Basic support for calculating audio gains based on the sound processor's gain curve.

1 files changed, 103 insertions, 0 deletions

diff --git a/src/lib/sound_processor.cc b/src/lib/sound_processor.cc
new file mode 100644
index 000000000..9be6621cc
--- /dev/null
+++ b/src/lib/sound_processor.cc
@@ -0,0 +1,103 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    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.
+
+*/
+
+/** @file src/sound_processor.cc
+ *  @brief A class to describe a sound processor.
+ */
+
+#include <iostream>
+#include <cassert>
+#include "sound_processor.h"
+#include "dolby_cp750.h"
+
+using namespace std;
+
+vector<SoundProcessor const *> SoundProcessor::_sound_processors;
+
+/** @param i Our id.
+ *  @param n User-visible name.
+ */
+SoundProcessor::SoundProcessor (string i, string n)
+	: _id (i)
+	, _name (n)
+{
+
+}
+
+/** @return All available sound processors */
+vector<SoundProcessor const *>
+SoundProcessor::all ()
+{
+	return _sound_processors;
+}
+
+/** Set up the static _sound_processors vector; must be called before from_*
+ *  methods are used.
+ */
+void
+SoundProcessor::setup_sound_processors ()
+{
+	_sound_processors.push_back (new DolbyCP750);
+}
+
+/** @param id One of our ids.
+ *  @return Corresponding sound processor, or 0.
+ */
+SoundProcessor const *
+SoundProcessor::from_id (string id)
+{
+	vector<SoundProcessor const *>::iterator i = _sound_processors.begin ();
+	while (i != _sound_processors.end() && (*i)->id() != id) {
+		++i;
+	}
+
+	if (i == _sound_processors.end ()) {
+		return 0;
+	}
+
+	return *i;
+}
+
+/** @param s A sound processor from our static list.
+ *  @return Index of the sound processor with the list, or -1.
+ */
+int
+SoundProcessor::as_index (SoundProcessor const * s)
+{
+	vector<SoundProcessor*>::size_type i = 0;
+	while (i < _sound_processors.size() && _sound_processors[i] != s) {
+		++i;
+	}
+
+	if (i == _sound_processors.size ()) {
+		return -1;
+	}
+
+	return i;
+}
+
+/** @param i An index returned from as_index().
+ *  @return Corresponding sound processor.
+ */
+SoundProcessor const *
+SoundProcessor::from_index (int i)
+{
+	assert (i <= int(_sound_processors.size ()));
+	return _sound_processors[i];
+}