1 files changed, 86 insertions, 0 deletions
diff --git a/media/libstagefright/MediaBufferGroup.cpp b/media/libstagefright/MediaBufferGroup.cpp
new file mode 100644
index 0000000..80aae51
--- /dev/null
+++ b/media/libstagefright/MediaBufferGroup.cpp
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "MediaBufferGroup"
+#include <utils/Log.h>
+
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/MediaBuffer.h>
+#include <media/stagefright/MediaBufferGroup.h>
+
+namespace android {
+
+MediaBufferGroup::MediaBufferGroup()
+    : mFirstBuffer(NULL),
+      mLastBuffer(NULL) {
+}
+
+MediaBufferGroup::~MediaBufferGroup() {
+    MediaBuffer *next;
+    for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL;
+         buffer = next) {
+        next = buffer->nextBuffer();
+
+        CHECK_EQ(buffer->refcount(), 0);
+
+        buffer->setObserver(NULL);
+        buffer->release();
+    }
+}
+
+void MediaBufferGroup::add_buffer(MediaBuffer *buffer) {
+    Mutex::Autolock autoLock(mLock);
+
+    buffer->setObserver(this);
+
+    if (mLastBuffer) {
+        mLastBuffer->setNextBuffer(buffer);
+    } else {
+        mFirstBuffer = buffer;
+    }
+
+    mLastBuffer = buffer;
+}
+
+status_t MediaBufferGroup::acquire_buffer(MediaBuffer **out) {
+    Mutex::Autolock autoLock(mLock);
+
+    for (;;) {
+        for (MediaBuffer *buffer = mFirstBuffer;
+             buffer != NULL; buffer = buffer->nextBuffer()) {
+            if (buffer->refcount() == 0) {
+                buffer->add_ref();
+                buffer->reset();
+
+                *out = buffer;
+                goto exit;
+            }
+        }
+
+        // All buffers are in use. Block until one of them is returned to us.
+        mCondition.wait(mLock);
+    }
+
+exit:
+    return OK;
+}
+
+void MediaBufferGroup::signalBufferReturned(MediaBuffer *) {
+    Mutex::Autolock autoLock(mLock);
+    mCondition.signal();
+}
+
+}  // namespace android