1 /*
2 * Constants for DV codec
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 /**
23 * @file
24 * Constants for DV codec.
25 */
26
27 #ifndef AVCODEC_DV_H
28 #define AVCODEC_DV_H
29
30 #include "avcodec.h"
31 #include "dv_profile.h"
32 #include "me_cmp.h"
33 #include "vlc.h"
34 #include "idctdsp.h"
35
36 typedef struct DVwork_chunk {
37 uint16_t buf_offset;
38 uint16_t mb_coordinates[5];
39 } DVwork_chunk;
40
41 typedef struct DVVideoContext {
42 AVClass *avclass;
43 const AVDVProfile *sys;
44 const AVFrame *frame;
45 AVCodecContext *avctx;
46 uint8_t *buf;
47
48 uint8_t dv_zigzag[2][64];
49
50 void (*get_pixels)(int16_t *block, const uint8_t *pixels, ptrdiff_t linesize);
51 void (*fdct[2])(int16_t *block);
52 void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block);
53 me_cmp_func ildct_cmp;
54 DVwork_chunk work_chunks[4 * 12 * 27];
55 uint32_t idct_factor[2 * 4 * 16 * 64];
56 IDCTDSPContext idsp;
57
58 int quant_deadzone;
59 } DVVideoContext;
60
61 enum dv_section_type {
62 dv_sect_header = 0x1f,
63 dv_sect_subcode = 0x3f,
64 dv_sect_vaux = 0x56,
65 dv_sect_audio = 0x76,
66 dv_sect_video = 0x96,
67 };
68
69 enum dv_pack_type {
70 dv_header525 = 0x3f, /* see dv_write_pack for important details on */
71 dv_header625 = 0xbf, /* these two packs */
72 dv_timecode = 0x13,
73 dv_audio_source = 0x50,
74 dv_audio_control = 0x51,
75 dv_audio_recdate = 0x52,
76 dv_audio_rectime = 0x53,
77 dv_video_source = 0x60,
78 dv_video_control = 0x61,
79 dv_video_recdate = 0x62,
80 dv_video_rectime = 0x63,
81 dv_unknown_pack = 0xff,
82 };
83
84 #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
85 #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
86 #define DV_PROFILE_IS_1080i60(p) (((p)->video_stype == 0x14) && ((p)->dsf == 0))
87 #define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
88
89 /**
90 * largest possible DV frame, in bytes (1080i50)
91 */
92 #define DV_MAX_FRAME_SIZE 576000
93
94 /**
95 * maximum number of blocks per macroblock in any DV format
96 */
97 #define DV_MAX_BPM 8
98
99 #define TEX_VLC_BITS 10
100
101 extern RL_VLC_ELEM ff_dv_rl_vlc[1664];
102
103 int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);
104
105 int ff_dvvideo_init(AVCodecContext *avctx);
106
dv_work_pool_size(const AVDVProfile * d)107 static inline int dv_work_pool_size(const AVDVProfile *d)
108 {
109 int size = d->n_difchan * d->difseg_size * 27;
110 if (DV_PROFILE_IS_1080i50(d))
111 size -= 3 * 27;
112 if (DV_PROFILE_IS_720p50(d))
113 size -= 4 * 27;
114 return size;
115 }
116
dv_calculate_mb_xy(DVVideoContext * s,DVwork_chunk * work_chunk,int m,int * mb_x,int * mb_y)117 static inline void dv_calculate_mb_xy(DVVideoContext *s,
118 DVwork_chunk *work_chunk,
119 int m, int *mb_x, int *mb_y)
120 {
121 *mb_x = work_chunk->mb_coordinates[m] & 0xff;
122 *mb_y = work_chunk->mb_coordinates[m] >> 8;
123
124 /* We work with 720p frames split in half.
125 * The odd half-frame (chan == 2,3) is displaced :-( */
126 if (s->sys->height == 720 && !(s->buf[1] & 0x0C))
127 /* shifting the Y coordinate down by 72/2 macro blocks */
128 *mb_y -= (*mb_y > 17) ? 18 : -72;
129 }
130
131 #endif /* AVCODEC_DV_H */
132