X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Faudio_filter.h;h=86fdce590cf0a5dc6eddba42ad8566779c332c73;hb=2e2f11b29651cffe37c64275dbd45c7563310020;hp=cc3734cde6ad86b7d0e82c2e85542674143f55b1;hpb=27173512f4ea4f2c324b9488180ba7cbd7173ec3;p=dcpomatic.git

diff --git a/src/lib/audio_filter.h b/src/lib/audio_filter.h
index cc3734cde..86fdce590 100644
--- a/src/lib/audio_filter.h
+++ b/src/lib/audio_filter.h
@@ -1,32 +1,42 @@
 /*
-    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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,
+    DCP-o-matic 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.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
-#include <boost/shared_ptr.hpp>
+#ifndef DCPOMATIC_AUDIO_FILTER_H
+#define DCPOMATIC_AUDIO_FILTER_H
+
+
+#include <memory>
 #include <vector>
 
+
 class AudioBuffers;
 struct audio_filter_impulse_input_test;
 
+
+/** An audio filter which can take AudioBuffers and apply some filtering operation,
+ *  returning filtered samples
+ */
 class AudioFilter
 {
 public:
-	AudioFilter (float transition_bandwidth)
+	explicit AudioFilter (float transition_bandwidth)
 	{
 		_M = 4 / transition_bandwidth;
 		if (_M % 2) {
@@ -34,7 +44,9 @@ public:
 		}
 	}
 
-	boost::shared_ptr<AudioBuffers> run (boost::shared_ptr<AudioBuffers> in);
+	virtual ~AudioFilter () {}
+
+	std::shared_ptr<AudioBuffers> run (std::shared_ptr<const AudioBuffers> in);
 
 	void flush ();
 
@@ -46,9 +58,10 @@ protected:
 
 	std::vector<float> _ir;
 	int _M;
-	boost::shared_ptr<AudioBuffers> _tail;
+	std::shared_ptr<AudioBuffers> _tail;
 };
 
+
 class LowPassAudioFilter : public AudioFilter
 {
 public:
@@ -59,6 +72,7 @@ public:
 	LowPassAudioFilter (float transition_bandwidth, float cutoff);
 };
 
+
 class HighPassAudioFilter : public AudioFilter
 {
 public:
@@ -69,6 +83,7 @@ public:
 	HighPassAudioFilter (float transition_bandwidth, float cutoff);
 };
 
+
 class BandPassAudioFilter : public AudioFilter
 {
 public:
@@ -79,3 +94,6 @@ public:
 	 */
 	BandPassAudioFilter (float transition_bandwidth, float lower, float higher);
 };
+
+
+#endif