6 files changed, 9 insertions, 9 deletions
diff --git a/src/lib/audio_analysis.h b/src/lib/audio_analysis.h
index 038059502..29c32fa1c 100644
--- a/src/lib/audio_analysis.h
+++ b/src/lib/audio_analysis.h
@@ -57,11 +57,11 @@ public:
 		dcpomatic::DCPTime time;
 	};
 
-	void set_sample_peak (std::vector<PeakTime> peak) {
+	void set_sample_peak (std::vector<PeakTime> const& peak) {
 		_sample_peak = peak;
 	}
 
-	void set_true_peak (std::vector<float> peak) {
+	void set_true_peak (std::vector<float> const& peak) {
 		_true_peak = peak;
 	}
 
diff --git a/src/lib/audio_content.cc b/src/lib/audio_content.cc
index f2510b494..7f62fdf98 100644
--- a/src/lib/audio_content.cc
+++ b/src/lib/audio_content.cc
@@ -156,7 +156,7 @@ AudioContent::technical_summary () const
 
 
 void
-AudioContent::set_mapping (AudioMapping mapping)
+AudioContent::set_mapping (AudioMapping const& mapping)
 {
 	ContentChangeSignaller cc (_parent, AudioContentProperty::STREAMS);
 
@@ -343,7 +343,7 @@ AudioContent::add_properties (shared_ptr<const Film> film, list<UserProperty>& p
 
 
 void
-AudioContent::set_streams (vector<AudioStreamPtr> streams)
+AudioContent::set_streams (vector<AudioStreamPtr> const& streams)
 {
 	ContentChangeSignaller cc (_parent, AudioContentProperty::STREAMS);
 
diff --git a/src/lib/audio_content.h b/src/lib/audio_content.h
index 963f759e8..41588fd68 100644
--- a/src/lib/audio_content.h
+++ b/src/lib/audio_content.h
@@ -57,7 +57,7 @@ public:
 	void take_settings_from (std::shared_ptr<const AudioContent> c);
 
 	AudioMapping mapping () const;
-	void set_mapping (AudioMapping);
+	void set_mapping (AudioMapping const&);
 	int resampled_frame_rate (std::shared_ptr<const Film> film) const;
 	std::vector<NamedChannel> channel_names () const;
 
@@ -86,7 +86,7 @@ public:
 
 	void add_stream (AudioStreamPtr stream);
 	void set_stream (AudioStreamPtr stream);
-	void set_streams (std::vector<AudioStreamPtr> streams);
+	void set_streams (std::vector<AudioStreamPtr> const& streams);
 	AudioStreamPtr stream () const;
 
 	void add_properties (std::shared_ptr<const Film> film, std::list<UserProperty> &) const;
diff --git a/src/lib/content_text.h b/src/lib/content_text.h
index 5edb9af20..bc5a6ed99 100644
--- a/src/lib/content_text.h
+++ b/src/lib/content_text.h
@@ -64,7 +64,7 @@ public:
 class ContentStringText : public ContentText
 {
 public:
-	ContentStringText (dcpomatic::ContentTime f, std::list<dcp::SubtitleString> s)
+	ContentStringText (dcpomatic::ContentTime f, std::list<dcp::SubtitleString> const& s)
 		: ContentText (f)
 		, subs (s)
 	{}
diff --git a/src/lib/util.cc b/src/lib/util.cc
index c165a5129..64450f987 100644
--- a/src/lib/util.cc
+++ b/src/lib/util.cc
@@ -846,7 +846,7 @@ audio_channel_types (list<int> mapped, int channels)
 }
 
 shared_ptr<AudioBuffers>
-remap (shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping map)
+remap (shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping const& map)
 {
 	auto mapped = make_shared<AudioBuffers>(output_channels, input->frames());
 	mapped->make_silent ();
diff --git a/src/lib/util.h b/src/lib/util.h
index 112451f7b..9620c839a 100644
--- a/src/lib/util.h
+++ b/src/lib/util.h
@@ -115,7 +115,7 @@ extern std::string atmos_asset_filename (std::shared_ptr<dcp::AtmosAsset> asset,
 extern float relaxed_string_to_float (std::string);
 extern std::string careful_string_filter (std::string);
 extern std::pair<int, int> audio_channel_types (std::list<int> mapped, int channels);
-extern std::shared_ptr<AudioBuffers> remap (std::shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping map);
+extern std::shared_ptr<AudioBuffers> remap (std::shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping const& map);
 extern Eyes increment_eyes (Eyes e);
 extern void checked_fread (void* ptr, size_t size, FILE* stream, boost::filesystem::path path);
 extern void checked_fwrite (void const * ptr, size_t size, FILE* stream, boost::filesystem::path path);