c - libsox 转换 wav 文件采样率等。

Question

编辑:我想使用 libsox 以编程方式转换 wav 文件的采样率、音频格式、 channel 等。

在 libsox 手册页中，有很多我可以使用的函数，但我完全不知道该怎么做。任何人都可以给我一些关于如何做的步骤吗？

帮忙吗？

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有人能解释一下吗？

   The  function  sox_write  writes  len samples from buf using the format
   handler specified by ft. Data in buf must be 32-bit signed samples  and
   will  be converted during the write process. The value of len is speci-
   fied in total samples. If its value is not evenly divisable by the num-
   ber of channels, undefined behavior will occur.

Answer 1

我推荐 libsndfile 和 libsamplerate 的组合

http://www.mega-nerd.com/SRC

SRC provides a small set of converters to allow quality to be traded off against computation cost. The current best converter provides a signal-to-noise ratio of 145dB with -3dB passband extending from DC to 96% of the theoretical best bandwidth for a given pair of input and output sample rates.

http://www.mega-nerd.com/libsndfile/

• Ability to read and write a large number of file formats.
• A simple, elegant and easy to use Applications Programming Interface.
• Usable on Unix, Win32, MacOS and others.
• On the fly format conversion, including endian-ness swapping, type conversion and bitwidth scaling.
• Optional normalisation when reading floating point data from files containing integer data.
• Ability to open files in read/write mode.
• The ability to write the file header without closing the file (only on files open for write or read/write).
• Ability to query the library about all supported formats and retrieve text strings describing each format.