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[Robert Bailey]

On 2014-02-02, at 12:00 PM, vorbis-request at xiph.org wrote:

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> Today's Topics:
> 
>   1. Trouble implementing ov_callbacks,	endless loop calling
>      seek_func (Rich E)
> 
> From: Rich E <reakinator at gmail.com>
> Subject: [Vorbis] Trouble implementing ov_callbacks, endless loop calling seek_func
> Date: 2 February, 2014 1:54:15 AM PST
> To: vorbis at xiph.org
> 
> 
> Hello list,
> 
> I've been having a tough time adding windows resource support to my ogg vorbise decoder, although I think I am close. Basically when I call ov_open_callbacks(), it doesn't ever return and repeatedly calls my seek_func.
> 
> I'm hoping it is something obvious, but I can't see why my seek_func is being called endlessly.  If the file is seekable, I should return 0, right? If any one can take a look at the following callback functions and see if they can spot what I'm doing wrong, it'd be much appreciated:
> 
> size_t SourceFileImplOggVorbis::readFn( void *ptr, size_t size, size_t nmemb, void *datasource )
> {
> 	auto sourceFile = (SourceFileImplOggVorbis *)datasource;
> 
> 	size_t bytes = size * nmemb;
> 	sourceFile->mStream->readData( ptr, bytes );
> 
> 	return nmemb;
> }
> 
> int SourceFileImplOggVorbis::seekFn( void *datasource, ogg_int64_t offset, int whence )
> {
> 	auto sourceFile = (SourceFileImplOggVorbis *)datasource;
> 
> 	switch( whence ) {
> 		case SEEK_SET:
> 			sourceFile->mStream->seekAbsolute( (off_t)offset );
> 			break;
> 		case SEEK_CUR:
> 			sourceFile->mStream->seekRelative( (off_t)offset );
> 			break;
> 		case SEEK_END:
> 			sourceFile->mStream->seekAbsolute( (off_t)( - offset ) );
> 			break;
> 		default:
> 			CI_ASSERT_NOT_REACHABLE();
> 			return -1;
> 	}
> 
> 	return 0;
> }
> 
> int	SourceFileImplOggVorbis::closeFn( void *datasource )
> {
> 	return 0;
> }
> 
> long SourceFileImplOggVorbis::tellFn( void *datasource )
> {
> 	auto sourceFile = (SourceFileImplOggVorbis *)datasource;
> 
> 	long pos = sourceFile->mStream->tell();
> 
> 	return pos;
> }
> 
> The source file for this code can also be found here.
> 
> Thanks a ton,
> Rich
> 
> 
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Robert Bailey
rob at the-treehouse-studio.com



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