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/*
* DV encoder/decoder shared code
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DV_INTERNAL_H
#define AVCODEC_DV_INTERNAL_H
#include <stdint.h>
#include "dv.h"
#include "dv_profile.h"
typedef struct DVwork_chunk {
uint16_t buf_offset;
uint16_t mb_coordinates[5];
} DVwork_chunk;
void ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d);
static inline int dv_work_pool_size(const AVDVProfile *d)
{
int size = d->n_difchan * d->difseg_size * 27;
if (DV_PROFILE_IS_1080i50(d))
size -= 3 * 27;
if (DV_PROFILE_IS_720p50(d))
size -= 4 * 27;
return size;
}
static inline void dv_calculate_mb_xy(const AVDVProfile *sys,
const uint8_t *buf,
const DVwork_chunk *work_chunk,
int m, int *mb_x, int *mb_y)
{
*mb_x = work_chunk->mb_coordinates[m] & 0xff;
*mb_y = work_chunk->mb_coordinates[m] >> 8;
/* We work with 720p frames split in half.
* The odd half-frame (chan == 2,3) is displaced :-( */
if (sys->height == 720 && !(buf[1] & 0x0C))
/* shifting the Y coordinate down by 72/2 macro blocks */
*mb_y -= (*mb_y > 17) ? 18 : -72;
}
#endif // AVCODEC_DV_INTERNAL_H
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