问题
I am building an app that buffers N camera frames and when the user taps a button it saves the photo using all the saved frames applying an effect.
I am saving the photo and processing the frames on an AsyncTask. When I execute it, I remove everything from the screen and leave only a TextView to display the progress of saving the photo.
Currently the AsyncTask doInBackground looks like this:
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;
}
I've already removed a lot of not-so-important parts of code for this issue and this is only the part that is raising OutOfMemory issue. Basically what I'm doing there is getting a line from the image and compressing it to JPEG. But it only manages to compress the first image. When it goes to the second one, it raises an OutOfMemory exception.
The System.GC(), Thread.sleep(), out.flush(), out.close(), are all unsuccessful attemps to fix the problem.
The currently size of mBuffer is 5, initially it was 32. From the DDMS Heap debug, its Heap Size is 30MB and it is allocating 9MB. Apparently there is a lot of room to grow. If I remove the compressToJpeg() the AsyncTask completes just fine.
Does anyone have a solution for this problem? Should I try my own YUV -> JPEG converter?
EDIT with most recent code:
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;
}
I am saving the images correctly as I can see the saved files on the cache directory, here is the Activity part which saves the buffer and executes the AsyncTask:
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 beggining at the taking photo method:
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
The YuvImage buffer is created on the onPreviewFrame which is shown below:
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);
}
}
回答1:
I managed to find a solution for my problem, and it was by not using YuvImage class. I guess something is wrong with the compressToJpeg() method, at least on my device I don't know.
Here is the final code for my doInBackground method:
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;
}
The method is converting the Yuv data to RGB and creating a bitmap so I can compress to JPEG and save to the external storage. This was only for testing purposes, and this way, there is no Signal error 11 or an OutOfMemory exception. I already tried with a buffer of 40 images.
The YUV -> RGB converter was found here Displaying YUV Image in Android. And I'm using minhaz idea to cache the buffer on disk before processing the images to avoid high memory usage.
来源：https://stackoverflow.com/questions/15696165/out-of-memory-when-using-compresstojpeg-on-multiple-yuvimage-one-at-a-time