On Thu, Jan 28, 2016 at 08:53:00PM +0000, Kieran Kunhya wrote: > Decodes YUV 4:2:2 10-bit and RGB 12-bit files. > Older files with more subbands, skips, Bayer, alpha not supported. > Alpha requires addition of GBRAP12 pixel format. [...]
> +static inline int dequant_and_decompand(int level, int quantisation)
> +{
> + int64_t abslevel = abs(level);
> + return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255
> * 255))) * FFSIGN(level) * quantisation;
> +}
the expression before "* quantisation", including abs() can be
replaced by a LUT i think
or maybe merged into the VLC table
which would be faster
[...]
> + } else if (tag == 2) {
> + av_log(avctx, AV_LOG_DEBUG, "tag=2 header - skipping %i
> tag/value pairs \n", data);
> + for (i = 0; i < data; i++) {
> + av_log(avctx, AV_LOG_DEBUG, "Tag/Value = %x %x \n",
> bytestream2_get_be16(&gb), bytestream2_get_be16(&gb));
the order of evaluation is undefined
patch should be fine
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Into a blind darkness they enter who follow after the Ignorance,
they as if into a greater darkness enter who devote themselves
to the Knowledge alone. -- Isha Upanishad
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