| /* |
| * 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 <utility> |
| |
| #include "libyuv/convert.h" |
| #include "libyuv/planar_functions.h" |
| #include "libyuv/scale.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/keep_ref_until_done.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 new rtc::RefCountedObject<I420Buffer>(width, height); |
| } |
| |
| // static |
| rtc::scoped_refptr<I420Buffer> I420Buffer::Create(int width, |
| int height, |
| int stride_y, |
| int stride_u, |
| int stride_v) { |
| return new rtc::RefCountedObject<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 = |
| std::min(src.width(), width() * src.height() / height()); |
| const int crop_height = |
| std::min(src.height(), height() * src.width() / width()); |
| |
| 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 |