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Swig + Numpy.i with a const int16_t pointer

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  Swig + Numpy.i with a const int16_t pointer shriphanip@gmail.com - 2015-11-10 17:09 -0800
    Re: Swig + Numpy.i with a const int16_t pointer Christian Gollwitzer <auriocus@gmx.de> - 2015-11-12 09:46 +0100
      Re: Swig + Numpy.i with a const int16_t pointer Christian Gollwitzer <auriocus@gmx.de> - 2015-11-12 10:16 +0100
        Re: Swig + Numpy.i with a const int16_t pointer Christian Gollwitzer <auriocus@gmx.de> - 2015-11-12 10:17 +0100

#98628 — Swig + Numpy.i with a const int16_t pointer

I am trying to wrap the following function with SWIG so I can call it from Python. The signature is:

```
int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame, size_t frame_length);
```

I have the following SWIG file: https://gist.github.com/shriphani/92c587ea4c32bafc9d97

At the end of this, I get the following error: webrtc_vad.i:22: Warning 453: Can't apply (int16_t const *IN_ARRAY1,unsigned int DIM1). No typemaps are defined.

If I drop the unsigned bit in the signature, then it compiles fine but the function signature is carried as-is (i.e. the function expects an int pointer and all that business).

Does anyone have a solution?

Regards,
Shriphani

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#98683

Am 11.11.15 um 02:09 schrieb shriphanip@gmail.com:
> I am trying to wrap the following function with SWIG so I can call it from Python. The signature is:
>
> ```
> int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame, size_t frame_length);
> ```

This is thing is an array of 16 bit unsigned integers for input. The 
closest object in Python is a numpy array. There is a numpy.i available 
for Python, I'm not sure if it handles this case correctly. If you are 
unlucky, you need to write your own typemap.

	Christian

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#98684

Am 12.11.15 um 09:46 schrieb Christian Gollwitzer:
> Am 11.11.15 um 02:09 schrieb shriphanip@gmail.com:
>> I am trying to wrap the following function with SWIG so I can call it
>> from Python. The signature is:
>>
>> ```
>> int WebRtcVad_Process(VadInst* handle, int fs, const int16_t*
>> audio_frame, size_t frame_length);
>> ```
>
> This is thing is an array of 16 bit unsigned integers for input. The
> closest object in Python is a numpy array. There is a numpy.i available
> for Python, I'm not sure if it handles this case correctly. If you are
> unlucky, you need to write your own typemap.

http://docs.scipy.org/doc/numpy/reference/swig.interface-file.html

It seems that you can create your own typemap easily using the macros 
provided by numpy.i; something like

%numpy_typemaps(int16_t, NPY_UINT16, int)

should be sufficient.

	Christian

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#98685

Am 12.11.15 um 10:16 schrieb Christian Gollwitzer:
> Am 12.11.15 um 09:46 schrieb Christian Gollwitzer:
>> Am 11.11.15 um 02:09 schrieb shriphanip@gmail.com:
>>> I am trying to wrap the following function with SWIG so I can call it
>>> from Python. The signature is:
>>>
>>> ```
>>> int WebRtcVad_Process(VadInst* handle, int fs, const int16_t*
>>> audio_frame, size_t frame_length);
>>> ```
>>
>> This is thing is an array of 16 bit unsigned integers for input. The
>> closest object in Python is a numpy array. There is a numpy.i available
>> for Python, I'm not sure if it handles this case correctly. If you are
>> unlucky, you need to write your own typemap.
>
> http://docs.scipy.org/doc/numpy/reference/swig.interface-file.html
>
> It seems that you can create your own typemap easily using the macros
> provided by numpy.i; something like
>
> %numpy_typemaps(int16_t, NPY_UINT16, int)
>
> should be sufficient.

That should be

  %numpy_typemaps(int16_t, NPY_INT16, int)

of course.
	

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