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annotate libtwamr/dhf_subst.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents f0496507d409
children
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9beb01439a90 libtwamr: implement DHF check function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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f0496507d409 libtwamr: implement amr_dhf_subst_efr()
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2 * The function implemented in this module is an aid for AMR-EFR interworking:
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
parents: 355
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3 * it is meant to be invoked directly after amr_encode_frame(), it checks
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
parents: 355
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4 * the encoder output for MR122 DHF, and if the generated frame exactly
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
parents: 355
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5 * matches MR122 DHF, it is changed to GSM-EFR DHF.
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9beb01439a90 libtwamr: implement DHF check function
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6 */
9beb01439a90 libtwamr: implement DHF check function
Mychaela Falconia <falcon@freecalypso.org>
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7
9beb01439a90 libtwamr: implement DHF check function
Mychaela Falconia <falcon@freecalypso.org>
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8 #include <stdint.h>
9beb01439a90 libtwamr: implement DHF check function
Mychaela Falconia <falcon@freecalypso.org>
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9 #include <string.h>
9beb01439a90 libtwamr: implement DHF check function
Mychaela Falconia <falcon@freecalypso.org>
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10 #include "tw_amr.h"
9beb01439a90 libtwamr: implement DHF check function
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11
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f0496507d409 libtwamr: implement amr_dhf_subst_efr()
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parents: 355
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12 void amr_dhf_subst_efr(struct amr_param_frame *frame)
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13 {
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f0496507d409 libtwamr: implement amr_dhf_subst_efr()
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parents: 355
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14 if (frame->type != TX_SPEECH_GOOD)
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
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15 return;
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
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16 if (frame->mode != MR122)
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
parents: 355
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17 return;
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
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parents: 355
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18 if (memcmp(frame->param, amr_dhf_mr122, AMR_MAX_PRM * sizeof(int16_t)))
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
parents: 355
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19 return;
f0496507d409 libtwamr: implement amr_dhf_subst_efr()
Mychaela Falconia <falcon@freecalypso.org>
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20 memcpy(frame->param, amr_dhf_gsmefr, AMR_MAX_PRM * sizeof(int16_t));
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21 }