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/*
* Copyright (C) 2017 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 org.mozilla.thirdparty.com.google.android.exoplayer2.metadata;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.emsg.EventMessageDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.icy.IcyDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.id3.Id3Decoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.scte35.SpliceInfoDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes;
/**
* A factory for {@link MetadataDecoder} instances.
*/
public interface MetadataDecoderFactory {
/**
* Returns whether the factory is able to instantiate a {@link MetadataDecoder} for the given
* {@link Format}.
*
* @param format The {@link Format}.
* @return Whether the factory can instantiate a suitable {@link MetadataDecoder}.
*/
boolean supportsFormat(Format format);
/**
* Creates a {@link MetadataDecoder} for the given {@link Format}.
*
* @param format The {@link Format}.
* @return A new {@link MetadataDecoder}.
* @throws IllegalArgumentException If the {@link Format} is not supported.
*/
MetadataDecoder createDecoder(Format format);
/**
* Default {@link MetadataDecoder} implementation.
*
* <p>The formats supported by this factory are:
*
* <ul>
* <li>ID3 ({@link Id3Decoder})
* <li>EMSG ({@link EventMessageDecoder})
* <li>SCTE-35 ({@link SpliceInfoDecoder})
* <li>ICY ({@link IcyDecoder})
* </ul>
*/
MetadataDecoderFactory DEFAULT =
new MetadataDecoderFactory() {
@Override
public boolean supportsFormat(Format format) {
@Nullable String mimeType = format.sampleMimeType;
return MimeTypes.APPLICATION_ID3.equals(mimeType)
|| MimeTypes.APPLICATION_EMSG.equals(mimeType)
|| MimeTypes.APPLICATION_SCTE35.equals(mimeType)
|| MimeTypes.APPLICATION_ICY.equals(mimeType);
}
@Override
public MetadataDecoder createDecoder(Format format) {
@Nullable String mimeType = format.sampleMimeType;
if (mimeType != null) {
switch (mimeType) {
case MimeTypes.APPLICATION_ID3:
return new Id3Decoder();
case MimeTypes.APPLICATION_EMSG:
return new EventMessageDecoder();
case MimeTypes.APPLICATION_SCTE35:
return new SpliceInfoDecoder();
case MimeTypes.APPLICATION_ICY:
return new IcyDecoder();
default:
break;
}
}
throw new IllegalArgumentException(
"Attempted to create decoder for unsupported MIME type: " + mimeType);
}
};
}
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