Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 1e9caf9c92
Fetching contributors…

Cannot retrieve contributors at this time

file 124 lines (104 sloc) 3.691 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
/*
* Constants for DV codec
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* Constants for DV codec.
*/

#ifndef AVCODEC_DVDATA_H
#define AVCODEC_DVDATA_H

#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "dv_profile.h"

typedef struct DVVideoContext {
    const DVprofile *sys;
    AVFrame picture;
    AVCodecContext *avctx;
    uint8_t *buf;

    uint8_t dv_zigzag[2][64];

    void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
    void (*fdct[2])(DCTELEM *block);
    void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
    me_cmp_func ildct_cmp;
} DVVideoContext;

enum dv_section_type {
     dv_sect_header = 0x1f,
     dv_sect_subcode = 0x3f,
     dv_sect_vaux = 0x56,
     dv_sect_audio = 0x76,
     dv_sect_video = 0x96,
};

enum dv_pack_type {
     dv_header525 = 0x3f, /* see dv_write_pack for important details on */
     dv_header625 = 0xbf, /* these two packs */
     dv_timecode = 0x13,
     dv_audio_source = 0x50,
     dv_audio_control = 0x51,
     dv_audio_recdate = 0x52,
     dv_audio_rectime = 0x53,
     dv_video_source = 0x60,
     dv_video_control = 0x61,
     dv_video_recdate = 0x62,
     dv_video_rectime = 0x63,
     dv_unknown_pack = 0xff,
};

extern const uint8_t ff_dv_quant_shifts[22][4];
extern const uint8_t ff_dv_quant_offset[4];

extern const int ff_dv_iweight_88[64];
extern const int ff_dv_iweight_248[64];
extern const int ff_dv_iweight_1080_y[64];
extern const int ff_dv_iweight_1080_c[64];
extern const int ff_dv_iweight_720_y[64];
extern const int ff_dv_iweight_720_c[64];

#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))

/**
* largest possible DV frame, in bytes (1080i50)
*/
#define DV_MAX_FRAME_SIZE 576000

/**
* maximum number of blocks per macroblock in any DV format
*/
#define DV_MAX_BPM 8

#define TEX_VLC_BITS 9

extern RL_VLC_ELEM ff_dv_rl_vlc[1184];

int ff_dv_init_dynamic_tables(const DVprofile *d);
int ff_dvvideo_init(AVCodecContext *avctx);

static inline int dv_work_pool_size(const DVprofile *d)
{
    int size = d->n_difchan*d->difseg_size*27;
    if (DV_PROFILE_IS_1080i50(d))
        size -= 3*27;
    if (DV_PROFILE_IS_720p50(d))
        size -= 4*27;
    return size;
}

static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
{
     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
     *mb_y = work_chunk->mb_coordinates[m] >> 8;

     /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
     if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
         *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
     }
}

#endif /* AVCODEC_DVDATA_H */
Something went wrong with that request. Please try again.