trying to use Accelerate framework's vDSP_vsmul with int16_t?

[Patrick Collins]

I have a buffer, that I just want to essentially modify with:

  for (int i = 0; i < frames; i++) {

    buffer[i] *= gain;

  }

if I do:

  vDSP_vsmul(buffer, 1, &gain, buffer, 1, frames);

I get "No matching function for call to 'vDSP_vsmu"

and if I do:

  vDSP_vsmul((float *)buffer, 1, &gain, (float *)buffer, 1, frames);

then it compiles, but my audio sounds like trash...

How can I get this to work with 16-bit integer samples?

--

Patrick J. Collins
http://collinatorstudios.com

[Ian Ollmann]

vDSP_vsmul is for floating-point data, not int16_t. 

You can try vDSP_vflt16, vDSP_vsmul, vDSP_vfixr16.

The buffers should be small, <4k entries, to get reasonable performance.

Ian

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