On Sun, Jul 8, 2012 at 9:42 PM, Kostya Shishkov <kostya.shish...@gmail.com> wrote: > On Sun, Jul 08, 2012 at 08:17:10PM -0700, Jason Garrett-Glaser wrote: >> > +#define UNQUANT(val, q) ((q * val + 0x80) >> 8) >> >> I'd call this DEQUANT, but that's just me. > > I don't have preferences here, so why not. > >> > + for (i = 0; i < 4; i++) { >> > + if (i & 1) { >> > + t0 = UNQUANT(q[1], in[0 * 4 + i]); >> > + t1 = UNQUANT(q[2], in[1 * 4 + i]); >> > + t2 = UNQUANT(q[1], in[2 * 4 + i]); >> > + t3 = UNQUANT(q[2], in[3 * 4 + i]); >> > + } else { >> > + t0 = UNQUANT(q[0], in[0 * 4 + i]); >> > + t1 = UNQUANT(q[1], in[1 * 4 + i]); >> > + t2 = UNQUANT(q[0], in[2 * 4 + i]); >> > + t3 = UNQUANT(q[1], in[3 * 4 + i]); >> > + } >> >> Branchless please? Maybe q[0+(i&1)] or such? > > Done. > >> > +static const uint8_t tscc2_zigzag[16] = { >> > + 0, 1, 4, 8, >> > + 5, 2, 3, 6, >> > + 9, 12, 13, 10, >> > + 7, 11, 14, 15 >> > +// 0, 4, 1, 2, >> > +// 5, 8, 12, 9, >> > +// 6, 3, 7, 10, >> > +// 13, 14, 11, 15 >> > +}; >> >> Use an existing one if possible? > > We have several standard ones but they are all 8x8.
H.264's is 4x4 and I think it matches that? Jason _______________________________________________ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel