/*
* 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);
}
}
}
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