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/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.text;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.cea.Cea608Decoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.cea.Cea708Decoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.dvb.DvbDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.pgs.PgsDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.ssa.SsaDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.subrip.SubripDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.ttml.TtmlDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.tx3g.Tx3gDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.webvtt.Mp4WebvttDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.webvtt.WebvttDecoder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes;
/**
* A factory for {@link SubtitleDecoder} instances.
*/
public interface SubtitleDecoderFactory {
/**
* Returns whether the factory is able to instantiate a {@link SubtitleDecoder} for the given
* {@link Format}.
*
* @param format The {@link Format}.
* @return Whether the factory can instantiate a suitable {@link SubtitleDecoder}.
*/
boolean supportsFormat(Format format);
/**
* Creates a {@link SubtitleDecoder} for the given {@link Format}.
*
* @param format The {@link Format}.
* @return A new {@link SubtitleDecoder}.
* @throws IllegalArgumentException If the {@link Format} is not supported.
*/
SubtitleDecoder createDecoder(Format format);
/**
* Default {@link SubtitleDecoderFactory} implementation.
*
* <p>The formats supported by this factory are:
*
* <ul>
* <li>WebVTT ({@link WebvttDecoder})
* <li>WebVTT (MP4) ({@link Mp4WebvttDecoder})
* <li>TTML ({@link TtmlDecoder})
* <li>SubRip ({@link SubripDecoder})
* <li>SSA/ASS ({@link SsaDecoder})
* <li>TX3G ({@link Tx3gDecoder})
* <li>Cea608 ({@link Cea608Decoder})
* <li>Cea708 ({@link Cea708Decoder})
* <li>DVB ({@link DvbDecoder})
* <li>PGS ({@link PgsDecoder})
* </ul>
*/
SubtitleDecoderFactory DEFAULT =
new SubtitleDecoderFactory() {
@Override
public boolean supportsFormat(Format format) {
@Nullable String mimeType = format.sampleMimeType;
return MimeTypes.TEXT_VTT.equals(mimeType)
|| MimeTypes.TEXT_SSA.equals(mimeType)
|| MimeTypes.APPLICATION_TTML.equals(mimeType)
|| MimeTypes.APPLICATION_MP4VTT.equals(mimeType)
|| MimeTypes.APPLICATION_SUBRIP.equals(mimeType)
|| MimeTypes.APPLICATION_TX3G.equals(mimeType)
|| MimeTypes.APPLICATION_CEA608.equals(mimeType)
|| MimeTypes.APPLICATION_MP4CEA608.equals(mimeType)
|| MimeTypes.APPLICATION_CEA708.equals(mimeType)
|| MimeTypes.APPLICATION_DVBSUBS.equals(mimeType)
|| MimeTypes.APPLICATION_PGS.equals(mimeType);
}
@Override
public SubtitleDecoder createDecoder(Format format) {
@Nullable String mimeType = format.sampleMimeType;
if (mimeType != null) {
switch (mimeType) {
case MimeTypes.TEXT_VTT:
return new WebvttDecoder();
case MimeTypes.TEXT_SSA:
return new SsaDecoder(format.initializationData);
case MimeTypes.APPLICATION_MP4VTT:
return new Mp4WebvttDecoder();
case MimeTypes.APPLICATION_TTML:
return new TtmlDecoder();
case MimeTypes.APPLICATION_SUBRIP:
return new SubripDecoder();
case MimeTypes.APPLICATION_TX3G:
return new Tx3gDecoder(format.initializationData);
case MimeTypes.APPLICATION_CEA608:
case MimeTypes.APPLICATION_MP4CEA608:
return new Cea608Decoder(mimeType, format.accessibilityChannel);
case MimeTypes.APPLICATION_CEA708:
return new Cea708Decoder(format.accessibilityChannel, format.initializationData);
case MimeTypes.APPLICATION_DVBSUBS:
return new DvbDecoder(format.initializationData);
case MimeTypes.APPLICATION_PGS:
return new PgsDecoder();
default:
break;
}
}
throw new IllegalArgumentException(
"Attempted to create decoder for unsupported MIME type: " + mimeType);
}
};
}
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