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.
27 #ifndef AVCODEC_DVDATA_H
28 #define AVCODEC_DVDATA_H
33 #include "dv_profile.h"
35 typedef struct DVVideoContext {
38 AVCodecContext *avctx;
41 uint8_t dv_zigzag[2][64];
43 void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
44 void (*fdct[2])(DCTELEM *block);
45 void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
46 me_cmp_func ildct_cmp;
49 enum dv_section_type {
50 dv_sect_header = 0x1f,
51 dv_sect_subcode = 0x3f,
58 dv_header525 = 0x3f, /* see dv_write_pack for important details on */
59 dv_header625 = 0xbf, /* these two packs */
61 dv_audio_source = 0x50,
62 dv_audio_control = 0x51,
63 dv_audio_recdate = 0x52,
64 dv_audio_rectime = 0x53,
65 dv_video_source = 0x60,
66 dv_video_control = 0x61,
67 dv_video_recdate = 0x62,
68 dv_video_rectime = 0x63,
69 dv_unknown_pack = 0xff,
72 extern const uint8_t ff_dv_quant_shifts[22][4];
73 extern const uint8_t ff_dv_quant_offset[4];
75 extern const int ff_dv_iweight_88[64];
76 extern const int ff_dv_iweight_248[64];
77 extern const int ff_dv_iweight_1080_y[64];
78 extern const int ff_dv_iweight_1080_c[64];
79 extern const int ff_dv_iweight_720_y[64];
80 extern const int ff_dv_iweight_720_c[64];
82 #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
83 #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
84 #define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
87 * largest possible DV frame, in bytes (1080i50)
89 #define DV_MAX_FRAME_SIZE 576000
92 * maximum number of blocks per macroblock in any DV format
96 #define TEX_VLC_BITS 9
98 extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
100 int ff_dv_init_dynamic_tables(const DVprofile *d);
101 int ff_dvvideo_init(AVCodecContext *avctx);
103 static inline int dv_work_pool_size(const DVprofile *d)
105 int size = d->n_difchan*d->difseg_size*27;
106 if (DV_PROFILE_IS_1080i50(d))
108 if (DV_PROFILE_IS_720p50(d))
113 static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, 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. The odd half-frame (chan==2,3) is displaced :-( */
119 if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
120 *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
124 #endif /* AVCODEC_DVDATA_H */