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doc/Use-outside-USA: Fake-NANP-numbers article is here
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 Nov 2023 21:49:19 -0800
parents c76f42e0cd3f
children
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c76f42e0cd3f osmo-patches/osmo-bts-rtp-bfi.patch: mark as deprecated
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1 # This osmo-bts patch is out of date and no longer used. The new patch
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2 # we currently run with is located on a private feature branch hosted
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3 # in the official repository:
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4 #
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5 # https://cgit.osmocom.org/osmo-bts/log/?h=falconia/rtp_traulike
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6
172
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7 diff --git a/src/common/l1sap.c b/src/common/l1sap.c
176
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8 index 8bcd417..42c97c4 100644
172
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9 --- a/src/common/l1sap.c
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10 +++ b/src/common/l1sap.c
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11 @@ -1244,6 +1244,12 @@ static bool rtppayload_is_octet_aligned(const uint8_t *rtp_pl, uint8_t payload_l
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12
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13 static bool rtppayload_is_valid(struct gsm_lchan *lchan, struct msgb *resp_msg)
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14 {
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15 + /* Discard Themyscira BFI packets - because we have our own
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16 + * TDMA timing, there is no difference for us between receiving
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17 + * an explicit BFI packet vs receiving nothing at all. */
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18 + if (resp_msg->len == 2 && resp_msg->data[0] == 0xBF)
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19 + return false;
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20 +
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21 /* Avoid sending bw-efficient AMR to lower layers, most bts models
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22 * don't support it. */
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23 if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR &&
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24 @@ -1574,6 +1580,7 @@ static int l1sap_tch_ind(struct gsm_bts_trx *trx, struct osmo_phsap_prim *l1sap,
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25 struct gsm_lchan *lchan;
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26 uint8_t chan_nr;
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27 uint32_t fn;
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28 + uint8_t bfi[2];
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29
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30 chan_nr = tch_ind->chan_nr;
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31 fn = tch_ind->fn;
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32 @@ -1619,13 +1626,19 @@ static int l1sap_tch_ind(struct gsm_bts_trx *trx, struct osmo_phsap_prim *l1sap,
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33 /* Only clear the marker bit once we have sent a RTP packet with it */
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34 lchan->rtp_tx_marker = false;
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35 } else {
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36 - DEBUGPGT(DRTP, &g_time, "Skipping RTP frame with lost payload (chan_nr=0x%02x)\n",
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37 - chan_nr);
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38 - if (lchan->abis_ip.osmux.use)
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39 - lchan_osmux_skipped_frame(lchan, fn_ms_adj(fn, lchan));
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40 - else if (lchan->abis_ip.rtp_socket)
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41 - osmo_rtp_skipped_frame(lchan->abis_ip.rtp_socket, fn_ms_adj(fn, lchan));
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42 - lchan->rtp_tx_marker = true;
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43 + /* Themyscira change: send explicit BFI packets instead of
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44 + * gaps in the RTP stream. */
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45 + bfi[0] = 0xBF;
176
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46 + bfi[1] = (fn % 104 == 52); /* TAF */
172
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47 + if (lchan->abis_ip.osmux.use) {
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48 + lchan_osmux_send_frame(lchan, bfi, 2,
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49 + fn_ms_adj(fn, lchan), lchan->rtp_tx_marker);
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50 + } else if (lchan->abis_ip.rtp_socket) {
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51 + osmo_rtp_send_frame_ext(lchan->abis_ip.rtp_socket,
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52 + bfi, 2, fn_ms_adj(fn, lchan), lchan->rtp_tx_marker);
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53 + }
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54 + /* clear the marker like in the regular code path */
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55 + lchan->rtp_tx_marker = false;
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56 }
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57
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58 lchan->tch.last_fn = fn;
176
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59 diff --git a/src/osmo-bts-sysmo/l1_if.c b/src/osmo-bts-sysmo/l1_if.c
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60 index 5c99824..e35fc2e 100644
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61 --- a/src/osmo-bts-sysmo/l1_if.c
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62 +++ b/src/osmo-bts-sysmo/l1_if.c
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63 @@ -981,6 +981,10 @@ static int handle_ph_data_ind(struct femtol1_hdl *fl1, GsmL1_PhDataInd_t *data_i
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64 return rc;
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65 }
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66
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67 + /* Themyscira addition: empty RTP "ticks" on FACCH */
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68 + if (data_ind->sapi == GsmL1_Sapi_FacchF)
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69 + l1if_tch_rx_facch(trx, chan_nr, l1p_msg);
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70 +
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71 /* fill L1SAP header */
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72 sap_msg = l1sap_msgb_alloc(data_ind->msgUnitParam.u8Size);
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73 l1sap = msgb_l1sap_prim(sap_msg);
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74 diff --git a/src/osmo-bts-sysmo/l1_if.h b/src/osmo-bts-sysmo/l1_if.h
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75 index 8691eef..5b2da04 100644
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76 --- a/src/osmo-bts-sysmo/l1_if.h
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77 +++ b/src/osmo-bts-sysmo/l1_if.h
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78 @@ -129,6 +129,8 @@ int l1if_tch_encode(struct gsm_lchan *lchan, uint8_t *data, uint8_t *len,
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79 const uint8_t *rtp_pl, unsigned int rtp_pl_len, uint32_t fn,
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80 bool use_cache, bool marker);
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81 int l1if_tch_rx(struct gsm_bts_trx *trx, uint8_t chan_nr, struct msgb *l1p_msg);
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82 +int l1if_tch_rx_facch(struct gsm_bts_trx *trx, uint8_t chan_nr,
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83 + struct msgb *l1p_msg);
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84 int l1if_tch_fill(struct gsm_lchan *lchan, uint8_t *l1_buffer);
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85 struct msgb *gen_empty_tch_msg(struct gsm_lchan *lchan, uint32_t fn);
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86
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87 diff --git a/src/osmo-bts-sysmo/tch.c b/src/osmo-bts-sysmo/tch.c
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88 index a390c8c..f38d9fe 100644
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89 --- a/src/osmo-bts-sysmo/tch.c
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90 +++ b/src/osmo-bts-sysmo/tch.c
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91 @@ -131,12 +131,16 @@ static struct msgb *l1_to_rtppayload_efr(uint8_t *l1_payload,
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92
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93 cur[0] |= 0xC0;
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94 #endif /* USE_L1_RTP_MODE */
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95 +
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96 +/* this code is a bogon: osmo_amr_rtp_dec() won't grok EFR RTP format! */
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97 +#if 0
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98 enum osmo_amr_type ft;
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99 enum osmo_amr_quality bfi;
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100 uint8_t cmr;
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101 int8_t sti, cmi;
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102 osmo_amr_rtp_dec(l1_payload, payload_len, &cmr, &cmi, &ft, &bfi, &sti);
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103 lchan_set_marker(ft == AMR_GSM_EFR_SID, lchan);
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104 +#endif
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105
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106 return msg;
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107 }
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108 @@ -630,6 +634,38 @@ err_payload_match:
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109 return -EINVAL;
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110 }
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111
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112 +/*
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113 + * The following function is a Themyscira Wireless addition: we want to have
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114 + * an RTP packet sent out on *every* 20 ms "tick", even during times when
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115 + * TCH was stolen for FACCH. During FACCH stealing times, it appears that
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116 + * sysmoBTS PHY sends GsmL1_Sapi_FacchF and no GsmL1_Sapi_TchF, and with
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117 + * the original code l1if_tch_rx(), the function that feeds "ticks" to the
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118 + * RTP output mechanism, was never called. Our added l1if_tch_rx_facch()
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119 + * function sends an empty payload to the upper layers, and we call it
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120 + * from the GsmL1_Sapi_FacchF code path.
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121 + */
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122 +int l1if_tch_rx_facch(struct gsm_bts_trx *trx, uint8_t chan_nr,
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123 + struct msgb *l1p_msg)
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124 +{
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125 + GsmL1_Prim_t *l1p = msgb_l1prim(l1p_msg);
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126 + GsmL1_PhDataInd_t *data_ind = &l1p->u.phDataInd;
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127 + struct msgb *rmsg = NULL;
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128 + struct gsm_lchan *lchan = &trx->ts[L1SAP_CHAN2TS(chan_nr)].lchan[l1sap_chan2ss(chan_nr)];
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129 +
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130 + if (is_recv_only(lchan->abis_ip.speech_mode))
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131 + return -EAGAIN;
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132 +
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133 + LOGPFN(DL1P, LOGL_DEBUG, data_ind->u32Fn, "chan_nr %d Rx FACCH\n", chan_nr);
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134 + /* Push empty payload to upper layers */
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135 + rmsg = msgb_alloc_headroom(256, 128, "L1P-to-RTP");
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136 + return add_l1sap_header(trx, rmsg, lchan, chan_nr, data_ind->u32Fn,
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137 + data_ind->measParam.fBer * 10000,
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138 + data_ind->measParam.fLinkQuality * 10,
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139 + 0, /* suppress RSSI like in osmo-bts-trx */
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140 + data_ind->measParam.i16BurstTiming * 64,
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141 + 0);
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142 +}
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143 +
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144 struct msgb *gen_empty_tch_msg(struct gsm_lchan *lchan, uint32_t fn)
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145 {
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146 struct msgb *msg;