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This is analogous to what we do for text/subtitles, and adds support for playlists where the type of metadata changes from one playlist item to the next. Issue: #2176 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=143948307
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library/src/main/java/com/google/android/exoplayer2/metadata/MetadataDecoderFactory.java
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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 com.google.android.exoplayer2.metadata; | ||
|
|
||
| import com.google.android.exoplayer2.Format; | ||
| import com.google.android.exoplayer2.metadata.emsg.EventMessageDecoder; | ||
| import com.google.android.exoplayer2.metadata.id3.Id3Decoder; | ||
| import com.google.android.exoplayer2.metadata.scte35.SpliceInfoDecoder; | ||
| import com.google.android.exoplayer2.util.MimeTypes; | ||
|
|
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| /** | ||
| * A factory for {@link MetadataDecoder} instances. | ||
| */ | ||
| public interface MetadataDecoderFactory { | ||
|
|
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| /** | ||
| * 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); | ||
|
|
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| /** | ||
| * 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); | ||
|
|
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| /** | ||
| * Default {@link MetadataDecoder} implementation. | ||
| * <p> | ||
| * The formats supported by this factory are: | ||
| * <ul> | ||
| * <li>ID3 ({@link Id3Decoder})</li> | ||
| * <li>EMSG ({@link EventMessageDecoder})</li> | ||
| * <li>SCTE-35 ({@link SpliceInfoDecoder})</li> | ||
| * </ul> | ||
| */ | ||
| MetadataDecoderFactory DEFAULT = new MetadataDecoderFactory() { | ||
|
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| @Override | ||
| public boolean supportsFormat(Format format) { | ||
| return getDecoderClass(format.sampleMimeType) != null; | ||
| } | ||
|
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| @Override | ||
| public MetadataDecoder createDecoder(Format format) { | ||
| try { | ||
| Class<?> clazz = getDecoderClass(format.sampleMimeType); | ||
| if (clazz == null) { | ||
| throw new IllegalArgumentException("Attempted to create decoder for unsupported format"); | ||
| } | ||
| return clazz.asSubclass(MetadataDecoder.class).getConstructor().newInstance(); | ||
| } catch (Exception e) { | ||
| throw new IllegalStateException("Unexpected error instantiating decoder", e); | ||
| } | ||
| } | ||
|
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| private Class<?> getDecoderClass(String mimeType) { | ||
| if (mimeType == null) { | ||
| return null; | ||
| } | ||
| try { | ||
| switch (mimeType) { | ||
| case MimeTypes.APPLICATION_ID3: | ||
| return Class.forName("com.google.android.exoplayer2.metadata.id3.Id3Decoder"); | ||
| case MimeTypes.APPLICATION_EMSG: | ||
| return Class.forName("com.google.android.exoplayer2.metadata.emsg.EventMessageDecoder"); | ||
| case MimeTypes.APPLICATION_SCTE35: | ||
| return Class.forName("com.google.android.exoplayer2.metadata.scte35.SpliceInfoDecoder"); | ||
| default: | ||
| return null; | ||
| } | ||
| } catch (ClassNotFoundException e) { | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| }; | ||
|
|
||
| } |
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