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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#pragma once
#include <vector>
#include <kms++/framebuffer.h>
#include <kms++util/color16.h>
#include "conv-common.h"
namespace kms
{
/* Semiplanar YUV */
template<ComponentType C0, ComponentType C1, size_t HSub, size_t VSub>
struct NV12_Family_Layout
: public FormatLayout<
PlaneLayout<uint8_t,
ComponentLayout<ComponentType::Y, 8, 0>
>,
PlaneLayout<uint16_t,
ComponentLayout<C0, 8, 0>,
ComponentLayout<C1, 8, 8>
>
>
{
static constexpr size_t h_sub = HSub;
static constexpr size_t v_sub = VSub;
};
using NV12_Layout = NV12_Family_Layout<ComponentType::Cb, ComponentType::Cr, 2, 2>;
using NV21_Layout = NV12_Family_Layout<ComponentType::Cr, ComponentType::Cb, 2, 2>;
using NV16_Layout = NV12_Family_Layout<ComponentType::Cb, ComponentType::Cr, 2, 1>;
using NV61_Layout = NV12_Family_Layout<ComponentType::Cr, ComponentType::Cb, 2, 1>;
template<size_t HSub, size_t VSub>
struct P030_Family_Layout
: public FormatLayout<
PlaneLayout<uint32_t,
ComponentLayout<ComponentType::Y, 10, 0>,
ComponentLayout<ComponentType::Y, 10, 10>,
ComponentLayout<ComponentType::Y, 10, 20>
>,
PlaneLayout<uint64_t,
ComponentLayout<ComponentType::Cb, 10, 0>,
ComponentLayout<ComponentType::Cr, 10, 10>,
ComponentLayout<ComponentType::Cb, 10, 20>,
ComponentLayout<ComponentType::Cr, 10, 32>,
ComponentLayout<ComponentType::Cb, 10, 42>,
ComponentLayout<ComponentType::Cr, 10, 52>
>
>
{
static constexpr size_t h_sub = HSub;
static constexpr size_t v_sub = VSub;
};
using P030_Layout = P030_Family_Layout<2, 2>;
using P230_Layout = P030_Family_Layout<2, 1>;
template<size_t HSub, size_t VSub>
struct SubsampleHelper {
template<typename View> static constexpr auto subsample(const View& view, size_t group_idx)
{
uint32_t sum = 0;
static_for<0, HSub>([&](auto x) { sum += view(0, group_idx + x); });
if constexpr (VSub > 1) {
static_for<1, VSub>([&](auto y) {
static_for<0, HSub>([&](auto x) { sum += view(y, group_idx + x); });
});
}
return sum / (HSub * VSub);
}
};
template<typename Layout>
class YUVSemiPlanarWriter
{
static_assert(Layout::num_planes == 2);
static constexpr size_t h_sub = Layout::h_sub;
static constexpr size_t v_sub = Layout::v_sub;
using YLayout = typename Layout::template plane<0>;
using UVLayout = typename Layout::template plane<1>;
using TY = typename YLayout::storage_type;
using TCrCb = typename UVLayout::storage_type;
static constexpr size_t pixels_in_group = YLayout::template component_count<ComponentType::Y>();
static_assert(pixels_in_group == UVLayout::template component_count<ComponentType::Cb>());
static_assert(pixels_in_group == UVLayout::template component_count<ComponentType::Cr>());
public:
static void write_pattern(IFramebuffer& fb, size_t start_y, size_t end_y,
auto&& generate_line)
{
assert(start_y % v_sub == 0);
assert((end_y + 1) % v_sub == 0);
if (fb.width() % pixels_in_group != 0)
throw std::invalid_argument("FB width doesn't align to pixel format");
// Line buffers
std::vector<YUV16> linebuf_storage(fb.width() * v_sub);
auto linebuf = md::mdspan(linebuf_storage.data(), v_sub, fb.width());
// Views to the planes
auto y_view = make_strided_fb_view<TY>(fb.map(0), fb.height(),
fb.width() / pixels_in_group, fb.stride(0));
auto uv_view = make_strided_fb_view<TCrCb>(fb.map(1), fb.height() / v_sub,
fb.width() / pixels_in_group / h_sub,
fb.stride(1));
for (size_t y_src = start_y; y_src <= end_y; y_src++) {
size_t y_offset = y_src % v_sub;
if (y_offset == 0) {
// Fill line buffers
for (size_t y_off = 0; y_off < v_sub; y_off++) {
auto line = md::submdspan(linebuf, y_off, md::full_extent);
std::span<YUV16> span(line.data_handle(), line.size());
generate_line(y_src + y_off, span);
}
}
// Write Y values from the line buffer
write_y_samples(md::submdspan(y_view, y_src, md::full_extent),
md::submdspan(linebuf, y_offset, md::full_extent));
if (y_offset == 0) {
// Write UV values from the line buffers
write_uv_samples(uv_view, linebuf, y_src);
}
}
}
private:
template<typename YBuf>
static void write_y_samples(YBuf&& y_view, auto&& linebuf)
{
for (size_t x_src = 0; x_src < linebuf.extent(1); x_src += pixels_in_group) {
auto x_dst = x_src / pixels_in_group;
write_y_group(y_view, linebuf, x_src, x_dst,
std::make_index_sequence<pixels_in_group>{});
}
}
template<typename YBuf, size_t... I>
static void write_y_group(YBuf&& y_view, auto&& linebuf, size_t x_src,
size_t x_dst, std::index_sequence<I...>)
{
std::array<component_storage_type, YLayout::num_components> y_values{
static_cast<component_storage_type>((linebuf(x_src + I).y >> (16 - YLayout::template component_size<I>)))...
};
y_view(x_dst) = YLayout::pack(y_values);
}
template<typename UVBuf>
static void write_uv_samples(UVBuf& uv_view, auto& linebuf, size_t y_src)
{
for (size_t x_src = 0; x_src < linebuf.extent(1); x_src += pixels_in_group * h_sub) {
const size_t y_offset = 0;
auto y_dst = (y_src + y_offset) / v_sub;
auto x_dst = x_src / (pixels_in_group * h_sub);
auto group_view = md::submdspan(linebuf, std::tuple(y_offset, y_offset + v_sub),
std::tuple(x_src, x_src + h_sub * pixels_in_group));
write_uv_group(uv_view, group_view, y_dst, x_dst,
std::make_index_sequence<pixels_in_group>{});
}
}
template<typename UVBuf, size_t... I>
static void write_uv_group(UVBuf& uv_view, auto& group_view, size_t y_dst, size_t x_dst,
std::index_sequence<I...>)
{
std::array<component_storage_type, UVLayout::num_components> uv_values;
(
[&]<size_t i>() {
constexpr size_t group_idx = i * h_sub;
constexpr size_t u_idx = UVLayout::template find_nth_pos<ComponentType::Cb>(i);
constexpr size_t v_idx = UVLayout::template find_nth_pos<ComponentType::Cr>(i);
auto u = SubsampleHelper<h_sub, v_sub>::subsample(
[&group_view](size_t y, size_t x) { return group_view(y, x).u; },
group_idx);
auto v = SubsampleHelper<h_sub, v_sub>::subsample(
[&group_view](size_t y, size_t x) { return group_view(y, x).v; },
group_idx);
uv_values[u_idx] =
u >> (16 - UVLayout::template component_size<u_idx>);
uv_values[v_idx] =
v >> (16 - UVLayout::template component_size<v_idx>);
}.template operator()<I>(),
...);
uv_view(y_dst, x_dst) = UVLayout::pack(uv_values);
}
};
} // namespace kms
|
