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.
33 #include "dv_profile.h"
35 typedef struct DVwork_chunk {
37 uint16_t mb_coordinates[5];
40 typedef struct DVVideoContext {
43 AVCodecContext *avctx;
46 uint8_t dv_zigzag[2][64];
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];
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))
85 * largest possible DV frame, in bytes (1080i50)
87 #define DV_MAX_FRAME_SIZE 576000
90 * maximum number of blocks per macroblock in any DV format
94 #define TEX_VLC_BITS 9
96 extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
98 int ff_dv_init_dynamic_tables(DVVideoContext *s, const DVprofile *d);
99 int ff_dvvideo_init(AVCodecContext *avctx);
101 static inline int dv_work_pool_size(const DVprofile *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, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
113 *mb_x = work_chunk->mb_coordinates[m] & 0xff;
114 *mb_y = work_chunk->mb_coordinates[m] >> 8;
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 */
122 #endif /* AVCODEC_DV_H */