Add support for the "compilation" tag in mp3, mp4 and ogg, and also add

support for two common ways of specifying album artist in ogg files.
b/3311831

Change-Id: Iba1152013b7577168af71f947d7249560419fa05

Author: marcone

core/java/android/provider/MediaStore.java

@@ -899,6 +899,13 @@ public interface AudioColumns extends MediaColumns {
              */
             public static final String ALBUM_ARTIST = "album_artist";
 
+            /**
+             * Whether the song is part of a compilation
+             * <P>Type: TEXT</P>
+             * @hide
+             */
+            public static final String COMPILATION = "compilation";
+
             /**
              * A non human readable key calculated from the ARTIST, used for
              * searching, sorting and grouping

include/media/mediametadataretriever.h

@@ -56,6 +56,7 @@ enum {
     METADATA_KEY_MIMETYPE        = 22,
     METADATA_KEY_DISC_NUMBER     = 23,
     METADATA_KEY_ALBUMARTIST     = 24,
+    METADATA_KEY_COMPILATION     = 25,
     // Add more here...
 };
 

include/media/stagefright/MetaData.h

@@ -73,6 +73,7 @@ enum {
     kKeyDiscNumber        = 'dnum',  // cstring
     kKeyDate              = 'date',  // cstring
     kKeyWriter            = 'writ',  // cstring
+    kKeyCompilation       = 'cpil',  // cstring
     kKeyTimeScale         = 'tmsl',  // int32_t
 
     // video profile and level

media/java/android/media/MediaMetadataRetriever.java

@@ -258,5 +258,6 @@ protected void finalize() throws Throwable {
     public static final int METADATA_KEY_MIMETYPE        = 22;
     public static final int METADATA_KEY_DISCNUMBER      = 23;
     public static final int METADATA_KEY_ALBUMARTIST     = 24;
+    public static final int METADATA_KEY_COMPILATION     = 25;
     // Add more here...
 }

media/libstagefright/MP3Extractor.cpp

@@ -743,6 +743,7 @@ sp<MetaData> MP3Extractor::getMetaData() {
         { kKeyAuthor, "TXT", "TEXT" },
         { kKeyCDTrackNumber, "TRK", "TRCK" },
         { kKeyDiscNumber, "TPA", "TPOS" },
+        { kKeyCompilation, "TCP", "TCMP" },
     };
     static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]);
 

media/libstagefright/MPEG4Extractor.cpp

@@ -1176,6 +1176,17 @@ status_t MPEG4Extractor::parseMetaData(off_t offset, size_t size) {
             metadataKey = kKeyGenre;
             break;
         }
+        case FOURCC('c', 'p', 'i', 'l'):
+        {
+            if (size == 9 && flags == 21) {
+                char tmp[16];
+                sprintf(tmp, "%d",
+                        (int)buffer[size - 1]);
+
+                mFileMetaData->setCString(kKeyCompilation, tmp);
+            }
+            break;
+        }
         case FOURCC('t', 'r', 'k', 'n'):
         {
             if (size == 16 && flags == 0) {

media/libstagefright/OggExtractor.cpp

@@ -660,6 +660,9 @@ void MyVorbisExtractor::parseFileMetaData() {
     } kMap[] = {
         { "TITLE", kKeyTitle },
         { "ARTIST", kKeyArtist },
+        { "ALBUMARTIST", kKeyAlbumArtist },
+        { "ALBUM ARTIST", kKeyAlbumArtist },
+        { "COMPILATION", kKeyCompilation },
         { "ALBUM", kKeyAlbum },
         { "COMPOSER", kKeyComposer },
         { "GENRE", kKeyGenre },

media/libstagefright/StagefrightMediaScanner.cpp

@@ -155,6 +155,7 @@ status_t StagefrightMediaScanner::processFile(
             { "year", METADATA_KEY_YEAR },
             { "duration", METADATA_KEY_DURATION },
             { "writer", METADATA_KEY_WRITER },
+            { "compilation", METADATA_KEY_COMPILATION },
         };
         static const size_t kNumEntries = sizeof(kKeyMap) / sizeof(kKeyMap[0]);
 

media/libstagefright/StagefrightMetadataRetriever.cpp

@@ -355,6 +355,7 @@ void StagefrightMetadataRetriever::parseMetaData() {
         { kKeyTitle, METADATA_KEY_TITLE },
         { kKeyYear, METADATA_KEY_YEAR },
         { kKeyWriter, METADATA_KEY_WRITER },
+        { kKeyCompilation, METADATA_KEY_COMPILATION },
     };
     static const size_t kNumMapEntries = sizeof(kMap) / sizeof(kMap[0]);