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wma: Clip WMA1 and WMA2 frame length to 11 bits.

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The MDCT buffers in the decoder are only sized for up to 11 bits. The
reverse engineered documentation for WMA1/2 headers say that that for
all samplerates above 32kHz 11 bits are used. 12 and 13 bit support
were added for WMAPro. I was unable to make any Microsoft tools generate
a test file at a samplerate above 48kHz.

Discovered by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind

CC: libav-stable@libav.org
This commit is contained in:
Alex Converse 2012-01-24 18:43:43 -08:00
parent 9f9c45f4b6
commit d78bb1a4b2
1 changed files with 1 additions and 1 deletions
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2
libavcodec/wma.c
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@ -85,7 +85,7 @@ int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
} else if (sample_rate <= 22050 ||
(sample_rate <= 32000 && version == 1)) {
frame_len_bits = 10;
} else if (sample_rate <= 48000) {
} else if (sample_rate <= 48000 || version < 3) {
frame_len_bits = 11;
} else if (sample_rate <= 96000) {
frame_len_bits = 12;