1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <log/log.h>
18 #include "yuv.h"
19
20 namespace android {
21 namespace hardware {
22 namespace camera {
23 namespace provider {
24 namespace implementation {
25 namespace yuv {
26 namespace {
27
copyCbCrPlane(uint8_t * dst,const size_t width,size_t height,const void * src,const size_t srcStride,const size_t srcStep)28 void copyCbCrPlane(uint8_t* dst, const size_t width, size_t height,
29 const void* src, const size_t srcStride, const size_t srcStep) {
30 const uint8_t* src8 = static_cast<const uint8_t*>(src);
31 for (; height > 0; --height, src8 += srcStride) {
32 const uint8_t* p = src8;
33 for (size_t rem = width & 15; rem; --rem, ++dst, p += srcStep) {
34 *dst = *p;
35 }
36
37 for (size_t width16 = width >> 4; width16; --width16) {
38 *dst = *p; ++dst; p += srcStep;
39 *dst = *p; ++dst; p += srcStep;
40 *dst = *p; ++dst; p += srcStep;
41 *dst = *p; ++dst; p += srcStep;
42 *dst = *p; ++dst; p += srcStep;
43 *dst = *p; ++dst; p += srcStep;
44 *dst = *p; ++dst; p += srcStep;
45 *dst = *p; ++dst; p += srcStep;
46 *dst = *p; ++dst; p += srcStep;
47 *dst = *p; ++dst; p += srcStep;
48 *dst = *p; ++dst; p += srcStep;
49 *dst = *p; ++dst; p += srcStep;
50 *dst = *p; ++dst; p += srcStep;
51 *dst = *p; ++dst; p += srcStep;
52 *dst = *p; ++dst; p += srcStep;
53 *dst = *p; ++dst; p += srcStep;
54 }
55 }
56 }
57
58 } // namespace
59
NV21size(const size_t width,const size_t height)60 size_t NV21size(const size_t width, const size_t height) {
61 LOG_ALWAYS_FATAL_IF((width & 1) || (height & 1));
62 return width * height * 3 / 2;
63 }
64
NV21init(const size_t width,const size_t height,void * data)65 android_ycbcr NV21init(const size_t width, const size_t height, void* data) {
66 LOG_ALWAYS_FATAL_IF((width & 1) || (height & 1));
67 uint8_t* data8 = static_cast<uint8_t*>(data);
68 const size_t area = width * height;
69
70 android_ycbcr nv21;
71 nv21.y = data8;
72 nv21.cb = data8 + area;
73 nv21.cr = data8 + area + (area >> 2);
74 nv21.ystride = width;
75 nv21.cstride = width / 2;
76 nv21.chroma_step = 1;
77
78 return nv21;
79 }
80
toNV21Shallow(const size_t width,const size_t height,const android_ycbcr & ycbcr,std::vector<uint8_t> * data)81 android_ycbcr toNV21Shallow(const size_t width, const size_t height,
82 const android_ycbcr& ycbcr,
83 std::vector<uint8_t>* data) {
84 LOG_ALWAYS_FATAL_IF((width & 1) || (height & 1));
85 if (ycbcr.chroma_step == 1) {
86 return ycbcr;
87 }
88
89 const size_t area = width * height;
90 data->resize(area / 2); // only for CbCr
91
92 android_ycbcr nv21;
93 nv21.y = ycbcr.y; // don't copy Y
94 nv21.ystride = ycbcr.ystride;
95 nv21.cb = &data[0];
96 nv21.cr = &data[area / 4];
97 nv21.cstride = width / 2;
98 nv21.chroma_step = 1;
99
100 copyCbCrPlane(&((*data)[0]), width / 2, height / 2,
101 ycbcr.cb, ycbcr.cstride, ycbcr.chroma_step);
102 copyCbCrPlane(&((*data)[area / 4]), width / 2, height / 2,
103 ycbcr.cr, ycbcr.cstride, ycbcr.chroma_step);
104
105 return nv21;
106 }
107
108 } // namespace yuv
109 } // namespace implementation
110 } // namespace provider
111 } // namespace camera
112 } // namespace hardware
113 } // namespace android
114