FFmpeg
dv.h
Go to the documentation of this file.
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 {
43  const AVDVProfile *sys;
44  const AVFrame *frame;
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);
54  DVwork_chunk work_chunks[4 * 12 * 27];
55  uint32_t idct_factor[2 * 4 * 16 * 64];
57 
60 
64  dv_sect_vaux = 0x56,
65  dv_sect_audio = 0x76,
66  dv_sect_video = 0x96,
67 };
68 
70  dv_header525 = 0x3f, /* see dv_write_pack for important details on */
71  dv_header625 = 0xbf, /* these two packs */
72  dv_timecode = 0x13,
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 
104 
105 int ff_dvvideo_init(AVCodecContext *avctx);
106 
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 
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 */
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
me_cmp_func ildct_cmp
Definition: dv.h:53
int quant_deadzone
Definition: dv.h:58
uint8_t * buf
Definition: dv.h:46
#define DV_PROFILE_IS_1080i50(p)
Definition: dv.h:85
AVCodecContext * avctx
Definition: dv.h:45
The exact code depends on how similar the blocks are and how related they are to the block
dv_pack_type
Definition: dv.h:69
uint8_t
int difseg_size
Definition: dv_profile.h:43
int(* me_cmp_func)(struct MpegEncContext *c, uint8_t *blk1, uint8_t *blk2, ptrdiff_t stride, int h)
Definition: me_cmp.h:48
#define DV_PROFILE_IS_720p50(p)
Definition: dv.h:87
ptrdiff_t size
Definition: opengl_enc.c:100
uint16_t mb_coordinates[5]
Definition: dv.h:38
static int dv_work_pool_size(const AVDVProfile *d)
Definition: dv.h:107
const AVFrame * frame
Definition: dv.h:44
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
#define s(width, name)
Definition: cbs_vp9.c:257
IDCTDSPContext idsp
Definition: dv.h:56
int ff_dvvideo_init(AVCodecContext *avctx)
Definition: dv.c:198
static void idct_put(FourXContext *f, int x, int y)
Definition: 4xm.c:556
Libavcodec external API header.
Definition: dv.h:72
main external API structure.
Definition: avcodec.h:1568
Describe the class of an AVClass context structure.
Definition: log.h:67
AVClass * avclass
Definition: dv.h:42
int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d)
Definition: dv.c:175
RL_VLC_ELEM ff_dv_rl_vlc[1664]
Definition: dv.c:52
dv_section_type
Definition: dv.h:61
uint16_t buf_offset
Definition: dv.h:37
int pixels
Definition: avisynth_c.h:390
static void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
Definition: dv.h:117
const AVDVProfile * sys
Definition: dv.h:43
int n_difchan
Definition: dv_profile.h:44
#define stride