I am wrapping PortAudio for RPython. Following the source code in RSDL as a
guide i can clearly see what to do with constants, structs, functions and so
on. So far so good until i reached something new in PortAudio i am not sure
how to deal with, a void typedef and a void pointer. In the RSDL example
pointers were defined by Ptr = lltype.Ptr(lltype.ForwardReference()), then in
the CConfig class the struct was defined and rffi_platform.configure parses,
finally the Ptr is told TO become the type - given the output of
platform.configure. How do we deal with this situation from PortAudio?
# from portaudio.h
typedef void PaStream;
PaError Pa_OpenStream( PaStream** stream,
const PaStreamParameters *inputParameters,
const PaStreamParameters *outputParameters,
double sampleRate,
unsigned long framesPerBuffer,
PaStreamFlags streamFlags,
PaStreamCallback *streamCallback,
void *userData );
###############################
I have tried the following but it fails when i try to malloc the void pointer.
OpenDefaultStream = external( 'Pa_OpenDefaultStream',
[
rffi.VOIDPP, # PaStream**
rffi.INT, # numInputChannels
rffi.INT, # numOutputChannels
rffi.INT, # sampleFormat
rffi.INT, # sampleRate
rffi.INT, # framesPerBuffer
rffi.INT, #streamcallback
rffi.VOIDP, #userData
],
rffi.INT
)
Stream = lltype.Void #rffi.VOIDP
def test():
print 'portaudio version %s' %GetVersion()
assert Initialize() == 0 # paNoError = 0, error code is
returned on init fail.
stream = lltype.malloc(Stream, flavor='raw')
try: ok = OpenDefaultStream( stream, 1, 1, Int16, 22050,
FramesPerBufferUnspecified, 0 )
finally: lltype.free(stream, flavor='raw')
Terminate()
-brett
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