/*
  * Constants for DV codec
  * Copyright (c) 2002 Fabrice Bellard
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * Constants for DV codec.
  */
 
 #ifndef AVCODEC_DV_H
 #define AVCODEC_DV_H
 
 #include "avcodec.h"
 #include "dv_profile.h"

 #include "me_cmp.h"

 #include "vlc.h"

 typedef struct DVwork_chunk {

     uint16_t buf_offset;
     uint16_t mb_coordinates[5];

 } DVwork_chunk;
 

 typedef struct DVVideoContext {

     AVClass *avclass;

     const AVDVProfile *sys;

     const AVFrame   *frame;

     AVCodecContext  *avctx;
     uint8_t         *buf;
 

     uint8_t dv_zigzag[2][64];

     void (*get_pixels)(int16_t *block, const uint8_t *pixels, ptrdiff_t linesize);

     void (*fdct[2])(int16_t *block);

     void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block);

     me_cmp_func ildct_cmp;

     DVwork_chunk work_chunks[4 * 12 * 27];
     uint32_t idct_factor[2 * 4 * 16 * 64];

 
     int quant_deadzone;

 } DVVideoContext;
 
 enum dv_section_type {

     dv_sect_header  = 0x1f,
     dv_sect_subcode = 0x3f,
     dv_sect_vaux    = 0x56,
     dv_sect_audio   = 0x76,
     dv_sect_video   = 0x96,

 };
 
 enum dv_pack_type {

     dv_header525     = 0x3f,  /* see dv_write_pack for important details on */
     dv_header625     = 0xbf,  /* these two packs */
     dv_timecode      = 0x13,
     dv_audio_source  = 0x50,
     dv_audio_control = 0x51,
     dv_audio_recdate = 0x52,
     dv_audio_rectime = 0x53,
     dv_video_source  = 0x60,
     dv_video_control = 0x61,
     dv_video_recdate = 0x62,
     dv_video_rectime = 0x63,
     dv_unknown_pack  = 0xff,

 };
 
 #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
 #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
 #define DV_PROFILE_IS_720p50(p)  (((p)->video_stype == 0x18) && ((p)->dsf == 1))
 
 /**
  * largest possible DV frame, in bytes (1080i50)
  */
 #define DV_MAX_FRAME_SIZE 576000
 
 /**
  * maximum number of blocks per macroblock in any DV format
  */
 #define DV_MAX_BPM 8
 

 #define TEX_VLC_BITS 10

 extern RL_VLC_ELEM ff_dv_rl_vlc[1664];

 int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);

 int ff_dvvideo_init(AVCodecContext *avctx);
 

 static inline int dv_work_pool_size(const AVDVProfile *d)

 {

     int size = d->n_difchan * d->difseg_size * 27;

     if (DV_PROFILE_IS_1080i50(d))

         size -= 3 * 27;

     if (DV_PROFILE_IS_720p50(d))

         size -= 4 * 27;

     return size;
 }
 

 static inline void dv_calculate_mb_xy(DVVideoContext *s,
                                       DVwork_chunk *work_chunk,
                                       int m, int *mb_x, int *mb_y)

 {

     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
     *mb_y = work_chunk->mb_coordinates[m] >> 8;
 
     /* We work with 720p frames split in half.
      * The odd half-frame (chan == 2,3) is displaced :-( */
     if (s->sys->height == 720 && !(s->buf[1] & 0x0C))
         /* shifting the Y coordinate down by 72/2 macro blocks */
         *mb_y -= (*mb_y > 17) ? 18 : -72;

 }
 
 #endif /* AVCODEC_DV_H */