api1/client2/StreamingProcessor.cpp

/*
 * Copyright (C) 2012 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 "Camera2-StreamingProcessor"
#define ATRACE_TAG ATRACE_TAG_CAMERA
//#define LOG_NDEBUG 0
//#define LOG_NNDEBUG 0 // Per-frame verbose logging

#ifdef LOG_NNDEBUG
#define ALOGVV(...) ALOGV(__VA_ARGS__)
#else
#define ALOGVV(...) ((void)0)
#endif

#include <utils/Log.h>
#include <utils/Trace.h>
#include <gui/Surface.h>
#include <media/hardware/MetadataBufferType.h>

#include "common/CameraDeviceBase.h"
#include "api1/Camera2Client.h"
#include "api1/client2/StreamingProcessor.h"
#include "api1/client2/Camera2Heap.h"

namespace android {
namespace camera2 {

StreamingProcessor::StreamingProcessor(sp<Camera2Client> client):
        mClient(client),
        mDevice(client->getCameraDevice()),
        mId(client->getCameraId()),
        mActiveRequest(NONE),
        mPaused(false),
        mPreviewRequestId(Camera2Client::kPreviewRequestIdStart),
        mPreviewStreamId(NO_STREAM),
        mRecordingRequestId(Camera2Client::kRecordingRequestIdStart),
        mRecordingStreamId(NO_STREAM),
        mRecordingFrameAvailable(false),
        mRecordingHeapCount(kDefaultRecordingHeapCount),
        mRecordingHeapFree(kDefaultRecordingHeapCount)
{
}

StreamingProcessor::~StreamingProcessor() {
    deletePreviewStream();
    deleteRecordingStream();
}

status_t StreamingProcessor::setPreviewWindow(sp<ANativeWindow> window) {
    ATRACE_CALL();
    status_t res;

    res = deletePreviewStream();
    if (res != OK) return res;

    Mutex::Autolock m(mMutex);

    mPreviewWindow = window;

    return OK;
}

bool StreamingProcessor::haveValidPreviewWindow() const {
    Mutex::Autolock m(mMutex);
    return mPreviewWindow != 0;
}

status_t StreamingProcessor::updatePreviewRequest(const Parameters &params) {
    ATRACE_CALL();
    status_t res;
    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    Mutex::Autolock m(mMutex);
    if (mPreviewRequest.entryCount() == 0) {
        sp<Camera2Client> client = mClient.promote();
        if (client == 0) {
            ALOGE("%s: Camera %d: Client does not exist", __FUNCTION__, mId);
            return INVALID_OPERATION;
        }

        // Use CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG for ZSL streaming case.
        if (client->getCameraDeviceVersion() >= CAMERA_DEVICE_API_VERSION_3_0) {
            if (params.zslMode && !params.recordingHint) {
                res = device->createDefaultRequest(CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG,
                        &mPreviewRequest);
            } else {
                res = device->createDefaultRequest(CAMERA3_TEMPLATE_PREVIEW,
                        &mPreviewRequest);
            }
        } else {
            res = device->createDefaultRequest(CAMERA2_TEMPLATE_PREVIEW,
                    &mPreviewRequest);
        }

        if (res != OK) {
            ALOGE("%s: Camera %d: Unable to create default preview request: "
                    "%s (%d)", __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
    }

    res = params.updateRequest(&mPreviewRequest);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to update common entries of preview "
                "request: %s (%d)", __FUNCTION__, mId,
                strerror(-res), res);
        return res;
    }

    res = mPreviewRequest.update(ANDROID_REQUEST_ID,
            &mPreviewRequestId, 1);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to update request id for preview: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    return OK;
}

status_t StreamingProcessor::updatePreviewStream(const Parameters &params) {
    ATRACE_CALL();
    Mutex::Autolock m(mMutex);

    status_t res;
    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    if (mPreviewStreamId != NO_STREAM) {
        // Check if stream parameters have to change
        uint32_t currentWidth, currentHeight;
        res = device->getStreamInfo(mPreviewStreamId,
                &currentWidth, &currentHeight, 0);
        if (res != OK) {
            ALOGE("%s: Camera %d: Error querying preview stream info: "
                    "%s (%d)", __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
        if (currentWidth != (uint32_t)params.previewWidth ||
                currentHeight != (uint32_t)params.previewHeight) {
            ALOGV("%s: Camera %d: Preview size switch: %d x %d -> %d x %d",
                    __FUNCTION__, mId, currentWidth, currentHeight,
                    params.previewWidth, params.previewHeight);
            res = device->waitUntilDrained();
            if (res != OK) {
                ALOGE("%s: Camera %d: Error waiting for preview to drain: "
                        "%s (%d)", __FUNCTION__, mId, strerror(-res), res);
                return res;
            }
            res = device->deleteStream(mPreviewStreamId);
            if (res != OK) {
                ALOGE("%s: Camera %d: Unable to delete old output stream "
                        "for preview: %s (%d)", __FUNCTION__, mId,
                        strerror(-res), res);
                return res;
            }
            mPreviewStreamId = NO_STREAM;
        }
    }

    if (mPreviewStreamId == NO_STREAM) {
        res = device->createStream(mPreviewWindow,
                params.previewWidth, params.previewHeight,
                CAMERA2_HAL_PIXEL_FORMAT_OPAQUE, &mPreviewStreamId);
        if (res != OK) {
            ALOGE("%s: Camera %d: Unable to create preview stream: %s (%d)",
                    __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
    }

    res = device->setStreamTransform(mPreviewStreamId,
            params.previewTransform);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to set preview stream transform: "
                "%s (%d)", __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    return OK;
}

status_t StreamingProcessor::deletePreviewStream() {
    ATRACE_CALL();
    status_t res;

    Mutex::Autolock m(mMutex);

    if (mPreviewStreamId != NO_STREAM) {
        sp<CameraDeviceBase> device = mDevice.promote();
        if (device == 0) {
            ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
            return INVALID_OPERATION;
        }

        ALOGV("%s: for cameraId %d on streamId %d",
            __FUNCTION__, mId, mPreviewStreamId);

        res = device->waitUntilDrained();
        if (res != OK) {
            ALOGE("%s: Error waiting for preview to drain: %s (%d)",
                    __FUNCTION__, strerror(-res), res);
            return res;
        }
        res = device->deleteStream(mPreviewStreamId);
        if (res != OK) {
            ALOGE("%s: Unable to delete old preview stream: %s (%d)",
                    __FUNCTION__, strerror(-res), res);
            return res;
        }
        mPreviewStreamId = NO_STREAM;
    }
    return OK;
}

int StreamingProcessor::getPreviewStreamId() const {
    Mutex::Autolock m(mMutex);
    return mPreviewStreamId;
}

status_t StreamingProcessor::setRecordingBufferCount(size_t count) {
    ATRACE_CALL();
    // Make sure we can support this many buffer slots
    if (count > BufferQueue::NUM_BUFFER_SLOTS) {
        ALOGE("%s: Camera %d: Too many recording buffers requested: %zu, max %d",
                __FUNCTION__, mId, count, BufferQueue::NUM_BUFFER_SLOTS);
        return BAD_VALUE;
    }

    Mutex::Autolock m(mMutex);

    ALOGV("%s: Camera %d: New recording buffer count from encoder: %zu",
            __FUNCTION__, mId, count);

    // Need to re-size consumer and heap
    if (mRecordingHeapCount != count) {
        ALOGV("%s: Camera %d: Resetting recording heap and consumer",
            __FUNCTION__, mId);

        if (isStreamActive(mActiveStreamIds, mRecordingStreamId)) {
            ALOGE("%s: Camera %d: Setting recording buffer count when "
                    "recording stream is already active!", __FUNCTION__,
                    mId);
            return INVALID_OPERATION;
        }

        releaseAllRecordingFramesLocked();

        if (mRecordingHeap != 0) {
            mRecordingHeap.clear();
        }
        mRecordingHeapCount = count;
        mRecordingHeapFree = count;

        mRecordingConsumer.clear();
    }

    return OK;
}

status_t StreamingProcessor::updateRecordingRequest(const Parameters &params) {
    ATRACE_CALL();
    status_t res;
    Mutex::Autolock m(mMutex);

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    if (mRecordingRequest.entryCount() == 0) {
        res = device->createDefaultRequest(CAMERA2_TEMPLATE_VIDEO_RECORD,
                &mRecordingRequest);
        if (res != OK) {
            ALOGE("%s: Camera %d: Unable to create default recording request:"
                    " %s (%d)", __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
    }

    res = params.updateRequest(&mRecordingRequest);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to update common entries of recording "
                "request: %s (%d)", __FUNCTION__, mId,
                strerror(-res), res);
        return res;
    }

    res = mRecordingRequest.update(ANDROID_REQUEST_ID,
            &mRecordingRequestId, 1);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to update request id for request: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    return OK;
}

status_t StreamingProcessor::recordingStreamNeedsUpdate(
        const Parameters &params, bool *needsUpdate) {
    status_t res;

    if (needsUpdate == 0) {
        ALOGE("%s: Camera %d: invalid argument", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    if (mRecordingStreamId == NO_STREAM) {
        *needsUpdate = true;
        return OK;
    }

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    uint32_t currentWidth, currentHeight;
    res = device->getStreamInfo(mRecordingStreamId,
            &currentWidth, &currentHeight, 0);
    if (res != OK) {
        ALOGE("%s: Camera %d: Error querying recording output stream info: "
                "%s (%d)", __FUNCTION__, mId,
                strerror(-res), res);
        return res;
    }

    if (mRecordingConsumer == 0 || currentWidth != (uint32_t)params.videoWidth ||
            currentHeight != (uint32_t)params.videoHeight) {
        *needsUpdate = true;
    }
    *needsUpdate = false;
    return res;
}

status_t StreamingProcessor::updateRecordingStream(const Parameters &params) {
    ATRACE_CALL();
    status_t res;
    Mutex::Autolock m(mMutex);

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    bool newConsumer = false;
    if (mRecordingConsumer == 0) {
        ALOGV("%s: Camera %d: Creating recording consumer with %zu + 1 "
                "consumer-side buffers", __FUNCTION__, mId, mRecordingHeapCount);
        // Create CPU buffer queue endpoint. We need one more buffer here so that we can
        // always acquire and free a buffer when the heap is full; otherwise the consumer
        // will have buffers in flight we'll never clear out.
        sp<IGraphicBufferProducer> producer;
        sp<IGraphicBufferConsumer> consumer;
        BufferQueue::createBufferQueue(&producer, &consumer);
        mRecordingConsumer = new BufferItemConsumer(consumer,
                GRALLOC_USAGE_HW_VIDEO_ENCODER,
                mRecordingHeapCount + 1);
        mRecordingConsumer->setFrameAvailableListener(this);
        mRecordingConsumer->setName(String8("Camera2-RecordingConsumer"));
        mRecordingWindow = new Surface(producer);
        newConsumer = true;
        // Allocate memory later, since we don't know buffer size until receipt
    }

    if (mRecordingStreamId != NO_STREAM) {
        // Check if stream parameters have to change
        uint32_t currentWidth, currentHeight;
        res = device->getStreamInfo(mRecordingStreamId,
                &currentWidth, &currentHeight, 0);
        if (res != OK) {
            ALOGE("%s: Camera %d: Error querying recording output stream info: "
                    "%s (%d)", __FUNCTION__, mId,
                    strerror(-res), res);
            return res;
        }
        if (currentWidth != (uint32_t)params.videoWidth ||
                currentHeight != (uint32_t)params.videoHeight || newConsumer) {
            // TODO: Should wait to be sure previous recording has finished
            res = device->deleteStream(mRecordingStreamId);

            if (res == -EBUSY) {
                ALOGV("%s: Camera %d: Device is busy, call "
                      "updateRecordingStream after it becomes idle",
                      __FUNCTION__, mId);
                return res;
            } else if (res != OK) {
                ALOGE("%s: Camera %d: Unable to delete old output stream "
                        "for recording: %s (%d)", __FUNCTION__,
                        mId, strerror(-res), res);
                return res;
            }
            mRecordingStreamId = NO_STREAM;
        }
    }

    if (mRecordingStreamId == NO_STREAM) {
        mRecordingFrameCount = 0;
        res = device->createStream(mRecordingWindow,
                params.videoWidth, params.videoHeight,
                CAMERA2_HAL_PIXEL_FORMAT_OPAQUE, &mRecordingStreamId);
        if (res != OK) {
            ALOGE("%s: Camera %d: Can't create output stream for recording: "
                    "%s (%d)", __FUNCTION__, mId,
                    strerror(-res), res);
            return res;
        }
    }

    return OK;
}

status_t StreamingProcessor::deleteRecordingStream() {
    ATRACE_CALL();
    status_t res;

    Mutex::Autolock m(mMutex);

    if (mRecordingStreamId != NO_STREAM) {
        sp<CameraDeviceBase> device = mDevice.promote();
        if (device == 0) {
            ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
            return INVALID_OPERATION;
        }

        res = device->waitUntilDrained();
        if (res != OK) {
            ALOGE("%s: Error waiting for HAL to drain: %s (%d)",
                    __FUNCTION__, strerror(-res), res);
            return res;
        }
        res = device->deleteStream(mRecordingStreamId);
        if (res != OK) {
            ALOGE("%s: Unable to delete recording stream: %s (%d)",
                    __FUNCTION__, strerror(-res), res);
            return res;
        }
        mRecordingStreamId = NO_STREAM;
    }
    return OK;
}

int StreamingProcessor::getRecordingStreamId() const {
    return mRecordingStreamId;
}

status_t StreamingProcessor::startStream(StreamType type,
        const Vector<int32_t> &outputStreams) {
    ATRACE_CALL();
    status_t res;

    if (type == NONE) return INVALID_OPERATION;

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    ALOGV("%s: Camera %d: type = %d", __FUNCTION__, mId, type);

    Mutex::Autolock m(mMutex);

    // If a recording stream is being started up and no recording
    // stream is active yet, free up any outstanding buffers left
    // from the previous recording session. There should never be
    // any, so if there are, warn about it.
    bool isRecordingStreamIdle = !isStreamActive(mActiveStreamIds, mRecordingStreamId);
    bool startRecordingStream = isStreamActive(outputStreams, mRecordingStreamId);
    if (startRecordingStream && isRecordingStreamIdle) {
        releaseAllRecordingFramesLocked();
    }

    ALOGV("%s: Camera %d: %s started, recording heap has %zu free of %zu",
            __FUNCTION__, mId, (type == PREVIEW) ? "preview" : "recording",
            mRecordingHeapFree, mRecordingHeapCount);

    CameraMetadata &request = (type == PREVIEW) ?
            mPreviewRequest : mRecordingRequest;

    res = request.update(
        ANDROID_REQUEST_OUTPUT_STREAMS,
        outputStreams);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to set up preview request: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    res = request.sort();
    if (res != OK) {
        ALOGE("%s: Camera %d: Error sorting preview request: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    res = device->setStreamingRequest(request);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to set preview request to start preview: "
                "%s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }
    mActiveRequest = type;
    mPaused = false;
    mActiveStreamIds = outputStreams;
    return OK;
}

status_t StreamingProcessor::togglePauseStream(bool pause) {
    ATRACE_CALL();
    status_t res;

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    ALOGV("%s: Camera %d: toggling pause to %d", __FUNCTION__, mId, pause);

    Mutex::Autolock m(mMutex);

    if (mActiveRequest == NONE) {
        ALOGE("%s: Camera %d: Can't toggle pause, streaming was not started",
              __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    if (mPaused == pause) {
        return OK;
    }

    if (pause) {
        res = device->clearStreamingRequest();
        if (res != OK) {
            ALOGE("%s: Camera %d: Can't clear stream request: %s (%d)",
                    __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
    } else {
        CameraMetadata &request =
                (mActiveRequest == PREVIEW) ? mPreviewRequest
                                            : mRecordingRequest;
        res = device->setStreamingRequest(request);
        if (res != OK) {
            ALOGE("%s: Camera %d: Unable to set preview request to resume: "
                    "%s (%d)",
                    __FUNCTION__, mId, strerror(-res), res);
            return res;
        }
    }

    mPaused = pause;
    return OK;
}

status_t StreamingProcessor::stopStream() {
    ATRACE_CALL();
    status_t res;

    Mutex::Autolock m(mMutex);

    sp<CameraDeviceBase> device = mDevice.promote();
    if (device == 0) {
        ALOGE("%s: Camera %d: Device does not exist", __FUNCTION__, mId);
        return INVALID_OPERATION;
    }

    res = device->clearStreamingRequest();
    if (res != OK) {
        ALOGE("%s: Camera %d: Can't clear stream request: %s (%d)",
                __FUNCTION__, mId, strerror(-res), res);
        return res;
    }

    mActiveRequest = NONE;
    mActiveStreamIds.clear();
    mPaused = false;

    return OK;
}

int32_t StreamingProcessor::getActiveRequestId() const {
    Mutex::Autolock m(mMutex);
    switch (mActiveRequest) {
        case NONE:
            return 0;
        case PREVIEW:
            return mPreviewRequestId;
        case RECORD:
            return mRecordingRequestId;
        default:
            ALOGE("%s: Unexpected mode %d", __FUNCTION__, mActiveRequest);
            return 0;
    }
}

status_t StreamingProcessor::incrementStreamingIds() {
    ATRACE_CALL();
    Mutex::Autolock m(mMutex);

    mPreviewRequestId++;
    if (mPreviewRequestId >= Camera2Client::kPreviewRequestIdEnd) {
        mPreviewRequestId = Camera2Client::kPreviewRequestIdStart;
    }
    mRecordingRequestId++;
    if (mRecordingRequestId >= Camera2Client::kRecordingRequestIdEnd) {
        mRecordingRequestId = Camera2Client::kRecordingRequestIdStart;
    }
    return OK;
}

void StreamingProcessor::onFrameAvailable(const BufferItem& /*item*/) {
    ATRACE_CALL();
    Mutex::Autolock l(mMutex);
    if (!mRecordingFrameAvailable) {
        mRecordingFrameAvailable = true;
        mRecordingFrameAvailableSignal.signal();
    }

}

bool StreamingProcessor::threadLoop() {
    status_t res;

    {
        Mutex::Autolock l(mMutex);
        while (!mRecordingFrameAvailable) {
            res = mRecordingFrameAvailableSignal.waitRelative(
                mMutex, kWaitDuration);
            if (res == TIMED_OUT) return true;
        }
        mRecordingFrameAvailable = false;
    }

    do {
        res = processRecordingFrame();
    } while (res == OK);

    return true;
}

status_t StreamingProcessor::processRecordingFrame() {
    ATRACE_CALL();
    status_t res;
    sp<Camera2Heap> recordingHeap;
    size_t heapIdx = 0;
    nsecs_t timestamp;

    sp<Camera2Client> client = mClient.promote();
    if (client == 0) {
        // Discard frames during shutdown
        BufferItemConsumer::BufferItem imgBuffer;
        res = mRecordingConsumer->acquireBuffer(&imgBuffer, 0);
        if (res != OK) {
            if (res != BufferItemConsumer::NO_BUFFER_AVAILABLE) {
                ALOGE("%s: Camera %d: Can't acquire recording buffer: %s (%d)",
                        __FUNCTION__, mId, strerror(-res), res);
            }
            return res;
        }
        mRecordingConsumer->releaseBuffer(imgBuffer);
        return OK;
    }

    {
        /* acquire SharedParameters before mMutex so we don't dead lock
            with Camera2Client code calling into StreamingProcessor */
        SharedParameters::Lock l(client->getParameters());
        Mutex::Autolock m(mMutex);
        BufferItemConsumer::BufferItem imgBuffer;
        res = mRecordingConsumer->acquireBuffer(&imgBuffer, 0);
        if (res != OK) {
            if (res != BufferItemConsumer::NO_BUFFER_AVAILABLE) {
                ALOGE("%s: Camera %d: Can't acquire recording buffer: %s (%d)",
                        __FUNCTION__, mId, strerror(-res), res);
            }
            return res;
        }
        timestamp = imgBuffer.mTimestamp;

        mRecordingFrameCount++;
        ALOGVV("OnRecordingFrame: Frame %d", mRecordingFrameCount);

        if (l.mParameters.state != Parameters::RECORD &&
                l.mParameters.state != Parameters::VIDEO_SNAPSHOT) {
            ALOGV("%s: Camera %d: Discarding recording image buffers "
                    "received after recording done", __FUNCTION__,
                    mId);
            mRecordingConsumer->releaseBuffer(imgBuffer);
            return INVALID_OPERATION;
        }

        if (mRecordingHeap == 0) {
            const size_t bufferSize = 4 + sizeof(buffer_handle_t);
            ALOGV("%s: Camera %d: Creating recording heap with %zu buffers of "
                    "size %zu bytes", __FUNCTION__, mId,
                    mRecordingHeapCount, bufferSize);

            mRecordingHeap = new Camera2Heap(bufferSize, mRecordingHeapCount,
                    "Camera2Client::RecordingHeap");
            if (mRecordingHeap->mHeap->getSize() == 0) {
                ALOGE("%s: Camera %d: Unable to allocate memory for recording",
                        __FUNCTION__, mId);
                mRecordingConsumer->releaseBuffer(imgBuffer);
                return NO_MEMORY;
            }
            for (size_t i = 0; i < mRecordingBuffers.size(); i++) {
                if (mRecordingBuffers[i].mBuf !=
                        BufferItemConsumer::INVALID_BUFFER_SLOT) {
                    ALOGE("%s: Camera %d: Non-empty recording buffers list!",
                            __FUNCTION__, mId);
                }
            }
            mRecordingBuffers.clear();
            mRecordingBuffers.setCapacity(mRecordingHeapCount);
            mRecordingBuffers.insertAt(0, mRecordingHeapCount);

            mRecordingHeapHead = 0;
            mRecordingHeapFree = mRecordingHeapCount;
        }

        if ( mRecordingHeapFree == 0) {
            ALOGE("%s: Camera %d: No free recording buffers, dropping frame",
                    __FUNCTION__, mId);
            mRecordingConsumer->releaseBuffer(imgBuffer);
            return NO_MEMORY;
        }

        heapIdx = mRecordingHeapHead;
        mRecordingHeapHead = (mRecordingHeapHead + 1) % mRecordingHeapCount;
        mRecordingHeapFree--;

        ALOGVV("%s: Camera %d: Timestamp %lld",
                __FUNCTION__, mId, timestamp);

        ssize_t offset;
        size_t size;
        sp<IMemoryHeap> heap =
                mRecordingHeap->mBuffers[heapIdx]->getMemory(&offset,
                        &size);

        uint8_t *data = (uint8_t*)heap->getBase() + offset;
        uint32_t type = kMetadataBufferTypeGrallocSource;
        *((uint32_t*)data) = type;
        *((buffer_handle_t*)(data + 4)) = imgBuffer.mGraphicBuffer->handle;
        ALOGVV("%s: Camera %d: Sending out buffer_handle_t %p",
                __FUNCTION__, mId,
                imgBuffer.mGraphicBuffer->handle);
        mRecordingBuffers.replaceAt(imgBuffer, heapIdx);
        recordingHeap = mRecordingHeap;
    }

    // Call outside locked parameters to allow re-entrancy from notification
    Camera2Client::SharedCameraCallbacks::Lock l(client->mSharedCameraCallbacks);
    if (l.mRemoteCallback != 0) {
        l.mRemoteCallback->dataCallbackTimestamp(timestamp,
                CAMERA_MSG_VIDEO_FRAME,
                recordingHeap->mBuffers[heapIdx]);
    } else {
        ALOGW("%s: Camera %d: Remote callback gone", __FUNCTION__, mId);
    }

    return OK;
}

void StreamingProcessor::releaseRecordingFrame(const sp<IMemory>& mem) {
    ATRACE_CALL();
    status_t res;

    Mutex::Autolock m(mMutex);
    // Make sure this is for the current heap
    ssize_t offset;
    size_t size;
    sp<IMemoryHeap> heap = mem->getMemory(&offset, &size);
    if (heap->getHeapID() != mRecordingHeap->mHeap->getHeapID()) {
        ALOGW("%s: Camera %d: Mismatched heap ID, ignoring release "
                "(got %x, expected %x)", __FUNCTION__, mId,
                heap->getHeapID(), mRecordingHeap->mHeap->getHeapID());
        return;
    }
    uint8_t *data = (uint8_t*)heap->getBase() + offset;
    uint32_t type = *(uint32_t*)data;
    if (type != kMetadataBufferTypeGrallocSource) {
        ALOGE("%s: Camera %d: Recording frame type invalid (got %x, expected %x)",
                __FUNCTION__, mId, type,
                kMetadataBufferTypeGrallocSource);
        return;
    }

    // Release the buffer back to the recording queue

    buffer_handle_t imgHandle = *(buffer_handle_t*)(data + 4);

    size_t itemIndex;
    for (itemIndex = 0; itemIndex < mRecordingBuffers.size(); itemIndex++) {
        const BufferItemConsumer::BufferItem item =
                mRecordingBuffers[itemIndex];
        if (item.mBuf != BufferItemConsumer::INVALID_BUFFER_SLOT &&
                item.mGraphicBuffer->handle == imgHandle) {
            break;
        }
    }
    if (itemIndex == mRecordingBuffers.size()) {
        ALOGE("%s: Camera %d: Can't find buffer_handle_t %p in list of "
                "outstanding buffers", __FUNCTION__, mId,
                imgHandle);
        return;
    }

    ALOGVV("%s: Camera %d: Freeing buffer_handle_t %p", __FUNCTION__,
            mId, imgHandle);

    res = mRecordingConsumer->releaseBuffer(mRecordingBuffers[itemIndex]);
    if (res != OK) {
        ALOGE("%s: Camera %d: Unable to free recording frame "
                "(buffer_handle_t: %p): %s (%d)", __FUNCTION__,
                mId, imgHandle, strerror(-res), res);
        return;
    }
    mRecordingBuffers.replaceAt(itemIndex);

    mRecordingHeapFree++;
    ALOGV_IF(mRecordingHeapFree == mRecordingHeapCount,
            "%s: Camera %d: All %d recording buffers returned",
            __FUNCTION__, mId, mRecordingHeapCount);
}

void StreamingProcessor::releaseAllRecordingFramesLocked() {
    ATRACE_CALL();
    status_t res;

    if (mRecordingConsumer == 0) {
        return;
    }

    ALOGV("%s: Camera %d: Releasing all recording buffers", __FUNCTION__,
            mId);

    size_t releasedCount = 0;
    for (size_t itemIndex = 0; itemIndex < mRecordingBuffers.size(); itemIndex++) {
        const BufferItemConsumer::BufferItem item =
                mRecordingBuffers[itemIndex];
        if (item.mBuf != BufferItemConsumer::INVALID_BUFFER_SLOT) {
            res = mRecordingConsumer->releaseBuffer(mRecordingBuffers[itemIndex]);
            if (res != OK) {
                ALOGE("%s: Camera %d: Unable to free recording frame "
                        "(buffer_handle_t: %p): %s (%d)", __FUNCTION__,
                        mId, item.mGraphicBuffer->handle, strerror(-res), res);
            }
            mRecordingBuffers.replaceAt(itemIndex);
            releasedCount++;
        }
    }

    if (releasedCount > 0) {
        ALOGW("%s: Camera %d: Force-freed %zu outstanding buffers "
                "from previous recording session", __FUNCTION__, mId, releasedCount);
        ALOGE_IF(releasedCount != mRecordingHeapCount - mRecordingHeapFree,
            "%s: Camera %d: Force-freed %zu buffers, but expected %zu",
            __FUNCTION__, mId, releasedCount, mRecordingHeapCount - mRecordingHeapFree);
    }

    mRecordingHeapHead = 0;
    mRecordingHeapFree = mRecordingHeapCount;
}

bool StreamingProcessor::isStreamActive(const Vector<int32_t> &streams,
        int32_t recordingStreamId) {
    for (size_t i = 0; i < streams.size(); i++) {
        if (streams[i] == recordingStreamId) {
            return true;
        }
    }
    return false;
}


status_t StreamingProcessor::dump(int fd, const Vector<String16>& /*args*/) {
    String8 result;

    result.append("  Current requests:\n");
    if (mPreviewRequest.entryCount() != 0) {
        result.append("    Preview request:\n");
        write(fd, result.string(), result.size());
        mPreviewRequest.dump(fd, 2, 6);
        result.clear();
    } else {
        result.append("    Preview request: undefined\n");
    }

    if (mRecordingRequest.entryCount() != 0) {
        result = "    Recording request:\n";
        write(fd, result.string(), result.size());
        mRecordingRequest.dump(fd, 2, 6);
        result.clear();
    } else {
        result = "    Recording request: undefined\n";
    }

    const char* streamTypeString[] = {
        "none", "preview", "record"
    };
    result.append(String8::format("   Active request: %s (paused: %s)\n",
                                  streamTypeString[mActiveRequest],
                                  mPaused ? "yes" : "no"));

    write(fd, result.string(), result.size());

    return OK;
}

}; // namespace camera2
}; // namespace android