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/*
* Copyright (c) 2015 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/i420_buffer.h"
#include <string.h>
#include <algorithm>
#include <cstdint>
#include <utility>
#include "api/make_ref_counted.h"
#include "api/scoped_refptr.h"
#include "api/video/video_frame_buffer.h"
#include "api/video/video_rotation.h"
#include "rtc_base/checks.h"
#include "rtc_base/memory/aligned_malloc.h"
#include "third_party/libyuv/include/libyuv/convert.h"
#include "third_party/libyuv/include/libyuv/planar_functions.h"
#include "third_party/libyuv/include/libyuv/rotate.h"
#include "third_party/libyuv/include/libyuv/scale.h"
// Aligning pointer to 64 bytes for improved performance, e.g. use SIMD.
static const int kBufferAlignment = 64;
namespace webrtc {
namespace {
int I420DataSize(int height, int stride_y, int stride_u, int stride_v) {
return stride_y * height + (stride_u + stride_v) * ((height + 1) / 2);
}
} // namespace
I420Buffer::I420Buffer(int width, int height)
: I420Buffer(width, height, width, (width + 1) / 2, (width + 1) / 2) {}
I420Buffer::I420Buffer(int width,
int height,
int stride_y,
int stride_u,
int stride_v)
: width_(width),
height_(height),
stride_y_(stride_y),
stride_u_(stride_u),
stride_v_(stride_v),
data_(static_cast<uint8_t*>(
AlignedMalloc(I420DataSize(height, stride_y, stride_u, stride_v),
kBufferAlignment))) {
RTC_DCHECK_GT(width, 0);
RTC_DCHECK_GT(height, 0);
RTC_DCHECK_GE(stride_y, width);
RTC_DCHECK_GE(stride_u, (width + 1) / 2);
RTC_DCHECK_GE(stride_v, (width + 1) / 2);
}
I420Buffer::~I420Buffer() {}
// static
rtc::scoped_refptr<I420Buffer> I420Buffer::Create(int width, int height) {
return rtc::make_ref_counted<I420Buffer>(width, height);
}
// static
rtc::scoped_refptr<I420Buffer> I420Buffer::Create(int width,
int height,
int stride_y,
int stride_u,
int stride_v) {
return rtc::make_ref_counted<I420Buffer>(width, height, stride_y, stride_u,
stride_v);
}
// static
rtc::scoped_refptr<I420Buffer> I420Buffer::Copy(
const I420BufferInterface& source) {
return Copy(source.width(), source.height(), source.DataY(), source.StrideY(),
source.DataU(), source.StrideU(), source.DataV(),
source.StrideV());
}
// static
rtc::scoped_refptr<I420Buffer> I420Buffer::Copy(int width,
int height,
const uint8_t* data_y,
int stride_y,
const uint8_t* data_u,
int stride_u,
const uint8_t* data_v,
int stride_v) {
// Note: May use different strides than the input data.
rtc::scoped_refptr<I420Buffer> buffer = Create(width, height);
RTC_CHECK_EQ(0, libyuv::I420Copy(data_y, stride_y, data_u, stride_u, data_v,
stride_v, buffer->MutableDataY(),
buffer->StrideY(), buffer->MutableDataU(),
buffer->StrideU(), buffer->MutableDataV(),
buffer->StrideV(), width, height));
return buffer;
}
// static
rtc::scoped_refptr<I420Buffer> I420Buffer::Rotate(
const I420BufferInterface& src,
VideoRotation rotation) {
RTC_CHECK(src.DataY());
RTC_CHECK(src.DataU());
RTC_CHECK(src.DataV());
int rotated_width = src.width();
int rotated_height = src.height();
if (rotation == webrtc::kVideoRotation_90 ||
rotation == webrtc::kVideoRotation_270) {
std::swap(rotated_width, rotated_height);
}
rtc::scoped_refptr<webrtc::I420Buffer> buffer =
I420Buffer::Create(rotated_width, rotated_height);
RTC_CHECK_EQ(0,
libyuv::I420Rotate(
src.DataY(), src.StrideY(), src.DataU(), src.StrideU(),
src.DataV(), src.StrideV(), buffer->MutableDataY(),
buffer->StrideY(), buffer->MutableDataU(), buffer->StrideU(),
buffer->MutableDataV(), buffer->StrideV(), src.width(),
src.height(), static_cast<libyuv::RotationMode>(rotation)));
return buffer;
}
void I420Buffer::InitializeData() {
memset(data_.get(), 0,
I420DataSize(height_, stride_y_, stride_u_, stride_v_));
}
int I420Buffer::width() const {
return width_;
}
int I420Buffer::height() const {
return height_;
}
const uint8_t* I420Buffer::DataY() const {
return data_.get();
}
const uint8_t* I420Buffer::DataU() const {
return data_.get() + stride_y_ * height_;
}
const uint8_t* I420Buffer::DataV() const {
return data_.get() + stride_y_ * height_ + stride_u_ * ((height_ + 1) / 2);
}
int I420Buffer::StrideY() const {
return stride_y_;
}
int I420Buffer::StrideU() const {
return stride_u_;
}
int I420Buffer::StrideV() const {
return stride_v_;
}
uint8_t* I420Buffer::MutableDataY() {
return const_cast<uint8_t*>(DataY());
}
uint8_t* I420Buffer::MutableDataU() {
return const_cast<uint8_t*>(DataU());
}
uint8_t* I420Buffer::MutableDataV() {
return const_cast<uint8_t*>(DataV());
}
// static
void I420Buffer::SetBlack(I420Buffer* buffer) {
RTC_CHECK(libyuv::I420Rect(buffer->MutableDataY(), buffer->StrideY(),
buffer->MutableDataU(), buffer->StrideU(),
buffer->MutableDataV(), buffer->StrideV(), 0, 0,
buffer->width(), buffer->height(), 0, 128,
128) == 0);
}
void I420Buffer::CropAndScaleFrom(const I420BufferInterface& 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* u_plane =
src.DataU() + src.StrideU() * uv_offset_y + uv_offset_x;
const uint8_t* v_plane =
src.DataV() + src.StrideV() * uv_offset_y + uv_offset_x;
int res =
libyuv::I420Scale(y_plane, src.StrideY(), u_plane, src.StrideU(), v_plane,
src.StrideV(), crop_width, crop_height, MutableDataY(),
StrideY(), MutableDataU(), StrideU(), MutableDataV(),
StrideV(), width(), height(), libyuv::kFilterBox);
RTC_DCHECK_EQ(res, 0);
}
void I420Buffer::CropAndScaleFrom(const I420BufferInterface& src) {
const int crop_width =
height() > 0 ? std::min(src.width(), width() * src.height() / height())
: src.width();
const int crop_height =
width() > 0 ? std::min(src.height(), height() * src.width() / width())
: src.height();
CropAndScaleFrom(src, (src.width() - crop_width) / 2,
(src.height() - crop_height) / 2, crop_width, crop_height);
}
void I420Buffer::ScaleFrom(const I420BufferInterface& src) {
CropAndScaleFrom(src, 0, 0, src.width(), src.height());
}
} // namespace webrtc