Module simd_manchester 

SIMD-accelerated Manchester encoding and decoding for LTC bitstreams.

Manchester coding maps each data bit to two half-bit audio periods:

• Bit 0: high half-period followed by low half-period
• Bit 1: low half-period followed by high half-period

The audio samples are i16: HIGH_LEVEL and LOW_LEVEL.

SIMD strategy

On x86_64 targets with the avx2 CPU feature available at runtime, manchester_encode_simd processes 32 input bytes (= 256 bits) per iteration using _mm256_movemask_epi8 to extract the sign bit of each byte, then expands each bit into two i16 samples. All other targets (and AVX2-capable targets without the feature at runtime) fall back to a pure scalar path that produces identical output.

Constants

HIGH_LEVEL

PCM level for the high half-period.

LOW_LEVEL

PCM level for the low half-period.

Functions

manchester_decode_scalar

Scalar Manchester decoding — reference implementation.

manchester_decode_simd

Decode Manchester-coded audio samples back to a bit stream.

manchester_encode_scalar

Scalar Manchester encoding — reference implementation.

manchester_encode_simd

Encode bits using Manchester coding, returning PCM audio samples.