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annotate libgsmfr2/pp_state.h @ 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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1 /*
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2 * This header file is internal to libgsmfr2;
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3 * here we define our state structure for the Rx DTX preprocessor component.
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4 */
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5
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6 enum rx_dtx_st {
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7 NO_DATA = 0,
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8 SPEECH,
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9 SPEECH_MUTING,
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10 COMFORT_NOISE,
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11 LOST_SID,
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12 CN_MUTING,
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13 };
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15 struct gsmfr_preproc_state {
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16 enum rx_dtx_st rx_state;
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17 uint8_t speech_frame[GSMFR_RTP_FRAME_LEN];
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18 uint8_t sid_prefix[5];
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19 uint8_t sid_xmaxc;
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20 uint32_t cn_random_lfsr;
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21 uint8_t cn_random_6fold;
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22 uint8_t dtxd_nodata_count;
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23 uint8_t dtxd_sid_flag;
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24 };
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26 /* we use the same LFSR PRNG for CN as ETSI EFR implementation */
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27 #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */