那些遇到过的问题

在一次使用多个YuvImage时使用compresstojpeg时内存不足

vfr*_*chi 5 android image-processing yuv out-of-memory

我正在构建一个缓冲N个相机帧的应用程序,当用户点击一个按钮时,它会使用应用效果的所有已保存帧保存照片.

我正在保存照片并在AsyncTask上处理帧.当我执行它时,我从屏幕上删除所有内容,只留下一个TextView来显示保存照片的进度.

目前AsyncTask doInBackground看起来像这样:

protected Void doInBackground(Integer... params) 
{
    int w = mBuffer.get(0).getWidth();
    int h = mBuffer.get(0).getHeight();
    int lineHeight = h / mBuffer.size();
    int currentHeight = 0;

    Log.d("output", "saving photo "+w+", "+h);

    for (int i = 0; i < mBuffer.size(); i++)
    {
        YuvImage image = mBuffer.get(i);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        if (!image.compressToJpeg(new Rect(0, currentHeight, w, lineHeight), 50, out))
        {
            Log.d("output", "problem converting yuv to jpg");
            break;
        }

        currentHeight += lineHeight;

        Log.d("output", "currentHeight: "+currentHeight);

        publishProgress((int)((i / (float)mBuffer.size()) * 100));
        try
        {
            out.flush();
            out.close();
            out = null;
        }
        catch(Exception e)
        {

        }

        System.gc();

        try
        {
            Thread.sleep(200);
        }
        catch(Exception e)
        {

        }

        if (isCancelled())
        {
            break;
        }
    }
    return null;
}
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我已经为这个问题删除了许多不那么重要的代码部分,这只是提出OutOfMemory问题的部分.基本上我正在做的是从图像中获取一条线并将其压缩为JPEG.但它只能压缩第一张图像.当它转到第二个时,它会引发OutOfMemory异常.

的System.GC(),Thread.sleep(),out.flush(),out.close(),都是不成功的attemps来解决这个问题.

mBuffer的当前大小是5,最初它是32.从DDMS堆调试,它的堆大小是30MB,它分配9MB.显然,有很大的发展空间.如果我删除compressToJpeg()了的AsyncTask完成就好了.

有没有人有这个问题的解决方案？我应该尝试自己的YUV - > JPEG转换器吗？

使用最新代码编辑:

protected Void doInBackground(Integer... params) 
{
    int lineHeight = mHeight / mBufferSize;
    int currentHeight = 0;

    Log.d("output", "saving photo: "+mWidth+", "+mHeight);
    File outputPath = new File(Environment.getExternalStorageDirectory().getPath() + "/camerafluid-output");
    outputPath.mkdirs();
    for (int i = 0; i < mBufferSize; i++)
    {
        File imageFile = new File(mCachePath, "image-"+0);
        File outputFile = new File(outputPath, "image-"+0);

        if (!imageFile.exists())
        {
            Log.d("output", "image "+i+" not found on cache directory");
            continue;
        }

        try
        {
            int size = (int)imageFile.length();
            byte[] imageBytes = new byte[size];
            BufferedInputStream buf = new BufferedInputStream(new FileInputStream(imageFile));
            buf.read(imageBytes, 0, size);
            buf.close();

            YuvImage image = new YuvImage(imageBytes, ImageFormat.NV21, mWidth, mHeight, null);
            imageBytes = null;
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            if (!image.compressToJpeg(new Rect(0, currentHeight, mWidth, lineHeight), 50, out))
            {
                Log.d("output", "problem converting yuv to jpg");
                break;
            }

            FileOutputStream s = new FileOutputStream(outputFile);
            s.write(out.toByteArray());
            s.flush();
            s.close();
            s = null;

            currentHeight += lineHeight;
            Log.d("output", "currentHeight: "+currentHeight);

            publishProgress((int)((i / (float)mBufferSize) * 100));
            System.gc();
        }
        catch(Exception e)
        {

        }

        if (isCancelled())
        {
            break;
        }
    }
    return null;
}
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我正在保存图像,因为我可以看到缓存目录中保存的文件,这里是保存缓冲区并执行AsyncTask的Activity部分:

public void takePhoto()
{
    Log.d("output", "taking photo");

    //vfranchi - save the buffer on the disk to free memory
    File cachePath = new File(getExternalCacheDir().getPath() + "/buffer");
    if (!cachePath.exists())
    {
        Log.d("output", "cache path doesnt exist");
        cachePath.mkdirs();
    }

    int count = 0;
    int width = mPhotoBuffer.get(0).getWidth();
    int height = mPhotoBuffer.get(0).getHeight();
    int bufferSize = mPhotoBuffer.size();
    for(YuvImage i : mPhotoBuffer)
    {
        File f = new File(cachePath, "image-"+count);
        try
        {
            FileOutputStream s = new FileOutputStream(f);
            s.write(i.getYuvData());
            s.flush();
            s.close();
            Log.d("output", "saved image "+count);
            count++;
        }
        catch(Exception e)
        {
            Log.d("output", "unable to save image "+count+"\n"+e.getLocalizedMessage());
        }
    }

    mPhotoBuffer = null;
    System.gc();

    SavePhotoTask task = new SavePhotoTask(this, cachePath, width, height, bufferSize);
    task.execute(0);
}
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Logcat以拍照方式开始:

03-30 12:48:08.534: D/output(15359): taking photo
03-30 12:48:09.011: V/Camera-JNI(15359): setHasPreviewCallback: installed:0, manualBuffer:0
03-30 12:48:09.011: V/Camera-JNI(15359): get_native_camera: context=0x138520, camera=0x1eea78
03-30 12:48:09.011: V/Camera-JNI(15359): Clearing callback buffers, 0 remained
03-30 12:48:09.011: V/Camera-JNI(15359): stopPreview
03-30 12:48:09.011: V/Camera-JNI(15359): get_native_camera: context=0x138520, camera=0x1eea78
03-30 12:48:15.323: D/output(15359): saved image 0
03-30 12:48:16.628: D/output(15359): saved image 1
03-30 12:48:17.880: D/output(15359): saved image 2
03-30 12:48:19.073: D/output(15359): saved image 3
03-30 12:48:20.545: D/output(15359): saved image 4
03-30 12:48:28.089: D/output(15359): saving photo: 848, 480
03-30 12:48:33.276: D/skia(15359): onFlyCompress
03-30 12:48:35.020: D/output(15359): currentHeight: 96
03-30 12:48:44.144: D/output(15359): currentHeight: 192
03-30 12:48:52.581: D/skia(15359): onFlyCompress
03-30 12:48:52.878: I/dalvikvm-heap(15359): Grow heap (frag case) to 14.975MB for 2095120-byte allocation
03-30 12:48:53.112: I/dalvikvm-heap(15359): Grow heap (frag case) to 17.975MB for 4192272-byte allocation
03-30 12:48:53.566: I/dalvikvm-heap(15359): Grow heap (frag case) to 23.975MB for 8386576-byte allocation
03-30 12:48:54.855: I/dalvikvm-heap(15359): Grow heap (frag case) to 35.975MB for 16775184-byte allocation
03-30 12:48:56.620: I/dalvikvm-heap(15359): Forcing collection of SoftReferences for 33552400-byte allocation
03-30 12:48:56.644: E/dalvikvm-heap(15359): Out of memory on a 33552400-byte allocation.
03-30 12:48:56.644: I/dalvikvm(15359): "AsyncTask #1" prio=5 tid=12 RUNNABLE
03-30 12:48:56.644: I/dalvikvm(15359):   | group="main" sCount=0 dsCount=0 obj=0x40d71628 self=0x22eea8
03-30 12:48:56.644: I/dalvikvm(15359):   | sysTid=15404 nice=10 sched=0/0 cgrp=bg_non_interactive handle=2056240
03-30 12:48:56.651: I/dalvikvm(15359):   | schedstat=( 3387725830 799926751 876 ) utm=327 stm=10 core=0
03-30 12:48:56.651: I/dalvikvm(15359):   at java.io.ByteArrayOutputStream.expand(ByteArrayOutputStream.java:~91)
03-30 12:48:56.651: I/dalvikvm(15359):   at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:201)
03-30 12:48:56.651: I/dalvikvm(15359):   at android.graphics.YuvImage.nativeCompressToJpeg(Native Method)
03-30 12:48:56.667: I/dalvikvm(15359):   at android.graphics.YuvImage.compressToJpeg(YuvImage.java:141)
03-30 12:48:56.667: I/dalvikvm(15359):   at com.vfranchi.camerafluid.SavePhotoTask.doInBackground(SavePhotoTask.java:78)
03-30 12:48:56.667: I/dalvikvm(15359):   at com.vfranchi.camerafluid.SavePhotoTask.doInBackground(SavePhotoTask.java:1)
03-30 12:48:56.667: I/dalvikvm(15359):   at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-30 12:48:56.667: I/dalvikvm(15359):   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-30 12:48:56.667: I/dalvikvm(15359):   at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-30 12:48:56.667: I/dalvikvm(15359):   at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-30 12:48:56.667: I/dalvikvm(15359):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-30 12:48:56.667: I/dalvikvm(15359):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-30 12:48:56.667: I/dalvikvm(15359):   at java.lang.Thread.run(Thread.java:856)
03-30 12:48:56.683: W/System.err(15359): java.lang.OutOfMemoryError
03-30 12:48:56.683: W/System.err(15359):    at java.io.ByteArrayOutputStream.expand(ByteArrayOutputStream.java:91)
03-30 12:48:56.683: W/System.err(15359):    at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:201)
03-30 12:48:56.691: W/System.err(15359):    at android.graphics.YuvImage.nativeCompressToJpeg(Native Method)
03-30 12:48:56.691: W/System.err(15359):    at android.graphics.YuvImage.compressToJpeg(YuvImage.java:141)
03-30 12:48:56.691: W/System.err(15359):    at com.vfranchi.camerafluid.SavePhotoTask.doInBackground(SavePhotoTask.java:78)
03-30 12:48:56.691: W/System.err(15359):    at com.vfranchi.camerafluid.SavePhotoTask.doInBackground(SavePhotoTask.java:1)
03-30 12:48:56.691: W/System.err(15359):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-30 12:48:56.698: W/System.err(15359):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-30 12:48:56.698: W/System.err(15359):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-30 12:48:56.698: W/System.err(15359):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-30 12:48:56.698: W/System.err(15359):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-30 12:48:56.698: W/System.err(15359):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-30 12:48:56.706: W/System.err(15359):    at java.lang.Thread.run(Thread.java:856)
03-30 12:48:56.706: D/skia(15359): ------- write threw an exception
03-30 12:49:15.181: W/jdwp(15359): Debugger is telling the VM to exit with code=1
03-30 12:49:15.181: I/dalvikvm(15359): GC lifetime allocation: 5 bytes
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YuvImage缓冲区是在onPreviewFrame上创建的,如下所示:

public void onPreviewFrame(byte[] data, Camera camera) 
{
    Camera.Parameters parameters = camera.getParameters();
    Camera.Size size = parameters.getPreviewSize();

    // Generate a YuvImage from the camera data
    int w = size.width;
    int h = size.height;
    YuvImage photoImage = new YuvImage(data, parameters.getPreviewFormat(), w, h, null);
    mPhotoBuffer.add(0, photoImage);

    if (mPhotoBuffer.size() > mBufferSize)
    {
        mPhotoBuffer.remove(mPhotoBuffer.size() - 1);
    }
}
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vfr*_*chi 5

我设法找到解决问题的方法，这是通过不使用YuvImage类。我猜该compressToJpeg()方法出了点问题，至少在我不知道的设备上。

这是我的doInBackground方法的最终代码：

protected Void doInBackground(Integer... params) 
{
    int lineHeight = mHeight / mBufferSize;
    int currentHeight = 0;

    Bitmap result = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(result);

    Log.d("output", "saving photo: "+mWidth+", "+mHeight);
    File outputPath = new File(Environment.getExternalStorageDirectory().getPath() + "/camerafluid-output");
    outputPath.mkdirs();
    for (int i = 0; i < mBufferSize; i++)
    {
        File imageFile = new File(mCachePath, "image-"+i);
        File outputFile = new File(outputPath, "image-"+i+".jpg");

        if (!imageFile.exists())
        {
            Log.d("output", "image "+i+" not found on cache directory");
            continue;
        }

        try
        {
            int size = (int)imageFile.length();
            byte[] imageBytes = new byte[size];
            BufferedInputStream buf = new BufferedInputStream(new FileInputStream(imageFile));
            buf.read(imageBytes, 0, size);
            buf.close();

            int[] imagePixels = MainActivity.convertYUV420_NV21toRGB8888(imageBytes, mWidth, mHeight);
            imageBytes = null;
            Bitmap bitmapImage = Bitmap.createBitmap(imagePixels, mWidth, mHeight, Bitmap.Config.ARGB_8888);
            imagePixels = null;
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            if (!bitmapImage.compress(CompressFormat.JPEG, 50, out))
            {
                Log.d("output", "problem converting yuv to jpg");
                break;
            }

            FileOutputStream s = new FileOutputStream(outputFile);
            s.write(out.toByteArray());
            s.flush();
            s.close();
            s = null;

            currentHeight += lineHeight;
            Log.d("output", "currentHeight: "+currentHeight);

            publishProgress((int)((i / (float)mBufferSize) * 100));
            System.gc();
        }
        catch(Exception e)
        {

        }

        if (isCancelled())
        {
            break;
        }

    }

    return null;
}
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该方法是将Yuv数据转换为RGB并创建一个位图，以便我可以压缩为JPEG并保存到外部存储中。这仅用于测试目的，因此，没有Signal错误11或OutOfMemory异常。我已经尝试使用40张图像的缓冲区。

在这里找到YUV-> RGB转换器，在Android中显示YUV图像。而且我使用minhaz想法在处理图像之前将缓冲区缓存在磁盘上，以避免占用大量内存。

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