diff options
Diffstat (limited to 'libavcodec/acelp_pitch_delay.c')
| -rw-r--r-- | libavcodec/acelp_pitch_delay.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/libavcodec/acelp_pitch_delay.c b/libavcodec/acelp_pitch_delay.c index 1965772..3ecec01 100644 --- a/libavcodec/acelp_pitch_delay.c +++ b/libavcodec/acelp_pitch_delay.c @@ -3,25 +3,26 @@ * * Copyright (c) 2008 Vladimir Voroshilov * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/common.h" #include "libavutil/float_dsp.h" +#include "libavutil/libm.h" #include "libavutil/mathematics.h" #include "avcodec.h" #include "acelp_pitch_delay.h" @@ -107,9 +108,20 @@ int16_t ff_acelp_decode_gain_code( for(i=0; i<ma_pred_order; i++) mr_energy += quant_energy[i] * ma_prediction_coeff[i]; +#ifdef G729_BITEXACT + mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff); + + mr_energy = (5439 * (mr_energy >> 15)) >> 8; // (0.15) = (0.15) * (7.23) + + return bidir_sal( + ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1), + (mr_energy >> 15) - 25 + ); +#else mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) / sqrt(adsp->scalarproduct_int16(fc_v, fc_v, subframe_size)); return mr_energy >> 12; +#endif } float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy, |
