Squashed commit of the following:

commit 543e192bf2ae13f573dc4c4e53b239ed4ea00e81
Author: Andreas Huber <andih@google.com>
Date:   Thu Dec 3 11:33:57 2009 -0800

    stagefright now acts as the OMX Master, vendors supply their own plugins through libstagefrighthw. In OpenCore-enabled builds we now sit on top of PVMaster...

commit 3cbfdbd9cecadbb77b63125c62883bf1065884fe
Author: Andreas Huber <andih@google.com>
Date:   Wed Dec 2 12:39:07 2009 -0800

    More OMX infrastructure, stagefright is now taking over the OMX Master, multiplexing all contributing OMX implementations under a common interface.

1 files changed, 144 insertions, 0 deletions

diff --git a/media/libstagefright/omx/OMXMaster.cpp b/media/libstagefright/omx/OMXMaster.cpp
new file mode 100644
index 0000000..838a9f7
--- /dev/null
+++ b/media/libstagefright/omx/OMXMaster.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2009 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.
+ */
+
+#include "OMXMaster.h"
+
+#include <dlfcn.h>
+
+#include <media/stagefright/MediaDebug.h>
+
+#ifndef NO_OPENCORE
+#include "OMXPVCodecsPlugin.h"
+#endif
+
+#include "OMXSoftwareCodecsPlugin.h"
+
+namespace android {
+
+OMXMaster::OMXMaster()
+    : mVendorLibHandle(NULL) {
+    addPlugin(new OMXSoftwareCodecsPlugin);
+
+    addVendorPlugin();
+
+#ifndef NO_OPENCORE
+    addPlugin(new OMXPVCodecsPlugin);
+#endif
+}
+
+OMXMaster::~OMXMaster() {
+    clearPlugins();
+
+    if (mVendorLibHandle != NULL) {
+        dlclose(mVendorLibHandle);
+        mVendorLibHandle = NULL;
+    }
+}
+
+void OMXMaster::addVendorPlugin() {
+    mVendorLibHandle = dlopen("libstagefrighthw.so", RTLD_NOW);
+
+    if (mVendorLibHandle == NULL) {
+        return;
+    }
+
+    typedef OMXPluginBase *(*CreateOMXPluginFunc)();
+    CreateOMXPluginFunc createOMXPlugin =
+        (CreateOMXPluginFunc)dlsym(
+                mVendorLibHandle, "_ZN7android15createOMXPluginEv");
+
+    addPlugin((*createOMXPlugin)());
+}
+
+void OMXMaster::addPlugin(OMXPluginBase *plugin) {
+    Mutex::Autolock autoLock(mLock);
+
+    mPlugins.push_back(plugin);
+
+    OMX_U32 index = 0;
+
+    char name[128];
+    OMX_ERRORTYPE err;
+    while ((err = plugin->enumerateComponents(
+                    name, sizeof(name), index++)) == OMX_ErrorNone) {
+        String8 name8(name);
+
+        if (mPluginByComponentName.indexOfKey(name8) >= 0) {
+            LOGE("A component of name '%s' already exists, ignoring this one.",
+                 name8.string());
+
+            continue;
+        }
+
+        mPluginByComponentName.add(name8, plugin);
+    }
+    CHECK_EQ(err, OMX_ErrorNoMore);
+}
+
+void OMXMaster::clearPlugins() {
+    Mutex::Autolock autoLock(mLock);
+
+    mPluginByComponentName.clear();
+
+    for (List<OMXPluginBase *>::iterator it = mPlugins.begin();
+         it != mPlugins.end(); ++it) {
+        delete *it;
+        *it = NULL;
+    }
+
+    mPlugins.clear();
+}
+
+OMX_ERRORTYPE OMXMaster::makeComponentInstance(
+        const char *name,
+        const OMX_CALLBACKTYPE *callbacks,
+        OMX_PTR appData,
+        OMX_COMPONENTTYPE **component) {
+    Mutex::Autolock autoLock(mLock);
+
+    *component = NULL;
+
+    ssize_t index = mPluginByComponentName.indexOfKey(String8(name));
+
+    if (index < 0) {
+        return OMX_ErrorInvalidComponentName;
+    }
+
+    OMXPluginBase *plugin = mPluginByComponentName.valueAt(index);
+    return plugin->makeComponentInstance(name, callbacks, appData, component);
+}
+
+OMX_ERRORTYPE OMXMaster::enumerateComponents(
+        OMX_STRING name,
+        size_t size,
+        OMX_U32 index) {
+    Mutex::Autolock autoLock(mLock);
+
+    size_t numComponents = mPluginByComponentName.size();
+
+    if (index >= numComponents) {
+        return OMX_ErrorNoMore;
+    }
+
+    const String8 &name8 = mPluginByComponentName.keyAt(index);
+
+    CHECK(size >= 1 + name8.size());
+    strcpy(name, name8.string());
+
+    return OMX_ErrorNone;
+}
+
+}  // namespace android