Add SBC helper includes

1 files changed, 65 insertions, 0 deletions

diff --git a/sbc/sbc_math.h b/sbc/sbc_math.h
new file mode 100644
index 00000000..c427bee3
--- /dev/null
+++ b/sbc/sbc_math.h
@@ -0,0 +1,65 @@
+/*
+ *
+ *  Bluetooth low-complexity, subband codec (SBC) library
+ *
+ *  Copyright (C) 2004-2007  Marcel Holtmann <marcel@holtmann.org>
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#define fabs(x) ((x) < 0 ? -(x) : (x))
+
+/* C does not provide an explicit arithmetic shift right but this will
+   always be correct and every compiler *should* generate optimal code */
+#define ASR(val, bits) ((-2 >> 1 == -1) ? \
+		((int32_t) (val)) >> (bits) : ((int32_t) (val)) / (1 << (bits)))
+
+#define SCALE_PROTO4_TBL	15
+#define SCALE_ANA4_TBL		16
+#define SCALE_PROTO8_TBL	15
+#define SCALE_ANA8_TBL		16
+#define SCALE_SPROTO4_TBL	16
+#define SCALE_SPROTO8_TBL	16
+#define SCALE_NPROTO4_TBL	10
+#define SCALE_NPROTO8_TBL	12
+#define SCALE_SAMPLES		14
+#define SCALE4_STAGE1_BITS	16
+#define SCALE4_STAGE2_BITS	18
+#define SCALE4_STAGED1_BITS	15
+#define SCALE4_STAGED2_BITS	15
+#define SCALE8_STAGE1_BITS	16
+#define SCALE8_STAGE2_BITS	18
+#define SCALE8_STAGED1_BITS	15
+#define SCALE8_STAGED2_BITS	15
+
+typedef int32_t sbc_fixed_t;
+
+#define SCALE4_STAGE1(src)  ASR(src, SCALE4_STAGE1_BITS)
+#define SCALE4_STAGE2(src)  ASR(src, SCALE4_STAGE2_BITS)
+#define SCALE4_STAGED1(src) ASR(src, SCALE4_STAGED1_BITS)
+#define SCALE4_STAGED2(src) ASR(src, SCALE4_STAGED2_BITS)
+#define SCALE8_STAGE1(src)  ASR(src, SCALE8_STAGE1_BITS)
+#define SCALE8_STAGE2(src)  ASR(src, SCALE8_STAGE2_BITS)
+#define SCALE8_STAGED1(src) ASR(src, SCALE8_STAGED1_BITS)
+#define SCALE8_STAGED2(src) ASR(src, SCALE8_STAGED2_BITS)
+
+#define SBC_FIXED_0(val) { val = 0; }
+#define ADD(dst, src)    { dst += src; }
+#define SUB(dst, src)    { dst -= src; }
+#define MUL(dst, a, b)   { dst = (sbc_fixed_t) a * b; }
+#define MULA(dst, a, b)  { dst += (sbc_fixed_t) a * b; }
+#define DIV2(dst, src)   { dst = ASR(src, 1); }