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 "idctdsp.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 AVClass *avclass; 42 const AVDVProfile *sys; 43 const AVFrame *frame; 44 AVCodecContext *avctx; 45 uint8_t *buf; 46 47 uint8_t dv_zigzag[2][64]; 48 49 void (*get_pixels)(int16_t *block, const uint8_t *pixels, ptrdiff_t linesize); 50 void (*fdct[2])(int16_t *block); 51 void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block); 52 me_cmp_func ildct_cmp; 53 DVwork_chunk work_chunks[4 * 12 * 27]; 54 uint32_t idct_factor[2 * 4 * 16 * 64]; 55 IDCTDSPContext idsp; 56 57 int quant_deadzone; 58} DVVideoContext; 59 60enum dv_section_type { 61 dv_sect_header = 0x1f, 62 dv_sect_subcode = 0x3f, 63 dv_sect_vaux = 0x56, 64 dv_sect_audio = 0x76, 65 dv_sect_video = 0x96, 66}; 67 68enum dv_pack_type { 69 dv_header525 = 0x3f, /* see dv_write_pack for important details on */ 70 dv_header625 = 0xbf, /* these two packs */ 71 dv_timecode = 0x13, 72 dv_audio_source = 0x50, 73 dv_audio_control = 0x51, 74 dv_audio_recdate = 0x52, 75 dv_audio_rectime = 0x53, 76 dv_video_source = 0x60, 77 dv_video_control = 0x61, 78 dv_video_recdate = 0x62, 79 dv_video_rectime = 0x63, 80 dv_unknown_pack = 0xff, 81}; 82 83#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10) 84#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1)) 85#define DV_PROFILE_IS_1080i60(p) (((p)->video_stype == 0x14) && ((p)->dsf == 0)) 86#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1)) 87 88/** 89 * largest possible DV frame, in bytes (1080i50) 90 */ 91#define DV_MAX_FRAME_SIZE 576000 92 93/** 94 * maximum number of blocks per macroblock in any DV format 95 */ 96#define DV_MAX_BPM 8 97 98int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d); 99 100int ff_dvvideo_init(AVCodecContext *avctx); 101 102static inline int dv_work_pool_size(const AVDVProfile *d) 103{ 104 int size = d->n_difchan * d->difseg_size * 27; 105 if (DV_PROFILE_IS_1080i50(d)) 106 size -= 3 * 27; 107 if (DV_PROFILE_IS_720p50(d)) 108 size -= 4 * 27; 109 return size; 110} 111 112static inline void dv_calculate_mb_xy(DVVideoContext *s, 113 DVwork_chunk *work_chunk, 114 int m, int *mb_x, int *mb_y) 115{ 116 *mb_x = work_chunk->mb_coordinates[m] & 0xff; 117 *mb_y = work_chunk->mb_coordinates[m] >> 8; 118 119 /* We work with 720p frames split in half. 120 * The odd half-frame (chan == 2,3) is displaced :-( */ 121 if (s->sys->height == 720 && !(s->buf[1] & 0x0C)) 122 /* shifting the Y coordinate down by 72/2 macro blocks */ 123 *mb_y -= (*mb_y > 17) ? 18 : -72; 124} 125 126#endif /* AVCODEC_DV_H */ 127