From e2b1028852120bcfded33b8f06f66b780437fe92 Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Tue, 23 Nov 2010 11:41:34 -0800
Subject: Support streaming data across binder boundaries.

Change-Id: Ifbac61406dcb81343765f99ccba08bd90f9274cc
---
 media/libmedia/IStreamSource.cpp | 168 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 media/libmedia/IStreamSource.cpp

(limited to 'media/libmedia/IStreamSource.cpp')

diff --git a/media/libmedia/IStreamSource.cpp b/media/libmedia/IStreamSource.cpp
new file mode 100644
index 0000000..89f2b44
--- /dev/null
+++ b/media/libmedia/IStreamSource.cpp
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2010 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 "IStreamSource"
+#include <utils/Log.h>
+
+#include <media/IStreamSource.h>
+
+#include <binder/IMemory.h>
+#include <binder/Parcel.h>
+
+namespace android {
+
+enum {
+    // IStreamSource
+    SET_LISTENER = IBinder::FIRST_CALL_TRANSACTION,
+    SET_BUFFERS,
+    ON_BUFFER_AVAILABLE,
+
+    // IStreamListener
+    QUEUE_BUFFER,
+    QUEUE_COMMAND,
+};
+
+struct BpStreamSource : public BpInterface<IStreamSource> {
+    BpStreamSource(const sp<IBinder> &impl)
+        : BpInterface<IStreamSource>(impl) {
+    }
+
+    virtual void setListener(const sp<IStreamListener> &listener) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IStreamSource::getInterfaceDescriptor());
+        data.writeStrongBinder(listener->asBinder());
+        remote()->transact(SET_LISTENER, data, &reply);
+    }
+
+    virtual void setBuffers(const Vector<sp<IMemory> > &buffers) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IStreamSource::getInterfaceDescriptor());
+        data.writeInt32(static_cast<int32_t>(buffers.size()));
+        for (size_t i = 0; i < buffers.size(); ++i) {
+            data.writeStrongBinder(buffers.itemAt(i)->asBinder());
+        }
+        remote()->transact(SET_BUFFERS, data, &reply);
+    }
+
+    virtual void onBufferAvailable(size_t index) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IStreamSource::getInterfaceDescriptor());
+        data.writeInt32(static_cast<int32_t>(index));
+        remote()->transact(
+                ON_BUFFER_AVAILABLE, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+};
+
+IMPLEMENT_META_INTERFACE(StreamSource, "android.hardware.IStreamSource");
+
+status_t BnStreamSource::onTransact(
+        uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
+    switch (code) {
+        case SET_LISTENER:
+        {
+            CHECK_INTERFACE(IStreamSource, data, reply);
+            setListener(
+                    interface_cast<IStreamListener>(data.readStrongBinder()));
+            break;
+        }
+
+        case SET_BUFFERS:
+        {
+            CHECK_INTERFACE(IStreamSource, data, reply);
+            size_t n = static_cast<size_t>(data.readInt32());
+            Vector<sp<IMemory> > buffers;
+            for (size_t i = 0; i < n; ++i) {
+                sp<IMemory> mem =
+                    interface_cast<IMemory>(data.readStrongBinder());
+
+                buffers.push(mem);
+            }
+            setBuffers(buffers);
+            break;
+        }
+
+        case ON_BUFFER_AVAILABLE:
+        {
+            CHECK_INTERFACE(IStreamSource, data, reply);
+            onBufferAvailable(static_cast<size_t>(data.readInt32()));
+            break;
+        }
+
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+
+    return OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct BpStreamListener : public BpInterface<IStreamListener> {
+    BpStreamListener(const sp<IBinder> &impl)
+        : BpInterface<IStreamListener>(impl) {
+    }
+
+    virtual void queueBuffer(size_t index, size_t size) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IStreamListener::getInterfaceDescriptor());
+        data.writeInt32(static_cast<int32_t>(index));
+        data.writeInt32(static_cast<int32_t>(size));
+
+        remote()->transact(QUEUE_BUFFER, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+
+    virtual void queueCommand(Command cmd) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IStreamListener::getInterfaceDescriptor());
+        data.writeInt32(static_cast<int32_t>(cmd));
+
+        remote()->transact(QUEUE_COMMAND, data, &reply, IBinder::FLAG_ONEWAY);
+    }
+};
+
+IMPLEMENT_META_INTERFACE(StreamListener, "android.hardware.IStreamListener");
+
+status_t BnStreamListener::onTransact(
+        uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
+    switch (code) {
+        case QUEUE_BUFFER:
+        {
+            CHECK_INTERFACE(IStreamListener, data, reply);
+            size_t index = static_cast<size_t>(data.readInt32());
+            size_t size = static_cast<size_t>(data.readInt32());
+
+            queueBuffer(index, size);
+            break;
+        }
+
+        case QUEUE_COMMAND:
+        {
+            CHECK_INTERFACE(IStreamListener, data, reply);
+            Command cmd = static_cast<Command>(data.readInt32());
+
+            queueCommand(cmd);
+            break;
+        }
+
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+
+    return OK;
+}
+
+}  // namespace android
-- 
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