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  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 10
  94.  
  95. extern RL_VLC_ELEM ff_dv_rl_vlc[1664];
  96.  
  97. int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);
  98.  
  99. int ff_dvvideo_init(AVCodecContext *avctx);
  100.  
  101. static 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.  
  111. static inline void dv_calculate_mb_xy(DVVideoContext *s,
  112.                                       DVwork_chunk *work_chunk,
  113.                                       int m, int *mb_x, int *mb_y)
  114. {
  115.     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
  116.     *mb_y = work_chunk->mb_coordinates[m] >> 8;
  117.  
  118.     /* We work with 720p frames split in half.
  119.      * The odd half-frame (chan == 2,3) is displaced :-( */
  120.     if (s->sys->height == 720 && !(s->buf[1] & 0x0C))
  121.         /* shifting the Y coordinate down by 72/2 macro blocks */
  122.         *mb_y -= (*mb_y > 17) ? 18 : -72;
  123. }
  124.  
  125. #endif /* AVCODEC_DV_H */
  126.