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Parsing of unsupported MP3 streams improved

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- For supported MP3 streams, all frame header information must be the
same for the whole stream.
- For unsupported MP3 streams, this has been removed and only the stream
type has to be the same. This will lead to some more false positives,
but give longer streams, so the log is not bloated with thousands small
false positives
This commit is contained in:
Christian Schneider 2016-04-11 13:26:35 +02:00
parent 68801a29ad
commit c8dc5a0980
1 changed files with 13 additions and 7 deletions
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20
precomp.cpp
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@ -3705,13 +3705,19 @@ bool compress_file(float min_percent, float max_percent) {
if ((type != MPEG1_LAYER_III) && (saved_input_file_pos <= suppress_mp3_type_until[type])) {
break;
}
} else if (
(mpeg != ((in[1] >> 3) & 0x3)) ||
(layer != ((in[1] >> 1) & 0x3)) ||
(protection != ((in[1] >> 0) & 0x1)) ||
(samples != ((in[2] >> 2) & 0x3)) ||
(channels != ((in[3] >> 6) & 0x3)) ||
(type != MBITS( in[1], 5, 1))) break;
} else {
if (type == MPEG1_LAYER_III) { // supported MP3 type, all header information must be identical to the first frame
if (
(mpeg != ((in[1] >> 3) & 0x3)) ||
(layer != ((in[1] >> 1) & 0x3)) ||
(protection != ((in[1] >> 0) & 0x1)) ||
(samples != ((in[2] >> 2) & 0x3)) ||
(channels != ((in[3] >> 6) & 0x3)) ||
(type != MBITS( in[1], 5, 1))) break;
} else { // unsupported type, compare only type, ignore the other header information to get a longer stream
if (type != MBITS( in[1], 5, 1)) break;
}
}
bits = (in[2] >> 4) & 0xF;
padding = (in[2] >> 1) & 0x1;