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Diffstat (limited to 'libs/ardour/amp.cc')
-rw-r--r-- | libs/ardour/amp.cc | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc deleted file mode 100644 index a2ad70e8b1..0000000000 --- a/libs/ardour/amp.cc +++ /dev/null @@ -1,102 +0,0 @@ -/* - Copyright (C) 2006 Paul Davis - - 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 the Free - Software Foundation; either version 2 of the License, or (at your option) - any later version. - - This program 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 General Public License - for more details. - - You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, Inc., - 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include <cstring> -#include <cmath> -#include <algorithm> -#include <ardour/amp.h> -#include <ardour/buffer_set.h> -#include <ardour/audio_buffer.h> - -namespace ARDOUR { - - -/** Apply a declicked gain to the audio buffers of @a bufs */ -void -Amp::run_in_place (BufferSet& bufs, nframes_t nframes, gain_t initial, gain_t target, bool invert_polarity) -{ - if (nframes == 0) - return; - - if (bufs.count().n_audio() == 0) - return; - - // assert(bufs.buffer_capacity(DataType::AUDIO) >= nframes); - - // if we don't need to declick, defer to apply_simple_gain - if (initial == target) { - if (target == 0.0) { - for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) { - memset (i->data(), 0, sizeof (Sample) * nframes); - } - } else if (target != 1.0) { - for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) { - apply_gain_to_buffer (i->data(), nframes, target); - } - } - return; - } - - const nframes_t declick = std::min ((nframes_t)128, nframes); - gain_t delta; - double fractional_shift = -1.0/declick; - double fractional_pos; - gain_t polscale = invert_polarity ? -1.0f : 1.0f; - - if (target < initial) { - /* fade out: remove more and more of delta from initial */ - delta = -(initial - target); - } else { - /* fade in: add more and more of delta from initial */ - delta = target - initial; - } - - for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) { - Sample* const buffer = i->data(); - - fractional_pos = 1.0; - - for (nframes_t nx = 0; nx < declick; ++nx) { - buffer[nx] *= polscale * (initial + (delta * (0.5 + 0.5 * cos (M_PI * fractional_pos)))); - fractional_pos += fractional_shift; - } - - /* now ensure the rest of the buffer has the target value applied, if necessary. */ - - if (declick != nframes) { - - if (invert_polarity) { - target = -target; - } - - if (target == 0.0) { - memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick)); - } else if (target != 1.0) { - apply_gain_to_buffer (&buffer[declick], nframes - declick, target); - } - } - } -} - -void -Amp::apply_simple_gain (BufferSet& bufs, nframes_t nframes, gain_t target) -{ -} - - -} // namespace ARDOUR |