diff options
Diffstat (limited to 'third_party/libwebrtc/api/video/nv12_buffer.cc')
| -rw-r--r-- | third_party/libwebrtc/api/video/nv12_buffer.cc | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video/nv12_buffer.cc b/third_party/libwebrtc/api/video/nv12_buffer.cc new file mode 100644 index 0000000000..ca9dcd8677 --- /dev/null +++ b/third_party/libwebrtc/api/video/nv12_buffer.cc @@ -0,0 +1,155 @@ +/* + * Copyright (c) 2020 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/nv12_buffer.h" + +#include "api/make_ref_counted.h" +#include "api/video/i420_buffer.h" +#include "rtc_base/checks.h" +#include "third_party/libyuv/include/libyuv/convert.h" +#include "third_party/libyuv/include/libyuv/scale.h" + +namespace webrtc { + +namespace { + +static const int kBufferAlignment = 64; + +int NV12DataSize(int height, int stride_y, int stride_uv) { + return stride_y * height + stride_uv * ((height + 1) / 2); +} + +} // namespace + +NV12Buffer::NV12Buffer(int width, int height) + : NV12Buffer(width, height, width, width + width % 2) {} + +NV12Buffer::NV12Buffer(int width, int height, int stride_y, int stride_uv) + : width_(width), + height_(height), + stride_y_(stride_y), + stride_uv_(stride_uv), + data_(static_cast<uint8_t*>( + AlignedMalloc(NV12DataSize(height_, stride_y_, stride_uv), + kBufferAlignment))) { + RTC_DCHECK_GT(width, 0); + RTC_DCHECK_GT(height, 0); + RTC_DCHECK_GE(stride_y, width); + RTC_DCHECK_GE(stride_uv, (width + width % 2)); +} + +NV12Buffer::~NV12Buffer() = default; + +// static +rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width, int height) { + return rtc::make_ref_counted<NV12Buffer>(width, height); +} + +// static +rtc::scoped_refptr<NV12Buffer> NV12Buffer::Create(int width, + int height, + int stride_y, + int stride_uv) { + return rtc::make_ref_counted<NV12Buffer>(width, height, stride_y, stride_uv); +} + +// static +rtc::scoped_refptr<NV12Buffer> NV12Buffer::Copy( + const I420BufferInterface& i420_buffer) { + rtc::scoped_refptr<NV12Buffer> buffer = + NV12Buffer::Create(i420_buffer.width(), i420_buffer.height()); + libyuv::I420ToNV12( + i420_buffer.DataY(), i420_buffer.StrideY(), i420_buffer.DataU(), + i420_buffer.StrideU(), i420_buffer.DataV(), i420_buffer.StrideV(), + buffer->MutableDataY(), buffer->StrideY(), buffer->MutableDataUV(), + buffer->StrideUV(), buffer->width(), buffer->height()); + return buffer; +} + +rtc::scoped_refptr<I420BufferInterface> NV12Buffer::ToI420() { + rtc::scoped_refptr<I420Buffer> i420_buffer = + I420Buffer::Create(width(), height()); + libyuv::NV12ToI420(DataY(), StrideY(), DataUV(), StrideUV(), + i420_buffer->MutableDataY(), i420_buffer->StrideY(), + i420_buffer->MutableDataU(), i420_buffer->StrideU(), + i420_buffer->MutableDataV(), i420_buffer->StrideV(), + width(), height()); + return i420_buffer; +} + +int NV12Buffer::width() const { + return width_; +} +int NV12Buffer::height() const { + return height_; +} + +int NV12Buffer::StrideY() const { + return stride_y_; +} +int NV12Buffer::StrideUV() const { + return stride_uv_; +} + +const uint8_t* NV12Buffer::DataY() const { + return data_.get(); +} + +const uint8_t* NV12Buffer::DataUV() const { + return data_.get() + UVOffset(); +} + +uint8_t* NV12Buffer::MutableDataY() { + return data_.get(); +} + +uint8_t* NV12Buffer::MutableDataUV() { + return data_.get() + UVOffset(); +} + +size_t NV12Buffer::UVOffset() const { + return stride_y_ * height_; +} + +void NV12Buffer::InitializeData() { + memset(data_.get(), 0, NV12DataSize(height_, stride_y_, stride_uv_)); +} + +void NV12Buffer::CropAndScaleFrom(const NV12BufferInterface& 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* uv_plane = + src.DataUV() + src.StrideUV() * uv_offset_y + uv_offset_x * 2; + + int res = libyuv::NV12Scale(y_plane, src.StrideY(), uv_plane, src.StrideUV(), + crop_width, crop_height, MutableDataY(), + StrideY(), MutableDataUV(), StrideUV(), width(), + height(), libyuv::kFilterBox); + + RTC_DCHECK_EQ(res, 0); +} + +} // namespace webrtc |