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 "dsputil.h"
32#include "get_bits.h"
33#include "dv_profile.h"
34
35typedef struct DVwork_chunk {
36    uint16_t  buf_offset;
37    uint16_t  mb_coordinates[5];
38} DVwork_chunk;
39
40typedef 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, int 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
56enum 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
64enum 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/**
85 * largest possible DV frame, in bytes (1080i50)
86 */
87#define DV_MAX_FRAME_SIZE 576000
88
89/**
90 * maximum number of blocks per macroblock in any DV format
91 */
92#define DV_MAX_BPM 8
93
94#define TEX_VLC_BITS 9
95
96extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
97
98int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);
99int ff_dvvideo_init(AVCodecContext *avctx);
100
101static 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
111static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
112{
113     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
114     *mb_y = work_chunk->mb_coordinates[m] >> 8;
115
116     /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
117     if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
118         *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
119     }
120}
121
122#endif /* AVCODEC_DV_H */
123