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Diffstat (limited to '')
| -rw-r--r-- | third_party/libwebrtc/api/video/i420_buffer.cc | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video/i420_buffer.cc b/third_party/libwebrtc/api/video/i420_buffer.cc new file mode 100644 index 0000000000..bf7fc06ee9 --- /dev/null +++ b/third_party/libwebrtc/api/video/i420_buffer.cc @@ -0,0 +1,232 @@ +/* + * 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 "api/make_ref_counted.h" +#include "rtc_base/checks.h" +#include "third_party/libyuv/include/libyuv/convert.h" +#include "third_party/libyuv/include/libyuv/planar_functions.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 |