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