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| author | Alex Converse <alex.converse@gmail.com> | 2012-01-24 18:43:43 -0800 |
|---|---|---|
| committer | Alex Converse <alex.converse@gmail.com> | 2012-01-25 12:31:37 -0800 |
| commit | d78bb1a4b2a3a415b68e4e6dd448779eccec64e3 (patch) | |
| tree | c49f75a42d7ea1fff4a8121e18efd4b60071e194 | |
| parent | 9f9c45f4b635457543a3bc37b09a679daa9dabea (diff) | |
| download | ffmpeg-d78bb1a4b2a3a415b68e4e6dd448779eccec64e3.tar.gz | |
wma: Clip WMA1 and WMA2 frame length to 11 bits.
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
| -rw-r--r-- | libavcodec/wma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/wma.c b/libavcodec/wma.c index 4cdffcd101..d82fde7b18 100644 --- a/libavcodec/wma.c +++ b/libavcodec/wma.c @@ -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; |