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  1. /*
  2.  * MPEG4 encoder/decoder internal header.
  3.  * Copyright (c) 2000,2001 Fabrice Bellard
  4.  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_MPEG4VIDEO_H
  24. #define AVCODEC_MPEG4VIDEO_H
  25.  
  26. #include <stdint.h>
  27. #include "get_bits.h"
  28. #include "mpegvideo.h"
  29. #include "rl.h"
  30.  
  31. // shapes
  32. #define RECT_SHAPE       0
  33. #define BIN_SHAPE        1
  34. #define BIN_ONLY_SHAPE   2
  35. #define GRAY_SHAPE       3
  36.  
  37. #define SIMPLE_VO_TYPE             1
  38. #define CORE_VO_TYPE               3
  39. #define MAIN_VO_TYPE               4
  40. #define NBIT_VO_TYPE               5
  41. #define ARTS_VO_TYPE               10
  42. #define ACE_VO_TYPE                12
  43. #define ADV_SIMPLE_VO_TYPE         17
  44.  
  45. // aspect_ratio_info
  46. #define EXTENDED_PAR 15
  47.  
  48. //vol_sprite_usage / sprite_enable
  49. #define STATIC_SPRITE 1
  50. #define GMC_SPRITE 2
  51.  
  52. #define MOTION_MARKER 0x1F001
  53. #define DC_MARKER     0x6B001
  54.  
  55. #define VOS_STARTCODE        0x1B0
  56. #define USER_DATA_STARTCODE  0x1B2
  57. #define GOP_STARTCODE        0x1B3
  58. #define VISUAL_OBJ_STARTCODE 0x1B5
  59. #define VOP_STARTCODE        0x1B6
  60.  
  61. /* dc encoding for mpeg4 */
  62. extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
  63. extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
  64.  
  65. extern const uint16_t ff_mpeg4_intra_vlc[103][2];
  66. extern const int8_t ff_mpeg4_intra_level[102];
  67. extern const int8_t ff_mpeg4_intra_run[102];
  68.  
  69. extern RLTable ff_mpeg4_rl_intra;
  70.  
  71. /* Note this is identical to the intra rvlc except that it is reordered. */
  72. extern RLTable ff_rvlc_rl_inter;
  73. extern RLTable ff_rvlc_rl_intra;
  74.  
  75. extern const uint16_t ff_sprite_trajectory_tab[15][2];
  76. extern const uint8_t ff_mb_type_b_tab[4][2];
  77.  
  78. /* these matrixes will be permuted for the idct */
  79. extern const int16_t ff_mpeg4_default_intra_matrix[64];
  80. extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
  81.  
  82. extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
  83. extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
  84. extern const uint16_t ff_mpeg4_resync_prefix[8];
  85.  
  86. extern const uint8_t ff_mpeg4_dc_threshold[8];
  87.  
  88. void ff_mpeg4_encode_mb(MpegEncContext *s,
  89.                         int16_t block[6][64],
  90.                         int motion_x, int motion_y);
  91. void ff_mpeg4_pred_ac(MpegEncContext * s, int16_t *block, int n,
  92.                       int dir);
  93. void ff_set_mpeg4_time(MpegEncContext * s);
  94. void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
  95.  
  96. int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);
  97. void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
  98. void ff_mpeg4_clean_buffers(MpegEncContext *s);
  99. void ff_mpeg4_stuffing(PutBitContext * pbc);
  100. void ff_mpeg4_init_partitions(MpegEncContext *s);
  101. void ff_mpeg4_merge_partitions(MpegEncContext *s);
  102. void ff_clean_mpeg4_qscales(MpegEncContext *s);
  103. int ff_mpeg4_decode_partitions(MpegEncContext *s);
  104. int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
  105. int ff_mpeg4_decode_video_packet_header(MpegEncContext *s);
  106. void ff_mpeg4_init_direct_mv(MpegEncContext *s);
  107. void ff_mpeg4videodec_static_init(void);
  108.  
  109. /**
  110.  *
  111.  * @return the mb_type
  112.  */
  113. int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
  114.  
  115. extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
  116.  
  117.  
  118. #if 0 //3IV1 is quite rare and it slows things down a tiny bit
  119. #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
  120. #else
  121. #define IS_3IV1 0
  122. #endif
  123.  
  124.  
  125. /**
  126.  * Predict the dc.
  127.  * encoding quantized level -> quantized diff
  128.  * decoding quantized diff -> quantized level
  129.  * @param n block index (0-3 are luma, 4-5 are chroma)
  130.  * @param dir_ptr pointer to an integer where the prediction direction will be stored
  131.  */
  132. static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
  133. {
  134.     int a, b, c, wrap, pred, scale, ret;
  135.     int16_t *dc_val;
  136.  
  137.     /* find prediction */
  138.     if (n < 4) {
  139.         scale = s->y_dc_scale;
  140.     } else {
  141.         scale = s->c_dc_scale;
  142.     }
  143.     if(IS_3IV1)
  144.         scale= 8;
  145.  
  146.     wrap= s->block_wrap[n];
  147.     dc_val = s->dc_val[0] + s->block_index[n];
  148.  
  149.     /* B C
  150.      * A X
  151.      */
  152.     a = dc_val[ - 1];
  153.     b = dc_val[ - 1 - wrap];
  154.     c = dc_val[ - wrap];
  155.  
  156.     /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
  157.     if(s->first_slice_line && n!=3){
  158.         if(n!=2) b=c= 1024;
  159.         if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
  160.     }
  161.     if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
  162.         if(n==0 || n==4 || n==5)
  163.             b=1024;
  164.     }
  165.  
  166.     if (abs(a - b) < abs(b - c)) {
  167.         pred = c;
  168.         *dir_ptr = 1; /* top */
  169.     } else {
  170.         pred = a;
  171.         *dir_ptr = 0; /* left */
  172.     }
  173.     /* we assume pred is positive */
  174.     pred = FASTDIV((pred + (scale >> 1)), scale);
  175.  
  176.     if(encoding){
  177.         ret = level - pred;
  178.     }else{
  179.         level += pred;
  180.         ret= level;
  181.         if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)){
  182.             if(level<0){
  183.                 av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
  184.                 return -1;
  185.             }
  186.             if(level*scale > 2048 + scale){
  187.                 av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
  188.                 return -1;
  189.             }
  190.         }
  191.     }
  192.     level *=scale;
  193.     if(level&(~2047)){
  194.         if(level<0)
  195.             level=0;
  196.         else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
  197.             level=2047;
  198.     }
  199.     dc_val[0]= level;
  200.  
  201.     return ret;
  202. }
  203. #endif /* AVCODEC_MPEG4VIDEO_H */
  204.