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/*
* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "api/video/nv12_buffer.h"
#include "api/make_ref_counted.h"
#include "api/video/i420_buffer.h"
#include "rtc_base/checks.h"
#include "third_party/libyuv/include/libyuv/convert.h"
#include "third_party/libyuv/include/libyuv/scale.h"
namespace webrtc {
namespace {
static const int kBufferAlignment = 64;
int NV12DataSize(int height, int stride_y, int stride_uv) {
return stride_y * height + stride_uv * ((height + 1) / 2);
}
} // namespace
NV12Buffer::NV12Buffer(int width, int height)
: NV12Buffer(width, height, width, width + width % 2) {}
NV12Buffer::NV12Buffer(int width, int height, int stride_y, int stride_uv)
: width_(width),
height_(height),
stride_y_(stride_y),
stride_uv_(stride_uv),
data_(static_cast<uint8_t*>(
AlignedMalloc(NV12DataSize(height_, stride_y_, stride_uv),
kBufferAlignment))) {
RTC_DCHECK_GT(width, 0);
RTC_DCHECK_GT(height, 0);
RTC_DCHECK_GE(stride_y, width);
RTC_DCHECK_GE(stride_uv, (width + width % 2));
}
NV12Buffer::~NV12Buffer() = default;
// static
rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width, int height) {
return rtc::make_ref_counted<NV12Buffer>(width, height);
}
// static
rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width,
int height,
int stride_y,
int stride_uv) {
return rtc::make_ref_counted<NV12Buffer>(width, height, stride_y, stride_uv);
}
// static
rtc::scoped_refptr<NV12Buffer> NV12Buffer::Copy(
const I420BufferInterface& i420_buffer) {
rtc::scoped_refptr<NV12Buffer> buffer =
NV12Buffer::Create(i420_buffer.width(), i420_buffer.height());
libyuv::I420ToNV12(
i420_buffer.DataY(), i420_buffer.StrideY(), i420_buffer.DataU(),
i420_buffer.StrideU(), i420_buffer.DataV(), i420_buffer.StrideV(),
buffer->MutableDataY(), buffer->StrideY(), buffer->MutableDataUV(),
buffer->StrideUV(), buffer->width(), buffer->height());
return buffer;
}
rtc::scoped_refptr<I420BufferInterface> NV12Buffer::ToI420() {
rtc::scoped_refptr<I420Buffer> i420_buffer =
I420Buffer::Create(width(), height());
libyuv::NV12ToI420(DataY(), StrideY(), DataUV(), StrideUV(),
i420_buffer->MutableDataY(), i420_buffer->StrideY(),
i420_buffer->MutableDataU(), i420_buffer->StrideU(),
i420_buffer->MutableDataV(), i420_buffer->StrideV(),
width(), height());
return i420_buffer;
}
int NV12Buffer::width() const {
return width_;
}
int NV12Buffer::height() const {
return height_;
}
int NV12Buffer::StrideY() const {
return stride_y_;
}
int NV12Buffer::StrideUV() const {
return stride_uv_;
}
const uint8_t* NV12Buffer::DataY() const {
return data_.get();
}
const uint8_t* NV12Buffer::DataUV() const {
return data_.get() + UVOffset();
}
uint8_t* NV12Buffer::MutableDataY() {
return data_.get();
}
uint8_t* NV12Buffer::MutableDataUV() {
return data_.get() + UVOffset();
}
size_t NV12Buffer::UVOffset() const {
return stride_y_ * height_;
}
void NV12Buffer::InitializeData() {
memset(data_.get(), 0, NV12DataSize(height_, stride_y_, stride_uv_));
}
void NV12Buffer::CropAndScaleFrom(const NV12BufferInterface& src,
int offset_x,
int offset_y,
int crop_width,
int crop_height) {
RTC_CHECK_LE(crop_width, src.width());
RTC_CHECK_LE(crop_height, src.height());
RTC_CHECK_LE(crop_width + offset_x, src.width());
RTC_CHECK_LE(crop_height + offset_y, src.height());
RTC_CHECK_GE(offset_x, 0);
RTC_CHECK_GE(offset_y, 0);
// Make sure offset is even so that u/v plane becomes aligned.
const int uv_offset_x = offset_x / 2;
const int uv_offset_y = offset_y / 2;
offset_x = uv_offset_x * 2;
offset_y = uv_offset_y * 2;
const uint8_t* y_plane = src.DataY() + src.StrideY() * offset_y + offset_x;
const uint8_t* uv_plane =
src.DataUV() + src.StrideUV() * uv_offset_y + uv_offset_x * 2;
int res = libyuv::NV12Scale(y_plane, src.StrideY(), uv_plane, src.StrideUV(),
crop_width, crop_height, MutableDataY(),
StrideY(), MutableDataUV(), StrideUV(), width(),
height(), libyuv::kFilterBox);
RTC_DCHECK_EQ(res, 0);
}
} // namespace webrtc
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