Vorbis - 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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leon deng wrote:
> I am an ogg format starter, and I am implementing ogg audio streaming.
> I meet some problems for streaming.
>         callbacks.read_func = &oggReadCallback;
>         callbacks.seek_func = &oggSeekCallback;
>         callbacks.close_func = &oggCloseCallback;
>         callbacks.tell_func = &oggTellCallback;
> The first chunk data is played excellent, however, after that , it gives
> me static noise.
> if the vf->seekable = 1, is it the problem for streaming? How can I
> achieve ogg streaming?
Yes, that is your problem. "seekable" is the opposite of
"streaming".
Either set callbacks.seek_func to NULL, or make sure your
oggSeekCallback returns -1.

Peter Harris
-- 
               Open Text Connectivity Solutions Group
Peter Harris                    http://www.opentext.com/connectivity
Research and Development        Phone: +1 905 762 6001
pharris at opentext.com            Toll Free: 1 877 359 4866