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media/libopus/silk/float/SigProc_FLP.h@b8a032363ba2 (annotated)

media/libopus/silk/float/SigProc_FLP.h

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/***********************************************************************
michael@0	2	Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0	3	Redistribution and use in source and binary forms, with or without
michael@0	4	modification, are permitted provided that the following conditions
michael@0	5	are met:
michael@0	6	- Redistributions of source code must retain the above copyright notice,
michael@0	7	this list of conditions and the following disclaimer.
michael@0	8	- Redistributions in binary form must reproduce the above copyright
michael@0	9	notice, this list of conditions and the following disclaimer in the
michael@0	10	documentation and/or other materials provided with the distribution.
michael@0	11	- Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0	12	names of specific contributors, may be used to endorse or promote
michael@0	13	products derived from this software without specific prior written
michael@0	14	permission.
michael@0	15	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0	16	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0	17	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0	18	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0	19	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0	20	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0	21	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0	22	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0	23	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0	24	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0	25	POSSIBILITY OF SUCH DAMAGE.
michael@0	26	***********************************************************************/
michael@0	27
michael@0	28	#ifndef SILK_SIGPROC_FLP_H
michael@0	29	#define SILK_SIGPROC_FLP_H
michael@0	30
michael@0	31	#include "SigProc_FIX.h"
michael@0	32	#include "float_cast.h"
michael@0	33	#include <math.h>
michael@0	34
michael@0	35	#ifdef __cplusplus
michael@0	36	extern "C"
michael@0	37	{
michael@0	38	#endif
michael@0	39
michael@0	40	/********************************************************************/
michael@0	41	/* SIGNAL PROCESSING FUNCTIONS */
michael@0	42	/********************************************************************/
michael@0	43
michael@0	44	/* Chirp (bw expand) LP AR filter */
michael@0	45	void silk_bwexpander_FLP(
michael@0	46	silk_float *ar, /* I/O AR filter to be expanded (without leading 1) */
michael@0	47	const opus_int d, /* I length of ar */
michael@0	48	const silk_float chirp /* I chirp factor (typically in range (0..1) ) */
michael@0	49	);
michael@0	50
michael@0	51	/* compute inverse of LPC prediction gain, and */
michael@0	52	/* test if LPC coefficients are stable (all poles within unit circle) */
michael@0	53	/* this code is based on silk_FLP_a2k() */
michael@0	54	silk_float silk_LPC_inverse_pred_gain_FLP( /* O return inverse prediction gain, energy domain */
michael@0	55	const silk_float *A, /* I prediction coefficients [order] */
michael@0	56	opus_int32 order /* I prediction order */
michael@0	57	);
michael@0	58
michael@0	59	silk_float silk_schur_FLP( /* O returns residual energy */
michael@0	60	silk_float refl_coef[], /* O reflection coefficients (length order) */
michael@0	61	const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */
michael@0	62	opus_int order /* I order */
michael@0	63	);
michael@0	64
michael@0	65	void silk_k2a_FLP(
michael@0	66	silk_float *A, /* O prediction coefficients [order] */
michael@0	67	const silk_float *rc, /* I reflection coefficients [order] */
michael@0	68	opus_int32 order /* I prediction order */
michael@0	69	);
michael@0	70
michael@0	71	/* Solve the normal equations using the Levinson-Durbin recursion */
michael@0	72	silk_float silk_levinsondurbin_FLP( /* O prediction error energy */
michael@0	73	silk_float A[], /* O prediction coefficients [order] */
michael@0	74	const silk_float corr[], /* I input auto-correlations [order + 1] */
michael@0	75	const opus_int order /* I prediction order */
michael@0	76	);
michael@0	77
michael@0	78	/* compute autocorrelation */
michael@0	79	void silk_autocorrelation_FLP(
michael@0	80	silk_float *results, /* O result (length correlationCount) */
michael@0	81	const silk_float *inputData, /* I input data to correlate */
michael@0	82	opus_int inputDataSize, /* I length of input */
michael@0	83	opus_int correlationCount /* I number of correlation taps to compute */
michael@0	84	);
michael@0	85
michael@0	86	opus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */
michael@0	87	const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */
michael@0	88	opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */
michael@0	89	opus_int16 *lagIndex, /* O Lag Index */
michael@0	90	opus_int8 *contourIndex, /* O Pitch contour Index */
michael@0	91	silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */
michael@0	92	opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */
michael@0	93	const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */
michael@0	94	const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */
michael@0	95	const opus_int Fs_kHz, /* I sample frequency (kHz) */
michael@0	96	const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */
michael@0	97	const opus_int nb_subfr, /* I Number of 5 ms subframes */
michael@0	98	int arch /* I Run-time architecture */
michael@0	99	);
michael@0	100
michael@0	101	void silk_insertion_sort_decreasing_FLP(
michael@0	102	silk_float *a, /* I/O Unsorted / Sorted vector */
michael@0	103	opus_int *idx, /* O Index vector for the sorted elements */
michael@0	104	const opus_int L, /* I Vector length */
michael@0	105	const opus_int K /* I Number of correctly sorted positions */
michael@0	106	);
michael@0	107
michael@0	108	/* Compute reflection coefficients from input signal */
michael@0	109	silk_float silk_burg_modified_FLP( /* O returns residual energy */
michael@0	110	silk_float A[], /* O prediction coefficients (length order) */
michael@0	111	const silk_float x[], /* I input signal, length: nb_subfr*(D+L_sub) */
michael@0	112	const silk_float minInvGain, /* I minimum inverse prediction gain */
michael@0	113	const opus_int subfr_length, /* I input signal subframe length (incl. D preceding samples) */
michael@0	114	const opus_int nb_subfr, /* I number of subframes stacked in x */
michael@0	115	const opus_int D /* I order */
michael@0	116	);
michael@0	117
michael@0	118	/* multiply a vector by a constant */
michael@0	119	void silk_scale_vector_FLP(
michael@0	120	silk_float *data1,
michael@0	121	silk_float gain,
michael@0	122	opus_int dataSize
michael@0	123	);
michael@0	124
michael@0	125	/* copy and multiply a vector by a constant */
michael@0	126	void silk_scale_copy_vector_FLP(
michael@0	127	silk_float *data_out,
michael@0	128	const silk_float *data_in,
michael@0	129	silk_float gain,
michael@0	130	opus_int dataSize
michael@0	131	);
michael@0	132
michael@0	133	/* inner product of two silk_float arrays, with result as double */
michael@0	134	double silk_inner_product_FLP(
michael@0	135	const silk_float *data1,
michael@0	136	const silk_float *data2,
michael@0	137	opus_int dataSize
michael@0	138	);
michael@0	139
michael@0	140	/* sum of squares of a silk_float array, with result as double */
michael@0	141	double silk_energy_FLP(
michael@0	142	const silk_float *data,
michael@0	143	opus_int dataSize
michael@0	144	);
michael@0	145
michael@0	146	/********************************************************************/
michael@0	147	/* MACROS */
michael@0	148	/********************************************************************/
michael@0	149
michael@0	150	#define PI (3.1415926536f)
michael@0	151
michael@0	152	#define silk_min_float( a, b ) (((a) < (b)) ? (a) : (b))
michael@0	153	#define silk_max_float( a, b ) (((a) > (b)) ? (a) : (b))
michael@0	154	#define silk_abs_float( a ) ((silk_float)fabs(a))
michael@0	155
michael@0	156	/* sigmoid function */
michael@0	157	static OPUS_INLINE silk_float silk_sigmoid( silk_float x )
michael@0	158	{
michael@0	159	return (silk_float)(1.0 / (1.0 + exp(-x)));
michael@0	160	}
michael@0	161
michael@0	162	/* floating-point to integer conversion (rounding) */
michael@0	163	static OPUS_INLINE opus_int32 silk_float2int( silk_float x )
michael@0	164	{
michael@0	165	return (opus_int32)float2int( x );
michael@0	166	}
michael@0	167
michael@0	168	/* floating-point to integer conversion (rounding) */
michael@0	169	static OPUS_INLINE void silk_float2short_array(
michael@0	170	opus_int16 *out,
michael@0	171	const silk_float *in,
michael@0	172	opus_int32 length
michael@0	173	)
michael@0	174	{
michael@0	175	opus_int32 k;
michael@0	176	for( k = length - 1; k >= 0; k-- ) {
michael@0	177	out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) );
michael@0	178	}
michael@0	179	}
michael@0	180
michael@0	181	/* integer to floating-point conversion */
michael@0	182	static OPUS_INLINE void silk_short2float_array(
michael@0	183	silk_float *out,
michael@0	184	const opus_int16 *in,
michael@0	185	opus_int32 length
michael@0	186	)
michael@0	187	{
michael@0	188	opus_int32 k;
michael@0	189	for( k = length - 1; k >= 0; k-- ) {
michael@0	190	out[k] = (silk_float)in[k];
michael@0	191	}
michael@0	192	}
michael@0	193
michael@0	194	/* using log2() helps the fixed-point conversion */
michael@0	195	static OPUS_INLINE silk_float silk_log2( double x )
michael@0	196	{
michael@0	197	return ( silk_float )( 3.32192809488736 * log10( x ) );
michael@0	198	}
michael@0	199
michael@0	200	#ifdef __cplusplus
michael@0	201	}
michael@0	202	#endif
michael@0	203
michael@0	204	#endif /* SILK_SIGPROC_FLP_H */