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 "dsputil.h" 32#include "get_bits.h" 33#include "dv_profile.h" 34 35typedef struct DVwork_chunk { 36 uint16_t buf_offset; 37 uint16_t mb_coordinates[5]; 38} DVwork_chunk; 39 40typedef struct DVVideoContext { 41 const AVDVProfile *sys; 42 AVFrame *frame; 43 AVCodecContext *avctx; 44 uint8_t *buf; 45 46 uint8_t dv_zigzag[2][64]; 47 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]; 54} DVVideoContext; 55 56enum dv_section_type { 57 dv_sect_header = 0x1f, 58 dv_sect_subcode = 0x3f, 59 dv_sect_vaux = 0x56, 60 dv_sect_audio = 0x76, 61 dv_sect_video = 0x96, 62}; 63 64enum dv_pack_type { 65 dv_header525 = 0x3f, /* see dv_write_pack for important details on */ 66 dv_header625 = 0xbf, /* these two packs */ 67 dv_timecode = 0x13, 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, 77}; 78 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)) 82 83 84/** 85 * largest possible DV frame, in bytes (1080i50) 86 */ 87#define DV_MAX_FRAME_SIZE 576000 88 89/** 90 * maximum number of blocks per macroblock in any DV format 91 */ 92#define DV_MAX_BPM 8 93 94#define TEX_VLC_BITS 9 95 96extern RL_VLC_ELEM ff_dv_rl_vlc[1184]; 97 98int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d); 99int ff_dvvideo_init(AVCodecContext *avctx); 100 101static inline int dv_work_pool_size(const AVDVProfile *d) 102{ 103 int size = d->n_difchan*d->difseg_size*27; 104 if (DV_PROFILE_IS_1080i50(d)) 105 size -= 3*27; 106 if (DV_PROFILE_IS_720p50(d)) 107 size -= 4*27; 108 return size; 109} 110 111static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y) 112{ 113 *mb_x = work_chunk->mb_coordinates[m] & 0xff; 114 *mb_y = work_chunk->mb_coordinates[m] >> 8; 115 116 /* 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 */ 119 } 120} 121 122#endif /* AVCODEC_DV_H */ 123