FreeCalypso > hg > themwi-system-sw
annotate mgw/dtmf_init.c @ 136:ce02fd05fd9e
liboutrt: implement special number routing
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 06 Oct 2022 23:57:38 -0800 |
parents | 815e4c59162e |
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rev | line source |
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mgw DTMF: tone definitions and sample array generation
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1 /* |
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2 * The code in this module executes once upon themwi-mgw startup; |
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3 * it initializes the arrays of linear PCM samples for DTMF output. |
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4 * |
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5 * The amplitudes of the two sine waves comprising each DTMF tone |
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6 * are also defined here. |
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7 */ |
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8 |
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9 #include <math.h> |
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10 #include <stdio.h> |
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11 #include <stdint.h> |
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12 #include <stdlib.h> |
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13 #include "dtmf_defs.h" |
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14 #include "int_defs.h" |
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15 |
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16 #define DTMF_AMPL_LOW_TONE 5000 |
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17 #define DTMF_AMPL_HIGH_TONE 6000 |
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18 |
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19 extern struct dtmf_desc dtmf_table[]; |
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20 |
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21 static void |
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22 init_one_dtmf(desc) |
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23 struct dtmf_desc *desc; |
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24 { |
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25 float angle_low, angle_high; |
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26 unsigned n; |
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27 int16_t *samp; |
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28 |
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29 angle_low = 0; |
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30 angle_high = 0; |
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31 samp = desc->samples; |
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32 for (n = 0; n < DTMF_MAX_FRAMES * SAMPLES_PER_FRAME; n++) { |
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33 *samp++ = sinf(angle_low) * DTMF_AMPL_LOW_TONE + |
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34 sinf(angle_high) * DTMF_AMPL_HIGH_TONE; |
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35 angle_low += desc->freq_low; |
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36 angle_high += desc->freq_high; |
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37 } |
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38 } |
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39 |
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40 dtmf_init_sample_arrays() |
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41 { |
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42 struct dtmf_desc *desc; |
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43 |
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44 for (desc = dtmf_table; desc->digit; desc++) { |
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45 desc->samples = |
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46 malloc(DTMF_MAX_FRAMES * SAMPLES_PER_FRAME * sizeof(int16_t)); |
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47 if (!desc->samples) { |
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48 perror("malloc for DTMF samples"); |
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49 exit(1); |
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50 } |
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51 init_one_dtmf(desc); |
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52 } |
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53 return 0; |
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54 } |