2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 using boost::shared_ptr;
24 /** @param gain gain in dB */
25 Gain::Gain (shared_ptr<Log> log, float gain)
26 : AudioProcessor (log)
33 Gain::process_audio (shared_ptr<AudioBuffers> b)
36 float const linear_gain = pow (10, _gain / 20);
37 for (int i = 0; i < b->channels(); ++i) {
38 for (int j = 0; j < b->frames(); ++j) {
39 b->data(i)[j] *= linear_gain;