Vorbis dev - Jun 2009 - ogg audio streaming problem

Hi,guys
Hope you are doing well!
I am an ogg format starter, and I am implementing ogg audio streaming.
I meet some problems for streaming.

My application is as follows:
I send download request to server,and server sends the download ogg file to
client side.
when  a certain amount of data is downloaded, and I start to play the ogg
file by using a library.

I use juce c++ library which uses vorbisfile.c to read and write ogg format.

I updated the lengthInSamples of the ogg file to the size of ogg file.
After certain chunk of data is downloaded,
ogg length in samples is initialized by

        callbacks.read_func = &oggReadCallback;
        callbacks.seek_func = &oggSeekCallback;
        callbacks.close_func = &oggCloseCallback;
        callbacks.tell_func = &oggTellCallback;

        const int err = ov_open_callbacks (input, &ovFile, 0, 0, callbacks);

    lengthInSamples = (uint32) ov_pcm_total (&ovFile, -1);
input is the file stream.

The first chunk data is played excellent, however, after that , it gives me
static noise.
I debugged the decoder, and it seems that the ogg pattern is not decoded
right in this case.
In vorbisfile.c
static long _get_data(OggVorbis_File *vf){
....
  long bytes=(vf->callbacks.read_func)(buffer,1,CHUNKSIZE,vf->datasource);
..
}

The buffer should hold the header feild "oggs", however, it did not.
I think the problem is vf->seekable = 1.
if the vf->seekable = 1, is it the problem for streaming? How can I achieve
ogg streaming?

Thank you in advance!

Leon
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> My application is as follows:
> I send download request to server,and server sends the download ogg file to
> client side.
> when? a certain amount of data is downloaded, and I start to play the ogg
> file by using a library.
[...]

You've set up the code to treat the file as seekable and complete.
> I think the problem is vf->seekable = 1.
> if the vf->seekable = 1, is it the problem for streaming? How can I
achieve
> ogg streaming?
Yes.  In your case I think the easiest way to do streaming is to pass
in a seek callback of 'NULL'.  Vorbisfile will detect that seeking
isn't possible and treat the file as a progressive stream.

Monty