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gsm_08_08: add missing GSM0808_SCT_EXT

As per 3GPP TS 48.008, section 3.2.2.103, the "Codec Type" field may
contain either a certain 3GPP Speech Codec Type directly (4 bit value),
or the so called "Codec Extension" = 0xFh, in which case the real Codec
Type follows in the next octet as "Extended Codec Type".

CSD is such an example, the encoding is defined as follows:

     8    7    6    5    4    3    2    1
  +----+----+----+----+-------------------+
  | -- | PI | PT | -- |        0xFh       |
  +----+----+----+----+-------------------+
  |      Extended Codec Type (CSData)     |
  +----+----+-----------------------------+
  | R2 | R3 |                             |
  +----+----+-----------------------------+

  CSData is coded with 0xFDh or '1111 1101' (0xfd).

We already have GSM0808_SCT_CSD, add the missing GSM0808_SCT_EXT.

Change-Id: Iafaa25070684d2ba400c75fa33e803651a5ce857
Related: OS#6110, OS#4393, OS#4394
---
M include/osmocom/gsm/protocol/gsm_08_08.h
1 file changed, 32 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/11/33911/1

diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index 967e4fe..05cfa26 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -554,6 +554,8 @@
 	GSM0808_SCT_HR3	= 0x4, /*!< HR_AMR */
 	GSM0808_SCT_HR4	= 0xd, /*!< OHR AMR-WB */
 	GSM0808_SCT_HR6	= 0xb, /*!< OHR AMR */
+	GSM0808_SCT_HR6	= 0xb, /*!< OHR AMR */
+	GSM0808_SCT_EXT	= 0xf, /*!< Codec Extension (the real Codec Type follows) */
 	GSM0808_SCT_CSD	= 0xfd, /*!< CSData (see also TS 26.103) */
 };
 

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