (MW. subchunk2size); ofs. write (char *) mW. z_data, sizeof (char) * mW. subchunk2size); FS. close (); ofs. close (); Delete [] mW. z_data; System ("pause ");}

Wav file parsing