yuv 0.8.13

High performance utilities for YUV format handling and conversion.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

/*
 * Copyright (c) Radzivon Bartoshyk, 10/2024. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1.  Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2.  Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3.  Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

use crate::internals::ProcessedOffset;
use crate::neon::utils::{neon_store_half_rgb8, vld_s16_endian, vldq_s16_endian, vpackq_n_shift16};
use crate::yuv_support::{
    CbCrInverseTransform, YuvChromaRange, YuvChromaSubsampling, YuvSourceChannels,
};
use std::arch::aarch64::*;

pub(crate) unsafe fn neon_yuv_p16_to_rgba_row<
    const DESTINATION_CHANNELS: u8,
    const SAMPLING: u8,
    const ENDIANNESS: u8,
    const BYTES_POSITION: u8,
    const BIT_DEPTH: usize,
    const PRECISION: i32,
>(
    y_ld_ptr: &[u16],
    u_ld_ptr: &[u16],
    v_ld_ptr: &[u16],
    rgba: &mut [u8],
    dst_offset: usize,
    width: u32,
    range: &YuvChromaRange,
    transform: &CbCrInverseTransform<i32>,
    start_cx: usize,
    start_ux: usize,
) -> ProcessedOffset {
    let destination_channels: YuvSourceChannels = DESTINATION_CHANNELS.into();
    let channels = destination_channels.get_channels_count();
    let chroma_subsampling: YuvChromaSubsampling = SAMPLING.into();
    let dst_ptr = rgba.as_mut_ptr();

    let y_corr = vdupq_n_u16(range.bias_y as u16);
    let uv_corr = vdupq_n_s16(range.bias_uv as i16);

    let weights_arr: [i16; 8] = [
        transform.y_coef as i16,
        transform.cr_coef as i16,
        transform.cb_coef as i16,
        -transform.g_coeff_1 as i16,
        -transform.g_coeff_2 as i16,
        0,
        0,
        0,
    ];

    let v_weights = vld1q_s16(weights_arr.as_ptr());

    let v_alpha = vdup_n_u8(255u8);

    let mut cx = start_cx;
    let mut ux = start_ux;

    while cx + 8 <= width as usize {
        let y_values: int16x8_t = vreinterpretq_s16_u16(vqsubq_u16(
            vreinterpretq_u16_s16(vldq_s16_endian::<ENDIANNESS, BYTES_POSITION, BIT_DEPTH>(
                y_ld_ptr.get_unchecked(cx..).as_ptr(),
            )),
            y_corr,
        ));

        let u_high: int16x4_t;
        let v_high: int16x4_t;
        let u_low: int16x4_t;
        let v_low: int16x4_t;

        if chroma_subsampling == YuvChromaSubsampling::Yuv444 {
            let mut u_values_l = vldq_s16_endian::<ENDIANNESS, BYTES_POSITION, BIT_DEPTH>(
                u_ld_ptr.get_unchecked(ux..).as_ptr(),
            );
            let mut v_values_l = vldq_s16_endian::<ENDIANNESS, BYTES_POSITION, BIT_DEPTH>(
                v_ld_ptr.get_unchecked(ux..).as_ptr(),
            );

            u_values_l = vsubq_s16(u_values_l, uv_corr);
            v_values_l = vsubq_s16(v_values_l, uv_corr);

            u_high = vget_high_s16(u_values_l);
            u_low = vget_low_s16(u_values_l);
            v_high = vget_high_s16(v_values_l);
            v_low = vget_low_s16(v_values_l);
        } else {
            let mut u_values_l = vld_s16_endian::<ENDIANNESS, BYTES_POSITION, BIT_DEPTH>(
                u_ld_ptr.get_unchecked(ux..).as_ptr(),
            );
            let mut v_values_l = vld_s16_endian::<ENDIANNESS, BYTES_POSITION, BIT_DEPTH>(
                v_ld_ptr.get_unchecked(ux..).as_ptr(),
            );
            u_values_l = vsub_s16(u_values_l, vget_low_s16(uv_corr));
            v_values_l = vsub_s16(v_values_l, vget_low_s16(uv_corr));

            u_high = vzip2_s16(u_values_l, u_values_l);
            v_high = vzip2_s16(v_values_l, v_values_l);

            u_low = vzip1_s16(u_values_l, u_values_l);
            v_low = vzip1_s16(v_values_l, v_values_l);
        }

        let y_high = vmull_high_laneq_s16::<0>(y_values, v_weights);
        let y_low = vmull_laneq_s16::<0>(vget_low_s16(y_values), v_weights);

        let rh0 = vmlal_laneq_s16::<1>(y_high, v_high, v_weights);
        let bh0 = vmlal_laneq_s16::<2>(y_high, u_high, v_weights);
        let gh0 = vmlal_laneq_s16::<3>(y_high, v_high, v_weights);
        let rl0 = vmlal_laneq_s16::<1>(y_low, v_low, v_weights);
        let bl0 = vmlal_laneq_s16::<2>(y_low, u_low, v_weights);
        let gl0 = vmlal_laneq_s16::<3>(y_low, v_low, v_weights);

        let r_high = vqrshrun_n_s32::<PRECISION>(rh0);
        let b_high = vqrshrun_n_s32::<PRECISION>(bh0);
        let g_high = vqrshrun_n_s32::<PRECISION>(vmlal_laneq_s16::<4>(gh0, u_high, v_weights));

        let r_low = vqrshrun_n_s32::<PRECISION>(rl0);
        let b_low = vqrshrun_n_s32::<PRECISION>(bl0);
        let g_low = vqrshrun_n_s32::<PRECISION>(vmlal_laneq_s16::<4>(gl0, u_low, v_weights));

        let r_values = vpackq_n_shift16::<BIT_DEPTH>(vcombine_u16(r_low, r_high));
        let g_values = vpackq_n_shift16::<BIT_DEPTH>(vcombine_u16(g_low, g_high));
        let b_values = vpackq_n_shift16::<BIT_DEPTH>(vcombine_u16(b_low, b_high));

        neon_store_half_rgb8::<DESTINATION_CHANNELS>(
            dst_ptr.add(dst_offset + cx * channels),
            r_values,
            g_values,
            b_values,
            v_alpha,
        );

        cx += 8;

        match chroma_subsampling {
            YuvChromaSubsampling::Yuv420 | YuvChromaSubsampling::Yuv422 => {
                ux += 4;
            }
            YuvChromaSubsampling::Yuv444 => {
                ux += 8;
            }
        }
    }

    ProcessedOffset { cx, ux }
}