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Paranoia change: Prevent possible assertion caused by MP3Stream.

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Currently we have an assert checking that the framerate of an
Audio::Timestamp is always > 0. Since MAD might return "0"
(and maybe even other illegal values) in case the MP3 stream is
invalid we need to check that before we setup the _length
Timestamp of MP3Stream.

svn-id: r48904
This commit is contained in:
Johannes Schickel 2010-05-03 13:03:44 +00:00
parent df679afe19
commit f2ee496c0e
1 changed files with 8 additions and 1 deletions
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7
sound/decoders/mp3.cpp
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@ -114,6 +114,13 @@ MP3Stream::MP3Stream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag
while (_state != MP3_STATE_EOS)
readHeader();
// To rule out any invalid sample rate to be encountered here, say in case the
// MP3 stream is invalid, we just check the MAD error code here.
// We need to assure this, since else we might trigger an assertion in Timestamp
// (When getRate() returns 0 or a negative number to be precise).
// Note that we allow "MAD_ERROR_BUFLEN" as error code here, since according
// to mad.h it is also set on EOF.
if ((_stream.error == MAD_ERROR_NONE || _stream.error == MAD_ERROR_BUFLEN) && getRate() > 0)
_length = Timestamp(mad_timer_count(_totalTime, MAD_UNITS_MILLISECONDS), getRate());
deinitStream();