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/*
* Copyright (C) 2014 Yuya Tanaka
*
* 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 net.ypresto.androidtranscoder.compat;
import android.media.MediaCodecInfo;
import android.media.MediaCodecList;
import android.media.MediaFormat;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* This class emulates basic behavior of MediaCodecList in API level >= 21.
* TODO: implement delegate to MediaCodecList in newer API.
*/
public class MediaCodecListCompat {
public static final int REGULAR_CODECS = 0;
public static final int ALL_CODECS = 1;
public MediaCodecListCompat(int kind) {
if (kind != REGULAR_CODECS) {
throw new UnsupportedOperationException("kind other than REGULAR_CODECS is not implemented.");
}
}
public final String findDecoderForFormat(MediaFormat format) {
return findCoderForFormat(format, false);
}
public final String findEncoderForFormat(MediaFormat format) {
return findCoderForFormat(format, true);
}
private String findCoderForFormat(MediaFormat format, boolean findEncoder) {
String mimeType = format.getString(MediaFormat.KEY_MIME);
Iterator<MediaCodecInfo> iterator = new MediaCodecInfoIterator();
while (iterator.hasNext()) {
MediaCodecInfo codecInfo = iterator.next();
if (codecInfo.isEncoder() != findEncoder) continue;
if (Arrays.asList(codecInfo.getSupportedTypes()).contains(mimeType)) {
return codecInfo.getName();
}
}
return null;
}
public final MediaCodecInfo[] getCodecInfos() {
int codecCount = getCodecCount();
MediaCodecInfo[] codecInfos = new MediaCodecInfo[codecCount];
Iterator<MediaCodecInfo> iterator = new MediaCodecInfoIterator();
for (int i = 0; i < codecCount; i++) {
codecInfos[i] = getCodecInfoAt(i);
}
return codecInfos;
}
private static int getCodecCount() {
return MediaCodecList.getCodecCount();
}
private static MediaCodecInfo getCodecInfoAt(int index) {
return MediaCodecList.getCodecInfoAt(index);
}
private final class MediaCodecInfoIterator implements Iterator<MediaCodecInfo> {
private int mCodecCount = getCodecCount();
private int mIndex = -1;
@Override
public boolean hasNext() {
return mIndex + 1 < mCodecCount;
}
@Override
public MediaCodecInfo next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
mIndex++;
return getCodecInfoAt(mIndex);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}
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