AiffAudioFormat: support for reading CATE block metadata.

modules/juce_audio_formats/codecs/juce_AiffAudioFormat.cpp

@@ -194,6 +194,50 @@ namespace AiffFileHelpers
     #pragma pack (pop)
    #endif
 
+    //==============================================================================
+    static String readCATEChunk (InputStream& input, const uint32 length)
+    {
+        MemoryBlock mb;
+        input.skipNextBytes (4);
+        input.readIntoMemoryBlock (mb, length - 4);
+
+        static const char* appleGenres[] =
+        {
+            "Rock/Blues",
+            "Electronic/Dance",
+            "Jazz",
+            "Urban",
+            "World/Ethnic",
+            "Cinematic/New Age",
+            "Orchestral",
+            "Country/Folk",
+            "Experimental",
+            "Other Genre",
+            nullptr
+        };
+
+        const StringArray genres (appleGenres);
+        StringArray tagsArray;
+
+        int bytesLeft = (int) mb.getSize();
+        const char* data = static_cast <const char*> (mb.getData());
+
+        while (bytesLeft > 0)
+        {
+            const String tag (CharPointer_UTF8 (data),
+                              CharPointer_UTF8 (data + bytesLeft));
+
+            if (tag.isNotEmpty())
+                tagsArray.add (data);
+
+            const int numBytesInTag = genres.contains (tag) ? 118 : 50;
+            data += numBytesInTag;
+            bytesLeft -= numBytesInTag;
+        }
+
+        return tagsArray.joinIntoString (";");
+    }
+
     //==============================================================================
     namespace MarkChunk
     {
@@ -473,6 +517,11 @@ public:
                     {
                         AiffFileHelpers::BASCChunk (*input).addToMetadata (metadataValues);
                     }
+                    else if (type == chunkName ("cate"))
+                    {
+                        metadataValues.set (AiffAudioFormat::appleTag,
+                                            AiffFileHelpers::readCATEChunk (*input, length));;
+                    }
                     else if ((hasGotVer && hasGotData && hasGotType)
                               || chunkEnd < input->getPosition()
                               || input->isExhausted())