rockbox/lib/rbcodec/dsp/surround.c, branch wolf3d

PBE+Surround: Localize some variables and fixup some flush ops

2017-10-12T09:59:18+00:00

Change-Id: I9fba5b8cbf69d261a7ca1c66e080c08d2fc6d9db

Nitpick configuration code in a few DSP filters to fix some bugs

2017-10-12T08:44:55+00:00

Most importantly is surround shouldn't operate in mono mode. Have it
watch and (de)activate itself on relevant format changes as it should.

Other changes to better handle buffer allocation failure.

PBE was set internally at 100 by default; SBZ.

Change-Id: I328e0b674e56751a255eae817d7892d685796b06

fix surround & pbe dsp crash

2015-01-30T19:06:00+00:00

check handle before clean up buffer in flush().

Change-Id: I36a130c45c9f5dce97aa723ef98922b6935ead75

fix pbe/haas surround dsps: surround_enabled, redo flush functions.

2015-01-22T02:28:34+00:00

surround_enabled was never true, end up dsp_surround_flush didn't work; Thats why a cracking noise occurs in right channel when moving track positions.

redo pbe/surround flush in a much simpler way suits the current single buffer style.

Change-Id: I394054ddfb164b82c90b3dcf49df4442db87d8d2

three new DSPs

2015-01-19T18:34:01+00:00

perceptual bass enhancement
- a bbe-ish group delay corrction with Biophonic EQ boost.
- precut

auditory fatigue reduction
-reduce signal in frequency that may trigger temporary threshold shift

haas surround
-frequency between f(x1) and f(x2) is always bypassed.
-can apply to side only.

Change-Id: Icb6355ce9b1c99bf2c58c9385c3c411c0ae209d3