diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/voicefac.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/voicefac.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/voicefac.c b/media/libstagefright/codecs/amrwbenc/src/voicefac.c new file mode 100644 index 0000000..187d774 --- /dev/null +++ b/media/libstagefright/codecs/amrwbenc/src/voicefac.c @@ -0,0 +1,92 @@ +/*
+ ** Copyright 2003-2010, VisualOn, Inc.
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+
+/***********************************************************************
+* File: voicefac.c *
+* *
+* Description: Find the voicing factors (1 = voice to -1 = unvoiced) *
+* *
+************************************************************************/
+
+#include "typedef.h"
+#include "basic_op.h"
+#include "math_op.h"
+
+Word16 voice_factor( /* (o) Q15 : factor (-1=unvoiced to 1=voiced) */
+ Word16 exc[], /* (i) Q_exc : pitch excitation */
+ Word16 Q_exc, /* (i) : exc format */
+ Word16 gain_pit, /* (i) Q14 : gain of pitch */
+ Word16 code[], /* (i) Q9 : Fixed codebook excitation */
+ Word16 gain_code, /* (i) Q0 : gain of code */
+ Word16 L_subfr /* (i) : subframe length */
+ )
+{
+ Word16 tmp, exp, ener1, exp1, ener2, exp2;
+ Word32 i, L_tmp;
+
+#ifdef ASM_OPT /* asm optimization branch */
+ ener1 = extract_h(Dot_product12_asm(exc, exc, L_subfr, &exp1));
+#else
+ ener1 = extract_h(Dot_product12(exc, exc, L_subfr, &exp1));
+#endif
+ exp1 = exp1 - (Q_exc + Q_exc);
+ L_tmp = vo_L_mult(gain_pit, gain_pit);
+ exp = norm_l(L_tmp);
+ tmp = extract_h(L_tmp << exp);
+ ener1 = vo_mult(ener1, tmp);
+ exp1 = exp1 - exp - 10; /* 10 -> gain_pit Q14 to Q9 */
+
+#ifdef ASM_OPT /* asm optimization branch */
+ ener2 = extract_h(Dot_product12_asm(code, code, L_subfr, &exp2));
+#else
+ ener2 = extract_h(Dot_product12(code, code, L_subfr, &exp2));
+#endif
+
+ exp = norm_s(gain_code);
+ tmp = gain_code << exp;
+ tmp = vo_mult(tmp, tmp);
+ ener2 = vo_mult(ener2, tmp);
+ exp2 = exp2 - (exp + exp);
+
+ i = exp1 - exp2;
+
+ if (i >= 0)
+ {
+ ener1 = ener1 >> 1;
+ ener2 = ener2 >> (i + 1);
+ } else
+ {
+ ener1 = ener1 >> (1 - i);
+ ener2 = ener2 >> 1;
+ }
+
+ tmp = vo_sub(ener1, ener2);
+ ener1 = add1(add1(ener1, ener2), 1);
+
+ if (tmp >= 0)
+ {
+ tmp = div_s(tmp, ener1);
+ } else
+ {
+ tmp = vo_negate(div_s(vo_negate(tmp), ener1));
+ }
+
+ return (tmp);
+}
+
+
+
+
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