Working implementation of MediaCodecVideoRecorder

cameraview/build.gradle

@@ -35,6 +35,7 @@ android {
         main.java.srcDirs += 'src/main/options'
         main.java.srcDirs += 'src/main/views'
         main.java.srcDirs += 'src/main/utils'
+        main.java.srcDirs += 'src/main/gles'
     }
 }
 

cameraview/src/androidTest/java/com/otaliastudios/cameraview/MockCameraController.java

@@ -99,6 +99,11 @@ public class MockCameraController extends CameraController {
     void takeVideo(@NonNull File file) {
     }
 
+    @Override
+    void takeVideoSnapshot(@NonNull File file) {
+
+    }
+
     @Override
     void stopVideo() {
     }
@@ -116,6 +121,11 @@ public class MockCameraController extends CameraController {
     public void onSurfaceAvailable() {
     }
 
+    @Override
+    public void onSurfaceDestroyed() {
+
+    }
+
     @Override
     public void onBufferAvailable(byte[] buffer) {
     }

cameraview/src/androidTest/java/com/otaliastudios/cameraview/VideoRecorderTest.java

@@ -25,6 +25,7 @@ public class VideoRecorderTest extends BaseTest {
         VideoRecorder.VideoResultListener listener = Mockito.mock(VideoRecorder.VideoResultListener.class);
         VideoRecorder recorder = new VideoRecorder(result, listener) {
             void start() {}
+            void stop() { }
         };
         recorder.start();
         recorder.stop();

cameraview/src/main/gles/com/otaliastudios/cameraview/EglBaseSurface.java

@@ -0,0 +1,200 @@
+/*
+ * Copyright 2013 Google Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+package com.otaliastudios.cameraview;
+
+import android.graphics.Bitmap;
+import android.opengl.EGL14;
+import android.opengl.EGLSurface;
+import android.opengl.GLES20;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.util.Log;
+
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * Common base class for EGL surfaces.
+ * <p>
+ * There can be multiple surfaces associated with a single context.
+ */
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+class EglBaseSurface extends EglElement {
+    protected static final String TAG = EglBaseSurface.class.getSimpleName();
+
+    // EglCore object we're associated with.  It may be associated with multiple surfaces.
+    protected EglCore mEglCore;
+
+    private EGLSurface mEGLSurface = EGL14.EGL_NO_SURFACE;
+    private int mWidth = -1;
+    private int mHeight = -1;
+
+    protected EglBaseSurface(EglCore eglCore) {
+        mEglCore = eglCore;
+    }
+
+    /**
+     * Creates a window surface.
+     * <p>
+     * @param surface May be a Surface or SurfaceTexture.
+     */
+    public void createWindowSurface(Object surface) {
+        if (mEGLSurface != EGL14.EGL_NO_SURFACE) {
+            throw new IllegalStateException("surface already created");
+        }
+        mEGLSurface = mEglCore.createWindowSurface(surface);
+
+        // Don't cache width/height here, because the size of the underlying surface can change
+        // out from under us (see e.g. HardwareScalerActivity).
+        //mWidth = mEglCore.querySurface(mEGLSurface, EGL14.EGL_WIDTH);
+        //mHeight = mEglCore.querySurface(mEGLSurface, EGL14.EGL_HEIGHT);
+    }
+
+    /**
+     * Creates an off-screen surface.
+     */
+    public void createOffscreenSurface(int width, int height) {
+        if (mEGLSurface != EGL14.EGL_NO_SURFACE) {
+            throw new IllegalStateException("surface already created");
+        }
+        mEGLSurface = mEglCore.createOffscreenSurface(width, height);
+        mWidth = width;
+        mHeight = height;
+    }
+
+    /**
+     * Returns the surface's width, in pixels.
+     * <p>
+     * If this is called on a window surface, and the underlying surface is in the process
+     * of changing size, we may not see the new size right away (e.g. in the "surfaceChanged"
+     * callback).  The size should match after the next buffer swap.
+     */
+    public int getWidth() {
+        if (mWidth < 0) {
+            return mEglCore.querySurface(mEGLSurface, EGL14.EGL_WIDTH);
+        } else {
+            return mWidth;
+        }
+    }
+
+    /**
+     * Returns the surface's height, in pixels.
+     */
+    public int getHeight() {
+        if (mHeight < 0) {
+            return mEglCore.querySurface(mEGLSurface, EGL14.EGL_HEIGHT);
+        } else {
+            return mHeight;
+        }
+    }
+
+    /**
+     * Release the EGL surface.
+     */
+    public void releaseEglSurface() {
+        mEglCore.releaseSurface(mEGLSurface);
+        mEGLSurface = EGL14.EGL_NO_SURFACE;
+        mWidth = mHeight = -1;
+    }
+
+    /**
+     * Makes our EGL context and surface current.
+     */
+    public void makeCurrent() {
+        mEglCore.makeCurrent(mEGLSurface);
+    }
+
+    /**
+     * Makes our EGL context and surface current for drawing, using the supplied surface
+     * for reading.
+     */
+    public void makeCurrentReadFrom(EglBaseSurface readSurface) {
+        mEglCore.makeCurrent(mEGLSurface, readSurface.mEGLSurface);
+    }
+
+    /**
+     * Calls eglSwapBuffers.  Use this to "publish" the current frame.
+     *
+     * @return false on failure
+     */
+    public boolean swapBuffers() {
+        boolean result = mEglCore.swapBuffers(mEGLSurface);
+        if (!result) {
+            Log.d(TAG, "WARNING: swapBuffers() failed");
+        }
+        return result;
+    }
+
+    /**
+     * Sends the presentation time stamp to EGL.
+     *
+     * @param nsecs Timestamp, in nanoseconds.
+     */
+    public void setPresentationTime(long nsecs) {
+        mEglCore.setPresentationTime(mEGLSurface, nsecs);
+    }
+
+    /**
+     * Saves the EGL surface to a file.
+     * <p>
+     * Expects that this object's EGL surface is current.
+     */
+    public void saveFrame(File file) throws IOException {
+        if (!mEglCore.isCurrent(mEGLSurface)) {
+            throw new RuntimeException("Expected EGL context/surface is not current");
+        }
+
+        // glReadPixels fills in a "direct" ByteBuffer with what is essentially big-endian RGBA
+        // data (i.e. a byte of red, followed by a byte of green...).  While the Bitmap
+        // constructor that takes an int[] wants little-endian ARGB (blue/red swapped), the
+        // Bitmap "copy pixels" method wants the same format GL provides.
+        //
+        // Ideally we'd have some way to re-use the ByteBuffer, especially if we're calling
+        // here often.
+        //
+        // Making this even more interesting is the upside-down nature of GL, which means
+        // our output will look upside down relative to what appears on screen if the
+        // typical GL conventions are used.
+
+        String filename = file.toString();
+
+        int width = getWidth();
+        int height = getHeight();
+        ByteBuffer buf = ByteBuffer.allocateDirect(width * height * 4);
+        buf.order(ByteOrder.LITTLE_ENDIAN);
+        GLES20.glReadPixels(0, 0, width, height,
+                GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buf);
+        check("glReadPixels");
+        buf.rewind();
+
+        BufferedOutputStream bos = null;
+        try {
+            bos = new BufferedOutputStream(new FileOutputStream(filename));
+            Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+            bmp.copyPixelsFromBuffer(buf);
+            bmp.compress(Bitmap.CompressFormat.PNG, 90, bos);
+            bmp.recycle();
+        } finally {
+            if (bos != null) bos.close();
+        }
+        Log.d(TAG, "Saved " + width + "x" + height + " frame as '" + filename + "'");
+    }
+}

cameraview/src/main/gles/com/otaliastudios/cameraview/EglCore.java

@@ -0,0 +1,377 @@
+/*
+ * Copyright 2013 Google Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+package com.otaliastudios.cameraview;
+
+import android.graphics.SurfaceTexture;
+import android.opengl.EGL14;
+import android.opengl.EGLConfig;
+import android.opengl.EGLContext;
+import android.opengl.EGLDisplay;
+import android.opengl.EGLExt;
+import android.opengl.EGLSurface;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.util.Log;
+import android.view.Surface;
+
+/**
+ * -- from grafika --
+ *
+ * Core EGL state (display, context, config).
+ * <p>
+ * The EGLContext must only be attached to one thread at a time.  This class is not thread-safe.
+ */
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+final class EglCore {
+    private static final String TAG = EglCore.class.getSimpleName();
+
+    /**
+     * Constructor flag: surface must be recordable.  This discourages EGL from using a
+     * pixel format that cannot be converted efficiently to something usable by the video
+     * encoder.
+     */
+    public static final int FLAG_RECORDABLE = 0x01;
+
+    /**
+     * Constructor flag: ask for GLES3, fall back to GLES2 if not available.  Without this
+     * flag, GLES2 is used.
+     */
+    public static final int FLAG_TRY_GLES3 = 0x02;
+
+    // Android-specific extension.
+    private static final int EGL_RECORDABLE_ANDROID = 0x3142;
+
+    private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;
+    private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;
+    private EGLConfig mEGLConfig = null;
+    private int mGlVersion = -1;
+
+
+    /**
+     * Prepares EGL display and context.
+     * <p>
+     * Equivalent to EglCore(null, 0).
+     */
+    public EglCore() {
+        this(null, 0);
+    }
+
+    /**
+     * Prepares EGL display and context.
+     * <p>
+     * @param sharedContext The context to share, or null if sharing is not desired.
+     * @param flags Configuration bit flags, e.g. FLAG_RECORDABLE.
+     */
+    public EglCore(EGLContext sharedContext, int flags) {
+        if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
+            throw new RuntimeException("EGL already set up");
+        }
+
+        if (sharedContext == null) {
+            sharedContext = EGL14.EGL_NO_CONTEXT;
+        }
+
+        mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+        if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
+            throw new RuntimeException("unable to get EGL14 display");
+        }
+        int[] version = new int[2];
+        if (!EGL14.eglInitialize(mEGLDisplay, version, 0, version, 1)) {
+            mEGLDisplay = null;
+            throw new RuntimeException("unable to initialize EGL14");
+        }
+
+        // Try to get a GLES3 context, if requested.
+        if ((flags & FLAG_TRY_GLES3) != 0) {
+            //Log.d(TAG, "Trying GLES 3");
+            EGLConfig config = getConfig(flags, 3);
+            if (config != null) {
+                int[] attrib3_list = {
+                        EGL14.EGL_CONTEXT_CLIENT_VERSION, 3,
+                        EGL14.EGL_NONE
+                };
+                EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext,
+                        attrib3_list, 0);
+
+                if (EGL14.eglGetError() == EGL14.EGL_SUCCESS) {
+                    //Log.d(TAG, "Got GLES 3 config");
+                    mEGLConfig = config;
+                    mEGLContext = context;
+                    mGlVersion = 3;
+                }
+            }
+        }
+        if (mEGLContext == EGL14.EGL_NO_CONTEXT) {  // GLES 2 only, or GLES 3 attempt failed
+            //Log.d(TAG, "Trying GLES 2");
+            EGLConfig config = getConfig(flags, 2);
+            if (config == null) {
+                throw new RuntimeException("Unable to find a suitable EGLConfig");
+            }
+            int[] attrib2_list = {
+                    EGL14.EGL_CONTEXT_CLIENT_VERSION, 2,
+                    EGL14.EGL_NONE
+            };
+            EGLContext context = EGL14.eglCreateContext(mEGLDisplay, config, sharedContext,
+                    attrib2_list, 0);
+            checkEglError("eglCreateContext");
+            mEGLConfig = config;
+            mEGLContext = context;
+            mGlVersion = 2;
+        }
+
+        // Confirm with query.
+        int[] values = new int[1];
+        EGL14.eglQueryContext(mEGLDisplay, mEGLContext, EGL14.EGL_CONTEXT_CLIENT_VERSION,
+                values, 0);
+        Log.d(TAG, "EGLContext created, client version " + values[0]);
+    }
+
+    /**
+     * Finds a suitable EGLConfig.
+     *
+     * @param flags Bit flags from constructor.
+     * @param version Must be 2 or 3.
+     */
+    private EGLConfig getConfig(int flags, int version) {
+        int renderableType = EGL14.EGL_OPENGL_ES2_BIT;
+        if (version >= 3) {
+            renderableType |= EGLExt.EGL_OPENGL_ES3_BIT_KHR;
+        }
+
+        // The actual surface is generally RGBA or RGBX, so situationally omitting alpha
+        // doesn't really help.  It can also lead to a huge performance hit on glReadPixels()
+        // when reading into a GL_RGBA buffer.
+        int[] attribList = {
+                EGL14.EGL_RED_SIZE, 8,
+                EGL14.EGL_GREEN_SIZE, 8,
+                EGL14.EGL_BLUE_SIZE, 8,
+                EGL14.EGL_ALPHA_SIZE, 8,
+                //EGL14.EGL_DEPTH_SIZE, 16,
+                //EGL14.EGL_STENCIL_SIZE, 8,
+                EGL14.EGL_RENDERABLE_TYPE, renderableType,
+                EGL14.EGL_NONE, 0,      // placeholder for recordable [@-3]
+                EGL14.EGL_NONE
+        };
+        if ((flags & FLAG_RECORDABLE) != 0) {
+            attribList[attribList.length - 3] = EGL_RECORDABLE_ANDROID;
+            attribList[attribList.length - 2] = 1;
+        }
+        EGLConfig[] configs = new EGLConfig[1];
+        int[] numConfigs = new int[1];
+        if (!EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0, configs.length,
+                numConfigs, 0)) {
+            Log.w(TAG, "unable to find RGB8888 / " + version + " EGLConfig");
+            return null;
+        }
+        return configs[0];
+    }
+
+    /**
+     * Discards all resources held by this class, notably the EGL context.  This must be
+     * called from the thread where the context was created.
+     * <p>
+     * On completion, no context will be current.
+     */
+    public void release() {
+        if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
+            // Android is unusual in that it uses a reference-counted EGLDisplay.  So for
+            // every eglInitialize() we need an eglTerminate().
+            EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
+                    EGL14.EGL_NO_CONTEXT);
+            EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
+            EGL14.eglReleaseThread();
+            EGL14.eglTerminate(mEGLDisplay);
+        }
+
+        mEGLDisplay = EGL14.EGL_NO_DISPLAY;
+        mEGLContext = EGL14.EGL_NO_CONTEXT;
+        mEGLConfig = null;
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        try {
+            if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
+                // We're limited here -- finalizers don't run on the thread that holds
+                // the EGL state, so if a surface or context is still current on another
+                // thread we can't fully release it here.  Exceptions thrown from here
+                // are quietly discarded.  Complain in the log file.
+                Log.w(TAG, "WARNING: EglCore was not explicitly released -- state may be leaked");
+                release();
+            }
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /**
+     * Destroys the specified surface.  Note the EGLSurface won't actually be destroyed if it's
+     * still current in a context.
+     */
+    public void releaseSurface(EGLSurface eglSurface) {
+        EGL14.eglDestroySurface(mEGLDisplay, eglSurface);
+    }
+
+    /**
+     * Creates an EGL surface associated with a Surface.
+     * <p>
+     * If this is destined for MediaCodec, the EGLConfig should have the "recordable" attribute.
+     */
+    public EGLSurface createWindowSurface(Object surface) {
+        if (!(surface instanceof Surface) && !(surface instanceof SurfaceTexture)) {
+            throw new RuntimeException("invalid surface: " + surface);
+        }
+
+        // Create a window surface, and attach it to the Surface we received.
+        int[] surfaceAttribs = {
+                EGL14.EGL_NONE
+        };
+        EGLSurface eglSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, surface,
+                surfaceAttribs, 0);
+        checkEglError("eglCreateWindowSurface");
+        if (eglSurface == null) {
+            throw new RuntimeException("surface was null");
+        }
+        return eglSurface;
+    }
+
+    /**
+     * Creates an EGL surface associated with an offscreen buffer.
+     */
+    public EGLSurface createOffscreenSurface(int width, int height) {
+        int[] surfaceAttribs = {
+                EGL14.EGL_WIDTH, width,
+                EGL14.EGL_HEIGHT, height,
+                EGL14.EGL_NONE
+        };
+        EGLSurface eglSurface = EGL14.eglCreatePbufferSurface(mEGLDisplay, mEGLConfig,
+                surfaceAttribs, 0);
+        checkEglError("eglCreatePbufferSurface");
+        if (eglSurface == null) {
+            throw new RuntimeException("surface was null");
+        }
+        return eglSurface;
+    }
+
+    /**
+     * Makes our EGL context current, using the supplied surface for both "draw" and "read".
+     */
+    public void makeCurrent(EGLSurface eglSurface) {
+        if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
+            // called makeCurrent() before create?
+            Log.d(TAG, "NOTE: makeCurrent w/o display");
+        }
+        if (!EGL14.eglMakeCurrent(mEGLDisplay, eglSurface, eglSurface, mEGLContext)) {
+            throw new RuntimeException("eglMakeCurrent failed");
+        }
+    }
+
+    /**
+     * Makes our EGL context current, using the supplied "draw" and "read" surfaces.
+     */
+    public void makeCurrent(EGLSurface drawSurface, EGLSurface readSurface) {
+        if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
+            // called makeCurrent() before create?
+            Log.d(TAG, "NOTE: makeCurrent w/o display");
+        }
+        if (!EGL14.eglMakeCurrent(mEGLDisplay, drawSurface, readSurface, mEGLContext)) {
+            throw new RuntimeException("eglMakeCurrent(draw,read) failed");
+        }
+    }
+
+    /**
+     * Makes no context current.
+     */
+    public void makeNothingCurrent() {
+        if (!EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
+                EGL14.EGL_NO_CONTEXT)) {
+            throw new RuntimeException("eglMakeCurrent failed");
+        }
+    }
+
+    /**
+     * Calls eglSwapBuffers.  Use this to "publish" the current frame.
+     *
+     * @return false on failure
+     */
+    public boolean swapBuffers(EGLSurface eglSurface) {
+        return EGL14.eglSwapBuffers(mEGLDisplay, eglSurface);
+    }
+
+    /**
+     * Sends the presentation time stamp to EGL.  Time is expressed in nanoseconds.
+     */
+    public void setPresentationTime(EGLSurface eglSurface, long nsecs) {
+        EGLExt.eglPresentationTimeANDROID(mEGLDisplay, eglSurface, nsecs);
+    }
+
+    /**
+     * Returns true if our context and the specified surface are current.
+     */
+    public boolean isCurrent(EGLSurface eglSurface) {
+        return mEGLContext.equals(EGL14.eglGetCurrentContext()) &&
+            eglSurface.equals(EGL14.eglGetCurrentSurface(EGL14.EGL_DRAW));
+    }
+
+    /**
+     * Performs a simple surface query.
+     */
+    public int querySurface(EGLSurface eglSurface, int what) {
+        int[] value = new int[1];
+        EGL14.eglQuerySurface(mEGLDisplay, eglSurface, what, value, 0);
+        return value[0];
+    }
+
+    /**
+     * Queries a string value.
+     */
+    public String queryString(int what) {
+        return EGL14.eglQueryString(mEGLDisplay, what);
+    }
+
+    /**
+     * Returns the GLES version this context is configured for (currently 2 or 3).
+     */
+    public int getGlVersion() {
+        return mGlVersion;
+    }
+
+    /**
+     * Writes the current display, context, and surface to the log.
+     */
+    public static void logCurrent(String msg) {
+        EGLDisplay display;
+        EGLContext context;
+        EGLSurface surface;
+
+        display = EGL14.eglGetCurrentDisplay();
+        context = EGL14.eglGetCurrentContext();
+        surface = EGL14.eglGetCurrentSurface(EGL14.EGL_DRAW);
+        Log.i(TAG, "Current EGL (" + msg + "): display=" + display + ", context=" + context +
+                ", surface=" + surface);
+    }
+
+    /**
+     * Checks for EGL errors.  Throws an exception if an error has been raised.
+     */
+    private void checkEglError(String msg) {
+        int error;
+        if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
+            throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));
+        }
+    }
+}

cameraview/src/main/gles/com/otaliastudios/cameraview/EglElement.java

@@ -1,7 +1,6 @@
 package com.otaliastudios.cameraview;
 
 
-import android.opengl.GLES11Ext;
 import android.opengl.GLES20;
 import android.opengl.Matrix;
 
@@ -9,9 +8,9 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 
-class GLElement {
+class EglElement {
 
-    private final static CameraLogger LOG = CameraLogger.create(GLElement.class.getSimpleName());
+    private final static CameraLogger LOG = CameraLogger.create(EglElement.class.getSimpleName());
 
     // Identity matrix for general use.
     protected static final float[] IDENTITY_MATRIX = new float[16];

cameraview/src/main/gles/com/otaliastudios/cameraview/EglViewport.java

@@ -3,14 +3,15 @@ package com.otaliastudios.cameraview;
 
 import android.opengl.GLES11Ext;
 import android.opengl.GLES20;
-import android.opengl.Matrix;
-import android.util.Log;
 
 import java.nio.FloatBuffer;
 
-class GLViewport extends GLElement {
+/**
+ * This is a mix of 3 grafika classes, FullFrameRect, Texture2dProgram, Drawable2d.
+ */
+class EglViewport extends EglElement {
 
-    private final static CameraLogger LOG = CameraLogger.create(GLViewport.class.getSimpleName());
+    private final static CameraLogger LOG = CameraLogger.create(EglViewport.class.getSimpleName());
 
     // Simple vertex shader.
     private static final String SIMPLE_VERTEX_SHADER =
@@ -74,7 +75,7 @@ class GLViewport extends GLElement {
     // private int muTexOffsetLoc; // Used for filtering
     // private int muColorAdjustLoc; // Used for filtering
 
-    GLViewport() {
+    EglViewport() {
         mTextureTarget = GLES11Ext.GL_TEXTURE_EXTERNAL_OES;
         mProgramHandle = createProgram(SIMPLE_VERTEX_SHADER, SIMPLE_FRAGMENT_SHADER);
         maPositionLoc = GLES20.glGetAttribLocation(mProgramHandle, "aPosition");
@@ -90,10 +91,13 @@ class GLViewport extends GLElement {
 
     }
 
+    void release(boolean doEglCleanup) {
+        if (doEglCleanup) GLES20.glDeleteProgram(mProgramHandle);
+        mProgramHandle = -1;
+    }
 
     void release() {
-        GLES20.glDeleteProgram(mProgramHandle);
-        mProgramHandle = -1;
+        release(true);
     }
 
     int createTexture() {

cameraview/src/main/gles/com/otaliastudios/cameraview/EglWindowSurface.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2013 Google Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+package com.otaliastudios.cameraview;
+
+import android.graphics.SurfaceTexture;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.view.Surface;
+
+/**
+ * Recordable EGL window surface.
+ * <p>
+ * It's good practice to explicitly release() the surface, preferably from a "finally" block.
+ */
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+class EglWindowSurface extends EglBaseSurface {
+    private Surface mSurface;
+    private boolean mReleaseSurface;
+
+    /**
+     * Associates an EGL surface with the native window surface.
+     * <p>
+     * Set releaseSurface to true if you want the Surface to be released when release() is
+     * called.  This is convenient, but can interfere with framework classes that expect to
+     * manage the Surface themselves (e.g. if you release a SurfaceView's Surface, the
+     * surfaceDestroyed() callback won't fire).
+     */
+    public EglWindowSurface(EglCore eglCore, Surface surface, boolean releaseSurface) {
+        super(eglCore);
+        createWindowSurface(surface);
+        mSurface = surface;
+        mReleaseSurface = releaseSurface;
+    }
+
+    /**
+     * Associates an EGL surface with the SurfaceTexture.
+     */
+    public EglWindowSurface(EglCore eglCore, SurfaceTexture surfaceTexture) {
+        super(eglCore);
+        createWindowSurface(surfaceTexture);
+    }
+
+    /**
+     * Releases any resources associated with the EGL surface (and, if configured to do so,
+     * with the Surface as well).
+     * <p>
+     * Does not require that the surface's EGL context be current.
+     */
+    public void release() {
+        releaseEglSurface();
+        if (mSurface != null) {
+            if (mReleaseSurface) {
+                mSurface.release();
+            }
+            mSurface = null;
+        }
+    }
+
+    /**
+     * Recreate the EGLSurface, using the new EglBase.  The caller should have already
+     * freed the old EGLSurface with releaseEglSurface().
+     * <p>
+     * This is useful when we want to update the EGLSurface associated with a Surface.
+     * For example, if we want to share with a different EGLContext, which can only
+     * be done by tearing down and recreating the context.  (That's handled by the caller;
+     * this just creates a new EGLSurface for the Surface we were handed earlier.)
+     * <p>
+     * If the previous EGLSurface isn't fully destroyed, e.g. it's still current on a
+     * context somewhere, the create call will fail with complaints from the Surface
+     * about already being connected.
+     */
+    public void recreate(EglCore newEglCore) {
+        if (mSurface == null) {
+            throw new RuntimeException("not yet implemented for SurfaceTexture");
+        }
+        mEglCore = newEglCore;          // switch to new context
+        createWindowSurface(mSurface);  // create new surface
+    }
+}

cameraview/src/main/gles/com/otaliastudios/cameraview/VideoCoreEncoder.java

@@ -0,0 +1,201 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+package com.otaliastudios.cameraview;
+
+
+import android.media.MediaCodec;
+import android.media.MediaCodecInfo;
+import android.media.MediaFormat;
+import android.media.MediaMuxer;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.util.Log;
+import android.view.Surface;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * -- From grafika VideoEncoderCore.java --
+ *
+ * This class wraps up the core components used for surface-input video encoding.
+ * <p>
+ * Once created, frames are fed to the input surface.  Remember to provide the presentation
+ * time stamp, and always call drainEncoder() before swapBuffers() to ensure that the
+ * producer side doesn't get backed up.
+ * <p>
+ * This class is not thread-safe, with one exception: it is valid to use the input surface
+ * on one thread, and drain the output on a different thread.
+ */
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+class VideoCoreEncoder {
+
+    // TODO: these ought to be configurable as well
+    private static final String MIME_TYPE = "video/avc";    // H.264 Advanced Video Coding
+    private static final int FRAME_RATE = 30;               // 30fps
+    private static final int IFRAME_INTERVAL = 5;           // 5 seconds between I-frames
+
+    private Surface mInputSurface;
+    private MediaMuxer mMuxer;
+    private MediaCodec mEncoder;
+    private MediaCodec.BufferInfo mBufferInfo;
+    private int mTrackIndex;
+    private boolean mMuxerStarted;
+
+
+    /**
+     * Configures encoder and muxer state, and prepares the input Surface.
+     */
+    public VideoCoreEncoder(int width, int height, int bitRate, File outputFile)
+            throws IOException {
+        mBufferInfo = new MediaCodec.BufferInfo();
+
+        MediaFormat format = MediaFormat.createVideoFormat(MIME_TYPE, width, height);
+
+        // Set some properties.  Failing to specify some of these can cause the MediaCodec
+        // configure() call to throw an unhelpful exception.
+        format.setInteger(MediaFormat.KEY_COLOR_FORMAT,
+                MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
+        format.setInteger(MediaFormat.KEY_BIT_RATE, bitRate);
+        format.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);
+        format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL);
+
+        // Create a MediaCodec encoder, and configure it with our format.  Get a Surface
+        // we can use for input and wrap it with a class that handles the EGL work.
+        mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);
+        mEncoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
+        mInputSurface = mEncoder.createInputSurface();
+        mEncoder.start();
+
+        // Create a MediaMuxer.  We can't add the video track and start() the muxer here,
+        // because our MediaFormat doesn't have the Magic Goodies.  These can only be
+        // obtained from the encoder after it has started processing data.
+        //
+        // We're not actually interested in multiplexing audio.  We just want to convert
+        // the raw H.264 elementary stream we get from MediaCodec into a .mp4 file.
+        mMuxer = new MediaMuxer(outputFile.toString(),
+                MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
+
+        mTrackIndex = -1;
+        mMuxerStarted = false;
+    }
+
+    /**
+     * Returns the encoder's input surface.
+     */
+    public Surface getInputSurface() {
+        return mInputSurface;
+    }
+
+    /**
+     * Releases encoder resources.
+     */
+    public void release() {
+        if (mEncoder != null) {
+            mEncoder.stop();
+            mEncoder.release();
+            mEncoder = null;
+        }
+        if (mMuxer != null) {
+            // TODO: stop() throws an exception if you haven't fed it any data.  Keep track
+            //       of frames submitted, and don't call stop() if we haven't written anything.
+            mMuxer.stop();
+            mMuxer.release();
+            mMuxer = null;
+        }
+    }
+
+    /**
+     * Extracts all pending data from the encoder and forwards it to the muxer.
+     * <p>
+     * If endOfStream is not set, this returns when there is no more data to drain.  If it
+     * is set, we send EOS to the encoder, and then iterate until we see EOS on the output.
+     * Calling this with endOfStream set should be done once, right before stopping the muxer.
+     * <p>
+     * We're just using the muxer to get a .mp4 file (instead of a raw H.264 stream).  We're
+     * not recording audio.
+     */
+    public void drainEncoder(boolean endOfStream) {
+        final int TIMEOUT_USEC = 10000;
+
+        if (endOfStream) {
+            mEncoder.signalEndOfInputStream();
+        }
+
+        ByteBuffer[] encoderOutputBuffers = mEncoder.getOutputBuffers();
+        while (true) {
+            int encoderStatus = mEncoder.dequeueOutputBuffer(mBufferInfo, TIMEOUT_USEC);
+            if (encoderStatus == MediaCodec.INFO_TRY_AGAIN_LATER) {
+                // no output available yet
+                if (!endOfStream) {
+                    break; // out of while
+                }
+            } else if (encoderStatus == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
+                // not expected for an encoder
+                encoderOutputBuffers = mEncoder.getOutputBuffers();
+            } else if (encoderStatus == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
+                // should happen before receiving buffers, and should only happen once
+                if (mMuxerStarted) {
+                    throw new RuntimeException("format changed twice");
+                }
+                MediaFormat newFormat = mEncoder.getOutputFormat();
+
+                // now that we have the Magic Goodies, start the muxer
+                mTrackIndex = mMuxer.addTrack(newFormat);
+                mMuxer.start();
+                mMuxerStarted = true;
+            } else if (encoderStatus < 0) {
+                Log.w("VideoCoreEncoder", "unexpected result from encoder.dequeueOutputBuffer: " + encoderStatus);
+                // let's ignore it
+            } else {
+                ByteBuffer encodedData = encoderOutputBuffers[encoderStatus];
+                if (encodedData == null) {
+                    throw new RuntimeException("encoderOutputBuffer " + encoderStatus + " was null");
+                }
+
+                if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
+                    // The codec config data was pulled out and fed to the muxer when we got
+                    // the INFO_OUTPUT_FORMAT_CHANGED status.  Ignore it.
+                    mBufferInfo.size = 0;
+                }
+
+                if (mBufferInfo.size != 0) {
+                    if (!mMuxerStarted) {
+                        throw new RuntimeException("muxer hasn't started");
+                    }
+
+                    // adjust the ByteBuffer values to match BufferInfo (not needed?)
+                    encodedData.position(mBufferInfo.offset);
+                    encodedData.limit(mBufferInfo.offset + mBufferInfo.size);
+
+                    mMuxer.writeSampleData(mTrackIndex, encodedData, mBufferInfo);
+                }
+
+                mEncoder.releaseOutputBuffer(encoderStatus, false);
+
+                if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
+                    if (!endOfStream) {
+                        Log.w("VideoCoreEncoder", "reached end of stream unexpectedly");
+                    }
+                    break; // out of while
+                }
+            }
+        }
+    }
+}
+

cameraview/src/main/gles/com/otaliastudios/cameraview/VideoTextureEncoder.java

@@ -0,0 +1,397 @@
+/*
+ * Copyright 2013 Google Inc. All rights reserved.
+ *
+ * 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.
+ */
+package com.otaliastudios.cameraview;
+
+import android.graphics.SurfaceTexture;
+import android.opengl.EGLContext;
+import android.opengl.GLES20;
+import android.os.Build;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+import android.support.annotation.RequiresApi;
+import android.util.Log;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.ref.WeakReference;
+
+
+/**
+ * -- from grafika --
+ *
+ * Encode a movie from frames rendered from an external texture image.
+ * <p>
+ * The object wraps an encoder running on a dedicated thread.  The various control messages
+ * may be sent from arbitrary threads (typically the app UI thread).  The encoder thread
+ * manages both sides of the encoder (feeding and draining); the only external input is
+ * the GL texture.
+ * <p>
+ * The design is complicated slightly by the need to create an EGL context that shares state
+ * with a view that gets restarted if (say) the device orientation changes.  When the view
+ * in question is a GLSurfaceView, we don't have full control over the EGL context creation
+ * on that side, so we have to bend a bit backwards here.
+ * <p>
+ * To use:
+ * <ul>
+ * <li>create TextureMovieEncoder object
+ * <li>create an EncoderConfig
+ * <li>call TextureMovieEncoder#startRecording() with the config
+ * <li>call TextureMovieEncoder#setTextureId() with the texture object that receives frames
+ * <li>for each frame, after latching it with SurfaceTexture#updateTexImage(),
+ *     call TextureMovieEncoder#frameAvailable().
+ * </ul>
+ *
+ * TODO: tweak the API (esp. textureId) so it's less awkward for simple use cases.
+ */
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+class VideoTextureEncoder implements Runnable {
+    private static final String TAG = VideoTextureEncoder.class.getSimpleName();
+
+    private static final int MSG_START_RECORDING = 0;
+    private static final int MSG_STOP_RECORDING = 1;
+    private static final int MSG_FRAME_AVAILABLE = 2;
+    private static final int MSG_SET_TEXTURE_ID = 3;
+    private static final int MSG_UPDATE_SHARED_CONTEXT = 4;
+    private static final int MSG_QUIT = 5;
+
+    // ----- accessed exclusively by encoder thread -----
+    private EglWindowSurface mInputWindowSurface;
+    private EglCore mEglCore;
+    private EglViewport mFullScreen;
+    private int mTextureId;
+    private int mFrameNum;
+    private VideoCoreEncoder mVideoEncoder;
+
+    // ----- accessed by multiple threads -----
+    private volatile EncoderHandler mHandler;
+
+    private final Object mReadyFence = new Object(); // guards ready/running
+    private boolean mReady;
+    private boolean mRunning;
+
+
+    /**
+     * Encoder configuration.
+     * <p>
+     * Object is immutable, which means we can safely pass it between threads without
+     * explicit synchronization (and don't need to worry about it getting tweaked out from
+     * under us).
+     * <p>
+     * TODO: make frame rate and iframe interval configurable?
+     */
+    public static class EncoderConfig {
+        final File mOutputFile;
+        final int mWidth;
+        final int mHeight;
+        final int mBitRate;
+        final EGLContext mEglContext;
+
+        public EncoderConfig(File outputFile, int width, int height, int bitRate,
+                             EGLContext sharedEglContext) {
+            mOutputFile = outputFile;
+            mWidth = width;
+            mHeight = height;
+            mBitRate = bitRate;
+            mEglContext = sharedEglContext;
+        }
+
+        @Override
+        public String toString() {
+            return "EncoderConfig: " + mWidth + "x" + mHeight + " @" + mBitRate +
+                    " to '" + mOutputFile.toString() + "' ctxt=" + mEglContext;
+        }
+    }
+
+    /**
+     * Tells the video recorder to start recording.  (Call from non-encoder thread.)
+     * <p>
+     * Creates a new thread, which will create an encoder using the provided configuration.
+     * <p>
+     * Returns after the recorder thread has started and is ready to accept Messages.  The
+     * encoder may not yet be fully configured.
+     */
+    public void startRecording(EncoderConfig config) {
+        Log.d(TAG, "Encoder: startRecording()");
+        synchronized (mReadyFence) {
+            if (mRunning) {
+                Log.w(TAG, "Encoder thread already running");
+                return;
+            }
+            mRunning = true;
+            new Thread(this, "TextureMovieEncoder").start();
+            while (!mReady) {
+                try {
+                    mReadyFence.wait();
+                } catch (InterruptedException ie) {
+                    // ignore
+                }
+            }
+        }
+
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_START_RECORDING, config));
+    }
+
+    /**
+     * Tells the video recorder to stop recording.  (Call from non-encoder thread.)
+     * <p>
+     * Returns immediately; the encoder/muxer may not yet be finished creating the movie.
+     * <p>
+     * TODO: have the encoder thread invoke a callback on the UI thread just before it shuts down
+     * so we can provide reasonable status UI (and let the caller know that movie encoding
+     * has completed).
+     */
+    public void stopRecording(Runnable onStop) {
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_STOP_RECORDING, onStop));
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_QUIT));
+        // We don't know when these will actually finish (or even start).  We don't want to
+        // delay the UI thread though, so we return immediately.
+    }
+
+    /**
+     * Returns true if recording has been started.
+     */
+    public boolean isRecording() {
+        synchronized (mReadyFence) {
+            return mRunning;
+        }
+    }
+
+    /**
+     * Tells the video recorder to refresh its EGL surface.  (Call from non-encoder thread.)
+     */
+    public void updateSharedContext(EGLContext sharedContext) {
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE_SHARED_CONTEXT, sharedContext));
+    }
+
+    /**
+     * Tells the video recorder that a new frame is available.  (Call from non-encoder thread.)
+     * <p>
+     * This function sends a message and returns immediately.  This isn't sufficient -- we
+     * don't want the caller to latch a new frame until we're done with this one -- but we
+     * can get away with it so long as the input frame rate is reasonable and the encoder
+     * thread doesn't stall.
+     * <p>
+     * TODO: either block here until the texture has been rendered onto the encoder surface,
+     * or have a separate "block if still busy" method that the caller can execute immediately
+     * before it calls updateTexImage().  The latter is preferred because we don't want to
+     * stall the caller while this thread does work.
+     */
+    public void frameAvailable(SurfaceTexture st) {
+        synchronized (mReadyFence) {
+            if (!mReady) {
+                return;
+            }
+        }
+
+        float[] transform = new float[16];      // TODO - avoid alloc every frame
+        st.getTransformMatrix(transform);
+        long timestamp = st.getTimestamp();
+        if (timestamp == 0) {
+            // Seeing this after device is toggled off/on with power button.  The
+            // first frame back has a zero timestamp.
+            // MPEG4Writer thinks this is cause to abort() in native code, so it's very
+            // important that we just ignore the frame.
+            Log.w(TAG, "HEY: got SurfaceTexture with timestamp of zero");
+            return;
+        }
+
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_FRAME_AVAILABLE,
+                (int) (timestamp >> 32), (int) timestamp, transform));
+    }
+
+    /**
+     * Tells the video recorder what texture name to use.  This is the external texture that
+     * we're receiving camera previews in.  (Call from non-encoder thread.)
+     * <p>
+     * TODO: do something less clumsy
+     */
+    public void setTextureId(int id) {
+        synchronized (mReadyFence) {
+            if (!mReady) return;
+        }
+        mHandler.sendMessage(mHandler.obtainMessage(MSG_SET_TEXTURE_ID, id, 0, null));
+    }
+
+    /**
+     * Encoder thread entry point.  Establishes Looper/Handler and waits for messages.
+     * <p>
+     * @see java.lang.Thread#run()
+     */
+    @Override
+    public void run() {
+        // Establish a Looper for this thread, and define a Handler for it.
+        Looper.prepare();
+        synchronized (mReadyFence) {
+            mHandler = new EncoderHandler(this);
+            mReady = true;
+            mReadyFence.notify();
+        }
+        Looper.loop();
+
+        Log.d(TAG, "Encoder thread exiting");
+        synchronized (mReadyFence) {
+            mReady = mRunning = false;
+            mHandler = null;
+        }
+    }
+
+
+    /**
+     * Handles encoder state change requests.  The handler is created on the encoder thread.
+     */
+    private static class EncoderHandler extends Handler {
+        private WeakReference<VideoTextureEncoder> mWeakEncoder;
+
+        public EncoderHandler(VideoTextureEncoder encoder) {
+            mWeakEncoder = new WeakReference<>(encoder);
+        }
+
+        @Override  // runs on encoder thread
+        public void handleMessage(Message inputMessage) {
+            int what = inputMessage.what;
+            Object obj = inputMessage.obj;
+
+            VideoTextureEncoder encoder = mWeakEncoder.get();
+            if (encoder == null) {
+                Log.w(TAG, "EncoderHandler.handleMessage: encoder is null");
+                return;
+            }
+
+            switch (what) {
+                case MSG_START_RECORDING:
+                    encoder.handleStartRecording((EncoderConfig) obj);
+                    break;
+                case MSG_STOP_RECORDING:
+                    encoder.handleStopRecording((Runnable) inputMessage.obj);
+                    break;
+                case MSG_FRAME_AVAILABLE:
+                    long timestamp = (((long) inputMessage.arg1) << 32) |
+                            (((long) inputMessage.arg2) & 0xffffffffL);
+                    encoder.handleFrameAvailable((float[]) obj, timestamp);
+                    break;
+                case MSG_SET_TEXTURE_ID:
+                    encoder.handleSetTexture(inputMessage.arg1);
+                    break;
+                case MSG_UPDATE_SHARED_CONTEXT:
+                    encoder.handleUpdateSharedContext((EGLContext) inputMessage.obj);
+                    break;
+                case MSG_QUIT:
+                    Looper.myLooper().quit();
+                    break;
+                default:
+                    throw new RuntimeException("Unhandled msg what=" + what);
+            }
+        }
+    }
+
+    /**
+     * Starts recording.
+     */
+    private void handleStartRecording(EncoderConfig config) {
+        Log.d(TAG, "handleStartRecording " + config);
+        mFrameNum = 0;
+        prepareEncoder(config.mEglContext, config.mWidth, config.mHeight, config.mBitRate,
+                config.mOutputFile);
+    }
+
+    /**
+     * Handles notification of an available frame.
+     * <p>
+     * The texture is rendered onto the encoder's input surface, along with a moving
+     * box (just because we can).
+     * <p>
+     * @param transform The texture transform, from SurfaceTexture.
+     * @param timestampNanos The frame's timestamp, from SurfaceTexture.
+     */
+    private void handleFrameAvailable(float[] transform, long timestampNanos) {
+        mVideoEncoder.drainEncoder(false);
+        mFullScreen.drawFrame(mTextureId, transform);
+        mInputWindowSurface.setPresentationTime(timestampNanos);
+        mInputWindowSurface.swapBuffers();
+    }
+
+    /**
+     * Handles a request to stop encoding.
+     */
+    private void handleStopRecording(Runnable onStop) {
+        Log.d(TAG, "handleStopRecording");
+        mVideoEncoder.drainEncoder(true);
+        releaseEncoder();
+        onStop.run();
+    }
+
+    /**
+     * Sets the texture name that SurfaceTexture will use when frames are received.
+     */
+    private void handleSetTexture(int id) {
+        mTextureId = id;
+    }
+
+    /**
+     * Tears down the EGL surface and context we've been using to feed the MediaCodec input
+     * surface, and replaces it with a new one that shares with the new context.
+     * <p>
+     * This is useful if the old context we were sharing with went away (maybe a GLSurfaceView
+     * that got torn down) and we need to hook up with the new one.
+     */
+    private void handleUpdateSharedContext(EGLContext newSharedContext) {
+        Log.d(TAG, "handleUpdatedSharedContext " + newSharedContext);
+
+        // Release the EGLSurface and EGLContext.
+        mInputWindowSurface.releaseEglSurface();
+        mFullScreen.release(false);
+        mEglCore.release();
+
+        // Create a new EGLContext and recreate the window surface.
+        mEglCore = new EglCore(newSharedContext, EglCore.FLAG_RECORDABLE);
+        mInputWindowSurface.recreate(mEglCore);
+        mInputWindowSurface.makeCurrent();
+
+        // Create new programs and such for the new context.
+        mFullScreen = new EglViewport();
+    }
+
+    private void prepareEncoder(EGLContext sharedContext, int width, int height, int bitRate,
+                                File outputFile) {
+        try {
+            mVideoEncoder = new VideoCoreEncoder(width, height, bitRate, outputFile);
+        } catch (IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+        mEglCore = new EglCore(sharedContext, EglCore.FLAG_RECORDABLE);
+        mInputWindowSurface = new EglWindowSurface(mEglCore, mVideoEncoder.getInputSurface(), true);
+        mInputWindowSurface.makeCurrent();
+
+        mFullScreen = new EglViewport();
+    }
+
+    private void releaseEncoder() {
+        mVideoEncoder.release();
+        if (mInputWindowSurface != null) {
+            mInputWindowSurface.release();
+            mInputWindowSurface = null;
+        }
+        if (mFullScreen != null) {
+            mFullScreen.release(false);
+            mFullScreen = null;
+        }
+        if (mEglCore != null) {
+            mEglCore.release();
+            mEglCore = null;
+        }
+    }
+}

cameraview/src/main/java/com/otaliastudios/cameraview/Camera1.java

@@ -696,6 +696,39 @@ class Camera1 extends CameraController implements Camera.PreviewCallback, Camera
         });
     }
 
+    @Override
+    void takeVideoSnapshot(@NonNull final File file) {
+        // TODO check api level and Preview instance
+        schedule(mStartVideoTask, true, new Runnable() {
+            @Override
+            public void run() {
+                if (mIsTakingVideo) return;
+                mIsTakingVideo = true;
+
+                // Create the video result stub
+                VideoResult videoResult = new VideoResult();
+                videoResult.file = file;
+                videoResult.isSnapshot = true;
+                videoResult.codec = mVideoCodec;
+                videoResult.location = mLocation;
+                videoResult.rotation = offset(REF_SENSOR, REF_OUTPUT);
+                Size preview = getPreviewSize(REF_VIEW); // The preview stream size in REF_VIEW
+                Size view = mPreview.getOutputSurfaceSize(); // The view size in REF_VIEW
+                Rect crop = CropHelper.computeCrop(preview, AspectRatio.of(view.getWidth(), view.getHeight()));
+                Size cropSize = new Size(crop.width(), crop.height()); // The visible size in REF_VIEW
+                // Move the REF_VIEW size to REF_OUTPUT
+                videoResult.size = flip(REF_VIEW, REF_OUTPUT) ? cropSize.flip() : cropSize;
+                videoResult.audio = mAudio;
+                videoResult.maxSize = mVideoMaxSize;
+                videoResult.maxDuration = mVideoMaxDuration;
+
+                GLCameraPreview cameraPreview = (GLCameraPreview) mPreview;
+                mVideoRecorder = new MediaCodecVideoRecorder(videoResult, Camera1.this, cameraPreview, mCameraId);
+                mVideoRecorder.start();
+            }
+        });
+    }
+
     @Override
     void stopVideo() {
         schedule(null, false, new Runnable() {

cameraview/src/main/java/com/otaliastudios/cameraview/CameraController.java

@@ -331,6 +331,8 @@ abstract class CameraController implements
 
     abstract void takeVideo(@NonNull File file);
 
+    abstract void takeVideoSnapshot(@NonNull File file);
+
     abstract void stopVideo();
 
     abstract void startAutoFocus(@Nullable Gesture gesture, PointF point);

cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java

@@ -1171,7 +1171,7 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
      *
      * @param file a file where the video will be saved
      */
-    public void takeVideo(File file) {
+    public void takeVideo(@Nullable File file) {
         if (file == null) {
             file = new File(getContext().getFilesDir(), "video.mp4");
         }
@@ -1185,6 +1185,20 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         });
     }
 
+    public void takeVideoSnapshot(@Nullable File file) {
+        if (file == null) {
+            file = new File(getContext().getFilesDir(), "video.mp4");
+        }
+        mCameraController.takeVideoSnapshot(file);
+        mUiHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                mKeepScreenOn = getKeepScreenOn();
+                if (!mKeepScreenOn) setKeepScreenOn(true);
+            }
+        });
+    }
+
 
     /**
      * Starts recording a video. Video will be written to the given file,
@@ -1209,6 +1223,19 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         takeVideo(file);
     }
 
+    public void takeVideoSnapshot(File file, int durationMillis) {
+        final int old = getVideoMaxDuration();
+        addCameraListener(new CameraListener() {
+            @Override
+            public void onVideoTaken(VideoResult result) {
+                setVideoMaxDuration(old);
+                removeCameraListener(this);
+            }
+        });
+        setVideoMaxDuration(durationMillis);
+        takeVideoSnapshot(file);
+    }
+
 
     // TODO: pauseCapturingVideo and resumeCapturingVideo. There is mediarecorder.pause(), but API 24...
 

cameraview/src/main/java/com/otaliastudios/cameraview/MediaCodecVideoRecorder.java

@@ -1,27 +1,98 @@
 package com.otaliastudios.cameraview;
 
+import android.graphics.SurfaceTexture;
 import android.hardware.Camera;
 import android.media.CamcorderProfile;
 import android.media.MediaRecorder;
+import android.opengl.EGL14;
+import android.os.Build;
+import android.os.Handler;
+import android.support.annotation.RequiresApi;
 
 /**
  * A {@link VideoRecorder} that uses {@link android.media.MediaCodec} APIs.
  */
-class MediaCodecVideoRecorder extends VideoRecorder {
+@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
+class MediaCodecVideoRecorder extends VideoRecorder implements GLCameraPreview.RendererFrameCallback {
 
     private static final String TAG = MediaCodecVideoRecorder.class.getSimpleName();
     private static final CameraLogger LOG = CameraLogger.create(TAG);
 
-    MediaCodecVideoRecorder(VideoResult stub, VideoResultListener listener, Camera camera, int cameraId) {
+    private static final int STATE_RECORDING = 0;
+    private static final int STATE_NOT_RECORDING = 1;
+
+    private CamcorderProfile mProfile;
+    private VideoTextureEncoder mEncoder;
+    private GLCameraPreview mPreview;
+
+    private int mCurrentState = STATE_NOT_RECORDING;
+    private int mDesiredState = STATE_NOT_RECORDING;
+    private int mTextureId = 0;
+
+    MediaCodecVideoRecorder(VideoResult stub, VideoResultListener listener, GLCameraPreview preview, int cameraId) {
         super(stub, listener);
+        mProfile = CamcorderProfile.get(cameraId, CamcorderProfile.QUALITY_HIGH);
+        mEncoder = new VideoTextureEncoder();
+        mPreview = preview;
+        mPreview.setRendererFrameCallback(this);
     }
 
     @Override
     void start() {
+        mDesiredState = STATE_RECORDING;
+        if (mResult.maxDuration > 0) {
+            new Handler().postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    mDesiredState = STATE_NOT_RECORDING;
+                }
+            }, (long) mResult.maxDuration);
+        }
+    }
+
+    @Override
+    void stop() {
+        mDesiredState = STATE_NOT_RECORDING;
     }
 
     @Override
-    void close() {
+    public void onRendererTextureCreated(int textureId) {
+        mTextureId = textureId;
+    }
+
+    @Override
+    public void onRendererFrame(SurfaceTexture surfaceTexture) {
+        if (mCurrentState == STATE_NOT_RECORDING && mDesiredState == STATE_RECORDING) {
+            VideoTextureEncoder.EncoderConfig configuration = new VideoTextureEncoder.EncoderConfig(
+                    mResult.file,
+                    mResult.size.getWidth(),
+                    mResult.size.getHeight(),
+                    1000000,
+                    EGL14.eglGetCurrentContext()
+            );
+            mEncoder.startRecording(configuration);
+            mEncoder.setTextureId(mTextureId);
+            mCurrentState = STATE_RECORDING;
+        }
+
+        if (mCurrentState == STATE_RECORDING) {
+            mEncoder.frameAvailable(surfaceTexture);
+        }
+
+        if (mCurrentState == STATE_RECORDING && mDesiredState == STATE_NOT_RECORDING) {
+            mEncoder.stopRecording(new Runnable() {
+                @Override
+                public void run() {
+                    // We are in the encoder thread.
+                    dispatchResult();
+                }
+            });
+            mCurrentState = STATE_NOT_RECORDING;
+
+            mEncoder = null;
+            mPreview.setRendererFrameCallback(null);
+            mPreview = null;
+        }
 
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/MediaRecorderVideoRecorder.java

@@ -90,7 +90,7 @@ class MediaRecorderVideoRecorder extends VideoRecorder {
     }
 
     @Override
-    void close() {
+    void stop() {
         if (mMediaRecorder != null) {
             try {
                 mMediaRecorder.stop();
@@ -103,5 +103,6 @@ class MediaRecorderVideoRecorder extends VideoRecorder {
         mProfile = null;
         mMediaRecorder = null;
         mMapper = null;
+        dispatchResult();
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/VideoRecorder.java

@@ -21,17 +21,16 @@ abstract class VideoRecorder {
 
     abstract void start();
 
-    final void stop() {
+    abstract void stop();
+
+    protected void dispatchResult() {
         if (mListener != null) {
-            close();
             mListener.onVideoResult(mResult);
             mListener = null;
             mResult = null;
         }
     }
 
-    abstract void close();
-
 
     interface VideoResultListener {
         void onVideoResult(@Nullable VideoResult result);

cameraview/src/main/views/com/otaliastudios/cameraview/GLCameraPreview.java

@@ -5,7 +5,7 @@ import android.graphics.SurfaceTexture;
 import android.opengl.GLSurfaceView;
 import android.opengl.Matrix;
 import android.support.annotation.NonNull;
-import android.util.Log;
+import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.SurfaceHolder;
 import android.view.View;
@@ -53,7 +53,8 @@ class GLCameraPreview extends CameraPreview<GLSurfaceView, SurfaceTexture> imple
     private final float[] mTransformMatrix = new float[16];
     private int mOutputTextureId = -1;
     private SurfaceTexture mInputSurfaceTexture;
-    private GLViewport mOutputViewport;
+    private EglViewport mOutputViewport;
+    private RendererFrameCallback mRendererFrameCallback;
 
     GLCameraPreview(Context context, ViewGroup parent, SurfaceCallback callback) {
         super(context, parent, callback);
@@ -104,6 +105,7 @@ class GLCameraPreview extends CameraPreview<GLSurfaceView, SurfaceTexture> imple
             mInputSurfaceTexture.release();
             mInputSurfaceTexture = null;
         }
+        mOutputTextureId = 0;
         if (mOutputViewport != null) {
             mOutputViewport.release();
             mOutputViewport = null;
@@ -111,7 +113,7 @@ class GLCameraPreview extends CameraPreview<GLSurfaceView, SurfaceTexture> imple
     }
 
     private void createInputSurfaceTexture() {
-        mOutputViewport = new GLViewport();
+        mOutputViewport = new EglViewport();
         mOutputTextureId = mOutputViewport.createTexture();
         mInputSurfaceTexture = new SurfaceTexture(mOutputTextureId);
 
@@ -169,6 +171,10 @@ class GLCameraPreview extends CameraPreview<GLSurfaceView, SurfaceTexture> imple
             return;
         }
 
+        if (mRendererFrameCallback != null) {
+            mRendererFrameCallback.onRendererFrame(mInputSurfaceTexture);
+        }
+
         // Draw the video frame.
         mInputSurfaceTexture.getTransformMatrix(mTransformMatrix);
         if (isCropping()) {
@@ -324,4 +330,19 @@ class GLCameraPreview extends CameraPreview<GLSurfaceView, SurfaceTexture> imple
             }
         });
     }
+
+    interface RendererFrameCallback {
+        // Renderer thread.
+        void onRendererTextureCreated(int textureId);
+
+        // Renderer thread.
+        void onRendererFrame(SurfaceTexture surfaceTexture);
+    }
+
+    void setRendererFrameCallback(@Nullable RendererFrameCallback callback) {
+        mRendererFrameCallback = callback;
+        if (mRendererFrameCallback != null && mOutputTextureId != 0) {
+            mRendererFrameCallback.onRendererTextureCreated(mOutputTextureId);
+        }
+    }
 }

demo/src/main/java/com/otaliastudios/cameraview/demo/CameraActivity.java

@@ -53,6 +53,7 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
         findViewById(R.id.capturePicture).setOnClickListener(this);
         findViewById(R.id.capturePictureSnapshot).setOnClickListener(this);
         findViewById(R.id.captureVideo).setOnClickListener(this);
+        findViewById(R.id.captureVideoSnapshot).setOnClickListener(this);
         findViewById(R.id.toggleCamera).setOnClickListener(this);
 
         controlPanel = findViewById(R.id.controls);
@@ -118,6 +119,7 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
             case R.id.capturePicture: capturePicture(); break;
             case R.id.capturePictureSnapshot: capturePictureSnapshot(); break;
             case R.id.captureVideo: captureVideo(); break;
+            case R.id.captureVideoSnapshot: captureVideoSnapshot(); break;
             case R.id.toggleCamera: toggleCamera(); break;
         }
     }
@@ -165,6 +167,15 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
         camera.takeVideo(null, 5000);
     }
 
+    private void captureVideoSnapshot() {
+        if (camera.isTakingVideo()) {
+            message("Already taking video.", false);
+            return;
+        }
+        message("Recording snapshot for 5 seconds...", true);
+        camera.takeVideoSnapshot(null, 5000);
+    }
+
     private void toggleCamera() {
         if (camera.isTakingPicture() || camera.isTakingVideo()) return;
         switch (camera.toggleFacing()) {