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 27uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3]; 28 29int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){ 30 switch(s->pict_type){ 31 case FF_I_TYPE: 32 return 16; 33 case FF_P_TYPE: 34 case FF_S_TYPE: 35 return s->f_code+15; 36 case FF_B_TYPE: 37 return FFMAX3(s->f_code, s->b_code, 2) + 15; 38 default: 39 return -1; 40 } 41} 42 43void 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 78void 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 86static 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 */ 121int 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} 171 172