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reimplement chan_compat_with_mode() to take care of CSD

This commit is contained in:
Harald Welte 2012-08-24 15:21:35 +02:00
parent 9fc70f365a
commit bb53e3577a
1 changed files with 34 additions and 9 deletions
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43
openbsc/src/libbsc/bsc_api.c
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@ -313,19 +313,44 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
/*
* \brief Check if the given channel is compatible with the mode/fullrate
*
* NOTE: This code is only written with TCH/F and TCH/H in mind. This means
* that it will not work for CSD, handover, etc. This also assumes that the
* type of the lchan is either a TCH or a SDCCH.
*/
static int chan_compat_with_mode(struct gsm_lchan *lchan, int chan_mode, int full_rate)
{
if (lchan->type == GSM_LCHAN_SDCCH)
return 0;
if (full_rate && lchan->type != GSM_LCHAN_TCH_F)
return 0;
switch (chan_mode) {
case GSM48_CMODE_SIGN:
/* signalling is always possible */
return 1;
case GSM48_CMODE_SPEECH_V1:
case GSM48_CMODE_SPEECH_AMR:
case GSM48_CMODE_DATA_3k6:
case GSM48_CMODE_DATA_6k0:
/* these services can all run on TCH/H, but we may have
* an explicit override by the 'full_rate' argument */
switch (lchan->type) {
case GSM_LCHAN_TCH_F:
return 1;
case GSM_LCHAN_TCH_H:
if (full_rate)
return 0;
else
return 1;
break;
default:
return 0;
}
break;
case GSM48_CMODE_DATA_12k0:
case GSM48_CMODE_DATA_14k5:
case GSM48_CMODE_SPEECH_EFR:
/* these services all explicitly require a TCH/F */
if (lchan->type == GSM_LCHAN_TCH_F)
return 1;
else
return 0;
break;
}
return 1;
return 0;
}
/**