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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java')
-rw-r--r-- | mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java new file mode 100644 index 0000000000..a0a26c76d8 --- /dev/null +++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/Id3Peeker.java @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2018 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.extractor; + +import androidx.annotation.Nullable; +import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.Metadata; +import org.mozilla.thirdparty.com.google.android.exoplayer2.metadata.id3.Id3Decoder; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray; +import java.io.EOFException; +import java.io.IOException; + +/** + * Peeks data from the beginning of an {@link ExtractorInput} to determine if there is any ID3 tag. + */ +public final class Id3Peeker { + + private final ParsableByteArray scratch; + + public Id3Peeker() { + scratch = new ParsableByteArray(Id3Decoder.ID3_HEADER_LENGTH); + } + + /** + * Peeks ID3 data from the input and parses the first ID3 tag. + * + * @param input The {@link ExtractorInput} from which data should be peeked. + * @param id3FramePredicate Determines which ID3 frames are decoded. May be null to decode all + * frames. + * @return The first ID3 tag decoded into a {@link Metadata} object. May be null if ID3 tag is not + * present in the input. + * @throws IOException If an error occurred peeking from the input. + * @throws InterruptedException If the thread was interrupted. + */ + @Nullable + public Metadata peekId3Data( + ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate) + throws IOException, InterruptedException { + int peekedId3Bytes = 0; + Metadata metadata = null; + while (true) { + try { + input.peekFully(scratch.data, /* offset= */ 0, Id3Decoder.ID3_HEADER_LENGTH); + } catch (EOFException e) { + // If input has less than ID3_HEADER_LENGTH, ignore the rest. + break; + } + scratch.setPosition(0); + if (scratch.readUnsignedInt24() != Id3Decoder.ID3_TAG) { + // Not an ID3 tag. + break; + } + scratch.skipBytes(3); // Skip major version, minor version and flags. + int framesLength = scratch.readSynchSafeInt(); + int tagLength = Id3Decoder.ID3_HEADER_LENGTH + framesLength; + + if (metadata == null) { + byte[] id3Data = new byte[tagLength]; + System.arraycopy(scratch.data, 0, id3Data, 0, Id3Decoder.ID3_HEADER_LENGTH); + input.peekFully(id3Data, Id3Decoder.ID3_HEADER_LENGTH, framesLength); + + metadata = new Id3Decoder(id3FramePredicate).decode(id3Data, tagLength); + } else { + input.advancePeekPosition(framesLength); + } + + peekedId3Bytes += tagLength; + } + + input.resetPeekPosition(); + input.advancePeekPosition(peekedId3Bytes); + return metadata; + } +} |