media/jni/android_media_ImageReader.cpp

/*
 * Copyright 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_NDEBUG 0
#define LOG_TAG "ImageReader_JNI"
#include <utils/Log.h>
#include <utils/misc.h>
#include <utils/List.h>
#include <utils/String8.h>

#include <cstdio>

#include <gui/CpuConsumer.h>
#include <gui/Surface.h>
#include <camera3.h>

#include <android_runtime/AndroidRuntime.h>
#include <android_runtime/android_view_Surface.h>

#include <jni.h>
#include <JNIHelp.h>

#include <stdint.h>
#include <inttypes.h>

#define ALIGN(x, mask) ( ((x) + (mask) - 1) & ~((mask) - 1) )

#define ANDROID_MEDIA_IMAGEREADER_CTX_JNI_ID       "mNativeContext"
#define ANDROID_MEDIA_SURFACEIMAGE_BUFFER_JNI_ID   "mLockedBuffer"
#define ANDROID_MEDIA_SURFACEIMAGE_TS_JNI_ID       "mTimestamp"

// ----------------------------------------------------------------------------

using namespace android;

enum {
    IMAGE_READER_MAX_NUM_PLANES = 3,
};

enum {
    ACQUIRE_SUCCESS = 0,
    ACQUIRE_NO_BUFFERS = 1,
    ACQUIRE_MAX_IMAGES = 2,
};

static struct {
    jfieldID mNativeContext;
    jmethodID postEventFromNative;
} gImageReaderClassInfo;

static struct {
    jfieldID mLockedBuffer;
    jfieldID mTimestamp;
} gSurfaceImageClassInfo;

static struct {
    jclass clazz;
    jmethodID ctor;
} gSurfacePlaneClassInfo;

// ----------------------------------------------------------------------------

class JNIImageReaderContext : public CpuConsumer::FrameAvailableListener
{
public:
    JNIImageReaderContext(JNIEnv* env, jobject weakThiz, jclass clazz, int maxImages);

    virtual ~JNIImageReaderContext();

    virtual void onFrameAvailable();

    CpuConsumer::LockedBuffer* getLockedBuffer();

    void returnLockedBuffer(CpuConsumer::LockedBuffer* buffer);

    void setCpuConsumer(const sp<CpuConsumer>& consumer) { mConsumer = consumer; }
    CpuConsumer* getCpuConsumer() { return mConsumer.get(); }

    void setProducer(const sp<IGraphicBufferProducer>& producer) { mProducer = producer; }
    IGraphicBufferProducer* getProducer() { return mProducer.get(); }

    void setBufferFormat(int format) { mFormat = format; }
    int getBufferFormat() { return mFormat; }

    void setBufferWidth(int width) { mWidth = width; }
    int getBufferWidth() { return mWidth; }

    void setBufferHeight(int height) { mHeight = height; }
    int getBufferHeight() { return mHeight; }

private:
    static JNIEnv* getJNIEnv(bool* needsDetach);
    static void detachJNI();

    List<CpuConsumer::LockedBuffer*> mBuffers;
    sp<CpuConsumer> mConsumer;
    sp<IGraphicBufferProducer> mProducer;
    jobject mWeakThiz;
    jclass mClazz;
    int mFormat;
    int mWidth;
    int mHeight;
};

JNIImageReaderContext::JNIImageReaderContext(JNIEnv* env,
        jobject weakThiz, jclass clazz, int maxImages) :
    mWeakThiz(env->NewGlobalRef(weakThiz)),
    mClazz((jclass)env->NewGlobalRef(clazz)) {
    for (int i = 0; i < maxImages; i++) {
        CpuConsumer::LockedBuffer *buffer = new CpuConsumer::LockedBuffer;
        mBuffers.push_back(buffer);
    }
}

JNIEnv* JNIImageReaderContext::getJNIEnv(bool* needsDetach) {
    LOG_ALWAYS_FATAL_IF(needsDetach == NULL, "needsDetach is null!!!");
    *needsDetach = false;
    JNIEnv* env = AndroidRuntime::getJNIEnv();
    if (env == NULL) {
        JavaVMAttachArgs args = {JNI_VERSION_1_4, NULL, NULL};
        JavaVM* vm = AndroidRuntime::getJavaVM();
        int result = vm->AttachCurrentThread(&env, (void*) &args);
        if (result != JNI_OK) {
            ALOGE("thread attach failed: %#x", result);
            return NULL;
        }
        *needsDetach = true;
    }
    return env;
}

void JNIImageReaderContext::detachJNI() {
    JavaVM* vm = AndroidRuntime::getJavaVM();
    int result = vm->DetachCurrentThread();
    if (result != JNI_OK) {
        ALOGE("thread detach failed: %#x", result);
    }
}

CpuConsumer::LockedBuffer* JNIImageReaderContext::getLockedBuffer() {
    if (mBuffers.empty()) {
        return NULL;
    }
    // Return a LockedBuffer pointer and remove it from the list
    List<CpuConsumer::LockedBuffer*>::iterator it = mBuffers.begin();
    CpuConsumer::LockedBuffer* buffer = *it;
    mBuffers.erase(it);
    return buffer;
}

void JNIImageReaderContext::returnLockedBuffer(CpuConsumer::LockedBuffer* buffer) {
    mBuffers.push_back(buffer);
}

JNIImageReaderContext::~JNIImageReaderContext() {
    bool needsDetach = false;
    JNIEnv* env = getJNIEnv(&needsDetach);
    if (env != NULL) {
        env->DeleteGlobalRef(mWeakThiz);
        env->DeleteGlobalRef(mClazz);
    } else {
        ALOGW("leaking JNI object references");
    }
    if (needsDetach) {
        detachJNI();
    }

    // Delete LockedBuffers
    for (List<CpuConsumer::LockedBuffer *>::iterator it = mBuffers.begin();
            it != mBuffers.end(); it++) {
        delete *it;
    }
    mBuffers.clear();
    mConsumer.clear();
}

void JNIImageReaderContext::onFrameAvailable()
{
    ALOGV("%s: frame available", __FUNCTION__);
    bool needsDetach = false;
    JNIEnv* env = getJNIEnv(&needsDetach);
    if (env != NULL) {
        env->CallStaticVoidMethod(mClazz, gImageReaderClassInfo.postEventFromNative, mWeakThiz);
    } else {
        ALOGW("onFrameAvailable event will not posted");
    }
    if (needsDetach) {
        detachJNI();
    }
}

// ----------------------------------------------------------------------------

extern "C" {

static JNIImageReaderContext* ImageReader_getContext(JNIEnv* env, jobject thiz)
{
    JNIImageReaderContext *ctx;
    ctx = reinterpret_cast<JNIImageReaderContext *>
              (env->GetLongField(thiz, gImageReaderClassInfo.mNativeContext));
    return ctx;
}

static CpuConsumer* ImageReader_getCpuConsumer(JNIEnv* env, jobject thiz)
{
    ALOGV("%s:", __FUNCTION__);
    JNIImageReaderContext* const ctx = ImageReader_getContext(env, thiz);
    if (ctx == NULL) {
        jniThrowRuntimeException(env, "ImageReaderContext is not initialized");
        return NULL;
    }
    return ctx->getCpuConsumer();
}

static IGraphicBufferProducer* ImageReader_getProducer(JNIEnv* env, jobject thiz)
{
    ALOGV("%s:", __FUNCTION__);
    JNIImageReaderContext* const ctx = ImageReader_getContext(env, thiz);
    if (ctx == NULL) {
        jniThrowRuntimeException(env, "ImageReaderContext is not initialized");
        return NULL;
    }
    return ctx->getProducer();
}

static void ImageReader_setNativeContext(JNIEnv* env,
        jobject thiz, sp<JNIImageReaderContext> ctx)
{
    ALOGV("%s:", __FUNCTION__);
    JNIImageReaderContext* const p = ImageReader_getContext(env, thiz);
    if (ctx != 0) {
        ctx->incStrong((void*)ImageReader_setNativeContext);
    }
    if (p) {
        p->decStrong((void*)ImageReader_setNativeContext);
    }
    env->SetLongField(thiz, gImageReaderClassInfo.mNativeContext,
            reinterpret_cast<jlong>(ctx.get()));
}

static CpuConsumer::LockedBuffer* Image_getLockedBuffer(JNIEnv* env, jobject image)
{
    return reinterpret_cast<CpuConsumer::LockedBuffer*>(
            env->GetLongField(image, gSurfaceImageClassInfo.mLockedBuffer));
}

static void Image_setBuffer(JNIEnv* env, jobject thiz,
        const CpuConsumer::LockedBuffer* buffer)
{
    env->SetLongField(thiz, gSurfaceImageClassInfo.mLockedBuffer, reinterpret_cast<jlong>(buffer));
}

// Some formats like JPEG defined with different values between android.graphics.ImageFormat and
// graphics.h, need convert to the one defined in graphics.h here.
static int Image_getPixelFormat(JNIEnv* env, int format)
{
    int jpegFormat, rawSensorFormat;
    jfieldID fid;

    ALOGV("%s: format = 0x%x", __FUNCTION__, format);

    jclass imageFormatClazz = env->FindClass("android/graphics/ImageFormat");
    ALOG_ASSERT(imageFormatClazz != NULL);

    fid = env->GetStaticFieldID(imageFormatClazz, "JPEG", "I");
    jpegFormat = env->GetStaticIntField(imageFormatClazz, fid);

    // Translate the JPEG to BLOB for camera purpose.
    if (format == jpegFormat) {
        format = HAL_PIXEL_FORMAT_BLOB;
    }

    return format;
}

static uint32_t Image_getJpegSize(CpuConsumer::LockedBuffer* buffer)
{
    ALOG_ASSERT(buffer != NULL, "Input buffer is NULL!!!");
    uint32_t size = 0;
    uint32_t width = buffer->width;
    uint8_t* jpegBuffer = buffer->data;

    // First check for JPEG transport header at the end of the buffer
    uint8_t* header = jpegBuffer + (width - sizeof(struct camera3_jpeg_blob));
    struct camera3_jpeg_blob *blob = (struct camera3_jpeg_blob*)(header);
    if (blob->jpeg_blob_id == CAMERA3_JPEG_BLOB_ID) {
        size = blob->jpeg_size;
        ALOGV("%s: Jpeg size = %d", __FUNCTION__, size);
    }

    // failed to find size, default to whole buffer
    if (size == 0) {
        /*
         * This is a problem because not including the JPEG header
         * means that in certain rare situations a regular JPEG blob
         * will be misidentified as having a header, in which case
         * we will get a garbage size value.
         */
        ALOGW("%s: No JPEG header detected, defaulting to size=width=%d",
                __FUNCTION__, width);
        size = width;
    }

    return size;
}

static void Image_getLockedBufferInfo(JNIEnv* env, CpuConsumer::LockedBuffer* buffer, int idx,
                                uint8_t **base, uint32_t *size)
{
    ALOG_ASSERT(buffer != NULL, "Input buffer is NULL!!!");
    ALOG_ASSERT(base != NULL, "base is NULL!!!");
    ALOG_ASSERT(size != NULL, "size is NULL!!!");
    ALOG_ASSERT((idx < IMAGE_READER_MAX_NUM_PLANES) && (idx >= 0));

    ALOGV("%s: buffer: %p", __FUNCTION__, buffer);

    uint32_t dataSize, ySize, cSize, cStride;
    uint8_t *cb, *cr;
    uint8_t *pData = NULL;
    int bytesPerPixel = 0;

    dataSize = ySize = cSize = cStride = 0;
    int32_t fmt = buffer->format;
    switch (fmt) {
        case HAL_PIXEL_FORMAT_YCbCr_420_888:
            pData =
                (idx == 0) ?
                    buffer->data :
                (idx == 1) ?
                    buffer->dataCb :
                buffer->dataCr;
            if (idx == 0) {
                dataSize = buffer->stride * buffer->height;
            } else {
                dataSize = buffer->chromaStride * buffer->height / 2;
            }
            break;
        // NV21
        case HAL_PIXEL_FORMAT_YCrCb_420_SP:
            cr = buffer->data + (buffer->stride * buffer->height);
            cb = cr + 1;
            ySize = buffer->width * buffer->height;
            cSize = buffer->width * buffer->height / 2;

            pData =
                (idx == 0) ?
                    buffer->data :
                (idx == 1) ?
                    cb:
                cr;

            dataSize = (idx == 0) ? ySize : cSize;
            break;
        case HAL_PIXEL_FORMAT_YV12:
            // Y and C stride need to be 16 pixel aligned.
            LOG_ALWAYS_FATAL_IF(buffer->stride % 16,
                                "Stride is not 16 pixel aligned %d", buffer->stride);

            ySize = buffer->stride * buffer->height;
            cStride = ALIGN(buffer->stride / 2, 16);
            cr = buffer->data + ySize;
            cSize = cStride * buffer->height / 2;
            cb = cr + cSize;

            pData =
                (idx == 0) ?
                    buffer->data :
                (idx == 1) ?
                    cb :
                cr;
            dataSize = (idx == 0) ? ySize : cSize;
            break;
        case HAL_PIXEL_FORMAT_Y8:
            // Single plane, 8bpp.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);

            pData = buffer->data;
            dataSize = buffer->stride * buffer->height;
            break;
        case HAL_PIXEL_FORMAT_Y16:
            bytesPerPixel = 2;
            // Single plane, 16bpp, strides are specified in pixels, not in bytes
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);

            pData = buffer->data;
            dataSize = buffer->stride * buffer->height * bytesPerPixel;
            break;
        case HAL_PIXEL_FORMAT_BLOB:
            // Used for JPEG data, height must be 1, width == size, single plane.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            ALOG_ASSERT(buffer->height == 1, "JPEG should has height value %d", buffer->height);

            pData = buffer->data;
            dataSize = Image_getJpegSize(buffer);
            break;
        case HAL_PIXEL_FORMAT_RAW_SENSOR:
            // Single plane 16bpp bayer data.
            bytesPerPixel = 2;
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pData = buffer->data;
            dataSize = buffer->stride * buffer->height * bytesPerPixel;
            break;
        case HAL_PIXEL_FORMAT_RGBA_8888:
        case HAL_PIXEL_FORMAT_RGBX_8888:
            // Single plane, 32bpp.
            bytesPerPixel = 4;
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pData = buffer->data;
            dataSize = buffer->stride * buffer->height * bytesPerPixel;
            break;
        case HAL_PIXEL_FORMAT_RGB_565:
            // Single plane, 16bpp.
            bytesPerPixel = 2;
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pData = buffer->data;
            dataSize = buffer->stride * buffer->height * bytesPerPixel;
            break;
        case HAL_PIXEL_FORMAT_RGB_888:
            // Single plane, 24bpp.
            bytesPerPixel = 3;
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pData = buffer->data;
            dataSize = buffer->stride * buffer->height * bytesPerPixel;
            break;
        default:
            jniThrowExceptionFmt(env, "java/lang/UnsupportedOperationException",
                                 "Pixel format: 0x%x is unsupported", fmt);
            break;
    }

    *base = pData;
    *size = dataSize;
}

static jint Image_imageGetPixelStride(JNIEnv* env, CpuConsumer::LockedBuffer* buffer, int idx)
{
    ALOGV("%s: buffer index: %d", __FUNCTION__, idx);
    ALOG_ASSERT((idx < IMAGE_READER_MAX_NUM_PLANES) && (idx >= 0), "Index is out of range:%d", idx);

    int pixelStride = 0;
    ALOG_ASSERT(buffer != NULL, "buffer is NULL");

    int32_t fmt = buffer->format;
    switch (fmt) {
        case HAL_PIXEL_FORMAT_YCbCr_420_888:
            pixelStride = (idx == 0) ? 1 : buffer->chromaStep;
            break;
        case HAL_PIXEL_FORMAT_YCrCb_420_SP:
            pixelStride = (idx == 0) ? 1 : 2;
            break;
        case HAL_PIXEL_FORMAT_Y8:
            // Single plane 8bpp data.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pixelStride;
            break;
        case HAL_PIXEL_FORMAT_YV12:
            pixelStride = 1;
            break;
        case HAL_PIXEL_FORMAT_BLOB:
            // Used for JPEG data, single plane, row and pixel strides are 0
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pixelStride = 0;
            break;
        case HAL_PIXEL_FORMAT_Y16:
        case HAL_PIXEL_FORMAT_RAW_SENSOR:
        case HAL_PIXEL_FORMAT_RGB_565:
            // Single plane 16bpp data.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pixelStride = 2;
            break;
        case HAL_PIXEL_FORMAT_RGBA_8888:
        case HAL_PIXEL_FORMAT_RGBX_8888:
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pixelStride = 4;
            break;
        case HAL_PIXEL_FORMAT_RGB_888:
            // Single plane, 24bpp.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            pixelStride = 3;
            break;
        default:
            jniThrowExceptionFmt(env, "java/lang/UnsupportedOperationException",
                                 "Pixel format: 0x%x is unsupported", fmt);
            break;
    }

    return pixelStride;
}

static jint Image_imageGetRowStride(JNIEnv* env, CpuConsumer::LockedBuffer* buffer, int idx)
{
    ALOGV("%s: buffer index: %d", __FUNCTION__, idx);
    ALOG_ASSERT((idx < IMAGE_READER_MAX_NUM_PLANES) && (idx >= 0));

    int rowStride = 0;
    ALOG_ASSERT(buffer != NULL, "buffer is NULL");

    int32_t fmt = buffer->format;

    switch (fmt) {
        case HAL_PIXEL_FORMAT_YCbCr_420_888:
            rowStride = (idx == 0) ? buffer->stride : buffer->chromaStride;
            break;
        case HAL_PIXEL_FORMAT_YCrCb_420_SP:
            rowStride = buffer->width;
            break;
        case HAL_PIXEL_FORMAT_YV12:
            LOG_ALWAYS_FATAL_IF(buffer->stride % 16,
                                "Stride is not 16 pixel aligned %d", buffer->stride);
            rowStride = (idx == 0) ? buffer->stride : ALIGN(buffer->stride / 2, 16);
            break;
        case HAL_PIXEL_FORMAT_BLOB:
            // Used for JPEG data, single plane, row and pixel strides are 0
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            rowStride = 0;
            break;
        case HAL_PIXEL_FORMAT_Y8:
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            LOG_ALWAYS_FATAL_IF(buffer->stride % 16,
                                "Stride is not 16 pixel aligned %d", buffer->stride);
            rowStride = buffer->stride;
            break;
        case HAL_PIXEL_FORMAT_Y16:
        case HAL_PIXEL_FORMAT_RAW_SENSOR:
            // In native side, strides are specified in pixels, not in bytes.
            // Single plane 16bpp bayer data. even width/height,
            // row stride multiple of 16 pixels (32 bytes)
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            LOG_ALWAYS_FATAL_IF(buffer->stride % 16,
                                "Stride is not 16 pixel aligned %d", buffer->stride);
            rowStride = buffer->stride * 2;
            break;
        case HAL_PIXEL_FORMAT_RGB_565:
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            rowStride = buffer->stride * 2;
            break;
        case HAL_PIXEL_FORMAT_RGBA_8888:
        case HAL_PIXEL_FORMAT_RGBX_8888:
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            rowStride = buffer->stride * 4;
            break;
        case HAL_PIXEL_FORMAT_RGB_888:
            // Single plane, 24bpp.
            ALOG_ASSERT(idx == 0, "Wrong index: %d", idx);
            rowStride = buffer->stride * 3;
            break;
        default:
            ALOGE("%s Pixel format: 0x%x is unsupported", __FUNCTION__, fmt);
            jniThrowException(env, "java/lang/UnsupportedOperationException",
                              "unsupported buffer format");
          break;
    }

    return rowStride;
}

// ----------------------------------------------------------------------------

static void ImageReader_classInit(JNIEnv* env, jclass clazz)
{
    ALOGV("%s:", __FUNCTION__);

    jclass imageClazz = env->FindClass("android/media/ImageReader$SurfaceImage");
    LOG_ALWAYS_FATAL_IF(imageClazz == NULL,
                        "can't find android/graphics/ImageReader$SurfaceImage");
    gSurfaceImageClassInfo.mLockedBuffer = env->GetFieldID(
            imageClazz, ANDROID_MEDIA_SURFACEIMAGE_BUFFER_JNI_ID, "J");
    LOG_ALWAYS_FATAL_IF(gSurfaceImageClassInfo.mLockedBuffer == NULL,
                        "can't find android/graphics/ImageReader.%s",
                        ANDROID_MEDIA_SURFACEIMAGE_BUFFER_JNI_ID);

    gSurfaceImageClassInfo.mTimestamp = env->GetFieldID(
            imageClazz, ANDROID_MEDIA_SURFACEIMAGE_TS_JNI_ID, "J");
    LOG_ALWAYS_FATAL_IF(gSurfaceImageClassInfo.mTimestamp == NULL,
                        "can't find android/graphics/ImageReader.%s",
                        ANDROID_MEDIA_SURFACEIMAGE_TS_JNI_ID);

    gImageReaderClassInfo.mNativeContext = env->GetFieldID(
            clazz, ANDROID_MEDIA_IMAGEREADER_CTX_JNI_ID, "J");
    LOG_ALWAYS_FATAL_IF(gImageReaderClassInfo.mNativeContext == NULL,
                        "can't find android/graphics/ImageReader.%s",
                          ANDROID_MEDIA_IMAGEREADER_CTX_JNI_ID);

    gImageReaderClassInfo.postEventFromNative = env->GetStaticMethodID(
            clazz, "postEventFromNative", "(Ljava/lang/Object;)V");
    LOG_ALWAYS_FATAL_IF(gImageReaderClassInfo.postEventFromNative == NULL,
                        "can't find android/graphics/ImageReader.postEventFromNative");

    jclass planeClazz = env->FindClass("android/media/ImageReader$SurfaceImage$SurfacePlane");
    LOG_ALWAYS_FATAL_IF(planeClazz == NULL, "Can not find SurfacePlane class");
    // FindClass only gives a local reference of jclass object.
    gSurfacePlaneClassInfo.clazz = (jclass) env->NewGlobalRef(planeClazz);
    gSurfacePlaneClassInfo.ctor = env->GetMethodID(gSurfacePlaneClassInfo.clazz, "<init>",
            "(Landroid/media/ImageReader$SurfaceImage;III)V");
    LOG_ALWAYS_FATAL_IF(gSurfacePlaneClassInfo.ctor == NULL,
            "Can not find SurfacePlane constructor");
}

static void ImageReader_init(JNIEnv* env, jobject thiz, jobject weakThiz,
                             jint width, jint height, jint format, jint maxImages)
{
    status_t res;
    int nativeFormat;

    ALOGV("%s: width:%d, height: %d, format: 0x%x, maxImages:%d",
          __FUNCTION__, width, height, format, maxImages);

    nativeFormat = Image_getPixelFormat(env, format);

    sp<IGraphicBufferProducer> gbProducer;
    sp<IGraphicBufferConsumer> gbConsumer;
    BufferQueue::createBufferQueue(&gbProducer, &gbConsumer);
    sp<CpuConsumer> consumer = new CpuConsumer(gbConsumer, maxImages,
                                               /*controlledByApp*/true);
    // TODO: throw dvm exOutOfMemoryError?
    if (consumer == NULL) {
        jniThrowRuntimeException(env, "Failed to allocate native CpuConsumer");
        return;
    }

    jclass clazz = env->GetObjectClass(thiz);
    if (clazz == NULL) {
        jniThrowRuntimeException(env, "Can't find android/graphics/ImageReader");
        return;
    }
    sp<JNIImageReaderContext> ctx(new JNIImageReaderContext(env, weakThiz, clazz, maxImages));
    ctx->setCpuConsumer(consumer);
    ctx->setProducer(gbProducer);
    consumer->setFrameAvailableListener(ctx);
    ImageReader_setNativeContext(env, thiz, ctx);
    ctx->setBufferFormat(nativeFormat);
    ctx->setBufferWidth(width);
    ctx->setBufferHeight(height);

    // Set the width/height/format to the CpuConsumer
    res = consumer->setDefaultBufferSize(width, height);
    if (res != OK) {
        jniThrowException(env, "java/lang/IllegalStateException",
                          "Failed to set CpuConsumer buffer size");
        return;
    }
    res = consumer->setDefaultBufferFormat(nativeFormat);
    if (res != OK) {
        jniThrowException(env, "java/lang/IllegalStateException",
                          "Failed to set CpuConsumer buffer format");
    }
}

static void ImageReader_close(JNIEnv* env, jobject thiz)
{
    ALOGV("%s:", __FUNCTION__);

    JNIImageReaderContext* const ctx = ImageReader_getContext(env, thiz);
    if (ctx == NULL) {
        // ImageReader is already closed.
        return;
    }

    CpuConsumer* consumer = ImageReader_getCpuConsumer(env, thiz);
    if (consumer != NULL) {
        consumer->abandon();
        consumer->setFrameAvailableListener(NULL);
    }
    ImageReader_setNativeContext(env, thiz, NULL);
}

static void ImageReader_imageRelease(JNIEnv* env, jobject thiz, jobject image)
{
    ALOGV("%s:", __FUNCTION__);
    JNIImageReaderContext* ctx = ImageReader_getContext(env, thiz);
    if (ctx == NULL) {
        ALOGW("ImageReader#close called before Image#close, consider calling Image#close first");
        return;
    }

    CpuConsumer* consumer = ctx->getCpuConsumer();
    CpuConsumer::LockedBuffer* buffer = Image_getLockedBuffer(env, image);
    if (!buffer) {
        ALOGW("Image already released!!!");
        return;
    }
    consumer->unlockBuffer(*buffer);
    Image_setBuffer(env, image, NULL);
    ctx->returnLockedBuffer(buffer);
}

static jint ImageReader_imageSetup(JNIEnv* env, jobject thiz,
                                             jobject image)
{
    ALOGV("%s:", __FUNCTION__);
    JNIImageReaderContext* ctx = ImageReader_getContext(env, thiz);
    if (ctx == NULL) {
        jniThrowRuntimeException(env, "ImageReaderContext is not initialized");
        return -1;
    }

    CpuConsumer* consumer = ctx->getCpuConsumer();
    CpuConsumer::LockedBuffer* buffer = ctx->getLockedBuffer();
    if (buffer == NULL) {
        ALOGW("Unable to acquire a lockedBuffer, very likely client tries to lock more than"
            " maxImages buffers");
        return ACQUIRE_MAX_IMAGES;
    }
    status_t res = consumer->lockNextBuffer(buffer);
    if (res != NO_ERROR) {
        ctx->returnLockedBuffer(buffer);
        if (res != BAD_VALUE /*no buffers*/) {
            if (res == NOT_ENOUGH_DATA) {
                return ACQUIRE_MAX_IMAGES;
            } else {
                ALOGE("%s Fail to lockNextBuffer with error: %d ",
                      __FUNCTION__, res);
                jniThrowExceptionFmt(env, "java/lang/AssertionError",
                          "Unknown error (%d) when we tried to lock buffer.",
                          res);
            }
        }
        return ACQUIRE_NO_BUFFERS;
    }

    if (buffer->format == HAL_PIXEL_FORMAT_YCrCb_420_SP) {
        jniThrowException(env, "java/lang/UnsupportedOperationException",
                "NV21 format is not supported by ImageReader");
        return -1;
    }

    // Check if the left-top corner of the crop rect is origin, we currently assume this point is
    // zero, will revist this once this assumption turns out problematic.
    Point lt = buffer->crop.leftTop();
    if (lt.x != 0 || lt.y != 0) {
        jniThrowExceptionFmt(env, "java/lang/UnsupportedOperationException",
                "crop left top corner [%d, %d] need to be at origin", lt.x, lt.y);
        return -1;
    }

    // Check if the producer buffer configurations match what ImageReader configured.
    // We want to fail for the very first image because this case is too bad.
    int outputWidth = buffer->width;
    int outputHeight = buffer->height;

    // Correct width/height when crop is set.
    if (!buffer->crop.isEmpty()) {
        outputWidth = buffer->crop.getWidth();
        outputHeight = buffer->crop.getHeight();
    }

    int imageReaderWidth = ctx->getBufferWidth();
    int imageReaderHeight = ctx->getBufferHeight();
    if ((buffer->format != HAL_PIXEL_FORMAT_BLOB) &&
            (imageReaderWidth != outputWidth || imageReaderHeight > outputHeight)) {
        /**
         * For video decoder, the buffer height is actually the vertical stride,
         * which is always >= actual image height. For future, decoder need provide
         * right crop rectangle to CpuConsumer to indicate the actual image height,
         * see bug 9563986. After this bug is fixed, we can enforce the height equal
         * check. Right now, only make sure buffer height is no less than ImageReader
         * height.
         */
        jniThrowExceptionFmt(env, "java/lang/IllegalStateException",
                "Producer buffer size: %dx%d, doesn't match ImageReader configured size: %dx%d",
                outputWidth, outputHeight, imageReaderWidth, imageReaderHeight);
        return -1;
    }

    int imgReaderFmt = ctx->getBufferFormat();
    int bufFmt = buffer->format;
    if (imgReaderFmt != bufFmt) {
        // Special casing for when producer switches to a format compatible with flexible YUV
        // (HAL_PIXEL_FORMAT_YCbCr_420_888).
        if (imgReaderFmt == HAL_PIXEL_FORMAT_YCbCr_420_888 && (bufFmt ==
                HAL_PIXEL_FORMAT_YCrCb_420_SP || bufFmt == HAL_PIXEL_FORMAT_YV12)) {
            ctx->setBufferFormat(bufFmt);
            ALOGV("%s: Overriding buffer format YUV_420_888 to %x.", __FUNCTION__, bufFmt);
        } else {
            // Return the buffer to the queue.
            consumer->unlockBuffer(*buffer);
            ctx->returnLockedBuffer(buffer);

            // Throw exception
            ALOGE("Producer output buffer format: 0x%x, ImageReader configured format: 0x%x",
                    buffer->format, ctx->getBufferFormat());
            String8 msg;
            msg.appendFormat("The producer output buffer format 0x%x doesn't "
                    "match the ImageReader's configured buffer format 0x%x.",
                    buffer->format, ctx->getBufferFormat());
            jniThrowException(env, "java/lang/UnsupportedOperationException",
                    msg.string());
            return -1;
        }
    }
    // Set SurfaceImage instance member variables
    Image_setBuffer(env, image, buffer);
    env->SetLongField(image, gSurfaceImageClassInfo.mTimestamp,
            static_cast<jlong>(buffer->timestamp));

    return ACQUIRE_SUCCESS;
}

static jobject ImageReader_getSurface(JNIEnv* env, jobject thiz)
{
    ALOGV("%s: ", __FUNCTION__);

    IGraphicBufferProducer* gbp = ImageReader_getProducer(env, thiz);
    if (gbp == NULL) {
        jniThrowRuntimeException(env, "CpuConsumer is uninitialized");
        return NULL;
    }

    // Wrap the IGBP in a Java-language Surface.
    return android_view_Surface_createFromIGraphicBufferProducer(env, gbp);
}

static jobject Image_createSurfacePlane(JNIEnv* env, jobject thiz, int idx)
{
    int rowStride, pixelStride;
    ALOGV("%s: buffer index: %d", __FUNCTION__, idx);

    CpuConsumer::LockedBuffer* buffer = Image_getLockedBuffer(env, thiz);

    ALOG_ASSERT(buffer != NULL);
    if (buffer == NULL) {
        jniThrowException(env, "java/lang/IllegalStateException", "Image was released");
    }
    rowStride = Image_imageGetRowStride(env, buffer, idx);
    pixelStride = Image_imageGetPixelStride(env, buffer, idx);

    jobject surfPlaneObj = env->NewObject(gSurfacePlaneClassInfo.clazz,
            gSurfacePlaneClassInfo.ctor, thiz, idx, rowStride, pixelStride);

    return surfPlaneObj;
}

static jobject Image_getByteBuffer(JNIEnv* env, jobject thiz, int idx)
{
    uint8_t *base = NULL;
    uint32_t size = 0;
    jobject byteBuffer;

    ALOGV("%s: buffer index: %d", __FUNCTION__, idx);

    CpuConsumer::LockedBuffer* buffer = Image_getLockedBuffer(env, thiz);

    if (buffer == NULL) {
        jniThrowException(env, "java/lang/IllegalStateException", "Image was released");
    }

    // Create byteBuffer from native buffer
    Image_getLockedBufferInfo(env, buffer, idx, &base, &size);

    if (size > static_cast<uint32_t>(INT32_MAX)) {
        // Byte buffer have 'int capacity', so check the range
        jniThrowExceptionFmt(env, "java/lang/IllegalStateException",
                "Size too large for bytebuffer capacity " PRIu32, size);
        return NULL;
    }

    byteBuffer = env->NewDirectByteBuffer(base, size);
    // TODO: throw dvm exOutOfMemoryError?
    if ((byteBuffer == NULL) && (env->ExceptionCheck() == false)) {
        jniThrowException(env, "java/lang/IllegalStateException", "Failed to allocate ByteBuffer");
    }

    return byteBuffer;
}

} // extern "C"

// ----------------------------------------------------------------------------

static JNINativeMethod gImageReaderMethods[] = {
    {"nativeClassInit",        "()V",                        (void*)ImageReader_classInit },
    {"nativeInit",             "(Ljava/lang/Object;IIII)V",  (void*)ImageReader_init },
    {"nativeClose",            "()V",                        (void*)ImageReader_close },
    {"nativeReleaseImage",     "(Landroid/media/Image;)V",   (void*)ImageReader_imageRelease },
    {"nativeImageSetup",       "(Landroid/media/Image;)I",    (void*)ImageReader_imageSetup },
    {"nativeGetSurface",       "()Landroid/view/Surface;",   (void*)ImageReader_getSurface },
};

static JNINativeMethod gImageMethods[] = {
    {"nativeImageGetBuffer",   "(I)Ljava/nio/ByteBuffer;",   (void*)Image_getByteBuffer },
    {"nativeCreatePlane",      "(I)Landroid/media/ImageReader$SurfaceImage$SurfacePlane;",
                                                             (void*)Image_createSurfacePlane },
};

int register_android_media_ImageReader(JNIEnv *env) {

    int ret1 = AndroidRuntime::registerNativeMethods(env,
                   "android/media/ImageReader", gImageReaderMethods, NELEM(gImageReaderMethods));

    int ret2 = AndroidRuntime::registerNativeMethods(env,
                   "android/media/ImageReader$SurfaceImage", gImageMethods, NELEM(gImageMethods));

    return (ret1 || ret2);
}