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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * TwinVQ decoder |
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3 | * Copyright (c) 2009 Vitor Sessak |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include |
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23 | #include |
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24 | |||
25 | #include "libavutil/channel_layout.h" |
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26 | #include "avcodec.h" |
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27 | #include "get_bits.h" |
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28 | #include "internal.h" |
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29 | #include "twinvq.h" |
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30 | #include "twinvq_data.h" |
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31 | |||
32 | static const TwinVQModeTab mode_08_08 = { |
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33 | { |
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34 | { 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 }, |
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35 | { 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 }, |
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36 | { 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 } |
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37 | }, |
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38 | 512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40 |
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39 | }; |
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40 | |||
41 | static const TwinVQModeTab mode_11_08 = { |
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42 | { |
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43 | { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 }, |
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44 | { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 }, |
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45 | { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 } |
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46 | }, |
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47 | 512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 |
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48 | }; |
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49 | |||
50 | static const TwinVQModeTab mode_11_10 = { |
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51 | { |
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52 | { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 }, |
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53 | { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 }, |
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54 | { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 } |
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55 | }, |
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56 | 512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 |
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57 | }; |
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58 | |||
59 | static const TwinVQModeTab mode_16_16 = { |
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60 | { |
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61 | { 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 }, |
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62 | { 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 }, |
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63 | { 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 } |
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64 | }, |
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65 | 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180 |
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66 | }; |
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67 | |||
68 | static const TwinVQModeTab mode_22_20 = { |
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69 | { |
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70 | { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 }, |
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71 | { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 }, |
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72 | { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 } |
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73 | }, |
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74 | 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 |
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75 | }; |
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76 | |||
77 | static const TwinVQModeTab mode_22_24 = { |
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78 | { |
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79 | { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 }, |
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80 | { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 }, |
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81 | { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 } |
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82 | }, |
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83 | 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 |
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84 | }; |
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85 | |||
86 | static const TwinVQModeTab mode_22_32 = { |
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87 | { |
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88 | { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 }, |
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89 | { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 }, |
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90 | { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 } |
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91 | }, |
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92 | 512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72 |
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93 | }; |
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94 | |||
95 | static const TwinVQModeTab mode_44_40 = { |
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96 | { |
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97 | { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 }, |
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98 | { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 }, |
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99 | { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 } |
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100 | }, |
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101 | 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 |
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102 | }; |
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103 | |||
104 | static const TwinVQModeTab mode_44_48 = { |
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105 | { |
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106 | { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 }, |
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107 | { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 }, |
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108 | { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 } |
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109 | }, |
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110 | 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 |
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111 | }; |
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112 | |||
113 | /** |
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114 | * Evaluate a * b / 400 rounded to the nearest integer. When, for example, |
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115 | * a * b == 200 and the nearest integer is ill-defined, use a table to emulate |
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116 | * the following broken float-based implementation used by the binary decoder: |
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117 | * |
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118 | * @code |
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119 | * static int very_broken_op(int a, int b) |
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120 | * { |
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121 | * static float test; // Ugh, force gcc to do the division first... |
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122 | * |
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123 | * test = a / 400.0; |
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124 | * return b * test + 0.5; |
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125 | * } |
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126 | * @endcode |
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127 | * |
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128 | * @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the |
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129 | * stddev between the original file (before encoding with Yamaha encoder) and |
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130 | * the decoded output increases, which leads one to believe that the encoder |
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131 | * expects exactly this broken calculation. |
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132 | */ |
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133 | static int very_broken_op(int a, int b) |
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134 | { |
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135 | int x = a * b + 200; |
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136 | int size; |
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137 | const uint8_t *rtab; |
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138 | |||
139 | if (x % 400 || b % 5) |
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140 | return x / 400; |
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141 | |||
142 | x /= 400; |
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143 | |||
144 | size = tabs[b / 5].size; |
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145 | rtab = tabs[b / 5].tab; |
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146 | return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size]; |
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147 | } |
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148 | |||
149 | /** |
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150 | * Sum to data a periodic peak of a given period, width and shape. |
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151 | * |
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152 | * @param period the period of the peak divised by 400.0 |
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153 | */ |
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154 | static void add_peak(int period, int width, const float *shape, |
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155 | float ppc_gain, float *speech, int len) |
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156 | { |
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157 | int i, j; |
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158 | |||
159 | const float *shape_end = shape + len; |
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160 | int center; |
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161 | |||
162 | // First peak centered around zero |
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163 | for (i = 0; i < width / 2; i++) |
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164 | speech[i] += ppc_gain * *shape++; |
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165 | |||
166 | for (i = 1; i < ROUNDED_DIV(len, width); i++) { |
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167 | center = very_broken_op(period, i); |
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168 | for (j = -width / 2; j < (width + 1) / 2; j++) |
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169 | speech[j + center] += ppc_gain * *shape++; |
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170 | } |
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171 | |||
172 | // For the last block, be careful not to go beyond the end of the buffer |
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173 | center = very_broken_op(period, i); |
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174 | for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++) |
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175 | speech[j + center] += ppc_gain * *shape++; |
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176 | } |
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177 | |||
178 | static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef, |
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179 | const float *shape, float *speech) |
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180 | { |
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181 | const TwinVQModeTab *mtab = tctx->mtab; |
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182 | int isampf = tctx->avctx->sample_rate / 1000; |
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183 | int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels); |
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184 | int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf); |
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185 | int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf); |
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186 | int period_range = max_period - min_period; |
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187 | float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1); |
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188 | float ppc_gain = 1.0 / 8192 * |
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189 | twinvq_mulawinv(pgain_step * g_coef + |
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190 | pgain_step / 2, |
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191 | 25000.0, TWINVQ_PGAIN_MU); |
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192 | |||
193 | // This is actually the period multiplied by 400. It is just linearly coded |
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194 | // between its maximum and minimum value. |
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195 | int period = min_period + |
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196 | ROUNDED_DIV(period_coef * period_range, |
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197 | (1 << mtab->ppc_period_bit) - 1); |
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198 | int width; |
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199 | |||
200 | if (isampf == 22 && ibps == 32) { |
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201 | // For some unknown reason, NTT decided to code this case differently... |
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202 | width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid, |
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203 | 400 * mtab->size); |
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204 | } else |
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205 | width = period * mtab->peak_per2wid / (400 * mtab->size); |
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206 | |||
207 | add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len); |
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208 | } |
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209 | |||
210 | static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist, |
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211 | int ch, float *out, float gain, |
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212 | enum TwinVQFrameType ftype) |
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213 | { |
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214 | const TwinVQModeTab *mtab = tctx->mtab; |
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215 | int i, j; |
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216 | float *hist = tctx->bark_hist[ftype][ch]; |
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217 | float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype]; |
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218 | int bark_n_coef = mtab->fmode[ftype].bark_n_coef; |
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219 | int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; |
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220 | int idx = 0; |
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221 | |||
222 | for (i = 0; i < fw_cb_len; i++) |
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223 | for (j = 0; j < bark_n_coef; j++, idx++) { |
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224 | float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] * |
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225 | (1.0 / 4096); |
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226 | float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 |
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227 | : tmp2 + 1.0; |
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228 | |||
229 | hist[idx] = tmp2; |
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230 | if (st < -1.0) |
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231 | st = 1.0; |
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232 | |||
233 | twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]); |
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234 | out += mtab->fmode[ftype].bark_tab[idx]; |
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235 | } |
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236 | } |
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237 | |||
238 | static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb, |
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239 | uint8_t *dst, enum TwinVQFrameType ftype) |
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240 | { |
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241 | int i; |
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242 | |||
243 | for (i = 0; i < tctx->n_div[ftype]; i++) { |
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244 | int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]); |
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245 | |||
246 | *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]); |
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247 | *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]); |
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248 | } |
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249 | } |
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250 | |||
251 | static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, |
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252 | const uint8_t *buf, int buf_size) |
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253 | { |
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254 | TwinVQFrameData *bits = &tctx->bits; |
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255 | const TwinVQModeTab *mtab = tctx->mtab; |
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256 | int channels = tctx->avctx->channels; |
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257 | int sub; |
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258 | GetBitContext gb; |
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259 | int i, j, k; |
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260 | |||
261 | init_get_bits(&gb, buf, buf_size * 8); |
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262 | skip_bits(&gb, get_bits(&gb, 8)); |
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263 | |||
264 | bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); |
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265 | |||
266 | if (bits->window_type > 8) { |
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267 | av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); |
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268 | return AVERROR_INVALIDDATA; |
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269 | } |
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270 | |||
271 | bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits.window_type]; |
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272 | |||
273 | sub = mtab->fmode[bits->ftype].sub; |
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274 | |||
275 | read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); |
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276 | |||
277 | for (i = 0; i < channels; i++) |
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278 | for (j = 0; j < sub; j++) |
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279 | for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) |
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280 | bits->bark1[i][j][k] = |
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281 | get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); |
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282 | |||
283 | for (i = 0; i < channels; i++) |
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284 | for (j = 0; j < sub; j++) |
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285 | bits->bark_use_hist[i][j] = get_bits1(&gb); |
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286 | |||
287 | if (bits->ftype == TWINVQ_FT_LONG) { |
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288 | for (i = 0; i < channels; i++) |
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289 | bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
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290 | } else { |
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291 | for (i = 0; i < channels; i++) { |
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292 | bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
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293 | for (j = 0; j < sub; j++) |
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294 | bits->sub_gain_bits[i * sub + j] = get_bits(&gb, |
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295 | TWINVQ_SUB_GAIN_BITS); |
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296 | } |
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297 | } |
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298 | |||
299 | for (i = 0; i < channels; i++) { |
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300 | bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); |
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301 | bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); |
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302 | |||
303 | for (j = 0; j < mtab->lsp_split; j++) |
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304 | bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); |
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305 | } |
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306 | |||
307 | if (bits->ftype == TWINVQ_FT_LONG) { |
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308 | read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); |
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309 | for (i = 0; i < channels; i++) { |
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310 | bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); |
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311 | bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); |
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312 | } |
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313 | } |
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314 | |||
315 | return (get_bits_count(&gb) + 7) / 8; |
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316 | } |
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317 | |||
318 | static av_cold int twinvq_decode_init(AVCodecContext *avctx) |
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319 | { |
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320 | int isampf, ibps; |
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321 | TwinVQContext *tctx = avctx->priv_data; |
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322 | |||
323 | if (!avctx->extradata || avctx->extradata_size < 12) { |
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324 | av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); |
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325 | return AVERROR_INVALIDDATA; |
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326 | } |
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327 | avctx->channels = AV_RB32(avctx->extradata) + 1; |
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328 | avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000; |
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329 | isampf = AV_RB32(avctx->extradata + 8); |
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330 | |||
331 | if (isampf < 8 || isampf > 44) { |
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332 | av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n"); |
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333 | return AVERROR_INVALIDDATA; |
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334 | } |
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335 | switch (isampf) { |
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336 | case 44: |
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337 | avctx->sample_rate = 44100; |
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338 | break; |
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339 | case 22: |
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340 | avctx->sample_rate = 22050; |
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341 | break; |
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342 | case 11: |
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343 | avctx->sample_rate = 11025; |
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344 | break; |
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345 | default: |
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346 | avctx->sample_rate = isampf * 1000; |
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347 | break; |
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348 | } |
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349 | |||
350 | if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { |
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351 | av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", |
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352 | avctx->channels); |
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353 | return -1; |
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354 | } |
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355 | avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO |
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356 | : AV_CH_LAYOUT_STEREO; |
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357 | |||
358 | ibps = avctx->bit_rate / (1000 * avctx->channels); |
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359 | if (ibps < 8 || ibps > 48) { |
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360 | av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps); |
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361 | return AVERROR_INVALIDDATA; |
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362 | } |
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363 | |||
364 | switch ((isampf << 8) + ibps) { |
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365 | case (8 << 8) + 8: |
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366 | tctx->mtab = &mode_08_08; |
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367 | break; |
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368 | case (11 << 8) + 8: |
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369 | tctx->mtab = &mode_11_08; |
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370 | break; |
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371 | case (11 << 8) + 10: |
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372 | tctx->mtab = &mode_11_10; |
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373 | break; |
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374 | case (16 << 8) + 16: |
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375 | tctx->mtab = &mode_16_16; |
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376 | break; |
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377 | case (22 << 8) + 20: |
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378 | tctx->mtab = &mode_22_20; |
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379 | break; |
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380 | case (22 << 8) + 24: |
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381 | tctx->mtab = &mode_22_24; |
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382 | break; |
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383 | case (22 << 8) + 32: |
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384 | tctx->mtab = &mode_22_32; |
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385 | break; |
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386 | case (44 << 8) + 40: |
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387 | tctx->mtab = &mode_44_40; |
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388 | break; |
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389 | case (44 << 8) + 48: |
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390 | tctx->mtab = &mode_44_48; |
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391 | break; |
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392 | default: |
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393 | av_log(avctx, AV_LOG_ERROR, |
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394 | "This version does not support %d kHz - %d kbit/s/ch mode.\n", |
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395 | isampf, isampf); |
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396 | return -1; |
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397 | } |
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398 | |||
399 | avctx->block_align = (avctx->bit_rate * tctx->mtab->size |
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400 | / avctx->sample_rate + 15) / 8; |
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401 | |||
402 | tctx->codec = TWINVQ_CODEC_VQF; |
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403 | tctx->read_bitstream = twinvq_read_bitstream; |
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404 | tctx->dec_bark_env = dec_bark_env; |
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405 | tctx->decode_ppc = decode_ppc; |
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406 | |||
407 | return ff_twinvq_decode_init(avctx); |
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408 | } |
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409 | |||
410 | AVCodec ff_twinvq_decoder = { |
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411 | .name = "twinvq", |
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412 | .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), |
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413 | .type = AVMEDIA_TYPE_AUDIO, |
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414 | .id = AV_CODEC_ID_TWINVQ, |
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415 | .priv_data_size = sizeof(TwinVQContext), |
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416 | .init = twinvq_decode_init, |
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417 | .close = ff_twinvq_decode_close, |
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418 | .decode = ff_twinvq_decode_frame, |
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419 | .capabilities = CODEC_CAP_DR1, |
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420 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
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421 | AV_SAMPLE_FMT_NONE }, |
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422 | };><>><>><>><>><>><>><>><>><>><>>=>>>>>>>>>>>>>>>>>>><>><>>>>>> |