FreeCalypso > hg > gsm-codec-lib
view libtwamr/calc_en.h @ 466:0c4e1bc06740
amrefr-encode-r: use the new DHF xform that matches T-Mobile
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 21:44:59 +0000 |
parents | 2df212a012af |
children |
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/* ******************************************************************************** * * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 * R99 Version 3.3.0 * REL-4 Version 4.1.0 * ******************************************************************************** * * File : calc_en.h * Purpose : calculation of energy coefficients for quantizers * ******************************************************************************** */ #ifndef calc_en_h #define calc_en_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * 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 */ ); /************************************************************************* * * 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 */ ); /************************************************************************* * * 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 */ ); #endif