86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
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/*
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* Copyright (c) 2020 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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#ifndef API_VIDEO_NV12_BUFFER_H_
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#define API_VIDEO_NV12_BUFFER_H_
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#include <memory>
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#include <utility>
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#include "api/scoped_refptr.h"
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#include "api/video/video_frame_buffer.h"
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#include "rtc_base/memory/aligned_malloc.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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// NV12 is a biplanar encoding format, with full-resolution Y and
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// half-resolution interleved UV. More information can be found at
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// http://msdn.microsoft.com/library/windows/desktop/dd206750.aspx#nv12.
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class RTC_EXPORT NV12Buffer : public NV12BufferInterface {
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public:
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static rtc::scoped_refptr<NV12Buffer> Create(int width, int height);
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static rtc::scoped_refptr<NV12Buffer> Create(int width,
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int height,
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int stride_y,
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int stride_uv);
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static rtc::scoped_refptr<NV12Buffer> Copy(
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const I420BufferInterface& i420_buffer);
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rtc::scoped_refptr<I420BufferInterface> ToI420() override;
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int width() const override;
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int height() const override;
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int StrideY() const override;
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int StrideUV() const override;
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const uint8_t* DataY() const override;
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const uint8_t* DataUV() const override;
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uint8_t* MutableDataY();
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uint8_t* MutableDataUV();
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// Sets all three planes to all zeros. Used to work around for
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// quirks in memory checkers
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// (https://bugs.chromium.org/p/libyuv/issues/detail?id=377) and
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// ffmpeg (http://crbug.com/390941).
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// TODO(nisse): Deprecated. Should be deleted if/when those issues
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// are resolved in a better way. Or in the mean time, use SetBlack.
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void InitializeData();
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// Scale the cropped area of |src| to the size of |this| buffer, and
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// write the result into |this|.
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void CropAndScaleFrom(const NV12BufferInterface& 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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protected:
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NV12Buffer(int width, int height);
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NV12Buffer(int width, int height, int stride_y, int stride_uv);
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~NV12Buffer() override;
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private:
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size_t UVOffset() const;
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const int width_;
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const int height_;
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const int stride_y_;
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const int stride_uv_;
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const std::unique_ptr<uint8_t, AlignedFreeDeleter> data_;
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};
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} // namespace webrtc
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#endif // API_VIDEO_NV12_BUFFER_H_
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