| 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 "get_bits.h" |
| 33 | #include "me_cmp.h" |
| 34 | |
| 35 | typedef struct DVwork_chunk { |
| 36 | uint16_t buf_offset; |
| 37 | uint16_t mb_coordinates[5]; |
| 38 | } DVwork_chunk; |
| 39 | |
| 40 | typedef 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, ptrdiff_t 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 | |
| 56 | enum 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 | |
| 64 | enum 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 | * largest possible DV frame, in bytes (1080i50) |
| 85 | */ |
| 86 | #define DV_MAX_FRAME_SIZE 576000 |
| 87 | |
| 88 | /** |
| 89 | * maximum number of blocks per macroblock in any DV format |
| 90 | */ |
| 91 | #define DV_MAX_BPM 8 |
| 92 | |
| 93 | #define TEX_VLC_BITS 9 |
| 94 | |
| 95 | extern RL_VLC_ELEM ff_dv_rl_vlc[1184]; |
| 96 | |
| 97 | int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d); |
| 98 | int ff_dvvideo_init(AVCodecContext *avctx); |
| 99 | |
| 100 | static inline int dv_work_pool_size(const AVDVProfile *d) |
| 101 | { |
| 102 | int size = d->n_difchan * d->difseg_size * 27; |
| 103 | if (DV_PROFILE_IS_1080i50(d)) |
| 104 | size -= 3 * 27; |
| 105 | if (DV_PROFILE_IS_720p50(d)) |
| 106 | size -= 4 * 27; |
| 107 | return size; |
| 108 | } |
| 109 | |
| 110 | static inline void dv_calculate_mb_xy(DVVideoContext *s, |
| 111 | DVwork_chunk *work_chunk, |
| 112 | int m, int *mb_x, int *mb_y) |
| 113 | { |
| 114 | *mb_x = work_chunk->mb_coordinates[m] & 0xff; |
| 115 | *mb_y = work_chunk->mb_coordinates[m] >> 8; |
| 116 | |
| 117 | /* We work with 720p frames split in half. |
| 118 | * The odd half-frame (chan == 2,3) is displaced :-( */ |
| 119 | if (s->sys->height == 720 && !(s->buf[1] & 0x0C)) |
| 120 | /* shifting the Y coordinate down by 72/2 macro blocks */ |
| 121 | *mb_y -= (*mb_y > 17) ? 18 : -72; |
| 122 | } |
| 123 | |
| 124 | #endif /* AVCODEC_DV_H */ |