[DVDnav-discuss] Extended API

[Jorgen Lundman]

As a first time developer using libdvdnav, it is quite straight forward 
to work with, and hides most of the magic required to read DVDs. It is 
quite straight forward to enumerate the audio streams, and SPU sub 
channels. Pick the title I want to "play", ie; receive data for and start.

But I feel the API is a bit lacking.

It seems to always send me the full-stream when I play,for example, 
title 2. This forces me to delve rather deep into MPEG specifics after all.

I expected to find API calls to be able to do this:

   dvdnav_title_play(dvdnav, 2);       // play title 2
+ dvdnav_set_audio_stream(dvdnav, 3); // select audio stream 3
+ dvdnav_set_spu_stream(dvdnav, 1);   // pick subs stream 1

while(dvdnav_get_next_cache_block)
  {
case DVDNAV_BLOCK_OK:
     // we got blocks related to title 1, audio 3 and spu 1.


I can understand most software using libdvdnav already have MPG demuxers 
so it makes little difference, most of them seems to have been forced to 
add demux code anyway. It really would have been nice if libdvdnav went 
the whole way. :) It didn't say I was shopping at IKEA...

Anyway, anyone have a nice example to pull out only the video, audio and 
spu stream that I want? It seems I have lots to learn about MPEG packets.

Lund

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