Change WAV file contents

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I'm trying to cut off a part of sound in a wav file.

This program actually cut off the front sound. but I think the last part of sound is repeated compared to original wav file. Probably I guess I didn't change format contents. So then How can I change file format contents? such as Chunksize or BlockAlign..etc?

lastly Is it possible that write and remove some data in original file?? As it didn't work well, I copied original wav file to make test.wav cut off

Need your help

Posted 4-Apr-13 21:25pm

kyleK89

Updated 4-Apr-13 22:30pm

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Kenneth Haugland · Answer 1 · 2013-04-04T22:15:00

Quote:
lastly Is it possible that write and remove some data in original file?? As it didn't work well, I copied original wav file to make test.wav cut off

You need to know all the fields ond what they represent:
https://ccrma.stanford.edu/courses/422/projects/WaveFormat/[^]

Some examples:
http://www.codeproject.com/search.aspx?q=wave+file&x=0&y=0&sbo=kw[^]

Jochen Arndt · Answer 2 · 2013-04-04T22:31:00

You must also adjust the headers (chunk and sub-chunks) data to match the size of the new (shortened) file. Assuming the file uses RIFF_WAVE format, you can use this structure:

C++

typedef struct {
    char chunkID[4];                // "RIFF"
    DWORD chunkSize;                // file size - 8
    char type[4];                   // "WAVE"
    char fmt[4];                    // "fmt "
    DWORD fmtSize;                  // size of following format section
} RiffHdr_t;

fmtSize specifies the size of the following "fmt " block which may be a WAVEFORMAT, PCMWAVEFORMAT, or WAVEFORMATEX structure (defined in mmsystem.h). After this follows a "data" section containing the raw sound data.

See also https://ccrma.stanford.edu/courses/422/projects/WaveFormat/[^]

Change WAV file contents

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