/*
 *  Copyright (c) 2012 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.
 */

/*
 * WebRTC's wrapper to libyuv.
 */

#ifndef COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_
#define COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_

#include <stdint.h>
#include <stdio.h>

#include <vector>

#include "api/scoped_refptr.h"
#include "api/video/video_frame.h"
#include "api/video/video_frame_buffer.h"
#include "rtc_base/system/rtc_export.h"

namespace webrtc {

enum class VideoType {
  kUnknown,
  kI420,
  kIYUV,
  kRGB24,
  kARGB,
  kRGB565,
  kYUY2,
  kYV12,
  kUYVY,
  kMJPEG,
  kBGRA,
};

// This is the max PSNR value our algorithms can return.
const double kPerfectPSNR = 48.0f;

// Calculate the required buffer size.
// Input:
//   - type         :The type of the designated video frame.
//   - width        :frame width in pixels.
//   - height       :frame height in pixels.
// Return value:    :The required size in bytes to accommodate the specified
//                   video frame.
size_t CalcBufferSize(VideoType type, int width, int height);

// Extract buffer from VideoFrame or I420BufferInterface (consecutive
// planes, no stride)
// Input:
//   - frame       : Reference to video frame.
//   - size        : pointer to the size of the allocated buffer. If size is
//                   insufficient, an error will be returned.
//   - buffer      : Pointer to buffer
// Return value: length of buffer if OK, < 0 otherwise.
int ExtractBuffer(const rtc::scoped_refptr<I420BufferInterface>& input_frame,
                  size_t size,
                  uint8_t* buffer);
int ExtractBuffer(const VideoFrame& input_frame, size_t size, uint8_t* buffer);
// Convert From I420
// Input:
//   - src_frame        : Reference to a source frame.
//   - dst_video_type   : Type of output video.
//   - dst_sample_size  : Required only for the parsing of MJPG.
//   - dst_frame        : Pointer to a destination frame.
// Return value: 0 if OK, < 0 otherwise.
// It is assumed that source and destination have equal height.
int ConvertFromI420(const VideoFrame& src_frame,
                    VideoType dst_video_type,
                    int dst_sample_size,
                    uint8_t* dst_frame);

rtc::scoped_refptr<I420BufferInterface> ScaleVideoFrameBuffer(
    const I420BufferInterface& source,
    int dst_width,
    int dst_height);

double I420SSE(const I420BufferInterface& ref_buffer,
               const I420BufferInterface& test_buffer);

// Compute PSNR for an I420 frame (all planes).
// Returns the PSNR in decibel, to a maximum of kPerfectPSNR.
double I420PSNR(const VideoFrame* ref_frame, const VideoFrame* test_frame);
double I420PSNR(const I420BufferInterface& ref_buffer,
                const I420BufferInterface& test_buffer);

// Computes the weighted PSNR-YUV for an I420 buffer.
//
// For the definition and motivation, see
// J. Ohm, G. J. Sullivan, H. Schwarz, T. K. Tan and T. Wiegand,
// "Comparison of the Coding Efficiency of Video Coding Standards—Including
// High Efficiency Video Coding (HEVC)," in IEEE Transactions on Circuits and
// Systems for Video Technology, vol. 22, no. 12, pp. 1669-1684, Dec. 2012
// doi: 10.1109/TCSVT.2012.2221192.
//
// Returns the PSNR-YUV in decibel, to a maximum of kPerfectPSNR.
double I420WeightedPSNR(const I420BufferInterface& ref_buffer,
                        const I420BufferInterface& test_buffer);

// Compute SSIM for an I420 frame (all planes).
double I420SSIM(const VideoFrame* ref_frame, const VideoFrame* test_frame);
double I420SSIM(const I420BufferInterface& ref_buffer,
                const I420BufferInterface& test_buffer);

// Helper function for scaling NV12 to NV12.
// If the `src_width` and `src_height` matches the `dst_width` and `dst_height`,
// then `tmp_buffer` is not used. In other cases, the minimum size of
// `tmp_buffer` should be:
//   (src_width/2) * (src_height/2) * 2 + (dst_width/2) * (dst_height/2) * 2
void NV12Scale(uint8_t* tmp_buffer,
               const uint8_t* src_y,
               int src_stride_y,
               const uint8_t* src_uv,
               int src_stride_uv,
               int src_width,
               int src_height,
               uint8_t* dst_y,
               int dst_stride_y,
               uint8_t* dst_uv,
               int dst_stride_uv,
               int dst_width,
               int dst_height);

// Helper class for directly converting and scaling NV12 to I420. The Y-plane
// will be scaled directly to the I420 destination, which makes this faster
// than separate NV12->I420 + I420->I420 scaling.
class RTC_EXPORT NV12ToI420Scaler {
 public:
  NV12ToI420Scaler();
  ~NV12ToI420Scaler();
  void NV12ToI420Scale(const uint8_t* src_y,
                       int src_stride_y,
                       const uint8_t* src_uv,
                       int src_stride_uv,
                       int src_width,
                       int src_height,
                       uint8_t* dst_y,
                       int dst_stride_y,
                       uint8_t* dst_u,
                       int dst_stride_u,
                       uint8_t* dst_v,
                       int dst_stride_v,
                       int dst_width,
                       int dst_height);

 private:
  std::vector<uint8_t> tmp_uv_planes_;
};

// Convert VideoType to libyuv FourCC type
int ConvertVideoType(VideoType video_type);

}  // namespace webrtc

#endif  // COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_