FFmpeg
dv_internal.h
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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 int 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;
41  size -= 3 * 27;
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
DVwork_chunk::buf_offset
uint16_t buf_offset
Definition: dv_internal.h:31
DVwork_chunk
Definition: dv_internal.h:30
dv_profile.h
dv_work_pool_size
static int dv_work_pool_size(const AVDVProfile *d)
Definition: dv_internal.h:37
DV_PROFILE_IS_1080i50
#define DV_PROFILE_IS_1080i50(p)
Definition: dv.h:54
dv_calculate_mb_xy
static 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)
Definition: dv_internal.h:47
DV_PROFILE_IS_720p50
#define DV_PROFILE_IS_720p50(p)
Definition: dv.h:56
dv.h
size
int size
Definition: twinvq_data.h:10344
AVDVProfile::height
int height
Definition: dv_profile.h:46
DVwork_chunk::mb_coordinates
uint16_t mb_coordinates[5]
Definition: dv_internal.h:32
AVDVProfile
Definition: dv_profile.h:38
d
d
Definition: ffmpeg_filter.c:424
ff_dv_init_dynamic_tables
int ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
Definition: dv.c:169