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annotate libgsmfr2/pp_good.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 96c4ed5529bf
children
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4812e00bc100 libgsmfrp: implement handling of good frames
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1 /*
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2 * In this module we implement preprocessing of received good frames.
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3 */
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4
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5 #include <stdint.h>
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6 #include <string.h>
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7 #include "tw_gsmfr.h"
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573afa985df6 libgsmfr2: split pp_state.h from pp_internal.h
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8 #include "pp_state.h"
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9 #include "pp_internal.h"
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11 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *st, uint8_t *frame)
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12 {
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13 int sid;
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14
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15 /* always set correct magic */
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16 frame[0] = 0xD0 | frame[0] & 0x0F;
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17 /* now classify by SID */
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18 sid = gsmfr_preproc_sid_classify(frame);
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19 switch (sid) {
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20 case 0: /* good speech frame */
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21 st->rx_state = SPEECH;
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22 st->dtxd_sid_flag = 0;
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23 memcpy(&st->speech_frame, frame, GSMFR_RTP_FRAME_LEN);
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24 return;
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25 case 1: /* invalid SID frame */
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26 /* state-dependent handling, similar to BFI */
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27 gsmfr_preproc_invalid_sid(st, frame);
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28 return;
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29 case 2: /* valid SID frame */
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30 st->rx_state = COMFORT_NOISE;
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31 st->dtxd_sid_flag = 1;
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32 gsmfr_preproc_sid2cn(st, frame);
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33 return;
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34 }
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35 }