1 /*
2 * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "api/video/nv12_buffer.h"
12
13 #include "api/make_ref_counted.h"
14 #include "api/video/i420_buffer.h"
15 #include "rtc_base/checks.h"
16 #include "third_party/libyuv/include/libyuv/convert.h"
17 #include "third_party/libyuv/include/libyuv/scale.h"
18
19 namespace webrtc {
20
21 namespace {
22
23 static const int kBufferAlignment = 64;
24
NV12DataSize(int height,int stride_y,int stride_uv)25 int NV12DataSize(int height, int stride_y, int stride_uv) {
26 return stride_y * height + stride_uv * ((height + 1) / 2);
27 }
28
29 } // namespace
30
NV12Buffer(int width,int height)31 NV12Buffer::NV12Buffer(int width, int height)
32 : NV12Buffer(width, height, width, width + width % 2) {}
33
NV12Buffer(int width,int height,int stride_y,int stride_uv)34 NV12Buffer::NV12Buffer(int width, int height, int stride_y, int stride_uv)
35 : width_(width),
36 height_(height),
37 stride_y_(stride_y),
38 stride_uv_(stride_uv),
39 data_(static_cast<uint8_t*>(
40 AlignedMalloc(NV12DataSize(height_, stride_y_, stride_uv),
41 kBufferAlignment))) {
42 RTC_DCHECK_GT(width, 0);
43 RTC_DCHECK_GT(height, 0);
44 RTC_DCHECK_GE(stride_y, width);
45 RTC_DCHECK_GE(stride_uv, (width + width % 2));
46 }
47
48 NV12Buffer::~NV12Buffer() = default;
49
50 // static
Create(int width,int height)51 rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width, int height) {
52 return rtc::make_ref_counted<NV12Buffer>(width, height);
53 }
54
55 // static
Create(int width,int height,int stride_y,int stride_uv)56 rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width,
57 int height,
58 int stride_y,
59 int stride_uv) {
60 return rtc::make_ref_counted<NV12Buffer>(width, height, stride_y, stride_uv);
61 }
62
63 // static
Copy(const I420BufferInterface & i420_buffer)64 rtc::scoped_refptr<NV12Buffer> NV12Buffer::Copy(
65 const I420BufferInterface& i420_buffer) {
66 rtc::scoped_refptr<NV12Buffer> buffer =
67 NV12Buffer::Create(i420_buffer.width(), i420_buffer.height());
68 libyuv::I420ToNV12(
69 i420_buffer.DataY(), i420_buffer.StrideY(), i420_buffer.DataU(),
70 i420_buffer.StrideU(), i420_buffer.DataV(), i420_buffer.StrideV(),
71 buffer->MutableDataY(), buffer->StrideY(), buffer->MutableDataUV(),
72 buffer->StrideUV(), buffer->width(), buffer->height());
73 return buffer;
74 }
75
ToI420()76 rtc::scoped_refptr<I420BufferInterface> NV12Buffer::ToI420() {
77 rtc::scoped_refptr<I420Buffer> i420_buffer =
78 I420Buffer::Create(width(), height());
79 libyuv::NV12ToI420(DataY(), StrideY(), DataUV(), StrideUV(),
80 i420_buffer->MutableDataY(), i420_buffer->StrideY(),
81 i420_buffer->MutableDataU(), i420_buffer->StrideU(),
82 i420_buffer->MutableDataV(), i420_buffer->StrideV(),
83 width(), height());
84 return i420_buffer;
85 }
86
width() const87 int NV12Buffer::width() const {
88 return width_;
89 }
height() const90 int NV12Buffer::height() const {
91 return height_;
92 }
93
StrideY() const94 int NV12Buffer::StrideY() const {
95 return stride_y_;
96 }
StrideUV() const97 int NV12Buffer::StrideUV() const {
98 return stride_uv_;
99 }
100
DataY() const101 const uint8_t* NV12Buffer::DataY() const {
102 return data_.get();
103 }
104
DataUV() const105 const uint8_t* NV12Buffer::DataUV() const {
106 return data_.get() + UVOffset();
107 }
108
MutableDataY()109 uint8_t* NV12Buffer::MutableDataY() {
110 return data_.get();
111 }
112
MutableDataUV()113 uint8_t* NV12Buffer::MutableDataUV() {
114 return data_.get() + UVOffset();
115 }
116
UVOffset() const117 size_t NV12Buffer::UVOffset() const {
118 return stride_y_ * height_;
119 }
120
InitializeData()121 void NV12Buffer::InitializeData() {
122 memset(data_.get(), 0, NV12DataSize(height_, stride_y_, stride_uv_));
123 }
124
CropAndScaleFrom(const NV12BufferInterface & src,int offset_x,int offset_y,int crop_width,int crop_height)125 void NV12Buffer::CropAndScaleFrom(const NV12BufferInterface& src,
126 int offset_x,
127 int offset_y,
128 int crop_width,
129 int crop_height) {
130 RTC_CHECK_LE(crop_width, src.width());
131 RTC_CHECK_LE(crop_height, src.height());
132 RTC_CHECK_LE(crop_width + offset_x, src.width());
133 RTC_CHECK_LE(crop_height + offset_y, src.height());
134 RTC_CHECK_GE(offset_x, 0);
135 RTC_CHECK_GE(offset_y, 0);
136
137 // Make sure offset is even so that u/v plane becomes aligned.
138 const int uv_offset_x = offset_x / 2;
139 const int uv_offset_y = offset_y / 2;
140 offset_x = uv_offset_x * 2;
141 offset_y = uv_offset_y * 2;
142
143 const uint8_t* y_plane = src.DataY() + src.StrideY() * offset_y + offset_x;
144 const uint8_t* uv_plane =
145 src.DataUV() + src.StrideUV() * uv_offset_y + uv_offset_x * 2;
146
147 int res = libyuv::NV12Scale(y_plane, src.StrideY(), uv_plane, src.StrideUV(),
148 crop_width, crop_height, MutableDataY(),
149 StrideY(), MutableDataUV(), StrideUV(), width(),
150 height(), libyuv::kFilterBox);
151
152 RTC_DCHECK_EQ(res, 0);
153 }
154
155 } // namespace webrtc
156