Module simd 

SIMD abstraction layer for video codec implementations.

This module provides a unified interface for SIMD operations used in video encoding and decoding. It abstracts over different SIMD instruction sets (AVX2, AVX-512, NEON) while providing a scalar fallback for portability.

Architecture

The SIMD abstraction consists of:

• Types (types.rs): Vector types like I16x8, I32x4, U8x16
• Traits (traits.rs): SimdOps and SimdOpsExt for SIMD operations
• Architecture-specific: x86 (AVX2/AVX-512), ARM (NEON), scalar fallback
• Codec-specific: AV1 and VP9 optimized operations
• Operations: Domain-specific modules for codec operations

Usage

use oximedia_codec::simd::{detect_simd, select_transform_impl};

// Detect SIMD capabilities
let caps = detect_simd();
println!("Best SIMD: {}", caps.best_level());

// Use codec-specific SIMD operations
use oximedia_codec::simd::av1::TransformSimd;
let transform = TransformSimd::new(select_transform_impl());
transform.forward_dct_8x8(&input, &mut output);

Feature Detection and Dispatch

The SIMD implementation is selected at runtime based on CPU capabilities:

use oximedia_codec::simd::{SimdCapabilities, detect_simd};

let caps = detect_simd();
if caps.avx512 {
    // Use AVX-512 optimized path
} else if caps.avx2 {
    // Use AVX2 path
} else if caps.neon {
    // Use ARM NEON path
} else {
    // Use scalar fallback
}

Re-exports

pub use blend::blend_ops;

pub use blend::BlendOps;

pub use dct::dct_ops;

pub use dct::DctOps;

pub use filter::filter_ops;

pub use filter::FilterOps;

pub use sad::sad_ops;

pub use sad::SadOps;

pub use traits::SimdOps;

pub use traits::SimdOpsExt;

pub use traits::SimdSelector;

pub use types::I16x16;

pub use types::I16x8;

pub use types::I32x4;

pub use types::I32x8;

pub use types::U8x16;

pub use types::U8x32;

pub use arm::NeonSimd;

pub use scalar::ScalarFallback;

pub use x86::Avx2Simd;

pub use x86::Avx512Simd;

pub use av1::CdefSimd;

pub use av1::IntraPredSimd;

pub use av1::LoopFilterSimd;

pub use av1::MotionCompSimd;

pub use av1::TransformSimd;

pub use vp9::Vp9DctSimd;

pub use vp9::Vp9InterpolateSimd;

pub use vp9::Vp9IntraPredSimd;

pub use vp9::Vp9LoopFilterSimd;

Modules

arm

ARM NEON SIMD implementations.

av1

AV1-specific SIMD operations.

blend

Blending operations for video codec implementations.

dct

Discrete Cosine Transform (DCT) operations.

filter

Filter operations for video codec implementations.

pixel_convert

SIMD-accelerated pixel format conversion.

sad

Sum of Absolute Differences (SAD) operations.

scalar

Portable scalar fallback implementation.

traits

SIMD operation traits for video codec implementations.

types

Common SIMD types and type aliases.

vp9

VP9-specific SIMD operations.

x86

x86_64 SIMD implementations (AVX2 and AVX-512).

Structs

SimdCapabilities

CPU SIMD capabilities.

Enums

TransformImpl

Transform implementation selection.

Functions

detect_capabilitiesDeprecated

Legacy capabilities detection (deprecated, use detect_simd instead).

detect_simd

Detect CPU SIMD capabilities at runtime.

get_simd

Get the best SIMD implementation for the current CPU.

get_simd_ext

Get the best extended SIMD implementation for the current CPU.

scalar_simdDeprecated

Legacy scalar SIMD accessor (deprecated, use ScalarFallback directly).

select_transform_impl

Select the best transform implementation for the current CPU.