/* * Copyright (C) 2016 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 com.google.android.exoplayer2.util; import static android.content.Context.UI_MODE_SERVICE; import android.Manifest.permission; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.app.Activity; import android.app.UiModeManager; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.content.res.Configuration; import android.content.res.Resources; import android.graphics.Point; import android.media.AudioFormat; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.Uri; import android.os.Build; import android.os.Handler; import android.os.Looper; import android.os.Parcel; import android.security.NetworkSecurityPolicy; import android.telephony.TelephonyManager; import android.text.TextUtils; import android.view.Display; import android.view.WindowManager; import androidx.annotation.Nullable; import com.google.android.exoplayer2.C; import com.google.android.exoplayer2.ExoPlayerLibraryInfo; import com.google.android.exoplayer2.Format; import com.google.android.exoplayer2.ParserException; import com.google.android.exoplayer2.Renderer; import com.google.android.exoplayer2.RendererCapabilities; import com.google.android.exoplayer2.RenderersFactory; import com.google.android.exoplayer2.SeekParameters; import com.google.android.exoplayer2.audio.AudioRendererEventListener; import com.google.android.exoplayer2.drm.DrmSessionManager; import com.google.android.exoplayer2.drm.FrameworkMediaCrypto; import com.google.android.exoplayer2.upstream.DataSource; import com.google.android.exoplayer2.video.VideoRendererEventListener; import java.io.ByteArrayOutputStream; import java.io.Closeable; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.Method; import java.math.BigDecimal; import java.nio.charset.Charset; import java.util.Arrays; import java.util.Calendar; import java.util.Collections; import java.util.Formatter; import java.util.GregorianCalendar; import java.util.HashMap; import java.util.List; import java.util.Locale; import java.util.MissingResourceException; import java.util.TimeZone; import java.util.UUID; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.regex.Matcher; import java.util.regex.Pattern; import java.util.zip.DataFormatException; import java.util.zip.Inflater; import org.checkerframework.checker.initialization.qual.UnknownInitialization; import org.checkerframework.checker.nullness.compatqual.NullableType; import org.checkerframework.checker.nullness.qual.EnsuresNonNull; import org.checkerframework.checker.nullness.qual.PolyNull; /** * Miscellaneous utility methods. */ public final class Util { /** * Like {@link Build.VERSION#SDK_INT}, but in a place where it can be conveniently * overridden for local testing. */ public static final int SDK_INT = Build.VERSION.SDK_INT; /** * Like {@link Build#DEVICE}, but in a place where it can be conveniently overridden for local * testing. */ public static final String DEVICE = Build.DEVICE; /** * Like {@link Build#MANUFACTURER}, but in a place where it can be conveniently overridden for * local testing. */ public static final String MANUFACTURER = Build.MANUFACTURER; /** * Like {@link Build#MODEL}, but in a place where it can be conveniently overridden for local * testing. */ public static final String MODEL = Build.MODEL; /** * A concise description of the device that it can be useful to log for debugging purposes. */ public static final String DEVICE_DEBUG_INFO = DEVICE + ", " + MODEL + ", " + MANUFACTURER + ", " + SDK_INT; /** An empty byte array. */ public static final byte[] EMPTY_BYTE_ARRAY = new byte[0]; private static final String TAG = "Util"; private static final Pattern XS_DATE_TIME_PATTERN = Pattern.compile( "(\\d\\d\\d\\d)\\-(\\d\\d)\\-(\\d\\d)[Tt]" + "(\\d\\d):(\\d\\d):(\\d\\d)([\\.,](\\d+))?" + "([Zz]|((\\+|\\-)(\\d?\\d):?(\\d\\d)))?"); private static final Pattern XS_DURATION_PATTERN = Pattern.compile("^(-)?P(([0-9]*)Y)?(([0-9]*)M)?(([0-9]*)D)?" + "(T(([0-9]*)H)?(([0-9]*)M)?(([0-9.]*)S)?)?$"); private static final Pattern ESCAPED_CHARACTER_PATTERN = Pattern.compile("%([A-Fa-f0-9]{2})"); // Android standardizes to ISO 639-1 2-letter codes and provides no way to map a 3-letter // ISO 639-2 code back to the corresponding 2-letter code. @Nullable private static HashMap<String, String> languageTagIso3ToIso2; private Util() {} /** * Converts the entirety of an {@link InputStream} to a byte array. * * @param inputStream the {@link InputStream} to be read. The input stream is not closed by this * method. * @return a byte array containing all of the inputStream's bytes. * @throws IOException if an error occurs reading from the stream. */ public static byte[] toByteArray(InputStream inputStream) throws IOException { byte[] buffer = new byte[1024 * 4]; ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); int bytesRead; while ((bytesRead = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } return outputStream.toByteArray(); } /** * Calls {@link Context#startForegroundService(Intent)} if {@link #SDK_INT} is 26 or higher, or * {@link Context#startService(Intent)} otherwise. * * @param context The context to call. * @param intent The intent to pass to the called method. * @return The result of the called method. */ @Nullable public static ComponentName startForegroundService(Context context, Intent intent) { if (Util.SDK_INT >= 26) { return context.startForegroundService(intent); } else { return context.startService(intent); } } /** * Checks whether it's necessary to request the {@link permission#READ_EXTERNAL_STORAGE} * permission read the specified {@link Uri}s, requesting the permission if necessary. * * @param activity The host activity for checking and requesting the permission. * @param uris {@link Uri}s that may require {@link permission#READ_EXTERNAL_STORAGE} to read. * @return Whether a permission request was made. */ @TargetApi(23) public static boolean maybeRequestReadExternalStoragePermission(Activity activity, Uri... uris) { if (Util.SDK_INT < 23) { return false; } for (Uri uri : uris) { if (isLocalFileUri(uri)) { if (activity.checkSelfPermission(permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { activity.requestPermissions(new String[] {permission.READ_EXTERNAL_STORAGE}, 0); return true; } break; } } return false; } /** * Returns whether it may be possible to load the given URIs based on the network security * policy's cleartext traffic permissions. * * @param uris A list of URIs that will be loaded. * @return Whether it may be possible to load the given URIs. */ @TargetApi(24) public static boolean checkCleartextTrafficPermitted(Uri... uris) { if (Util.SDK_INT < 24) { // We assume cleartext traffic is permitted. return true; } for (Uri uri : uris) { if ("http".equals(uri.getScheme()) && !NetworkSecurityPolicy.getInstance() .isCleartextTrafficPermitted(Assertions.checkNotNull(uri.getHost()))) { // The security policy prevents cleartext traffic. return false; } } return true; } /** * Returns true if the URI is a path to a local file or a reference to a local file. * * @param uri The uri to test. */ public static boolean isLocalFileUri(Uri uri) { String scheme = uri.getScheme(); return TextUtils.isEmpty(scheme) || "file".equals(scheme); } /** * Tests two objects for {@link Object#equals(Object)} equality, handling the case where one or * both may be null. * * @param o1 The first object. * @param o2 The second object. * @return {@code o1 == null ? o2 == null : o1.equals(o2)}. */ public static boolean areEqual(@Nullable Object o1, @Nullable Object o2) { return o1 == null ? o2 == null : o1.equals(o2); } /** * Tests whether an {@code items} array contains an object equal to {@code item}, according to * {@link Object#equals(Object)}. * * <p>If {@code item} is null then true is returned if and only if {@code items} contains null. * * @param items The array of items to search. * @param item The item to search for. * @return True if the array contains an object equal to the item being searched for. */ public static boolean contains(@NullableType Object[] items, @Nullable Object item) { for (Object arrayItem : items) { if (areEqual(arrayItem, item)) { return true; } } return false; } /** * Removes an indexed range from a List. * * <p>Does nothing if the provided range is valid and {@code fromIndex == toIndex}. * * @param list The List to remove the range from. * @param fromIndex The first index to be removed (inclusive). * @param toIndex The last index to be removed (exclusive). * @throws IllegalArgumentException If {@code fromIndex} < 0, {@code toIndex} > {@code * list.size()}, or {@code fromIndex} > {@code toIndex}. */ public static <T> void removeRange(List<T> list, int fromIndex, int toIndex) { if (fromIndex < 0 || toIndex > list.size() || fromIndex > toIndex) { throw new IllegalArgumentException(); } else if (fromIndex != toIndex) { // Checking index inequality prevents an unnecessary allocation. list.subList(fromIndex, toIndex).clear(); } } /** * Casts a nullable variable to a non-null variable without runtime null check. * * <p>Use {@link Assertions#checkNotNull(Object)} to throw if the value is null. */ @SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"}) @EnsuresNonNull("#1") public static <T> T castNonNull(@Nullable T value) { return value; } /** Casts a nullable type array to a non-null type array without runtime null check. */ @SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"}) @EnsuresNonNull("#1") public static <T> T[] castNonNullTypeArray(@NullableType T[] value) { return value; } /** * Copies and optionally truncates an array. Prevents null array elements created by {@link * Arrays#copyOf(Object[], int)} by ensuring the new length does not exceed the current length. * * @param input The input array. * @param length The output array length. Must be less or equal to the length of the input array. * @return The copied array. */ @SuppressWarnings({"nullness:argument.type.incompatible", "nullness:return.type.incompatible"}) public static <T> T[] nullSafeArrayCopy(T[] input, int length) { Assertions.checkArgument(length <= input.length); return Arrays.copyOf(input, length); } /** * Copies a subset of an array. * * @param input The input array. * @param from The start the range to be copied, inclusive * @param to The end of the range to be copied, exclusive. * @return The copied array. */ @SuppressWarnings({"nullness:argument.type.incompatible", "nullness:return.type.incompatible"}) public static <T> T[] nullSafeArrayCopyOfRange(T[] input, int from, int to) { Assertions.checkArgument(0 <= from); Assertions.checkArgument(to <= input.length); return Arrays.copyOfRange(input, from, to); } /** * Creates a new array containing {@code original} with {@code newElement} appended. * * @param original The input array. * @param newElement The element to append. * @return The new array. */ public static <T> T[] nullSafeArrayAppend(T[] original, T newElement) { @NullableType T[] result = Arrays.copyOf(original, original.length + 1); result[original.length] = newElement; return castNonNullTypeArray(result); } /** * Creates a new array containing the concatenation of two non-null type arrays. * * @param first The first array. * @param second The second array. * @return The concatenated result. */ @SuppressWarnings({"nullness:assignment.type.incompatible"}) public static <T> T[] nullSafeArrayConcatenation(T[] first, T[] second) { T[] concatenation = Arrays.copyOf(first, first.length + second.length); System.arraycopy( /* src= */ second, /* srcPos= */ 0, /* dest= */ concatenation, /* destPos= */ first.length, /* length= */ second.length); return concatenation; } /** * Creates a {@link Handler} with the specified {@link Handler.Callback} on the current {@link * Looper} thread. The method accepts partially initialized objects as callback under the * assumption that the Handler won't be used to send messages until the callback is fully * initialized. * * <p>If the current thread doesn't have a {@link Looper}, the application's main thread {@link * Looper} is used. * * @param callback A {@link Handler.Callback}. May be a partially initialized class. * @return A {@link Handler} with the specified callback on the current {@link Looper} thread. */ public static Handler createHandler([email protected] Callback callback) { return createHandler(getLooper(), callback); } /** * Creates a {@link Handler} with the specified {@link Handler.Callback} on the specified {@link * Looper} thread. The method accepts partially initialized objects as callback under the * assumption that the Handler won't be used to send messages until the callback is fully * initialized. * * @param looper A {@link Looper} to run the callback on. * @param callback A {@link Handler.Callback}. May be a partially initialized class. * @return A {@link Handler} with the specified callback on the current {@link Looper} thread. */ @SuppressWarnings({"nullness:argument.type.incompatible", "nullness:return.type.incompatible"}) public static Handler createHandler( Looper looper, [email protected] Callback callback) { return new Handler(looper, callback); } /** * Returns the {@link Looper} associated with the current thread, or the {@link Looper} of the * application's main thread if the current thread doesn't have a {@link Looper}. */ public static Looper getLooper() { Looper myLooper = Looper.myLooper(); return myLooper != null ? myLooper : Looper.getMainLooper(); } /** * Instantiates a new single threaded executor whose thread has the specified name. * * @param threadName The name of the thread. * @return The executor. */ public static ExecutorService newSingleThreadExecutor(final String threadName) { return Executors.newSingleThreadExecutor(runnable -> new Thread(runnable, threadName)); } /** * Closes a {@link DataSource}, suppressing any {@link IOException} that may occur. * * @param dataSource The {@link DataSource} to close. */ public static void closeQuietly(@Nullable DataSource dataSource) { try { if (dataSource != null) { dataSource.close(); } } catch (IOException e) { // Ignore. } } /** * Closes a {@link Closeable}, suppressing any {@link IOException} that may occur. Both {@link * java.io.OutputStream} and {@link InputStream} are {@code Closeable}. * * @param closeable The {@link Closeable} to close. */ public static void closeQuietly(@Nullable Closeable closeable) { try { if (closeable != null) { closeable.close(); } } catch (IOException e) { // Ignore. } } /** * Reads an integer from a {@link Parcel} and interprets it as a boolean, with 0 mapping to false * and all other values mapping to true. * * @param parcel The {@link Parcel} to read from. * @return The read value. */ public static boolean readBoolean(Parcel parcel) { return parcel.readInt() != 0; } /** * Writes a boolean to a {@link Parcel}. The boolean is written as an integer with value 1 (true) * or 0 (false). * * @param parcel The {@link Parcel} to write to. * @param value The value to write. */ public static void writeBoolean(Parcel parcel, boolean value) { parcel.writeInt(value ? 1 : 0); } /** * Returns the language tag for a {@link Locale}. * * <p>For API levels ≥ 21, this tag is IETF BCP 47 compliant. Use {@link * #normalizeLanguageCode(String)} to retrieve a normalized IETF BCP 47 language tag for all API * levels if needed. * * @param locale A {@link Locale}. * @return The language tag. */ public static String getLocaleLanguageTag(Locale locale) { return SDK_INT >= 21 ? getLocaleLanguageTagV21(locale) : locale.toString(); } /** * Returns a normalized IETF BCP 47 language tag for {@code language}. * * @param language A case-insensitive language code supported by {@link * Locale#forLanguageTag(String)}. * @return The all-lowercase normalized code, or null if the input was null, or {@code * language.toLowerCase()} if the language could not be normalized. */ public static @PolyNull String normalizeLanguageCode(@PolyNull String language) { if (language == null) { return null; } // Locale data (especially for API < 21) may produce tags with '_' instead of the // standard-conformant '-'. String normalizedTag = language.replace('_', '-'); if (Util.SDK_INT >= 21) { // Filters out ill-formed sub-tags, replaces deprecated tags and normalizes all valid tags. normalizedTag = normalizeLanguageCodeSyntaxV21(normalizedTag); } if (normalizedTag.isEmpty() || "und".equals(normalizedTag)) { // Tag isn't valid, keep using the original. normalizedTag = language; } normalizedTag = Util.toLowerInvariant(normalizedTag); String mainLanguage = Util.splitAtFirst(normalizedTag, "-")[0]; if (mainLanguage.length() == 3) { // 3-letter ISO 639-2/B or ISO 639-2/T language codes will not be converted to 2-letter ISO // 639-1 codes automatically. if (languageTagIso3ToIso2 == null) { languageTagIso3ToIso2 = createIso3ToIso2Map(); } String iso2Language = languageTagIso3ToIso2.get(mainLanguage); if (iso2Language != null) { normalizedTag = iso2Language + normalizedTag.substring(/* beginIndex= */ 3); } } return normalizedTag; } /** * Returns a new {@link String} constructed by decoding UTF-8 encoded bytes. * * @param bytes The UTF-8 encoded bytes to decode. * @return The string. */ public static String fromUtf8Bytes(byte[] bytes) { return new String(bytes, Charset.forName(C.UTF8_NAME)); } /** * Returns a new {@link String} constructed by decoding UTF-8 encoded bytes in a subarray. * * @param bytes The UTF-8 encoded bytes to decode. * @param offset The index of the first byte to decode. * @param length The number of bytes to decode. * @return The string. */ public static String fromUtf8Bytes(byte[] bytes, int offset, int length) { return new String(bytes, offset, length, Charset.forName(C.UTF8_NAME)); } /** * Returns a new byte array containing the code points of a {@link String} encoded using UTF-8. * * @param value The {@link String} whose bytes should be obtained. * @return The code points encoding using UTF-8. */ public static byte[] getUtf8Bytes(String value) { return value.getBytes(Charset.forName(C.UTF8_NAME)); } /** * Splits a string using {@code value.split(regex, -1}). Note: this is is similar to {@link * String#split(String)} but empty matches at the end of the string will not be omitted from the * returned array. * * @param value The string to split. * @param regex A delimiting regular expression. * @return The array of strings resulting from splitting the string. */ public static String[] split(String value, String regex) { return value.split(regex, /* limit= */ -1); } /** * Splits the string at the first occurrence of the delimiter {@code regex}. If the delimiter does * not match, returns an array with one element which is the input string. If the delimiter does * match, returns an array with the portion of the string before the delimiter and the rest of the * string. * * @param value The string. * @param regex A delimiting regular expression. * @return The string split by the first occurrence of the delimiter. */ public static String[] splitAtFirst(String value, String regex) { return value.split(regex, /* limit= */ 2); } /** * Returns whether the given character is a carriage return ('\r') or a line feed ('\n'). * * @param c The character. * @return Whether the given character is a linebreak. */ public static boolean isLinebreak(int c) { return c == '\n' || c == '\r'; } /** * Converts text to lower case using {@link Locale#US}. * * @param text The text to convert. * @return The lower case text, or null if {@code text} is null. */ public static @PolyNull String toLowerInvariant(@PolyNull String text) { return text == null ? text : text.toLowerCase(Locale.US); } /** * Converts text to upper case using {@link Locale#US}. * * @param text The text to convert. * @return The upper case text, or null if {@code text} is null. */ public static @PolyNull String toUpperInvariant(@PolyNull String text) { return text == null ? text : text.toUpperCase(Locale.US); } /** * Formats a string using {@link Locale#US}. * * @see String#format(String, Object...) */ public static String formatInvariant(String format, Object... args) { return String.format(Locale.US, format, args); } /** * Divides a {@code numerator} by a {@code denominator}, returning the ceiled result. * * @param numerator The numerator to divide. * @param denominator The denominator to divide by. * @return The ceiled result of the division. */ public static int ceilDivide(int numerator, int denominator) { return (numerator + denominator - 1) / denominator; } /** * Divides a {@code numerator} by a {@code denominator}, returning the ceiled result. * * @param numerator The numerator to divide. * @param denominator The denominator to divide by. * @return The ceiled result of the division. */ public static long ceilDivide(long numerator, long denominator) { return (numerator + denominator - 1) / denominator; } /** * Constrains a value to the specified bounds. * * @param value The value to constrain. * @param min The lower bound. * @param max The upper bound. * @return The constrained value {@code Math.max(min, Math.min(value, max))}. */ public static int constrainValue(int value, int min, int max) { return Math.max(min, Math.min(value, max)); } /** * Constrains a value to the specified bounds. * * @param value The value to constrain. * @param min The lower bound. * @param max The upper bound. * @return The constrained value {@code Math.max(min, Math.min(value, max))}. */ public static long constrainValue(long value, long min, long max) { return Math.max(min, Math.min(value, max)); } /** * Constrains a value to the specified bounds. * * @param value The value to constrain. * @param min The lower bound. * @param max The upper bound. * @return The constrained value {@code Math.max(min, Math.min(value, max))}. */ public static float constrainValue(float value, float min, float max) { return Math.max(min, Math.min(value, max)); } /** * Returns the sum of two arguments, or a third argument if the result overflows. * * @param x The first value. * @param y The second value. * @param overflowResult The return value if {@code x + y} overflows. * @return {@code x + y}, or {@code overflowResult} if the result overflows. */ public static long addWithOverflowDefault(long x, long y, long overflowResult) { long result = x + y; // See Hacker's Delight 2-13 (H. Warren Jr). if (((x ^ result) & (y ^ result)) < 0) { return overflowResult; } return result; } /** * Returns the difference between two arguments, or a third argument if the result overflows. * * @param x The first value. * @param y The second value. * @param overflowResult The return value if {@code x - y} overflows. * @return {@code x - y}, or {@code overflowResult} if the result overflows. */ public static long subtractWithOverflowDefault(long x, long y, long overflowResult) { long result = x - y; // See Hacker's Delight 2-13 (H. Warren Jr). if (((x ^ y) & (x ^ result)) < 0) { return overflowResult; } return result; } /** * Returns the index of the first occurrence of {@code value} in {@code array}, or {@link * C#INDEX_UNSET} if {@code value} is not contained in {@code array}. * * @param array The array to search. * @param value The value to search for. * @return The index of the first occurrence of value in {@code array}, or {@link C#INDEX_UNSET} * if {@code value} is not contained in {@code array}. */ public static int linearSearch(int[] array, int value) { for (int i = 0; i < array.length; i++) { if (array[i] == value) { return i; } } return C.INDEX_UNSET; } /** * Returns the index of the largest element in {@code array} that is less than (or optionally * equal to) a specified {@code value}. * * <p>The search is performed using a binary search algorithm, so the array must be sorted. If the * array contains multiple elements equal to {@code value} and {@code inclusive} is true, the * index of the first one will be returned. * * @param array The array to search. * @param value The value being searched for. * @param inclusive If the value is present in the array, whether to return the corresponding * index. If false then the returned index corresponds to the largest element strictly less * than the value. * @param stayInBounds If true, then 0 will be returned in the case that the value is smaller than * the smallest element in the array. If false then -1 will be returned. * @return The index of the largest element in {@code array} that is less than (or optionally * equal to) {@code value}. */ public static int binarySearchFloor( int[] array, int value, boolean inclusive, boolean stayInBounds) { int index = Arrays.binarySearch(array, value); if (index < 0) { index = -(index + 2); } else { while (--index >= 0 && array[index] == value) {} if (inclusive) { index++; } } return stayInBounds ? Math.max(0, index) : index; } /** * Returns the index of the largest element in {@code array} that is less than (or optionally * equal to) a specified {@code value}. * <p> * The search is performed using a binary search algorithm, so the array must be sorted. If the * array contains multiple elements equal to {@code value} and {@code inclusive} is true, the * index of the first one will be returned. * * @param array The array to search. * @param value The value being searched for. * @param inclusive If the value is present in the array, whether to return the corresponding * index. If false then the returned index corresponds to the largest element strictly less * than the value. * @param stayInBounds If true, then 0 will be returned in the case that the value is smaller than * the smallest element in the array. If false then -1 will be returned. * @return The index of the largest element in {@code array} that is less than (or optionally * equal to) {@code value}. */ public static int binarySearchFloor(long[] array, long value, boolean inclusive, boolean stayInBounds) { int index = Arrays.binarySearch(array, value); if (index < 0) { index = -(index + 2); } else { while (--index >= 0 && array[index] == value) {} if (inclusive) { index++; } } return stayInBounds ? Math.max(0, index) : index; } /** * Returns the index of the largest element in {@code list} that is less than (or optionally equal * to) a specified {@code value}. * * <p>The search is performed using a binary search algorithm, so the list must be sorted. If the * list contains multiple elements equal to {@code value} and {@code inclusive} is true, the index * of the first one will be returned. * * @param <T> The type of values being searched. * @param list The list to search. * @param value The value being searched for. * @param inclusive If the value is present in the list, whether to return the corresponding * index. If false then the returned index corresponds to the largest element strictly less * than the value. * @param stayInBounds If true, then 0 will be returned in the case that the value is smaller than * the smallest element in the list. If false then -1 will be returned. * @return The index of the largest element in {@code list} that is less than (or optionally equal * to) {@code value}. */ public static <T extends Comparable<? super T>> int binarySearchFloor( List<? extends Comparable<? super T>> list, T value, boolean inclusive, boolean stayInBounds) { int index = Collections.binarySearch(list, value); if (index < 0) { index = -(index + 2); } else { while (--index >= 0 && list.get(index).compareTo(value) == 0) {} if (inclusive) { index++; } } return stayInBounds ? Math.max(0, index) : index; } /** * Returns the index of the smallest element in {@code array} that is greater than (or optionally * equal to) a specified {@code value}. * * <p>The search is performed using a binary search algorithm, so the array must be sorted. If the * array contains multiple elements equal to {@code value} and {@code inclusive} is true, the * index of the last one will be returned. * * @param array The array to search. * @param value The value being searched for. * @param inclusive If the value is present in the array, whether to return the corresponding * index. If false then the returned index corresponds to the smallest element strictly * greater than the value. * @param stayInBounds If true, then {@code (a.length - 1)} will be returned in the case that the * value is greater than the largest element in the array. If false then {@code a.length} will * be returned. * @return The index of the smallest element in {@code array} that is greater than (or optionally * equal to) {@code value}. */ public static int binarySearchCeil( int[] array, int value, boolean inclusive, boolean stayInBounds) { int index = Arrays.binarySearch(array, value); if (index < 0) { index = ~index; } else { while (++index < array.length && array[index] == value) {} if (inclusive) { index--; } } return stayInBounds ? Math.min(array.length - 1, index) : index; } /** * Returns the index of the smallest element in {@code array} that is greater than (or optionally * equal to) a specified {@code value}. * * <p>The search is performed using a binary search algorithm, so the array must be sorted. If the * array contains multiple elements equal to {@code value} and {@code inclusive} is true, the * index of the last one will be returned. * * @param array The array to search. * @param value The value being searched for. * @param inclusive If the value is present in the array, whether to return the corresponding * index. If false then the returned index corresponds to the smallest element strictly * greater than the value. * @param stayInBounds If true, then {@code (a.length - 1)} will be returned in the case that the * value is greater than the largest element in the array. If false then {@code a.length} will * be returned. * @return The index of the smallest element in {@code array} that is greater than (or optionally * equal to) {@code value}. */ public static int binarySearchCeil( long[] array, long value, boolean inclusive, boolean stayInBounds) { int index = Arrays.binarySearch(array, value); if (index < 0) { index = ~index; } else { while (++index < array.length && array[index] == value) {} if (inclusive) { index--; } } return stayInBounds ? Math.min(array.length - 1, index) : index; } /** * Returns the index of the smallest element in {@code list} that is greater than (or optionally * equal to) a specified value. * * <p>The search is performed using a binary search algorithm, so the list must be sorted. If the * list contains multiple elements equal to {@code value} and {@code inclusive} is true, the index * of the last one will be returned. * * @param <T> The type of values being searched. * @param list The list to search. * @param value The value being searched for. * @param inclusive If the value is present in the list, whether to return the corresponding * index. If false then the returned index corresponds to the smallest element strictly * greater than the value. * @param stayInBounds If true, then {@code (list.size() - 1)} will be returned in the case that * the value is greater than the largest element in the list. If false then {@code * list.size()} will be returned. * @return The index of the smallest element in {@code list} that is greater than (or optionally * equal to) {@code value}. */ public static <T extends Comparable<? super T>> int binarySearchCeil( List<? extends Comparable<? super T>> list, T value, boolean inclusive, boolean stayInBounds) { int index = Collections.binarySearch(list, value); if (index < 0) { index = ~index; } else { int listSize = list.size(); while (++index < listSize && list.get(index).compareTo(value) == 0) {} if (inclusive) { index--; } } return stayInBounds ? Math.min(list.size() - 1, index) : index; } /** * Compares two long values and returns the same value as {@code Long.compare(long, long)}. * * @param left The left operand. * @param right The right operand. * @return 0, if left == right, a negative value if left < right, or a positive value if left * > right. */ public static int compareLong(long left, long right) { return left < right ? -1 : left == right ? 0 : 1; } /** * Parses an xs:duration attribute value, returning the parsed duration in milliseconds. * * @param value The attribute value to decode. * @return The parsed duration in milliseconds. */ public static long parseXsDuration(String value) { Matcher matcher = XS_DURATION_PATTERN.matcher(value); if (matcher.matches()) { boolean negated = !TextUtils.isEmpty(matcher.group(1)); // Durations containing years and months aren't completely defined. We assume there are // 30.4368 days in a month, and 365.242 days in a year. String years = matcher.group(3); double durationSeconds = (years != null) ? Double.parseDouble(years) * 31556908 : 0; String months = matcher.group(5); durationSeconds += (months != null) ? Double.parseDouble(months) * 2629739 : 0; String days = matcher.group(7); durationSeconds += (days != null) ? Double.parseDouble(days) * 86400 : 0; String hours = matcher.group(10); durationSeconds += (hours != null) ? Double.parseDouble(hours) * 3600 : 0; String minutes = matcher.group(12); durationSeconds += (minutes != null) ? Double.parseDouble(minutes) * 60 : 0; String seconds = matcher.group(14); durationSeconds += (seconds != null) ? Double.parseDouble(seconds) : 0; long durationMillis = (long) (durationSeconds * 1000); return negated ? -durationMillis : durationMillis; } else { return (long) (Double.parseDouble(value) * 3600 * 1000); } } /** * Parses an xs:dateTime attribute value, returning the parsed timestamp in milliseconds since * the epoch. * * @param value The attribute value to decode. * @return The parsed timestamp in milliseconds since the epoch. * @throws ParserException if an error occurs parsing the dateTime attribute value. */ public static long parseXsDateTime(String value) throws ParserException { Matcher matcher = XS_DATE_TIME_PATTERN.matcher(value); if (!matcher.matches()) { throw new ParserException("Invalid date/time format: " + value); } int timezoneShift; if (matcher.group(9) == null) { // No time zone specified. timezoneShift = 0; } else if (matcher.group(9).equalsIgnoreCase("Z")) { timezoneShift = 0; } else { timezoneShift = ((Integer.parseInt(matcher.group(12)) * 60 + Integer.parseInt(matcher.group(13)))); if ("-".equals(matcher.group(11))) { timezoneShift *= -1; } } Calendar dateTime = new GregorianCalendar(TimeZone.getTimeZone("GMT")); dateTime.clear(); // Note: The month value is 0-based, hence the -1 on group(2) dateTime.set(Integer.parseInt(matcher.group(1)), Integer.parseInt(matcher.group(2)) - 1, Integer.parseInt(matcher.group(3)), Integer.parseInt(matcher.group(4)), Integer.parseInt(matcher.group(5)), Integer.parseInt(matcher.group(6))); if (!TextUtils.isEmpty(matcher.group(8))) { final BigDecimal bd = new BigDecimal("0." + matcher.group(8)); // we care only for milliseconds, so movePointRight(3) dateTime.set(Calendar.MILLISECOND, bd.movePointRight(3).intValue()); } long time = dateTime.getTimeInMillis(); if (timezoneShift != 0) { time -= timezoneShift * 60000; } return time; } /** * Scales a large timestamp. * <p> * Logically, scaling consists of a multiplication followed by a division. The actual operations * performed are designed to minimize the probability of overflow. * * @param timestamp The timestamp to scale. * @param multiplier The multiplier. * @param divisor The divisor. * @return The scaled timestamp. */ public static long scaleLargeTimestamp(long timestamp, long multiplier, long divisor) { if (divisor >= multiplier && (divisor % multiplier) == 0) { long divisionFactor = divisor / multiplier; return timestamp / divisionFactor; } else if (divisor < multiplier && (multiplier % divisor) == 0) { long multiplicationFactor = multiplier / divisor; return timestamp * multiplicationFactor; } else { double multiplicationFactor = (double) multiplier / divisor; return (long) (timestamp * multiplicationFactor); } } /** * Applies {@link #scaleLargeTimestamp(long, long, long)} to a list of unscaled timestamps. * * @param timestamps The timestamps to scale. * @param multiplier The multiplier. * @param divisor The divisor. * @return The scaled timestamps. */ public static long[] scaleLargeTimestamps(List<Long> timestamps, long multiplier, long divisor) { long[] scaledTimestamps = new long[timestamps.size()]; if (divisor >= multiplier && (divisor % multiplier) == 0) { long divisionFactor = divisor / multiplier; for (int i = 0; i < scaledTimestamps.length; i++) { scaledTimestamps[i] = timestamps.get(i) / divisionFactor; } } else if (divisor < multiplier && (multiplier % divisor) == 0) { long multiplicationFactor = multiplier / divisor; for (int i = 0; i < scaledTimestamps.length; i++) { scaledTimestamps[i] = timestamps.get(i) * multiplicationFactor; } } else { double multiplicationFactor = (double) multiplier / divisor; for (int i = 0; i < scaledTimestamps.length; i++) { scaledTimestamps[i] = (long) (timestamps.get(i) * multiplicationFactor); } } return scaledTimestamps; } /** * Applies {@link #scaleLargeTimestamp(long, long, long)} to an array of unscaled timestamps. * * @param timestamps The timestamps to scale. * @param multiplier The multiplier. * @param divisor The divisor. */ public static void scaleLargeTimestampsInPlace(long[] timestamps, long multiplier, long divisor) { if (divisor >= multiplier && (divisor % multiplier) == 0) { long divisionFactor = divisor / multiplier; for (int i = 0; i < timestamps.length; i++) { timestamps[i] /= divisionFactor; } } else if (divisor < multiplier && (multiplier % divisor) == 0) { long multiplicationFactor = multiplier / divisor; for (int i = 0; i < timestamps.length; i++) { timestamps[i] *= multiplicationFactor; } } else { double multiplicationFactor = (double) multiplier / divisor; for (int i = 0; i < timestamps.length; i++) { timestamps[i] = (long) (timestamps[i] * multiplicationFactor); } } } /** * Returns the duration of media that will elapse in {@code playoutDuration}. * * @param playoutDuration The duration to scale. * @param speed The playback speed. * @return The scaled duration, in the same units as {@code playoutDuration}. */ public static long getMediaDurationForPlayoutDuration(long playoutDuration, float speed) { if (speed == 1f) { return playoutDuration; } return Math.round((double) playoutDuration * speed); } /** * Returns the playout duration of {@code mediaDuration} of media. * * @param mediaDuration The duration to scale. * @return The scaled duration, in the same units as {@code mediaDuration}. */ public static long getPlayoutDurationForMediaDuration(long mediaDuration, float speed) { if (speed == 1f) { return mediaDuration; } return Math.round((double) mediaDuration / speed); } /** * Resolves a seek given the requested seek position, a {@link SeekParameters} and two candidate * sync points. * * @param positionUs The requested seek position, in microseocnds. * @param seekParameters The {@link SeekParameters}. * @param firstSyncUs The first candidate seek point, in micrseconds. * @param secondSyncUs The second candidate seek point, in microseconds. May equal {@code * firstSyncUs} if there's only one candidate. * @return The resolved seek position, in microseconds. */ public static long resolveSeekPositionUs( long positionUs, SeekParameters seekParameters, long firstSyncUs, long secondSyncUs) { if (SeekParameters.EXACT.equals(seekParameters)) { return positionUs; } long minPositionUs = subtractWithOverflowDefault(positionUs, seekParameters.toleranceBeforeUs, Long.MIN_VALUE); long maxPositionUs = addWithOverflowDefault(positionUs, seekParameters.toleranceAfterUs, Long.MAX_VALUE); boolean firstSyncPositionValid = minPositionUs <= firstSyncUs && firstSyncUs <= maxPositionUs; boolean secondSyncPositionValid = minPositionUs <= secondSyncUs && secondSyncUs <= maxPositionUs; if (firstSyncPositionValid && secondSyncPositionValid) { if (Math.abs(firstSyncUs - positionUs) <= Math.abs(secondSyncUs - positionUs)) { return firstSyncUs; } else { return secondSyncUs; } } else if (firstSyncPositionValid) { return firstSyncUs; } else if (secondSyncPositionValid) { return secondSyncUs; } else { return minPositionUs; } } /** * Converts a list of integers to a primitive array. * * @param list A list of integers. * @return The list in array form, or null if the input list was null. */ public static int @PolyNull [] toArray(@PolyNull List<Integer> list) { if (list == null) { return null; } int length = list.size(); int[] intArray = new int[length]; for (int i = 0; i < length; i++) { intArray[i] = list.get(i); } return intArray; } /** * Returns the integer equal to the big-endian concatenation of the characters in {@code string} * as bytes. The string must be no more than four characters long. * * @param string A string no more than four characters long. */ public static int getIntegerCodeForString(String string) { int length = string.length(); Assertions.checkArgument(length <= 4); int result = 0; for (int i = 0; i < length; i++) { result <<= 8; result |= string.charAt(i); } return result; } /** * Converts an integer to a long by unsigned conversion. * * <p>This method is equivalent to {@link Integer#toUnsignedLong(int)} for API 26+. */ public static long toUnsignedLong(int x) { // x is implicitly casted to a long before the bit operation is executed but this does not // impact the method correctness. return x & 0xFFFFFFFFL; } /** * Returns a byte array containing values parsed from the hex string provided. * * @param hexString The hex string to convert to bytes. * @return A byte array containing values parsed from the hex string provided. */ public static byte[] getBytesFromHexString(String hexString) { byte[] data = new byte[hexString.length() / 2]; for (int i = 0; i < data.length; i++) { int stringOffset = i * 2; data[i] = (byte) ((Character.digit(hexString.charAt(stringOffset), 16) << 4) + Character.digit(hexString.charAt(stringOffset + 1), 16)); } return data; } /** * Returns a string with comma delimited simple names of each object's class. * * @param objects The objects whose simple class names should be comma delimited and returned. * @return A string with comma delimited simple names of each object's class. */ public static String getCommaDelimitedSimpleClassNames(Object[] objects) { StringBuilder stringBuilder = new StringBuilder(); for (int i = 0; i < objects.length; i++) { stringBuilder.append(objects[i].getClass().getSimpleName()); if (i < objects.length - 1) { stringBuilder.append(", "); } } return stringBuilder.toString(); } /** * Returns a user agent string based on the given application name and the library version. * * @param context A valid context of the calling application. * @param applicationName String that will be prefix'ed to the generated user agent. * @return A user agent string generated using the applicationName and the library version. */ public static String getUserAgent(Context context, String applicationName) { String versionName; try { String packageName = context.getPackageName(); PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0); versionName = info.versionName; } catch (NameNotFoundException e) { versionName = "?"; } return applicationName + "/" + versionName + " (Linux;Android " + Build.VERSION.RELEASE + ") " + ExoPlayerLibraryInfo.VERSION_SLASHY; } /** * Returns a copy of {@code codecs} without the codecs whose track type doesn't match {@code * trackType}. * * @param codecs A codec sequence string, as defined in RFC 6381. * @param trackType One of {@link C}{@code .TRACK_TYPE_*}. * @return A copy of {@code codecs} without the codecs whose track type doesn't match {@code * trackType}. If this ends up empty, or {@code codecs} is null, return null. */ public static @Nullable String getCodecsOfType(@Nullable String codecs, int trackType) { String[] codecArray = splitCodecs(codecs); if (codecArray.length == 0) { return null; } StringBuilder builder = new StringBuilder(); for (String codec : codecArray) { if (trackType == MimeTypes.getTrackTypeOfCodec(codec)) { if (builder.length() > 0) { builder.append(","); } builder.append(codec); } } return builder.length() > 0 ? builder.toString() : null; } /** * Splits a codecs sequence string, as defined in RFC 6381, into individual codec strings. * * @param codecs A codec sequence string, as defined in RFC 6381. * @return The split codecs, or an array of length zero if the input was empty or null. */ public static String[] splitCodecs(@Nullable String codecs) { if (TextUtils.isEmpty(codecs)) { return new String[0]; } return split(codecs.trim(), "(\\s*,\\s*)"); } /** * Converts a sample bit depth to a corresponding PCM encoding constant. * * @param bitDepth The bit depth. Supported values are 8, 16, 24 and 32. * @return The corresponding encoding. One of {@link C#ENCODING_PCM_8BIT}, * {@link C#ENCODING_PCM_16BIT}, {@link C#ENCODING_PCM_24BIT} and * {@link C#ENCODING_PCM_32BIT}. If the bit depth is unsupported then * {@link C#ENCODING_INVALID} is returned. */ @C.PcmEncoding public static int getPcmEncoding(int bitDepth) { switch (bitDepth) { case 8: return C.ENCODING_PCM_8BIT; case 16: return C.ENCODING_PCM_16BIT; case 24: return C.ENCODING_PCM_24BIT; case 32: return C.ENCODING_PCM_32BIT; default: return C.ENCODING_INVALID; } } /** * Returns whether {@code encoding} is one of the linear PCM encodings. * * @param encoding The encoding of the audio data. * @return Whether the encoding is one of the PCM encodings. */ public static boolean isEncodingLinearPcm(@C.Encoding int encoding) { return encoding == C.ENCODING_PCM_8BIT || encoding == C.ENCODING_PCM_16BIT || encoding == C.ENCODING_PCM_24BIT || encoding == C.ENCODING_PCM_32BIT || encoding == C.ENCODING_PCM_FLOAT; } /** * Returns whether {@code encoding} is high resolution (> 16-bit) integer PCM. * * @param encoding The encoding of the audio data. * @return Whether the encoding is high resolution integer PCM. */ public static boolean isEncodingHighResolutionIntegerPcm(@C.PcmEncoding int encoding) { return encoding == C.ENCODING_PCM_24BIT || encoding == C.ENCODING_PCM_32BIT; } /** * Returns the audio track channel configuration for the given channel count, or {@link * AudioFormat#CHANNEL_INVALID} if output is not poossible. * * @param channelCount The number of channels in the input audio. * @return The channel configuration or {@link AudioFormat#CHANNEL_INVALID} if output is not * possible. */ public static int getAudioTrackChannelConfig(int channelCount) { switch (channelCount) { case 1: return AudioFormat.CHANNEL_OUT_MONO; case 2: return AudioFormat.CHANNEL_OUT_STEREO; case 3: return AudioFormat.CHANNEL_OUT_STEREO | AudioFormat.CHANNEL_OUT_FRONT_CENTER; case 4: return AudioFormat.CHANNEL_OUT_QUAD; case 5: return AudioFormat.CHANNEL_OUT_QUAD | AudioFormat.CHANNEL_OUT_FRONT_CENTER; case 6: return AudioFormat.CHANNEL_OUT_5POINT1; case 7: return AudioFormat.CHANNEL_OUT_5POINT1 | AudioFormat.CHANNEL_OUT_BACK_CENTER; case 8: if (Util.SDK_INT >= 23) { return AudioFormat.CHANNEL_OUT_7POINT1_SURROUND; } else if (Util.SDK_INT >= 21) { // Equal to AudioFormat.CHANNEL_OUT_7POINT1_SURROUND, which is hidden before Android M. return AudioFormat.CHANNEL_OUT_5POINT1 | AudioFormat.CHANNEL_OUT_SIDE_LEFT | AudioFormat.CHANNEL_OUT_SIDE_RIGHT; } else { // 8 ch output is not supported before Android L. return AudioFormat.CHANNEL_INVALID; } default: return AudioFormat.CHANNEL_INVALID; } } /** * Returns the frame size for audio with {@code channelCount} channels in the specified encoding. * * @param pcmEncoding The encoding of the audio data. * @param channelCount The channel count. * @return The size of one audio frame in bytes. */ public static int getPcmFrameSize(@C.PcmEncoding int pcmEncoding, int channelCount) { switch (pcmEncoding) { case C.ENCODING_PCM_8BIT: return channelCount; case C.ENCODING_PCM_16BIT: return channelCount * 2; case C.ENCODING_PCM_24BIT: return channelCount * 3; case C.ENCODING_PCM_32BIT: case C.ENCODING_PCM_FLOAT: return channelCount * 4; case C.ENCODING_PCM_A_LAW: case C.ENCODING_PCM_MU_LAW: case C.ENCODING_INVALID: case Format.NO_VALUE: default: throw new IllegalArgumentException(); } } /** * Returns the {@link C.AudioUsage} corresponding to the specified {@link C.StreamType}. */ @C.AudioUsage public static int getAudioUsageForStreamType(@C.StreamType int streamType) { switch (streamType) { case C.STREAM_TYPE_ALARM: return C.USAGE_ALARM; case C.STREAM_TYPE_DTMF: return C.USAGE_VOICE_COMMUNICATION_SIGNALLING; case C.STREAM_TYPE_NOTIFICATION: return C.USAGE_NOTIFICATION; case C.STREAM_TYPE_RING: return C.USAGE_NOTIFICATION_RINGTONE; case C.STREAM_TYPE_SYSTEM: return C.USAGE_ASSISTANCE_SONIFICATION; case C.STREAM_TYPE_VOICE_CALL: return C.USAGE_VOICE_COMMUNICATION; case C.STREAM_TYPE_USE_DEFAULT: case C.STREAM_TYPE_MUSIC: default: return C.USAGE_MEDIA; } } /** * Returns the {@link C.AudioContentType} corresponding to the specified {@link C.StreamType}. */ @C.AudioContentType public static int getAudioContentTypeForStreamType(@C.StreamType int streamType) { switch (streamType) { case C.STREAM_TYPE_ALARM: case C.STREAM_TYPE_DTMF: case C.STREAM_TYPE_NOTIFICATION: case C.STREAM_TYPE_RING: case C.STREAM_TYPE_SYSTEM: return C.CONTENT_TYPE_SONIFICATION; case C.STREAM_TYPE_VOICE_CALL: return C.CONTENT_TYPE_SPEECH; case C.STREAM_TYPE_USE_DEFAULT: case C.STREAM_TYPE_MUSIC: default: return C.CONTENT_TYPE_MUSIC; } } /** * Returns the {@link C.StreamType} corresponding to the specified {@link C.AudioUsage}. */ @C.StreamType public static int getStreamTypeForAudioUsage(@C.AudioUsage int usage) { switch (usage) { case C.USAGE_MEDIA: case C.USAGE_GAME: case C.USAGE_ASSISTANCE_NAVIGATION_GUIDANCE: return C.STREAM_TYPE_MUSIC; case C.USAGE_ASSISTANCE_SONIFICATION: return C.STREAM_TYPE_SYSTEM; case C.USAGE_VOICE_COMMUNICATION: return C.STREAM_TYPE_VOICE_CALL; case C.USAGE_VOICE_COMMUNICATION_SIGNALLING: return C.STREAM_TYPE_DTMF; case C.USAGE_ALARM: return C.STREAM_TYPE_ALARM; case C.USAGE_NOTIFICATION_RINGTONE: return C.STREAM_TYPE_RING; case C.USAGE_NOTIFICATION: case C.USAGE_NOTIFICATION_COMMUNICATION_REQUEST: case C.USAGE_NOTIFICATION_COMMUNICATION_INSTANT: case C.USAGE_NOTIFICATION_COMMUNICATION_DELAYED: case C.USAGE_NOTIFICATION_EVENT: return C.STREAM_TYPE_NOTIFICATION; case C.USAGE_ASSISTANCE_ACCESSIBILITY: case C.USAGE_ASSISTANT: case C.USAGE_UNKNOWN: default: return C.STREAM_TYPE_DEFAULT; } } /** * Derives a DRM {@link UUID} from {@code drmScheme}. * * @param drmScheme A UUID string, or {@code "widevine"}, {@code "playready"} or {@code * "clearkey"}. * @return The derived {@link UUID}, or {@code null} if one could not be derived. */ public static @Nullable UUID getDrmUuid(String drmScheme) { switch (toLowerInvariant(drmScheme)) { case "widevine": return C.WIDEVINE_UUID; case "playready": return C.PLAYREADY_UUID; case "clearkey": return C.CLEARKEY_UUID; default: try { return UUID.fromString(drmScheme); } catch (RuntimeException e) { return null; } } } /** * Makes a best guess to infer the type from a {@link Uri}. * * @param uri The {@link Uri}. * @param overrideExtension If not null, used to infer the type. * @return The content type. */ @C.ContentType public static int inferContentType(Uri uri, @Nullable String overrideExtension) { return TextUtils.isEmpty(overrideExtension) ? inferContentType(uri) : inferContentType("." + overrideExtension); } /** * Makes a best guess to infer the type from a {@link Uri}. * * @param uri The {@link Uri}. * @return The content type. */ @C.ContentType public static int inferContentType(Uri uri) { String path = uri.getPath(); return path == null ? C.TYPE_OTHER : inferContentType(path); } /** * Makes a best guess to infer the type from a file name. * * @param fileName Name of the file. It can include the path of the file. * @return The content type. */ @C.ContentType public static int inferContentType(String fileName) { fileName = toLowerInvariant(fileName); if (fileName.endsWith(".mpd")) { return C.TYPE_DASH; } else if (fileName.endsWith(".m3u8")) { return C.TYPE_HLS; } else if (fileName.matches(".*\\.ism(l)?(/manifest(\\(.+\\))?)?")) { return C.TYPE_SS; } else { return C.TYPE_OTHER; } } /** * Returns the specified millisecond time formatted as a string. * * @param builder The builder that {@code formatter} will write to. * @param formatter The formatter. * @param timeMs The time to format as a string, in milliseconds. * @return The time formatted as a string. */ public static String getStringForTime(StringBuilder builder, Formatter formatter, long timeMs) { if (timeMs == C.TIME_UNSET) { timeMs = 0; } long totalSeconds = (timeMs + 500) / 1000; long seconds = totalSeconds % 60; long minutes = (totalSeconds / 60) % 60; long hours = totalSeconds / 3600; builder.setLength(0); return hours > 0 ? formatter.format("%d:%02d:%02d", hours, minutes, seconds).toString() : formatter.format("%02d:%02d", minutes, seconds).toString(); } /** * Escapes a string so that it's safe for use as a file or directory name on at least FAT32 * filesystems. FAT32 is the most restrictive of all filesystems still commonly used today. * * <p>For simplicity, this only handles common characters known to be illegal on FAT32: * <, >, :, ", /, \, |, ?, and *. % is also escaped since it is used as the escape * character. Escaping is performed in a consistent way so that no collisions occur and * {@link #unescapeFileName(String)} can be used to retrieve the original file name. * * @param fileName File name to be escaped. * @return An escaped file name which will be safe for use on at least FAT32 filesystems. */ public static String escapeFileName(String fileName) { int length = fileName.length(); int charactersToEscapeCount = 0; for (int i = 0; i < length; i++) { if (shouldEscapeCharacter(fileName.charAt(i))) { charactersToEscapeCount++; } } if (charactersToEscapeCount == 0) { return fileName; } int i = 0; StringBuilder builder = new StringBuilder(length + charactersToEscapeCount * 2); while (charactersToEscapeCount > 0) { char c = fileName.charAt(i++); if (shouldEscapeCharacter(c)) { builder.append('%').append(Integer.toHexString(c)); charactersToEscapeCount--; } else { builder.append(c); } } if (i < length) { builder.append(fileName, i, length); } return builder.toString(); } private static boolean shouldEscapeCharacter(char c) { switch (c) { case '<': case '>': case ':': case '"': case '/': case '\\': case '|': case '?': case '*': case '%': return true; default: return false; } } /** * Unescapes an escaped file or directory name back to its original value. * * <p>See {@link #escapeFileName(String)} for more information. * * @param fileName File name to be unescaped. * @return The original value of the file name before it was escaped, or null if the escaped * fileName seems invalid. */ public static @Nullable String unescapeFileName(String fileName) { int length = fileName.length(); int percentCharacterCount = 0; for (int i = 0; i < length; i++) { if (fileName.charAt(i) == '%') { percentCharacterCount++; } } if (percentCharacterCount == 0) { return fileName; } int expectedLength = length - percentCharacterCount * 2; StringBuilder builder = new StringBuilder(expectedLength); Matcher matcher = ESCAPED_CHARACTER_PATTERN.matcher(fileName); int startOfNotEscaped = 0; while (percentCharacterCount > 0 && matcher.find()) { char unescapedCharacter = (char) Integer.parseInt(matcher.group(1), 16); builder.append(fileName, startOfNotEscaped, matcher.start()).append(unescapedCharacter); startOfNotEscaped = matcher.end(); percentCharacterCount--; } if (startOfNotEscaped < length) { builder.append(fileName, startOfNotEscaped, length); } if (builder.length() != expectedLength) { return null; } return builder.toString(); } /** * A hacky method that always throws {@code t} even if {@code t} is a checked exception, * and is not declared to be thrown. */ public static void sneakyThrow(Throwable t) { sneakyThrowInternal(t); } @SuppressWarnings("unchecked") private static <T extends Throwable> void sneakyThrowInternal(Throwable t) throws T { throw (T) t; } /** Recursively deletes a directory and its content. */ public static void recursiveDelete(File fileOrDirectory) { File[] directoryFiles = fileOrDirectory.listFiles(); if (directoryFiles != null) { for (File child : directoryFiles) { recursiveDelete(child); } } fileOrDirectory.delete(); } /** Creates an empty directory in the directory returned by {@link Context#getCacheDir()}. */ public static File createTempDirectory(Context context, String prefix) throws IOException { File tempFile = createTempFile(context, prefix); tempFile.delete(); // Delete the temp file. tempFile.mkdir(); // Create a directory with the same name. return tempFile; } /** Creates a new empty file in the directory returned by {@link Context#getCacheDir()}. */ public static File createTempFile(Context context, String prefix) throws IOException { return File.createTempFile(prefix, null, context.getCacheDir()); } /** * Returns the result of updating a CRC-32 with the specified bytes in a "most significant bit * first" order. * * @param bytes Array containing the bytes to update the crc value with. * @param start The index to the first byte in the byte range to update the crc with. * @param end The index after the last byte in the byte range to update the crc with. * @param initialValue The initial value for the crc calculation. * @return The result of updating the initial value with the specified bytes. */ public static int crc32(byte[] bytes, int start, int end, int initialValue) { for (int i = start; i < end; i++) { initialValue = (initialValue << 8) ^ CRC32_BYTES_MSBF[((initialValue >>> 24) ^ (bytes[i] & 0xFF)) & 0xFF]; } return initialValue; } /** * Returns the result of updating a CRC-8 with the specified bytes in a "most significant bit * first" order. * * @param bytes Array containing the bytes to update the crc value with. * @param start The index to the first byte in the byte range to update the crc with. * @param end The index after the last byte in the byte range to update the crc with. * @param initialValue The initial value for the crc calculation. * @return The result of updating the initial value with the specified bytes. */ public static int crc8(byte[] bytes, int start, int end, int initialValue) { for (int i = start; i < end; i++) { initialValue = CRC8_BYTES_MSBF[initialValue ^ (bytes[i] & 0xFF)]; } return initialValue; } /** * Returns the {@link C.NetworkType} of the current network connection. * * @param context A context to access the connectivity manager. * @return The {@link C.NetworkType} of the current network connection. */ @C.NetworkType public static int getNetworkType(Context context) { if (context == null) { // Note: This is for backward compatibility only (context used to be @Nullable). return C.NETWORK_TYPE_UNKNOWN; } NetworkInfo networkInfo; ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivityManager == null) { return C.NETWORK_TYPE_UNKNOWN; } try { networkInfo = connectivityManager.getActiveNetworkInfo(); } catch (SecurityException e) { // Expected if permission was revoked. return C.NETWORK_TYPE_UNKNOWN; } if (networkInfo == null || !networkInfo.isConnected()) { return C.NETWORK_TYPE_OFFLINE; } switch (networkInfo.getType()) { case ConnectivityManager.TYPE_WIFI: return C.NETWORK_TYPE_WIFI; case ConnectivityManager.TYPE_WIMAX: return C.NETWORK_TYPE_4G; case ConnectivityManager.TYPE_MOBILE: case ConnectivityManager.TYPE_MOBILE_DUN: case ConnectivityManager.TYPE_MOBILE_HIPRI: return getMobileNetworkType(networkInfo); case ConnectivityManager.TYPE_ETHERNET: return C.NETWORK_TYPE_ETHERNET; default: // VPN, Bluetooth, Dummy. return C.NETWORK_TYPE_OTHER; } } /** * Returns the upper-case ISO 3166-1 alpha-2 country code of the current registered operator's MCC * (Mobile Country Code), or the country code of the default Locale if not available. * * @param context A context to access the telephony service. If null, only the Locale can be used. * @return The upper-case ISO 3166-1 alpha-2 country code, or an empty String if unavailable. */ public static String getCountryCode(@Nullable Context context) { if (context != null) { TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); if (telephonyManager != null) { String countryCode = telephonyManager.getNetworkCountryIso(); if (!TextUtils.isEmpty(countryCode)) { return toUpperInvariant(countryCode); } } } return toUpperInvariant(Locale.getDefault().getCountry()); } /** * Returns a non-empty array of normalized IETF BCP 47 language tags for the system languages * ordered by preference. */ public static String[] getSystemLanguageCodes() { String[] systemLocales = getSystemLocales(); for (int i = 0; i < systemLocales.length; i++) { systemLocales[i] = normalizeLanguageCode(systemLocales[i]); } return systemLocales; } /** * Uncompresses the data in {@code input}. * * @param input Wraps the compressed input data. * @param output Wraps an output buffer to be used to store the uncompressed data. If {@code * output.data} isn't big enough to hold the uncompressed data, a new array is created. If * {@code true} is returned then the output's position will be set to 0 and its limit will be * set to the length of the uncompressed data. * @param inflater If not null, used to uncompressed the input. Otherwise a new {@link Inflater} * is created. * @return Whether the input is uncompressed successfully. */ public static boolean inflate( ParsableByteArray input, ParsableByteArray output, @Nullable Inflater inflater) { if (input.bytesLeft() <= 0) { return false; } byte[] outputData = output.data; if (outputData.length < input.bytesLeft()) { outputData = new byte[2 * input.bytesLeft()]; } if (inflater == null) { inflater = new Inflater(); } inflater.setInput(input.data, input.getPosition(), input.bytesLeft()); try { int outputSize = 0; while (true) { outputSize += inflater.inflate(outputData, outputSize, outputData.length - outputSize); if (inflater.finished()) { output.reset(outputData, outputSize); return true; } if (inflater.needsDictionary() || inflater.needsInput()) { return false; } if (outputSize == outputData.length) { outputData = Arrays.copyOf(outputData, outputData.length * 2); } } } catch (DataFormatException e) { return false; } finally { inflater.reset(); } } /** * Returns whether the app is running on a TV device. * * @param context Any context. * @return Whether the app is running on a TV device. */ public static boolean isTv(Context context) { // See https://developer.android.com/training/tv/start/hardware.html#runtime-check. UiModeManager uiModeManager = (UiModeManager) context.getApplicationContext().getSystemService(UI_MODE_SERVICE); return uiModeManager != null && uiModeManager.getCurrentModeType() == Configuration.UI_MODE_TYPE_TELEVISION; } /** * Gets the physical size of the default display, in pixels. * * @param context Any context. * @return The physical display size, in pixels. */ public static Point getPhysicalDisplaySize(Context context) { WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); return getPhysicalDisplaySize(context, windowManager.getDefaultDisplay()); } /** * Gets the physical size of the specified display, in pixels. * * @param context Any context. * @param display The display whose size is to be returned. * @return The physical display size, in pixels. */ public static Point getPhysicalDisplaySize(Context context, Display display) { if (Util.SDK_INT <= 29 && display.getDisplayId() == Display.DEFAULT_DISPLAY && isTv(context)) { // On Android TVs it is common for the UI to be configured for a lower resolution than // SurfaceViews can output. Before API 26 the Display object does not provide a way to // identify this case, and up to and including API 28 many devices still do not correctly set // their hardware compositor output size. // Sony Android TVs advertise support for 4k output via a system feature. if ("Sony".equals(Util.MANUFACTURER) && Util.MODEL.startsWith("BRAVIA") && context.getPackageManager().hasSystemFeature("com.sony.dtv.hardware.panel.qfhd")) { return new Point(3840, 2160); } // Otherwise check the system property for display size. From API 28 treble may prevent the // system from writing sys.display-size so we check vendor.display-size instead. String displaySize = Util.SDK_INT < 28 ? getSystemProperty("sys.display-size") : getSystemProperty("vendor.display-size"); // If we managed to read the display size, attempt to parse it. if (!TextUtils.isEmpty(displaySize)) { try { String[] displaySizeParts = split(displaySize.trim(), "x"); if (displaySizeParts.length == 2) { int width = Integer.parseInt(displaySizeParts[0]); int height = Integer.parseInt(displaySizeParts[1]); if (width > 0 && height > 0) { return new Point(width, height); } } } catch (NumberFormatException e) { // Do nothing. } Log.e(TAG, "Invalid display size: " + displaySize); } } Point displaySize = new Point(); if (Util.SDK_INT >= 23) { getDisplaySizeV23(display, displaySize); } else if (Util.SDK_INT >= 17) { getDisplaySizeV17(display, displaySize); } else { getDisplaySizeV16(display, displaySize); } return displaySize; } /** * Extract renderer capabilities for the renderers created by the provided renderers factory. * * @param renderersFactory A {@link RenderersFactory}. * @param drmSessionManager An optional {@link DrmSessionManager} used by the renderers. * @return The {@link RendererCapabilities} for each renderer created by the {@code * renderersFactory}. */ public static RendererCapabilities[] getRendererCapabilities( RenderersFactory renderersFactory, @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) { Renderer[] renderers = renderersFactory.createRenderers( new Handler(), new VideoRendererEventListener() {}, new AudioRendererEventListener() {}, (cues) -> {}, (metadata) -> {}, drmSessionManager); RendererCapabilities[] capabilities = new RendererCapabilities[renderers.length]; for (int i = 0; i < renderers.length; i++) { capabilities[i] = renderers[i].getCapabilities(); } return capabilities; } /** * Returns a string representation of a {@code TRACK_TYPE_*} constant defined in {@link C}. * * @param trackType A {@code TRACK_TYPE_*} constant, * @return A string representation of this constant. */ public static String getTrackTypeString(int trackType) { switch (trackType) { case C.TRACK_TYPE_AUDIO: return "audio"; case C.TRACK_TYPE_DEFAULT: return "default"; case C.TRACK_TYPE_METADATA: return "metadata"; case C.TRACK_TYPE_CAMERA_MOTION: return "camera motion"; case C.TRACK_TYPE_NONE: return "none"; case C.TRACK_TYPE_TEXT: return "text"; case C.TRACK_TYPE_VIDEO: return "video"; default: return trackType >= C.TRACK_TYPE_CUSTOM_BASE ? "custom (" + trackType + ")" : "?"; } } @Nullable private static String getSystemProperty(String name) { try { @SuppressLint("PrivateApi") Class<?> systemProperties = Class.forName("android.os.SystemProperties"); Method getMethod = systemProperties.getMethod("get", String.class); return (String) getMethod.invoke(systemProperties, name); } catch (Exception e) { Log.e(TAG, "Failed to read system property " + name, e); return null; } } @TargetApi(23) private static void getDisplaySizeV23(Display display, Point outSize) { Display.Mode mode = display.getMode(); outSize.x = mode.getPhysicalWidth(); outSize.y = mode.getPhysicalHeight(); } @TargetApi(17) private static void getDisplaySizeV17(Display display, Point outSize) { display.getRealSize(outSize); } private static void getDisplaySizeV16(Display display, Point outSize) { display.getSize(outSize); } private static String[] getSystemLocales() { Configuration config = Resources.getSystem().getConfiguration(); return SDK_INT >= 24 ? getSystemLocalesV24(config) : new String[] {getLocaleLanguageTag(config.locale)}; } @TargetApi(24) private static String[] getSystemLocalesV24(Configuration config) { return Util.split(config.getLocales().toLanguageTags(), ","); } @TargetApi(21) private static String getLocaleLanguageTagV21(Locale locale) { return locale.toLanguageTag(); } @TargetApi(21) private static String normalizeLanguageCodeSyntaxV21(String languageTag) { return Locale.forLanguageTag(languageTag).toLanguageTag(); } private static @C.NetworkType int getMobileNetworkType(NetworkInfo networkInfo) { switch (networkInfo.getSubtype()) { case TelephonyManager.NETWORK_TYPE_EDGE: case TelephonyManager.NETWORK_TYPE_GPRS: return C.NETWORK_TYPE_2G; case TelephonyManager.NETWORK_TYPE_1xRTT: case TelephonyManager.NETWORK_TYPE_CDMA: case TelephonyManager.NETWORK_TYPE_EVDO_0: case TelephonyManager.NETWORK_TYPE_EVDO_A: case TelephonyManager.NETWORK_TYPE_EVDO_B: case TelephonyManager.NETWORK_TYPE_HSDPA: case TelephonyManager.NETWORK_TYPE_HSPA: case TelephonyManager.NETWORK_TYPE_HSUPA: case TelephonyManager.NETWORK_TYPE_IDEN: case TelephonyManager.NETWORK_TYPE_UMTS: case TelephonyManager.NETWORK_TYPE_EHRPD: case TelephonyManager.NETWORK_TYPE_HSPAP: case TelephonyManager.NETWORK_TYPE_TD_SCDMA: return C.NETWORK_TYPE_3G; case TelephonyManager.NETWORK_TYPE_LTE: return C.NETWORK_TYPE_4G; case TelephonyManager.NETWORK_TYPE_IWLAN: return C.NETWORK_TYPE_WIFI; case TelephonyManager.NETWORK_TYPE_GSM: case TelephonyManager.NETWORK_TYPE_UNKNOWN: default: // Future mobile network types. return C.NETWORK_TYPE_CELLULAR_UNKNOWN; } } private static HashMap<String, String> createIso3ToIso2Map() { String[] iso2Languages = Locale.getISOLanguages(); HashMap<String, String> iso3ToIso2 = new HashMap<>( /* initialCapacity= */ iso2Languages.length + iso3BibliographicalToIso2.length); for (String iso2 : iso2Languages) { try { // This returns the ISO 639-2/T code for the language. String iso3 = new Locale(iso2).getISO3Language(); if (!TextUtils.isEmpty(iso3)) { iso3ToIso2.put(iso3, iso2); } } catch (MissingResourceException e) { // Shouldn't happen for list of known languages, but we don't want to throw either. } } // Add additional ISO 639-2/B codes to mapping. for (int i = 0; i < iso3BibliographicalToIso2.length; i += 2) { iso3ToIso2.put(iso3BibliographicalToIso2[i], iso3BibliographicalToIso2[i + 1]); } return iso3ToIso2; } // See https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes. private static final String[] iso3BibliographicalToIso2 = new String[] { "alb", "sq", "arm", "hy", "baq", "eu", "bur", "my", "tib", "bo", "chi", "zh", "cze", "cs", "dut", "nl", "ger", "de", "gre", "el", "fre", "fr", "geo", "ka", "ice", "is", "mac", "mk", "mao", "mi", "may", "ms", "per", "fa", "rum", "ro", "slo", "sk", "wel", "cy" }; /** * Allows the CRC-32 calculation to be done byte by byte instead of bit per bit in the order "most * significant bit first". */ private static final int[] CRC32_BYTES_MSBF = { 0X00000000, 0X04C11DB7, 0X09823B6E, 0X0D4326D9, 0X130476DC, 0X17C56B6B, 0X1A864DB2, 0X1E475005, 0X2608EDB8, 0X22C9F00F, 0X2F8AD6D6, 0X2B4BCB61, 0X350C9B64, 0X31CD86D3, 0X3C8EA00A, 0X384FBDBD, 0X4C11DB70, 0X48D0C6C7, 0X4593E01E, 0X4152FDA9, 0X5F15ADAC, 0X5BD4B01B, 0X569796C2, 0X52568B75, 0X6A1936C8, 0X6ED82B7F, 0X639B0DA6, 0X675A1011, 0X791D4014, 0X7DDC5DA3, 0X709F7B7A, 0X745E66CD, 0X9823B6E0, 0X9CE2AB57, 0X91A18D8E, 0X95609039, 0X8B27C03C, 0X8FE6DD8B, 0X82A5FB52, 0X8664E6E5, 0XBE2B5B58, 0XBAEA46EF, 0XB7A96036, 0XB3687D81, 0XAD2F2D84, 0XA9EE3033, 0XA4AD16EA, 0XA06C0B5D, 0XD4326D90, 0XD0F37027, 0XDDB056FE, 0XD9714B49, 0XC7361B4C, 0XC3F706FB, 0XCEB42022, 0XCA753D95, 0XF23A8028, 0XF6FB9D9F, 0XFBB8BB46, 0XFF79A6F1, 0XE13EF6F4, 0XE5FFEB43, 0XE8BCCD9A, 0XEC7DD02D, 0X34867077, 0X30476DC0, 0X3D044B19, 0X39C556AE, 0X278206AB, 0X23431B1C, 0X2E003DC5, 0X2AC12072, 0X128E9DCF, 0X164F8078, 0X1B0CA6A1, 0X1FCDBB16, 0X018AEB13, 0X054BF6A4, 0X0808D07D, 0X0CC9CDCA, 0X7897AB07, 0X7C56B6B0, 0X71159069, 0X75D48DDE, 0X6B93DDDB, 0X6F52C06C, 0X6211E6B5, 0X66D0FB02, 0X5E9F46BF, 0X5A5E5B08, 0X571D7DD1, 0X53DC6066, 0X4D9B3063, 0X495A2DD4, 0X44190B0D, 0X40D816BA, 0XACA5C697, 0XA864DB20, 0XA527FDF9, 0XA1E6E04E, 0XBFA1B04B, 0XBB60ADFC, 0XB6238B25, 0XB2E29692, 0X8AAD2B2F, 0X8E6C3698, 0X832F1041, 0X87EE0DF6, 0X99A95DF3, 0X9D684044, 0X902B669D, 0X94EA7B2A, 0XE0B41DE7, 0XE4750050, 0XE9362689, 0XEDF73B3E, 0XF3B06B3B, 0XF771768C, 0XFA325055, 0XFEF34DE2, 0XC6BCF05F, 0XC27DEDE8, 0XCF3ECB31, 0XCBFFD686, 0XD5B88683, 0XD1799B34, 0XDC3ABDED, 0XD8FBA05A, 0X690CE0EE, 0X6DCDFD59, 0X608EDB80, 0X644FC637, 0X7A089632, 0X7EC98B85, 0X738AAD5C, 0X774BB0EB, 0X4F040D56, 0X4BC510E1, 0X46863638, 0X42472B8F, 0X5C007B8A, 0X58C1663D, 0X558240E4, 0X51435D53, 0X251D3B9E, 0X21DC2629, 0X2C9F00F0, 0X285E1D47, 0X36194D42, 0X32D850F5, 0X3F9B762C, 0X3B5A6B9B, 0X0315D626, 0X07D4CB91, 0X0A97ED48, 0X0E56F0FF, 0X1011A0FA, 0X14D0BD4D, 0X19939B94, 0X1D528623, 0XF12F560E, 0XF5EE4BB9, 0XF8AD6D60, 0XFC6C70D7, 0XE22B20D2, 0XE6EA3D65, 0XEBA91BBC, 0XEF68060B, 0XD727BBB6, 0XD3E6A601, 0XDEA580D8, 0XDA649D6F, 0XC423CD6A, 0XC0E2D0DD, 0XCDA1F604, 0XC960EBB3, 0XBD3E8D7E, 0XB9FF90C9, 0XB4BCB610, 0XB07DABA7, 0XAE3AFBA2, 0XAAFBE615, 0XA7B8C0CC, 0XA379DD7B, 0X9B3660C6, 0X9FF77D71, 0X92B45BA8, 0X9675461F, 0X8832161A, 0X8CF30BAD, 0X81B02D74, 0X857130C3, 0X5D8A9099, 0X594B8D2E, 0X5408ABF7, 0X50C9B640, 0X4E8EE645, 0X4A4FFBF2, 0X470CDD2B, 0X43CDC09C, 0X7B827D21, 0X7F436096, 0X7200464F, 0X76C15BF8, 0X68860BFD, 0X6C47164A, 0X61043093, 0X65C52D24, 0X119B4BE9, 0X155A565E, 0X18197087, 0X1CD86D30, 0X029F3D35, 0X065E2082, 0X0B1D065B, 0X0FDC1BEC, 0X3793A651, 0X3352BBE6, 0X3E119D3F, 0X3AD08088, 0X2497D08D, 0X2056CD3A, 0X2D15EBE3, 0X29D4F654, 0XC5A92679, 0XC1683BCE, 0XCC2B1D17, 0XC8EA00A0, 0XD6AD50A5, 0XD26C4D12, 0XDF2F6BCB, 0XDBEE767C, 0XE3A1CBC1, 0XE760D676, 0XEA23F0AF, 0XEEE2ED18, 0XF0A5BD1D, 0XF464A0AA, 0XF9278673, 0XFDE69BC4, 0X89B8FD09, 0X8D79E0BE, 0X803AC667, 0X84FBDBD0, 0X9ABC8BD5, 0X9E7D9662, 0X933EB0BB, 0X97FFAD0C, 0XAFB010B1, 0XAB710D06, 0XA6322BDF, 0XA2F33668, 0XBCB4666D, 0XB8757BDA, 0XB5365D03, 0XB1F740B4 }; /** * Allows the CRC-8 calculation to be done byte by byte instead of bit per bit in the order "most * significant bit first". */ private static final int[] CRC8_BYTES_MSBF = { 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3 }; }