text: /*
   *  Copyright 2011 The LibYuv 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 <stdlib.h>
  
  #include "convert.h"
  
  #include "video_common.h"
  
  #ifdef __cplusplus
  namespace libyuv {
  extern "C" {
  #endif
  
  // Convert camera sample to I420 with cropping, rotation and vertical flip.
  // src_width is used for source stride computation
  // src_height is used to compute location of planes, and indicate inversion
  // sample_size is measured in bytes and is the size of the frame.
  //   With MJPEG it is the compressed size of the frame.
  LIBYUV_API
  int ConvertToI420(const uint8* sample,
                    size_t sample_size,
                    uint8* y, int y_stride,
                    uint8* u, int u_stride,
                    uint8* v, int v_stride,
                    int crop_x, int crop_y,
                    int src_width, int src_height,
                    int crop_width, int crop_height,
                    enum RotationMode rotation,
                    uint32 fourcc) {
    uint32 format = CanonicalFourCC(fourcc);
    int aligned_src_width = (src_width + 1) & ~1;
    const uint8* src;
    const uint8* src_uv;
    const int abs_src_height = (src_height < 0) ? -src_height : src_height;
    // TODO(nisse): Why allow crop_height < 0?
    const int abs_crop_height = (crop_height < 0) ? -crop_height : crop_height;
    int r = 0;
    LIBYUV_BOOL need_buf = (rotation && format != FOURCC_I420 &&
        format != FOURCC_NV12 && format != FOURCC_NV21 &&
        format != FOURCC_YV12) || y == sample;
    uint8* tmp_y = y;
    uint8* tmp_u = u;
    uint8* tmp_v = v;
    int tmp_y_stride = y_stride;
    int tmp_u_stride = u_stride;
    int tmp_v_stride = v_stride;
    uint8* rotate_buffer = NULL;
    const int inv_crop_height =
        (src_height < 0) ? -abs_crop_height : abs_crop_height;
  
    if (!y || !u || !v || !sample ||
        src_width <= 0 || crop_width <= 0  ||
        src_height == 0 || crop_height == 0) {
      return -1;
    }
  
    // One pass rotation is available for some formats. For the rest, convert
    // to I420 (with optional vertical flipping) into a temporary I420 buffer,
    // and then rotate the I420 to the final destination buffer.
    // For in-place conversion, if destination y is same as source sample,
    // also enable temporary buffer.
    if (need_buf) {
      int y_size = crop_width * abs_crop_height;
      int uv_size = ((crop_width + 1) / 2) * ((abs_crop_height + 1) / 2);
      rotate_buffer = (uint8*)malloc(y_size + uv_size * 2);  /* NOLINT */
      if (!rotate_buffer) {
        return 1;  // Out of memory runtime error.
      }
      y = rotate_buffer;
      u = y + y_size;
      v = u + uv_size;
      y_stride = crop_width;
      u_stride = v_stride = ((crop_width + 1) / 2);
    }
  
    switch (format) {
      // Single plane formats
      case FOURCC_YUY2:
        src = sample + (aligned_src_width * crop_y + crop_x) * 2;
        r = YUY2ToI420(src, aligned_src_width * 2,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_UYVY:
        src = sample + (aligned_src_width * crop_y + crop_x) * 2;
        r = UYVYToI420(src, aligned_src_width * 2,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_RGBP:
        src = sample + (src_width * crop_y + crop_x) * 2;
        r = RGB565ToI420(src, src_width * 2,
                         y, y_stride,
                         u, u_stride,
                         v, v_stride,
                         crop_width, inv_crop_height);
        break;
      case FOURCC_RGBO:
        src = sample + (src_width * crop_y + crop_x) * 2;
        r = ARGB1555ToI420(src, src_width * 2,
                           y, y_stride,
                           u, u_stride,
                           v, v_stride,
                           crop_width, inv_crop_height);
        break;
      case FOURCC_R444:
        src = sample + (src_width * crop_y + crop_x) * 2;
        r = ARGB4444ToI420(src, src_width * 2,
                           y, y_stride,
                           u, u_stride,
                           v, v_stride,
                           crop_width, inv_crop_height);
        break;
      case FOURCC_24BG:
        src = sample + (src_width * crop_y + crop_x) * 3;
        r = RGB24ToI420(src, src_width * 3,
                        y, y_stride,
                        u, u_stride,
                        v, v_stride,
                        crop_width, inv_crop_height);
        break;
      case FOURCC_RAW:
        src = sample + (src_width * crop_y + crop_x) * 3;
        r = RAWToI420(src, src_width * 3,
                      y, y_stride,
                      u, u_stride,
                      v, v_stride,
                      crop_width, inv_crop_height);
        break;
      case FOURCC_ARGB:
        src = sample + (src_width * crop_y + crop_x) * 4;
        r = ARGBToI420(src, src_width * 4,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_BGRA:
        src = sample + (src_width * crop_y + crop_x) * 4;
        r = BGRAToI420(src, src_width * 4,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_ABGR:
        src = sample + (src_width * crop_y + crop_x) * 4;
        r = ABGRToI420(src, src_width * 4,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_RGBA:
        src = sample + (src_width * crop_y + crop_x) * 4;
        r = RGBAToI420(src, src_width * 4,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      case FOURCC_I400:
        src = sample + src_width * crop_y + crop_x;
        r = I400ToI420(src, src_width,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      // Biplanar formats
      case FOURCC_NV12:
        src = sample + (src_width * crop_y + crop_x);
        src_uv = sample + (src_width * src_height) +
          ((crop_y / 2) * aligned_src_width) + ((crop_x / 2) * 2);
        r = NV12ToI420Rotate(src, src_width,
                             src_uv, aligned_src_width,
                             y, y_stride,
                             u, u_stride,
                             v, v_stride,
                             crop_width, inv_crop_height, rotation);
        break;
      case FOURCC_NV21:
        src = sample + (src_width * crop_y + crop_x);
        src_uv = sample + (src_width * src_height) +
          ((crop_y / 2) * aligned_src_width) + ((crop_x / 2) * 2);
        // Call NV12 but with u and v parameters swapped.
        r = NV12ToI420Rotate(src, src_width,
                             src_uv, aligned_src_width,
                             y, y_stride,
                             v, v_stride,
                             u, u_stride,
                             crop_width, inv_crop_height, rotation);
        break;
      case FOURCC_M420:
        src = sample + (src_width * crop_y) * 12 / 8 + crop_x;
        r = M420ToI420(src, src_width,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      // Triplanar formats
      case FOURCC_I420:
      case FOURCC_YV12: {
        const uint8* src_y = sample + (src_width * crop_y + crop_x);
        const uint8* src_u;
        const uint8* src_v;
        int halfwidth = (src_width + 1) / 2;
        int halfheight = (abs_src_height + 1) / 2;
        if (format == FOURCC_YV12) {
          src_v = sample + src_width * abs_src_height +
              (halfwidth * crop_y + crop_x) / 2;
          src_u = sample + src_width * abs_src_height +
              halfwidth * (halfheight + crop_y / 2) + crop_x / 2;
        } else {
          src_u = sample + src_width * abs_src_height +
              (halfwidth * crop_y + crop_x) / 2;
          src_v = sample + src_width * abs_src_height +
              halfwidth * (halfheight + crop_y / 2) + crop_x / 2;
        }
        r = I420Rotate(src_y, src_width,
                       src_u, halfwidth,
                       src_v, halfwidth,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height, rotation);
        break;
      }
      case FOURCC_I422:
      case FOURCC_YV16: {
        const uint8* src_y = sample + src_width * crop_y + crop_x;
        const uint8* src_u;
        const uint8* src_v;
        int halfwidth = (src_width + 1) / 2;
        if (format == FOURCC_YV16) {
          src_v = sample + src_width * abs_src_height +
              halfwidth * crop_y + crop_x / 2;
          src_u = sample + src_width * abs_src_height +
              halfwidth * (abs_src_height + crop_y) + crop_x / 2;
        } else {
          src_u = sample + src_width * abs_src_height +
              halfwidth * crop_y + crop_x / 2;
          src_v = sample + src_width * abs_src_height +
              halfwidth * (abs_src_height + crop_y) + crop_x / 2;
        }
        r = I422ToI420(src_y, src_width,
                       src_u, halfwidth,
                       src_v, halfwidth,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      }
      case FOURCC_I444:
      case FOURCC_YV24: {
        const uint8* src_y = sample + src_width * crop_y + crop_x;
        const uint8* src_u;
        const uint8* src_v;
        if (format == FOURCC_YV24) {
          src_v = sample + src_width * (abs_src_height + crop_y) + crop_x;
          src_u = sample + src_width * (abs_src_height * 2 + crop_y) + crop_x;
        } else {
          src_u = sample + src_width * (abs_src_height + crop_y) + crop_x;
          src_v = sample + src_width * (abs_src_height * 2 + crop_y) + crop_x;
        }
        r = I444ToI420(src_y, src_width,
                       src_u, src_width,
                       src_v, src_width,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       crop_width, inv_crop_height);
        break;
      }
  #ifdef HAVE_JPEG
      case FOURCC_MJPG:
        r = MJPGToI420(sample, sample_size,
                       y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       src_width, abs_src_height, crop_width, inv_crop_height);
        break;
  #endif
      default:
        r = -1;  // unknown fourcc - return failure code.
    }
  
    if (need_buf) {
      if (!r) {
        r = I420Rotate(y, y_stride,
                       u, u_stride,
                       v, v_stride,
                       tmp_y, tmp_y_stride,
                       tmp_u, tmp_u_stride,
                       tmp_v, tmp_v_stride,
                       crop_width, abs_crop_height, rotation);
      }
      free(rotate_buffer);
    }
  
    return r;
  }
  
  #ifdef __cplusplus
  }  // extern "C"
  }  // namespace libyuv
  #endif
  