[Vorbis-dev] Getting samples in a packet without decoding

[xiphmont at xiph.org]

The first packet after any decode [re]start will not return samples.
It can't; the MDCT output it produces must be lapped with the output
of the following packet to produce finished samples.  This is why
granule position is 'the position one past the last sample produced
decoding a packet', essentially the sample past the middle of the
window.

Trimming only happens at the stream beginning/ending.

Monty