Re: [Sndobj-devel] Python SNdIO /Core Audio SetSr
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Re: [Sndobj-devel] Python SNdIO /Core Audio SetSr
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From: Edward H. <ed....@gm...> - 2007-08-11 03:11:37
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Hi
It also occurs to me that adding a SetSr method to SndIO base class would be
relatively easy but it has more side effects cf
the SetVectorSize method already there.
In fact I don't see that this would need to be much more than
void SndIO::SetSr(float sr){
m_sr = sr;
}
Best
Ed
On 8/11/07, Edward Hartley <ed....@gm...> wrote:
>
> Yes I've had that as well IIRC correctly I added some helper methods
> to the .i file for the video library I wrapped (I'd have to go back to
> it on another machine to check) but in this case another
> overloaded constructor added (I assume, correct me if I'm wrong) to
> SndCoreAudio.cpp SndCoreAudio.h before rebuilding the library would be
> straightforward. I'll tackle that later on today.
> Cheers
> Ed
>
> On 8/10/07, Victor Lazzarini <vic...@nu...> wrote:
> > Another thing you can try straight away is to
> > use SndRTIO, which on OSX is effectively SndCoreAudio,
> > but with the important difference that its constructor
> > is
> >
> > SndRTIO(short ch, int mode, int bsize = DEF_BSIZE,
> > int period = DEF_PERIOD, int encoding = SHORTSAM,
> > SndObj** input=0, int vsize= DEF_VECSIZE, float sr=DEF_SR,
> > int dev = DEF_DEV)
> >
> > without any Uint32 (in fact, there is a slight bug in
> > there in that the conversion from int to uint is not
> > handled, but I can fix that if there is a problem).
> >
> > Victor
> >
> > >
> > > Problem is the constructor still expects 8 args not the 7
> > > you suggest I introduced the sndobj.SND_OUTPUT argument to
> > > provide the 8th. I think this is a prototyping issue in
> > > SWIG though my close familiarity with SWIG predates the
> > > C++ extensions. However I note the the cpp source
> > > constructor is SndCoreAudio::SndCoreAudio(int channels,int
> > > bufframes, int buffnos, float norm, SndObj** inObjs,
> > > UInt32 dev, int vecsize, float sr)
> > > i.e. 8 args the 6th being the device.
> > >
> > > The python traceback remains as follows irrespective of
> > > whether 7 or 8 args are provided or whether
> > > sndobj.SND_OUTPUT or a python int is passed.
> > >
> > >
> > > File "aif.py", line 20, in <module>
> > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0, objsp,
> > > 256, 22050.0) #wrong args number
> > > File "/Users/edh/Contracts/StAndrews_1/sndobj/sndobj.py"
> > > , line 2803, in __init__
> > > this = _sndobj.new_SndCoreAudio(*args)
> > > NotImplementedError: Wrong number of arguments for
> > > overloaded function 'new_SndCoreAudio'.
> > > Possible C/C++ prototypes are:
> > > SndCoreAudio(int,int,int,float,SndObj **,UInt32,int
> > > ,float)
> > > SndCoreAudio(int,int,int,float,SndObj **,UInt32,int)
> > > SndCoreAudio(int,int,int,float,SndObj **,UInt32)
> > > SndCoreAudio(int,int,int,float,SndObj **)
> > > SndCoreAudio(int,int,int,float)
> > > SndCoreAudio(int,int,int)
> > > SndCoreAudio(int,int)
> > > SndCoreAudio(int)
> > > SndCoreAudio()
> > >
> > > I suspect that the constructor is looking for a C++ Uint32
> > > in the 6th argument but where to pick an appropriate one
> > > from?
> > >
> > > if sndobj.DEF_DEV is substituted for the 6th arg the
> > > following traceback is obtained:
> > > 22050.0 256 which is reasonable enough as this is another
> > > function reference.
> > >
> > > Python(620,0xa000d000) malloc: *** Deallocation of a
> > > pointer not malloced: 0x613158; This could be a double
> > > free(), or free() called with the middle of an allocated
> > > block; Try setting environment variable MallocHelp to see
> > > tools to help debug Python(620,0xa000d000) malloc: ***
> > > Deallocation of a pointer not malloced: 0x709458; This
> > > could be a double free(), or free() called with the middle
> > > of an allocated block; Try setting environment variable
> > > MallocHelp to see tools to help debug
> > > Python(620,0xa000d000) malloc: *** Deallocation of a
> > > pointer not malloced: 0x7bdcf0; This could be a double
> > > free(), or free() called with the middle of an allocated
> > > block; Try setting environment variable MallocHelp to see
> > > tools to help debug
> > >
> > > I can't see anything obvious in SndCoreAudio.h or
> > > AudioDefs.i Ed
> > >
> > > On 8/10/07, Victor Lazzarini <vic...@nu...>
> > > > wrote: Try
> > > >
> > > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0, objsp
> > > > ,256, 22050.0)
> > > >
> > > > There is no sndobj.SND_OUTPUT argument for
> > > > SndCoreAudio (it always opens full-duplex).
> > > >
> > > > Victor
> > > >
> > > >
> > > > >
> > > > > Thanks for the pointer to the solution however
> > > > >
> > > > > now I've removed the constructor
> > > > >
> > > > > outp = sndobj.SndCoreAudio()
> > > > >
> > > > > and after constructing aif1,aif2 replaced it with
> > > > >
> > > > > objs[0]=aif1
> > > > > objs[1]=aif2
> > > > > objsp = objs.cast()
> > > > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0, objsp)
> > > > > which as expected still produces output at the wrong
> > > > > sampling rate however if I extend this to
> > > > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0, objsp ,
> > > > > sndobj.SND_OUTPUT, 256, 22050)
> > > > > or
> > > > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0, objsp ,
> > > > > 1) or variants in between I get tracebacks similar to
> > > > this >
> > > > > File "aif.py", line 20, in <module>
> > > > > outp = sndobj.SndCoreAudio(2, 512, 4, 32767.0,
> > > > > objsp, 1) #, 256, 22050) #wrong args number
> > > > > File
> > > > > "/Users/edh/Contracts/StAndrews_1/sndobj/sndobj.py" ,
> > > > > line 2803, in __init__ this =
> > > > > _sndobj.new_SndCoreAudio(*args) NotImplementedError:
> > > > > Wrong number of arguments for overloaded function
> > > > > 'new_SndCoreAudio'. Possible C/C++ prototypes are:
> > > > > SndCoreAudio(int,int,int,float,SndObj **,UInt32
> > > > > ,int ,float)
> > > > > SndCoreAudio(int,int,int,float,SndObj **,UInt32
> > > > > ,int) SndCoreAudio(int,int,int,float,SndObj **
> > > > > ,UInt32) SndCoreAudio(int,int,int,float,SndObj **)
> > > > > SndCoreAudio(int,int,int,float)
> > > > > SndCoreAudio(int,int,int)
> > > > > SndCoreAudio(int,int)
> > > > > SndCoreAudio(int)
> > > > > SndCoreAudio()
> > > > >
> > > > > Best
> > > > > Ed
> > > > >
> > > > > On 8/9/07, Victor Lazzarini <vic...@nu...>
> > > > > > wrote: You will need to set the SR on all objects
> > > > > > to 22050. It is generally the last argument
> > > > > > (which defaults to 44100) of each object. You
> > > > > > have done it with all SndObjs, but it looks
> > > > > > like you left the SndCoreAudio to its default.
> > > > > > You need to create it with the right SR.
> > > > > >
> > > > > > Victor
> > > > > >
> > > > > > >
> > > > > > > Hi
> > > > > > > I've been tinkering with PySndObj on the Mac .
> > > > > > > BTW it built out of the box for python 2.5 with
> > > > > > > the MacPython framework and appropriate build
> > > > > > > switches to build the python wrapper. The examples
> > > > > > > work OK as does the I have now got to the point
> > > > > > > where I'm able to read an AIF file and providing
> > > > > > > it's a PCM file get it to play back OK apart from
> > > > > > > when the sampling rate is not the default 44100.
> > > > > > > In the case in question it is 22050 but it plays
> > > > > > > back as if 44100. (Thanks BTW to the wav file
> > > > > > > example post) I have tried the commented options
> > > > > > > shown in the code below, I'm new to the API so I'm
> > > > > > > not sure if this is a bug or I'm not setting the
> > > > > > > sampling rate in the right place. So suggestions
> > > > > > welcomed. The example file is in the
> > > > > > > /Developer/Examples/Java/Sound source tree. >
> > > > > > > import sndobj fn = '22-new.aif'
> > > > > > > #fn = 'sound.aif'
> > > > > > > af = sndobj.SndAiff(fn,sndobj.READ,2)
> > > > > > > sr = af.GetSr()
> > > > > > > vs = af.GetVectorSize()
> > > > > > > print sr,vs
> > > > > > > T1 = sndobj.SndThread()
> > > > > > > sndin = sndobj.SndIn(af,1)
> > > > > > > outp = sndobj.SndCoreAudio()
> > > > > > > aif1 = sndobj.SndIn(af,1)
> > > > > > > #aif1 = sndobj.SndIn(af,1,vs,sr)
> > > > > > > #aif1.SetSr(sr)
> > > > > > > aif2 = sndobj.SndIn(af,2)
> > > > > > > #aif2 = sndobj.SndIn(af,2, vs, sr)
> > > > > > > #aif2.SetSr(sr)
> > > > > > > outp.SetOutput(1,aif1)
> > > > > > > outp.SetOutput(2,aif2)
> > > > > > > T1.AddObj(af,sndobj.SNDIO_IN)
> > > > > > > T1.AddObj(aif1)
> > > > > > > T1.AddObj(aif2)
> > > > > > > T1.AddObj(outp,sndobj.SNDIO_OUT)
> > > > > > > T1.ProcOn()
> > > > > > > time.sleep(5)
> > > > > > > T1.ProcOff()
> > > > > > >
> > > > > > > TIA
> > > > > > > Ed
> > > > > > >
> > > > > > >
> > > > > > >
> > > > >
> > > > > > >
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