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