[4129] | 1 | //resampler_poly3.c: |
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| 2 | |
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| 3 | /* |
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[5823] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2013 |
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[4129] | 5 | * Copyright (C) Hans-Kristian 'maister' Arntzen - 2010 |
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| 6 | * |
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| 7 | * This file is part of libroar a part of RoarAudio, |
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| 8 | * a cross-platform sound system for both, home and professional use. |
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| 9 | * See README for details. |
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| 10 | * |
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| 11 | * This file is free software; you can redistribute it and/or modify |
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| 12 | * it under the terms of the GNU General Public License version 3 |
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| 13 | * as published by the Free Software Foundation. |
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| 14 | * |
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| 15 | * libroar is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | * GNU General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with this software; see the file COPYING. If not, write to |
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| 22 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 23 | * Boston, MA 02110-1301, USA. |
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| 24 | * |
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| 25 | * NOTE for everyone want's to change something and send patches: |
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| 26 | * read README and HACKING! There a addition information on |
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| 27 | * the license of this document you need to read before you send |
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| 28 | * any patches. |
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| 29 | * |
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| 30 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 31 | * or libpulse*: |
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| 32 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 33 | * and are therefore GPL. Because of this it may be illigal to use |
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| 34 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 35 | */ |
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| 36 | |
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| 37 | #include "libroardsp.h" |
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| 38 | |
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| 39 | int roar_conv_poly3_8 (int8_t * out, int8_t * in, size_t olen, size_t ilen, int channels) { |
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| 40 | float ratio = (float)olen / (float)ilen; |
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| 41 | int8_t *ip; |
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| 42 | int c, x; |
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| 43 | float pos_in; |
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| 44 | float poly[3]; |
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| 45 | float y[3]; |
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| 46 | float x_val; |
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| 47 | int_least16_t temp; |
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| 48 | |
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| 49 | /* Can't create poly out of less than 3 samples in each channel. */ |
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| 50 | if ( ilen < 3 * channels ) |
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| 51 | return -1; |
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| 52 | |
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| 53 | ip = roar_mm_malloc(ilen * sizeof(int8_t)); |
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| 54 | if ( ip == NULL ) |
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| 55 | return -1; |
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| 56 | |
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| 57 | memcpy(ip, in, ilen * sizeof(int8_t)); |
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| 58 | |
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| 59 | olen /= channels; |
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| 60 | |
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| 61 | for (x = 0; x < olen; x++) { |
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| 62 | for (c = 0; c < channels; c++) { |
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| 63 | pos_in = (float)x / ratio; |
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| 64 | |
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| 65 | if ( (int)pos_in == 0 ) { |
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| 66 | y[0] = ip[0 * channels + c]; |
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| 67 | y[1] = ip[1 * channels + c]; |
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| 68 | y[2] = ip[2 * channels + c]; |
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| 69 | x_val = pos_in; |
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| 70 | roar_math_mkpoly_3x3(poly, y); |
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| 71 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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| 72 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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| 73 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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| 74 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 75 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 76 | |
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| 77 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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| 78 | roar_math_mkpoly_2x2(poly, y); |
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| 79 | poly[2] = 0; |
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| 80 | x_val = pos_in - (int)pos_in + 1.0; |
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| 81 | } else { |
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| 82 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 83 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 84 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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| 85 | x_val = pos_in - (int)pos_in + 1.0; |
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| 86 | roar_math_mkpoly_3x3(poly, y); |
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| 87 | } |
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| 88 | |
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| 89 | |
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| 90 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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| 91 | /* temp could be out of bounds, so need to check this */ |
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| 92 | if ( temp > 0x7E ) { |
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| 93 | out[x * channels + c] = 0x7E; |
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| 94 | } else if (temp < -0x7F) { |
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| 95 | out[x * channels + c] = -0x7F; |
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| 96 | } else { |
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| 97 | out[x * channels + c] = (int8_t)temp; |
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| 98 | } |
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| 99 | } |
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| 100 | } |
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| 101 | |
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| 102 | roar_mm_free(ip); |
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| 103 | return 0; |
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| 104 | } |
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| 105 | |
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| 106 | int roar_conv_poly3_16 (int16_t * out, int16_t * in, size_t olen, size_t ilen, int channels) { |
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| 107 | float ratio = (float)olen / (float)ilen; |
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| 108 | int16_t *ip; |
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| 109 | int c, x; |
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| 110 | float pos_in; |
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| 111 | float poly[3]; |
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| 112 | float y[3]; |
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| 113 | float x_val; |
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| 114 | int_least32_t temp; |
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| 115 | |
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| 116 | /* Can't create poly out of less than 3 samples in each channel. */ |
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| 117 | if ( ilen < 3 * channels ) |
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| 118 | return -1; |
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| 119 | |
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| 120 | ip = roar_mm_malloc(ilen * sizeof(int16_t)); |
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| 121 | if ( ip == NULL ) |
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| 122 | return -1; |
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| 123 | |
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| 124 | memcpy(ip, in, ilen * sizeof(int16_t)); |
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| 125 | |
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| 126 | olen /= channels; |
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| 127 | |
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| 128 | for (x = 0; x < olen; x++) { |
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| 129 | for (c = 0; c < channels; c++) { |
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| 130 | pos_in = (float)x / ratio; |
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| 131 | |
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| 132 | if ( (int)pos_in == 0 ) { |
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| 133 | y[0] = ip[0 * channels + c]; |
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| 134 | y[1] = ip[1 * channels + c]; |
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| 135 | y[2] = ip[2 * channels + c]; |
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| 136 | x_val = pos_in; |
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| 137 | roar_math_mkpoly_3x3(poly, y); |
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| 138 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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| 139 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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| 140 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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| 141 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 142 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 143 | |
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| 144 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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| 145 | roar_math_mkpoly_2x2(poly, y); |
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| 146 | poly[2] = 0; |
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| 147 | x_val = pos_in - (int)pos_in + 1.0; |
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| 148 | } else { |
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| 149 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 150 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 151 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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| 152 | x_val = pos_in - (int)pos_in + 1.0; |
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| 153 | roar_math_mkpoly_3x3(poly, y); |
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| 154 | } |
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| 155 | |
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| 156 | |
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| 157 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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| 158 | /* temp could be out of bounds, so need to check this */ |
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| 159 | if (temp > 0x7FFE ) { |
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| 160 | out[x * channels + c] = 0x7FFE; |
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| 161 | } else if (temp < -0x7FFF) { |
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| 162 | out[x * channels + c] = -0x7FFF; |
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| 163 | } else { |
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| 164 | out[x * channels + c] = (int16_t)temp; |
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| 165 | } |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | roar_mm_free(ip); |
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| 170 | return 0; |
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| 171 | } |
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| 172 | |
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| 173 | int roar_conv_poly3_32 (int32_t * out, int32_t * in, size_t olen, size_t ilen, int channels) { |
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| 174 | float ratio = (float)olen / (float)ilen; |
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| 175 | int32_t *ip; |
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| 176 | int c, x; |
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| 177 | float pos_in; |
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| 178 | float poly[3]; |
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| 179 | float y[3]; |
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| 180 | float x_val; |
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| 181 | int_least64_t temp; |
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| 182 | |
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| 183 | /* Can't create poly out of less than 3 samples in each channel. */ |
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| 184 | if ( ilen < 3 * channels ) |
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| 185 | return -1; |
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| 186 | |
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| 187 | ip = roar_mm_malloc(ilen * sizeof(int32_t)); |
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| 188 | if ( ip == NULL ) |
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| 189 | return -1; |
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| 190 | |
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| 191 | memcpy(ip, in, ilen * sizeof(int32_t)); |
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| 192 | |
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| 193 | olen /= channels; |
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| 194 | |
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| 195 | for (x = 0; x < olen; x++) { |
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| 196 | for (c = 0; c < channels; c++) { |
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| 197 | pos_in = (float)x / ratio; |
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| 198 | |
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| 199 | if ( (int)pos_in == 0 ) { |
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| 200 | y[0] = ip[0 * channels + c]; |
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| 201 | y[1] = ip[1 * channels + c]; |
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| 202 | y[2] = ip[2 * channels + c]; |
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| 203 | x_val = pos_in; |
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| 204 | roar_math_mkpoly_3x3(poly, y); |
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| 205 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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| 206 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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| 207 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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| 208 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 209 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 210 | |
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| 211 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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| 212 | roar_math_mkpoly_2x2(poly, y); |
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| 213 | poly[2] = 0; |
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| 214 | x_val = pos_in - (int)pos_in + 1.0; |
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| 215 | } else { |
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| 216 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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| 217 | y[1] = ip[((int)pos_in ) * channels + c]; |
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| 218 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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| 219 | x_val = pos_in - (int)pos_in + 1.0; |
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| 220 | roar_math_mkpoly_3x3(poly, y); |
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| 221 | } |
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| 222 | |
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| 223 | |
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| 224 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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| 225 | /* temp could be out of bounds, so need to check this */ |
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| 226 | if ( temp > 0x7FFFFFFE ) { |
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| 227 | out[x * channels + c] = 0x7FFFFFFE; |
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| 228 | } else if (temp < -0x7FFFFFFF) { |
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| 229 | out[x * channels + c] = -0x7FFFFFFF; |
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| 230 | } else { |
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| 231 | out[x * channels + c] = (int32_t)temp; |
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| 232 | } |
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| 233 | } |
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| 234 | } |
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| 235 | |
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| 236 | roar_mm_free(ip); |
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| 237 | return 0; |
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| 238 | } |
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| 239 | |
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