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: Victor L. <vic...@nu...> - 2007-08-11 07:49:02
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yes, a SetSr() method would have to close the
device/file/etc,
that's why it's not there.
Regards
Victor
>
> 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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