[PATCH] libosmocore[master]: AMR: add function to check speech frames

[Max]

Review at  https://gerrit.osmocom.org/959

AMR: add function to check speech frames

Add convenience function osmo_amr_is_speech() to check if given AMR
frame is speech frame: non-speech frames often require special
processing.

Change-Id: Ifaab02a2f581acc302b367d34fd2fc28a4d1e2e3
---
M include/osmocom/codec/codec.h
M src/codec/gsm690.c
2 files changed, 22 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/59/959/1

diff --git a/include/osmocom/codec/codec.h b/include/osmocom/codec/codec.h
index f7a8ad9..305fad9 100644
--- a/include/osmocom/codec/codec.h
+++ b/include/osmocom/codec/codec.h
@@ -44,6 +44,7 @@
 
 bool osmo_fr_check_sid(uint8_t *rtp_payload, size_t payload_len);
 bool osmo_hr_check_sid(uint8_t *rtp_payload, size_t payload_len);
+bool osmo_amr_is_speech(enum osmo_amr_type ft);
 int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
 		     enum osmo_amr_quality bfi);
 int osmo_amr_rtp_dec(const uint8_t *payload, int payload_len, uint8_t *cmr,
diff --git a/src/codec/gsm690.c b/src/codec/gsm690.c
index 0f4bf8f..fc1ca3d 100644
--- a/src/codec/gsm690.c
+++ b/src/codec/gsm690.c
@@ -235,6 +235,27 @@
 	{ 0,			NULL },
 };
 
+/*! \brief Check if given AMR Frame Type is a speech frame
+ *  \param[in] ft AMR Frame Type
+ *  \returns true if AMR with given Frame Type contains voice, false otherwise
+ */
+bool osmo_amr_is_speech(enum osmo_amr_type ft)
+{
+	switch (ft) {
+	case AMR_4_75:
+	case AMR_5_15:
+	case AMR_5_90:
+	case AMR_6_70:
+	case AMR_7_40:
+	case AMR_7_95:
+	case AMR_10_2:
+	case AMR_12_2:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /*! \brief Decode various AMR parameters from RTP payload (RFC 4867) acording to
  *         3GPP TS 26.101
  *  \param[in] rtppayload Payload from RTP packet

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ifaab02a2f581acc302b367d34fd2fc28a4d1e2e3
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Max <msuraev at sysmocom.de>