auto import from //branches/cupcake_rel/...@138607
diff --git a/libspeex/filters.h b/libspeex/filters.h
new file mode 100644
index 0000000..e3a5980
--- /dev/null
+++ b/libspeex/filters.h
@@ -0,0 +1,90 @@
+/* Copyright (C) 2002 Jean-Marc Valin */
+/**
+ @file filters.h
+ @brief Various analysis/synthesis filters
+*/
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ - Neither the name of the Xiph.org Foundation nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef FILTERS_H
+#define FILTERS_H
+
+#include "arch.h"
+
+spx_word16_t compute_rms(const spx_sig_t *x, int len);
+spx_word16_t compute_rms16(const spx_word16_t *x, int len);
+void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len);
+void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len);
+
+#ifdef FIXED_POINT
+
+int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len);
+
+#endif
+
+
+#define HIGHPASS_NARROWBAND 0
+#define HIGHPASS_WIDEBAND 2
+#define HIGHPASS_INPUT 0
+#define HIGHPASS_OUTPUT 1
+#define HIGHPASS_IRS 4
+
+void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem);
+
+
+void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_word16_t *, spx_word16_t *y2, int N, int M, spx_word16_t *mem, char *stack);
+void qmf_synth(const spx_word16_t *x1, const spx_word16_t *x2, const spx_word16_t *a, spx_word16_t *y, int N, int M, spx_word16_t *mem1, spx_word16_t *mem2, char *stack);
+
+void filter_mem16(const spx_word16_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
+void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
+void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
+
+/* Apply bandwidth expansion on LPC coef */
+void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order);
+void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len);
+
+
+void syn_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
+void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
+
+void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
+
+void multicomb(
+spx_word16_t *exc, /*decoded excitation*/
+spx_word16_t *new_exc, /*enhanced excitation*/
+spx_coef_t *ak, /*LPC filter coefs*/
+int p, /*LPC order*/
+int nsf, /*sub-frame size*/
+int pitch, /*pitch period*/
+int max_pitch, /*pitch gain (3-tap)*/
+spx_word16_t comb_gain, /*gain of comb filter*/
+char *stack
+);
+
+#endif