X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Faudio_mapping.cc;h=e86e2e2ac6820499cd551ddaed17ffe8e7f30019;hb=5dc2dbdb6639f8d617a40209ad603d2a38f9df2a;hp=7d7e9f82863794b6495f368a677402793d8b5160;hpb=bb0a36c3a6bea9cd1ebdde7b8a3a04765e317569;p=dcpomatic.git

diff --git a/src/lib/audio_mapping.cc b/src/lib/audio_mapping.cc
index 7d7e9f828..e86e2e2ac 100644
--- a/src/lib/audio_mapping.cc
+++ b/src/lib/audio_mapping.cc
@@ -22,6 +22,7 @@
 #include <dcp/raw_convert.h>
 #include "audio_mapping.h"
 #include "util.h"
+#include "md5_digester.h"
 
 using std::list;
 using std::cout;
@@ -39,7 +40,7 @@ AudioMapping::AudioMapping ()
 
 }
 
-/** Create a default AudioMapping for a given channel count.
+/** Create an empty AudioMapping for a given channel count.
  *  @param channels Number of channels.
  */
 AudioMapping::AudioMapping (int channels)
@@ -126,3 +127,20 @@ AudioMapping::as_xml (xmlpp::Node* node) const
 		}
 	}
 }
+
+/** @return a string which is unique for a given AudioMapping configuration, for
+ *  differentiation between different AudioMappings.
+ */
+string
+AudioMapping::digest () const
+{
+	MD5Digester digester;
+	digester.add (_content_channels);
+	for (int i = 0; i < _content_channels; ++i) {
+		for (int j = 0; j < MAX_DCP_AUDIO_CHANNELS; ++j) {
+			digester.add (_gain[i][j]);
+		}
+	}
+
+	return digester.get ();
+}