[vorbis] developing with libvorbis

[Ed Sweetman]

Sune Foldager wrote:
> On thursday, march 27, 2003, at 01:35 (Europe/Copenhagen time), Ed 
> Sweetman wrote:
> 
>> In the example decoder it writes data in varying lengths to stdout, is 
>> it possible to alter the decoder to write the same length data to 
>> stdout every time?  Rather, how would you alter the decoder to do 
>> that.  It seems to be writing everything from 512 to 4096 bytes each 
>> time and i cant really see why this is and how to change it.
> 
> 
> This is because the decoder doesn't decode farther than the current 
> frame. Make a small loop, repeatedly calling the decode function until 
> you get the amount you need. I believe it says something about this in 
> the libvorbisfile documentation. Something like this:
> 
> int left = 4096;
> while(left > 0)
> {
>     int data_read = vorbis_read(..., left);  // Can't remember the name 
> of the decode function.
>     // Do something with data, e.g. buffer it.
>     left -= data_read;
> }
> // Write buffer to stdout or similar. Unless there was an EOF, it should 
> be size 4096.
> 
> In the above code, special concern needs to be taken with regard to EOF.
> 

what about something like this

right where it says fwrite in the example decoder

if(left > 0){
                memcpy(tbuffer+(4096-left),convbuffer,bout*2*vi.channels);
left -= bout*2*vi.channels;

} else {
do my write function with the knowledge that i'm writing 4096 bytes
left = 4096;
}

can i really be sure that it wont try writing 1024 bytes one time and 
then 4096 the next?   and other combinations that overrun 4096?

<p><p><p>--- >8 ----
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