[956] | 1 | //roarsin.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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| 5 | * |
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| 6 | * This file is part of roarclients 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 | * RoarAudio 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include <math.h> /* sin() */ |
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| 26 | #include <stdio.h> /* *printf*() */ |
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| 27 | #include <roaraudio.h> /* libroar */ |
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| 28 | #include <libroardsp/libroardsp.h> |
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| 29 | |
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| 30 | int main (void) { |
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| 31 | int rate = ROAR_RATE_DEFAULT; |
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| 32 | int bits = 16; |
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| 33 | int channels = 1; /* mono */ |
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| 34 | int codec = ROAR_CODEC_DEFAULT; |
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| 35 | float freq = 523.2; /* middle C */ |
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| 36 | float step; // = M_PI*2*freq/rate; /* how much time per sample we have to encode ... */ |
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| 37 | float t = 0; /* current time */ |
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| 38 | float length = 5; /* 5 sec */ |
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| 39 | int16_t amp = 32767; |
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| 40 | int i; |
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| 41 | int32_t tmp; |
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| 42 | int16_t out[1024]; |
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| 43 | int16_t maxval, maxval_in; |
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| 44 | uint32_t sc, sc_tot = 0; |
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| 45 | int count = 0; |
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| 46 | float rms, rms_in = amp/sqrt(2); |
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| 47 | struct roardsp_filterchain fc[1]; |
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| 48 | struct roardsp_filter filt[3]; |
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| 49 | struct roar_stream stream[1]; |
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| 50 | |
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| 51 | if ( roar_stream_new(stream, rate, channels, bits, codec) == -1 ) |
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| 52 | return 2; |
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| 53 | |
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| 54 | if ( roardsp_filter_init(filt, stream, ROARDSP_FILTER_LOWP) == -1 ) { |
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| 55 | ROAR_ERR("main(*): roardsp_filter_init() failed: errno=%s(%i)", strerror(errno), errno); |
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| 56 | return 1; |
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| 57 | } |
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| 58 | |
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| 59 | freq = 1000; |
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| 60 | roardsp_filter_ctl(filt, ROARDSP_FCTL_FREQ, &freq); |
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| 61 | |
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| 62 | if ( roardsp_filter_init(filt+1, stream, ROARDSP_FILTER_HIGHP) == -1 ) { |
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| 63 | ROAR_ERR("main(*): roardsp_filter_init() failed: errno=%s(%i)", strerror(errno), errno); |
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| 64 | return 1; |
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| 65 | } |
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| 66 | |
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| 67 | freq = 1000; |
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| 68 | roardsp_filter_ctl(filt+1, ROARDSP_FCTL_FREQ, &freq); |
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| 69 | |
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| 70 | if ( roardsp_filter_init(filt+2, stream, ROARDSP_FILTER_AMP) == -1 ) { |
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| 71 | ROAR_ERR("main(*): roardsp_filter_init() failed: errno=%s(%i)", strerror(errno), errno); |
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| 72 | return 1; |
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| 73 | } |
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| 74 | |
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| 75 | tmp = 2; |
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| 76 | roardsp_filter_ctl(filt+2, ROARDSP_FCTL_DIV, &tmp); |
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| 77 | tmp = 3; |
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| 78 | roardsp_filter_ctl(filt+2, ROARDSP_FCTL_MUL, &tmp); |
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| 79 | |
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| 80 | |
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| 81 | roardsp_fchain_init(fc); |
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| 82 | roardsp_fchain_add(fc, filt); |
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| 83 | // roardsp_fchain_add(fc, filt+1); |
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| 84 | // roardsp_fchain_add(fc, filt+2); |
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| 85 | |
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| 86 | fprintf(stderr, "Starting analysis in frequency domain...\n"); |
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| 87 | |
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| 88 | for (freq = 1/* 2*exp(1) */; freq < (float)rate/2; freq *= (1+exp(1)/100), length /= (1+exp(1)/100)) { |
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| 89 | step = M_PI*2*freq/rate; |
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| 90 | maxval = -amp; |
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| 91 | maxval_in = -amp; |
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| 92 | sc = 0; |
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| 93 | rms = 0; |
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| 94 | t = 0; |
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| 95 | |
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| 96 | while (t < 2*M_PI*freq*length) { |
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| 97 | for (i = 0; i < 1024; i++) { |
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| 98 | out[i] = amp*sin(t); |
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| 99 | if ( out[i] > maxval_in ) |
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| 100 | maxval_in = out[i]; |
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| 101 | t += step; |
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| 102 | } |
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| 103 | |
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| 104 | roardsp_fchain_calc(fc, out, 1024); |
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| 105 | |
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| 106 | for (i = 0; i < 1024; i++) { |
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| 107 | sc++; |
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| 108 | rms += out[i] * out[i]; |
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| 109 | if ( out[i] > maxval ) |
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| 110 | maxval = out[i]; |
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| 111 | } |
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| 112 | } |
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| 113 | |
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| 114 | count++; |
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| 115 | sc_tot += sc; |
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| 116 | |
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| 117 | rms /= sc; |
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| 118 | rms = sqrt(rms); |
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| 119 | // rms /= amp; |
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| 120 | rms /= rms_in; |
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| 121 | |
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| 122 | printf("%f: %f %u %f\n", freq, (float)maxval/maxval_in, sc, rms); |
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| 123 | } |
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| 124 | |
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| 125 | fprintf(stderr, "Finished analysis in frequency domain: done tests on a total of %u samples on %i frequencies\n", |
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| 126 | sc_tot, count); |
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| 127 | |
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| 128 | roardsp_fchain_uninit(fc); |
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| 129 | |
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| 130 | return 0; |
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| 131 | } |
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| 132 | |
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| 133 | //ll |
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