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feat(vm): add dbgain unit, where gain is defined in decibels

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Closes #78
This commit is contained in:
5684185+vsariola@users.noreply.github.com
2023-10-23 18:16:31 +03:00
parent f698986718
commit 04fbc9f6a7
12 changed files with 146 additions and 25 deletions
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20
vm/compiler/templates/wasm/effects.wat
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@ -98,6 +98,26 @@
)
{{end}}
{{- if .HasOp "dbgain"}}
;;-------------------------------------------------------------------------------
;; DBGAIN opcode: apply gain on the signal, with gain given in decibels
;;-------------------------------------------------------------------------------
;; Mono: x -> x*g, where g = 2**((2*d-1)*6.643856189774724) i.e. -40dB to 40dB, d=[0..1]
;; Stereo: l r -> l*g r*g
;;-------------------------------------------------------------------------------
(func $su_op_dbgain (param $stereo i32)
{{- if .Stereo "dbgain"}}
(call $stereoHelper (local.get $stereo) (i32.const {{div (.GetOp "dbgain") 2}}))
{{- end}}
(call $input (i32.const {{.InputNumber "dbgain" "decibels"}}))
(f32.sub (f32.const 0.5))
(f32.mul (f32.const 13.287712379549449))
(call $pow2)
(f32.mul (call $pop))
(call $push)
)
{{end}}
{{- if .HasOp "filter"}}
;;-------------------------------------------------------------------------------