android – 一次在多个YuvImage上使用compresstojpeg时内存不足

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;
}

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.

System.GC(),Thread.sleep(),out.flush(),out.close()都是尝试解决问题的不成功的尝试.

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.如果我删除了compressToJpeg(),AsyncTask就完成了.

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？

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,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,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;
}

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);
}

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

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(),h,null);
    mPhotoBuffer.add(0,photoImage);

    if (mPhotoBuffer.size() > mBufferSize)
    {
        mPhotoBuffer.remove(mPhotoBuffer.size() - 1);
    }
}

最佳答案

我设法为我的问题找到了解决方案,而不是使用YuvImage类.我想compressToJpeg()方法有问题,至少在我的设备上我不知道.

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

    Log.d("output","image-"+i);
        File outputFile = new File(outputPath,"image-"+i+".jpg");

        if (!imageFile.exists())
        {
            Log.d("output",size);
            buf.close();

            int[] imagePixels = MainActivity.convertYUV420_NV21toRGB8888(imageBytes,mHeight);
            imageBytes = null;
            Bitmap bitmapImage = Bitmap.createBitmap(imagePixels,Bitmap.Config.ARGB_8888);
            imagePixels = null;
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            if (!bitmapImage.compress(CompressFormat.JPEG,"currentHeight: "+currentHeight);

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

        }

        if (isCancelled())
        {
            break;
        }

    }

    return null;
}

该方法是将Yuv数据转换为RGB并创建位图,以便我可以压缩为JPEG并保存到外部存储器.这仅用于测试目的,这样就没有Signal错误11或OutOfMemory异常.我已经尝试过40个图像的缓冲区.

YUV – >在这里找到了RGB转换器Displaying YUV Image in Android.我正在使用minhaz的想法在处理图像之前缓存磁盘上的缓冲区以避免高内存使用.

原文链接：https://www.f2er.com/android/430827.html

android – 一次在多个YuvImage上使用compresstojpeg时内存不足

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