1 files changed, 99 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/objectdescriptors/BaseDescriptor.java b/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/objectdescriptors/BaseDescriptor.java
new file mode 100644
index 0000000..6d94680
--- /dev/null
+++ b/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/objectdescriptors/BaseDescriptor.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2011 castLabs, Berlin
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.googlecode.mp4parser.boxes.mp4.objectdescriptors;
+
+import com.coremedia.iso.IsoTypeReader;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/*
+abstract aligned(8) expandable(228-1) class BaseDescriptor : bit(8) tag=0 {
+// empty. To be filled by classes extending this class.
+}
+
+int sizeOfInstance = 0;
+bit(1) nextByte;
+bit(7) sizeOfInstance;
+while(nextByte) {
+bit(1) nextByte;
+bit(7) sizeByte;
+sizeOfInstance = sizeOfInstance<<7 | sizeByte;
+}
+ */
+@Descriptor(tags = 0x00)
+public abstract class BaseDescriptor {
+    int tag;
+    int sizeOfInstance;
+    int sizeBytes;
+
+    public BaseDescriptor() {
+    }
+
+    public int getTag() {
+        return tag;
+    }
+
+    public int getSize() {
+        return sizeOfInstance
+                + 1//1 for the tag
+                + sizeBytes;
+    }
+
+    public int getSizeOfInstance() {
+        return sizeOfInstance;
+    }
+
+    public int getSizeBytes() {
+        return sizeBytes;
+    }
+
+    public final void parse(int tag, ByteBuffer bb) throws IOException {
+        this.tag = tag;
+
+        int i = 0;
+        int tmp = IsoTypeReader.readUInt8(bb);
+        i++;
+        sizeOfInstance = tmp & 0x7f;
+        while (tmp >>> 7 == 1) { //nextbyte indicator bit
+            tmp = IsoTypeReader.readUInt8(bb);
+            i++;
+            //sizeOfInstance = sizeOfInstance<<7 | sizeByte;
+            sizeOfInstance = sizeOfInstance << 7 | tmp & 0x7f;
+        }
+        sizeBytes = i;
+        ByteBuffer detailSource = bb.slice();
+        detailSource.limit(sizeOfInstance);
+        parseDetail(detailSource);
+        assert detailSource.remaining() == 0: this.getClass().getSimpleName() + " has not been fully parsed";
+        bb.position(bb.position() + sizeOfInstance);
+    }
+    
+    public abstract void parseDetail(ByteBuffer bb) throws IOException;
+
+
+
+    @Override
+    public String toString() {
+        final StringBuilder sb = new StringBuilder();
+        sb.append("BaseDescriptor");
+        sb.append("{tag=").append(tag);
+        sb.append(", sizeOfInstance=").append(sizeOfInstance);
+        sb.append('}');
+        return sb.toString();
+    }
+}