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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 "get_bits.h" | |
33 | #include "me_cmp.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 | 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 line_size); | |
49 | void (*fdct[2])(int16_t *block); | |
50 | void (*idct_put[2])(uint8_t *dest, int line_size, 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 | ||
f6fa7814 | 93 | #define TEX_VLC_BITS 10 |
2ba45a60 | 94 | |
f6fa7814 | 95 | extern RL_VLC_ELEM ff_dv_rl_vlc[1664]; |
2ba45a60 DM |
96 | |
97 | int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d); | |
f6fa7814 | 98 | |
2ba45a60 DM |
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 */ |