[Flac-dev] Decoding without read callbacks.

[Josh Coalson]

--- illiminable <ogg at illiminable.com> wrote:
> Thanks for the reply,
> 
> But that still tries to read for itself from libogg... i need to be
> able to
> feed data only... it can never try and read for itself. That code is
> still
> trying to control the data flow. Basicly i need to operate like this.
> 
> SetupCodec
> 
> when i have data to give to the codec
>    FeedDataToCodec(data)
>    //Receive a bunch of callbacks somewhere returning me pcm data
>    //Codec waits for more data and doesn't reset itself.
> 
> I will always give it a complete ogg packet as a buffer (but not in
> an
> oggpacket struct because directshow uses a different sample
> structure.) and
> size. And i need it to process the data i give it and then wait until
> i give
> it some more. There is no way the codec can read data unless i give
> it to
> it.

assuming you can get whole ogg packets, it should work.  let's
say the flow is X -> C -> Y (X feeds Ogg FLAC to codec C which
feeds PCM to Y):

- X feeds data to C until C gets one Ogg FLAC packet.
- C puts packet in global buffer B.
- C calls FLAC__*_process_single()
- FLAC__*_process_single() calls C's read_callback()
- read_callback returns B
- FLAC decodes B, calls C's write_callback with PCM data P
  corresponding to the decoded samples from B
- C writes P to Y

Josh


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