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annotate pcmu2efr/gen160.c @ 32:baf74dff5368

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dhf: generate hex forms of EFR DHF
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 13 May 2024 06:26:22 +0000
parents f4420403219a
children
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1 /*
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2 * The code in this module generates 160 versions of linearized seqsyncu,
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3 * shifted by one sample each, intended for feeding to EFR and AMR encoders.
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4 *
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5 * Update: the new version generates a linear array of 480 16-bit PCM samples,
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6 * where the first 160 are 0x0008, followed by two copies of linearized
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7 * seqsyncu.
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8 */
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9
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10 #include <stdint.h>
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12 extern const uint8_t seqsyncu_last_frame[160];
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13 extern const uint16_t pcmu_decode_table[256];
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15 uint16_t linear_input_array[480];
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17 void
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18 generate_linear_inputs(void)
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19 {
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20 unsigned n;
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21 uint16_t lin;
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23 for (n = 0; n < 160; n++) {
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24 lin = pcmu_decode_table[seqsyncu_last_frame[n]];
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25 linear_input_array[n] = 0x0008;
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26 linear_input_array[160+n] = lin;
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27 linear_input_array[320+n] = lin;
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28 }
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29 }