From d71a1be83ff31cdb6599c351f9832cefc8d447ba Mon Sep 17 00:00:00 2001
From: Eric Laurent <elaurent@google.com>
Date: Fri, 21 May 2010 07:47:50 -0700
Subject: Fix issue 2667797: [Audio Effect Framework] new base class and binder
 interfaces for effect control.

Added IEffect and IEffectClient binder interfaces to exchange effect module control
and status information between application and media server processes.

Change-Id: I10e8e894898e52ed9956a765d0ef7075eb2593af
---
 media/libmedia/IEffect.cpp | 191 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 media/libmedia/IEffect.cpp

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

diff --git a/media/libmedia/IEffect.cpp b/media/libmedia/IEffect.cpp
new file mode 100644
index 0000000..8e3ac71
--- /dev/null
+++ b/media/libmedia/IEffect.cpp
@@ -0,0 +1,191 @@
+/*
+**
+** Copyright 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 "IEffect"
+#include <utils/Log.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <binder/Parcel.h>
+#include <media/IEffect.h>
+
+namespace android {
+
+enum {
+    ENABLE = IBinder::FIRST_CALL_TRANSACTION,
+    DISABLE,
+    COMMAND,
+    DISCONNECT,
+    GET_CBLK
+};
+
+class BpEffect: public BpInterface<IEffect>
+{
+public:
+    BpEffect(const sp<IBinder>& impl)
+        : BpInterface<IEffect>(impl)
+    {
+    }
+
+    status_t enable()
+    {
+        LOGV("enable");
+        Parcel data, reply;
+        data.writeInterfaceToken(IEffect::getInterfaceDescriptor());
+        remote()->transact(ENABLE, data, &reply);
+        return reply.readInt32();
+    }
+
+    status_t disable()
+    {
+        LOGV("disable");
+        Parcel data, reply;
+        data.writeInterfaceToken(IEffect::getInterfaceDescriptor());
+        remote()->transact(DISABLE, data, &reply);
+        return reply.readInt32();
+    }
+
+    status_t command(int cmdCode, int cmdSize, void *pCmdData, int *pReplySize, void *pReplyData)
+    {
+        LOGV("command");
+        Parcel data, reply;
+        data.writeInterfaceToken(IEffect::getInterfaceDescriptor());
+        data.writeInt32(cmdCode);
+        int size = cmdSize;
+        if (pCmdData == NULL) {
+            size = 0;
+        }
+        data.writeInt32(size);
+        if (size) {
+            data.write(pCmdData, size);
+        }
+        if (pReplySize == NULL) {
+            size = 0;
+        } else {
+            size = *pReplySize;
+        }
+        data.writeInt32(size);
+        remote()->transact(COMMAND, data, &reply);
+        status_t status = reply.readInt32();
+        size = reply.readInt32();
+        if (size != 0 && pReplyData != NULL && pReplySize != NULL) {
+            reply.read(pReplyData, size);
+            *pReplySize = size;
+        }
+        return status;
+    }
+
+    void disconnect()
+    {
+        LOGV("disconnect");
+        Parcel data, reply;
+        data.writeInterfaceToken(IEffect::getInterfaceDescriptor());
+        remote()->transact(DISCONNECT, data, &reply);
+        return;
+    }
+
+    virtual sp<IMemory> getCblk() const
+    {
+        Parcel data, reply;
+        sp<IMemory> cblk;
+        data.writeInterfaceToken(IEffect::getInterfaceDescriptor());
+        status_t status = remote()->transact(GET_CBLK, data, &reply);
+        if (status == NO_ERROR) {
+            cblk = interface_cast<IMemory>(reply.readStrongBinder());
+        }
+        return cblk;
+    }
+ };
+
+IMPLEMENT_META_INTERFACE(Effect, "android.media.IEffect");
+
+// ----------------------------------------------------------------------
+
+status_t BnEffect::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch(code) {
+        case ENABLE: {
+            LOGV("ENABLE");
+            CHECK_INTERFACE(IEffect, data, reply);
+            reply->writeInt32(enable());
+            return NO_ERROR;
+        } break;
+
+        case DISABLE: {
+            LOGV("DISABLE");
+            CHECK_INTERFACE(IEffect, data, reply);
+            reply->writeInt32(disable());
+            return NO_ERROR;
+        } break;
+
+        case COMMAND: {
+            LOGV("COMMAND");
+            CHECK_INTERFACE(IEffect, data, reply);
+            int cmdCode = data.readInt32();
+            int cmdSize = data.readInt32();
+            char *cmd = NULL;
+            if (cmdSize) {
+                cmd = (char *)malloc(cmdSize);
+                data.read(cmd, cmdSize);
+            }
+            int replySize = data.readInt32();
+            int replySz = replySize;
+            char *resp = NULL;
+            if (replySize) {
+                resp = (char *)malloc(replySize);
+            }
+            status_t status = command(cmdCode, cmdSize, cmd, &replySz, resp);
+            reply->writeInt32(status);
+            if (replySz < replySize) {
+                replySize = replySz;
+            }
+            reply->writeInt32(replySize);
+            if (replySize) {
+                reply->write(resp, replySize);
+            }
+            if (cmd) {
+                free(cmd);
+            }
+            if (resp) {
+                free(resp);
+            }
+            return NO_ERROR;
+        } break;
+
+        case DISCONNECT: {
+            LOGV("DISCONNECT");
+            CHECK_INTERFACE(IEffect, data, reply);
+            disconnect();
+            return NO_ERROR;
+        } break;
+
+        case GET_CBLK: {
+             CHECK_INTERFACE(IEffect, data, reply);
+             reply->writeStrongBinder(getCblk()->asBinder());
+             return NO_ERROR;
+         } break;
+
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+}; // namespace android
+
-- 
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