av-scenechange 0.19.1

Estimates frames in a video where a scenecut would be ideal
Documentation 
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use cfg_if::cfg_if;
use v_frame::{pixel::Pixel, plane::Plane};

use crate::data::{
    plane::{Area, AsRegion},
    sad::get_sad,
};

// Generate plane data for get_sad tests
fn setup_planes<T: Pixel>() -> (Plane<T>, Plane<T>) {
    // Two planes with different strides
    let mut input_plane = Plane::new(640, 480, 0, 0, 128 + 8, 128 + 8);
    let mut rec_plane = Plane::new(640, 480, 0, 0, 2 * 128 + 8, 2 * 128 + 8);

    // Make the test pattern robust to data alignment
    let xpad_off = (input_plane.cfg.xorigin - input_plane.cfg.xpad) as i32 - 8i32;

    for (i, row) in input_plane
        .data
        .chunks_mut(input_plane.cfg.stride)
        .enumerate()
    {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = ((j + i) as i32 - xpad_off) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    for (i, row) in rec_plane.data.chunks_mut(rec_plane.cfg.stride).enumerate() {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = (j as i32 - i as i32 - xpad_off) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    (input_plane, rec_plane)
}

// Generate plane data for sad_plane_internal tests
fn setup_equal_stride_planes<T: Pixel>() -> (Plane<T>, Plane<T>) {
    // Two planes with same stride for sad_plane_internal testing
    let mut input_plane = Plane::new(320, 240, 0, 0, 0, 0);
    let mut rec_plane = Plane::new(320, 240, 0, 0, 0, 0);

    for (i, row) in input_plane
        .data
        .chunks_mut(input_plane.cfg.stride)
        .enumerate()
    {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = ((j + i) as i32) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    for (i, row) in rec_plane.data.chunks_mut(rec_plane.cfg.stride).enumerate() {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = (j as i32 - i as i32) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    (input_plane, rec_plane)
}

fn sad_plane_verify_asm<T: Pixel>(src: &Plane<T>, dst: &Plane<T>) -> u64 {
    let rust_output = super::rust::sad_plane_internal(src, dst);

    cfg_if! {
        if #[cfg(asm_x86_64)] {
            if crate::cpu::has_avx2() {
                let asm_output = unsafe { super::avx2::sad_plane_internal(src, dst) };
                assert_eq!(rust_output, asm_output);
            }
            // All x86_64 CPUs have SSE2
            let asm_output = unsafe { super::sse2::sad_plane_internal(src, dst) };
            assert_eq!(rust_output, asm_output);
        }
    }

    rust_output
}

fn get_sad_same_inner<T: Pixel>() {
    let blocks: Vec<(usize, usize, u32)> = vec![
        (4, 4, 1912),
        (4, 8, 4296),
        (8, 4, 3496),
        (8, 8, 7824),
        (8, 16, 16592),
        (16, 8, 14416),
        (16, 16, 31136),
        (16, 32, 60064),
        (32, 16, 59552),
        (32, 32, 120128),
        (32, 64, 186688),
        (64, 32, 250176),
        (64, 64, 438912),
        (64, 128, 654272),
        (128, 64, 1016768),
        (128, 128, 1689792),
        (4, 16, 8680),
        (16, 4, 6664),
        (8, 32, 31056),
        (32, 8, 27600),
        (16, 64, 93344),
        (64, 16, 116384),
    ];

    let bit_depth: usize = 8;
    let (input_plane, rec_plane) = setup_planes::<T>();

    for (w, h, distortion) in blocks {
        let area = Area::StartingAt { x: 32, y: 40 };

        let input_region = input_plane.region(area);
        let rec_region = rec_plane.region(area);

        assert_eq!(
            distortion,
            get_sad(&input_region, &rec_region, w, h, bit_depth)
        );
    }
}

fn sad_plane_same_inner<T: Pixel>() {
    let (input_plane, rec_plane) = setup_equal_stride_planes::<T>();

    // Test with the full planes
    let _sad_value = sad_plane_verify_asm(&input_plane, &rec_plane);

    // Test with smaller planes to ensure the algorithm works correctly
    let mut small_input = Plane::new(16, 16, 0, 0, 0, 0);
    let mut small_rec = Plane::new(16, 16, 0, 0, 0, 0);

    // Initialize the small planes with test data
    for (i, row) in small_input
        .data
        .chunks_mut(small_input.cfg.stride)
        .enumerate()
    {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = ((j + i) as i32) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    for (i, row) in small_rec.data.chunks_mut(small_rec.cfg.stride).enumerate() {
        for (j, pixel) in row.iter_mut().enumerate() {
            let val = (j as i32 - i as i32) & 255i32;
            assert!(val >= u8::MIN.into() && val <= u8::MAX.into());
            *pixel = T::cast_from(val);
        }
    }

    let _small_sad = sad_plane_verify_asm(&small_input, &small_rec);
}

#[test]
fn get_sad_same_u8() {
    get_sad_same_inner::<u8>();
}

#[test]
fn get_sad_same_u16() {
    get_sad_same_inner::<u16>();
}

#[test]
fn sad_plane_same_u8() {
    sad_plane_same_inner::<u8>();
}

#[test]
fn sad_plane_same_u16() {
    sad_plane_same_inner::<u16>();
}