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Reduce MP3 detection false positives

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Vanilagy
2025-07-11 10:07:45 +02:00
parent 9072a7a9f7
commit 514a533445
3 changed files with 10 additions and 4 deletions
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src/input-format.ts
+5 -3
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@@ -13,6 +13,7 @@ import { IsobmffReader } from './isobmff/isobmff-reader';
import { EBMLId, EBMLReader } from './matroska/ebml';
import { MatroskaDemuxer } from './matroska/matroska-demuxer';
import { Mp3Demuxer } from './mp3/mp3-demuxer';
import { FRAME_HEADER_SIZE } from './mp3/mp3-misc';
import { Mp3Reader } from './mp3/mp3-reader';
import { OggDemuxer } from './ogg/ogg-demuxer';
import { OggReader } from './ogg/ogg-reader';
@@ -245,9 +246,10 @@ export class Mp3InputFormat extends InputFormat {
}
// Fine, we found one frame header, but we're still not entirely sure this is MP3. Let's check if we can find
// another header nearby:
// another header right after it:
mp3Reader.pos = firstHeader.startPos + firstHeader.totalSize;
const secondHeader = mp3Reader.readNextFrameHeader(Math.min(framesStartPos + 4096, sourceSize));
await mp3Reader.reader.loadRange(mp3Reader.pos, mp3Reader.pos + FRAME_HEADER_SIZE);
const secondHeader = mp3Reader.readNextFrameHeader(mp3Reader.pos + FRAME_HEADER_SIZE);
if (!secondHeader) {
return false;
}
@@ -257,7 +259,7 @@ export class Mp3InputFormat extends InputFormat {
return false;
}
// We have found two matching MP3 frames, a strong indicator that this is an MP3 file
// We have found two matching consecutive MP3 frames, a strong indicator that this is an MP3 file
return true;
}