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Editorial Team
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Asked: 2026-06-11T04:00:44+00:00

I want to split a Multichannel (2,8 or 16) wav file into its channels

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I want to split a Multichannel (2,8 or 16) wav file into its channels and save every channel in another wav-File.

So far I’ve accomplished to get libsox up and running in my c++, objective c++ project.

Libsox isnt well documented and there aren many examples on how to do it 🙁

I started by first openning the Inputfile

sox_format_t * in, * out;
assert(sox_init() == SOX_SUCCESS);
assert(in = sox_open_read((const char*)filename.c_str(),NULL,NULL,NULL));

Now I must find a way to get the number of channels of this file. Then I have to create the same amount of out-files and save every channel itself inside them.

How to do?

Thanks!

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1 Answer

  1. Editorial Team

    I think I will do it the old fashioned way.

    • Determine the channel count of the file.

    • Determine the length of the Data block.

      Length of Data block / channelCount = Size of each channelBlock

    • Channels are saved like that inside a WavFile-Datablock (for 4Channel WavFile)
      CH1/Ch2/Ch3/Ch4 CH1/Ch2/Ch3/Ch4.

    • I run through the datablock extract the channels and put them into a mono-wav-file
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