Unhide the android.media.[Media]DataSource interface.

This allows apps to implement MediaDataSource, which is modeled on
stagefright's DataSource, to supply media data to the framework. This
was already implemented for MediaExtractor, but it was renamed from
DataSource.

MediaExtractor, MediaPlayer and MediaMetadataRetriever each have a new
overload: #setDataSource(android.media.MediaDataSource)

Only NuPlayer supports this new data source.

The change introduces:
 * IDataSource:        The binder interface for DataSource.
 * JMediaDataSource:   The native counterpart to the java interface. It
                       implements IDataSource.
 * CallbackDataSource: A stagefright DataSource that wraps an
                       IDataSource.

Change-Id: Ib3c944b49cc8a792c8eb9c85e5015c07f298ebc1

3 files changed, 53 insertions, 1 deletions

diff --git a/media/libstagefright/include/AwesomePlayer.h b/media/libstagefright/include/AwesomePlayer.h
index 77d65e0..4704ad3 100644
--- a/media/libstagefright/include/AwesomePlayer.h
+++ b/media/libstagefright/include/AwesomePlayer.h
@@ -33,7 +33,7 @@ namespace android {
 
 struct AudioPlayer;
 struct ClockEstimator;
-struct DataSource;
+struct IDataSource;
 struct MediaBuffer;
 struct MediaExtractor;
 struct MediaSource;
diff --git a/media/libstagefright/include/CallbackDataSource.h b/media/libstagefright/include/CallbackDataSource.h
new file mode 100644
index 0000000..678eb2e
--- /dev/null
+++ b/media/libstagefright/include/CallbackDataSource.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_CALLBACKDATASOURCE_H
+#define ANDROID_CALLBACKDATASOURCE_H
+
+#include <media/stagefright/DataSource.h>
+#include <media/stagefright/foundation/ADebug.h>
+
+namespace android {
+
+class IDataSource;
+class IMemory;
+
+// A stagefright DataSource that wraps a binder IDataSource. It's a "Callback"
+// DataSource because it calls back to the IDataSource for data.
+class CallbackDataSource : public DataSource {
+public:
+    CallbackDataSource(const sp<IDataSource>& iDataSource);
+    virtual ~CallbackDataSource();
+
+    // DataSource implementation.
+    virtual status_t initCheck() const;
+    virtual ssize_t readAt(off64_t offset, void *data, size_t size);
+    virtual status_t getSize(off64_t *size);
+
+private:
+    sp<IDataSource> mIDataSource;
+    sp<IMemory> mMemory;
+
+    DISALLOW_EVIL_CONSTRUCTORS(CallbackDataSource);
+};
+
+}; // namespace android
+
+#endif // ANDROID_CALLBACKDATASOURCE_H
diff --git a/media/libstagefright/include/StagefrightMetadataRetriever.h b/media/libstagefright/include/StagefrightMetadataRetriever.h
index 6632c27..96a35f3 100644
--- a/media/libstagefright/include/StagefrightMetadataRetriever.h
+++ b/media/libstagefright/include/StagefrightMetadataRetriever.h
@@ -38,6 +38,7 @@ struct StagefrightMetadataRetriever : public MediaMetadataRetrieverInterface {
             const KeyedVector<String8, String8> *headers);
 
     virtual status_t setDataSource(int fd, int64_t offset, int64_t length);
+    virtual status_t setDataSource(const sp<DataSource>& source);
 
     virtual VideoFrame *getFrameAtTime(int64_t timeUs, int option);
     virtual MediaAlbumArt *extractAlbumArt();
@@ -53,6 +54,8 @@ private:
     MediaAlbumArt *mAlbumArt;
 
     void parseMetaData();
+    // Delete album art and clear metadata.
+    void clearMetadata();
 
     StagefrightMetadataRetriever(const StagefrightMetadataRetriever &);