api/video/i210_buffer.cc - src - Git at Google

 /*
  *  Copyright (c) 2022 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/i210_buffer.h"

 #include <utility>

 #include "api/make_ref_counted.h"
 #include "api/video/i420_buffer.h"
 #include "api/video/i422_buffer.h"
 #include "rtc_base/checks.h"
 #include "third_party/libyuv/include/libyuv/convert.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;
 static const int kBytesPerPixel = 2;

 namespace webrtc {

 namespace {

 int I210DataSize(int height, int stride_y, int stride_u, int stride_v) {
   return kBytesPerPixel *
          (stride_y * height + stride_u * height + stride_v * height);
 }

 void webrtcRotatePlane90_16(const uint16_t* src,
                             int src_stride,
                             uint16_t* dst,
                             int dst_stride,
                             int width,
                             int height) {
   for (int x = 0; x < width; x++) {
     for (int y = 0; y < height; y++) {
       int dest_x = height - y - 1;
       int dest_y = x;
       dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
     }
   }
 }

 void webrtcRotatePlane180_16(const uint16_t* src,
                              int src_stride,
                              uint16_t* dst,
                              int dst_stride,
                              int width,
                              int height) {
   for (int x = 0; x < width; x++) {
     for (int y = 0; y < height; y++) {
       int dest_x = width - x - 1;
       int dest_y = height - y - 1;
       dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
     }
   }
 }

 void webrtcRotatePlane270_16(const uint16_t* src,
                              int src_stride,
                              uint16_t* dst,
                              int dst_stride,
                              int width,
                              int height) {
   for (int x = 0; x < width; x++) {
     for (int y = 0; y < height; y++) {
       int dest_x = y;
       int dest_y = width - x - 1;
       dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
     }
   }
 }

 // TODO(sergio.garcia.murillo@gmail.com): Remove as soon it is available in
 // libyuv. Due to the rotate&scale required, this function may not be merged in
 // to libyuv inmediatelly.
 // https://bugs.chromium.org/p/libyuv/issues/detail?id=926
 // This method assumes continuous allocation of the y-plane, possibly clobbering
 // any padding between pixel rows.
 int webrtcI210Rotate(const uint16_t* src_y,
                      int src_stride_y,
                      const uint16_t* src_u,
                      int src_stride_u,
                      const uint16_t* src_v,
                      int src_stride_v,
                      uint16_t* dst_y,
                      int dst_stride_y,
                      uint16_t* dst_u,
                      int dst_stride_u,
                      uint16_t* dst_v,
                      int dst_stride_v,
                      int width,
                      int height,
                      enum libyuv::RotationMode mode) {
   int halfwidth = (width + 1) >> 1;
   int halfheight = (height + 1) >> 1;
   if (!src_y || !src_u || !src_v || width <= 0 || height == 0 || !dst_y ||
       !dst_u || !dst_v || dst_stride_y < 0) {
     return -1;
   }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
     src_y = src_y + (height - 1) * src_stride_y;
     src_u = src_u + (height - 1) * src_stride_u;
     src_v = src_v + (height - 1) * src_stride_v;
     src_stride_y = -src_stride_y;
     src_stride_u = -src_stride_u;
     src_stride_v = -src_stride_v;
   }

   switch (mode) {
     case libyuv::kRotate0:
       // copy frame
       libyuv::CopyPlane_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
                            height);
       libyuv::CopyPlane_16(src_u, src_stride_u, dst_u, dst_stride_u, halfwidth,
                            height);
       libyuv::CopyPlane_16(src_v, src_stride_v, dst_v, dst_stride_v, halfwidth,
                            height);
       return 0;
     case libyuv::kRotate90:
       // We need to rotate and rescale, we use plane Y as temporal storage.
       webrtcRotatePlane90_16(src_u, src_stride_u, dst_y, height, halfwidth,
                              height);
       libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_u, halfheight,
                             halfheight, width, libyuv::kFilterBilinear);
       webrtcRotatePlane90_16(src_v, src_stride_v, dst_y, height, halfwidth,
                              height);
       libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_v, halfheight,
                             halfheight, width, libyuv::kFilterLinear);
       webrtcRotatePlane90_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
                              height);
       return 0;
     case libyuv::kRotate270:
       // We need to rotate and rescale, we use plane Y as temporal storage.
       webrtcRotatePlane270_16(src_u, src_stride_u, dst_y, height, halfwidth,
                               height);
       libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_u, halfheight,
                             halfheight, width, libyuv::kFilterBilinear);
       webrtcRotatePlane270_16(src_v, src_stride_v, dst_y, height, halfwidth,
                               height);
       libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_v, halfheight,
                             halfheight, width, libyuv::kFilterLinear);
       webrtcRotatePlane270_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
                               height);

       return 0;
     case libyuv::kRotate180:
       webrtcRotatePlane180_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
                               height);
       webrtcRotatePlane180_16(src_u, src_stride_u, dst_u, dst_stride_u,
                               halfwidth, height);
       webrtcRotatePlane180_16(src_v, src_stride_v, dst_v, dst_stride_v,
                               halfwidth, height);
       return 0;
     default:
       break;
   }
   return -1;
 }

 }  // namespace

 I210Buffer::I210Buffer(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<uint16_t*>(
           AlignedMalloc(I210DataSize(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);
 }

 I210Buffer::~I210Buffer() {}

 // static
 rtc::scoped_refptr<I210Buffer> I210Buffer::Create(int width, int height) {
   return rtc::make_ref_counted<I210Buffer>(width, height, width,
                                            (width + 1) / 2, (width + 1) / 2);
 }

 // static
 rtc::scoped_refptr<I210Buffer> I210Buffer::Copy(
     const I210BufferInterface& source) {
   const int width = source.width();
   const int height = source.height();
   rtc::scoped_refptr<I210Buffer> buffer = Create(width, height);
   RTC_CHECK_EQ(
       0, libyuv::I210Copy(
              source.DataY(), source.StrideY(), source.DataU(), source.StrideU(),
              source.DataV(), source.StrideV(), buffer->MutableDataY(),
              buffer->StrideY(), buffer->MutableDataU(), buffer->StrideU(),
              buffer->MutableDataV(), buffer->StrideV(), width, height));
   return buffer;
 }

 // static
 rtc::scoped_refptr<I210Buffer> I210Buffer::Copy(
     const I420BufferInterface& source) {
   const int width = source.width();
   const int height = source.height();
   auto i422buffer = I422Buffer::Copy(source);
   rtc::scoped_refptr<I210Buffer> buffer = Create(width, height);
   RTC_CHECK_EQ(0, libyuv::I422ToI210(i422buffer->DataY(), i422buffer->StrideY(),
                                      i422buffer->DataU(), i422buffer->StrideU(),
                                      i422buffer->DataV(), i422buffer->StrideV(),
                                      buffer->MutableDataY(), buffer->StrideY(),
                                      buffer->MutableDataU(), buffer->StrideU(),
                                      buffer->MutableDataV(), buffer->StrideV(),
                                      width, height));
   return buffer;
 }

 // static
 rtc::scoped_refptr<I210Buffer> I210Buffer::Rotate(
     const I210BufferInterface& 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::I210Buffer> buffer =
       I210Buffer::Create(rotated_width, rotated_height);

   RTC_CHECK_EQ(0,
                webrtcI210Rotate(
                    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;
 }

 rtc::scoped_refptr<I420BufferInterface> I210Buffer::ToI420() {
   rtc::scoped_refptr<I420Buffer> i420_buffer =
       I420Buffer::Create(width(), height());
   libyuv::I210ToI420(DataY(), StrideY(), DataU(), StrideU(), DataV(), StrideV(),
                      i420_buffer->MutableDataY(), i420_buffer->StrideY(),
                      i420_buffer->MutableDataU(), i420_buffer->StrideU(),
                      i420_buffer->MutableDataV(), i420_buffer->StrideV(),
                      width(), height());
   return i420_buffer;
 }

 int I210Buffer::width() const {
   return width_;
 }

 int I210Buffer::height() const {
   return height_;
 }

 const uint16_t* I210Buffer::DataY() const {
   return data_.get();
 }
 const uint16_t* I210Buffer::DataU() const {
   return data_.get() + stride_y_ * height_;
 }
 const uint16_t* I210Buffer::DataV() const {
   return data_.get() + stride_y_ * height_ + stride_u_ * height_;
 }

 int I210Buffer::StrideY() const {
   return stride_y_;
 }
 int I210Buffer::StrideU() const {
   return stride_u_;
 }
 int I210Buffer::StrideV() const {
   return stride_v_;
 }

 uint16_t* I210Buffer::MutableDataY() {
   return const_cast<uint16_t*>(DataY());
 }
 uint16_t* I210Buffer::MutableDataU() {
   return const_cast<uint16_t*>(DataU());
 }
 uint16_t* I210Buffer::MutableDataV() {
   return const_cast<uint16_t*>(DataV());
 }

 void I210Buffer::CropAndScaleFrom(const I210BufferInterface& 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);
   RTC_CHECK_GE(crop_width, 0);
   RTC_CHECK_GE(crop_height, 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;
   offset_x = uv_offset_x * 2;

   const uint16_t* y_plane = src.DataY() + src.StrideY() * offset_y + offset_x;
   const uint16_t* u_plane =
       src.DataU() + src.StrideU() * uv_offset_y + uv_offset_x;
   const uint16_t* v_plane =
       src.DataV() + src.StrideV() * uv_offset_y + uv_offset_x;
   int res = libyuv::I422Scale_16(
       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 I210Buffer::ScaleFrom(const I210BufferInterface& src) {
   CropAndScaleFrom(src, 0, 0, src.width(), src.height());
 }

 }  // namespace webrtc
	/*
	* Copyright (c) 2022 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/i210_buffer.h"

	#include <utility>

	#include "api/make_ref_counted.h"
	#include "api/video/i420_buffer.h"
	#include "api/video/i422_buffer.h"
	#include "rtc_base/checks.h"
	#include "third_party/libyuv/include/libyuv/convert.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;
	static const int kBytesPerPixel = 2;

	namespace webrtc {

	namespace {

	int I210DataSize(int height, int stride_y, int stride_u, int stride_v) {
	return kBytesPerPixel *
	(stride_y * height + stride_u * height + stride_v * height);
	}

	void webrtcRotatePlane90_16(const uint16_t* src,
	int src_stride,
	uint16_t* dst,
	int dst_stride,
	int width,
	int height) {
	for (int x = 0; x < width; x++) {
	for (int y = 0; y < height; y++) {
	int dest_x = height - y - 1;
	int dest_y = x;
	dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
	}
	}
	}

	void webrtcRotatePlane180_16(const uint16_t* src,
	int src_stride,
	uint16_t* dst,
	int dst_stride,
	int width,
	int height) {
	for (int x = 0; x < width; x++) {
	for (int y = 0; y < height; y++) {
	int dest_x = width - x - 1;
	int dest_y = height - y - 1;
	dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
	}
	}
	}

	void webrtcRotatePlane270_16(const uint16_t* src,
	int src_stride,
	uint16_t* dst,
	int dst_stride,
	int width,
	int height) {
	for (int x = 0; x < width; x++) {
	for (int y = 0; y < height; y++) {
	int dest_x = y;
	int dest_y = width - x - 1;
	dst[dest_x + dst_stride * dest_y] = src[x + src_stride * y];
	}
	}
	}

	// TODO(sergio.garcia.murillo@gmail.com): Remove as soon it is available in
	// libyuv. Due to the rotate&scale required, this function may not be merged in
	// to libyuv inmediatelly.
	// https://bugs.chromium.org/p/libyuv/issues/detail?id=926
	// This method assumes continuous allocation of the y-plane, possibly clobbering
	// any padding between pixel rows.
	int webrtcI210Rotate(const uint16_t* src_y,
	int src_stride_y,
	const uint16_t* src_u,
	int src_stride_u,
	const uint16_t* src_v,
	int src_stride_v,
	uint16_t* dst_y,
	int dst_stride_y,
	uint16_t* dst_u,
	int dst_stride_u,
	uint16_t* dst_v,
	int dst_stride_v,
	int width,
	int height,
	enum libyuv::RotationMode mode) {
	int halfwidth = (width + 1) >> 1;
	int halfheight = (height + 1) >> 1;
	if (!src_y \|\| !src_u \|\| !src_v \|\| width <= 0 \|\| height == 0 \|\| !dst_y \|\|
	!dst_u \|\| !dst_v \|\| dst_stride_y < 0) {
	return -1;
	}
	// Negative height means invert the image.
	if (height < 0) {
	height = -height;
	src_y = src_y + (height - 1) * src_stride_y;
	src_u = src_u + (height - 1) * src_stride_u;
	src_v = src_v + (height - 1) * src_stride_v;
	src_stride_y = -src_stride_y;
	src_stride_u = -src_stride_u;
	src_stride_v = -src_stride_v;
	}

	switch (mode) {
	case libyuv::kRotate0:
	// copy frame
	libyuv::CopyPlane_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
	height);
	libyuv::CopyPlane_16(src_u, src_stride_u, dst_u, dst_stride_u, halfwidth,
	height);
	libyuv::CopyPlane_16(src_v, src_stride_v, dst_v, dst_stride_v, halfwidth,
	height);
	return 0;
	case libyuv::kRotate90:
	// We need to rotate and rescale, we use plane Y as temporal storage.
	webrtcRotatePlane90_16(src_u, src_stride_u, dst_y, height, halfwidth,
	height);
	libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_u, halfheight,
	halfheight, width, libyuv::kFilterBilinear);
	webrtcRotatePlane90_16(src_v, src_stride_v, dst_y, height, halfwidth,
	height);
	libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_v, halfheight,
	halfheight, width, libyuv::kFilterLinear);
	webrtcRotatePlane90_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
	height);
	return 0;
	case libyuv::kRotate270:
	// We need to rotate and rescale, we use plane Y as temporal storage.
	webrtcRotatePlane270_16(src_u, src_stride_u, dst_y, height, halfwidth,
	height);
	libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_u, halfheight,
	halfheight, width, libyuv::kFilterBilinear);
	webrtcRotatePlane270_16(src_v, src_stride_v, dst_y, height, halfwidth,
	height);
	libyuv::ScalePlane_16(dst_y, height, height, halfwidth, dst_v, halfheight,
	halfheight, width, libyuv::kFilterLinear);
	webrtcRotatePlane270_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
	height);

	return 0;
	case libyuv::kRotate180:
	webrtcRotatePlane180_16(src_y, src_stride_y, dst_y, dst_stride_y, width,
	height);
	webrtcRotatePlane180_16(src_u, src_stride_u, dst_u, dst_stride_u,
	halfwidth, height);
	webrtcRotatePlane180_16(src_v, src_stride_v, dst_v, dst_stride_v,
	halfwidth, height);
	return 0;
	default:
	break;
	}
	return -1;
	}

	} // namespace

	I210Buffer::I210Buffer(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<uint16_t*>(
	AlignedMalloc(I210DataSize(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);
	}

	I210Buffer::~I210Buffer() {}

	// static
	rtc::scoped_refptr<I210Buffer> I210Buffer::Create(int width, int height) {
	return rtc::make_ref_counted<I210Buffer>(width, height, width,
	(width + 1) / 2, (width + 1) / 2);
	}

	// static
	rtc::scoped_refptr<I210Buffer> I210Buffer::Copy(
	const I210BufferInterface& source) {
	const int width = source.width();
	const int height = source.height();
	rtc::scoped_refptr<I210Buffer> buffer = Create(width, height);
	RTC_CHECK_EQ(
	0, libyuv::I210Copy(
	source.DataY(), source.StrideY(), source.DataU(), source.StrideU(),
	source.DataV(), source.StrideV(), buffer->MutableDataY(),
	buffer->StrideY(), buffer->MutableDataU(), buffer->StrideU(),
	buffer->MutableDataV(), buffer->StrideV(), width, height));
	return buffer;
	}

	// static
	rtc::scoped_refptr<I210Buffer> I210Buffer::Copy(
	const I420BufferInterface& source) {
	const int width = source.width();
	const int height = source.height();
	auto i422buffer = I422Buffer::Copy(source);
	rtc::scoped_refptr<I210Buffer> buffer = Create(width, height);
	RTC_CHECK_EQ(0, libyuv::I422ToI210(i422buffer->DataY(), i422buffer->StrideY(),
	i422buffer->DataU(), i422buffer->StrideU(),
	i422buffer->DataV(), i422buffer->StrideV(),
	buffer->MutableDataY(), buffer->StrideY(),
	buffer->MutableDataU(), buffer->StrideU(),
	buffer->MutableDataV(), buffer->StrideV(),
	width, height));
	return buffer;
	}

	// static
	rtc::scoped_refptr<I210Buffer> I210Buffer::Rotate(
	const I210BufferInterface& 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::I210Buffer> buffer =
	I210Buffer::Create(rotated_width, rotated_height);

	RTC_CHECK_EQ(0,
	webrtcI210Rotate(
	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;
	}

	rtc::scoped_refptr<I420BufferInterface> I210Buffer::ToI420() {
	rtc::scoped_refptr<I420Buffer> i420_buffer =
	I420Buffer::Create(width(), height());
	libyuv::I210ToI420(DataY(), StrideY(), DataU(), StrideU(), DataV(), StrideV(),
	i420_buffer->MutableDataY(), i420_buffer->StrideY(),
	i420_buffer->MutableDataU(), i420_buffer->StrideU(),
	i420_buffer->MutableDataV(), i420_buffer->StrideV(),
	width(), height());
	return i420_buffer;
	}

	int I210Buffer::width() const {
	return width_;
	}

	int I210Buffer::height() const {
	return height_;
	}

	const uint16_t* I210Buffer::DataY() const {
	return data_.get();
	}
	const uint16_t* I210Buffer::DataU() const {
	return data_.get() + stride_y_ * height_;
	}
	const uint16_t* I210Buffer::DataV() const {
	return data_.get() + stride_y_ * height_ + stride_u_ * height_;
	}

	int I210Buffer::StrideY() const {
	return stride_y_;
	}
	int I210Buffer::StrideU() const {
	return stride_u_;
	}
	int I210Buffer::StrideV() const {
	return stride_v_;
	}

	uint16_t* I210Buffer::MutableDataY() {
	return const_cast<uint16_t*>(DataY());
	}
	uint16_t* I210Buffer::MutableDataU() {
	return const_cast<uint16_t*>(DataU());
	}
	uint16_t* I210Buffer::MutableDataV() {
	return const_cast<uint16_t*>(DataV());
	}

	void I210Buffer::CropAndScaleFrom(const I210BufferInterface& 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);
	RTC_CHECK_GE(crop_width, 0);
	RTC_CHECK_GE(crop_height, 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;
	offset_x = uv_offset_x * 2;

	const uint16_t* y_plane = src.DataY() + src.StrideY() * offset_y + offset_x;
	const uint16_t* u_plane =
	src.DataU() + src.StrideU() * uv_offset_y + uv_offset_x;
	const uint16_t* v_plane =
	src.DataV() + src.StrideV() * uv_offset_y + uv_offset_x;
	int res = libyuv::I422Scale_16(
	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 I210Buffer::ScaleFrom(const I210BufferInterface& src) {
	CropAndScaleFrom(src, 0, 0, src.width(), src.height());
	}

	} // namespace webrtc