# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1763677725 0
# Node ID 699afc9ef063771aaa7ec173d52c2d2dc59b27b5
# Parent  9cc76853d291fbf85be8ba9d04fbf97c2cb57801
TRAU-AMR-8k: implement MR74 speech decoding

diff -r 9cc76853d291 -r 699afc9ef063 trau-decode/amr8-common.c
--- a/trau-decode/amr8-common.c	Thu Nov 20 22:09:43 2025 +0000
+++ b/trau-decode/amr8-common.c	Thu Nov 20 22:28:45 2025 +0000
@@ -456,6 +456,7 @@
 	print_speech_params(d_bits + 58, params_67_sf24);
 	print_speech_params(d_bits + 83, params_67_sf13);
 	print_speech_params(d_bits + 112, params_67_sf24);
+
 	saved_mode_valid = 0;
 }
 
@@ -463,7 +464,31 @@
 handle_amr8_7k4(frame_bits)
 	ubit_t *frame_bits;
 {
-	puts("  TRAU-AMR-8k MR74 format, decoding to be implemented");
+	ubit_t *c_bits = frame_bits + 17;
+	ubit_t d_bits[151], crc_collect[37];
+	int crc_stat;
+
+	bcopy(frame_bits + 3, d_bits, 5);
+	bcopy(frame_bits + 9, d_bits + 5, 7);
+	bcopy(frame_bits + 20, d_bits + 12, 4);
+	bcopy(frame_bits + 25, d_bits + 16, 135);
+
+	decode_6k7_7k4_common(c_bits, d_bits, "MR74", 5);
+	bcopy(c_bits, crc_collect, 3);
+	bcopy(d_bits, crc_collect + 3, 20);
+	bcopy(d_bits + 21, crc_collect + 23, 3);
+	bcopy(d_bits + 26, crc_collect + 26, 6);
+	bcopy(d_bits + 51, crc_collect + 32, 2);
+	bcopy(d_bits + 54, crc_collect + 34, 3);
+	crc_stat = osmo_crc8gen_check_bits(&gsm0860_amr_crc3, crc_collect, 37,
+					   d_bits + 58);
+	printf("  CRC %s\n", crc_stat ? "bad" : "good");
+	print_speech_params(d_bits, params_lsf_59_67_74);
+	print_speech_params(d_bits + 26, params_74_sf13);
+	print_speech_params(d_bits + 61, params_74_sf24);
+	print_speech_params(d_bits + 90, params_74_sf13);
+	print_speech_params(d_bits + 122, params_74_sf24);
+
 	saved_mode_valid = 0;
 }