c9706f0262
1440173 [NJ-1331] MetaData utility parse the wrong m4a meta data. Changes to Java, application side.
260 lines
10 KiB
Java
260 lines
10 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.res.AssetFileDescriptor;
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import android.graphics.Bitmap;
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import android.net.Uri;
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import android.os.ParcelFileDescriptor;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.FileNotFoundException;
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/**
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* MediaMetadataRetriever class provides a unified interface for retrieving
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* frame and meta data from an input media file.
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* {@hide}
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*/
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public class MediaMetadataRetriever
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{
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static {
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System.loadLibrary("media_jni");
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native_init();
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}
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// The field below is accessed by native methods
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@SuppressWarnings("unused")
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private int mNativeContext;
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public MediaMetadataRetriever() {
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native_setup();
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}
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/**
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* Call this method before setDataSource() so that the mode becomes
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* effective for subsequent operations. This method can be called only once
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* at the beginning if the intended mode of operation for a
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* MediaMetadataRetriever object remains the same for its whole lifetime,
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* and thus it is unnecessary to call this method each time setDataSource()
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* is called. If this is not never called (which is allowed), by default the
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* intended mode of operation is to both capture frame and retrieve meta
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* data (i.e., MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY).
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* Often, this may not be what one wants, since doing this has negative
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* performance impact on execution time of a call to setDataSource(), since
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* both types of operations may be time consuming.
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*
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* @param mode The intended mode of operation. Can be any combination of
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* MODE_GET_METADATA_ONLY and MODE_CAPTURE_FRAME_ONLY:
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* 1. MODE_GET_METADATA_ONLY & MODE_CAPTURE_FRAME_ONLY:
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* For neither frame capture nor meta data retrieval
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* 2. MODE_GET_METADATA_ONLY: For meta data retrieval only
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* 3. MODE_CAPTURE_FRAME_ONLY: For frame capture only
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* 4. MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY:
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* For both frame capture and meta data retrieval
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*/
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public native void setMode(int mode);
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/**
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* @return the current mode of operation. A negative return value indicates
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* some runtime error has occurred.
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*/
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public native int getMode();
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/**
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* Sets the data source (file pathname) to use. Call this
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* method before the rest of the methods in this class. This method may be
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* time-consuming.
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*
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* @param path The path of the input media file.
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* @throws IllegalArgumentException If the path is invalid.
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*/
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public native void setDataSource(String path) throws IllegalArgumentException;
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/**
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* Sets the data source (FileDescriptor) to use. It is the caller's
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* responsibility to close the file descriptor. It is safe to do so as soon
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* as this call returns. Call this method before the rest of the methods in
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* this class. This method may be time-consuming.
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*
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* @param fd the FileDescriptor for the file you want to play
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* @param offset the offset into the file where the data to be played starts,
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* in bytes. It must be non-negative
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* @param length the length in bytes of the data to be played. It must be
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* non-negative.
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* @throws IllegalArgumentException if the arguments are invalid
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*/
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public native void setDataSource(FileDescriptor fd, long offset, long length)
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throws IllegalArgumentException;
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/**
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* Sets the data source (FileDescriptor) to use. It is the caller's
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* responsibility to close the file descriptor. It is safe to do so as soon
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* as this call returns. Call this method before the rest of the methods in
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* this class. This method may be time-consuming.
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*
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* @param fd the FileDescriptor for the file you want to play
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* @throws IllegalArgumentException if the FileDescriptor is invalid
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*/
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public void setDataSource(FileDescriptor fd)
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throws IllegalArgumentException {
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// intentionally less than LONG_MAX
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setDataSource(fd, 0, 0x7ffffffffffffffL);
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}
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/**
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* Sets the data source as a content Uri. Call this method before
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* the rest of the methods in this class. This method may be time-consuming.
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*
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* @param context the Context to use when resolving the Uri
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* @param uri the Content URI of the data you want to play
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* @throws IllegalArgumentException if the Uri is invalid
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* @throws SecurityException if the Uri cannot be used due to lack of
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* permission.
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*/
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public void setDataSource(Context context, Uri uri)
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throws IllegalArgumentException, SecurityException {
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if (uri == null) {
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throw new IllegalArgumentException();
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}
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String scheme = uri.getScheme();
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if(scheme == null || scheme.equals("file")) {
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setDataSource(uri.getPath());
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return;
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}
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AssetFileDescriptor fd = null;
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try {
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ContentResolver resolver = context.getContentResolver();
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try {
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fd = resolver.openAssetFileDescriptor(uri, "r");
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} catch(FileNotFoundException e) {
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throw new IllegalArgumentException();
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}
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if (fd == null) {
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throw new IllegalArgumentException();
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}
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FileDescriptor descriptor = fd.getFileDescriptor();
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if (!descriptor.valid()) {
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throw new IllegalArgumentException();
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}
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// Note: using getDeclaredLength so that our behavior is the same
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// as previous versions when the content provider is returning
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// a full file.
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if (fd.getDeclaredLength() < 0) {
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setDataSource(descriptor);
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} else {
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setDataSource(descriptor, fd.getStartOffset(), fd.getDeclaredLength());
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}
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return;
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} catch (SecurityException ex) {
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} finally {
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try {
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if (fd != null) {
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fd.close();
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}
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} catch(IOException ioEx) {
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}
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}
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setDataSource(uri.toString());
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}
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/**
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* Call this method after setDataSource(). This method retrieves the
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* meta data value associated with the keyCode.
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*
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* The keyCode currently supported is listed below as METADATA_XXX
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* constants. With any other value, it returns a null pointer.
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*
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* @param keyCode One of the constants listed below at the end of the class.
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* @return The meta data value associate with the given keyCode on success;
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* null on failure.
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*/
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public native String extractMetadata(int keyCode);
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/**
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* Call this method after setDataSource(). This method finds a
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* representative frame if successful and returns it as a bitmap. This is
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* useful for generating a thumbnail for an input media source.
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*
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* @return A Bitmap containing a representative video frame, which
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* can be null, if such a frame cannot be retrieved.
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*/
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public native Bitmap captureFrame();
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/**
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* Call this method after setDataSource(). This method finds the optional
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* graphic or album art associated (embedded or external url linked) the
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* related data source.
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*
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* @return null if no such graphic is found.
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*/
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public native byte[] extractAlbumArt();
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/**
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* Call it when one is done with the object. This method releases the memory
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* allocated internally.
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*/
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public native void release();
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private native void native_setup();
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private static native void native_init();
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private native final void native_finalize();
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@Override
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protected void finalize() throws Throwable {
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try {
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native_finalize();
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} finally {
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super.finalize();
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}
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}
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public static final int MODE_GET_METADATA_ONLY = 0x01;
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public static final int MODE_CAPTURE_FRAME_ONLY = 0x02;
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/*
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* Do not change these values without updating their counterparts
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* in include/media/mediametadataretriever.h!
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*/
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public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;
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public static final int METADATA_KEY_ALBUM = 1;
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public static final int METADATA_KEY_ARTIST = 2;
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public static final int METADATA_KEY_AUTHOR = 3;
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public static final int METADATA_KEY_COMPOSER = 4;
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public static final int METADATA_KEY_DATE = 5;
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public static final int METADATA_KEY_GENRE = 6;
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public static final int METADATA_KEY_TITLE = 7;
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public static final int METADATA_KEY_YEAR = 8;
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public static final int METADATA_KEY_DURATION = 9;
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public static final int METADATA_KEY_NUM_TRACKS = 10;
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public static final int METADATA_KEY_IS_DRM_CRIPPLED = 11;
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public static final int METADATA_KEY_CODEC = 12;
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public static final int METADATA_KEY_RATING = 13;
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public static final int METADATA_KEY_COMMENT = 14;
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public static final int METADATA_KEY_COPYRIGHT = 15;
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public static final int METADATA_KEY_BIT_RATE = 16;
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public static final int METADATA_KEY_FRAME_RATE = 17;
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public static final int METADATA_KEY_VIDEO_FORMAT = 18;
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public static final int METADATA_KEY_VIDEO_HEIGHT = 19;
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public static final int METADATA_KEY_VIDEO_WIDTH = 20;
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public static final int METADATA_KEY_WRITER = 21;
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// Add more here...
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}
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