1 | //mixer.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2010 |
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5 | * |
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6 | * This file is part of libroardsp a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroardsp is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | */ |
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25 | |
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26 | #include "libroardsp.h" |
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27 | |
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28 | int roar_mix_pcm (void * output, int bits, void ** input, int samples) { |
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29 | switch (bits) { |
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30 | case 8: return roar_mix_pcm_8bit (output, (int8_t **)input, samples); break; |
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31 | case 16: return roar_mix_pcm_16bit(output, (int16_t **)input, samples); break; |
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32 | case 24: return roar_mix_pcm_24bit(output, input, samples); break; |
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33 | case 32: return roar_mix_pcm_32bit(output, (int32_t **)input, samples); break; |
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34 | default: return -1; |
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35 | } |
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36 | } |
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37 | |
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38 | int roar_mix_pcm_8bit (int8_t * output, int8_t ** input, int samples) { |
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39 | int i, s; |
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40 | register int c; |
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41 | |
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42 | for (s = 0; s < samples; s++) { |
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43 | c = 0; |
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44 | |
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45 | for (i = 0; input[i] != NULL; i++) |
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46 | c += input[i][s]; |
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47 | |
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48 | if ( c > 127 ) |
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49 | c = 127; |
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50 | else if ( c < -128 ) |
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51 | c = -128; |
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52 | output[s] = (char)c; |
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53 | } |
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54 | |
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55 | return 0; |
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56 | } |
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57 | |
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58 | int roar_mix_pcm_16bit (int16_t * output, int16_t ** input, int samples) { |
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59 | int i, s; |
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60 | register int_least32_t c; |
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61 | |
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62 | #ifdef DEBUG |
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63 | for (i = 0; input[i] != NULL; i++) |
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64 | ROAR_DBG("mix_clients_16bit(*): input[%i] = %p", i, input[i]); |
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65 | #endif |
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66 | |
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67 | for (s = 0; s < samples; s++) { |
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68 | c = 0; |
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69 | for (i = 0; input[i] != NULL; i++) { |
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70 | c += input[i][s]; |
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71 | } |
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72 | |
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73 | if ( c > 32767 ) |
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74 | c = 32767; |
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75 | else if ( c < -32768 ) |
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76 | c = -32768; |
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77 | |
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78 | output[s] = c; |
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79 | } |
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80 | |
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81 | return 0; |
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82 | } |
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83 | |
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84 | int roar_mix_pcm_24bit (void * output, void ** input, int samples) { |
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85 | return -1; |
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86 | } |
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87 | |
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88 | int roar_mix_pcm_32bit (int32_t * output, int32_t ** input, int samples) { |
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89 | #ifdef ROAR_NATIVE_INT64 |
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90 | int i, s; |
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91 | ROAR_NATIVE_INT64 c; |
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92 | |
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93 | for (s = 0; s < samples; s++) { |
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94 | c = 0; |
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95 | |
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96 | for (i = 0; input[i]; i++) |
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97 | c += input[i][s]; |
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98 | |
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99 | if ( c > 21474836487LL ) |
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100 | c = 2147483647LL; |
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101 | else if ( c < -2147483648LL ) |
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102 | c = -2147483648LL; |
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103 | output[s] = (int32_t)c; |
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104 | } |
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105 | |
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106 | return 0; |
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107 | #else |
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108 | return -1; |
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109 | #endif |
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110 | } |
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111 | |
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112 | |
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113 | //ll |
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