FreeCalypso > hg > freecalypso-tools

annotate ringtools/imy/durations.c @ 904:5041bcb8140f

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tchtools/fc-vm2hex.c: update header comment for new situation
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 08:41:57 +0000
parents fd4c9bc7835d
children
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fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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2 * This module implements the step of precomputing various note durations
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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3 * in TDMA frames.
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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4 */
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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5
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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6 extern unsigned beats_per_min;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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7 unsigned tdma_durations[6][4];
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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8
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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9 static float modifier_values[4] = {1.0f, 1.5f, 1.75f, 2.0f / 3.0f};
fd4c9bc7835d fc-imy2pwt program written, compiles
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10
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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11 compute_note_durations()
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Mychaela Falconia <falcon@freecalypso.org>
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12 {
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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13 float beat_ref, basic_ms[6], dur_ms;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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14 unsigned dur_tdma;
fd4c9bc7835d fc-imy2pwt program written, compiles
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15 int i, j;
fd4c9bc7835d fc-imy2pwt program written, compiles
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16
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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17 beat_ref = 60000.0f / beats_per_min;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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18 basic_ms[0] = beat_ref * 4.0f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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19 basic_ms[1] = beat_ref * 2.0f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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20 basic_ms[2] = beat_ref;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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21 basic_ms[3] = beat_ref / 2.0f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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22 basic_ms[4] = beat_ref / 4.0f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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23 basic_ms[5] = beat_ref / 8.0f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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24 for (i = 0; i < 6; i++) {
fd4c9bc7835d fc-imy2pwt program written, compiles
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25 for (j = 0; j < 4; j++) {
fd4c9bc7835d fc-imy2pwt program written, compiles
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26 dur_ms = basic_ms[i] * modifier_values[j];
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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27 dur_tdma = dur_ms * 13.0f / 60.0f + 0.5f;
fd4c9bc7835d fc-imy2pwt program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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28 tdma_durations[i][j] = dur_tdma;
fd4c9bc7835d fc-imy2pwt program written, compiles
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29 }
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30 }
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31 }