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  1. /*
  2.  * MPEG4 decoder / encoder common code.
  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. #include "mpegvideo.h"
  24. #include "mpeg4video.h"
  25. #include "mpeg4data.h"
  26.  
  27. uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
  28.  
  29. int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
  30.     switch(s->pict_type){
  31.         case AV_PICTURE_TYPE_I:
  32.             return 16;
  33.         case AV_PICTURE_TYPE_P:
  34.         case AV_PICTURE_TYPE_S:
  35.             return s->f_code+15;
  36.         case AV_PICTURE_TYPE_B:
  37.             return FFMAX3(s->f_code, s->b_code, 2) + 15;
  38.         default:
  39.             return -1;
  40.     }
  41. }
  42.  
  43. void ff_mpeg4_clean_buffers(MpegEncContext *s)
  44. {
  45.     int c_wrap, c_xy, l_wrap, l_xy;
  46.  
  47.     l_wrap= s->b8_stride;
  48.     l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
  49.     c_wrap= s->mb_stride;
  50.     c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
  51.  
  52. #if 0
  53.     /* clean DC */
  54.     memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
  55.     memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
  56.     memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
  57. #endif
  58.  
  59.     /* clean AC */
  60.     memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
  61.     memset(s->ac_val[1] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
  62.     memset(s->ac_val[2] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
  63.  
  64.     /* clean MV */
  65.     // we can't clear the MVs as they might be needed by a b frame
  66. //    memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
  67. //    memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
  68.     s->last_mv[0][0][0]=
  69.     s->last_mv[0][0][1]=
  70.     s->last_mv[1][0][0]=
  71.     s->last_mv[1][0][1]= 0;
  72. }
  73.  
  74. #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
  75. #define tab_bias (tab_size/2)
  76.  
  77. //used by mpeg4 and rv10 decoder
  78. void ff_mpeg4_init_direct_mv(MpegEncContext *s){
  79.     int i;
  80.     for(i=0; i<tab_size; i++){
  81.         s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time;
  82.         s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time;
  83.     }
  84. }
  85.  
  86. static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){
  87.     int xy= s->block_index[i];
  88.     uint16_t time_pp= s->pp_time;
  89.     uint16_t time_pb= s->pb_time;
  90.     int p_mx, p_my;
  91.  
  92.     p_mx = s->next_picture.motion_val[0][xy][0];
  93.     if((unsigned)(p_mx + tab_bias) < tab_size){
  94.         s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
  95.         s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
  96.                             : s->direct_scale_mv[1][p_mx + tab_bias];
  97.     }else{
  98.         s->mv[0][i][0] = p_mx*time_pb/time_pp + mx;
  99.         s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
  100.                             : p_mx*(time_pb - time_pp)/time_pp;
  101.     }
  102.     p_my = s->next_picture.motion_val[0][xy][1];
  103.     if((unsigned)(p_my + tab_bias) < tab_size){
  104.         s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
  105.         s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
  106.                             : s->direct_scale_mv[1][p_my + tab_bias];
  107.     }else{
  108.         s->mv[0][i][1] = p_my*time_pb/time_pp + my;
  109.         s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
  110.                             : p_my*(time_pb - time_pp)/time_pp;
  111.     }
  112. }
  113.  
  114. #undef tab_size
  115. #undef tab_bias
  116.  
  117. /**
  118.  *
  119.  * @return the mb_type
  120.  */
  121. int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
  122.     const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
  123.     const int colocated_mb_type = s->next_picture.mb_type[mb_index];
  124.     uint16_t time_pp;
  125.     uint16_t time_pb;
  126.     int i;
  127.  
  128.     //FIXME avoid divides
  129.     // try special case with shifts for 1 and 3 B-frames?
  130.  
  131.     if(IS_8X8(colocated_mb_type)){
  132.         s->mv_type = MV_TYPE_8X8;
  133.         for(i=0; i<4; i++){
  134.             ff_mpeg4_set_one_direct_mv(s, mx, my, i);
  135.         }
  136.         return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
  137.     } else if(IS_INTERLACED(colocated_mb_type)){
  138.         s->mv_type = MV_TYPE_FIELD;
  139.         for(i=0; i<2; i++){
  140.             int field_select = s->next_picture.ref_index[0][4 * mb_index + 2 * i];
  141.             s->field_select[0][i]= field_select;
  142.             s->field_select[1][i]= i;
  143.             if(s->top_field_first){
  144.                 time_pp= s->pp_field_time - field_select + i;
  145.                 time_pb= s->pb_field_time - field_select + i;
  146.             }else{
  147.                 time_pp= s->pp_field_time + field_select - i;
  148.                 time_pb= s->pb_field_time + field_select - i;
  149.             }
  150.             s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0]*time_pb/time_pp + mx;
  151.             s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1]*time_pb/time_pp + my;
  152.             s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->p_field_mv_table[i][0][mb_index][0]
  153.                                 : s->p_field_mv_table[i][0][mb_index][0]*(time_pb - time_pp)/time_pp;
  154.             s->mv[1][i][1] = my ? s->mv[0][i][1] - s->p_field_mv_table[i][0][mb_index][1]
  155.                                 : s->p_field_mv_table[i][0][mb_index][1]*(time_pb - time_pp)/time_pp;
  156.         }
  157.         return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
  158.     }else{
  159.         ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
  160.         s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0];
  161.         s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1];
  162.         s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0];
  163.         s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1];
  164.         if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
  165.             s->mv_type= MV_TYPE_16X16;
  166.         else
  167.             s->mv_type= MV_TYPE_8X8;
  168.         return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line
  169.     }
  170. }
  171.