i420_buffer.h - mozsearch

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/*

 *  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.

*/

#ifndef API_VIDEO_I420_BUFFER_H_

#define API_VIDEO_I420_BUFFER_H_

#include <stdint.h>

#include <memory>

#include "api/scoped_refptr.h"

#include "api/video/video_frame_buffer.h"

#include "api/video/video_rotation.h"

#include "rtc_base/memory/aligned_malloc.h"

#include "rtc_base/system/rtc_export.h"

namespace webrtc {

// Plain I420 buffer in standard memory.

class RTC_EXPORT I420Buffer : public I420BufferInterface {

 public:

  static rtc::scoped_refptr<I420Buffer> Create(int width, int height);

  static rtc::scoped_refptr<I420Buffer> Create(int width,

                                               int height,

                                               int stride_y,

                                               int stride_u,

                                               int stride_v);

  // Create a new buffer and copy the pixel data.

  static rtc::scoped_refptr<I420Buffer> Copy(const I420BufferInterface& buffer);

  // Deprecated.

  static rtc::scoped_refptr<I420Buffer> Copy(const VideoFrameBuffer& buffer) {

    return Copy(*buffer.GetI420());

  static rtc::scoped_refptr<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);

  // Returns a rotated copy of `src`.

  static rtc::scoped_refptr<I420Buffer> Rotate(const I420BufferInterface& src,

                                               VideoRotation rotation);

  // Deprecated.

  static rtc::scoped_refptr<I420Buffer> Rotate(const VideoFrameBuffer& src,

                                               VideoRotation rotation) {

    return Rotate(*src.GetI420(), rotation);

  // Sets the buffer to all black.

  static void SetBlack(I420Buffer* buffer);

  // 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(https://crbug.com/390941): Deprecated. Should be deleted if/when those

  // issues are resolved in a better way. Or in the mean time, use SetBlack.

  void InitializeData();

  int width() const override;

  int height() const override;

  const uint8_t* DataY() const override;

  const uint8_t* DataU() const override;

  const uint8_t* DataV() const override;

  int StrideY() const override;

  int StrideU() const override;

  int StrideV() const override;

  uint8_t* MutableDataY();

  uint8_t* MutableDataU();

  uint8_t* MutableDataV();

  // Scale the cropped area of `src` to the size of `this` buffer, and

  // write the result into `this`.

  void CropAndScaleFrom(const I420BufferInterface& src,

                        int offset_x,

                        int offset_y,

                        int crop_width,

                        int crop_height);

  // The common case of a center crop, when needed to adjust the

  // aspect ratio without distorting the image.

  void CropAndScaleFrom(const I420BufferInterface& src);

  // Scale all of `src` to the size of `this` buffer, with no cropping.

  void ScaleFrom(const I420BufferInterface& src);

 protected:

  I420Buffer(int width, int height);

  I420Buffer(int width, int height, int stride_y, int stride_u, int stride_v);

  ~I420Buffer() override;

 private:

  const int width_;

  const int height_;

  const int stride_y_;

  const int stride_u_;

  const int stride_v_;

  const std::unique_ptr<uint8_t, AlignedFreeDeleter> data_;

};

}  // namespace webrtc

#endif  // API_VIDEO_I420_BUFFER_H_