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4349 | Serge | 1 | /* |
2 | * Copyright (C) 2006 Aurelien Jacobs |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * VP5 compatible video decoder |
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24 | */ |
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25 | |||
26 | #include |
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27 | #include |
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28 | |||
29 | #include "avcodec.h" |
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30 | #include "get_bits.h" |
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31 | |||
32 | #include "vp56.h" |
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33 | #include "vp56data.h" |
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34 | #include "vp5data.h" |
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35 | |||
36 | |||
37 | static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) |
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38 | { |
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39 | VP56RangeCoder *c = &s->c; |
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40 | int rows, cols; |
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41 | |||
42 | ff_vp56_init_range_decoder(&s->c, buf, buf_size); |
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43 | s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c); |
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44 | vp56_rac_get(c); |
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45 | ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); |
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46 | if (s->frames[VP56_FRAME_CURRENT]->key_frame) |
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47 | { |
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48 | vp56_rac_gets(c, 8); |
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49 | if(vp56_rac_gets(c, 5) > 5) |
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50 | return AVERROR_INVALIDDATA; |
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51 | vp56_rac_gets(c, 2); |
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52 | if (vp56_rac_get(c)) { |
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53 | av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); |
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54 | return AVERROR_PATCHWELCOME; |
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55 | } |
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56 | rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ |
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57 | cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ |
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58 | if (!rows || !cols) { |
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59 | av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", |
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60 | cols << 4, rows << 4); |
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61 | return AVERROR_INVALIDDATA; |
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62 | } |
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63 | vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ |
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64 | vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ |
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65 | vp56_rac_gets(c, 2); |
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66 | if (!s->macroblocks || /* first frame */ |
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67 | 16*cols != s->avctx->coded_width || |
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68 | 16*rows != s->avctx->coded_height) { |
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69 | avcodec_set_dimensions(s->avctx, 16*cols, 16*rows); |
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70 | return VP56_SIZE_CHANGE; |
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71 | } |
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72 | } else if (!s->macroblocks) |
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73 | return AVERROR_INVALIDDATA; |
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74 | return 0; |
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75 | } |
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76 | |||
77 | static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect) |
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78 | { |
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79 | VP56RangeCoder *c = &s->c; |
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80 | VP56Model *model = s->modelp; |
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81 | int comp, di; |
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82 | |||
83 | for (comp=0; comp<2; comp++) { |
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84 | int delta = 0; |
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85 | if (vp56_rac_get_prob(c, model->vector_dct[comp])) { |
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86 | int sign = vp56_rac_get_prob(c, model->vector_sig[comp]); |
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87 | di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]); |
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88 | di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1; |
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89 | delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, |
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90 | model->vector_pdv[comp]); |
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91 | delta = di | (delta << 2); |
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92 | delta = (delta ^ -sign) + sign; |
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93 | } |
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94 | if (!comp) |
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95 | vect->x = delta; |
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96 | else |
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97 | vect->y = delta; |
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98 | } |
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99 | } |
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100 | |||
101 | static void vp5_parse_vector_models(VP56Context *s) |
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102 | { |
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103 | VP56RangeCoder *c = &s->c; |
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104 | VP56Model *model = s->modelp; |
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105 | int comp, node; |
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106 | |||
107 | for (comp=0; comp<2; comp++) { |
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108 | if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0])) |
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109 | model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); |
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110 | if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1])) |
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111 | model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); |
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112 | if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2])) |
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113 | model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7); |
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114 | if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3])) |
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115 | model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7); |
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116 | } |
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117 | |||
118 | for (comp=0; comp<2; comp++) |
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119 | for (node=0; node<7; node++) |
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120 | if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node])) |
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121 | model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); |
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122 | } |
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123 | |||
124 | static int vp5_parse_coeff_models(VP56Context *s) |
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125 | { |
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126 | VP56RangeCoder *c = &s->c; |
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127 | VP56Model *model = s->modelp; |
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128 | uint8_t def_prob[11]; |
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129 | int node, cg, ctx; |
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130 | int ct; /* code type */ |
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131 | int pt; /* plane type (0 for Y, 1 for U or V) */ |
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132 | |||
133 | memset(def_prob, 0x80, sizeof(def_prob)); |
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134 | |||
135 | for (pt=0; pt<2; pt++) |
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136 | for (node=0; node<11; node++) |
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137 | if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) { |
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138 | def_prob[node] = vp56_rac_gets_nn(c, 7); |
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139 | model->coeff_dccv[pt][node] = def_prob[node]; |
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140 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { |
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141 | model->coeff_dccv[pt][node] = def_prob[node]; |
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142 | } |
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143 | |||
144 | for (ct=0; ct<3; ct++) |
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145 | for (pt=0; pt<2; pt++) |
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146 | for (cg=0; cg<6; cg++) |
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147 | for (node=0; node<11; node++) |
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148 | if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) { |
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149 | def_prob[node] = vp56_rac_gets_nn(c, 7); |
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150 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; |
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151 | } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { |
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152 | model->coeff_ract[pt][ct][cg][node] = def_prob[node]; |
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153 | } |
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154 | |||
155 | /* coeff_dcct is a linear combination of coeff_dccv */ |
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156 | for (pt=0; pt<2; pt++) |
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157 | for (ctx=0; ctx<36; ctx++) |
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158 | for (node=0; node<5; node++) |
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159 | model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254); |
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160 | |||
161 | /* coeff_acct is a linear combination of coeff_ract */ |
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162 | for (ct=0; ct<3; ct++) |
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163 | for (pt=0; pt<2; pt++) |
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164 | for (cg=0; cg<3; cg++) |
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165 | for (ctx=0; ctx<6; ctx++) |
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166 | for (node=0; node<5; node++) |
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167 | model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254); |
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168 | return 0; |
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169 | } |
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170 | |||
171 | static void vp5_parse_coeff(VP56Context *s) |
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172 | { |
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173 | VP56RangeCoder *c = &s->c; |
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174 | VP56Model *model = s->modelp; |
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175 | uint8_t *permute = s->idct_scantable; |
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176 | uint8_t *model1, *model2; |
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177 | int coeff, sign, coeff_idx; |
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178 | int b, i, cg, idx, ctx, ctx_last; |
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179 | int pt = 0; /* plane type (0 for Y, 1 for U or V) */ |
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180 | |||
181 | for (b=0; b<6; b++) { |
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182 | int ct = 1; /* code type */ |
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183 | |||
184 | if (b > 3) pt = 1; |
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185 | |||
186 | ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] |
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187 | + s->above_blocks[s->above_block_idx[b]].not_null_dc; |
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188 | model1 = model->coeff_dccv[pt]; |
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189 | model2 = model->coeff_dcct[pt][ctx]; |
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190 | |||
191 | coeff_idx = 0; |
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192 | for (;;) { |
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193 | if (vp56_rac_get_prob(c, model2[0])) { |
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194 | if (vp56_rac_get_prob(c, model2[2])) { |
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195 | if (vp56_rac_get_prob(c, model2[3])) { |
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196 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; |
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197 | idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); |
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198 | sign = vp56_rac_get(c); |
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199 | coeff = ff_vp56_coeff_bias[idx+5]; |
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200 | for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) |
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201 | coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; |
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202 | } else { |
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203 | if (vp56_rac_get_prob(c, model2[4])) { |
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204 | coeff = 3 + vp56_rac_get_prob(c, model1[5]); |
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205 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; |
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206 | } else { |
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207 | coeff = 2; |
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208 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; |
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209 | } |
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210 | sign = vp56_rac_get(c); |
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211 | } |
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212 | ct = 2; |
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213 | } else { |
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214 | ct = 1; |
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215 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; |
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216 | sign = vp56_rac_get(c); |
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217 | coeff = 1; |
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218 | } |
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219 | coeff = (coeff ^ -sign) + sign; |
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220 | if (coeff_idx) |
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221 | coeff *= s->dequant_ac; |
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222 | s->block_coeff[b][permute[coeff_idx]] = coeff; |
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223 | } else { |
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224 | if (ct && !vp56_rac_get_prob(c, model2[1])) |
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225 | break; |
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226 | ct = 0; |
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227 | s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; |
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228 | } |
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229 | coeff_idx++; |
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230 | if (coeff_idx >= 64) |
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231 | break; |
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232 | |||
233 | cg = vp5_coeff_groups[coeff_idx]; |
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234 | ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; |
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235 | model1 = model->coeff_ract[pt][ct][cg]; |
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236 | model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; |
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237 | } |
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238 | |||
239 | ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); |
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240 | s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; |
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241 | if (coeff_idx < ctx_last) |
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242 | for (i=coeff_idx; i<=ctx_last; i++) |
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243 | s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; |
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244 | s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; |
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245 | } |
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246 | } |
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247 | |||
248 | static void vp5_default_models_init(VP56Context *s) |
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249 | { |
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250 | VP56Model *model = s->modelp; |
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251 | int i; |
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252 | |||
253 | for (i=0; i<2; i++) { |
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254 | model->vector_sig[i] = 0x80; |
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255 | model->vector_dct[i] = 0x80; |
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256 | model->vector_pdi[i][0] = 0x55; |
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257 | model->vector_pdi[i][1] = 0x80; |
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258 | } |
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259 | memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); |
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260 | memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv)); |
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261 | } |
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262 | |||
263 | static av_cold int vp5_decode_init(AVCodecContext *avctx) |
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264 | { |
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265 | VP56Context *s = avctx->priv_data; |
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266 | int ret; |
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267 | |||
268 | if ((ret = ff_vp56_init(avctx, 1, 0)) < 0) |
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269 | return ret; |
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270 | s->vp56_coord_div = vp5_coord_div; |
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271 | s->parse_vector_adjustment = vp5_parse_vector_adjustment; |
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272 | s->parse_coeff = vp5_parse_coeff; |
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273 | s->default_models_init = vp5_default_models_init; |
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274 | s->parse_vector_models = vp5_parse_vector_models; |
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275 | s->parse_coeff_models = vp5_parse_coeff_models; |
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276 | s->parse_header = vp5_parse_header; |
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277 | |||
278 | return 0; |
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279 | } |
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280 | |||
281 | AVCodec ff_vp5_decoder = { |
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282 | .name = "vp5", |
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283 | .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"), |
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284 | .type = AVMEDIA_TYPE_VIDEO, |
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285 | .id = AV_CODEC_ID_VP5, |
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286 | .priv_data_size = sizeof(VP56Context), |
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287 | .init = vp5_decode_init, |
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288 | .close = ff_vp56_free, |
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289 | .decode = ff_vp56_decode_frame, |
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290 | .capabilities = CODEC_CAP_DR1, |
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291 | };>2;>=ctx_last;>>><>6;>5;>6;>3;>2;>3;>5;>36;>2;>11;>6;>2;>3;>11;>2;>7;>2;>2;>><>><>2;>><>><> |