lib_com/ivas_rom_com.c

@@ -889,13 +889,20 @@ const ivas_spar_br_table_t ivas_spar_br_table_consts[IVAS_SPAR_BR_TABLE_LEN] =
 {
 /* When AGC is ON additional (AGC_BITS_PER_CH+1) bits may be taken from each core-coder channel
    so minimum core-coder bitrate per channel can be min core-coder bitrates as per the table - AGC_BITS_PER_CH */
- /* preferred tuning (3.2/4.9kbps) with/out TDD */
 	{ 13200, 0, SBA_FOA_ORDER, FB, 24000, 1, WYXZ, 1, 0,
+#ifdef FIX_487_LOWRATE_SBA_TUNING_FIX
+	{ { 10000, 8150, 13150 } },
+#else
 	{ { 10000, 8300, 13150 } },
+#endif
     { { 15, 1, 5, 1 },{ 15, 1, 3, 1 },{ 7, 1, 3, 1 } }, 0, 0, 0 },
 	{ 16400, 0, SBA_FOA_ORDER, FB, 24000, 1, WYXZ, 1, 0,
+#ifdef FIX_487_LOWRATE_SBA_TUNING_FIX
+	{ { 13200, 11350, 16350 } },
+#else
 	{ { 13200, 11500, 16350 } },
+#endif
     { { 15, 1, 5, 1 },{ 15, 1, 3, 1 },{ 7, 1, 3, 1 } },	0, 0, 0 },
     { 24400, 0, SBA_FOA_ORDER, FB, 24000, 1, WYXZ, 1, 0,{ { 16400, 14850, 24350 } },
     { { 15, 1, 5, 1 },{ 15, 1, 3, 1 },{ 7, 1, 3, 1 } }, 0, 0, 0 },

lib_com/options.h

@@ -221,6 +221,8 @@
 
 #define HYBRID_ITD_MAX                                 /* FhG: Improvement for DFT-stereo for cases with large ITDs */
 
+#define FIX_487_LOWRATE_SBA_TUNING_FIX                  /* Dlb: TUning fix for low bitrate cases to match theoretical longest SPAR MD bitstream */
+
 
 /* ################## End DEVELOPMENT switches ######################### */
 /* clang-format on */