Module mixer 

Fixed-point 16.16 audio mixer

Provides software audio mixing using integer-only arithmetic suitable for kernel context where FPU state is not available. All volume and sample calculations use 16.16 fixed-point representation.

Fixed-Point Format

A FixedPoint value (i32) stores a number with 16 integer bits and 16 fractional bits. For example:

• 0x0001_0000 = 1.0
• 0x0000_8000 = 0.5
• 0x0000_0000 = 0.0
• 0xFFFF_0000 = -1.0

Structs

AudioMixer

Multi-channel audio mixer with fixed-point arithmetic

MixerChannel

A single mixer channel representing one audio source

Functions

fp_from_i16

Convert a signed 16-bit sample to fixed-point 16.16

fp_from_volume

Convert a volume value (0..65535) to fixed-point (0.0..1.0)

fp_mul

Multiply two fixed-point values with saturation

fp_to_i16

Convert a fixed-point 16.16 value back to signed 16-bit with saturation

init

Initialize the global audio mixer

with_mixer

Access the global mixer through a closure

Type Aliases

FixedPoint

Fixed-point 16.16 type: 16 integer bits + 16 fractional bits