/*
 *  Copyright (c) 2010 The WebM 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 <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "./tools_common.h"

#if CONFIG_VP8_ENCODER || CONFIG_VP9_ENCODER
#include "vpx/vp8cx.h"
#endif

#if CONFIG_VP8_DECODER || CONFIG_VP9_DECODER
#include "vpx/vp8dx.h"
#endif

#include "vpx/vpx_codec.h"

#if defined(_WIN32) || defined(__OS2__)
#include <io.h>
#include <fcntl.h>

#ifdef __OS2__
#define _setmode setmode
#define _fileno fileno
#define _O_BINARY O_BINARY
#endif
#endif

#define LOG_ERROR(label)               \
  do {                                 \
    const char *l = label;             \
    va_list ap;                        \
    va_start(ap, fmt);                 \
    if (l) fprintf(stderr, "%s: ", l); \
    vfprintf(stderr, fmt, ap);         \
    fprintf(stderr, "\n");             \
    va_end(ap);                        \
  } while (0)

#if CONFIG_ENCODERS
/* Swallow warnings about unused results of fread/fwrite */
static size_t wrap_fread(void *ptr, size_t size, size_t nmemb, FILE *stream) {
  return fread(ptr, size, nmemb, stream);
}
#define fread wrap_fread
#endif

FILE *set_binary_mode(FILE *stream) {
  (void)stream;
#if defined(_WIN32) || defined(__OS2__)
  _setmode(_fileno(stream), _O_BINARY);
#endif
  return stream;
}

void die(const char *fmt, ...) {
  LOG_ERROR(NULL);
  usage_exit();
}

void fatal(const char *fmt, ...) {
  LOG_ERROR("Fatal");
  exit(EXIT_FAILURE);
}

void warn(const char *fmt, ...) { LOG_ERROR("Warning"); }

void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
  const char *detail = vpx_codec_error_detail(ctx);

  fprintf(stderr, "%s: %s\n", s, vpx_codec_error(ctx));
  if (detail) fprintf(stderr, "    %s\n", detail);
  exit(EXIT_FAILURE);
}

int read_yuv_frame(struct VpxInputContext *input_ctx, vpx_image_t *yuv_frame) {
  FILE *f = input_ctx->file;
  struct FileTypeDetectionBuffer *detect = &input_ctx->detect;
  int plane = 0;
  int shortread = 0;
  const int bytespp = (yuv_frame->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;

  for (plane = 0; plane < 3; ++plane) {
    uint8_t *ptr;
    int w = vpx_img_plane_width(yuv_frame, plane);
    const int h = vpx_img_plane_height(yuv_frame, plane);
    int r;
    // Assuming that for nv12 we read all chroma data at one time
    if (yuv_frame->fmt == VPX_IMG_FMT_NV12 && plane > 1) break;
    // Fixing NV12 chroma width it is odd
    if (yuv_frame->fmt == VPX_IMG_FMT_NV12 && plane == 1) w = (w + 1) & ~1;
    /* Determine the correct plane based on the image format. The for-loop
     * always counts in Y,U,V order, but this may not match the order of
     * the data on disk.
     */
    switch (plane) {
      case 1:
        ptr =
            yuv_frame->planes[yuv_frame->fmt == VPX_IMG_FMT_YV12 ? VPX_PLANE_V
                                                                 : VPX_PLANE_U];
        break;
      case 2:
        ptr =
            yuv_frame->planes[yuv_frame->fmt == VPX_IMG_FMT_YV12 ? VPX_PLANE_U
                                                                 : VPX_PLANE_V];
        break;
      default: ptr = yuv_frame->planes[plane];
    }

    for (r = 0; r < h; ++r) {
      size_t needed = w * bytespp;
      size_t buf_position = 0;
      const size_t left = detect->buf_read - detect->position;
      if (left > 0) {
        const size_t more = (left < needed) ? left : needed;
        memcpy(ptr, detect->buf + detect->position, more);
        buf_position = more;
        needed -= more;
        detect->position += more;
      }
      if (needed > 0) {
        shortread |= (fread(ptr + buf_position, 1, needed, f) < needed);
      }

      ptr += yuv_frame->stride[plane];
    }
  }

  return shortread;
}

#if CONFIG_ENCODERS

static const VpxInterface vpx_encoders[] = {
#if CONFIG_VP8_ENCODER
  { "vp8", VP8_FOURCC, &vpx_codec_vp8_cx },
#endif

#if CONFIG_VP9_ENCODER
  { "vp9", VP9_FOURCC, &vpx_codec_vp9_cx },
#endif
};

int get_vpx_encoder_count(void) {
  return sizeof(vpx_encoders) / sizeof(vpx_encoders[0]);
}

const VpxInterface *get_vpx_encoder_by_index(int i) { return &vpx_encoders[i]; }

const VpxInterface *get_vpx_encoder_by_name(const char *name) {
  int i;

  for (i = 0; i < get_vpx_encoder_count(); ++i) {
    const VpxInterface *encoder = get_vpx_encoder_by_index(i);
    if (strcmp(encoder->name, name) == 0) return encoder;
  }

  return NULL;
}

#endif  // CONFIG_ENCODERS

#if CONFIG_DECODERS

static const VpxInterface vpx_decoders[] = {
#if CONFIG_VP8_DECODER
  { "vp8", VP8_FOURCC, &vpx_codec_vp8_dx },
#endif

#if CONFIG_VP9_DECODER
  { "vp9", VP9_FOURCC, &vpx_codec_vp9_dx },
#endif
};

int get_vpx_decoder_count(void) {
  return sizeof(vpx_decoders) / sizeof(vpx_decoders[0]);
}

const VpxInterface *get_vpx_decoder_by_index(int i) { return &vpx_decoders[i]; }

const VpxInterface *get_vpx_decoder_by_name(const char *name) {
  int i;

  for (i = 0; i < get_vpx_decoder_count(); ++i) {
    const VpxInterface *const decoder = get_vpx_decoder_by_index(i);
    if (strcmp(decoder->name, name) == 0) return decoder;
  }

  return NULL;
}

const VpxInterface *get_vpx_decoder_by_fourcc(uint32_t fourcc) {
  int i;

  for (i = 0; i < get_vpx_decoder_count(); ++i) {
    const VpxInterface *const decoder = get_vpx_decoder_by_index(i);
    if (decoder->fourcc == fourcc) return decoder;
  }

  return NULL;
}

#endif  // CONFIG_DECODERS

int vpx_img_plane_width(const vpx_image_t *img, int plane) {
  if (plane > 0 && img->x_chroma_shift > 0)
    return (img->d_w + 1) >> img->x_chroma_shift;
  else
    return img->d_w;
}

int vpx_img_plane_height(const vpx_image_t *img, int plane) {
  if (plane > 0 && img->y_chroma_shift > 0)
    return (img->d_h + 1) >> img->y_chroma_shift;
  else
    return img->d_h;
}

void vpx_img_write(const vpx_image_t *img, FILE *file) {
  int plane;

  for (plane = 0; plane < 3; ++plane) {
    const unsigned char *buf = img->planes[plane];
    const int stride = img->stride[plane];
    const int w = vpx_img_plane_width(img, plane) *
                  ((img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1);
    const int h = vpx_img_plane_height(img, plane);
    int y;

    for (y = 0; y < h; ++y) {
      fwrite(buf, 1, w, file);
      buf += stride;
    }
  }
}

int vpx_img_read(vpx_image_t *img, FILE *file) {
  int plane;

  for (plane = 0; plane < 3; ++plane) {
    unsigned char *buf = img->planes[plane];
    const int stride = img->stride[plane];
    const int w = vpx_img_plane_width(img, plane) *
                  ((img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1);
    const int h = vpx_img_plane_height(img, plane);
    int y;

    for (y = 0; y < h; ++y) {
      if (fread(buf, 1, w, file) != (size_t)w) return 0;
      buf += stride;
    }
  }

  return 1;
}

// TODO(dkovalev) change sse_to_psnr signature: double -> int64_t
double sse_to_psnr(double samples, double peak, double sse) {
  static const double kMaxPSNR = 100.0;

  if (sse > 0.0) {
    const double psnr = 10.0 * log10(samples * peak * peak / sse);
    return psnr > kMaxPSNR ? kMaxPSNR : psnr;
  } else {
    return kMaxPSNR;
  }
}

#if CONFIG_ENCODERS
int read_frame(struct VpxInputContext *input_ctx, vpx_image_t *img) {
  FILE *f = input_ctx->file;
  y4m_input *y4m = &input_ctx->y4m;
  int shortread = 0;

  if (input_ctx->file_type == FILE_TYPE_Y4M) {
    if (y4m_input_fetch_frame(y4m, f, img) < 1) return 0;
  } else {
    shortread = read_yuv_frame(input_ctx, img);
  }

  return !shortread;
}

int file_is_y4m(const char detect[4]) {
  if (memcmp(detect, "YUV4", 4) == 0) {
    return 1;
  }
  return 0;
}

int fourcc_is_ivf(const char detect[4]) {
  if (memcmp(detect, "DKIF", 4) == 0) {
    return 1;
  }
  return 0;
}

void open_input_file(struct VpxInputContext *input) {
  /* Parse certain options from the input file, if possible */
  input->file = strcmp(input->filename, "-") ? fopen(input->filename, "rb")
                                             : set_binary_mode(stdin);

  if (!input->file) fatal("Failed to open input file");

  if (!fseeko(input->file, 0, SEEK_END)) {
    /* Input file is seekable. Figure out how long it is, so we can get
     * progress info.
     */
    input->length = ftello(input->file);
    rewind(input->file);
  }

  /* Default to 1:1 pixel aspect ratio. */
  input->pixel_aspect_ratio.numerator = 1;
  input->pixel_aspect_ratio.denominator = 1;

  /* For RAW input sources, these bytes will applied on the first frame
   *  in read_frame().
   */
  input->detect.buf_read = fread(input->detect.buf, 1, 4, input->file);
  input->detect.position = 0;

  if (input->detect.buf_read == 4 && file_is_y4m(input->detect.buf)) {
    if (y4m_input_open(&input->y4m, input->file, input->detect.buf, 4,
                       input->only_i420) >= 0) {
      input->file_type = FILE_TYPE_Y4M;
      input->width = input->y4m.pic_w;
      input->height = input->y4m.pic_h;
      input->pixel_aspect_ratio.numerator = input->y4m.par_n;
      input->pixel_aspect_ratio.denominator = input->y4m.par_d;
      input->framerate.numerator = input->y4m.fps_n;
      input->framerate.denominator = input->y4m.fps_d;
      input->fmt = input->y4m.vpx_fmt;
      input->bit_depth = input->y4m.bit_depth;
    } else {
      fatal("Unsupported Y4M stream.");
    }
  } else if (input->detect.buf_read == 4 && fourcc_is_ivf(input->detect.buf)) {
    fatal("IVF is not supported as input.");
  } else {
    input->file_type = FILE_TYPE_RAW;
  }
}

void close_input_file(struct VpxInputContext *input) {
  fclose(input->file);
  if (input->file_type == FILE_TYPE_Y4M) y4m_input_close(&input->y4m);
}
#endif

// TODO(debargha): Consolidate the functions below into a separate file.
#if CONFIG_VP9_HIGHBITDEPTH
static void highbd_img_upshift(vpx_image_t *dst, vpx_image_t *src,
                               int input_shift) {
  // Note the offset is 1 less than half.
  const int offset = input_shift > 0 ? (1 << (input_shift - 1)) - 1 : 0;
  int plane;
  if (dst->d_w != src->d_w || dst->d_h != src->d_h ||
      dst->x_chroma_shift != src->x_chroma_shift ||
      dst->y_chroma_shift != src->y_chroma_shift || dst->fmt != src->fmt ||
      input_shift < 0) {
    fatal("Unsupported image conversion");
  }
  switch (src->fmt) {
    case VPX_IMG_FMT_I42016:
    case VPX_IMG_FMT_I42216:
    case VPX_IMG_FMT_I44416:
    case VPX_IMG_FMT_I44016: break;
    default: fatal("Unsupported image conversion");
  }
  for (plane = 0; plane < 3; plane++) {
    int w = src->d_w;
    int h = src->d_h;
    int x, y;
    if (plane) {
      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
    }
    for (y = 0; y < h; y++) {
      uint16_t *p_src =
          (uint16_t *)(src->planes[plane] + y * src->stride[plane]);
      uint16_t *p_dst =
          (uint16_t *)(dst->planes[plane] + y * dst->stride[plane]);
      for (x = 0; x < w; x++) *p_dst++ = (*p_src++ << input_shift) + offset;
    }
  }
}

static void lowbd_img_upshift(vpx_image_t *dst, vpx_image_t *src,
                              int input_shift) {
  // Note the offset is 1 less than half.
  const int offset = input_shift > 0 ? (1 << (input_shift - 1)) - 1 : 0;
  int plane;
  if (dst->d_w != src->d_w || dst->d_h != src->d_h ||
      dst->x_chroma_shift != src->x_chroma_shift ||
      dst->y_chroma_shift != src->y_chroma_shift ||
      dst->fmt != src->fmt + VPX_IMG_FMT_HIGHBITDEPTH || input_shift < 0) {
    fatal("Unsupported image conversion");
  }
  switch (src->fmt) {
    case VPX_IMG_FMT_I420:
    case VPX_IMG_FMT_I422:
    case VPX_IMG_FMT_I444:
    case VPX_IMG_FMT_I440: break;
    default: fatal("Unsupported image conversion");
  }
  for (plane = 0; plane < 3; plane++) {
    int w = src->d_w;
    int h = src->d_h;
    int x, y;
    if (plane) {
      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
    }
    for (y = 0; y < h; y++) {
      uint8_t *p_src = src->planes[plane] + y * src->stride[plane];
      uint16_t *p_dst =
          (uint16_t *)(dst->planes[plane] + y * dst->stride[plane]);
      for (x = 0; x < w; x++) {
        *p_dst++ = (*p_src++ << input_shift) + offset;
      }
    }
  }
}

void vpx_img_upshift(vpx_image_t *dst, vpx_image_t *src, int input_shift) {
  if (src->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
    highbd_img_upshift(dst, src, input_shift);
  } else {
    lowbd_img_upshift(dst, src, input_shift);
  }
}

void vpx_img_truncate_16_to_8(vpx_image_t *dst, vpx_image_t *src) {
  int plane;
  if (dst->fmt + VPX_IMG_FMT_HIGHBITDEPTH != src->fmt || dst->d_w != src->d_w ||
      dst->d_h != src->d_h || dst->x_chroma_shift != src->x_chroma_shift ||
      dst->y_chroma_shift != src->y_chroma_shift) {
    fatal("Unsupported image conversion");
  }
  switch (dst->fmt) {
    case VPX_IMG_FMT_I420:
    case VPX_IMG_FMT_I422:
    case VPX_IMG_FMT_I444:
    case VPX_IMG_FMT_I440: break;
    default: fatal("Unsupported image conversion");
  }
  for (plane = 0; plane < 3; plane++) {
    int w = src->d_w;
    int h = src->d_h;
    int x, y;
    if (plane) {
      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
    }
    for (y = 0; y < h; y++) {
      uint16_t *p_src =
          (uint16_t *)(src->planes[plane] + y * src->stride[plane]);
      uint8_t *p_dst = dst->planes[plane] + y * dst->stride[plane];
      for (x = 0; x < w; x++) {
        *p_dst++ = (uint8_t)(*p_src++);
      }
    }
  }
}

static void highbd_img_downshift(vpx_image_t *dst, vpx_image_t *src,
                                 int down_shift) {
  int plane;
  if (dst->d_w != src->d_w || dst->d_h != src->d_h ||
      dst->x_chroma_shift != src->x_chroma_shift ||
      dst->y_chroma_shift != src->y_chroma_shift || dst->fmt != src->fmt ||
      down_shift < 0) {
    fatal("Unsupported image conversion");
  }
  switch (src->fmt) {
    case VPX_IMG_FMT_I42016:
    case VPX_IMG_FMT_I42216:
    case VPX_IMG_FMT_I44416:
    case VPX_IMG_FMT_I44016: break;
    default: fatal("Unsupported image conversion");
  }
  for (plane = 0; plane < 3; plane++) {
    int w = src->d_w;
    int h = src->d_h;
    int x, y;
    if (plane) {
      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
    }
    for (y = 0; y < h; y++) {
      uint16_t *p_src =
          (uint16_t *)(src->planes[plane] + y * src->stride[plane]);
      uint16_t *p_dst =
          (uint16_t *)(dst->planes[plane] + y * dst->stride[plane]);
      for (x = 0; x < w; x++) *p_dst++ = *p_src++ >> down_shift;
    }
  }
}

static void lowbd_img_downshift(vpx_image_t *dst, vpx_image_t *src,
                                int down_shift) {
  int plane;
  if (dst->d_w != src->d_w || dst->d_h != src->d_h ||
      dst->x_chroma_shift != src->x_chroma_shift ||
      dst->y_chroma_shift != src->y_chroma_shift ||
      src->fmt != dst->fmt + VPX_IMG_FMT_HIGHBITDEPTH || down_shift < 0) {
    fatal("Unsupported image conversion");
  }
  switch (dst->fmt) {
    case VPX_IMG_FMT_I420:
    case VPX_IMG_FMT_I422:
    case VPX_IMG_FMT_I444:
    case VPX_IMG_FMT_I440: break;
    default: fatal("Unsupported image conversion");
  }
  for (plane = 0; plane < 3; plane++) {
    int w = src->d_w;
    int h = src->d_h;
    int x, y;
    if (plane) {
      w = (w + src->x_chroma_shift) >> src->x_chroma_shift;
      h = (h + src->y_chroma_shift) >> src->y_chroma_shift;
    }
    for (y = 0; y < h; y++) {
      uint16_t *p_src =
          (uint16_t *)(src->planes[plane] + y * src->stride[plane]);
      uint8_t *p_dst = dst->planes[plane] + y * dst->stride[plane];
      for (x = 0; x < w; x++) {
        *p_dst++ = *p_src++ >> down_shift;
      }
    }
  }
}

void vpx_img_downshift(vpx_image_t *dst, vpx_image_t *src, int down_shift) {
  if (dst->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
    highbd_img_downshift(dst, src, down_shift);
  } else {
    lowbd_img_downshift(dst, src, down_shift);
  }
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

int compare_img(const vpx_image_t *const img1, const vpx_image_t *const img2) {
  uint32_t l_w = img1->d_w;
  uint32_t c_w = (img1->d_w + img1->x_chroma_shift) >> img1->x_chroma_shift;
  const uint32_t c_h =
      (img1->d_h + img1->y_chroma_shift) >> img1->y_chroma_shift;
  uint32_t i;
  int match = 1;

  match &= (img1->fmt == img2->fmt);
  match &= (img1->d_w == img2->d_w);
  match &= (img1->d_h == img2->d_h);
#if CONFIG_VP9_HIGHBITDEPTH
  if (img1->fmt & VPX_IMG_FMT_HIGHBITDEPTH) {
    l_w *= 2;
    c_w *= 2;
  }
#endif

  for (i = 0; i < img1->d_h; ++i)
    match &= (memcmp(img1->planes[VPX_PLANE_Y] + i * img1->stride[VPX_PLANE_Y],
                     img2->planes[VPX_PLANE_Y] + i * img2->stride[VPX_PLANE_Y],
                     l_w) == 0);

  for (i = 0; i < c_h; ++i)
    match &= (memcmp(img1->planes[VPX_PLANE_U] + i * img1->stride[VPX_PLANE_U],
                     img2->planes[VPX_PLANE_U] + i * img2->stride[VPX_PLANE_U],
                     c_w) == 0);

  for (i = 0; i < c_h; ++i)
    match &= (memcmp(img1->planes[VPX_PLANE_V] + i * img1->stride[VPX_PLANE_V],
                     img2->planes[VPX_PLANE_V] + i * img2->stride[VPX_PLANE_V],
                     c_w) == 0);

  return match;
}

#define mmin(a, b) ((a) < (b) ? (a) : (b))

#if CONFIG_VP9_HIGHBITDEPTH
void find_mismatch_high(const vpx_image_t *const img1,
                        const vpx_image_t *const img2, int yloc[4], int uloc[4],
                        int vloc[4]) {
  uint16_t *plane1, *plane2;
  uint32_t stride1, stride2;
  const uint32_t bsize = 64;
  const uint32_t bsizey = bsize >> img1->y_chroma_shift;
  const uint32_t bsizex = bsize >> img1->x_chroma_shift;
  const uint32_t c_w =
      (img1->d_w + img1->x_chroma_shift) >> img1->x_chroma_shift;
  const uint32_t c_h =
      (img1->d_h + img1->y_chroma_shift) >> img1->y_chroma_shift;
  int match = 1;
  uint32_t i, j;
  yloc[0] = yloc[1] = yloc[2] = yloc[3] = -1;
  plane1 = (uint16_t *)img1->planes[VPX_PLANE_Y];
  plane2 = (uint16_t *)img2->planes[VPX_PLANE_Y];
  stride1 = img1->stride[VPX_PLANE_Y] / 2;
  stride2 = img2->stride[VPX_PLANE_Y] / 2;
  for (i = 0, match = 1; match && i < img1->d_h; i += bsize) {
    for (j = 0; match && j < img1->d_w; j += bsize) {
      int k, l;
      const int si = mmin(i + bsize, img1->d_h) - i;
      const int sj = mmin(j + bsize, img1->d_w) - j;
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(plane1 + (i + k) * stride1 + j + l) !=
              *(plane2 + (i + k) * stride2 + j + l)) {
            yloc[0] = i + k;
            yloc[1] = j + l;
            yloc[2] = *(plane1 + (i + k) * stride1 + j + l);
            yloc[3] = *(plane2 + (i + k) * stride2 + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }

  uloc[0] = uloc[1] = uloc[2] = uloc[3] = -1;
  plane1 = (uint16_t *)img1->planes[VPX_PLANE_U];
  plane2 = (uint16_t *)img2->planes[VPX_PLANE_U];
  stride1 = img1->stride[VPX_PLANE_U] / 2;
  stride2 = img2->stride[VPX_PLANE_U] / 2;
  for (i = 0, match = 1; match && i < c_h; i += bsizey) {
    for (j = 0; match && j < c_w; j += bsizex) {
      int k, l;
      const int si = mmin(i + bsizey, c_h - i);
      const int sj = mmin(j + bsizex, c_w - j);
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(plane1 + (i + k) * stride1 + j + l) !=
              *(plane2 + (i + k) * stride2 + j + l)) {
            uloc[0] = i + k;
            uloc[1] = j + l;
            uloc[2] = *(plane1 + (i + k) * stride1 + j + l);
            uloc[3] = *(plane2 + (i + k) * stride2 + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }

  vloc[0] = vloc[1] = vloc[2] = vloc[3] = -1;
  plane1 = (uint16_t *)img1->planes[VPX_PLANE_V];
  plane2 = (uint16_t *)img2->planes[VPX_PLANE_V];
  stride1 = img1->stride[VPX_PLANE_V] / 2;
  stride2 = img2->stride[VPX_PLANE_V] / 2;
  for (i = 0, match = 1; match && i < c_h; i += bsizey) {
    for (j = 0; match && j < c_w; j += bsizex) {
      int k, l;
      const int si = mmin(i + bsizey, c_h - i);
      const int sj = mmin(j + bsizex, c_w - j);
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(plane1 + (i + k) * stride1 + j + l) !=
              *(plane2 + (i + k) * stride2 + j + l)) {
            vloc[0] = i + k;
            vloc[1] = j + l;
            vloc[2] = *(plane1 + (i + k) * stride1 + j + l);
            vloc[3] = *(plane2 + (i + k) * stride2 + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

void find_mismatch(const vpx_image_t *const img1, const vpx_image_t *const img2,
                   int yloc[4], int uloc[4], int vloc[4]) {
  const uint32_t bsize = 64;
  const uint32_t bsizey = bsize >> img1->y_chroma_shift;
  const uint32_t bsizex = bsize >> img1->x_chroma_shift;
  const uint32_t c_w =
      (img1->d_w + img1->x_chroma_shift) >> img1->x_chroma_shift;
  const uint32_t c_h =
      (img1->d_h + img1->y_chroma_shift) >> img1->y_chroma_shift;
  int match = 1;
  uint32_t i, j;
  yloc[0] = yloc[1] = yloc[2] = yloc[3] = -1;
  for (i = 0, match = 1; match && i < img1->d_h; i += bsize) {
    for (j = 0; match && j < img1->d_w; j += bsize) {
      int k, l;
      const int si = mmin(i + bsize, img1->d_h) - i;
      const int sj = mmin(j + bsize, img1->d_w) - j;
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(img1->planes[VPX_PLANE_Y] +
                (i + k) * img1->stride[VPX_PLANE_Y] + j + l) !=
              *(img2->planes[VPX_PLANE_Y] +
                (i + k) * img2->stride[VPX_PLANE_Y] + j + l)) {
            yloc[0] = i + k;
            yloc[1] = j + l;
            yloc[2] = *(img1->planes[VPX_PLANE_Y] +
                        (i + k) * img1->stride[VPX_PLANE_Y] + j + l);
            yloc[3] = *(img2->planes[VPX_PLANE_Y] +
                        (i + k) * img2->stride[VPX_PLANE_Y] + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }

  uloc[0] = uloc[1] = uloc[2] = uloc[3] = -1;
  for (i = 0, match = 1; match && i < c_h; i += bsizey) {
    for (j = 0; match && j < c_w; j += bsizex) {
      int k, l;
      const int si = mmin(i + bsizey, c_h - i);
      const int sj = mmin(j + bsizex, c_w - j);
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(img1->planes[VPX_PLANE_U] +
                (i + k) * img1->stride[VPX_PLANE_U] + j + l) !=
              *(img2->planes[VPX_PLANE_U] +
                (i + k) * img2->stride[VPX_PLANE_U] + j + l)) {
            uloc[0] = i + k;
            uloc[1] = j + l;
            uloc[2] = *(img1->planes[VPX_PLANE_U] +
                        (i + k) * img1->stride[VPX_PLANE_U] + j + l);
            uloc[3] = *(img2->planes[VPX_PLANE_U] +
                        (i + k) * img2->stride[VPX_PLANE_U] + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }
  vloc[0] = vloc[1] = vloc[2] = vloc[3] = -1;
  for (i = 0, match = 1; match && i < c_h; i += bsizey) {
    for (j = 0; match && j < c_w; j += bsizex) {
      int k, l;
      const int si = mmin(i + bsizey, c_h - i);
      const int sj = mmin(j + bsizex, c_w - j);
      for (k = 0; match && k < si; ++k) {
        for (l = 0; match && l < sj; ++l) {
          if (*(img1->planes[VPX_PLANE_V] +
                (i + k) * img1->stride[VPX_PLANE_V] + j + l) !=
              *(img2->planes[VPX_PLANE_V] +
                (i + k) * img2->stride[VPX_PLANE_V] + j + l)) {
            vloc[0] = i + k;
            vloc[1] = j + l;
            vloc[2] = *(img1->planes[VPX_PLANE_V] +
                        (i + k) * img1->stride[VPX_PLANE_V] + j + l);
            vloc[3] = *(img2->planes[VPX_PLANE_V] +
                        (i + k) * img2->stride[VPX_PLANE_V] + j + l);
            match = 0;
            break;
          }
        }
      }
    }
  }
}