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/*
* Copyright (C) 2015 The CyanogenMod 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.cyanogenmod.filemanager.util;
import android.media.MediaMetadataRetriever;
import android.util.Log;
import java.util.HashMap;
/**
* Provides the ability to determine the mimetype of a known file extension that can support
* multiple mimetypes.
*/
public abstract class AmbiguousExtensionHelper {
/**
* All available ambiguous extension helpers.
*/
public static final HashMap<String, AmbiguousExtensionHelper> AMBIGUOUS_EXTENSIONS_MAP = new
HashMap<String, AmbiguousExtensionHelper>();
static {
addAmbiguousHelperToMap(new ThreeGPExtensionHelper());
}
public abstract String getMimeType(String absolutePath, String extension);
public abstract String[] getSupportedExtensions();
private static void addAmbiguousHelperToMap(AmbiguousExtensionHelper instance) {
for(String extension : instance.getSupportedExtensions()) {
AmbiguousExtensionHelper.AMBIGUOUS_EXTENSIONS_MAP.put(extension, instance);
}
}
/**
* An AmbiguousExtensionHelper subclass that can distinguish the mimetype of a given
* .g3p, .g3pp, .3g2 or .3gpp2 file. The 3GP and 3G2 file formats support both audio and
* video, and a file with that extension has the possibility of multiple mimetypes, depending
* on the content of the file.
*/
public static class ThreeGPExtensionHelper extends AmbiguousExtensionHelper {
private static final String TAG = "ThreeGPExtensionHelper";
private static final String[] sSupportedExtensions = {"3gp", "3gpp", "3g2", "3gpp2"};
public static final String VIDEO_3GPP_MIME_TYPE = "video/3gpp";
public static final String AUDIO_3GPP_MIME_TYPE = "audio/3gpp";
public static final String VIDEO_3GPP2_MIME_TYPE = "video/3gpp2";
public static final String AUDIO_3GPP2_MIME_TYPE = "audio/3gpp2";
@Override
public String getMimeType(String absolutePath, String extension) {
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
try {
retriever.setDataSource(absolutePath);
boolean hasVideo =
retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO) !=
null;
if (is3GPP(extension)) {
return hasVideo ? VIDEO_3GPP_MIME_TYPE : AUDIO_3GPP_MIME_TYPE;
} else if (is3GPP2(extension)) {
return hasVideo ? VIDEO_3GPP2_MIME_TYPE : AUDIO_3GPP2_MIME_TYPE;
}
} catch (RuntimeException e) {
Log.e(TAG, "Unable to open 3GP file to determine mimetype");
} finally {
retriever.release();
}
// Default to video 3gp if the file is unreadable as this was the default before
// ambiguous resolution support was added.
return VIDEO_3GPP_MIME_TYPE;
}
@Override
public String[] getSupportedExtensions() {
return sSupportedExtensions;
}
private boolean is3GPP(String ext) {
return "3gp".equals(ext) || "3gpp".equals(ext);
}
private boolean is3GPP2(String ext) {
return "3g2".equals(ext) || "3gpp2".equals(ext);
}
}
}
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