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4349 | Serge | 1 | /* |
2 | * RV30/40 decoder common dsp functions |
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3 | * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov |
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4 | * Copyright (c) 2011 Janne Grunau |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | /** |
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24 | * @file |
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25 | * RV30/40 decoder common dsp functions |
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26 | */ |
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27 | |||
28 | #include "rv34dsp.h" |
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29 | #include "libavutil/common.h" |
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30 | |||
31 | /** |
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32 | * @name RV30/40 inverse transform functions |
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33 | * @{ |
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34 | */ |
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35 | |||
36 | static av_always_inline void rv34_row_transform(int temp[16], int16_t *block) |
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37 | { |
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38 | int i; |
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39 | |||
40 | for(i = 0; i < 4; i++){ |
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41 | const int z0 = 13*(block[i+4*0] + block[i+4*2]); |
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42 | const int z1 = 13*(block[i+4*0] - block[i+4*2]); |
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43 | const int z2 = 7* block[i+4*1] - 17*block[i+4*3]; |
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44 | const int z3 = 17* block[i+4*1] + 7*block[i+4*3]; |
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45 | |||
46 | temp[4*i+0] = z0 + z3; |
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47 | temp[4*i+1] = z1 + z2; |
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48 | temp[4*i+2] = z1 - z2; |
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49 | temp[4*i+3] = z0 - z3; |
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50 | } |
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51 | } |
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52 | |||
53 | /** |
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54 | * Real Video 3.0/4.0 inverse transform + sample reconstruction |
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55 | * Code is almost the same as in SVQ3, only scaling is different. |
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56 | */ |
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57 | static void rv34_idct_add_c(uint8_t *dst, ptrdiff_t stride, int16_t *block){ |
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58 | int temp[16]; |
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59 | int i; |
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60 | |||
61 | rv34_row_transform(temp, block); |
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62 | memset(block, 0, 16*sizeof(int16_t)); |
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63 | |||
64 | for(i = 0; i < 4; i++){ |
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65 | const int z0 = 13*(temp[4*0+i] + temp[4*2+i]) + 0x200; |
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66 | const int z1 = 13*(temp[4*0+i] - temp[4*2+i]) + 0x200; |
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67 | const int z2 = 7* temp[4*1+i] - 17*temp[4*3+i]; |
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68 | const int z3 = 17* temp[4*1+i] + 7*temp[4*3+i]; |
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69 | |||
70 | dst[0] = av_clip_uint8( dst[0] + ( (z0 + z3) >> 10 ) ); |
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71 | dst[1] = av_clip_uint8( dst[1] + ( (z1 + z2) >> 10 ) ); |
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72 | dst[2] = av_clip_uint8( dst[2] + ( (z1 - z2) >> 10 ) ); |
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73 | dst[3] = av_clip_uint8( dst[3] + ( (z0 - z3) >> 10 ) ); |
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74 | |||
75 | dst += stride; |
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76 | } |
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77 | } |
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78 | |||
79 | /** |
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80 | * RealVideo 3.0/4.0 inverse transform for DC block |
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81 | * |
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82 | * Code is almost the same as rv34_inv_transform() |
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83 | * but final coefficients are multiplied by 1.5 and have no rounding. |
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84 | */ |
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85 | static void rv34_inv_transform_noround_c(int16_t *block){ |
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86 | int temp[16]; |
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87 | int i; |
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88 | |||
89 | rv34_row_transform(temp, block); |
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90 | |||
91 | for(i = 0; i < 4; i++){ |
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92 | const int z0 = 39*(temp[4*0+i] + temp[4*2+i]); |
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93 | const int z1 = 39*(temp[4*0+i] - temp[4*2+i]); |
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94 | const int z2 = 21* temp[4*1+i] - 51*temp[4*3+i]; |
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95 | const int z3 = 51* temp[4*1+i] + 21*temp[4*3+i]; |
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96 | |||
97 | block[i*4+0] = (z0 + z3) >> 11; |
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98 | block[i*4+1] = (z1 + z2) >> 11; |
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99 | block[i*4+2] = (z1 - z2) >> 11; |
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100 | block[i*4+3] = (z0 - z3) >> 11; |
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101 | } |
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102 | } |
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103 | |||
104 | static void rv34_idct_dc_add_c(uint8_t *dst, ptrdiff_t stride, int dc) |
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105 | { |
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106 | int i, j; |
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107 | |||
108 | dc = (13*13*dc + 0x200) >> 10; |
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109 | for (i = 0; i < 4; i++) |
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110 | { |
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111 | for (j = 0; j < 4; j++) |
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112 | dst[j] = av_clip_uint8( dst[j] + dc ); |
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113 | |||
114 | dst += stride; |
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115 | } |
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116 | } |
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117 | |||
118 | static void rv34_inv_transform_dc_noround_c(int16_t *block) |
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119 | { |
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120 | int16_t dc = (13 * 13 * 3 * block[0]) >> 11; |
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121 | int i, j; |
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122 | |||
123 | for (i = 0; i < 4; i++, block += 4) |
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124 | for (j = 0; j < 4; j++) |
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125 | block[j] = dc; |
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126 | } |
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127 | |||
128 | /** @} */ // transform |
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129 | |||
130 | |||
131 | av_cold void ff_rv34dsp_init(RV34DSPContext *c) |
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132 | { |
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133 | c->rv34_inv_transform = rv34_inv_transform_noround_c; |
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134 | c->rv34_inv_transform_dc = rv34_inv_transform_dc_noround_c; |
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135 | |||
136 | c->rv34_idct_add = rv34_idct_add_c; |
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137 | c->rv34_idct_dc_add = rv34_idct_dc_add_c; |
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138 | |||
139 | if (ARCH_ARM) |
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140 | ff_rv34dsp_init_arm(c); |
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141 | if (ARCH_X86) |
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142 | ff_rv34dsp_init_x86(c); |
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143 | }>>>>>>> |