更改WAV文件内容 [英] Change WAV file contents

问题描述

我正在尝试切断wav文件中的部分声音。



这个程序实际上切断了正面声音。但我认为声音的最后部分与原始的wav文件相比是重复的。可能我猜我没有改变格式内容。那么我该如何更改文件格式内容？如Chunksize或BlockAlign..etc？



最后是否有可能在原始文件中写入并删除一些数据？因为它不能正常工作，我复制原始的wav文件使test.wav切断



需要你的帮助

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

推荐答案

引用：

最后是否有可能在原始文件中写入和删除一些数据？由于它不能很好地工作，我复制原始的wav文件使test.wav切断

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

你需要知道所有的字段是什么它们代表：

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



一些例子：

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

您还必须调整标题（块和子块）数据以匹配新（缩短）文件的大小。假设文件使用RIFF_WAVE格式，您可以使用以下结构：

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:

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 指定以下fmt块的大小，该块可能是 WAVEFORMAT ， PCMWAVEFORMAT 或 WAVEFORMATEX 结构（在 mmsystem.h 中定义）。之后是包含原始声音数据的数据部分。



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

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/[^]

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