Thanks Nicolas,
I learnt a lot from your way of doing it!
Simon
On 13/01/2010 11:17, Nicolas Lelong wrote:
Simon,
it seems that I wrapped the same videoinput library you're using.
I wrapped the getPixels the following way : python script is
responsible of the memory allocation for pixels buffer (in a correctly
sized string).
The getPixels function is wrapped as follows :
namespace {
bool videoInput_getPixels(videoInput& input, int device_id,
python::object memory_buffer)
{
PyObject* pyObject = memory_buffer.ptr();
if (PyString_CheckExact(pyObject))
{
Py_ssize_t string_size = PyString_Size(pyObject);
if (string_size >= Py_ssize_t(input.getWidth(device_id)) *
Py_ssize_t(input.getHeight(device_id)) * Py_ssize_t(3))
{
unsigned char* pixels = reinterpret_cast<unsigned
char*>(PyString_AsString(pyObject));
return input.getPixels(device_id, pixels, false, false);
}
}
return false;
}
};
python::class_<videoInput, boost::noncopyable> klass("VideoInput");
klass.def("getPixels", videoInput_getPixels);
This certainly lacks some error checking for the actual
'memory_buffer' parameter type, but can give you a clue.
HTH,
Nicolas
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