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annotate pcma2efr/gen160.c @ 41:4e031007e6dd

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ae-dec-dhf: generate TCH UL input
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 May 2024 08:26:00 +0000
parents 4f47447fd17f
children
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1 /*
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2 * The code in this module generates 160 versions of linearized seqsynca,
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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 * seqsynca.
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8 */
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10 #include <stdint.h>
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12 extern const uint8_t seqsynca_last_frame[160];
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13 extern const uint16_t pcma_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 = pcma_decode_table[seqsynca_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 }