264 lines
9.1 KiB
C++
264 lines
9.1 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "api/video/i420_buffer.h"
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#include <string.h>
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#include <algorithm>
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#include <utility>
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#include "rtc_base/checks.h"
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#include "rtc_base/ref_counted_object.h"
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#include "third_party/libyuv/include/libyuv/convert.h"
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#include "third_party/libyuv/include/libyuv/planar_functions.h"
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#include "third_party/libyuv/include/libyuv/scale.h"
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// Aligning pointer to 64 bytes for improved performance, e.g. use SIMD.
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static const int kBufferAlignment = 64;
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namespace webrtc {
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namespace {
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int I420DataSize(int height, int stride_y, int stride_u, int stride_v) {
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return stride_y * height + (stride_u + stride_v) * ((height + 1) / 2);
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}
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} // namespace
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I420Buffer::I420Buffer(int width, int height)
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: I420Buffer(width, height, width, (width + 1) / 2, (width + 1) / 2) {}
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I420Buffer::I420Buffer(int width,
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int height,
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int stride_y,
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int stride_u,
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int stride_v)
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: width_(width),
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height_(height),
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stride_y_(stride_y),
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stride_u_(stride_u),
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stride_v_(stride_v),
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data_(static_cast<uint8_t*>(
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AlignedMalloc(I420DataSize(height, stride_y, stride_u, stride_v),
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kBufferAlignment))) {
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RTC_DCHECK_GT(width, 0);
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RTC_DCHECK_GT(height, 0);
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RTC_DCHECK_GE(stride_y, width);
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RTC_DCHECK_GE(stride_u, (width + 1) / 2);
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RTC_DCHECK_GE(stride_v, (width + 1) / 2);
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}
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I420Buffer::~I420Buffer() {}
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// static
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rtc::scoped_refptr<I420Buffer> I420Buffer::Create(int width, int height) {
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return rtc::make_ref_counted<I420Buffer>(width, height);
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}
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// static
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rtc::scoped_refptr<I420Buffer> I420Buffer::Create(int width,
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int height,
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int stride_y,
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int stride_u,
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int stride_v) {
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return rtc::make_ref_counted<I420Buffer>(width, height, stride_y, stride_u,
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stride_v);
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}
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// static
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rtc::scoped_refptr<I420Buffer> I420Buffer::Copy(
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const I420BufferInterface& source) {
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return Copy(source.width(), source.height(), source.DataY(), source.StrideY(),
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source.DataU(), source.StrideU(), source.DataV(),
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source.StrideV());
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}
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// static
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rtc::scoped_refptr<I420Buffer> I420Buffer::Copy(int width,
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int height,
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const uint8_t* data_y,
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int stride_y,
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const uint8_t* data_u,
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int stride_u,
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const uint8_t* data_v,
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int stride_v) {
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// Note: May use different strides than the input data.
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rtc::scoped_refptr<I420Buffer> buffer = Create(width, height);
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RTC_CHECK_EQ(0, libyuv::I420Copy(data_y, stride_y, data_u, stride_u, data_v,
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stride_v, buffer->MutableDataY(),
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buffer->StrideY(), buffer->MutableDataU(),
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buffer->StrideU(), buffer->MutableDataV(),
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buffer->StrideV(), width, height));
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return buffer;
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}
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// static
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rtc::scoped_refptr<I420Buffer> I420Buffer::Rotate(
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const I420BufferInterface& src,
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VideoRotation rotation) {
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RTC_CHECK(src.DataY());
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RTC_CHECK(src.DataU());
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RTC_CHECK(src.DataV());
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int rotated_width = src.width();
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int rotated_height = src.height();
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if (rotation == webrtc::kVideoRotation_90 ||
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rotation == webrtc::kVideoRotation_270) {
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std::swap(rotated_width, rotated_height);
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}
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rtc::scoped_refptr<webrtc::I420Buffer> buffer =
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I420Buffer::Create(rotated_width, rotated_height);
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RTC_CHECK_EQ(0,
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libyuv::I420Rotate(
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src.DataY(), src.StrideY(), src.DataU(), src.StrideU(),
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src.DataV(), src.StrideV(), buffer->MutableDataY(),
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buffer->StrideY(), buffer->MutableDataU(), buffer->StrideU(),
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buffer->MutableDataV(), buffer->StrideV(), src.width(),
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src.height(), static_cast<libyuv::RotationMode>(rotation)));
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return buffer;
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}
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void I420Buffer::InitializeData() {
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memset(data_.get(), 0,
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I420DataSize(height_, stride_y_, stride_u_, stride_v_));
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}
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int I420Buffer::width() const {
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return width_;
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}
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int I420Buffer::height() const {
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return height_;
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}
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const uint8_t* I420Buffer::DataY() const {
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return data_.get();
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}
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const uint8_t* I420Buffer::DataU() const {
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return data_.get() + stride_y_ * height_;
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}
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const uint8_t* I420Buffer::DataV() const {
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return data_.get() + stride_y_ * height_ + stride_u_ * ((height_ + 1) / 2);
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}
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int I420Buffer::StrideY() const {
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return stride_y_;
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}
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int I420Buffer::StrideU() const {
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return stride_u_;
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}
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int I420Buffer::StrideV() const {
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return stride_v_;
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}
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uint8_t* I420Buffer::MutableDataY() {
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return const_cast<uint8_t*>(DataY());
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}
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uint8_t* I420Buffer::MutableDataU() {
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return const_cast<uint8_t*>(DataU());
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}
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uint8_t* I420Buffer::MutableDataV() {
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return const_cast<uint8_t*>(DataV());
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}
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// static
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void I420Buffer::SetBlack(I420Buffer* buffer) {
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RTC_CHECK(libyuv::I420Rect(buffer->MutableDataY(), buffer->StrideY(),
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buffer->MutableDataU(), buffer->StrideU(),
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buffer->MutableDataV(), buffer->StrideV(), 0, 0,
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buffer->width(), buffer->height(), 0, 128,
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128) == 0);
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}
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void I420Buffer::CropAndScaleFrom(const I420BufferInterface& src,
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int offset_x,
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int offset_y,
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int crop_width,
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int crop_height) {
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RTC_CHECK_LE(crop_width, src.width());
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RTC_CHECK_LE(crop_height, src.height());
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RTC_CHECK_LE(crop_width + offset_x, src.width());
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RTC_CHECK_LE(crop_height + offset_y, src.height());
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RTC_CHECK_GE(offset_x, 0);
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RTC_CHECK_GE(offset_y, 0);
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// Make sure offset is even so that u/v plane becomes aligned.
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const int uv_offset_x = offset_x / 2;
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const int uv_offset_y = offset_y / 2;
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offset_x = uv_offset_x * 2;
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offset_y = uv_offset_y * 2;
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const uint8_t* y_plane = src.DataY() + src.StrideY() * offset_y + offset_x;
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const uint8_t* u_plane =
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src.DataU() + src.StrideU() * uv_offset_y + uv_offset_x;
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const uint8_t* v_plane =
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src.DataV() + src.StrideV() * uv_offset_y + uv_offset_x;
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int res =
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libyuv::I420Scale(y_plane, src.StrideY(), u_plane, src.StrideU(), v_plane,
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src.StrideV(), crop_width, crop_height, MutableDataY(),
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StrideY(), MutableDataU(), StrideU(), MutableDataV(),
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StrideV(), width(), height(), libyuv::kFilterBox);
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RTC_DCHECK_EQ(res, 0);
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}
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void I420Buffer::CropAndScaleFrom(const I420BufferInterface& src) {
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const int crop_width =
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height() > 0 ? std::min(src.width(), width() * src.height() / height())
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: src.width();
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const int crop_height =
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width() > 0 ? std::min(src.height(), height() * src.width() / width())
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: src.height();
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CropAndScaleFrom(src, (src.width() - crop_width) / 2,
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(src.height() - crop_height) / 2, crop_width, crop_height);
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}
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void I420Buffer::ScaleFrom(const I420BufferInterface& src) {
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CropAndScaleFrom(src, 0, 0, src.width(), src.height());
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}
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void I420Buffer::PasteFrom(const I420BufferInterface& picture,
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int offset_col,
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int offset_row) {
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RTC_CHECK_LE(picture.width() + offset_col, width());
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RTC_CHECK_LE(picture.height() + offset_row, height());
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RTC_CHECK_GE(offset_col, 0);
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RTC_CHECK_GE(offset_row, 0);
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// Pasted picture has to be aligned so subsumpled UV plane isn't corrupted.
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RTC_CHECK(offset_col % 2 == 0);
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RTC_CHECK(offset_row % 2 == 0);
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RTC_CHECK(picture.width() % 2 == 0 ||
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picture.width() + offset_col == width());
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RTC_CHECK(picture.height() % 2 == 0 ||
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picture.height() + offset_row == height());
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libyuv::CopyPlane(picture.DataY(), picture.StrideY(),
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MutableDataY() + StrideY() * offset_row + offset_col,
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StrideY(), picture.width(), picture.height());
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libyuv::CopyPlane(
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picture.DataU(), picture.StrideU(),
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MutableDataU() + StrideU() * offset_row / 2 + offset_col / 2, StrideU(),
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picture.width() / 2, picture.height() / 2);
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libyuv::CopyPlane(
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picture.DataV(), picture.StrideV(),
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MutableDataV() + StrideV() * offset_row / 2 + offset_col / 2, StrideV(),
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picture.width() / 2, picture.height() / 2);
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}
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} // namespace webrtc
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