libavcodec/dv_internal.h

   1 /*
   2  * DV encoder/decoder shared code
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef AVCODEC_DV_INTERNAL_H
  23 #define AVCODEC_DV_INTERNAL_H
  24
  25 #include <stdint.h>
  26
  27 #include "dv.h"
  28 #include "dv_profile.h"
  29
  30 typedef struct DVwork_chunk {
  31     uint16_t buf_offset;
  32     uint16_t mb_coordinates[5];
  33 } DVwork_chunk;
  34
  35 void ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d);
  36
  37 static inline int dv_work_pool_size(const AVDVProfile *d)
  38 {
  39     int size = d->n_difchan * d->difseg_size * 27;
  40     if (DV_PROFILE_IS_1080i50(d))
  41         size -= 3 * 27;
  42     if (DV_PROFILE_IS_720p50(d))
  43         size -= 4 * 27;
  44     return size;
  45 }
  46
  47 static inline void dv_calculate_mb_xy(const AVDVProfile *sys,
  48                                       const uint8_t *buf,
  49                                       const DVwork_chunk *work_chunk,
  50                                       int m, int *mb_x, int *mb_y)
  51 {
  52     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
  53     *mb_y = work_chunk->mb_coordinates[m] >> 8;
  54
  55     /* We work with 720p frames split in half.
  56      * The odd half-frame (chan == 2,3) is displaced :-( */
  57     if (sys->height == 720 && !(buf[1] & 0x0C))
  58         /* shifting the Y coordinate down by 72/2 macro blocks */
  59         *mb_y -= (*mb_y > 17) ? 18 : -72;
  60 }
  61
  62 #endif // AVCODEC_DV_INTERNAL_H