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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_DVDATA_H
  28. #define AVCODEC_DVDATA_H
  29.  
  30. #include "avcodec.h"
  31. #include "dsputil.h"
  32. #include "get_bits.h"
  33. #include "dv_profile.h"
  34.  
  35. typedef struct DVVideoContext {
  36.     const DVprofile *sys;
  37.     AVFrame          picture;
  38.     AVCodecContext  *avctx;
  39.     uint8_t         *buf;
  40.  
  41.     uint8_t  dv_zigzag[2][64];
  42.  
  43.     void (*get_pixels)(int16_t *block, const uint8_t *pixels, int line_size);
  44.     void (*fdct[2])(int16_t *block);
  45.     void (*idct_put[2])(uint8_t *dest, int line_size, int16_t *block);
  46.     me_cmp_func ildct_cmp;
  47. } DVVideoContext;
  48.  
  49. enum dv_section_type {
  50.      dv_sect_header  = 0x1f,
  51.      dv_sect_subcode = 0x3f,
  52.      dv_sect_vaux    = 0x56,
  53.      dv_sect_audio   = 0x76,
  54.      dv_sect_video   = 0x96,
  55. };
  56.  
  57. enum dv_pack_type {
  58.      dv_header525     = 0x3f, /* see dv_write_pack for important details on */
  59.      dv_header625     = 0xbf, /* these two packs */
  60.      dv_timecode      = 0x13,
  61.      dv_audio_source  = 0x50,
  62.      dv_audio_control = 0x51,
  63.      dv_audio_recdate = 0x52,
  64.      dv_audio_rectime = 0x53,
  65.      dv_video_source  = 0x60,
  66.      dv_video_control = 0x61,
  67.      dv_video_recdate = 0x62,
  68.      dv_video_rectime = 0x63,
  69.      dv_unknown_pack  = 0xff,
  70. };
  71.  
  72. extern const uint8_t ff_dv_quant_shifts[22][4];
  73. extern const uint8_t ff_dv_quant_offset[4];
  74.  
  75. extern const int ff_dv_iweight_88[64];
  76. extern const int ff_dv_iweight_248[64];
  77. extern const int ff_dv_iweight_1080_y[64];
  78. extern const int ff_dv_iweight_1080_c[64];
  79. extern const int ff_dv_iweight_720_y[64];
  80. extern const int ff_dv_iweight_720_c[64];
  81.  
  82. #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
  83. #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
  84. #define DV_PROFILE_IS_720p50(p)  (((p)->video_stype == 0x18) && ((p)->dsf == 1))
  85.  
  86. /**
  87.  * largest possible DV frame, in bytes (1080i50)
  88.  */
  89. #define DV_MAX_FRAME_SIZE 576000
  90.  
  91. /**
  92.  * maximum number of blocks per macroblock in any DV format
  93.  */
  94. #define DV_MAX_BPM 8
  95.  
  96. #define TEX_VLC_BITS 9
  97.  
  98. extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
  99.  
  100. int ff_dv_init_dynamic_tables(const DVprofile *d);
  101. int ff_dvvideo_init(AVCodecContext *avctx);
  102.  
  103. static inline int dv_work_pool_size(const DVprofile *d)
  104. {
  105.     int size = d->n_difchan*d->difseg_size*27;
  106.     if (DV_PROFILE_IS_1080i50(d))
  107.         size -= 3*27;
  108.     if (DV_PROFILE_IS_720p50(d))
  109.         size -= 4*27;
  110.     return size;
  111. }
  112.  
  113. static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, 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. The odd half-frame (chan==2,3) is displaced :-( */
  119.      if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
  120.          *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
  121.      }
  122. }
  123.  
  124. #endif /* AVCODEC_DVDATA_H */
  125.