[Scummvm-tracker] [ScummVM :: Bugs] #16584: NANCY: nancy6+: Some sounds are too short

[ScummVM :: Bugs]

#16584: NANCY: nancy6+: Some sounds are too short
---------------------+----------------------------
Reporter:  flipkick  |       Owner:  flipkick
    Type:  defect    |      Status:  pending
Priority:  normal    |   Component:  Engine: Nancy
 Version:            |  Resolution:  pending
Keywords:            |        Game:
---------------------+----------------------------
Changes (by flipkick):

 * owner:  (none) => flipkick
 * resolution:   => pending
 * status:  new => pending

Comment:

 I figured out that the ScummVM vorbis path cuts off part of the sound at
 the beginning. The decoder uses libvorbis which decodes from the stream's
 PCM start position. For some reason the nancy vorbis format sometimes has
 a PCM start position not at the beginning of the file. vorbis spec allows
 this. So, the decoder plays the sound starting from there and not from the
 actual beginning of the raw audio data. I analyzed the original nancy
 Game.exe code on how it handles the HIS files which contain the vorbis
 audio. It actually completely ignores the PCM data and always reads the
 audio data from raw position 0. That's why the ScummVM decoder cuts off a
 part of the beginning of many samples.
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Ticket URL: <https://bugs.scummvm.org/ticket/16584#comment:1>
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