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annotate libgsmefr/sid_insert.c @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents b4db5366b595
children
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b4db5366b595 libgsmefr: implement SID code word insertion
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * EFR_insert_sid_codeword() inserts the 95 bit wide SID codeword into
b4db5366b595 libgsmefr: implement SID code word insertion
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3 * an EFR frame in RTP encoding, normally as part of EFR_encode_frame()
b4db5366b595 libgsmefr: implement SID code word insertion
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4 * processing right after EFR_params2frame().
b4db5366b595 libgsmefr: implement SID code word insertion
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5 */
b4db5366b595 libgsmefr: implement SID code word insertion
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6
b4db5366b595 libgsmefr: implement SID code word insertion
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7 #include "gsm_efr.h"
b4db5366b595 libgsmefr: implement SID code word insertion
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8
b4db5366b595 libgsmefr: implement SID code word insertion
Mychaela Falconia <falcon@freecalypso.org>
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9 void EFR_insert_sid_codeword(uint8_t *frame)
b4db5366b595 libgsmefr: implement SID code word insertion
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10 {
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11 frame[6] |= 0x6F;
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12 frame[7] = 0xFF;
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13 frame[8] = 0xFF;
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14 frame[9] |= 0x80;
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15 frame[12] |= 0x3B;
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16 frame[13] = 0xFF;
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17 frame[14] = 0xFF;
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18 frame[15] |= 0xE0;
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19 frame[19] = 0xFF;
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20 frame[20] = 0xFF;
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21 frame[21] = 0xFF;
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22 frame[25] = 0xFF;
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23 frame[26] |= 0xFC;
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24 frame[27] = 0xFF;
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25 frame[28] |= 0xC0;
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26 }