import android.media.MediaPlayer.OnInfoListener;
import android.media.Metadata;
import android.media.SubtitleController;
+import android.media.SubtitleTrack.RenderingWidget;
import android.media.WebVttRenderer;
import android.net.Uri;
import android.util.AttributeSet;
import java.io.IOException;
import java.io.InputStream;
-import java.util.ArrayList;
import java.util.Map;
import java.util.Vector;
private boolean mCanSeekBack;
private boolean mCanSeekForward;
- /** List of views overlaid on top of the video. */
- private ArrayList<View> mOverlays;
+ /** Subtitle rendering widget overlaid on top of the video. */
+ private RenderingWidget mSubtitleWidget;
- /**
- * Listener for overlay layout changes. Invalidates the video view to ensure
- * that captions are redrawn whenever their layout changes.
- */
- private OnLayoutChangeListener mOverlayLayoutListener;
+ /** Listener for changes to subtitle data, used to redraw when needed. */
+ private RenderingWidget.OnChangedListener mSubtitlesChangedListener;
public VideoView(Context context) {
super(context);
mMediaPlayer = new MediaPlayer();
// TODO: create SubtitleController in MediaPlayer, but we need
// a context for the subtitle renderers
- SubtitleController controller = new SubtitleController(
- getContext(),
- mMediaPlayer.getMediaTimeProvider(),
- mMediaPlayer);
- controller.registerRenderer(new WebVttRenderer(getContext(), null));
+ final Context context = getContext();
+ final SubtitleController controller = new SubtitleController(
+ context, mMediaPlayer.getMediaTimeProvider(), mMediaPlayer);
+ controller.registerRenderer(new WebVttRenderer(context));
mMediaPlayer.setSubtitleAnchor(controller, this);
if (mAudioSession != 0) {
}
@Override
- protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
- super.onLayout(changed, left, top, right, bottom);
+ protected void onAttachedToWindow() {
+ super.onAttachedToWindow();
- // Layout overlay views, if necessary.
- if (changed && mOverlays != null && !mOverlays.isEmpty()) {
- measureAndLayoutOverlays();
+ if (mSubtitleWidget != null) {
+ mSubtitleWidget.onAttachedToWindow();
}
}
@Override
- public void draw(Canvas canvas) {
- super.draw(canvas);
+ protected void onDetachedFromWindow() {
+ super.onDetachedFromWindow();
- final int count = mOverlays.size();
- for (int i = 0; i < count; i++) {
- final View overlay = mOverlays.get(i);
- overlay.draw(canvas);
+ if (mSubtitleWidget != null) {
+ mSubtitleWidget.onDetachedFromWindow();
}
}
- /**
- * Adds a view to be overlaid on top of this video view. During layout, the
- * view will be forced to match the bounds, less padding, of the video view.
- * <p>
- * Overlays are drawn in the order they are added. The last added overlay
- * will be drawn on top.
- *
- * @param overlay the view to overlay
- * @see #removeOverlay(View)
- */
- private void addOverlay(View overlay) {
- if (mOverlays == null) {
- mOverlays = new ArrayList<View>(1);
- }
-
- if (mOverlayLayoutListener == null) {
- mOverlayLayoutListener = new OnLayoutChangeListener() {
- @Override
- public void onLayoutChange(View v, int left, int top, int right, int bottom,
- int oldLeft, int oldTop, int oldRight, int oldBottom) {
- invalidate();
- }
- };
- }
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ super.onLayout(changed, left, top, right, bottom);
- if (mOverlays.isEmpty()) {
- setWillNotDraw(false);
+ if (mSubtitleWidget != null) {
+ measureAndLayoutSubtitleWidget();
}
-
- mOverlays.add(overlay);
- overlay.addOnLayoutChangeListener(mOverlayLayoutListener);
- measureAndLayoutOverlays();
}
- /**
- * Removes a view previously added using {@link #addOverlay}.
- *
- * @param overlay the view to remove
- * @see #addOverlay(View)
- */
- private void removeOverlay(View overlay) {
- if (mOverlays == null) {
- return;
- }
-
- overlay.removeOnLayoutChangeListener(mOverlayLayoutListener);
- mOverlays.remove(overlay);
+ @Override
+ public void draw(Canvas canvas) {
+ super.draw(canvas);
- if (mOverlays.isEmpty()) {
- setWillNotDraw(true);
+ if (mSubtitleWidget != null) {
+ final int saveCount = canvas.save();
+ canvas.translate(getPaddingLeft(), getPaddingTop());
+ mSubtitleWidget.draw(canvas);
+ canvas.restoreToCount(saveCount);
}
-
- invalidate();
}
/**
* Forces a measurement and layout pass for all overlaid views.
*
- * @see #addOverlay(View)
+ * @see #setSubtitleWidget(RenderingWidget)
*/
- private void measureAndLayoutOverlays() {
- final int left = getPaddingLeft();
- final int top = getPaddingTop();
- final int right = getWidth() - left - getPaddingRight();
- final int bottom = getHeight() - top - getPaddingBottom();
- final int widthSpec = MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY);
- final int heightSpec = MeasureSpec.makeMeasureSpec(bottom - top, MeasureSpec.EXACTLY);
+ private void measureAndLayoutSubtitleWidget() {
+ final int width = getWidth() - getPaddingLeft() - getPaddingRight();
+ final int height = getHeight() - getPaddingTop() - getPaddingBottom();
- final int count = mOverlays.size();
- for (int i = 0; i < count; i++) {
- final View overlay = mOverlays.get(i);
- overlay.measure(widthSpec, heightSpec);
- overlay.layout(left, top, right, bottom);
- }
+ mSubtitleWidget.setSize(width, height);
}
/** @hide */
@Override
- public void setSubtitleView(View view) {
- if (mSubtitleView == view) {
+ public void setSubtitleWidget(RenderingWidget subtitleWidget) {
+ if (mSubtitleWidget == subtitleWidget) {
return;
}
- if (mSubtitleView != null) {
- removeOverlay(mSubtitleView);
+ final boolean attachedToWindow = isAttachedToWindow();
+ if (mSubtitleWidget != null) {
+ if (attachedToWindow) {
+ mSubtitleWidget.onDetachedFromWindow();
+ }
+
+ mSubtitleWidget.setOnChangedListener(null);
}
- mSubtitleView = view;
- if (mSubtitleView != null) {
- addOverlay(mSubtitleView);
+
+ mSubtitleWidget = subtitleWidget;
+
+ if (subtitleWidget != null) {
+ if (mSubtitlesChangedListener == null) {
+ mSubtitlesChangedListener = new RenderingWidget.OnChangedListener() {
+ @Override
+ public void onChanged(RenderingWidget renderingWidget) {
+ invalidate();
+ }
+ };
+ }
+
+ setWillNotDraw(false);
+ subtitleWidget.setOnChangedListener(mSubtitlesChangedListener);
+
+ if (attachedToWindow) {
+ subtitleWidget.onAttachedToWindow();
+ requestLayout();
+ }
+ } else {
+ setWillNotDraw(true);
}
- }
- private View mSubtitleView;
+ invalidate();
+ }
}
+/*
+ * Copyright (C) 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;
import android.content.Context;
+import android.text.SpannableStringBuilder;
+import android.util.ArrayMap;
import android.util.AttributeSet;
import android.util.Log;
+import android.view.Gravity;
import android.view.View;
-import android.view.ViewGroup.LayoutParams;
-import android.widget.TextView;
+import android.view.ViewGroup;
+import android.view.accessibility.CaptioningManager;
+import android.view.accessibility.CaptioningManager.CaptionStyle;
+import android.view.accessibility.CaptioningManager.CaptioningChangeListener;
+import android.widget.LinearLayout;
+
+import com.android.internal.widget.SubtitleView;
+import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/** @hide */
public class WebVttRenderer extends SubtitleController.Renderer {
- private TextView mMyTextView;
+ private final Context mContext;
- public WebVttRenderer(Context context, AttributeSet attrs) {
- mMyTextView = new WebVttView(context, attrs);
+ private WebVttRenderingWidget mRenderingWidget;
+
+ public WebVttRenderer(Context context) {
+ mContext = context;
}
@Override
@Override
public SubtitleTrack createTrack(MediaFormat format) {
- return new WebVttTrack(format, mMyTextView);
- }
-}
+ if (mRenderingWidget == null) {
+ mRenderingWidget = new WebVttRenderingWidget(mContext);
+ }
-/** @hide */
-class WebVttView extends TextView {
- public WebVttView(Context context, AttributeSet attrs) {
- super(context, attrs);
- setTextColor(0xffffff00);
- setTextSize(46);
- setTextAlignment(TextView.TEXT_ALIGNMENT_CENTER);
- setLayoutParams(new LayoutParams(
- LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
+ return new WebVttTrack(mRenderingWidget, format);
}
}
class WebVttTrack extends SubtitleTrack implements WebVttCueListener {
private static final String TAG = "WebVttTrack";
- private final TextView mTextView;
-
private final WebVttParser mParser = new WebVttParser(this);
private final UnstyledTextExtractor mExtractor =
new UnstyledTextExtractor();
private final Tokenizer mTokenizer = new Tokenizer(mExtractor);
private final Vector<Long> mTimestamps = new Vector<Long>();
+ private final WebVttRenderingWidget mRenderingWidget;
private final Map<String, TextTrackRegion> mRegions =
new HashMap<String, TextTrackRegion>();
private Long mCurrentRunID;
- WebVttTrack(MediaFormat format, TextView textView) {
+ WebVttTrack(WebVttRenderingWidget renderingWidget, MediaFormat format) {
super(format);
- mTextView = textView;
+
+ mRenderingWidget = renderingWidget;
}
@Override
- public View getView() {
- return mTextView;
+ public WebVttRenderingWidget getRenderingWidget() {
+ return mRenderingWidget;
}
@Override
}
}
+ @Override
public void updateView(Vector<SubtitleTrack.Cue> activeCues) {
if (!mVisible) {
// don't keep the state if we are not visible
Log.d(TAG, "at (illegal state) the active cues are:");
}
}
- StringBuilder text = new StringBuilder();
- StringBuilder lineBuilder = new StringBuilder();
- for (Cue o: activeCues) {
- TextTrackCue cue = (TextTrackCue)o;
- if (DEBUG) Log.d(TAG, cue.toString());
- for (TextTrackCueSpan[] line: cue.mLines) {
- for (TextTrackCueSpan span: line) {
- if (!span.mEnabled) {
- continue;
- }
- lineBuilder.append(span.mText);
+
+ mRenderingWidget.setActiveCues(activeCues);
+ }
+}
+
+/**
+ * Widget capable of rendering WebVTT captions.
+ *
+ * @hide
+ */
+class WebVttRenderingWidget extends ViewGroup implements SubtitleTrack.RenderingWidget {
+ private static final boolean DEBUG = false;
+ private static final int DEBUG_REGION_BACKGROUND = 0x800000FF;
+ private static final int DEBUG_CUE_BACKGROUND = 0x80FF0000;
+
+ /** WebVtt specifies line height as 5.3% of the viewport height. */
+ private static final float LINE_HEIGHT_RATIO = 0.0533f;
+
+ /** Map of active regions, used to determine enter/exit. */
+ private final ArrayMap<TextTrackRegion, RegionLayout> mRegionBoxes =
+ new ArrayMap<TextTrackRegion, RegionLayout>();
+
+ /** Map of active cues, used to determine enter/exit. */
+ private final ArrayMap<TextTrackCue, CueLayout> mCueBoxes =
+ new ArrayMap<TextTrackCue, CueLayout>();
+
+ /** Captioning manager, used to obtain and track caption properties. */
+ private final CaptioningManager mManager;
+
+ /** Callback for rendering changes. */
+ private OnChangedListener mListener;
+
+ /** Current caption style. */
+ private CaptionStyle mCaptionStyle;
+
+ /** Current font size, computed from font scaling factor and height. */
+ private float mFontSize;
+
+ /** Whether a caption style change listener is registered. */
+ private boolean mHasChangeListener;
+
+ public WebVttRenderingWidget(Context context) {
+ this(context, null);
+ }
+
+ public WebVttRenderingWidget(Context context, AttributeSet attrs) {
+ this(context, null, 0);
+ }
+
+ public WebVttRenderingWidget(Context context, AttributeSet attrs, int defStyle) {
+ super(context, attrs, defStyle);
+
+ // Cannot render text over video when layer type is hardware.
+ setLayerType(View.LAYER_TYPE_SOFTWARE, null);
+
+ mManager = (CaptioningManager) context.getSystemService(Context.CAPTIONING_SERVICE);
+ mCaptionStyle = mManager.getUserStyle();
+ mFontSize = mManager.getFontScale() * getHeight() * LINE_HEIGHT_RATIO;
+ }
+
+ @Override
+ public void setSize(int width, int height) {
+ final int widthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
+ final int heightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
+
+ measure(widthSpec, heightSpec);
+ layout(0, 0, width, height);
+ }
+
+ @Override
+ public void onAttachedToWindow() {
+ super.onAttachedToWindow();
+
+ manageChangeListener();
+ }
+
+ @Override
+ public void onDetachedFromWindow() {
+ super.onDetachedFromWindow();
+
+ manageChangeListener();
+ }
+
+ @Override
+ public void setOnChangedListener(OnChangedListener listener) {
+ mListener = listener;
+ }
+
+ @Override
+ public void setVisible(boolean visible) {
+ if (visible) {
+ setVisibility(View.VISIBLE);
+ } else {
+ setVisibility(View.GONE);
+ }
+
+ manageChangeListener();
+ }
+
+ /**
+ * Manages whether this renderer is listening for caption style changes.
+ */
+ private void manageChangeListener() {
+ final boolean needsListener = isAttachedToWindow() && getVisibility() == View.VISIBLE;
+ if (mHasChangeListener != needsListener) {
+ mHasChangeListener = needsListener;
+
+ if (needsListener) {
+ mManager.addCaptioningChangeListener(mCaptioningListener);
+
+ final CaptionStyle captionStyle = mManager.getUserStyle();
+ final float fontSize = mManager.getFontScale() * getHeight() * LINE_HEIGHT_RATIO;
+ setCaptionStyle(captionStyle, fontSize);
+ } else {
+ mManager.removeCaptioningChangeListener(mCaptioningListener);
+ }
+ }
+ }
+
+ public void setActiveCues(Vector<SubtitleTrack.Cue> activeCues) {
+ final Context context = getContext();
+ final CaptionStyle captionStyle = mCaptionStyle;
+ final float fontSize = mFontSize;
+
+ prepForPrune();
+
+ // Ensure we have all necessary cue and region boxes.
+ final int count = activeCues.size();
+ for (int i = 0; i < count; i++) {
+ final TextTrackCue cue = (TextTrackCue) activeCues.get(i);
+ final TextTrackRegion region = cue.mRegion;
+ if (region != null) {
+ RegionLayout regionBox = mRegionBoxes.get(region);
+ if (regionBox == null) {
+ regionBox = new RegionLayout(context, region, captionStyle, fontSize);
+ mRegionBoxes.put(region, regionBox);
+ addView(regionBox, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
- if (lineBuilder.length() > 0) {
- text.append(lineBuilder.toString()).append("\n");
- lineBuilder.delete(0, lineBuilder.length());
+ regionBox.put(cue);
+ } else {
+ CueLayout cueBox = mCueBoxes.get(cue);
+ if (cueBox == null) {
+ cueBox = new CueLayout(context, cue, captionStyle, fontSize);
+ mCueBoxes.put(cue, cueBox);
+ addView(cueBox, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
+ cueBox.update();
+ cueBox.setOrder(i);
+ }
+ }
+
+ prune();
+
+ // Force measurement and layout.
+ final int width = getWidth();
+ final int height = getHeight();
+ setSize(width, height);
+
+ if (mListener != null) {
+ mListener.onChanged(this);
+ }
+ }
+
+ private void setCaptionStyle(CaptionStyle captionStyle, float fontSize) {
+ mCaptionStyle = captionStyle;
+ mFontSize = fontSize;
+
+ final int cueCount = mCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mCueBoxes.valueAt(i);
+ cueBox.setCaptionStyle(captionStyle, fontSize);
+ }
+
+ final int regionCount = mRegionBoxes.size();
+ for (int i = 0; i < regionCount; i++) {
+ final RegionLayout regionBox = mRegionBoxes.valueAt(i);
+ regionBox.setCaptionStyle(captionStyle, fontSize);
+ }
+ }
+
+ /**
+ * Remove inactive cues and regions.
+ */
+ private void prune() {
+ int regionCount = mRegionBoxes.size();
+ for (int i = 0; i < regionCount; i++) {
+ final RegionLayout regionBox = mRegionBoxes.valueAt(i);
+ if (regionBox.prune()) {
+ removeView(regionBox);
+ mRegionBoxes.removeAt(i);
+ regionCount--;
+ i--;
}
}
- if (mTextView != null) {
- if (DEBUG) Log.d(TAG, "updating to " + text.toString());
- mTextView.setText(text.toString());
- mTextView.postInvalidate();
+ int cueCount = mCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mCueBoxes.valueAt(i);
+ if (!cueBox.isActive()) {
+ removeView(cueBox);
+ mCueBoxes.removeAt(i);
+ cueCount--;
+ i--;
+ }
+ }
+ }
+
+ /**
+ * Reset active cues and regions.
+ */
+ private void prepForPrune() {
+ final int regionCount = mRegionBoxes.size();
+ for (int i = 0; i < regionCount; i++) {
+ final RegionLayout regionBox = mRegionBoxes.valueAt(i);
+ regionBox.prepForPrune();
+ }
+
+ final int cueCount = mCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mCueBoxes.valueAt(i);
+ cueBox.prepForPrune();
+ }
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+ final int regionCount = mRegionBoxes.size();
+ for (int i = 0; i < regionCount; i++) {
+ final RegionLayout regionBox = mRegionBoxes.valueAt(i);
+ regionBox.measureForParent(widthMeasureSpec, heightMeasureSpec);
+ }
+
+ final int cueCount = mCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mCueBoxes.valueAt(i);
+ cueBox.measureForParent(widthMeasureSpec, heightMeasureSpec);
+ }
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
+ final int viewportWidth = r - l;
+ final int viewportHeight = b - t;
+
+ setCaptionStyle(mCaptionStyle,
+ mManager.getFontScale() * LINE_HEIGHT_RATIO * viewportHeight);
+
+ final int regionCount = mRegionBoxes.size();
+ for (int i = 0; i < regionCount; i++) {
+ final RegionLayout regionBox = mRegionBoxes.valueAt(i);
+ layoutRegion(viewportWidth, viewportHeight, regionBox);
+ }
+
+ final int cueCount = mCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mCueBoxes.valueAt(i);
+ layoutCue(viewportWidth, viewportHeight, cueBox);
+ }
+ }
+
+ /**
+ * Lays out a region within the viewport. The region handles layout for
+ * contained cues.
+ */
+ private void layoutRegion(
+ int viewportWidth, int viewportHeight,
+ RegionLayout regionBox) {
+ final TextTrackRegion region = regionBox.getRegion();
+ final int regionHeight = regionBox.getMeasuredHeight();
+ final int regionWidth = regionBox.getMeasuredWidth();
+
+ // TODO: Account for region anchor point.
+ final float x = region.mViewportAnchorPointX;
+ final float y = region.mViewportAnchorPointY;
+ final int left = (int) (x * (viewportWidth - regionWidth) / 100);
+ final int top = (int) (y * (viewportHeight - regionHeight) / 100);
+
+ regionBox.layout(left, top, left + regionWidth, top + regionHeight);
+ }
+
+ /**
+ * Lays out a cue within the viewport.
+ */
+ private void layoutCue(
+ int viewportWidth, int viewportHeight, CueLayout cueBox) {
+ final TextTrackCue cue = cueBox.getCue();
+ final int direction = getLayoutDirection();
+ final int absAlignment = resolveCueAlignment(direction, cue.mAlignment);
+ final boolean cueSnapToLines = cue.mSnapToLines;
+
+ int size = 100 * cueBox.getMeasuredWidth() / viewportWidth;
+
+ // Determine raw x-position.
+ int xPosition;
+ switch (absAlignment) {
+ case TextTrackCue.ALIGNMENT_LEFT:
+ xPosition = cue.mTextPosition;
+ break;
+ case TextTrackCue.ALIGNMENT_RIGHT:
+ xPosition = cue.mTextPosition - size;
+ break;
+ case TextTrackCue.ALIGNMENT_MIDDLE:
+ default:
+ xPosition = cue.mTextPosition - size / 2;
+ break;
+ }
+
+ // Adjust x-position for layout.
+ if (direction == LAYOUT_DIRECTION_RTL) {
+ xPosition = 100 - xPosition;
+ }
+
+ // If the text track cue snap-to-lines flag is set, adjust
+ // x-position and size for padding. This is equivalent to placing the
+ // cue within the title-safe area.
+ if (cueSnapToLines) {
+ final int paddingLeft = 100 * getPaddingLeft() / viewportWidth;
+ final int paddingRight = 100 * getPaddingRight() / viewportWidth;
+ if (xPosition < paddingLeft && xPosition + size > paddingLeft) {
+ xPosition += paddingLeft;
+ size -= paddingLeft;
+ }
+ final float rightEdge = 100 - paddingRight;
+ if (xPosition < rightEdge && xPosition + size > rightEdge) {
+ size -= paddingRight;
+ }
+ }
+
+ // Compute absolute left position and width.
+ final int left = xPosition * viewportWidth / 100;
+ final int width = size * viewportWidth / 100;
+
+ // Determine initial y-position.
+ final int yPosition = calculateLinePosition(cueBox);
+
+ // Compute absolute final top position and height.
+ final int height = cueBox.getMeasuredHeight();
+ final int top;
+ if (yPosition < 0) {
+ // TODO: This needs to use the actual height of prior boxes.
+ top = viewportHeight + yPosition * height;
+ } else {
+ top = yPosition * (viewportHeight - height) / 100;
+ }
+
+ // Layout cue in final position.
+ cueBox.layout(left, top, left + width, top + height);
+ }
+
+ /**
+ * Calculates the line position for a cue.
+ * <p>
+ * If the resulting position is negative, it represents a bottom-aligned
+ * position relative to the number of active cues. Otherwise, it represents
+ * a percentage [0-100] of the viewport height.
+ */
+ private int calculateLinePosition(CueLayout cueBox) {
+ final TextTrackCue cue = cueBox.getCue();
+ final Integer linePosition = cue.mLinePosition;
+ final boolean snapToLines = cue.mSnapToLines;
+ final boolean autoPosition = (linePosition == null);
+
+ if (!snapToLines && !autoPosition && (linePosition < 0 || linePosition > 100)) {
+ // Invalid line position defaults to 100.
+ return 100;
+ } else if (!autoPosition) {
+ // Use the valid, supplied line position.
+ return linePosition;
+ } else if (!snapToLines) {
+ // Automatic, non-snapped line position defaults to 100.
+ return 100;
+ } else {
+ // Automatic snapped line position uses active cue order.
+ return -(cueBox.mOrder + 1);
+ }
+ }
+
+ /**
+ * Resolves cue alignment according to the specified layout direction.
+ */
+ private static int resolveCueAlignment(int layoutDirection, int alignment) {
+ switch (alignment) {
+ case TextTrackCue.ALIGNMENT_START:
+ return layoutDirection == View.LAYOUT_DIRECTION_LTR ?
+ TextTrackCue.ALIGNMENT_LEFT : TextTrackCue.ALIGNMENT_RIGHT;
+ case TextTrackCue.ALIGNMENT_END:
+ return layoutDirection == View.LAYOUT_DIRECTION_LTR ?
+ TextTrackCue.ALIGNMENT_RIGHT : TextTrackCue.ALIGNMENT_LEFT;
+ }
+ return alignment;
+ }
+
+ private final CaptioningChangeListener mCaptioningListener = new CaptioningChangeListener() {
+ @Override
+ public void onFontScaleChanged(float fontScale) {
+ final float fontSize = fontScale * getHeight() * LINE_HEIGHT_RATIO;
+ setCaptionStyle(mCaptionStyle, fontSize);
+ }
+
+ @Override
+ public void onUserStyleChanged(CaptionStyle userStyle) {
+ setCaptionStyle(userStyle, mFontSize);
+ }
+ };
+
+ /**
+ * A text track region represents a portion of the video viewport and
+ * provides a rendering area for text track cues.
+ */
+ private static class RegionLayout extends LinearLayout {
+ private final ArrayList<CueLayout> mRegionCueBoxes = new ArrayList<CueLayout>();
+ private final TextTrackRegion mRegion;
+
+ private CaptionStyle mCaptionStyle;
+ private float mFontSize;
+
+ public RegionLayout(Context context, TextTrackRegion region, CaptionStyle captionStyle,
+ float fontSize) {
+ super(context);
+
+ mRegion = region;
+ mCaptionStyle = captionStyle;
+ mFontSize = fontSize;
+
+ // TODO: Add support for vertical text
+ setOrientation(VERTICAL);
+
+ if (DEBUG) {
+ setBackgroundColor(DEBUG_REGION_BACKGROUND);
+ }
+ }
+
+ public void setCaptionStyle(CaptionStyle captionStyle, float fontSize) {
+ mCaptionStyle = captionStyle;
+ mFontSize = fontSize;
+
+ final int cueCount = mRegionCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mRegionCueBoxes.get(i);
+ cueBox.setCaptionStyle(captionStyle, fontSize);
+ }
+ }
+
+ /**
+ * Performs the parent's measurement responsibilities, then
+ * automatically performs its own measurement.
+ */
+ public void measureForParent(int widthMeasureSpec, int heightMeasureSpec) {
+ final TextTrackRegion region = mRegion;
+ final int specWidth = MeasureSpec.getSize(widthMeasureSpec);
+ final int specHeight = MeasureSpec.getSize(heightMeasureSpec);
+ final int width = (int) region.mWidth;
+
+ // Determine the absolute maximum region size as the requested size.
+ final int size = width * specWidth / 100;
+
+ widthMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.AT_MOST);
+ heightMeasureSpec = MeasureSpec.makeMeasureSpec(specHeight, MeasureSpec.AT_MOST);
+ measure(widthMeasureSpec, heightMeasureSpec);
+ }
+
+ /**
+ * Prepares this region for pruning by setting all tracks as inactive.
+ * <p>
+ * Tracks that are added or updated using {@link #put(TextTrackCue)}
+ * after this calling this method will be marked as active.
+ */
+ public void prepForPrune() {
+ final int cueCount = mRegionCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mRegionCueBoxes.get(i);
+ cueBox.prepForPrune();
+ }
+ }
+
+ /**
+ * Adds a {@link TextTrackCue} to this region. If the track had already
+ * been added, updates its active state.
+ *
+ * @param cue
+ */
+ public void put(TextTrackCue cue) {
+ final int cueCount = mRegionCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mRegionCueBoxes.get(i);
+ if (cueBox.getCue() == cue) {
+ cueBox.update();
+ return;
+ }
+ }
+
+ final CueLayout cueBox = new CueLayout(getContext(), cue, mCaptionStyle, mFontSize);
+ addView(cueBox, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
+
+ if (getChildCount() > mRegion.mLines) {
+ removeViewAt(0);
+ }
+ }
+
+ /**
+ * Remove all inactive tracks from this region.
+ *
+ * @return true if this region is empty and should be pruned
+ */
+ public boolean prune() {
+ int cueCount = mRegionCueBoxes.size();
+ for (int i = 0; i < cueCount; i++) {
+ final CueLayout cueBox = mRegionCueBoxes.get(i);
+ if (!cueBox.isActive()) {
+ mRegionCueBoxes.remove(i);
+ removeView(cueBox);
+ cueCount--;
+ i--;
+ }
+ }
+
+ return mRegionCueBoxes.isEmpty();
+ }
+
+ /**
+ * @return the region data backing this layout
+ */
+ public TextTrackRegion getRegion() {
+ return mRegion;
+ }
+ }
+
+ /**
+ * A text track cue is the unit of time-sensitive data in a text track,
+ * corresponding for instance for subtitles and captions to the text that
+ * appears at a particular time and disappears at another time.
+ * <p>
+ * A single cue may contain multiple {@link SpanLayout}s, each representing a
+ * single line of text.
+ */
+ private static class CueLayout extends LinearLayout {
+ public final TextTrackCue mCue;
+
+ private CaptionStyle mCaptionStyle;
+ private float mFontSize;
+
+ private boolean mActive;
+ private int mOrder;
+
+ public CueLayout(
+ Context context, TextTrackCue cue, CaptionStyle captionStyle, float fontSize) {
+ super(context);
+
+ mCue = cue;
+ mCaptionStyle = captionStyle;
+ mFontSize = fontSize;
+
+ // TODO: Add support for vertical text.
+ final boolean horizontal = cue.mWritingDirection
+ == TextTrackCue.WRITING_DIRECTION_HORIZONTAL;
+ setOrientation(horizontal ? VERTICAL : HORIZONTAL);
+
+ switch (cue.mAlignment) {
+ case TextTrackCue.ALIGNMENT_END:
+ setGravity(Gravity.END);
+ break;
+ case TextTrackCue.ALIGNMENT_LEFT:
+ setGravity(Gravity.LEFT);
+ break;
+ case TextTrackCue.ALIGNMENT_MIDDLE:
+ setGravity(horizontal
+ ? Gravity.CENTER_HORIZONTAL : Gravity.CENTER_VERTICAL);
+ break;
+ case TextTrackCue.ALIGNMENT_RIGHT:
+ setGravity(Gravity.RIGHT);
+ break;
+ case TextTrackCue.ALIGNMENT_START:
+ setGravity(Gravity.START);
+ break;
+ }
+
+ if (DEBUG) {
+ setBackgroundColor(DEBUG_CUE_BACKGROUND);
+ }
+
+ update();
+ }
+
+ public void setCaptionStyle(CaptionStyle style, float fontSize) {
+ mCaptionStyle = style;
+ mFontSize = fontSize;
+
+ final int n = getChildCount();
+ for (int i = 0; i < n; i++) {
+ final View child = getChildAt(i);
+ if (child instanceof SpanLayout) {
+ ((SpanLayout) child).setCaptionStyle(style, fontSize);
+ }
+ }
+ }
+
+ public void prepForPrune() {
+ mActive = false;
+ }
+
+ public void update() {
+ mActive = true;
+
+ removeAllViews();
+
+ final CaptionStyle captionStyle = mCaptionStyle;
+ final float fontSize = mFontSize;
+ final TextTrackCueSpan[][] lines = mCue.mLines;
+ final int lineCount = lines.length;
+ for (int i = 0; i < lineCount; i++) {
+ final SpanLayout lineBox = new SpanLayout(getContext(), lines[i]);
+ lineBox.setCaptionStyle(captionStyle, fontSize);
+
+ addView(lineBox, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
+ }
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ }
+
+ /**
+ * Performs the parent's measurement responsibilities, then
+ * automatically performs its own measurement.
+ */
+ public void measureForParent(int widthMeasureSpec, int heightMeasureSpec) {
+ final TextTrackCue cue = mCue;
+ final int specWidth = MeasureSpec.getSize(widthMeasureSpec);
+ final int specHeight = MeasureSpec.getSize(heightMeasureSpec);
+ final int direction = getLayoutDirection();
+ final int absAlignment = resolveCueAlignment(direction, cue.mAlignment);
+
+ // Determine the maximum size of cue based on its starting position
+ // and the direction in which it grows.
+ final int maximumSize;
+ switch (absAlignment) {
+ case TextTrackCue.ALIGNMENT_LEFT:
+ maximumSize = 100 - cue.mTextPosition;
+ break;
+ case TextTrackCue.ALIGNMENT_RIGHT:
+ maximumSize = cue.mTextPosition;
+ break;
+ case TextTrackCue.ALIGNMENT_MIDDLE:
+ if (cue.mTextPosition <= 50) {
+ maximumSize = cue.mTextPosition * 2;
+ } else {
+ maximumSize = (100 - cue.mTextPosition) * 2;
+ }
+ break;
+ default:
+ maximumSize = 0;
+ }
+
+ // Determine absolute maximum cue size as the smaller of the
+ // requested size and the maximum theoretical size.
+ final int size = Math.min(cue.mSize, maximumSize) * specWidth / 100;
+ widthMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.AT_MOST);
+ heightMeasureSpec = MeasureSpec.makeMeasureSpec(specHeight, MeasureSpec.AT_MOST);
+ measure(widthMeasureSpec, heightMeasureSpec);
+ }
+
+ /**
+ * Sets the order of this cue in the list of active cues.
+ *
+ * @param order the order of this cue in the list of active cues
+ */
+ public void setOrder(int order) {
+ mOrder = order;
+ }
+
+ /**
+ * @return whether this cue is marked as active
+ */
+ public boolean isActive() {
+ return mActive;
+ }
+
+ /**
+ * @return the cue data backing this layout
+ */
+ public TextTrackCue getCue() {
+ return mCue;
+ }
+ }
+
+ /**
+ * A text track line represents a single line of text within a cue.
+ * <p>
+ * A single line may contain multiple spans, each representing a section of
+ * text that may be enabled or disabled at a particular time.
+ */
+ private static class SpanLayout extends SubtitleView {
+ private final SpannableStringBuilder mBuilder = new SpannableStringBuilder();
+ private final TextTrackCueSpan[] mSpans;
+
+ public SpanLayout(Context context, TextTrackCueSpan[] spans) {
+ super(context);
+
+ mSpans = spans;
+
+ update();
+ }
+
+ public void update() {
+ final SpannableStringBuilder builder = mBuilder;
+ final TextTrackCueSpan[] spans = mSpans;
+
+ builder.clear();
+ builder.clearSpans();
+
+ final int spanCount = spans.length;
+ for (int i = 0; i < spanCount; i++) {
+ final TextTrackCueSpan span = spans[i];
+ if (span.mEnabled) {
+ builder.append(spans[i].mText);
+ }
+ }
+
+ setText(builder);
+ }
+
+ public void setCaptionStyle(CaptionStyle captionStyle, float fontSize) {
+ setBackgroundColor(captionStyle.backgroundColor);
+ setForegroundColor(captionStyle.foregroundColor);
+ setEdgeColor(captionStyle.edgeColor);
+ setEdgeType(captionStyle.edgeType);
+ setTypeface(captionStyle.getTypeface());
+ setTextSize(fontSize);
}
}
}
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