flac dev - Sep 2004 - Using libFLAC++

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I'm attempting to add flac playback to my app, and would like a couple of 
pointers.  First of all, I'm very much a "learn by seeing other people
doing"
sort of programmer, and would love a pointer to an open-source app that uses 
libFLAC++, so I could see how they do it.  Second, I'm having problems with 
my simple test app (i.e. this isn't how I will use it in my app, I just want
to get a feel for programming with the flac api).  I've inherited from 
FLAC::Decoder:File, and am now implementing a "::Play" function, that
will
eventually take a file name as a parameter and play it.  I've 
stub-implemented all the required functions (meta,error, and write_callback).  
However, when I do the following, it prints 7, which appears to be 
FLAC__FILE_DECODER_INVALID_CALLBACK, meaning I haven't set up one of the 
callbacks that I need to.  

bool FlacDecoder::play(const char *filename)
{
    FLAC__FileDecoderState fstate;
    set_filename(filename);

    fstate = FLAC__file_decoder_init(decoder_);
    cout << fstate << endl;

    return true;
}

Now, I thought the main difference between libFLAC and libFLAC++ was that in 
c++ you didn't have to manually set the callbacks, just inherit and they 
would be set for you.  Am I miss reading the docs there?  Of course, probably 
the #1 problem here is that I'm pretty lost in C-land, and am almost 
undoubtably doing something stupid.  But hey! Helping newbies gives good 
karma ;-)

Thanks for any advice/pointers you can give.  Full source-code (not that much 
more than this) available upon request.

D.A.Bishop
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On Sun, Feb 16, 2003 at 01:05:06PM +0100, Miroslav Lichvar
wrote:
> On Sat, Feb 15, 2003 at 06:18:12PM -0700, David Bishop wrote:
> > I'm attempting to add flac playback to my app, and would like a
couple of
> > pointers.  First of all, I'm very much a "learn by seeing
other people doing"
> > sort of programmer, and would love a pointer to an open-source app
that uses
> > libFLAC++, so I could see how they do it.
> 
> In flac sources there is an example: src/test_libFLAC++/decoders.cpp
I found that a little while after sending the email.  Very good (readable) code!
Thanks!

D.A.Bishop

On Sat, Feb 15, 2003 at 06:18:12PM -0700, David Bishop
wrote:
> I'm attempting to add flac playback to my app, and would like a couple
of
> pointers.  First of all, I'm very much a "learn by seeing other
people doing"
> sort of programmer, and would love a pointer to an open-source app that
uses
> libFLAC++, so I could see how they do it.
In flac sources there is an example: src/test_libFLAC++/decoders.cpp
> Second, I'm having problems with 
> my simple test app (i.e. this isn't how I will use it in my app, I just
want
> to get a feel for programming with the flac api).  I've inherited from 
> FLAC::Decoder:File, and am now implementing a "::Play" function,
that will
> eventually take a file name as a parameter and play it.  I've 
> stub-implemented all the required functions (meta,error, and
write_callback).
> However, when I do the following, it prints 7, which appears to be 
> FLAC__FILE_DECODER_INVALID_CALLBACK, meaning I haven't set up one of
the
> callbacks that I need to.  
> 
> bool FlacDecoder::play(const char *filename)
> {
>     FLAC__FileDecoderState fstate;
>     set_filename(filename);
> 
>     fstate = FLAC__file_decoder_init(decoder_);
This is wrong. It should be:
      fstate = init();
>     cout << fstate << endl;
> 
>     return true;
> }
> 
[...]

-- 
Miroslav Lichvar