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Handle the case when MP4 file header has zero bitrate

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This incorporates [6ca536b5] (mp4 properties: handle the case when
mp4 file header has zero bitrate) from PR #899 with a more accurate
bitrate calculation and a unit test.
This commit is contained in:
Urs Fleisch
2020-12-27 10:17:34 +01:00
parent 3d71ea1ad2
commit 563fbaf82a
2 changed files with 31 additions and 1 deletions
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9
taglib/mp4/mp4properties.cpp
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@ -234,7 +234,14 @@ MP4::Properties::read(File *file, Atoms *atoms)
pos += 3;
}
pos += 10;
d->bitrate = static_cast<int>((data.toUInt(pos) + 500) / 1000.0 + 0.5);
const unsigned int bitrateValue = data.toUInt(pos);
if(bitrateValue != 0 || d->length <= 0) {
d->bitrate = static_cast<int>((bitrateValue + 500) / 1000.0 + 0.5);
}
else {
d->bitrate = static_cast<int>(
(calculateMdatLength(atoms->atoms) * 8) / d->length);
}
}
}
}