[126] | 1 | //roarfilt.c: |
---|
| 2 | |
---|
[669] | 3 | /* |
---|
| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
---|
| 5 | * |
---|
| 6 | * This file is part of roarclients a part of RoarAudio, |
---|
| 7 | * a cross-platform sound system for both, home and professional use. |
---|
| 8 | * See README for details. |
---|
| 9 | * |
---|
| 10 | * This file is free software; you can redistribute it and/or modify |
---|
| 11 | * it under the terms of the GNU General Public License version 3 |
---|
| 12 | * as published by the Free Software Foundation. |
---|
| 13 | * |
---|
| 14 | * RoarAudio is distributed in the hope that it will be useful, |
---|
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 17 | * GNU General Public License for more details. |
---|
| 18 | * |
---|
| 19 | * You should have received a copy of the GNU General Public License |
---|
| 20 | * along with this software; see the file COPYING. If not, write to |
---|
| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
---|
| 22 | * |
---|
| 23 | */ |
---|
| 24 | |
---|
[126] | 25 | #include <roaraudio.h> |
---|
[130] | 26 | #include <math.h> |
---|
[126] | 27 | |
---|
| 28 | #define BUFSIZE 1024 |
---|
[646] | 29 | struct { |
---|
[648] | 30 | uint16_t a, b; |
---|
| 31 | int16_t old[ROAR_MAX_CHANNELS]; |
---|
[646] | 32 | } g_lowpass; |
---|
[126] | 33 | |
---|
| 34 | void usage (void) { |
---|
[233] | 35 | printf("roarfilt [OPTIONS]...\n"); |
---|
[126] | 36 | |
---|
| 37 | printf("\nOptions:\n\n"); |
---|
| 38 | |
---|
| 39 | printf(" --server SERVER - Set server hostname\n" |
---|
| 40 | " --rate RATE - Set sample rate\n" |
---|
| 41 | " --bits BITS - Set bits per sample\n" |
---|
| 42 | " --chans CHANNELS - Set number of channels\n" |
---|
| 43 | " --help - Show this help\n" |
---|
[128] | 44 | "\n" |
---|
| 45 | " --half - half the volume\n" |
---|
| 46 | " --double - double the volume\n" |
---|
[130] | 47 | " --amp VAL - Set amplification\n" |
---|
| 48 | " --mul VAL - Set mul\n" |
---|
| 49 | " --div VAL - Set div\n" |
---|
[646] | 50 | " --lowpass freq - lowpass filter\n" |
---|
[126] | 51 | ); |
---|
| 52 | |
---|
| 53 | } |
---|
| 54 | |
---|
[128] | 55 | void vol2 (void * data, int mul, int div, int len) { |
---|
| 56 | int16_t * samples = (int16_t *) data; |
---|
| 57 | int i; |
---|
| 58 | |
---|
| 59 | len /= 2; |
---|
| 60 | |
---|
| 61 | for (i = 0; i < len; i++) |
---|
| 62 | samples[i] = ((int) samples[i] * mul) / div; |
---|
| 63 | } |
---|
| 64 | |
---|
| 65 | void vol1 (void * data, int mul, int div, int len) { |
---|
| 66 | int8_t * samples = (int8_t *) data; |
---|
| 67 | int i; |
---|
| 68 | |
---|
[130] | 69 | for (i = 0; i < len; i++) |
---|
| 70 | samples[i] = ((int) samples[i] * mul) / div; |
---|
| 71 | } |
---|
| 72 | |
---|
[140] | 73 | void logs2 (void * data, float scale, int len) { |
---|
[130] | 74 | int16_t * samples = (int16_t *) data; |
---|
| 75 | int i; |
---|
| 76 | float div = logf(scale); |
---|
[140] | 77 | float scalemul = scale - 1; |
---|
[130] | 78 | int neg; |
---|
| 79 | |
---|
[128] | 80 | len /= 2; |
---|
| 81 | |
---|
[140] | 82 | //printf("logs2(data=%p, scale=%f, len=%i): scalemul=%f, div=%f\n", data, scale, len, scalemul, div); |
---|
[130] | 83 | |
---|
| 84 | for (i = 0; i < len; i++) { |
---|
| 85 | if ( (neg = (samples[i] < 0)) ) |
---|
| 86 | samples[i] = abs(samples[i]); |
---|
| 87 | |
---|
| 88 | |
---|
[140] | 89 | samples[i] = (neg ? 32768.0 : 32767.0)*logf(1 + (scalemul*(float)samples[i]/(neg ? 32768.0 : 32767.0))) / div; |
---|
[130] | 90 | |
---|
| 91 | if ( neg ) |
---|
| 92 | samples[i] *= -1; |
---|
| 93 | } |
---|
[128] | 94 | } |
---|
| 95 | |
---|
[646] | 96 | void lowpass2 (void * data, int len, int channels) { |
---|
| 97 | int16_t * samples = (int16_t *) data; |
---|
| 98 | register int32_t s; |
---|
| 99 | int i, c; |
---|
| 100 | |
---|
| 101 | if ( channels > ROAR_MAX_CHANNELS ) |
---|
| 102 | return; |
---|
| 103 | |
---|
| 104 | len /= 2 * channels; |
---|
| 105 | |
---|
| 106 | // * output[N] = input[N] * A + output[N-1] * B |
---|
| 107 | |
---|
| 108 | for (i = 0; i < len; i++) { |
---|
| 109 | for (c = 0; c < channels; c++) { |
---|
| 110 | s = samples[i*channels + c] * g_lowpass.a + g_lowpass.old[c] * g_lowpass.b; |
---|
| 111 | |
---|
| 112 | s /= 65536; |
---|
| 113 | |
---|
| 114 | samples[i*channels + c] = s; |
---|
| 115 | g_lowpass.old[ c] = s; |
---|
| 116 | } |
---|
| 117 | } |
---|
| 118 | } |
---|
| 119 | |
---|
[126] | 120 | int main (int argc, char * argv[]) { |
---|
| 121 | int rate = 44100; |
---|
| 122 | int bits = 16; |
---|
| 123 | int channels = 2; |
---|
| 124 | int codec = ROAR_CODEC_DEFAULT; |
---|
| 125 | char * server = NULL; |
---|
| 126 | char * k; |
---|
| 127 | int fh; |
---|
| 128 | int i; |
---|
[128] | 129 | int mul = 1, div = 1; |
---|
[140] | 130 | float logscale = 0; |
---|
[646] | 131 | float lp = 0; |
---|
[126] | 132 | char buf[BUFSIZE]; |
---|
| 133 | |
---|
[646] | 134 | memset(&g_lowpass, 0, sizeof(g_lowpass)); |
---|
| 135 | |
---|
[126] | 136 | for (i = 1; i < argc; i++) { |
---|
| 137 | k = argv[i]; |
---|
| 138 | |
---|
| 139 | if ( strcmp(k, "--server") == 0 ) { |
---|
| 140 | server = argv[++i]; |
---|
| 141 | } else if ( strcmp(k, "--rate") == 0 ) { |
---|
| 142 | rate = atoi(argv[++i]); |
---|
| 143 | } else if ( strcmp(k, "--bits") == 0 ) { |
---|
| 144 | bits = atoi(argv[++i]); |
---|
| 145 | } else if ( strcmp(k, "--channels") == 0 || strcmp(k, "--chans") == 0 ) { |
---|
| 146 | channels = atoi(argv[++i]); |
---|
[128] | 147 | } else if ( strcmp(k, "--half") == 0 ) { |
---|
| 148 | div *= 2; |
---|
| 149 | } else if ( strcmp(k, "--double") == 0 ) { |
---|
| 150 | mul *= 2; |
---|
[130] | 151 | } else if ( strcmp(k, "--amp") == 0 ) { |
---|
| 152 | mul *= atoi(argv[++i]); |
---|
| 153 | } else if ( strcmp(k, "--mul") == 0 ) { |
---|
| 154 | mul = atoi(argv[++i]); |
---|
| 155 | } else if ( strcmp(k, "--div") == 0 ) { |
---|
| 156 | div = atoi(argv[++i]); |
---|
| 157 | } else if ( strcmp(k, "--log") == 0 ) { |
---|
[140] | 158 | logscale = atof(argv[++i]); |
---|
[646] | 159 | } else if ( strcmp(k, "--lowpass") == 0 ) { |
---|
| 160 | lp = exp(-2 * M_PI * atof(argv[++i]) / rate) * 65536; |
---|
| 161 | g_lowpass.b = lp; |
---|
| 162 | g_lowpass.a = 65536 - lp; |
---|
[648] | 163 | // printf("lowpass: A=%i, B=%i\n", g_lowpass.a, g_lowpass.b); |
---|
[126] | 164 | } else if ( strcmp(k, "--help") == 0 ) { |
---|
| 165 | usage(); |
---|
| 166 | return 0; |
---|
| 167 | } else { |
---|
| 168 | fprintf(stderr, "Error: unknown argument: %s\n", k); |
---|
| 169 | usage(); |
---|
| 170 | return 1; |
---|
| 171 | } |
---|
| 172 | } |
---|
| 173 | |
---|
| 174 | if ( (fh = roar_simple_filter(rate, channels, bits, codec, server, "roarifilt")) == -1 ) { |
---|
| 175 | fprintf(stderr, "Error: can not start playback\n"); |
---|
| 176 | return 1; |
---|
| 177 | } |
---|
| 178 | |
---|
[646] | 179 | if ( mul == div && logscale == 0 && lp == 0 ) { |
---|
[128] | 180 | fprintf(stderr, "Error: filter is useless!\n"); |
---|
| 181 | return 0; |
---|
| 182 | } |
---|
| 183 | |
---|
| 184 | if ( bits == 16 ) { |
---|
| 185 | while((i = read(fh, buf, BUFSIZE))) { |
---|
[130] | 186 | if ( mul != div ) |
---|
| 187 | vol2((void*)buf, mul, div, i); |
---|
| 188 | if ( logscale ) |
---|
| 189 | logs2((void*)buf, logscale, i); |
---|
[646] | 190 | if ( g_lowpass.a ) |
---|
| 191 | lowpass2((void*)buf, i, channels); |
---|
[128] | 192 | if (write(fh, buf, i) != i) |
---|
| 193 | break; |
---|
| 194 | } |
---|
| 195 | } else if ( bits == 8 ) { |
---|
| 196 | while((i = read(fh, buf, BUFSIZE))) { |
---|
| 197 | vol1((void*)buf, mul, div, i); |
---|
| 198 | if (write(fh, buf, i) != i) |
---|
| 199 | break; |
---|
| 200 | } |
---|
| 201 | } else { |
---|
| 202 | fprintf(stderr, "Error: %i bits per sample is not supported!\n", bits); |
---|
| 203 | return 1; |
---|
| 204 | } |
---|
[126] | 205 | |
---|
| 206 | roar_simple_close(fh); |
---|
| 207 | |
---|
| 208 | return 0; |
---|
| 209 | } |
---|
| 210 | |
---|
| 211 | //ll |
---|