codec: add osmo_gsm611_silence_frame[] datum
Table 1 in section 6 of 3GPP TS 46.011 (FR codec, substitution and
muting of lost frames) specifies a silence frame in the form of
GSM 06.10 parameters - add a const datum to libosmocodec embodying
this GSM 06.11 silence frame in GSM-FR RTP encoding.
Related: OS#6027
Change-Id: Idf31051ea783435268944286a71d2b0ac342a4b5
diff --git a/include/osmocom/codec/codec.h b/include/osmocom/codec/codec.h
index 7f82432..731f169 100644
--- a/include/osmocom/codec/codec.h
+++ b/include/osmocom/codec/codec.h
@@ -33,6 +33,8 @@
extern const uint16_t gsm690_5_15_bitorder[]; /* AMR 5.15 kbits */
extern const uint16_t gsm690_4_75_bitorder[]; /* AMR 4.75 kbits */
+extern const uint8_t osmo_gsm611_silence_frame[GSM_FR_BYTES];
+
extern const struct value_string osmo_amr_type_names[];
enum osmo_amr_type {
diff --git a/src/codec/gsm610.c b/src/codec/gsm610.c
index 4731e9e..19c7aa4 100644
--- a/src/codec/gsm610.c
+++ b/src/codec/gsm610.c
@@ -296,6 +296,20 @@
29, /* LARc5:0 */
};
+/*
+ * Table 1 in section 6 of 3GPP TS 46.011 (substitution and muting of lost
+ * frames) specifies a silence frame in the form of GSM 06.10 parameters;
+ * the following const datum is this GSM 06.11 silence frame in GSM-FR
+ * RTP encoding.
+ */
+const uint8_t osmo_gsm611_silence_frame[GSM_FR_BYTES] = {
+ 0xDA, 0xA7, 0xAA, 0xA5, 0x1A,
+ 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
+ 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
+ 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
+ 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
+};
+
static const uint16_t sid_code_word_bits[95] = {
/* bit numbers are relative to the RTP frame beginning,
* with signature bits included in the count. */