[PATCH] libosmocore[master]: gsm0808: add default speech codec configuration

[dexter]

Review at  https://gerrit.osmocom.org/2829

gsm0808: add default speech codec configuration

In an AoIP scenario, the speech codec list field specifies the
codecs used in the RTP interface. This patch adds a table
with default codec configurations that match the codec
configurations that are also used on the air interface.

Change-Id: I9dc0165d76a022b2c1b7418bc3133407e61b7261
---
M include/osmocom/gsm/protocol/gsm_08_08.h
1 file changed, 20 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/29/2829/1

diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index e93b8bc..f7cd1cb 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -449,6 +449,26 @@
 	uint16_t cfg;
 };
 
+/* Default speech codec configurations: Some codecs specified with
+ * struct gsm0808_speech_codec, require a configuration (cfg). The following
+ * default configuration will configure the codec (RTP) to match the
+ * configuration that is used on the air interface (Um). */
+enum gsm0808_speech_codec_defaults {
+	/* Default values for FR_AMR, HR_AMR and OHR_AMR:
+	 * See also: 3GPP TS 28.062, Table 7.11.3.1.3-2: Preferred Configurations
+	 * for the Adaptive Multi-Rate Codec Types */
+	GSM0808_SC_CFG_DEFAULT_FR_AMR		= 0xffff,
+	GSM0808_SC_CFG_DEFAULT_HR_AMR		= 0x073f,
+	GSM0808_SC_CFG_DEFAULT_OHR_AMR		= 0xffff,
+
+	/* Default values for FR_AMR_WB, OFR_AMR_WB and OHR_AMR_WB:
+	 * See also: 3GPP TS 26.103, Table 5.7-1: Allowed Configurations for the
+	 * Adaptive Multi-Rate – Wideband Codec Types */
+	GSM0808_SC_CFG_DEFAULT_FR_AMR_WB	= 0x01,
+	GSM0808_SC_CFG_DEFAULT_OFR_AMR_WB	= 0x3f,
+	GSM0808_SC_CFG_DEFAULT_OHR_AMR_WB	= 0x01,
+};
+
 /* 3GPP TS 48.008 3.2.2.103 Speech Codec List */
 #define SPEECH_CODEC_MAXLEN 255
 struct gsm0808_speech_codec_list {

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I9dc0165d76a022b2c1b7418bc3133407e61b7261
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: dexter <pmaier at sysmocom.de>