1 files changed, 154 insertions, 0 deletions
diff --git a/media/libstagefright/filters/GraphicBufferListener.cpp b/media/libstagefright/filters/GraphicBufferListener.cpp
new file mode 100644
index 0000000..e493137
--- /dev/null
+++ b/media/libstagefright/filters/GraphicBufferListener.cpp
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2014 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 "GraphicBufferListener"
+
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/foundation/AMessage.h>
+#include <media/stagefright/MediaErrors.h>
+
+#include "GraphicBufferListener.h"
+
+namespace android {
+
+status_t GraphicBufferListener::init(
+        const sp<AMessage> &notify,
+        size_t bufferWidth, size_t bufferHeight, size_t bufferCount) {
+    mNotify = notify;
+
+    String8 name("GraphicBufferListener");
+    BufferQueue::createBufferQueue(&mProducer, &mConsumer);
+    mConsumer->setConsumerName(name);
+    mConsumer->setDefaultBufferSize(bufferWidth, bufferHeight);
+    mConsumer->setConsumerUsageBits(GRALLOC_USAGE_SW_READ_OFTEN);
+
+    status_t err = mConsumer->setMaxAcquiredBufferCount(bufferCount);
+    if (err != NO_ERROR) {
+        ALOGE("Unable to set BQ max acquired buffer count to %u: %d",
+                bufferCount, err);
+        return err;
+    }
+
+    wp<BufferQueue::ConsumerListener> listener =
+        static_cast<BufferQueue::ConsumerListener*>(this);
+    sp<BufferQueue::ProxyConsumerListener> proxy =
+        new BufferQueue::ProxyConsumerListener(listener);
+
+    err = mConsumer->consumerConnect(proxy, false);
+    if (err != NO_ERROR) {
+        ALOGE("Error connecting to BufferQueue: %s (%d)",
+                strerror(-err), err);
+        return err;
+    }
+
+    ALOGV("init() successful.");
+
+    return OK;
+}
+
+void GraphicBufferListener::onFrameAvailable() {
+    ALOGV("onFrameAvailable() called");
+
+    {
+        Mutex::Autolock autoLock(mMutex);
+        mNumFramesAvailable++;
+    }
+
+    sp<AMessage> notify = mNotify->dup();
+    mNotify->setWhat(kWhatFrameAvailable);
+    mNotify->post();
+}
+
+void GraphicBufferListener::onBuffersReleased() {
+    ALOGV("onBuffersReleased() called");
+    // nothing to do
+}
+
+void GraphicBufferListener::onSidebandStreamChanged() {
+    ALOGW("GraphicBufferListener cannot consume sideband streams.");
+    // nothing to do
+}
+
+BufferQueue::BufferItem GraphicBufferListener::getBufferItem() {
+    BufferQueue::BufferItem item;
+
+    {
+        Mutex::Autolock autoLock(mMutex);
+        if (mNumFramesAvailable <= 0) {
+            ALOGE("getBuffer() called with no frames available");
+            return item;
+        }
+        mNumFramesAvailable--;
+    }
+
+    status_t err = mConsumer->acquireBuffer(&item, 0);
+    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
+        // shouldn't happen, since we track num frames available
+        ALOGE("frame was not available");
+        item.mBuf = -1;
+        return item;
+    } else if (err != OK) {
+        ALOGE("acquireBuffer returned err=%d", err);
+        item.mBuf = -1;
+        return item;
+    }
+
+    // Wait for it to become available.
+    err = item.mFence->waitForever("GraphicBufferListener::getBufferItem");
+    if (err != OK) {
+        ALOGW("failed to wait for buffer fence: %d", err);
+        // keep going
+    }
+
+    // If this is the first time we're seeing this buffer, add it to our
+    // slot table.
+    if (item.mGraphicBuffer != NULL) {
+        ALOGV("setting mBufferSlot %d", item.mBuf);
+        mBufferSlot[item.mBuf] = item.mGraphicBuffer;
+    }
+
+    return item;
+}
+
+sp<GraphicBuffer> GraphicBufferListener::getBuffer(
+        BufferQueue::BufferItem item) {
+    sp<GraphicBuffer> buf;
+    if (item.mBuf < 0 || item.mBuf >= BufferQueue::NUM_BUFFER_SLOTS) {
+        ALOGE("getBuffer() received invalid BufferItem: mBuf==%d", item.mBuf);
+        return buf;
+    }
+
+    buf = mBufferSlot[item.mBuf];
+    CHECK(buf.get() != NULL);
+
+    return buf;
+}
+
+status_t GraphicBufferListener::releaseBuffer(
+        BufferQueue::BufferItem item) {
+    if (item.mBuf < 0 || item.mBuf >= BufferQueue::NUM_BUFFER_SLOTS) {
+        ALOGE("getBuffer() received invalid BufferItem: mBuf==%d", item.mBuf);
+        return ERROR_OUT_OF_RANGE;
+    }
+
+    mConsumer->releaseBuffer(item.mBuf, item.mFrameNumber,
+            EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE);
+
+    return OK;
+}
+
+}   // namespace android