text: /*
   *  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.
   */
  
  #ifndef VPX_SCALE_YV12CONFIG_H_
  #define VPX_SCALE_YV12CONFIG_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include "vpx/vpx_frame_buffer.h"
  #include "vpx/vpx_integer.h"
  
  #define VP8BORDERINPIXELS           32
  #define VP9INNERBORDERINPIXELS      96
  #define VP9_INTERP_EXTEND           4
  #define VP9_ENC_BORDER_IN_PIXELS    160
  #define VP9_DEC_BORDER_IN_PIXELS    32
  
  typedef struct yv12_buffer_config {
    int   y_width;
    int   y_height;
    int   y_crop_width;
    int   y_crop_height;
    int   y_stride;
  
    int   uv_width;
    int   uv_height;
    int   uv_crop_width;
    int   uv_crop_height;
    int   uv_stride;
  
    int   alpha_width;
    int   alpha_height;
    int   alpha_stride;
  
    uint8_t *y_buffer;
    uint8_t *u_buffer;
    uint8_t *v_buffer;
    uint8_t *alpha_buffer;
  
    uint8_t *buffer_alloc;
    int buffer_alloc_sz;
    int border;
    int frame_size;
  
    int corrupted;
    int flags;
  } YV12_BUFFER_CONFIG;
  
  int vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                                  int width, int height, int border);
  int vp8_yv12_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                                    int width, int height, int border);
  int vp8_yv12_de_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf);
  
  int vp9_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                             int width, int height, int ss_x, int ss_y,
                             int border);
  
  // Updates the yv12 buffer config with the frame buffer. If cb is not
  // NULL, then libvpx is using the frame buffer callbacks to handle memory.
  // If cb is not NULL, libvpx will call cb with minimum size in bytes needed
  // to decode the current frame. If cb is NULL, libvpx will allocate memory
  // internally to decode the current frame. Returns 0 on success. Returns < 0
  // on failure.
  int vp9_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                               int width, int height, int ss_x, int ss_y,
                               int border,
                               vpx_codec_frame_buffer_t *fb,
                               vpx_get_frame_buffer_cb_fn_t cb,
                               void *cb_priv);
  int vp9_free_frame_buffer(YV12_BUFFER_CONFIG *ybf);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif  // VPX_SCALE_YV12CONFIG_H_
  