Michael Niedermayer
b1fdf81c6e
avcodec/jpeg2000dwt: use 32x32->64 multiplies in the 9/7i DWT
...
This significantly improves the quality when the integer 9/7 transform
is used
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-22 02:27:50 +02:00
Michael Niedermayer
6c7b1597c7
avcodec/jpeg2000: Move H band scaling from wavelet into quantization code
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This reduces the number of operations done and is equivalent except for
rounding
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-22 02:00:57 +02:00
Michael Niedermayer
1c495b0bf6
avcodec/jpeg2000: Move gainb handling into the quantization code
...
thats how the specification defines it, this also improves numerical
accuracy of the integer wavelet implementation. It otherwise should
be equivalent, in case of overflows this can be reverted.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-22 01:36:05 +02:00
Michael Niedermayer
3bcf61f495
avcodec/jpeg2000dwt: Fix value of F_LFTG_X and I_LFTG_X
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Even if the jpeg2000 spec uses a wrong value this does not
make mathematics work this way, also this has been corrected in the 2004
version AFAIK
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-21 19:25:35 +02:00
Michael Niedermayer
75651cd63f
avcodec/jpeg2000dwt: Fix order of operations in integer decomposition wavelets
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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-20 00:53:56 +02:00
Michael Niedermayer
7e2bdea764
avcodec/j2kenc: Use JP2 format by default
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Without the JP2 fields its not possible to identify the colorspace
Fixes Ticket538
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-19 21:56:57 +02:00
Michael Niedermayer
4624656797
avcodec/j2kenc: Properly flush the end of the truncated AC stream
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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-17 20:39:03 +02:00
Michael Niedermayer
adfde9a646
avformat/avienc: Fix wrongly placed comment
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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-03-19 17:30:28 +01:00
Christophe Gisquet
8d02a55b1b
tests: add a third, 34x34, target
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This should exercise the corner cases of numerous codecs.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-06-10 20:24:49 +02:00
