FreeCalypso > hg > freecalypso-tools

annotate ringtools/imy/durations.c @ 965:2969032bdfac

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fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Sep 2023 07:33:51 +0000
parents fd4c9bc7835d
children
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1 /*
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2 * This module implements the step of precomputing various note durations
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3 * in TDMA frames.
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4 */
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5
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6 extern unsigned beats_per_min;
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7 unsigned tdma_durations[6][4];
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8
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9 static float modifier_values[4] = {1.0f, 1.5f, 1.75f, 2.0f / 3.0f};
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10
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11 compute_note_durations()
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12 {
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13 float beat_ref, basic_ms[6], dur_ms;
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14 unsigned dur_tdma;
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15 int i, j;
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16
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17 beat_ref = 60000.0f / beats_per_min;
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18 basic_ms[0] = beat_ref * 4.0f;
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19 basic_ms[1] = beat_ref * 2.0f;
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20 basic_ms[2] = beat_ref;
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21 basic_ms[3] = beat_ref / 2.0f;
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22 basic_ms[4] = beat_ref / 4.0f;
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23 basic_ms[5] = beat_ref / 8.0f;
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24 for (i = 0; i < 6; i++) {
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25 for (j = 0; j < 4; j++) {
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26 dur_ms = basic_ms[i] * modifier_values[j];
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27 dur_tdma = dur_ms * 13.0f / 60.0f + 0.5f;
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28 tdma_durations[i][j] = dur_tdma;
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29 }
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30 }
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31 }