Skip to content

Instantly share code, notes, and snippets.

@tachang

tachang/CameraToMpegTest.java

Created June 17, 2014 17:43
Show Gist options
  • Star 3 You must be signed in to star a gist
  • Fork 1 You must be signed in to fork a gist
  • Save tachang/c8de5c2dffd9c5f34724 to your computer and use it in GitHub Desktop.
Save tachang/c8de5c2dffd9c5f34724 to your computer and use it in GitHub Desktop.
Download ZIP
CameraToMpegTest.java
Raw
CameraToMpegTest.java
/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media.cts;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.media.MediaFormat;
import android.media.MediaMuxer;
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.opengl.GLES11Ext;
import android.opengl.GLES20;
import android.opengl.Matrix;
import android.os.Environment;
import android.test.AndroidTestCase;
import android.util.Log;
import android.view.Surface;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
//20131106: removed unnecessary glFinish(), removed hard-coded "/sdcard"
//20131205: added alpha to EGLConfig
//20131210: demonstrate un-bind and re-bind of texture, for apps with shared EGL contexts
//20140123: correct error checks on glGet*Location() and program creation (they don't set error)
/**
* Record video from the camera preview and encode it as an MP4 file. Demonstrates the use
* of MediaMuxer and MediaCodec with Camera input. Does not record audio.
* <p>
* Generally speaking, it's better to use MediaRecorder for this sort of thing. This example
* demonstrates one possible advantage: editing of video as it's being encoded. A GLES 2.0
* fragment shader is used to perform a silly color tweak every 15 frames.
* <p>
* This uses various features first available in Android "Jellybean" 4.3 (API 18). There is
* no equivalent functionality in previous releases. (You can send the Camera preview to a
* byte buffer with a fully-specified format, but MediaCodec encoders want different input
* formats on different devices, and this use case wasn't well exercised in CTS pre-4.3.)
* <p>
* The output file will be something like "/sdcard/test.640x480.mp4".
* <p>
* (This was derived from bits and pieces of CTS tests, and is packaged as such, but is not
* currently part of CTS.)
*/
public class CameraToMpegTest extends AndroidTestCase {
private static final String TAG = "CameraToMpegTest";
private static final boolean VERBOSE = false; // lots of logging
// where to put the output file (note: /sdcard requires WRITE_EXTERNAL_STORAGE permission)
private static final File OUTPUT_DIR = Environment.getExternalStorageDirectory();
// parameters for the encoder
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 static final long DURATION_SEC = 8; // 8 seconds of video
// Fragment shader that swaps color channels around.
private static final String SWAPPED_FRAGMENT_SHADER =
"#extension GL_OES_EGL_image_external : require\n" +
"precision mediump float;\n" +
"varying vec2 vTextureCoord;\n" +
"uniform samplerExternalOES sTexture;\n" +
"void main() {\n" +
" gl_FragColor = texture2D(sTexture, vTextureCoord).gbra;\n" +
"}\n";
// encoder / muxer state
private MediaCodec mEncoder;
private CodecInputSurface mInputSurface;
private MediaMuxer mMuxer;
private int mTrackIndex;
private boolean mMuxerStarted;
// camera state
private Camera mCamera;
private SurfaceTextureManager mStManager;
// allocate one of these up front so we don't need to do it every time
private MediaCodec.BufferInfo mBufferInfo;
/** test entry point */
public void testEncodeCameraToMp4() throws Throwable {
CameraToMpegWrapper.runTest(this);
}
/**
* Wraps encodeCameraToMpeg(). This is necessary because SurfaceTexture will try to use
* the looper in the current thread if one exists, and the CTS tests create one on the
* test thread.
*
* The wrapper propagates exceptions thrown by the worker thread back to the caller.
*/
private static class CameraToMpegWrapper implements Runnable {
private Throwable mThrowable;
private CameraToMpegTest mTest;
private CameraToMpegWrapper(CameraToMpegTest test) {
mTest = test;
}
@Override
public void run() {
try {
mTest.encodeCameraToMpeg();
} catch (Throwable th) {
mThrowable = th;
}
}
/** Entry point. */
public static void runTest(CameraToMpegTest obj) throws Throwable {
CameraToMpegWrapper wrapper = new CameraToMpegWrapper(obj);
Thread th = new Thread(wrapper, "codec test");
th.start();
th.join();
if (wrapper.mThrowable != null) {
throw wrapper.mThrowable;
}
}
}
/**
* Tests encoding of AVC video from Camera input. The output is saved as an MP4 file.
*/
private void encodeCameraToMpeg() {
// arbitrary but popular values
int encWidth = 640;
int encHeight = 480;
int encBitRate = 6000000; // Mbps
Log.d(TAG, MIME_TYPE + " output " + encWidth + "x" + encHeight + " @" + encBitRate);
try {
prepareCamera(encWidth, encHeight);
prepareEncoder(encWidth, encHeight, encBitRate);
mInputSurface.makeCurrent();
prepareSurfaceTexture();
mCamera.startPreview();
long startWhen = System.nanoTime();
long desiredEnd = startWhen + DURATION_SEC * 1000000000L;
SurfaceTexture st = mStManager.getSurfaceTexture();
int frameCount = 0;
while (System.nanoTime() < desiredEnd) {
// Feed any pending encoder output into the muxer.
drainEncoder(false);
// Switch up the colors every 15 frames. Besides demonstrating the use of
// fragment shaders for video editing, this provides a visual indication of
// the frame rate: if the camera is capturing at 15fps, the colors will change
// once per second.
if ((frameCount % 15) == 0) {
String fragmentShader = null;
if ((frameCount & 0x01) != 0) {
fragmentShader = SWAPPED_FRAGMENT_SHADER;
}
mStManager.changeFragmentShader(fragmentShader);
}
frameCount++;
// Acquire a new frame of input, and render it to the Surface. If we had a
// GLSurfaceView we could switch EGL contexts and call drawImage() a second
// time to render it on screen. The texture can be shared between contexts by
// passing the GLSurfaceView's EGLContext as eglCreateContext()'s share_context
// argument.
mStManager.awaitNewImage();
mStManager.drawImage();
// Set the presentation time stamp from the SurfaceTexture's time stamp. This
// will be used by MediaMuxer to set the PTS in the video.
if (VERBOSE) {
Log.d(TAG, "present: " +
((st.getTimestamp() - startWhen) / 1000000.0) + "ms");
}
mInputSurface.setPresentationTime(st.getTimestamp());
// Submit it to the encoder. The eglSwapBuffers call will block if the input
// is full, which would be bad if it stayed full until we dequeued an output
// buffer (which we can't do, since we're stuck here). So long as we fully drain
// the encoder before supplying additional input, the system guarantees that we
// can supply another frame without blocking.
if (VERBOSE) Log.d(TAG, "sending frame to encoder");
mInputSurface.swapBuffers();
}
// send end-of-stream to encoder, and drain remaining output
drainEncoder(true);
} finally {
// release everything we grabbed
releaseCamera();
releaseEncoder();
releaseSurfaceTexture();
}
}
/**
* Configures Camera for video capture. Sets mCamera.
* <p>
* Opens a Camera and sets parameters. Does not start preview.
*/
private void prepareCamera(int encWidth, int encHeight) {
if (mCamera != null) {
throw new RuntimeException("camera already initialized");
}
Camera.CameraInfo info = new Camera.CameraInfo();
// Try to find a front-facing camera (e.g. for videoconferencing).
int numCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numCameras; i++) {
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
mCamera = Camera.open(i);
break;
}
}
if (mCamera == null) {
Log.d(TAG, "No front-facing camera found; opening default");
mCamera = Camera.open(); // opens first back-facing camera
}
if (mCamera == null) {
throw new RuntimeException("Unable to open camera");
}
Camera.Parameters parms = mCamera.getParameters();
choosePreviewSize(parms, encWidth, encHeight);
// leave the frame rate set to default
mCamera.setParameters(parms);
Camera.Size size = parms.getPreviewSize();
Log.d(TAG, "Camera preview size is " + size.width + "x" + size.height);
}
/**
* Attempts to find a preview size that matches the provided width and height (which
* specify the dimensions of the encoded video). If it fails to find a match it just
* uses the default preview size.
* <p>
* TODO: should do a best-fit match.
*/
private static void choosePreviewSize(Camera.Parameters parms, int width, int height) {
// We should make sure that the requested MPEG size is less than the preferred
// size, and has the same aspect ratio.
Camera.Size ppsfv = parms.getPreferredPreviewSizeForVideo();
if (VERBOSE && ppsfv != null) {
Log.d(TAG, "Camera preferred preview size for video is " +
ppsfv.width + "x" + ppsfv.height);
}
for (Camera.Size size : parms.getSupportedPreviewSizes()) {
if (size.width == width && size.height == height) {
parms.setPreviewSize(width, height);
return;
}
}
Log.w(TAG, "Unable to set preview size to " + width + "x" + height);
if (ppsfv != null) {
parms.setPreviewSize(ppsfv.width, ppsfv.height);
}
}
/**
* Stops camera preview, and releases the camera to the system.
*/
private void releaseCamera() {
if (VERBOSE) Log.d(TAG, "releasing camera");
if (mCamera != null) {
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
/**
* Configures SurfaceTexture for camera preview. Initializes mStManager, and sets the
* associated SurfaceTexture as the Camera's "preview texture".
* <p>
* Configure the EGL surface that will be used for output before calling here.
*/
private void prepareSurfaceTexture() {
mStManager = new SurfaceTextureManager();
SurfaceTexture st = mStManager.getSurfaceTexture();
try {
mCamera.setPreviewTexture(st);
} catch (IOException ioe) {
throw new RuntimeException("setPreviewTexture failed", ioe);
}
}
/**
* Releases the SurfaceTexture.
*/
private void releaseSurfaceTexture() {
if (mStManager != null) {
mStManager.release();
mStManager = null;
}
}
/**
* Configures encoder and muxer state, and prepares the input Surface. Initializes
* mEncoder, mMuxer, mInputSurface, mBufferInfo, mTrackIndex, and mMuxerStarted.
*/
private void prepareEncoder(int width, int height, int bitRate) {
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);
if (VERBOSE) Log.d(TAG, "format: " + format);
// 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.
//
// If you want to have two EGL contexts -- one for display, one for recording --
// you will likely want to defer instantiation of CodecInputSurface until after the
// "display" EGL context is created, then modify the eglCreateContext call to
// take eglGetCurrentContext() as the share_context argument.
mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);
mEncoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mInputSurface = new CodecInputSurface(mEncoder.createInputSurface());
mEncoder.start();
// Output filename. Ideally this would use Context.getFilesDir() rather than a
// hard-coded output directory.
String outputPath = new File(OUTPUT_DIR,
"test." + width + "x" + height + ".mp4").toString();
Log.i(TAG, "Output file is " + outputPath);
// 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.
try {
mMuxer = new MediaMuxer(outputPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
} catch (IOException ioe) {
throw new RuntimeException("MediaMuxer creation failed", ioe);
}
mTrackIndex = -1;
mMuxerStarted = false;
}
/**
* Releases encoder resources.
*/
private void releaseEncoder() {
if (VERBOSE) Log.d(TAG, "releasing encoder objects");
if (mEncoder != null) {
mEncoder.stop();
mEncoder.release();
mEncoder = null;
}
if (mInputSurface != null) {
mInputSurface.release();
mInputSurface = null;
}
if (mMuxer != null) {
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.
*/
private void drainEncoder(boolean endOfStream) {
final int TIMEOUT_USEC = 10000;
if (VERBOSE) Log.d(TAG, "drainEncoder(" + endOfStream + ")");
if (endOfStream) {
if (VERBOSE) Log.d(TAG, "sending EOS to encoder");
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 (VERBOSE) Log.d(TAG, "no output available, spinning to await EOS");
}
} 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();
Log.d(TAG, "encoder output format changed: " + newFormat);
// now that we have the Magic Goodies, start the muxer
mTrackIndex = mMuxer.addTrack(newFormat);
mMuxer.start();
mMuxerStarted = true;
} else if (encoderStatus < 0) {
Log.w(TAG, "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.
if (VERBOSE) Log.d(TAG, "ignoring BUFFER_FLAG_CODEC_CONFIG");
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);
if (VERBOSE) Log.d(TAG, "sent " + mBufferInfo.size + " bytes to muxer");
}
mEncoder.releaseOutputBuffer(encoderStatus, false);
if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
if (!endOfStream) {
Log.w(TAG, "reached end of stream unexpectedly");
} else {
if (VERBOSE) Log.d(TAG, "end of stream reached");
}
break; // out of while
}
}
}
}
/**
* Holds state associated with a Surface used for MediaCodec encoder input.
* <p>
* The constructor takes a Surface obtained from MediaCodec.createInputSurface(), and uses
* that to create an EGL window surface. Calls to eglSwapBuffers() cause a frame of data to
* be sent to the video encoder.
* <p>
* This object owns the Surface -- releasing this will release the Surface too.
*/
private static class CodecInputSurface {
private static final int EGL_RECORDABLE_ANDROID = 0x3142;
private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;
private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;
private EGLSurface mEGLSurface = EGL14.EGL_NO_SURFACE;
private Surface mSurface;
/**
* Creates a CodecInputSurface from a Surface.
*/
public CodecInputSurface(Surface surface) {
if (surface == null) {
throw new NullPointerException();
}
mSurface = surface;
eglSetup();
}
/**
* Prepares EGL. We want a GLES 2.0 context and a surface that supports recording.
*/
private void eglSetup() {
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)) {
throw new RuntimeException("unable to initialize EGL14");
}
// Configure EGL for recording and OpenGL ES 2.0.
int[] attribList = {
EGL14.EGL_RED_SIZE, 8,
EGL14.EGL_GREEN_SIZE, 8,
EGL14.EGL_BLUE_SIZE, 8,
EGL14.EGL_ALPHA_SIZE, 8,
EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
EGL_RECORDABLE_ANDROID, 1,
EGL14.EGL_NONE
};
EGLConfig[] configs = new EGLConfig[1];
int[] numConfigs = new int[1];
EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0, configs.length,
numConfigs, 0);
checkEglError("eglCreateContext RGB888+recordable ES2");
// Configure context for OpenGL ES 2.0.
int[] attrib_list = {
EGL14.EGL_CONTEXT_CLIENT_VERSION, 2,
EGL14.EGL_NONE
};
mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], EGL14.EGL_NO_CONTEXT,
attrib_list, 0);
checkEglError("eglCreateContext");
// Create a window surface, and attach it to the Surface we received.
int[] surfaceAttribs = {
EGL14.EGL_NONE
};
mEGLSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, configs[0], mSurface,
surfaceAttribs, 0);
checkEglError("eglCreateWindowSurface");
}
/**
* Discards all resources held by this class, notably the EGL context. Also releases the
* Surface that was passed to our constructor.
*/
public void release() {
if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
EGL14.EGL_NO_CONTEXT);
EGL14.eglDestroySurface(mEGLDisplay, mEGLSurface);
EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
EGL14.eglReleaseThread();
EGL14.eglTerminate(mEGLDisplay);
}
mSurface.release();
mEGLDisplay = EGL14.EGL_NO_DISPLAY;
mEGLContext = EGL14.EGL_NO_CONTEXT;
mEGLSurface = EGL14.EGL_NO_SURFACE;
mSurface = null;
}
/**
* Makes our EGL context and surface current.
*/
public void makeCurrent() {
EGL14.eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext);
checkEglError("eglMakeCurrent");
}
/**
* Calls eglSwapBuffers. Use this to "publish" the current frame.
*/
public boolean swapBuffers() {
boolean result = EGL14.eglSwapBuffers(mEGLDisplay, mEGLSurface);
checkEglError("eglSwapBuffers");
return result;
}
/**
* Sends the presentation time stamp to EGL. Time is expressed in nanoseconds.
*/
public void setPresentationTime(long nsecs) {
EGLExt.eglPresentationTimeANDROID(mEGLDisplay, mEGLSurface, nsecs);
checkEglError("eglPresentationTimeANDROID");
}
/**
* Checks for EGL errors. Throws an exception if one is found.
*/
private void checkEglError(String msg) {
int error;
if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));
}
}
}
/**
* Manages a SurfaceTexture. Creates SurfaceTexture and TextureRender objects, and provides
* functions that wait for frames and render them to the current EGL surface.
* <p>
* The SurfaceTexture can be passed to Camera.setPreviewTexture() to receive camera output.
*/
private static class SurfaceTextureManager
implements SurfaceTexture.OnFrameAvailableListener {
private SurfaceTexture mSurfaceTexture;
private CameraToMpegTest.STextureRender mTextureRender;
private Object mFrameSyncObject = new Object(); // guards mFrameAvailable
private boolean mFrameAvailable;
/**
* Creates instances of TextureRender and SurfaceTexture.
*/
public SurfaceTextureManager() {
mTextureRender = new CameraToMpegTest.STextureRender();
mTextureRender.surfaceCreated();
if (VERBOSE) Log.d(TAG, "textureID=" + mTextureRender.getTextureId());
mSurfaceTexture = new SurfaceTexture(mTextureRender.getTextureId());
// This doesn't work if this object is created on the thread that CTS started for
// these test cases.
//
// The CTS-created thread has a Looper, and the SurfaceTexture constructor will
// create a Handler that uses it. The "frame available" message is delivered
// there, but since we're not a Looper-based thread we'll never see it. For
// this to do anything useful, OutputSurface must be created on a thread without
// a Looper, so that SurfaceTexture uses the main application Looper instead.
//
// Java language note: passing "this" out of a constructor is generally unwise,
// but we should be able to get away with it here.
mSurfaceTexture.setOnFrameAvailableListener(this);
}
public void release() {
// this causes a bunch of warnings that appear harmless but might confuse someone:
// W BufferQueue: [unnamed-3997-2] cancelBuffer: BufferQueue has been abandoned!
//mSurfaceTexture.release();
mTextureRender = null;
mSurfaceTexture = null;
}
/**
* Returns the SurfaceTexture.
*/
public SurfaceTexture getSurfaceTexture() {
return mSurfaceTexture;
}
/**
* Replaces the fragment shader.
*/
public void changeFragmentShader(String fragmentShader) {
mTextureRender.changeFragmentShader(fragmentShader);
}
/**
* Latches the next buffer into the texture. Must be called from the thread that created
* the OutputSurface object.
*/
public void awaitNewImage() {
final int TIMEOUT_MS = 2500;
synchronized (mFrameSyncObject) {
while (!mFrameAvailable) {
try {
// Wait for onFrameAvailable() to signal us. Use a timeout to avoid
// stalling the test if it doesn't arrive.
mFrameSyncObject.wait(TIMEOUT_MS);
if (!mFrameAvailable) {
// TODO: if "spurious wakeup", continue while loop
throw new RuntimeException("Camera frame wait timed out");
}
} catch (InterruptedException ie) {
// shouldn't happen
throw new RuntimeException(ie);
}
}
mFrameAvailable = false;
}
// Latch the data.
mTextureRender.checkGlError("before updateTexImage");
mSurfaceTexture.updateTexImage();
}
/**
* Draws the data from SurfaceTexture onto the current EGL surface.
*/
public void drawImage() {
mTextureRender.drawFrame(mSurfaceTexture);
}
@Override
public void onFrameAvailable(SurfaceTexture st) {
if (VERBOSE) Log.d(TAG, "new frame available");
synchronized (mFrameSyncObject) {
if (mFrameAvailable) {
throw new RuntimeException("mFrameAvailable already set, frame could be dropped");
}
mFrameAvailable = true;
mFrameSyncObject.notifyAll();
}
}
}
/**
* Code for rendering a texture onto a surface using OpenGL ES 2.0.
*/
private static class STextureRender {
private static final int FLOAT_SIZE_BYTES = 4;
private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
private final float[] mTriangleVerticesData = {
// X, Y, Z, U, V
-1.0f, -1.0f, 0, 0.f, 0.f,
1.0f, -1.0f, 0, 1.f, 0.f,
-1.0f, 1.0f, 0, 0.f, 1.f,
1.0f, 1.0f, 0, 1.f, 1.f,
};
private FloatBuffer mTriangleVertices;
private static final String VERTEX_SHADER =
"uniform mat4 uMVPMatrix;\n" +
"uniform mat4 uSTMatrix;\n" +
"attribute vec4 aPosition;\n" +
"attribute vec4 aTextureCoord;\n" +
"varying vec2 vTextureCoord;\n" +
"void main() {\n" +
" gl_Position = uMVPMatrix * aPosition;\n" +
" vTextureCoord = (uSTMatrix * aTextureCoord).xy;\n" +
"}\n";
private static final String FRAGMENT_SHADER =
"#extension GL_OES_EGL_image_external : require\n" +
"precision mediump float;\n" + // highp here doesn't seem to matter
"varying vec2 vTextureCoord;\n" +
"uniform samplerExternalOES sTexture;\n" +
"void main() {\n" +
" gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
"}\n";
private float[] mMVPMatrix = new float[16];
private float[] mSTMatrix = new float[16];
private int mProgram;
private int mTextureID = -12345;
private int muMVPMatrixHandle;
private int muSTMatrixHandle;
private int maPositionHandle;
private int maTextureHandle;
public STextureRender() {
mTriangleVertices = ByteBuffer.allocateDirect(
mTriangleVerticesData.length * FLOAT_SIZE_BYTES)
.order(ByteOrder.nativeOrder()).asFloatBuffer();
mTriangleVertices.put(mTriangleVerticesData).position(0);
Matrix.setIdentityM(mSTMatrix, 0);
}
public int getTextureId() {
return mTextureID;
}
public void drawFrame(SurfaceTexture st) {
checkGlError("onDrawFrame start");
st.getTransformMatrix(mSTMatrix);
// (optional) clear to green so we can see if we're failing to set pixels
GLES20.glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
GLES20.glUseProgram(mProgram);
checkGlError("glUseProgram");
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
checkGlError("glVertexAttribPointer maPosition");
GLES20.glEnableVertexAttribArray(maPositionHandle);
checkGlError("glEnableVertexAttribArray maPositionHandle");
mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
checkGlError("glVertexAttribPointer maTextureHandle");
GLES20.glEnableVertexAttribArray(maTextureHandle);
checkGlError("glEnableVertexAttribArray maTextureHandle");
Matrix.setIdentityM(mMVPMatrix, 0);
GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
GLES20.glUniformMatrix4fv(muSTMatrixHandle, 1, false, mSTMatrix, 0);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
checkGlError("glDrawArrays");
// IMPORTANT: on some devices, if you are sharing the external texture between two
// contexts, one context may not see updates to the texture unless you un-bind and
// re-bind it. If you're not using shared EGL contexts, you don't need to bind
// texture 0 here.
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0);
}
/**
* Initializes GL state. Call this after the EGL surface has been created and made current.
*/
public void surfaceCreated() {
mProgram = createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
if (mProgram == 0) {
throw new RuntimeException("failed creating program");
}
maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
checkLocation(maPositionHandle, "aPosition");
maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
checkLocation(maTextureHandle, "aTextureCoord");
muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
checkLocation(muMVPMatrixHandle, "uMVPMatrix");
muSTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uSTMatrix");
checkLocation(muSTMatrixHandle, "uSTMatrix");
int[] textures = new int[1];
GLES20.glGenTextures(1, textures, 0);
mTextureID = textures[0];
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
checkGlError("glBindTexture mTextureID");
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER,
GLES20.GL_NEAREST);
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER,
GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S,
GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T,
GLES20.GL_CLAMP_TO_EDGE);
checkGlError("glTexParameter");
}
/**
* Replaces the fragment shader. Pass in null to reset to default.
*/
public void changeFragmentShader(String fragmentShader) {
if (fragmentShader == null) {
fragmentShader = FRAGMENT_SHADER;
}
GLES20.glDeleteProgram(mProgram);
mProgram = createProgram(VERTEX_SHADER, fragmentShader);
if (mProgram == 0) {
throw new RuntimeException("failed creating program");
}
}
private int loadShader(int shaderType, String source) {
int shader = GLES20.glCreateShader(shaderType);
checkGlError("glCreateShader type=" + shaderType);
GLES20.glShaderSource(shader, source);
GLES20.glCompileShader(shader);
int[] compiled = new int[1];
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0) {
Log.e(TAG, "Could not compile shader " + shaderType + ":");
Log.e(TAG, " " + GLES20.glGetShaderInfoLog(shader));
GLES20.glDeleteShader(shader);
shader = 0;
}
return shader;
}
private int createProgram(String vertexSource, String fragmentSource) {
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
if (vertexShader == 0) {
return 0;
}
int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
if (pixelShader == 0) {
return 0;
}
int program = GLES20.glCreateProgram();
if (program == 0) {
Log.e(TAG, "Could not create program");
}
GLES20.glAttachShader(program, vertexShader);
checkGlError("glAttachShader");
GLES20.glAttachShader(program, pixelShader);
checkGlError("glAttachShader");
GLES20.glLinkProgram(program);
int[] linkStatus = new int[1];
GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
if (linkStatus[0] != GLES20.GL_TRUE) {
Log.e(TAG, "Could not link program: ");
Log.e(TAG, GLES20.glGetProgramInfoLog(program));
GLES20.glDeleteProgram(program);
program = 0;
}
return program;
}
public void checkGlError(String op) {
int error;
while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
Log.e(TAG, op + ": glError " + error);
throw new RuntimeException(op + ": glError " + error);
}
}
public static void checkLocation(int location, String label) {
if (location < 0) {
throw new RuntimeException("Unable to locate '" + label + "' in program");
}
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment