mirror of
https://github.com/mollyim/webrtc.git
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233 lines
8 KiB
C++
233 lines
8 KiB
C++
/*
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* Copyright (c) 2021 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/i422_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 "api/make_ref_counted.h"
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#include "api/video/i420_buffer.h"
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#include "rtc_base/checks.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 I422DataSize(int height, int stride_y, int stride_u, int stride_v) {
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return stride_y * height + stride_u * height + stride_v * height;
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}
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} // namespace
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I422Buffer::I422Buffer(int width, int height)
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: I422Buffer(width, height, width, (width + 1) / 2, (width + 1) / 2) {}
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I422Buffer::I422Buffer(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(I422DataSize(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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I422Buffer::~I422Buffer() {}
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// static
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rtc::scoped_refptr<I422Buffer> I422Buffer::Create(int width, int height) {
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return rtc::make_ref_counted<I422Buffer>(width, height);
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}
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// static
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rtc::scoped_refptr<I422Buffer> I422Buffer::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<I422Buffer>(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<I422Buffer> I422Buffer::Copy(
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const I422BufferInterface& 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<I422Buffer> I422Buffer::Copy(
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const I420BufferInterface& source) {
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const int width = source.width();
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const int height = source.height();
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rtc::scoped_refptr<I422Buffer> buffer = Create(width, height);
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RTC_CHECK_EQ(
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0, libyuv::I420ToI422(
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source.DataY(), source.StrideY(), source.DataU(), source.StrideU(),
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source.DataV(), source.StrideV(), buffer->MutableDataY(),
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buffer->StrideY(), buffer->MutableDataU(), buffer->StrideU(),
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buffer->MutableDataV(), 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<I422Buffer> I422Buffer::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<I422Buffer> buffer = Create(width, height);
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RTC_CHECK_EQ(0, libyuv::I422Copy(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<I422Buffer> I422Buffer::Rotate(
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const I422BufferInterface& 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::I422Buffer> buffer =
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I422Buffer::Create(rotated_width, rotated_height);
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RTC_CHECK_EQ(0,
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libyuv::I422Rotate(
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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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rtc::scoped_refptr<I420BufferInterface> I422Buffer::ToI420() {
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rtc::scoped_refptr<I420Buffer> i420_buffer =
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I420Buffer::Create(width(), height());
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libyuv::I422ToI420(DataY(), StrideY(), DataU(), StrideU(), DataV(), StrideV(),
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i420_buffer->MutableDataY(), i420_buffer->StrideY(),
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i420_buffer->MutableDataU(), i420_buffer->StrideU(),
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i420_buffer->MutableDataV(), i420_buffer->StrideV(),
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width(), height());
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return i420_buffer;
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}
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void I422Buffer::InitializeData() {
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memset(data_.get(), 0,
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I422DataSize(height_, stride_y_, stride_u_, stride_v_));
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}
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int I422Buffer::width() const {
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return width_;
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}
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int I422Buffer::height() const {
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return height_;
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}
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const uint8_t* I422Buffer::DataY() const {
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return data_.get();
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}
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const uint8_t* I422Buffer::DataU() const {
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return data_.get() + stride_y_ * height_;
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}
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const uint8_t* I422Buffer::DataV() const {
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return data_.get() + stride_y_ * height_ + stride_u_ * height_;
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}
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int I422Buffer::StrideY() const {
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return stride_y_;
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}
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int I422Buffer::StrideU() const {
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return stride_u_;
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}
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int I422Buffer::StrideV() const {
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return stride_v_;
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}
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uint8_t* I422Buffer::MutableDataY() {
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return const_cast<uint8_t*>(DataY());
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}
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uint8_t* I422Buffer::MutableDataU() {
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return const_cast<uint8_t*>(DataU());
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}
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uint8_t* I422Buffer::MutableDataV() {
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return const_cast<uint8_t*>(DataV());
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}
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void I422Buffer::CropAndScaleFrom(const I422BufferInterface& 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;
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offset_x = uv_offset_x * 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::I422Scale(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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} // namespace webrtc
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