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[WIP] csd_v110: align TCH/F4.8 NT with DL radio blocks

Change-Id: Iea4a21ab9d333bbf416a0997971b1ba25784f238
Related: OS#1572
---
M src/common/csd_v110.c
1 file changed, 10 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/03/38303/1

diff --git a/src/common/csd_v110.c b/src/common/csd_v110.c
index 5fb86b7..aed1715 100644
--- a/src/common/csd_v110.c
+++ b/src/common/csd_v110.c
@@ -199,6 +199,16 @@
 			osmo_csd_12k_6k_encode_frame(&data[i * 60], 60, &df);
 		else /* desc->num_bits == 36 */
 			osmo_csd_3k6_encode_frame(&data[i * 36], 36, &df);
+
+		if (lchan->csd_mode == LCHAN_CSD_M_NT) {
+			if ((i & 1) == 0) { /* executed for Q1/Q3 */
+				/* E7: 0 for Q1, 1 for Q2/Q3/Q4 (3GPP TS 44.021, Figure 1)
+				 * E2: 0 for Q1/Q2, 1 for Q3/Q4 (3GPP TS 48.020, Table 7) */
+				if (OSMO_UNLIKELY(df.e_bits[1] != df.e_bits[6]))
+					return -EINVAL; /* drop unaligned blocks */
+				/* TODO: (for TCH/F4.8) store and send this block later? */
+			}
+		}
 	}
 
 	return desc->num_blocks * desc->num_bits;

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