| /* |
| * Copyright (C) 2011 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.graphics.Rect; |
| import android.os.Parcel; |
| import android.util.Log; |
| import java.util.HashMap; |
| import java.util.Set; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| /** |
| * Class to hold the timed text's metadata, including: |
| * <ul> |
| * <li> The characters for rendering</li> |
| * <li> The rendering position for the timed text</li> |
| * </ul> |
| * |
| * <p> To render the timed text, applications need to do the following: |
| * |
| * <ul> |
| * <li> Implement the {@link MediaPlayer.OnTimedTextListener} interface</li> |
| * <li> Register the {@link MediaPlayer.OnTimedTextListener} callback on a MediaPlayer object that is used for playback</li> |
| * <li> When a onTimedText callback is received, do the following: |
| * <ul> |
| * <li> call {@link #getText} to get the characters for rendering</li> |
| * <li> call {@link #getBounds} to get the text rendering area/region</li> |
| * </ul> |
| * </li> |
| * </ul> |
| * |
| * @see android.media.MediaPlayer |
| */ |
| public final class TimedText |
| { |
| private static final int FIRST_PUBLIC_KEY = 1; |
| |
| // These keys must be in sync with the keys in TextDescription.h |
| private static final int KEY_DISPLAY_FLAGS = 1; // int |
| private static final int KEY_STYLE_FLAGS = 2; // int |
| private static final int KEY_BACKGROUND_COLOR_RGBA = 3; // int |
| private static final int KEY_HIGHLIGHT_COLOR_RGBA = 4; // int |
| private static final int KEY_SCROLL_DELAY = 5; // int |
| private static final int KEY_WRAP_TEXT = 6; // int |
| private static final int KEY_START_TIME = 7; // int |
| private static final int KEY_STRUCT_BLINKING_TEXT_LIST = 8; // List<CharPos> |
| private static final int KEY_STRUCT_FONT_LIST = 9; // List<Font> |
| private static final int KEY_STRUCT_HIGHLIGHT_LIST = 10; // List<CharPos> |
| private static final int KEY_STRUCT_HYPER_TEXT_LIST = 11; // List<HyperText> |
| private static final int KEY_STRUCT_KARAOKE_LIST = 12; // List<Karaoke> |
| private static final int KEY_STRUCT_STYLE_LIST = 13; // List<Style> |
| private static final int KEY_STRUCT_TEXT_POS = 14; // TextPos |
| private static final int KEY_STRUCT_JUSTIFICATION = 15; // Justification |
| private static final int KEY_STRUCT_TEXT = 16; // Text |
| |
| private static final int LAST_PUBLIC_KEY = 16; |
| |
| private static final int FIRST_PRIVATE_KEY = 101; |
| |
| // The following keys are used between TimedText.java and |
| // TextDescription.cpp in order to parce the Parcel. |
| private static final int KEY_GLOBAL_SETTING = 101; |
| private static final int KEY_LOCAL_SETTING = 102; |
| private static final int KEY_START_CHAR = 103; |
| private static final int KEY_END_CHAR = 104; |
| private static final int KEY_FONT_ID = 105; |
| private static final int KEY_FONT_SIZE = 106; |
| private static final int KEY_TEXT_COLOR_RGBA = 107; |
| |
| private static final int LAST_PRIVATE_KEY = 107; |
| |
| private static final String TAG = "TimedText"; |
| |
| private final HashMap<Integer, Object> mKeyObjectMap = |
| new HashMap<Integer, Object>(); |
| |
| private int mDisplayFlags = -1; |
| private int mBackgroundColorRGBA = -1; |
| private int mHighlightColorRGBA = -1; |
| private int mScrollDelay = -1; |
| private int mWrapText = -1; |
| |
| private List<CharPos> mBlinkingPosList = null; |
| private List<CharPos> mHighlightPosList = null; |
| private List<Karaoke> mKaraokeList = null; |
| private List<Font> mFontList = null; |
| private List<Style> mStyleList = null; |
| private List<HyperText> mHyperTextList = null; |
| |
| private Rect mTextBounds = null; |
| private String mTextChars = null; |
| |
| private Justification mJustification; |
| |
| /** |
| * Helper class to hold the start char offset and end char offset |
| * for Blinking Text or Highlight Text. endChar is the end offset |
| * of the text (startChar + number of characters to be highlighted |
| * or blinked). The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class CharPos { |
| /** |
| * The offset of the start character |
| */ |
| public final int startChar; |
| |
| /** |
| * The offset of the end character |
| */ |
| public final int endChar; |
| |
| /** |
| * Constuctor |
| * @param startChar the offset of the start character. |
| * @param endChar the offset of the end character. |
| */ |
| public CharPos(int startChar, int endChar) { |
| this.startChar = startChar; |
| this.endChar = endChar; |
| } |
| } |
| |
| /** |
| * Helper class to hold the justification for text display in the text box. |
| * The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class Justification { |
| /** |
| * horizontal justification 0: left, 1: centered, -1: right |
| */ |
| public final int horizontalJustification; |
| |
| /** |
| * vertical justification 0: top, 1: centered, -1: bottom |
| */ |
| public final int verticalJustification; |
| |
| /** |
| * Constructor |
| * @param horizontal the horizontal justification of the text. |
| * @param vertical the vertical justification of the text. |
| */ |
| public Justification(int horizontal, int vertical) { |
| this.horizontalJustification = horizontal; |
| this.verticalJustification = vertical; |
| } |
| } |
| |
| /** |
| * Helper class to hold the style information to display the text. |
| * The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class Style { |
| /** |
| * The offset of the start character which applys this style |
| */ |
| public final int startChar; |
| |
| /** |
| * The offset of the end character which applys this style |
| */ |
| public final int endChar; |
| |
| /** |
| * ID of the font. This ID will be used to choose the font |
| * to be used from the font list. |
| */ |
| public final int fontID; |
| |
| /** |
| * True if the characters should be bold |
| */ |
| public final boolean isBold; |
| |
| /** |
| * True if the characters should be italic |
| */ |
| public final boolean isItalic; |
| |
| /** |
| * True if the characters should be underlined |
| */ |
| public final boolean isUnderlined; |
| |
| /** |
| * The size of the font |
| */ |
| public final int fontSize; |
| |
| /** |
| * To specify the RGBA color: 8 bits each of red, green, blue, |
| * and an alpha(transparency) value |
| */ |
| public final int colorRGBA; |
| |
| /** |
| * Constructor |
| * @param startChar the offset of the start character which applys this style |
| * @param endChar the offset of the end character which applys this style |
| * @param fontId the ID of the font. |
| * @param isBold whether the characters should be bold. |
| * @param isItalic whether the characters should be italic. |
| * @param isUnderlined whether the characters should be underlined. |
| * @param fontSize the size of the font. |
| * @param colorRGBA red, green, blue, and alpha value for color. |
| */ |
| public Style(int startChar, int endChar, int fontId, |
| boolean isBold, boolean isItalic, boolean isUnderlined, |
| int fontSize, int colorRGBA) { |
| this.startChar = startChar; |
| this.endChar = endChar; |
| this.fontID = fontId; |
| this.isBold = isBold; |
| this.isItalic = isItalic; |
| this.isUnderlined = isUnderlined; |
| this.fontSize = fontSize; |
| this.colorRGBA = colorRGBA; |
| } |
| } |
| |
| /** |
| * Helper class to hold the font ID and name. |
| * The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class Font { |
| /** |
| * The font ID |
| */ |
| public final int ID; |
| |
| /** |
| * The font name |
| */ |
| public final String name; |
| |
| /** |
| * Constructor |
| * @param id the font ID. |
| * @param name the font name. |
| */ |
| public Font(int id, String name) { |
| this.ID = id; |
| this.name = name; |
| } |
| } |
| |
| /** |
| * Helper class to hold the karaoke information. |
| * The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class Karaoke { |
| /** |
| * The start time (in milliseconds) to highlight the characters |
| * specified by startChar and endChar. |
| */ |
| public final int startTimeMs; |
| |
| /** |
| * The end time (in milliseconds) to highlight the characters |
| * specified by startChar and endChar. |
| */ |
| public final int endTimeMs; |
| |
| /** |
| * The offset of the start character to be highlighted |
| */ |
| public final int startChar; |
| |
| /** |
| * The offset of the end character to be highlighted |
| */ |
| public final int endChar; |
| |
| /** |
| * Constructor |
| * @param startTimeMs the start time (in milliseconds) to highlight |
| * the characters between startChar and endChar. |
| * @param endTimeMs the end time (in milliseconds) to highlight |
| * the characters between startChar and endChar. |
| * @param startChar the offset of the start character to be highlighted. |
| * @param endChar the offset of the end character to be highlighted. |
| */ |
| public Karaoke(int startTimeMs, int endTimeMs, int startChar, int endChar) { |
| this.startTimeMs = startTimeMs; |
| this.endTimeMs = endTimeMs; |
| this.startChar = startChar; |
| this.endChar = endChar; |
| } |
| } |
| |
| /** |
| * Helper class to hold the hyper text information. |
| * The member variables in this class are read-only. |
| * {@hide} |
| */ |
| public static final class HyperText { |
| /** |
| * The offset of the start character |
| */ |
| public final int startChar; |
| |
| /** |
| * The offset of the end character |
| */ |
| public final int endChar; |
| |
| /** |
| * The linked-to URL |
| */ |
| public final String URL; |
| |
| /** |
| * The "alt" string for user display |
| */ |
| public final String altString; |
| |
| |
| /** |
| * Constructor |
| * @param startChar the offset of the start character. |
| * @param endChar the offset of the end character. |
| * @param url the linked-to URL. |
| * @param alt the "alt" string for display. |
| */ |
| public HyperText(int startChar, int endChar, String url, String alt) { |
| this.startChar = startChar; |
| this.endChar = endChar; |
| this.URL = url; |
| this.altString = alt; |
| } |
| } |
| |
| /** |
| * @param obj the byte array which contains the timed text. |
| * @throws IllegalArgumentExcept if parseParcel() fails. |
| * {@hide} |
| */ |
| public TimedText(Parcel parcel) { |
| if (!parseParcel(parcel)) { |
| mKeyObjectMap.clear(); |
| throw new IllegalArgumentException("parseParcel() fails"); |
| } |
| } |
| |
| /** |
| * Get the characters in the timed text. |
| * |
| * @return the characters as a String object in the TimedText. Applications |
| * should stop rendering previous timed text at the current rendering region if |
| * a null is returned, until the next non-null timed text is received. |
| */ |
| public String getText() { |
| return mTextChars; |
| } |
| |
| /** |
| * Get the rectangle area or region for rendering the timed text as specified |
| * by a Rect object. |
| * |
| * @return the rectangle region to render the characters in the timed text. |
| * If no bounds information is available (a null is returned), render the |
| * timed text at the center bottom of the display. |
| */ |
| public Rect getBounds() { |
| return mTextBounds; |
| } |
| |
| /* |
| * Go over all the records, collecting metadata keys and fields in the |
| * Parcel. These are stored in mKeyObjectMap for application to retrieve. |
| * @return false if an error occurred during parsing. Otherwise, true. |
| */ |
| private boolean parseParcel(Parcel parcel) { |
| parcel.setDataPosition(0); |
| if (parcel.dataAvail() == 0) { |
| return false; |
| } |
| |
| int type = parcel.readInt(); |
| if (type == KEY_LOCAL_SETTING) { |
| type = parcel.readInt(); |
| if (type != KEY_START_TIME) { |
| return false; |
| } |
| int mStartTimeMs = parcel.readInt(); |
| mKeyObjectMap.put(type, mStartTimeMs); |
| |
| type = parcel.readInt(); |
| if (type != KEY_STRUCT_TEXT) { |
| return false; |
| } |
| |
| int textLen = parcel.readInt(); |
| byte[] text = parcel.createByteArray(); |
| if (text == null || text.length == 0) { |
| mTextChars = null; |
| } else { |
| mTextChars = new String(text); |
| } |
| |
| } else if (type != KEY_GLOBAL_SETTING) { |
| Log.w(TAG, "Invalid timed text key found: " + type); |
| return false; |
| } |
| |
| while (parcel.dataAvail() > 0) { |
| int key = parcel.readInt(); |
| if (!isValidKey(key)) { |
| Log.w(TAG, "Invalid timed text key found: " + key); |
| return false; |
| } |
| |
| Object object = null; |
| |
| switch (key) { |
| case KEY_STRUCT_STYLE_LIST: { |
| readStyle(parcel); |
| object = mStyleList; |
| break; |
| } |
| case KEY_STRUCT_FONT_LIST: { |
| readFont(parcel); |
| object = mFontList; |
| break; |
| } |
| case KEY_STRUCT_HIGHLIGHT_LIST: { |
| readHighlight(parcel); |
| object = mHighlightPosList; |
| break; |
| } |
| case KEY_STRUCT_KARAOKE_LIST: { |
| readKaraoke(parcel); |
| object = mKaraokeList; |
| break; |
| } |
| case KEY_STRUCT_HYPER_TEXT_LIST: { |
| readHyperText(parcel); |
| object = mHyperTextList; |
| |
| break; |
| } |
| case KEY_STRUCT_BLINKING_TEXT_LIST: { |
| readBlinkingText(parcel); |
| object = mBlinkingPosList; |
| |
| break; |
| } |
| case KEY_WRAP_TEXT: { |
| mWrapText = parcel.readInt(); |
| object = mWrapText; |
| break; |
| } |
| case KEY_HIGHLIGHT_COLOR_RGBA: { |
| mHighlightColorRGBA = parcel.readInt(); |
| object = mHighlightColorRGBA; |
| break; |
| } |
| case KEY_DISPLAY_FLAGS: { |
| mDisplayFlags = parcel.readInt(); |
| object = mDisplayFlags; |
| break; |
| } |
| case KEY_STRUCT_JUSTIFICATION: { |
| |
| int horizontal = parcel.readInt(); |
| int vertical = parcel.readInt(); |
| mJustification = new Justification(horizontal, vertical); |
| |
| object = mJustification; |
| break; |
| } |
| case KEY_BACKGROUND_COLOR_RGBA: { |
| mBackgroundColorRGBA = parcel.readInt(); |
| object = mBackgroundColorRGBA; |
| break; |
| } |
| case KEY_STRUCT_TEXT_POS: { |
| int top = parcel.readInt(); |
| int left = parcel.readInt(); |
| int bottom = parcel.readInt(); |
| int right = parcel.readInt(); |
| mTextBounds = new Rect(left, top, right, bottom); |
| |
| break; |
| } |
| case KEY_SCROLL_DELAY: { |
| mScrollDelay = parcel.readInt(); |
| object = mScrollDelay; |
| break; |
| } |
| default: { |
| break; |
| } |
| } |
| |
| if (object != null) { |
| if (mKeyObjectMap.containsKey(key)) { |
| mKeyObjectMap.remove(key); |
| } |
| // Previous mapping will be replaced with the new object, if there was one. |
| mKeyObjectMap.put(key, object); |
| } |
| } |
| |
| return true; |
| } |
| |
| /* |
| * To parse and store the Style list. |
| */ |
| private void readStyle(Parcel parcel) { |
| boolean endOfStyle = false; |
| int startChar = -1; |
| int endChar = -1; |
| int fontId = -1; |
| boolean isBold = false; |
| boolean isItalic = false; |
| boolean isUnderlined = false; |
| int fontSize = -1; |
| int colorRGBA = -1; |
| while (!endOfStyle && (parcel.dataAvail() > 0)) { |
| int key = parcel.readInt(); |
| switch (key) { |
| case KEY_START_CHAR: { |
| startChar = parcel.readInt(); |
| break; |
| } |
| case KEY_END_CHAR: { |
| endChar = parcel.readInt(); |
| break; |
| } |
| case KEY_FONT_ID: { |
| fontId = parcel.readInt(); |
| break; |
| } |
| case KEY_STYLE_FLAGS: { |
| int flags = parcel.readInt(); |
| // In the absence of any bits set in flags, the text |
| // is plain. Otherwise, 1: bold, 2: italic, 4: underline |
| isBold = ((flags % 2) == 1); |
| isItalic = ((flags % 4) >= 2); |
| isUnderlined = ((flags / 4) == 1); |
| break; |
| } |
| case KEY_FONT_SIZE: { |
| fontSize = parcel.readInt(); |
| break; |
| } |
| case KEY_TEXT_COLOR_RGBA: { |
| colorRGBA = parcel.readInt(); |
| break; |
| } |
| default: { |
| // End of the Style parsing. Reset the data position back |
| // to the position before the last parcel.readInt() call. |
| parcel.setDataPosition(parcel.dataPosition() - 4); |
| endOfStyle = true; |
| break; |
| } |
| } |
| } |
| |
| Style style = new Style(startChar, endChar, fontId, isBold, |
| isItalic, isUnderlined, fontSize, colorRGBA); |
| if (mStyleList == null) { |
| mStyleList = new ArrayList<Style>(); |
| } |
| mStyleList.add(style); |
| } |
| |
| /* |
| * To parse and store the Font list |
| */ |
| private void readFont(Parcel parcel) { |
| int entryCount = parcel.readInt(); |
| |
| for (int i = 0; i < entryCount; i++) { |
| int id = parcel.readInt(); |
| int nameLen = parcel.readInt(); |
| |
| byte[] text = parcel.createByteArray(); |
| final String name = new String(text, 0, nameLen); |
| |
| Font font = new Font(id, name); |
| |
| if (mFontList == null) { |
| mFontList = new ArrayList<Font>(); |
| } |
| mFontList.add(font); |
| } |
| } |
| |
| /* |
| * To parse and store the Highlight list |
| */ |
| private void readHighlight(Parcel parcel) { |
| int startChar = parcel.readInt(); |
| int endChar = parcel.readInt(); |
| CharPos pos = new CharPos(startChar, endChar); |
| |
| if (mHighlightPosList == null) { |
| mHighlightPosList = new ArrayList<CharPos>(); |
| } |
| mHighlightPosList.add(pos); |
| } |
| |
| /* |
| * To parse and store the Karaoke list |
| */ |
| private void readKaraoke(Parcel parcel) { |
| int entryCount = parcel.readInt(); |
| |
| for (int i = 0; i < entryCount; i++) { |
| int startTimeMs = parcel.readInt(); |
| int endTimeMs = parcel.readInt(); |
| int startChar = parcel.readInt(); |
| int endChar = parcel.readInt(); |
| Karaoke kara = new Karaoke(startTimeMs, endTimeMs, |
| startChar, endChar); |
| |
| if (mKaraokeList == null) { |
| mKaraokeList = new ArrayList<Karaoke>(); |
| } |
| mKaraokeList.add(kara); |
| } |
| } |
| |
| /* |
| * To parse and store HyperText list |
| */ |
| private void readHyperText(Parcel parcel) { |
| int startChar = parcel.readInt(); |
| int endChar = parcel.readInt(); |
| |
| int len = parcel.readInt(); |
| byte[] url = parcel.createByteArray(); |
| final String urlString = new String(url, 0, len); |
| |
| len = parcel.readInt(); |
| byte[] alt = parcel.createByteArray(); |
| final String altString = new String(alt, 0, len); |
| HyperText hyperText = new HyperText(startChar, endChar, urlString, altString); |
| |
| |
| if (mHyperTextList == null) { |
| mHyperTextList = new ArrayList<HyperText>(); |
| } |
| mHyperTextList.add(hyperText); |
| } |
| |
| /* |
| * To parse and store blinking text list |
| */ |
| private void readBlinkingText(Parcel parcel) { |
| int startChar = parcel.readInt(); |
| int endChar = parcel.readInt(); |
| CharPos blinkingPos = new CharPos(startChar, endChar); |
| |
| if (mBlinkingPosList == null) { |
| mBlinkingPosList = new ArrayList<CharPos>(); |
| } |
| mBlinkingPosList.add(blinkingPos); |
| } |
| |
| /* |
| * To check whether the given key is valid. |
| * @param key the key to be checked. |
| * @return true if the key is a valid one. Otherwise, false. |
| */ |
| private boolean isValidKey(final int key) { |
| if (!((key >= FIRST_PUBLIC_KEY) && (key <= LAST_PUBLIC_KEY)) |
| && !((key >= FIRST_PRIVATE_KEY) && (key <= LAST_PRIVATE_KEY))) { |
| return false; |
| } |
| return true; |
| } |
| |
| /* |
| * To check whether the given key is contained in this TimedText object. |
| * @param key the key to be checked. |
| * @return true if the key is contained in this TimedText object. |
| * Otherwise, false. |
| */ |
| private boolean containsKey(final int key) { |
| if (isValidKey(key) && mKeyObjectMap.containsKey(key)) { |
| return true; |
| } |
| return false; |
| } |
| |
| /* |
| * @return a set of the keys contained in this TimedText object. |
| */ |
| private Set keySet() { |
| return mKeyObjectMap.keySet(); |
| } |
| |
| /* |
| * To retrieve the object associated with the key. Caller must make sure |
| * the key is present using the containsKey method otherwise a |
| * RuntimeException will occur. |
| * @param key the key used to retrieve the object. |
| * @return an object. The object could be 1) an instance of Integer; 2) a |
| * List of CharPos, Karaoke, Font, Style, and HyperText, or 3) an instance of |
| * Justification. |
| */ |
| private Object getObject(final int key) { |
| if (containsKey(key)) { |
| return mKeyObjectMap.get(key); |
| } else { |
| throw new IllegalArgumentException("Invalid key: " + key); |
| } |
| } |
| } |
