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* avcodec/jpeg2000dec: Merge i_stepsize/2 decoder special case into dequantMichael Niedermayer2015-06-281-2/+2
| | | | Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* avcodec/jpeg2000dwt: use 32x32->64 multiplies in the 9/7i DWTMichael Niedermayer2015-06-221-2/+2
| | | | | | | This significantly improves the quality when the integer 9/7 transform is used Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* avcodec/jpeg2000: Move H band scaling from wavelet into quantization codeMichael Niedermayer2015-06-221-2/+2
| | | | | | | This reduces the number of operations done and is equivalent except for rounding Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* avcodec/jpeg2000: Move gainb handling into the quantization codeMichael Niedermayer2015-06-221-2/+2
| | | | | | | | 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>
* avcodec/jpeg2000dwt: Fix value of F_LFTG_X and I_LFTG_XMichael Niedermayer2015-06-211-2/+2
| | | | | | | | 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>
* JPEG 2000 decoder for DCinemaNicolas Bertrand2013-04-221-0/+3
Based on the 2007 GSoC project from Kamil Nowosad <k.nowosad@students.mimuw.edu.pl> Updated to current programming standards, style and many more small fixes by Diego Biurrun <diego@biurrun.de>. Signed-off-by: Diego Biurrun <diego@biurrun.de>
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