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