X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Faudio_filter.h;h=640e910ca83445ff970d7fe3a766385c6c98ea02;hb=bdbe925a467f9b7149322ad8d1c090d4c1e6d5c3;hp=f361c27d2cf837508e53887ec7b97600b9310b68;hpb=94201bd2a5a4cb391b7f2bdeba56b928fed7cfe1;p=dcpomatic.git

diff --git a/src/lib/audio_filter.h b/src/lib/audio_filter.h
index f361c27d2..640e910ca 100644
--- a/src/lib/audio_filter.h
+++ b/src/lib/audio_filter.h
@@ -17,12 +17,14 @@
 
 */
 
-#include <vector>
+#ifndef DCPOMATIC_AUDIO_FILTER_H
+#define DCPOMATIC_AUDIO_FILTER_H
+
 #include <boost/shared_ptr.hpp>
+#include <vector>
 
 class AudioBuffers;
-class audio_filter_impulse_kernel_test;
-class audio_filter_impulse_input_test;
+struct audio_filter_impulse_input_test;
 
 class AudioFilter
 {
@@ -35,13 +37,13 @@ public:
 		}
 	}
 
-	boost::shared_ptr<AudioBuffers> run (boost::shared_ptr<AudioBuffers> in);
+	boost::shared_ptr<AudioBuffers> run (boost::shared_ptr<const AudioBuffers> in);
 
 	void flush ();
 
 protected:
-	friend class audio_filter_impulse_kernel_test;
-	friend class audio_filter_impulse_input_test;
+	friend struct audio_filter_impulse_kernel_test;
+	friend struct audio_filter_impulse_input_test;
 
 	std::vector<float> sinc_blackman (float cutoff, bool invert) const;
 
@@ -80,3 +82,5 @@ public:
 	 */
 	BandPassAudioFilter (float transition_bandwidth, float lower, float higher);
 };
+
+#endif