diff options
Diffstat (limited to 'src/libfaad/sbr_hfgen.c')
| -rw-r--r-- | src/libfaad/sbr_hfgen.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/src/libfaad/sbr_hfgen.c b/src/libfaad/sbr_hfgen.c index ed5f4135f..588d693df 100644 --- a/src/libfaad/sbr_hfgen.c +++ b/src/libfaad/sbr_hfgen.c @@ -1,6 +1,6 @@ /* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding -** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com +** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by @@ -22,7 +22,7 @@ ** Commercial non-GPL licensing of this software is possible. ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. ** -** $Id: sbr_hfgen.c,v 1.1 2003/12/30 02:00:11 miguelfreitas Exp $ +** $Id: sbr_hfgen.c,v 1.2 2004/01/11 15:44:05 mroi Exp $ **/ /* High Frequency generation */ @@ -36,7 +36,22 @@ #include "sbr_hfgen.h" #include "sbr_fbt.h" -void hf_generation(sbr_info *sbr, const qmf_t Xlow[MAX_NTSRHFG][32], + +/* static function declarations */ +static void calc_prediction_coef(sbr_info *sbr, qmf_t Xlow[MAX_NTSRHFG][32], + complex_t *alpha_0, complex_t *alpha_1 +#ifdef SBR_LOW_POWER + , real_t *rxx +#endif + ); +#ifdef SBR_LOW_POWER +static void calc_aliasing_degree(sbr_info *sbr, real_t *rxx, real_t *deg); +#endif +static void calc_chirp_factors(sbr_info *sbr, uint8_t ch); +static void patch_construction(sbr_info *sbr); + + +void hf_generation(sbr_info *sbr, qmf_t Xlow[MAX_NTSRHFG][32], qmf_t Xhigh[MAX_NTSRHFG][64] #ifdef SBR_LOW_POWER ,real_t *deg @@ -172,7 +187,7 @@ typedef struct #ifdef SBR_LOW_POWER static void auto_correlation(sbr_info *sbr, acorr_coef *ac, - const qmf_t buffer[MAX_NTSRHFG][32], + qmf_t buffer[MAX_NTSRHFG][32], uint8_t bd, uint8_t len) { real_t r01 = 0, r02 = 0, r11 = 0; @@ -180,6 +195,7 @@ static void auto_correlation(sbr_info *sbr, acorr_coef *ac, uint8_t offset = sbr->tHFAdj; const real_t rel = 1 / (1 + 1e-6f); + for (j = offset; j < len + offset; j++) { r01 += QMF_RE(buffer[j][bd]) * QMF_RE(buffer[j-1][bd]); @@ -199,7 +215,7 @@ static void auto_correlation(sbr_info *sbr, acorr_coef *ac, ac->det = MUL_R(RE(ac->r11), RE(ac->r22)) - MUL_C(MUL_R(RE(ac->r12), RE(ac->r12)), rel); } #else -static void auto_correlation(sbr_info *sbr, acorr_coef *ac, const qmf_t buffer[MAX_NTSRHFG][32], +static void auto_correlation(sbr_info *sbr, acorr_coef *ac, qmf_t buffer[MAX_NTSRHFG][32], uint8_t bd, uint8_t len) { real_t r01r = 0, r01i = 0, r02r = 0, r02i = 0, r11r = 0; @@ -243,7 +259,7 @@ static void auto_correlation(sbr_info *sbr, acorr_coef *ac, const qmf_t buffer[M #endif /* calculate linear prediction coefficients using the covariance method */ -static void calc_prediction_coef(sbr_info *sbr, const qmf_t Xlow[MAX_NTSRHFG][32], +static void calc_prediction_coef(sbr_info *sbr, qmf_t Xlow[MAX_NTSRHFG][32], complex_t *alpha_0, complex_t *alpha_1 #ifdef SBR_LOW_POWER , real_t *rxx |