/** Creates instances of CameraTextureRender and SurfaceTexture. */
public SurfaceTextureManager() {
textureRender = new CameraTextureRender();
textureRender.surfaceCreated();
logger.debug("textureID=" + textureRender.getTextureId());
surfaceTexture = new SurfaceTexture(textureRender.getTextureId());
surfaceTexture.setOnFrameAvailableListener(this);
}
@Override
public void onFrameAvailable(SurfaceTexture st) {
logger.trace("new frame available");
synchronized (frameSyncObject) {
if (frameAvailable) {
throw new RuntimeException("frameAvailable already set, frame could be dropped");
}
frameAvailable = true;
frameSyncObject.notifyAll();
}
}
/**
* Manages a SurfaceTexture. Creates SurfaceTexture and CameraTextureRender 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.
*/
public class SurfaceTextureManager implements SurfaceTexture.OnFrameAvailableListener {
/** The logger */
private static final Logger logger = Logger.getLogger(SurfaceTextureManager.class);
private SurfaceTexture surfaceTexture;
private CameraTextureRender textureRender;
/** guards frameAvailable */
private final Object frameSyncObject = new Object();
private boolean frameAvailable;
/** Creates instances of CameraTextureRender and SurfaceTexture. */
public SurfaceTextureManager() {
textureRender = new CameraTextureRender();
textureRender.surfaceCreated();
logger.debug("textureID=" + textureRender.getTextureId());
surfaceTexture = new SurfaceTexture(textureRender.getTextureId());
surfaceTexture.setOnFrameAvailableListener(this);
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public void release() {
if (textureRender != null) {
textureRender.release();
textureRender = null;
}
if (surfaceTexture != null) {
surfaceTexture.release();
surfaceTexture = null;
}
}
/** Returns the SurfaceTexture. */
public SurfaceTexture getSurfaceTexture() {
return surfaceTexture;
}
/**
* 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 (frameSyncObject) {
while (!frameAvailable) {
try {
// Wait for onFrameAvailable() to signal us. Use a timeout
// to avoid stalling the test if it doesn't arrive.
frameSyncObject.wait(TIMEOUT_MS);
if (!frameAvailable) {
// 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);
}
}
frameAvailable = false;
}
// Latch the data.
textureRender.checkGlError("before updateTexImage");
surfaceTexture.updateTexImage();
}
/** Draws the data from SurfaceTexture onto the current EGL surface. */
public void drawImage() {
textureRender.drawFrame(surfaceTexture);
}
@Override
public void onFrameAvailable(SurfaceTexture st) {
logger.trace("new frame available");
synchronized (frameSyncObject) {
if (frameAvailable) {
throw new RuntimeException("frameAvailable already set, frame could be dropped");
}
frameAvailable = true;
frameSyncObject.notifyAll();
}
}
}