blob: 6350a16dfff30f50af9509d2b82e6dd3986c5cbf
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 | |
35 | typedef struct DVwork_chunk { |
36 | uint16_t buf_offset; |
37 | uint16_t mb_coordinates[5]; |
38 | } DVwork_chunk; |
39 | |
40 | typedef struct DVVideoContext { |
41 | const AVDVProfile *sys; |
42 | const AVFrame *frame; |
43 | AVCodecContext *avctx; |
44 | uint8_t *buf; |
45 | |
46 | uint8_t dv_zigzag[2][64]; |
47 | |
48 | void (*get_pixels)(int16_t *block, const uint8_t *pixels, ptrdiff_t linesize); |
49 | void (*fdct[2])(int16_t *block); |
50 | void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block); |
51 | me_cmp_func ildct_cmp; |
52 | DVwork_chunk work_chunks[4 * 12 * 27]; |
53 | uint32_t idct_factor[2 * 4 * 16 * 64]; |
54 | } DVVideoContext; |
55 | |
56 | enum dv_section_type { |
57 | dv_sect_header = 0x1f, |
58 | dv_sect_subcode = 0x3f, |
59 | dv_sect_vaux = 0x56, |
60 | dv_sect_audio = 0x76, |
61 | dv_sect_video = 0x96, |
62 | }; |
63 | |
64 | enum dv_pack_type { |
65 | dv_header525 = 0x3f, /* see dv_write_pack for important details on */ |
66 | dv_header625 = 0xbf, /* these two packs */ |
67 | dv_timecode = 0x13, |
68 | dv_audio_source = 0x50, |
69 | dv_audio_control = 0x51, |
70 | dv_audio_recdate = 0x52, |
71 | dv_audio_rectime = 0x53, |
72 | dv_video_source = 0x60, |
73 | dv_video_control = 0x61, |
74 | dv_video_recdate = 0x62, |
75 | dv_video_rectime = 0x63, |
76 | dv_unknown_pack = 0xff, |
77 | }; |
78 | |
79 | #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10) |
80 | #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1)) |
81 | #define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1)) |
82 | |
83 | /** |
84 | * largest possible DV frame, in bytes (1080i50) |
85 | */ |
86 | #define DV_MAX_FRAME_SIZE 576000 |
87 | |
88 | /** |
89 | * maximum number of blocks per macroblock in any DV format |
90 | */ |
91 | #define DV_MAX_BPM 8 |
92 | |
93 | #define TEX_VLC_BITS 10 |
94 | |
95 | extern RL_VLC_ELEM ff_dv_rl_vlc[1664]; |
96 | |
97 | int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d); |
98 | |
99 | int ff_dvvideo_init(AVCodecContext *avctx); |
100 | |
101 | static inline int dv_work_pool_size(const AVDVProfile *d) |
102 | { |
103 | int size = d->n_difchan * d->difseg_size * 27; |
104 | if (DV_PROFILE_IS_1080i50(d)) |
105 | size -= 3 * 27; |
106 | if (DV_PROFILE_IS_720p50(d)) |
107 | size -= 4 * 27; |
108 | return size; |
109 | } |
110 | |
111 | static inline void dv_calculate_mb_xy(DVVideoContext *s, |
112 | DVwork_chunk *work_chunk, |
113 | int m, int *mb_x, int *mb_y) |
114 | { |
115 | *mb_x = work_chunk->mb_coordinates[m] & 0xff; |
116 | *mb_y = work_chunk->mb_coordinates[m] >> 8; |
117 | |
118 | /* We work with 720p frames split in half. |
119 | * The odd half-frame (chan == 2,3) is displaced :-( */ |
120 | if (s->sys->height == 720 && !(s->buf[1] & 0x0C)) |
121 | /* shifting the Y coordinate down by 72/2 macro blocks */ |
122 | *mb_y -= (*mb_y > 17) ? 18 : -72; |
123 | } |
124 | |
125 | #endif /* AVCODEC_DV_H */ |
126 |