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comparison libgsmfrp/bad_frame.c @ 248:6ac547f0b903

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libgsmfrp: yet another invalid SID logic change, for 1.0.2
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 May 2023 03:48:19 +0000
parents f081a6850fb5
children
comparison
equal deleted inserted replaced
247:56d3fbacd115 248:6ac547f0b903
92 } 92 }
93 } 93 }
94 94
95 void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *st, gsm_byte *frame) 95 void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *st, gsm_byte *frame)
96 { 96 {
97 int mute;
98
97 switch (st->rx_state) { 99 switch (st->rx_state) {
98 case NO_DATA: 100 case NO_DATA:
99 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame)); 101 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame));
100 return; 102 return;
101 case SPEECH: 103 case SPEECH:
103 * Make CN out of the last good speech frame, following the 105 * Make CN out of the last good speech frame, following the
104 * "NOTE" at the end of section 6.1.2 in TS 46.031. 106 * "NOTE" at the end of section 6.1.2 in TS 46.031.
105 */ 107 */
106 st->rx_state = COMFORT_NOISE; 108 st->rx_state = COMFORT_NOISE;
107 memcpy(st->sid_prefix, &st->speech_frame, 5); 109 memcpy(st->sid_prefix, &st->speech_frame, 5);
108 st->sid_xmaxc = ((st->speech_frame[27] & 0x1F) << 1) | 110 st->sid_xmaxc = gsmfr_preproc_xmaxc_mean(st->speech_frame);
109 (st->speech_frame[28] >> 7);
110 gsmfr_preproc_gen_cn(st, frame); 111 gsmfr_preproc_gen_cn(st, frame);
111 return; 112 return;
112 case SPEECH_MUTING: 113 case SPEECH_MUTING:
113 /* same as above, but set the state to CN_MUTING */ 114 /* ignore invalid SID in this state and act as if we got BFI */
114 st->rx_state = CN_MUTING; 115 mute = reduce_xmaxc(st->speech_frame);
115 memcpy(st->sid_prefix, &st->speech_frame, 5); 116 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
116 st->sid_xmaxc = ((st->speech_frame[27] & 0x1F) << 1) | 117 random_grid_pos(st, frame);
117 (st->speech_frame[28] >> 7); 118 if (mute)
118 gsmfr_preproc_gen_cn(st, frame); 119 st->rx_state = NO_DATA;
119 return; 120 return;
120 case COMFORT_NOISE: 121 case COMFORT_NOISE:
121 case LOST_SID: 122 case LOST_SID:
122 st->rx_state = COMFORT_NOISE; 123 st->rx_state = COMFORT_NOISE;
123 gsmfr_preproc_gen_cn(st, frame); 124 gsmfr_preproc_gen_cn(st, frame);