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

1 files changed, 108 insertions, 0 deletions

diff --git a/media/libmedia/IDataSource.cpp b/media/libmedia/IDataSource.cpp
new file mode 100644
index 0000000..76d1d68
--- /dev/null
+++ b/media/libmedia/IDataSource.cpp
@@ -0,0 +1,108 @@
+/*
+ * 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.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "IDataSource"
+#include <utils/Log.h>
+#include <utils/Timers.h>
+
+#include <media/IDataSource.h>
+
+#include <binder/IMemory.h>
+#include <binder/Parcel.h>
+#include <media/stagefright/foundation/ADebug.h>
+
+namespace android {
+
+enum {
+    GET_IMEMORY = IBinder::FIRST_CALL_TRANSACTION,
+    READ_AT,
+    GET_SIZE,
+    CLOSE,
+};
+
+struct BpDataSource : public BpInterface<IDataSource> {
+    BpDataSource(const sp<IBinder>& impl) : BpInterface<IDataSource>(impl) {}
+
+    virtual sp<IMemory> getIMemory() {
+        Parcel data, reply;
+        data.writeInterfaceToken(IDataSource::getInterfaceDescriptor());
+        remote()->transact(GET_IMEMORY, data, &reply);
+        sp<IBinder> binder = reply.readStrongBinder();
+        return interface_cast<IMemory>(binder);
+    }
+
+    virtual ssize_t readAt(off64_t offset, size_t size) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IDataSource::getInterfaceDescriptor());
+        data.writeInt64(offset);
+        data.writeInt64(size);
+        remote()->transact(READ_AT, data, &reply);
+        return reply.readInt64();
+    }
+
+    virtual status_t getSize(off64_t* size) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IDataSource::getInterfaceDescriptor());
+        remote()->transact(GET_SIZE, data, &reply);
+        status_t err = reply.readInt32();
+        *size = reply.readInt64();
+        return err;
+    }
+
+    virtual void close() {
+        Parcel data, reply;
+        data.writeInterfaceToken(IDataSource::getInterfaceDescriptor());
+        remote()->transact(CLOSE, data, &reply);
+    }
+};
+
+IMPLEMENT_META_INTERFACE(DataSource, "android.media.IDataSource");
+
+status_t BnDataSource::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) {
+    switch (code) {
+        case GET_IMEMORY: {
+            CHECK_INTERFACE(IDataSource, data, reply);
+            reply->writeStrongBinder(IInterface::asBinder(getIMemory()));
+            return NO_ERROR;
+        } break;
+        case READ_AT: {
+            CHECK_INTERFACE(IDataSource, data, reply);
+            off64_t offset = (off64_t) data.readInt64();
+            size_t size = (size_t) data.readInt64();
+            reply->writeInt64(readAt(offset, size));
+            return NO_ERROR;
+        } break;
+        case GET_SIZE: {
+            CHECK_INTERFACE(IDataSource, data, reply);
+            off64_t size;
+            status_t err = getSize(&size);
+            reply->writeInt32(err);
+            reply->writeInt64(size);
+            return NO_ERROR;
+        } break;
+        case CLOSE: {
+            CHECK_INTERFACE(IDataSource, data, reply);
+            close();
+            return NO_ERROR;
+        } break;
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+}
+
+}  // namespace android