convert_to_i420.cc

/*
 *  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 "libyuv/convert.h"

#include "libyuv/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;
  int abs_src_height = (src_height < 0) ? -src_height : src_height;
  int inv_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_YU12 && 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;
  int abs_crop_height = (crop_height < 0) ? -crop_height : crop_height;

  if (!y || !u || !v || !sample ||
      src_width <= 0 || crop_width <= 0  ||
      src_height == 0 || crop_height == 0) {
    return -1;
  }
  if (src_height < 0) {
    inv_crop_height = -inv_crop_height;
  }

  // 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);
    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_YU12:
    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;
    }
    case FOURCC_I411: {
      int quarterwidth = (src_width + 3) / 4;
      const uint8* src_y = sample + src_width * crop_y + crop_x;
      const uint8* src_u = sample + src_width * abs_src_height +
          quarterwidth * crop_y + crop_x / 4;
      const uint8* src_v = sample + src_width * abs_src_height +
          quarterwidth * (abs_src_height + crop_y) + crop_x / 4;
      r = I411ToI420(src_y, src_width,
                     src_u, quarterwidth,
                     src_v, quarterwidth,
                     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