2 * Constants for DV codec
3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 * Constants for DV codec.
31 #include "dv_profile.h"
35 typedef struct DVwork_chunk
{
37 uint16_t mb_coordinates
[5];
40 typedef struct DVVideoContext
{
41 const AVDVProfile
*sys
;
43 AVCodecContext
*avctx
;
46 uint8_t dv_zigzag
[2][64];
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];
56 enum dv_section_type
{
57 dv_sect_header
= 0x1f,
58 dv_sect_subcode
= 0x3f,
65 dv_header525
= 0x3f, /* see dv_write_pack for important details on */
66 dv_header625
= 0xbf, /* these two packs */
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,
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))
84 * largest possible DV frame, in bytes (1080i50)
86 #define DV_MAX_FRAME_SIZE 576000
89 * maximum number of blocks per macroblock in any DV format
93 #define TEX_VLC_BITS 10
95 extern RL_VLC_ELEM ff_dv_rl_vlc
[1664];
97 int ff_dv_init_dynamic_tables(DVVideoContext
*s
, const AVDVProfile
*d
);
99 int ff_dvvideo_init(AVCodecContext
*avctx
);
101 static inline int dv_work_pool_size(const AVDVProfile
*d
)
103 int size
= d
->n_difchan
* d
->difseg_size
* 27;
104 if (DV_PROFILE_IS_1080i50(d
))
106 if (DV_PROFILE_IS_720p50(d
))
111 static inline void dv_calculate_mb_xy(DVVideoContext
*s
,
112 DVwork_chunk
*work_chunk
,
113 int m
, int *mb_x
, int *mb_y
)
115 *mb_x
= work_chunk
->mb_coordinates
[m
] & 0xff;
116 *mb_y
= work_chunk
->mb_coordinates
[m
] >> 8;
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;
125 #endif /* AVCODEC_DV_H */