Low bitrate SBA tuning fix to ensure worst case SPAR MD bitstream and... (8d0cf2c5) · Commits · IVAS Codec Public Collaboration / IVAS Codec

lib_com/ivas_rom_com.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -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 },

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 */