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Fix saiz and senc sample count checks for FMP4

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Issue: #7592
PiperOrigin-RevId: 320556981
This commit is contained in:
kimvde 2020-07-10 08:19:49 +01:00 committed by kim-vde
parent fd3e10ed76
commit c29fc94540
1 changed files with 20 additions and 5 deletions
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23
library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/FragmentedMp4Extractor.java
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@ -809,8 +809,12 @@ public class FragmentedMp4Extractor implements Extractor {
int defaultSampleInfoSize = saiz.readUnsignedByte();
int sampleCount = saiz.readUnsignedIntToInt();
if (sampleCount != out.sampleCount) {
throw new ParserException("Length mismatch: " + sampleCount + ", " + out.sampleCount);
if (sampleCount > out.sampleCount) {
throw new ParserException(
"Saiz sample count "
+ sampleCount
+ " is greater than fragment sample count"
+ out.sampleCount);
}
int totalSize = 0;
@ -826,8 +830,11 @@ public class FragmentedMp4Extractor implements Extractor {
totalSize += defaultSampleInfoSize * sampleCount;
Arrays.fill(out.sampleHasSubsampleEncryptionTable, 0, sampleCount, subsampleEncryption);
}
Arrays.fill(out.sampleHasSubsampleEncryptionTable, sampleCount, out.sampleCount, false);
if (totalSize > 0) {
out.initEncryptionData(totalSize);
}
}
/**
* Parses a saio atom (defined in 14496-12).
@ -1068,8 +1075,16 @@ public class FragmentedMp4Extractor implements Extractor {
boolean subsampleEncryption = (flags & 0x02 /* use_subsample_encryption */) != 0;
int sampleCount = senc.readUnsignedIntToInt();
if (sampleCount != out.sampleCount) {
throw new ParserException("Length mismatch: " + sampleCount + ", " + out.sampleCount);
if (sampleCount == 0) {
// Samples are unencrypted.
Arrays.fill(out.sampleHasSubsampleEncryptionTable, 0, out.sampleCount, false);
return;
} else if (sampleCount != out.sampleCount) {
throw new ParserException(
"Senc sample count "
+ sampleCount
+ " is different from fragment sample count"
+ out.sampleCount);
}
Arrays.fill(out.sampleHasSubsampleEncryptionTable, 0, sampleCount, subsampleEncryption);