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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/calc_en.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/calc_en.h | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/calc_en.h b/media/libstagefright/codecs/amrnb/enc/src/calc_en.h new file mode 100644 index 0000000..052f5b4 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/calc_en.h @@ -0,0 +1,192 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * 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. + * ------------------------------------------------------------------- + */ +/**************************************************************************************** +Portions of this file are derived from the following 3GPP standard: + + 3GPP TS 26.073 + ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec + Available from http://www.3gpp.org + +(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) +Permission to distribute, modify and use this file under the standard license +terms listed above has been obtained from the copyright holder. +****************************************************************************************/ +/* +------------------------------------------------------------------------------ + + + + Filename: /audio/gsm_amr/c/src/include/c_g_aver.h + + Date: 12/29/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Moved _cplusplus #ifdef after Include section. + + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + File : calc_en.h + Purpose : calculation of energy coefficients for quantizers + +------------------------------------------------------------------------------ +*/ + +#ifndef _CALC_EN_H_ +#define _CALC_EN_H_ +#define calc_en_h "$Id $" + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" +#include "mode.h" + +/*--------------------------------------------------------------------------*/ +#ifdef __cplusplus +extern "C" +{ +#endif + + /*---------------------------------------------------------------------------- + ; MACROS + ; [Define module specific macros here] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; DEFINES + ; [Include all pre-processor statements here.] + ----------------------------------------------------------------------------*/ + + + /*---------------------------------------------------------------------------- + ; EXTERNAL VARIABLES REFERENCES + ; [Declare variables used in this module but defined elsewhere] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; SIMPLE TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; ENUMERATED TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; STRUCTURES TYPEDEF'S + ----------------------------------------------------------------------------*/ + + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; [List function prototypes here] + ----------------------------------------------------------------------------*/ + /* + * FUNCTION: calc_unfilt_energies + * + * PURPOSE: calculation of several energy coefficients for unfiltered + * excitation signals and the LTP coding gain + * + * frac_en[0]*2^exp_en[0] = <res res> // LP residual energy + * frac_en[1]*2^exp_en[1] = <exc exc> // LTP residual energy + * frac_en[2]*2^exp_en[2] = <exc code> // LTP/CB innovation dot product + * frac_en[3]*2^exp_en[3] = <lres lres> // LTP residual energy + * // (lres = res - gain_pit*exc) + * ltpg = log2(LP_res_en / LTP_res_en) + */ + void + calc_unfilt_energies( + Word16 res[], /* i : LP residual, Q0 */ + Word16 exc[], /* i : LTP excitation (unfiltered), Q0 */ + Word16 code[], /* i : CB innovation (unfiltered), Q13 */ + Word16 gain_pit, /* i : pitch gain, Q14 */ + Word16 L_subfr, /* i : Subframe length */ + + Word16 frac_en[], /* o : energy coefficients (3), fraction part, Q15 */ + Word16 exp_en[], /* o : energy coefficients (3), exponent part, Q0 */ + Word16 *ltpg, /* o : LTP coding gain (log2()), Q13 */ + Flag *pOverflow + ); + + /* + * FUNCTION: calc_filt_energies + * + * PURPOSE: calculation of several energy coefficients for filtered + * excitation signals + * + * Compute coefficients need for the quantization and the optimum + * codebook gain gcu (for MR475 only). + * + * coeff[0] = y1 y1 + * coeff[1] = -2 xn y1 + * coeff[2] = y2 y2 + * coeff[3] = -2 xn y2 + * coeff[4] = 2 y1 y2 + * + * + * gcu = <xn2, y2> / <y2, y2> (0 if <xn2, y2> <= 0) + * + * Product <y1 y1> and <xn y1> have been computed in G_pitch() and + * are in vector g_coeff[]. + */ + void + calc_filt_energies( + enum Mode mode, /* i : coder mode */ + Word16 xn[], /* i : LTP target vector, Q0 */ + Word16 xn2[], /* i : CB target vector, Q0 */ + Word16 y1[], /* i : Adaptive codebook, Q0 */ + Word16 Y2[], /* i : Filtered innovative vector, Q12 */ + Word16 g_coeff[], /* i : Correlations <xn y1> <y1 y1> */ + /* computed in G_pitch() */ + + Word16 frac_coeff[],/* o : energy coefficients (5), fraction part, Q15 */ + Word16 exp_coeff[], /* o : energy coefficients (5), exponent part, Q0 */ + Word16 *cod_gain_frac,/* o: optimum codebook gain (fraction part), Q15 */ + Word16 *cod_gain_exp, /* o: optimum codebook gain (exponent part), Q0 */ + Flag *pOverflow + ); + + /* + * FUNCTION: calc_target_energy + * + * PURPOSE: calculation of target energy + * + * en = <xn, xn> + */ + void + calc_target_energy( + Word16 xn[], /* i: LTP target vector, Q0 */ + Word16 *en_exp, /* o: optimum codebook gain (exponent part), Q0 */ + Word16 *en_frac, /* o: optimum codebook gain (fraction part), Q15 */ + Flag *pOverflow + ); + +#ifdef __cplusplus +} +#endif + +#endif /* _CALC_EN_H_ */ + + + + + |