| /* | |
| * 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 | |
| */ | |
| typedef struct DVwork_chunk { | |
| uint16_t buf_offset; | |
| uint16_t mb_coordinates[5]; | |
| } DVwork_chunk; | |
| int 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; | |
| } | |