[Vorbis-dev] Patches for advanced encode option to change impulse

[Stephen So]

triggers
Message-ID: <410085E5.20601 at griffith.edu.au>

Hi everyone,

I've added a new advanced-encode-option that allows the user to change
the global mapping value for the particular quality value they encode
at.  The option is called "impulse_trigger_profile" and can take on
values of 0 to 6, where 0 to 4 are the default _psy_global_44 values
while 5 and 6 are basically 3 and 4 from GT3b1.  Basically using a
higher number makes Vorbis switch to short blocks more often in order to
reduce a smearing noise that occurs at mid q on microattack samples like
the Originalsmall.flac sample at HA.org.  Vorbis isn't switching to
short blocks enough on these samples so 'upping' the global mapping
helps reduce it. :)

Best regards,

Steve
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