Camera: Add streams to camera3 HAL device

- Generic stream interface
- Functional output stream
- Skeleton input/zsl stream

Change-Id: I143794eac1a2217031d62b51912662fc6d1db900

9 files changed, 1363 insertions, 0 deletions

diff --git a/services/camera/libcameraservice/Android.mk b/services/camera/libcameraservice/Android.mk
index 8600735..6847bf8 100644
--- a/services/camera/libcameraservice/Android.mk
+++ b/services/camera/libcameraservice/Android.mk
@@ -25,6 +25,10 @@ LOCAL_SRC_FILES:=               \
     camera2/JpegCompressor.cpp \
     camera2/CaptureSequencer.cpp \
     camera2/ProFrameProcessor.cpp \
+    camera3/Camera3Stream.cpp \
+    camera3/Camera3InputStream.cpp \
+    camera3/Camera3OutputStream.cpp \
+    camera3/Camera3ZslStream.cpp
 
 LOCAL_SHARED_LIBRARIES:= \
     libui \
diff --git a/services/camera/libcameraservice/camera3/Camera3InputStream.cpp b/services/camera/libcameraservice/camera3/Camera3InputStream.cpp
new file mode 100644
index 0000000..8a48ee5
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3InputStream.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2013 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 "Camera3-InputStream"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include <utils/Trace.h>
+#include "Camera3InputStream.h"
+
+namespace android {
+
+namespace camera3 {
+
+Camera3InputStream::Camera3InputStream(int id,
+        uint32_t width, uint32_t height, int format) :
+        Camera3Stream(id, CAMERA3_STREAM_INPUT, width, height, 0, format) {
+}
+
+status_t Camera3InputStream::getBufferLocked(camera3_stream_buffer *buffer) {
+    (void) buffer;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3InputStream::returnBufferLocked(
+        const camera3_stream_buffer &buffer,
+        nsecs_t timestamp) {
+    (void) timestamp;
+    (void) buffer;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+bool Camera3InputStream::hasOutstandingBuffersLocked() const {
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return false;
+}
+
+status_t Camera3InputStream::waitUntilIdle(nsecs_t timeout) {
+    (void) timeout;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3InputStream::disconnectLocked() {
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+sp<IGraphicBufferProducer> Camera3InputStream::getProducerInterface() const {
+    return mConsumer->getProducerInterface();
+}
+
+void Camera3InputStream::dump(int fd, const Vector<String16> &args) const {
+    (void) fd;
+    (void) args;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+}
+
+}; // namespace camera3
+
+}; // namespace android
diff --git a/services/camera/libcameraservice/camera3/Camera3InputStream.h b/services/camera/libcameraservice/camera3/Camera3InputStream.h
new file mode 100644
index 0000000..c4b5dd9
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3InputStream.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA3_INPUT_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_INPUT_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+#include <gui/BufferItemConsumer.h>
+
+#include "Camera3Stream.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single stream of input data to the camera device.
+ */
+class Camera3InputStream : public Camera3Stream {
+  public:
+    /**
+     * Set up a stream for formats that have fixed size, such as RAW and YUV.
+     */
+    Camera3InputStream(int id, uint32_t width, uint32_t height, int format);
+
+    virtual status_t waitUntilIdle(nsecs_t timeout);
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    /**
+     * Get the producer interface for this stream, to hand off to a producer.
+     * The producer must be connected to the provided interface before
+     * finishConfigure is called on this stream.
+     */
+    sp<IGraphicBufferProducer> getProducerInterface() const;
+
+  private:
+
+    sp<BufferItemConsumer> mConsumer;
+
+    /**
+     * Camera3Stream interface
+     */
+
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnBufferLocked(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+    virtual bool     hasOutstandingBuffersLocked() const;
+    virtual status_t disconnectLocked();
+
+}; // class Camera3InputStream
+
+}; // namespace camera3
+
+}; // namespace android
+
+#endif
diff --git a/services/camera/libcameraservice/camera3/Camera3OutputStream.cpp b/services/camera/libcameraservice/camera3/Camera3OutputStream.cpp
new file mode 100644
index 0000000..d07ae94
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3OutputStream.cpp
@@ -0,0 +1,437 @@
+/*
+ * Copyright (C) 2013 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 "Camera3-OutputStream"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+// This is needed for stdint.h to define INT64_MAX in C++
+#define __STDC_LIMIT_MACROS
+
+#include <utils/Log.h>
+#include <utils/Trace.h>
+#include "Camera3OutputStream.h"
+
+#ifndef container_of
+#define container_of(ptr, type, member) \
+    (type *)((char*)(ptr) - offsetof(type, member))
+#endif
+
+namespace android {
+
+namespace camera3 {
+
+Camera3OutputStream::Camera3OutputStream(int id,
+        sp<ANativeWindow> consumer,
+        uint32_t width, uint32_t height, int format) :
+        Camera3Stream(id, CAMERA3_STREAM_OUTPUT, width, height, 0, format),
+        mConsumer(consumer),
+        mTransform(0),
+        mTotalBufferCount(0),
+        mDequeuedBufferCount(0),
+        mFrameCount(0),
+        mLastTimestamp(0) {
+
+    mCombinedFence = new Fence();
+    if (mConsumer == NULL) {
+        ALOGE("%s: Consumer is NULL!", __FUNCTION__);
+        mState = STATE_ERROR;
+    }
+}
+
+Camera3OutputStream::Camera3OutputStream(int id,
+        sp<ANativeWindow> consumer,
+        uint32_t width, uint32_t height, size_t maxSize, int format) :
+        Camera3Stream(id, CAMERA3_STREAM_OUTPUT,
+                width, height, maxSize, format),
+        mConsumer(consumer) {
+
+    if (format != HAL_PIXEL_FORMAT_BLOB) {
+        ALOGE("%s: Bad format for size-only stream: %d", __FUNCTION__,
+                format);
+        mState = STATE_ERROR;
+    }
+
+    if (mConsumer == NULL) {
+        ALOGE("%s: Consumer is NULL!", __FUNCTION__);
+        mState = STATE_ERROR;
+    }
+}
+
+Camera3OutputStream::~Camera3OutputStream() {
+    disconnectLocked();
+}
+
+status_t Camera3OutputStream::getBufferLocked(camera3_stream_buffer *buffer) {
+    ATRACE_CALL();
+    status_t res;
+
+    // Allow dequeue during IN_[RE]CONFIG for registration
+    if (mState != STATE_CONFIGURED &&
+            mState != STATE_IN_CONFIG && mState != STATE_IN_RECONFIG) {
+        ALOGE("%s: Stream %d: Can't get buffers in unconfigured state %d",
+                __FUNCTION__, mId, mState);
+        return INVALID_OPERATION;
+    }
+
+    // Only limit dequeue amount when fully configured
+    if (mState == STATE_CONFIGURED &&
+            mDequeuedBufferCount == camera3_stream::max_buffers) {
+        ALOGE("%s: Stream %d: Already dequeued maximum number of simultaneous"
+                " buffers (%d)", __FUNCTION__, mId,
+                camera3_stream::max_buffers);
+        return INVALID_OPERATION;
+    }
+
+    ANativeWindowBuffer* anb;
+    int fenceFd;
+
+    res = mConsumer->dequeueBuffer(mConsumer.get(), &anb, &fenceFd);
+    if (res != OK) {
+        ALOGE("%s: Stream %d: Can't dequeue next output buffer: %s (%d)",
+                __FUNCTION__, mId, strerror(-res), res);
+        return res;
+    }
+
+    // Handing out a raw pointer to this object. Increment internal refcount.
+    incStrong(this);
+    buffer->stream = this;
+    buffer->buffer = &(anb->handle);
+    buffer->acquire_fence = fenceFd;
+    buffer->release_fence = -1;
+    buffer->status = CAMERA3_BUFFER_STATUS_OK;
+
+    mDequeuedBufferCount++;
+
+    return OK;
+}
+
+status_t Camera3OutputStream::returnBufferLocked(
+        const camera3_stream_buffer &buffer,
+        nsecs_t timestamp) {
+    ATRACE_CALL();
+    status_t res;
+
+    // returnBuffer may be called from a raw pointer, not a sp<>, and we'll be
+    // decrementing the internal refcount next. In case this is the last ref, we
+    // might get destructed on the decStrong(), so keep an sp around until the
+    // end of the call - otherwise have to sprinkle the decStrong on all exit
+    // points.
+    sp<Camera3OutputStream> keepAlive(this);
+    decStrong(this);
+
+    // Allow buffers to be returned in the error state, to allow for disconnect
+    // and in the in-config states for registration
+    if (mState == STATE_CONSTRUCTED) {
+        ALOGE("%s: Stream %d: Can't return buffers in unconfigured state %d",
+                __FUNCTION__, mId, mState);
+        return INVALID_OPERATION;
+    }
+    if (mDequeuedBufferCount == 0) {
+        ALOGE("%s: Stream %d: No buffers outstanding to return", __FUNCTION__,
+                mId);
+        return INVALID_OPERATION;
+    }
+    if (buffer.status == CAMERA3_BUFFER_STATUS_ERROR) {
+        res = mConsumer->cancelBuffer(mConsumer.get(),
+                container_of(buffer.buffer, ANativeWindowBuffer, handle),
+                buffer.release_fence);
+        if (res != OK) {
+            ALOGE("%s: Stream %d: Error cancelling buffer to native window:"
+                    " %s (%d)", __FUNCTION__, mId, strerror(-res), res);
+            return res;
+        }
+    } else {
+        res = native_window_set_buffers_timestamp(mConsumer.get(), timestamp);
+        if (res != OK) {
+            ALOGE("%s: Stream %d: Error setting timestamp: %s (%d)",
+                    __FUNCTION__, mId, strerror(-res), res);
+            return res;
+        }
+
+        sp<Fence> releaseFence = new Fence(buffer.release_fence);
+        int anwReleaseFence = releaseFence->dup();
+
+        res = mConsumer->queueBuffer(mConsumer.get(),
+                container_of(buffer.buffer, ANativeWindowBuffer, handle),
+                anwReleaseFence);
+        if (res != OK) {
+            ALOGE("%s: Stream %d: Error queueing buffer to native window: %s (%d)",
+                    __FUNCTION__, mId, strerror(-res), res);
+            close(anwReleaseFence);
+            return res;
+        }
+
+        mCombinedFence = Fence::merge(mName, mCombinedFence, releaseFence);
+    }
+
+    mDequeuedBufferCount--;
+    mBufferReturnedSignal.signal();
+    mLastTimestamp = timestamp;
+
+    return OK;
+}
+
+bool Camera3OutputStream::hasOutstandingBuffersLocked() const {
+    nsecs_t signalTime = mCombinedFence->getSignalTime();
+    ALOGV("%s: Stream %d: Has %d outstanding buffers,"
+            " buffer signal time is %lld",
+            __FUNCTION__, mId, mDequeuedBufferCount, signalTime);
+    if (mDequeuedBufferCount > 0 || signalTime == INT64_MAX) {
+        return true;
+    }
+    return false;
+}
+
+status_t Camera3OutputStream::waitUntilIdle(nsecs_t timeout) {
+    status_t res;
+    {
+        Mutex::Autolock l(mLock);
+        while (mDequeuedBufferCount > 0) {
+            if (timeout != TIMEOUT_NEVER) {
+                nsecs_t startTime = systemTime();
+                res = mBufferReturnedSignal.waitRelative(mLock, timeout);
+                if (res == TIMED_OUT) {
+                    return res;
+                } else if (res != OK) {
+                    ALOGE("%s: Error waiting for outstanding buffers: %s (%d)",
+                            __FUNCTION__, strerror(-res), res);
+                    return res;
+                }
+                nsecs_t deltaTime = systemTime() - startTime;
+                if (timeout <= deltaTime) {
+                    timeout = 0;
+                } else {
+                    timeout -= deltaTime;
+                }
+            } else {
+                res = mBufferReturnedSignal.wait(mLock);
+                if (res != OK) {
+                    ALOGE("%s: Error waiting for outstanding buffers: %s (%d)",
+                            __FUNCTION__, strerror(-res), res);
+                    return res;
+                }
+            }
+        }
+    }
+
+    // No lock
+
+    unsigned int timeoutMs;
+    if (timeout == TIMEOUT_NEVER) {
+        timeoutMs = Fence::TIMEOUT_NEVER;
+    } else if (timeout == 0) {
+        timeoutMs = 0;
+    } else {
+        // Round up to wait at least 1 ms
+        timeoutMs = (timeout + 999999) / 1000000;
+    }
+
+    return mCombinedFence->wait(timeoutMs);
+}
+
+void Camera3OutputStream::dump(int fd, const Vector<String16> &args) const {
+    (void) args;
+    String8 lines;
+    lines.appendFormat("    Stream[%d]: Output\n", mId);
+    lines.appendFormat("      State: %d\n", mState);
+    lines.appendFormat("      Dims: %d x %d, format 0x%x\n",
+            camera3_stream::width, camera3_stream::height,
+            camera3_stream::format);
+    lines.appendFormat("      Max size: %d\n", mMaxSize);
+    lines.appendFormat("      Usage: %d, max HAL buffers: %d\n",
+            camera3_stream::usage, camera3_stream::max_buffers);
+    lines.appendFormat("      Frames produced: %d, last timestamp: %lld ns\n",
+            mFrameCount, mLastTimestamp);
+    lines.appendFormat("      Total buffers: %d, currently dequeued: %d\n",
+            mTotalBufferCount, mDequeuedBufferCount);
+    write(fd, lines.string(), lines.size());
+}
+
+status_t Camera3OutputStream::setTransform(int transform) {
+    ATRACE_CALL();
+    Mutex::Autolock l(mLock);
+    return setTransformLocked(transform);
+}
+
+status_t Camera3OutputStream::setTransformLocked(int transform) {
+    status_t res = OK;
+    if (mState == STATE_ERROR) {
+        ALOGE("%s: Stream in error state", __FUNCTION__);
+        return INVALID_OPERATION;
+    }
+
+    mTransform = transform;
+    if (mState == STATE_CONFIGURED) {
+        res = native_window_set_buffers_transform(mConsumer.get(),
+                transform);
+        if (res != OK) {
+            ALOGE("%s: Unable to configure stream transform to %x: %s (%d)",
+                    __FUNCTION__, transform, strerror(-res), res);
+        }
+    }
+    return res;
+}
+
+status_t Camera3OutputStream::configureQueueLocked() {
+    status_t res;
+
+    switch (mState) {
+        case STATE_IN_RECONFIG:
+            res = disconnect();
+            if (res != OK) {
+                return res;
+            }
+            break;
+        case STATE_IN_CONFIG:
+            // OK
+            break;
+        default:
+            ALOGE("%s: Bad state: %d", __FUNCTION__, mState);
+            return INVALID_OPERATION;
+    }
+
+    // Configure consumer-side ANativeWindow interface
+    res = native_window_api_connect(mConsumer.get(),
+            NATIVE_WINDOW_API_CAMERA);
+    if (res != OK) {
+        ALOGE("%s: Unable to connect to native window for stream %d",
+                __FUNCTION__, mId);
+        return res;
+    }
+
+    res = native_window_set_usage(mConsumer.get(), camera3_stream::usage);
+    if (res != OK) {
+        ALOGE("%s: Unable to configure usage %08x for stream %d",
+                __FUNCTION__, camera3_stream::usage, mId);
+        return res;
+    }
+
+    res = native_window_set_scaling_mode(mConsumer.get(),
+            NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
+    if (res != OK) {
+        ALOGE("%s: Unable to configure stream scaling: %s (%d)",
+                __FUNCTION__, strerror(-res), res);
+        return res;
+    }
+
+    res = setTransformLocked(0);
+    if (res != OK) {
+        return res;
+    }
+
+    if (mMaxSize == 0) {
+        // For buffers of known size
+        res = native_window_set_buffers_geometry(mConsumer.get(),
+                camera3_stream::width, camera3_stream::height,
+                camera3_stream::format);
+    } else {
+        // For buffers with bounded size
+        res = native_window_set_buffers_geometry(mConsumer.get(),
+                mMaxSize, 1,
+                camera3_stream::format);
+    }
+    if (res != OK) {
+        ALOGE("%s: Unable to configure stream buffer geometry"
+                " %d x %d, format %x for stream %d",
+                __FUNCTION__, camera3_stream::width, camera3_stream::height,
+                camera3_stream::format, mId);
+        return res;
+    }
+
+    int maxConsumerBuffers;
+    res = mConsumer->query(mConsumer.get(),
+            NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS, &maxConsumerBuffers);
+    if (res != OK) {
+        ALOGE("%s: Unable to query consumer undequeued"
+                " buffer count for stream %d", __FUNCTION__, mId);
+        return res;
+    }
+
+    ALOGV("%s: Consumer wants %d buffers", __FUNCTION__,
+            maxConsumerBuffers);
+
+    mTotalBufferCount = maxConsumerBuffers + camera3_stream::max_buffers;
+    mDequeuedBufferCount = 0;
+    mFrameCount = 0;
+    mLastTimestamp = 0;
+
+    res = native_window_set_buffer_count(mConsumer.get(),
+            mTotalBufferCount);
+    if (res != OK) {
+        ALOGE("%s: Unable to set buffer count for stream %d",
+                __FUNCTION__, mId);
+        return res;
+    }
+
+    res = native_window_set_buffers_transform(mConsumer.get(),
+            mTransform);
+    if (res != OK) {
+        ALOGE("%s: Unable to configure stream transform to %x: %s (%d)",
+                __FUNCTION__, mTransform, strerror(-res), res);
+    }
+
+    return OK;
+}
+
+size_t Camera3OutputStream::getBufferCountLocked() {
+    return mTotalBufferCount;
+}
+
+status_t Camera3OutputStream::disconnectLocked() {
+    status_t res;
+
+    switch (mState) {
+        case STATE_IN_RECONFIG:
+        case STATE_CONFIGURED:
+            // OK
+            break;
+        default:
+            // No connection, nothing to do
+            return OK;
+    }
+
+    if (mDequeuedBufferCount > 0) {
+        ALOGE("%s: Can't disconnect with %d buffers still dequeued!",
+                __FUNCTION__, mDequeuedBufferCount);
+        return INVALID_OPERATION;
+    }
+
+    res = native_window_api_disconnect(mConsumer.get(), NATIVE_WINDOW_API_CAMERA);
+
+    /**
+     * This is not an error. if client calling process dies, the window will
+     * also die and all calls to it will return DEAD_OBJECT, thus it's already
+     * "disconnected"
+     */
+    if (res == DEAD_OBJECT) {
+        ALOGW("%s: While disconnecting stream %d from native window, the"
+                " native window died from under us", __FUNCTION__, mId);
+    }
+    else if (res != OK) {
+        ALOGE("%s: Unable to disconnect stream %d from native window (error %d %s)",
+                __FUNCTION__, mId, res, strerror(-res));
+        mState = STATE_ERROR;
+        return res;
+    }
+
+    mState = (mState == STATE_IN_RECONFIG) ? STATE_IN_CONFIG : STATE_CONSTRUCTED;
+    return OK;
+}
+
+}; // namespace camera3
+
+}; // namespace android
diff --git a/services/camera/libcameraservice/camera3/Camera3OutputStream.h b/services/camera/libcameraservice/camera3/Camera3OutputStream.h
new file mode 100644
index 0000000..d331a94
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3OutputStream.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA3_OUTPUT_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_OUTPUT_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+
+#include "Camera3Stream.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single stream of output data from the camera device.
+ */
+class Camera3OutputStream : public Camera3Stream {
+  public:
+    /**
+     * Set up a stream for formats that have 2 dimensions, such as RAW and YUV.
+     */
+    Camera3OutputStream(int id, sp<ANativeWindow> consumer,
+            uint32_t width, uint32_t height, int format);
+
+    /**
+     * Set up a stream for formats that have a variable buffer size for the same
+     * dimensions, such as compressed JPEG.
+     */
+    Camera3OutputStream(int id, sp<ANativeWindow> consumer,
+            uint32_t width, uint32_t height, size_t maxSize, int format);
+
+    virtual ~Camera3OutputStream();
+
+    /**
+     * Camera3Stream interface
+     */
+
+    virtual status_t waitUntilIdle(nsecs_t timeout);
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    /**
+     * Set the transform on the output stream; one of the
+     * HAL_TRANSFORM_* / NATIVE_WINDOW_TRANSFORM_* constants.
+     */
+    status_t         setTransform(int transform);
+
+  private:
+    sp<ANativeWindow> mConsumer;
+    int               mTransform;
+    size_t            mTotalBufferCount;
+    size_t            mDequeuedBufferCount;
+    Condition         mBufferReturnedSignal;
+    uint32_t          mFrameCount;
+    nsecs_t           mLastTimestamp;
+
+    // The merged release fence for all returned buffers
+    sp<Fence>         mCombinedFence;
+
+    status_t         setTransformLocked(int transform);
+
+    /**
+     * Internal Camera3Stream interface
+     */
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnBufferLocked(
+            const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+    virtual bool     hasOutstandingBuffersLocked() const;
+
+    virtual status_t configureQueueLocked();
+    virtual size_t   getBufferCountLocked();
+    virtual status_t disconnectLocked();
+
+}; // class Camera3OutputStream
+
+} // namespace camera3
+
+} // namespace android
+
+#endif
diff --git a/services/camera/libcameraservice/camera3/Camera3Stream.cpp b/services/camera/libcameraservice/camera3/Camera3Stream.cpp
new file mode 100644
index 0000000..cf3072b
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3Stream.cpp
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2013 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 "Camera3-Stream"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include <utils/Trace.h>
+#include "Camera3Stream.h"
+
+namespace android {
+
+namespace camera3 {
+
+Camera3Stream::~Camera3Stream() {
+}
+
+Camera3Stream* Camera3Stream::cast(camera3_stream *stream) {
+    return static_cast<Camera3Stream*>(stream);
+}
+
+const Camera3Stream* Camera3Stream::cast(const camera3_stream *stream) {
+    return static_cast<const Camera3Stream*>(stream);
+}
+
+Camera3Stream::Camera3Stream(int id,
+        camera3_stream_type type,
+        uint32_t width, uint32_t height, size_t maxSize, int format) :
+    camera3_stream(),
+    mId(id),
+    mName(String8::format("Camera3Stream[%d]", id)),
+    mMaxSize(maxSize),
+    mState(STATE_CONSTRUCTED) {
+
+    camera3_stream::stream_type = type;
+    camera3_stream::width = width;
+    camera3_stream::height = height;
+    camera3_stream::format = format;
+    camera3_stream::usage = 0;
+    camera3_stream::max_buffers = 0;
+    camera3_stream::priv = NULL;
+
+    if (format == HAL_PIXEL_FORMAT_BLOB && maxSize == 0) {
+        ALOGE("%s: BLOB format with size == 0", __FUNCTION__);
+        mState = STATE_ERROR;
+    }
+}
+
+int Camera3Stream::getId() const {
+    return mId;
+}
+
+uint32_t Camera3Stream::getWidth() const {
+    return camera3_stream::width;
+}
+
+uint32_t Camera3Stream::getHeight() const {
+    return camera3_stream::height;
+}
+
+int Camera3Stream::getFormat() const {
+    return camera3_stream::format;
+}
+
+camera3_stream* Camera3Stream::startConfiguration() {
+    Mutex::Autolock l(mLock);
+
+    switch (mState) {
+        case STATE_ERROR:
+            ALOGE("%s: In error state", __FUNCTION__);
+            return NULL;
+        case STATE_CONSTRUCTED:
+            // OK
+            break;
+        case STATE_IN_CONFIG:
+        case STATE_IN_RECONFIG:
+            // Can start config again with no trouble; but don't redo
+            // oldUsage/oldMaxBuffers
+            return this;
+        case STATE_CONFIGURED:
+            if (stream_type == CAMERA3_STREAM_INPUT) {
+                ALOGE("%s: Cannot configure an input stream twice",
+                        __FUNCTION__);
+                return NULL;
+            } else if (hasOutstandingBuffersLocked()) {
+                ALOGE("%s: Cannot configure stream; has outstanding buffers",
+                        __FUNCTION__);
+                return NULL;
+            }
+            break;
+        default:
+            ALOGE("%s: Unknown state %d", __FUNCTION__, mState);
+            return NULL;
+    }
+
+    oldUsage = usage;
+    oldMaxBuffers = max_buffers;
+
+    if (mState == STATE_CONSTRUCTED) {
+        mState = STATE_IN_CONFIG;
+    } else { // mState == STATE_CONFIGURED
+        mState = STATE_IN_RECONFIG;
+    }
+
+    return this;
+}
+
+bool Camera3Stream::isConfiguring() const {
+    Mutex::Autolock l(mLock);
+    return (mState == STATE_IN_CONFIG) || (mState == STATE_IN_RECONFIG);
+}
+
+status_t Camera3Stream::finishConfiguration(camera3_device *hal3Device) {
+    Mutex::Autolock l(mLock);
+    switch (mState) {
+        case STATE_ERROR:
+            ALOGE("%s: In error state", __FUNCTION__);
+            return INVALID_OPERATION;
+        case STATE_IN_CONFIG:
+        case STATE_IN_RECONFIG:
+            // OK
+            break;
+        case STATE_CONSTRUCTED:
+        case STATE_CONFIGURED:
+            ALOGE("%s: Cannot finish configuration that hasn't been started",
+                    __FUNCTION__);
+            return INVALID_OPERATION;
+        default:
+            ALOGE("%s: Unknown state", __FUNCTION__);
+            return INVALID_OPERATION;
+    }
+
+    // Check if the stream configuration is unchanged, and skip reallocation if
+    // so. As documented in hardware/camera3.h:configure_streams().
+    if (mState == STATE_IN_RECONFIG &&
+            oldUsage == usage &&
+            oldMaxBuffers == max_buffers) {
+        mState = STATE_CONFIGURED;
+        return OK;
+    }
+
+    status_t res;
+    res = configureQueueLocked();
+    if (res != OK) {
+        ALOGE("%s: Unable to configure stream %d queue: %s (%d)",
+                __FUNCTION__, mId, strerror(-res), res);
+        mState = STATE_ERROR;
+        return res;
+    }
+
+    res = registerBuffersLocked(hal3Device);
+    if (res != OK) {
+        ALOGE("%s: Unable to register stream buffers with HAL: %s (%d)",
+                __FUNCTION__, strerror(-res), res);
+        mState = STATE_ERROR;
+        return res;
+    }
+
+    mState = STATE_CONFIGURED;
+
+    return res;
+}
+
+status_t Camera3Stream::getBuffer(camera3_stream_buffer *buffer) {
+    ATRACE_CALL();
+    Mutex::Autolock l(mLock);
+    return getBufferLocked(buffer);
+}
+
+status_t Camera3Stream::returnBuffer(const camera3_stream_buffer &buffer,
+        nsecs_t timestamp) {
+    ATRACE_CALL();
+    Mutex::Autolock l(mLock);
+    return returnBufferLocked(buffer, timestamp);
+}
+
+bool Camera3Stream::hasOutstandingBuffers() const {
+    ATRACE_CALL();
+    Mutex::Autolock l(mLock);
+    return hasOutstandingBuffersLocked();
+}
+
+status_t Camera3Stream::disconnect() {
+    ATRACE_CALL();
+    Mutex::Autolock l(mLock);
+    return disconnectLocked();
+}
+
+status_t Camera3Stream::registerBuffersLocked(camera3_device *hal3Device) {
+    ATRACE_CALL();
+    status_t res;
+
+    size_t bufferCount = getBufferCountLocked();
+
+    Vector<buffer_handle_t*> buffers;
+    buffers.insertAt(NULL, 0, bufferCount);
+
+    camera3_stream_buffer_set bufferSet = camera3_stream_buffer_set();
+    bufferSet.stream = this;
+    bufferSet.num_buffers = bufferCount;
+    bufferSet.buffers = buffers.editArray();
+
+    Vector<camera3_stream_buffer_t> streamBuffers;
+    streamBuffers.insertAt(camera3_stream_buffer_t(), 0, bufferCount);
+
+    // Register all buffers with the HAL. This means getting all the buffers
+    // from the stream, providing them to the HAL with the
+    // register_stream_buffers() method, and then returning them back to the
+    // stream in the error state, since they won't have valid data.
+    //
+    // Only registered buffers can be sent to the HAL.
+
+    uint32_t bufferIdx = 0;
+    for (; bufferIdx < bufferCount; bufferIdx++) {
+        res = getBufferLocked( &streamBuffers.editItemAt(bufferIdx) );
+        if (res != OK) {
+            ALOGE("%s: Unable to get buffer %d for registration with HAL",
+                    __FUNCTION__, bufferIdx);
+            // Skip registering, go straight to cleanup
+            break;
+        }
+
+        sp<Fence> fence = new Fence(streamBuffers[bufferIdx].acquire_fence);
+        fence->waitForever(kRegisterFenceTimeoutMs,
+                "Camera3Stream::registerBuffers");
+
+        buffers.editItemAt(bufferIdx) = streamBuffers[bufferIdx].buffer;
+    }
+    if (bufferIdx == bufferCount) {
+        // Got all buffers, register with HAL
+        ALOGV("%s: Registering %d buffers with camera HAL",
+                __FUNCTION__, bufferCount);
+        res = hal3Device->ops->register_stream_buffers(hal3Device,
+                &bufferSet);
+    }
+
+    // Return all valid buffers to stream, in ERROR state to indicate
+    // they weren't filled.
+    for (size_t i = 0; i < bufferIdx; i++) {
+        streamBuffers.editItemAt(i).release_fence = -1;
+        streamBuffers.editItemAt(i).status = CAMERA3_BUFFER_STATUS_ERROR;
+        returnBufferLocked(streamBuffers[i], 0);
+    }
+
+    return res;
+}
+
+}; // namespace camera3
+
+}; // namespace android
diff --git a/services/camera/libcameraservice/camera3/Camera3Stream.h b/services/camera/libcameraservice/camera3/Camera3Stream.h
new file mode 100644
index 0000000..2364cfd
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3Stream.h
@@ -0,0 +1,248 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA3_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_STREAM_H
+
+#include <gui/Surface.h>
+#include <utils/RefBase.h>
+#include <utils/String8.h>
+#include <utils/String16.h>
+
+#include "hardware/camera3.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single stream of input or output data from the camera
+ * device.
+ *
+ * The stream has an internal state machine to track whether it's
+ * connected/configured/etc.
+ *
+ * States:
+ *
+ *  STATE_ERROR: A serious error has occurred, stream is unusable. Outstanding
+ *    buffers may still be returned.
+ *
+ *  STATE_CONSTRUCTED: The stream is ready for configuration, but buffers cannot
+ *    be gotten yet. Not connected to any endpoint, no buffers are registered
+ *    with the HAL.
+ *
+ *  STATE_IN_CONFIG: Configuration has started, but not yet concluded. During this
+ *    time, the usage, max_buffers, and priv fields of camera3_stream returned by
+ *    startConfiguration() may be modified.
+ *
+ *  STATE_IN_RE_CONFIG: Configuration has started, and the stream has been
+ *    configured before. Need to track separately from IN_CONFIG to avoid
+ *    re-registering buffers with HAL.
+ *
+ *  STATE_CONFIGURED: Stream is configured, and has registered buffers with the
+ *    HAL. The stream's getBuffer/returnBuffer work. The priv pointer may still be
+ *    modified.
+ *
+ * Transition table:
+ *
+ *    <none>               => STATE_CONSTRUCTED:
+ *        When constructed with valid arguments
+ *    <none>               => STATE_ERROR:
+ *        When constructed with invalid arguments
+ *    STATE_CONSTRUCTED    => STATE_IN_CONFIG:
+ *        When startConfiguration() is called
+ *    STATE_IN_CONFIG      => STATE_CONFIGURED:
+ *        When finishConfiguration() is called
+ *    STATE_IN_CONFIG      => STATE_ERROR:
+ *        When finishConfiguration() fails to allocate or register buffers.
+ *    STATE_CONFIGURED     => STATE_IN_RE_CONFIG:  *
+ *        When startConfiguration() is called again, after making sure stream is
+ *        idle with waitUntilIdle().
+ *    STATE_IN_RE_CONFIG   => STATE_CONFIGURED:
+ *        When finishConfiguration() is called.
+ *    STATE_IN_RE_CONFIG   => STATE_ERROR:
+ *        When finishConfiguration() fails to allocate or register buffers.
+ *    STATE_CONFIGURED     => STATE_CONSTRUCTED:
+ *        When disconnect() is called after making sure stream is idle with
+ *        waitUntilIdle().
+ */
+class Camera3Stream :
+        protected camera3_stream,
+        public LightRefBase<Camera3Stream> {
+  public:
+
+    virtual ~Camera3Stream();
+
+    static Camera3Stream*       cast(camera3_stream *stream);
+    static const Camera3Stream* cast(const camera3_stream *stream);
+
+    /**
+     * Get the stream's ID
+     */
+    int              getId() const;
+
+    /**
+     * Get the stream's dimensions and format
+     */
+    uint32_t         getWidth() const;
+    uint32_t         getHeight() const;
+    int              getFormat() const;
+
+    /**
+     * Start the stream configuration process. Returns a handle to the stream's
+     * information to be passed into the HAL device's configure_streams call.
+     *
+     * Until finishConfiguration() is called, no other methods on the stream may be
+     * called. The usage and max_buffers fields of camera3_stream may be modified
+     * between start/finishConfiguration, but may not be changed after that.
+     * The priv field of camera3_stream may be modified at any time after
+     * startConfiguration.
+     *
+     * Returns NULL in case of error starting configuration.
+     */
+    camera3_stream*  startConfiguration();
+
+    /**
+     * Check if the stream is mid-configuration (start has been called, but not
+     * finish).  Used for lazy completion of configuration.
+     */
+    bool             isConfiguring() const;
+
+    /**
+     * Completes the stream configuration process. During this call, the stream
+     * may call the device's register_stream_buffers() method. The stream
+     * information structure returned by startConfiguration() may no longer be
+     * modified after this call, but can still be read until the destruction of
+     * the stream.
+     *
+     * Returns:
+     *   OK on a successful configuration
+     *   NO_INIT in case of a serious error from the HAL device
+     *   NO_MEMORY in case of an error registering buffers
+     *   INVALID_OPERATION in case connecting to the consumer failed
+     */
+    status_t         finishConfiguration(camera3_device *hal3Device);
+
+    /**
+     * Fill in the camera3_stream_buffer with the next valid buffer for this
+     * stream, to hand over to the HAL.
+     *
+     * This method may only be called once finishConfiguration has been called.
+     * For bidirectional streams, this method applies to the output-side
+     * buffers.
+     *
+     */
+    status_t         getBuffer(camera3_stream_buffer *buffer);
+
+    /**
+     * Return a buffer to the stream after use by the HAL.
+     *
+     * This method may only be called for buffers provided by getBuffer().
+     * For bidirectional streams, this method applies to the output-side buffers
+     */
+    status_t         returnBuffer(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+
+    /**
+     * Whether any of the stream's buffers are currently in use by the HAL,
+     * including buffers that have been returned but not yet had their
+     * release fence signaled.
+     */
+    bool             hasOutstandingBuffers() const;
+
+    enum {
+        TIMEOUT_NEVER = -1
+    };
+    /**
+     * Wait until the HAL is done with all of this stream's buffers, including
+     * signalling all release fences. Returns TIMED_OUT if the timeout is exceeded,
+     * OK on success. Pass in TIMEOUT_NEVER for timeout to indicate an indefinite wait.
+     */
+    virtual status_t waitUntilIdle(nsecs_t timeout) = 0;
+
+    /**
+     * Disconnect stream from its non-HAL endpoint. After this,
+     * start/finishConfiguration must be called before the stream can be used
+     * again. This cannot be called if the stream has outstanding dequeued
+     * buffers.
+     */
+    status_t         disconnect();
+
+    /**
+     * Debug dump of the stream's state.
+     */
+    virtual void     dump(int fd, const Vector<String16> &args) const = 0;
+
+  protected:
+    const int mId;
+    const String8 mName;
+    // Zero for formats with fixed buffer size for given dimensions.
+    const size_t mMaxSize;
+
+    enum {
+        STATE_ERROR,
+        STATE_CONSTRUCTED,
+        STATE_IN_CONFIG,
+        STATE_IN_RECONFIG,
+        STATE_CONFIGURED
+    } mState;
+
+    mutable Mutex mLock;
+
+    Camera3Stream(int id, camera3_stream_type type,
+            uint32_t width, uint32_t height, size_t maxSize, int format);
+
+    /**
+     * Interface to be implemented by derived classes
+     */
+
+    // getBuffer / returnBuffer implementations
+
+    // Since camera3_stream_buffer includes a raw pointer to the stream,
+    // cast to camera3_stream*, implementations must increment the
+    // refcount of the stream manually in getBufferLocked, and decrement it in
+    // returnBufferLocked.
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer) = 0;
+    virtual status_t returnBufferLocked(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp) = 0;
+    virtual bool     hasOutstandingBuffersLocked() const = 0;
+    virtual status_t disconnectLocked() = 0;
+
+    // Configure the buffer queue interface to the other end of the stream,
+    // after the HAL has provided usage and max_buffers values. After this call,
+    // the stream must be ready to produce all buffers for registration with
+    // HAL.
+    virtual status_t configureQueueLocked() = 0;
+
+    // Get the total number of buffers in the queue
+    virtual size_t   getBufferCountLocked() = 0;
+
+  private:
+    static const unsigned int kRegisterFenceTimeoutMs = 5000;
+
+    uint32_t oldUsage;
+    uint32_t oldMaxBuffers;
+
+    // Gets all buffers from endpoint and registers them with the HAL.
+    status_t registerBuffersLocked(camera3_device *hal3Device);
+
+}; // class Camera3Stream
+
+}; // namespace camera3
+
+}; // namespace android
+
+#endif
diff --git a/services/camera/libcameraservice/camera3/Camera3ZslStream.cpp b/services/camera/libcameraservice/camera3/Camera3ZslStream.cpp
new file mode 100644
index 0000000..e8a5ca6
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3ZslStream.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2013 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 "Camera3-ZslStream"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include <utils/Trace.h>
+#include "Camera3ZslStream.h"
+
+namespace android {
+
+namespace camera3 {
+
+Camera3ZslStream::Camera3ZslStream(int id, uint32_t width, uint32_t height,
+        int depth) :
+        Camera3Stream(id, CAMERA3_STREAM_BIDIRECTIONAL, width, height, 0,
+                HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED),
+        mDepth(depth) {
+}
+
+status_t Camera3ZslStream::getBufferLocked(camera3_stream_buffer *buffer) {
+    (void) buffer;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3ZslStream::returnBufferLocked(
+        const camera3_stream_buffer &buffer,
+        nsecs_t timestamp) {
+    (void) buffer;
+    (void) timestamp;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+bool Camera3ZslStream::hasOutstandingBuffersLocked() const {
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return false;
+}
+
+status_t Camera3ZslStream::waitUntilIdle(nsecs_t timeout) {
+    (void) timeout;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3ZslStream::disconnectLocked() {
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3ZslStream::getInputBuffer(camera3_stream_buffer *buffer,
+        nsecs_t timestamp) {
+    (void) buffer;
+    (void) timestamp;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+status_t Camera3ZslStream::returnInputBuffer(const camera3_stream_buffer &buffer) {
+    (void) buffer;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+    return INVALID_OPERATION;
+}
+
+void Camera3ZslStream::dump(int fd, const Vector<String16> &args) const {
+    (void) fd;
+    (void) args;
+    ALOGE("%s: Not implemented", __FUNCTION__);
+}
+
+}; // namespace camera3
+
+}; // namespace android
diff --git a/services/camera/libcameraservice/camera3/Camera3ZslStream.h b/services/camera/libcameraservice/camera3/Camera3ZslStream.h
new file mode 100644
index 0000000..39d5995
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3ZslStream.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+
+#include "Camera3Stream.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single opaque ZSL stream to/from the camera device.
+ * This acts as a bidirectional stream at the HAL layer, caching and discarding
+ * most output buffers, and when directed, pushes a buffer back to the HAL for
+ * processing.
+ */
+class Camera3ZslStream: public Camera3Stream {
+  public:
+    /**
+     * Set up a ZSL stream of a given resolution. Depth is the number of buffers
+     * cached within the stream that can be retrieved for input.
+     */
+    Camera3ZslStream(int id, uint32_t width, uint32_t height, int depth);
+
+    virtual status_t waitUntilIdle(nsecs_t timeout);
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    /**
+     * Get an input buffer matching a specific timestamp. If no buffer matching
+     * the timestamp is available, NO_MEMORY is returned.
+     */
+    status_t getInputBuffer(camera3_stream_buffer *buffer, nsecs_t timestamp);
+
+    /**
+     * Return input buffer from HAL. The buffer is then marked as unfilled, and
+     * returned to the output-side stream for refilling.
+     */
+    status_t returnInputBuffer(const camera3_stream_buffer &buffer);
+
+  private:
+
+    int mDepth;
+
+    /**
+     * Camera3Stream interface
+     */
+
+    // getBuffer/returnBuffer operate the output stream side of the ZslStream.
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnBufferLocked(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+    virtual bool     hasOutstandingBuffersLocked() const;
+    virtual status_t disconnectLocked();
+
+}; // class Camera3ZslStream
+
+}; // namespace camera3
+
+}; // namespace android
+
+#endif