563 lines
14 KiB
C
563 lines
14 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************
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function:
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last mod: $Id: mmxidct.c 16503 2009-08-22 18:14:02Z giles $
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********************************************************************/
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/*MMX acceleration of Theora's iDCT.
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Originally written by Rudolf Marek, based on code from On2's VP3.*/
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#include "x86int.h"
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#include "../dct.h"
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#if defined(OC_X86_ASM)
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/*These are offsets into the table of constants below.*/
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/*7 rows of cosines, in order: pi/16 * (1 ... 7).*/
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#define OC_COSINE_OFFSET (0)
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/*A row of 8's.*/
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#define OC_EIGHT_OFFSET (56)
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/*A table of constants used by the MMX routines.*/
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static const __declspec(align(16))ogg_uint16_t
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OC_IDCT_CONSTS[(7+1)*4]={
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(ogg_uint16_t)OC_C1S7,(ogg_uint16_t)OC_C1S7,
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(ogg_uint16_t)OC_C1S7,(ogg_uint16_t)OC_C1S7,
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(ogg_uint16_t)OC_C2S6,(ogg_uint16_t)OC_C2S6,
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(ogg_uint16_t)OC_C2S6,(ogg_uint16_t)OC_C2S6,
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(ogg_uint16_t)OC_C3S5,(ogg_uint16_t)OC_C3S5,
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(ogg_uint16_t)OC_C3S5,(ogg_uint16_t)OC_C3S5,
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(ogg_uint16_t)OC_C4S4,(ogg_uint16_t)OC_C4S4,
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(ogg_uint16_t)OC_C4S4,(ogg_uint16_t)OC_C4S4,
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(ogg_uint16_t)OC_C5S3,(ogg_uint16_t)OC_C5S3,
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(ogg_uint16_t)OC_C5S3,(ogg_uint16_t)OC_C5S3,
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(ogg_uint16_t)OC_C6S2,(ogg_uint16_t)OC_C6S2,
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(ogg_uint16_t)OC_C6S2,(ogg_uint16_t)OC_C6S2,
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(ogg_uint16_t)OC_C7S1,(ogg_uint16_t)OC_C7S1,
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(ogg_uint16_t)OC_C7S1,(ogg_uint16_t)OC_C7S1,
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8, 8, 8, 8
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};
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/*38 cycles*/
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#define OC_IDCT_BEGIN __asm{ \
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__asm movq mm2,OC_I(3) \
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__asm movq mm6,OC_C(3) \
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__asm movq mm4,mm2 \
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__asm movq mm7,OC_J(5) \
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__asm pmulhw mm4,mm6 \
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__asm movq mm1,OC_C(5) \
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__asm pmulhw mm6,mm7 \
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__asm movq mm5,mm1 \
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__asm pmulhw mm1,mm2 \
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__asm movq mm3,OC_I(1) \
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__asm pmulhw mm5,mm7 \
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__asm movq mm0,OC_C(1) \
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__asm paddw mm4,mm2 \
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__asm paddw mm6,mm7 \
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__asm paddw mm2,mm1 \
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__asm movq mm1,OC_J(7) \
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__asm paddw mm7,mm5 \
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__asm movq mm5,mm0 \
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__asm pmulhw mm0,mm3 \
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__asm paddw mm4,mm7 \
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__asm pmulhw mm5,mm1 \
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__asm movq mm7,OC_C(7) \
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__asm psubw mm6,mm2 \
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__asm paddw mm0,mm3 \
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__asm pmulhw mm3,mm7 \
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__asm movq mm2,OC_I(2) \
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__asm pmulhw mm7,mm1 \
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__asm paddw mm5,mm1 \
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__asm movq mm1,mm2 \
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__asm pmulhw mm2,OC_C(2) \
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__asm psubw mm3,mm5 \
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__asm movq mm5,OC_J(6) \
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__asm paddw mm0,mm7 \
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__asm movq mm7,mm5 \
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__asm psubw mm0,mm4 \
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__asm pmulhw mm5,OC_C(2) \
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__asm paddw mm2,mm1 \
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__asm pmulhw mm1,OC_C(6) \
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__asm paddw mm4,mm4 \
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__asm paddw mm4,mm0 \
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__asm psubw mm3,mm6 \
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__asm paddw mm5,mm7 \
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__asm paddw mm6,mm6 \
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__asm pmulhw mm7,OC_C(6) \
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__asm paddw mm6,mm3 \
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__asm movq OC_I(1),mm4 \
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__asm psubw mm1,mm5 \
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__asm movq mm4,OC_C(4) \
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__asm movq mm5,mm3 \
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__asm pmulhw mm3,mm4 \
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__asm paddw mm7,mm2 \
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__asm movq OC_I(2),mm6 \
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__asm movq mm2,mm0 \
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__asm movq mm6,OC_I(0) \
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__asm pmulhw mm0,mm4 \
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__asm paddw mm5,mm3 \
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__asm movq mm3,OC_J(4) \
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__asm psubw mm5,mm1 \
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__asm paddw mm2,mm0 \
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__asm psubw mm6,mm3 \
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__asm movq mm0,mm6 \
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__asm pmulhw mm6,mm4 \
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__asm paddw mm3,mm3 \
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__asm paddw mm1,mm1 \
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__asm paddw mm3,mm0 \
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__asm paddw mm1,mm5 \
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__asm pmulhw mm4,mm3 \
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__asm paddw mm6,mm0 \
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__asm psubw mm6,mm2 \
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__asm paddw mm2,mm2 \
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__asm movq mm0,OC_I(1) \
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__asm paddw mm2,mm6 \
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__asm paddw mm4,mm3 \
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__asm psubw mm2,mm1 \
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}
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/*38+8=46 cycles.*/
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#define OC_ROW_IDCT __asm{ \
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OC_IDCT_BEGIN \
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/*r3=D'*/ \
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__asm movq mm3,OC_I(2) \
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/*r4=E'=E-G*/ \
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__asm psubw mm4,mm7 \
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/*r1=H'+H'*/ \
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__asm paddw mm1,mm1 \
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/*r7=G+G*/ \
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__asm paddw mm7,mm7 \
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/*r1=R1=A''+H'*/ \
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__asm paddw mm1,mm2 \
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/*r7=G'=E+G*/ \
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__asm paddw mm7,mm4 \
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/*r4=R4=E'-D'*/ \
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__asm psubw mm4,mm3 \
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__asm paddw mm3,mm3 \
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/*r6=R6=F'-B''*/ \
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__asm psubw mm6,mm5 \
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__asm paddw mm5,mm5 \
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/*r3=R3=E'+D'*/ \
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__asm paddw mm3,mm4 \
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/*r5=R5=F'+B''*/ \
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__asm paddw mm5,mm6 \
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/*r7=R7=G'-C'*/ \
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__asm psubw mm7,mm0 \
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__asm paddw mm0,mm0 \
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/*Save R1.*/ \
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__asm movq OC_I(1),mm1 \
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/*r0=R0=G.+C.*/ \
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__asm paddw mm0,mm7 \
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}
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/*The following macro does two 4x4 transposes in place.
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At entry, we assume:
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r0 = a3 a2 a1 a0
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I(1) = b3 b2 b1 b0
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r2 = c3 c2 c1 c0
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r3 = d3 d2 d1 d0
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r4 = e3 e2 e1 e0
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r5 = f3 f2 f1 f0
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r6 = g3 g2 g1 g0
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r7 = h3 h2 h1 h0
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At exit, we have:
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I(0) = d0 c0 b0 a0
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I(1) = d1 c1 b1 a1
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I(2) = d2 c2 b2 a2
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I(3) = d3 c3 b3 a3
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J(4) = h0 g0 f0 e0
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J(5) = h1 g1 f1 e1
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J(6) = h2 g2 f2 e2
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J(7) = h3 g3 f3 e3
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I(0) I(1) I(2) I(3) is the transpose of r0 I(1) r2 r3.
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J(4) J(5) J(6) J(7) is the transpose of r4 r5 r6 r7.
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Since r1 is free at entry, we calculate the Js first.*/
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/*19 cycles.*/
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#define OC_TRANSPOSE __asm{ \
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__asm movq mm1,mm4 \
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__asm punpcklwd mm4,mm5 \
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__asm movq OC_I(0),mm0 \
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__asm punpckhwd mm1,mm5 \
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__asm movq mm0,mm6 \
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__asm punpcklwd mm6,mm7 \
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__asm movq mm5,mm4 \
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__asm punpckldq mm4,mm6 \
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__asm punpckhdq mm5,mm6 \
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__asm movq mm6,mm1 \
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__asm movq OC_J(4),mm4 \
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__asm punpckhwd mm0,mm7 \
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__asm movq OC_J(5),mm5 \
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__asm punpckhdq mm6,mm0 \
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__asm movq mm4,OC_I(0) \
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__asm punpckldq mm1,mm0 \
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__asm movq mm5,OC_I(1) \
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__asm movq mm0,mm4 \
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__asm movq OC_J(7),mm6 \
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__asm punpcklwd mm0,mm5 \
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__asm movq OC_J(6),mm1 \
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__asm punpckhwd mm4,mm5 \
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__asm movq mm5,mm2 \
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__asm punpcklwd mm2,mm3 \
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__asm movq mm1,mm0 \
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__asm punpckldq mm0,mm2 \
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__asm punpckhdq mm1,mm2 \
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__asm movq mm2,mm4 \
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__asm movq OC_I(0),mm0 \
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__asm punpckhwd mm5,mm3 \
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__asm movq OC_I(1),mm1 \
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__asm punpckhdq mm4,mm5 \
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__asm punpckldq mm2,mm5 \
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__asm movq OC_I(3),mm4 \
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__asm movq OC_I(2),mm2 \
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}
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/*38+19=57 cycles.*/
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#define OC_COLUMN_IDCT __asm{ \
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OC_IDCT_BEGIN \
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__asm paddw mm2,OC_8 \
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/*r1=H'+H'*/ \
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__asm paddw mm1,mm1 \
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/*r1=R1=A''+H'*/ \
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__asm paddw mm1,mm2 \
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/*r2=NR2*/ \
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__asm psraw mm2,4 \
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/*r4=E'=E-G*/ \
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__asm psubw mm4,mm7 \
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/*r1=NR1*/ \
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__asm psraw mm1,4 \
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/*r3=D'*/ \
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__asm movq mm3,OC_I(2) \
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/*r7=G+G*/ \
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__asm paddw mm7,mm7 \
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/*Store NR2 at I(2).*/ \
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__asm movq OC_I(2),mm2 \
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/*r7=G'=E+G*/ \
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__asm paddw mm7,mm4 \
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/*Store NR1 at I(1).*/ \
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__asm movq OC_I(1),mm1 \
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/*r4=R4=E'-D'*/ \
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__asm psubw mm4,mm3 \
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__asm paddw mm4,OC_8 \
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/*r3=D'+D'*/ \
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__asm paddw mm3,mm3 \
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/*r3=R3=E'+D'*/ \
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__asm paddw mm3,mm4 \
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/*r4=NR4*/ \
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__asm psraw mm4,4 \
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/*r6=R6=F'-B''*/ \
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__asm psubw mm6,mm5 \
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/*r3=NR3*/ \
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__asm psraw mm3,4 \
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__asm paddw mm6,OC_8 \
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/*r5=B''+B''*/ \
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__asm paddw mm5,mm5 \
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/*r5=R5=F'+B''*/ \
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__asm paddw mm5,mm6 \
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/*r6=NR6*/ \
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__asm psraw mm6,4 \
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/*Store NR4 at J(4).*/ \
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__asm movq OC_J(4),mm4 \
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/*r5=NR5*/ \
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__asm psraw mm5,4 \
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/*Store NR3 at I(3).*/ \
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__asm movq OC_I(3),mm3 \
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/*r7=R7=G'-C'*/ \
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__asm psubw mm7,mm0 \
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__asm paddw mm7,OC_8 \
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/*r0=C'+C'*/ \
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__asm paddw mm0,mm0 \
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/*r0=R0=G'+C'*/ \
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__asm paddw mm0,mm7 \
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/*r7=NR7*/ \
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__asm psraw mm7,4 \
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/*Store NR6 at J(6).*/ \
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__asm movq OC_J(6),mm6 \
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/*r0=NR0*/ \
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__asm psraw mm0,4 \
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/*Store NR5 at J(5).*/ \
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__asm movq OC_J(5),mm5 \
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/*Store NR7 at J(7).*/ \
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__asm movq OC_J(7),mm7 \
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/*Store NR0 at I(0).*/ \
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__asm movq OC_I(0),mm0 \
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}
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#define OC_MID(_m,_i) [CONSTS+_m+(_i)*8]
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#define OC_C(_i) OC_MID(OC_COSINE_OFFSET,_i-1)
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#define OC_8 OC_MID(OC_EIGHT_OFFSET,0)
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static void oc_idct8x8_slow(ogg_int16_t _y[64]){
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/*This routine accepts an 8x8 matrix, but in partially transposed form.
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Every 4x4 block is transposed.*/
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__asm{
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#define CONSTS eax
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#define Y edx
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mov CONSTS,offset OC_IDCT_CONSTS
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mov Y,_y
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#define OC_I(_k) [Y+_k*16]
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#define OC_J(_k) [Y+(_k-4)*16+8]
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OC_ROW_IDCT
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OC_TRANSPOSE
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#undef OC_I
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#undef OC_J
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#define OC_I(_k) [Y+(_k*16)+64]
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#define OC_J(_k) [Y+(_k-4)*16+72]
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OC_ROW_IDCT
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OC_TRANSPOSE
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|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#define OC_I(_k) [Y+_k*16]
|
||
|
|
#define OC_J(_k) OC_I(_k)
|
||
|
|
OC_COLUMN_IDCT
|
||
|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#define OC_I(_k) [Y+_k*16+8]
|
||
|
|
#define OC_J(_k) OC_I(_k)
|
||
|
|
OC_COLUMN_IDCT
|
||
|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#undef CONSTS
|
||
|
|
#undef Y
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*25 cycles.*/
|
||
|
|
#define OC_IDCT_BEGIN_10 __asm{ \
|
||
|
|
__asm movq mm2,OC_I(3) \
|
||
|
|
__asm nop \
|
||
|
|
__asm movq mm6,OC_C(3) \
|
||
|
|
__asm movq mm4,mm2 \
|
||
|
|
__asm movq mm1,OC_C(5) \
|
||
|
|
__asm pmulhw mm4,mm6 \
|
||
|
|
__asm movq mm3,OC_I(1) \
|
||
|
|
__asm pmulhw mm1,mm2 \
|
||
|
|
__asm movq mm0,OC_C(1) \
|
||
|
|
__asm paddw mm4,mm2 \
|
||
|
|
__asm pxor mm6,mm6 \
|
||
|
|
__asm paddw mm2,mm1 \
|
||
|
|
__asm movq mm5,OC_I(2) \
|
||
|
|
__asm pmulhw mm0,mm3 \
|
||
|
|
__asm movq mm1,mm5 \
|
||
|
|
__asm paddw mm0,mm3 \
|
||
|
|
__asm pmulhw mm3,OC_C(7) \
|
||
|
|
__asm psubw mm6,mm2 \
|
||
|
|
__asm pmulhw mm5,OC_C(2) \
|
||
|
|
__asm psubw mm0,mm4 \
|
||
|
|
__asm movq mm7,OC_I(2) \
|
||
|
|
__asm paddw mm4,mm4 \
|
||
|
|
__asm paddw mm7,mm5 \
|
||
|
|
__asm paddw mm4,mm0 \
|
||
|
|
__asm pmulhw mm1,OC_C(6) \
|
||
|
|
__asm psubw mm3,mm6 \
|
||
|
|
__asm movq OC_I(1),mm4 \
|
||
|
|
__asm paddw mm6,mm6 \
|
||
|
|
__asm movq mm4,OC_C(4) \
|
||
|
|
__asm paddw mm6,mm3 \
|
||
|
|
__asm movq mm5,mm3 \
|
||
|
|
__asm pmulhw mm3,mm4 \
|
||
|
|
__asm movq OC_I(2),mm6 \
|
||
|
|
__asm movq mm2,mm0 \
|
||
|
|
__asm movq mm6,OC_I(0) \
|
||
|
|
__asm pmulhw mm0,mm4 \
|
||
|
|
__asm paddw mm5,mm3 \
|
||
|
|
__asm paddw mm2,mm0 \
|
||
|
|
__asm psubw mm5,mm1 \
|
||
|
|
__asm pmulhw mm6,mm4 \
|
||
|
|
__asm paddw mm6,OC_I(0) \
|
||
|
|
__asm paddw mm1,mm1 \
|
||
|
|
__asm movq mm4,mm6 \
|
||
|
|
__asm paddw mm1,mm5 \
|
||
|
|
__asm psubw mm6,mm2 \
|
||
|
|
__asm paddw mm2,mm2 \
|
||
|
|
__asm movq mm0,OC_I(1) \
|
||
|
|
__asm paddw mm2,mm6 \
|
||
|
|
__asm psubw mm2,mm1 \
|
||
|
|
__asm nop \
|
||
|
|
}
|
||
|
|
|
||
|
|
/*25+8=33 cycles.*/
|
||
|
|
#define OC_ROW_IDCT_10 __asm{ \
|
||
|
|
OC_IDCT_BEGIN_10 \
|
||
|
|
/*r3=D'*/ \
|
||
|
|
__asm movq mm3,OC_I(2) \
|
||
|
|
/*r4=E'=E-G*/ \
|
||
|
|
__asm psubw mm4,mm7 \
|
||
|
|
/*r1=H'+H'*/ \
|
||
|
|
__asm paddw mm1,mm1 \
|
||
|
|
/*r7=G+G*/ \
|
||
|
|
__asm paddw mm7,mm7 \
|
||
|
|
/*r1=R1=A''+H'*/ \
|
||
|
|
__asm paddw mm1,mm2 \
|
||
|
|
/*r7=G'=E+G*/ \
|
||
|
|
__asm paddw mm7,mm4 \
|
||
|
|
/*r4=R4=E'-D'*/ \
|
||
|
|
__asm psubw mm4,mm3 \
|
||
|
|
__asm paddw mm3,mm3 \
|
||
|
|
/*r6=R6=F'-B''*/ \
|
||
|
|
__asm psubw mm6,mm5 \
|
||
|
|
__asm paddw mm5,mm5 \
|
||
|
|
/*r3=R3=E'+D'*/ \
|
||
|
|
__asm paddw mm3,mm4 \
|
||
|
|
/*r5=R5=F'+B''*/ \
|
||
|
|
__asm paddw mm5,mm6 \
|
||
|
|
/*r7=R7=G'-C'*/ \
|
||
|
|
__asm psubw mm7,mm0 \
|
||
|
|
__asm paddw mm0,mm0 \
|
||
|
|
/*Save R1.*/ \
|
||
|
|
__asm movq OC_I(1),mm1 \
|
||
|
|
/*r0=R0=G'+C'*/ \
|
||
|
|
__asm paddw mm0,mm7 \
|
||
|
|
}
|
||
|
|
|
||
|
|
/*25+19=44 cycles'*/
|
||
|
|
#define OC_COLUMN_IDCT_10 __asm{ \
|
||
|
|
OC_IDCT_BEGIN_10 \
|
||
|
|
__asm paddw mm2,OC_8 \
|
||
|
|
/*r1=H'+H'*/ \
|
||
|
|
__asm paddw mm1,mm1 \
|
||
|
|
/*r1=R1=A''+H'*/ \
|
||
|
|
__asm paddw mm1,mm2 \
|
||
|
|
/*r2=NR2*/ \
|
||
|
|
__asm psraw mm2,4 \
|
||
|
|
/*r4=E'=E-G*/ \
|
||
|
|
__asm psubw mm4,mm7 \
|
||
|
|
/*r1=NR1*/ \
|
||
|
|
__asm psraw mm1,4 \
|
||
|
|
/*r3=D'*/ \
|
||
|
|
__asm movq mm3,OC_I(2) \
|
||
|
|
/*r7=G+G*/ \
|
||
|
|
__asm paddw mm7,mm7 \
|
||
|
|
/*Store NR2 at I(2).*/ \
|
||
|
|
__asm movq OC_I(2),mm2 \
|
||
|
|
/*r7=G'=E+G*/ \
|
||
|
|
__asm paddw mm7,mm4 \
|
||
|
|
/*Store NR1 at I(1).*/ \
|
||
|
|
__asm movq OC_I(1),mm1 \
|
||
|
|
/*r4=R4=E'-D'*/ \
|
||
|
|
__asm psubw mm4,mm3 \
|
||
|
|
__asm paddw mm4,OC_8 \
|
||
|
|
/*r3=D'+D'*/ \
|
||
|
|
__asm paddw mm3,mm3 \
|
||
|
|
/*r3=R3=E'+D'*/ \
|
||
|
|
__asm paddw mm3,mm4 \
|
||
|
|
/*r4=NR4*/ \
|
||
|
|
__asm psraw mm4,4 \
|
||
|
|
/*r6=R6=F'-B''*/ \
|
||
|
|
__asm psubw mm6,mm5 \
|
||
|
|
/*r3=NR3*/ \
|
||
|
|
__asm psraw mm3,4 \
|
||
|
|
__asm paddw mm6,OC_8 \
|
||
|
|
/*r5=B''+B''*/ \
|
||
|
|
__asm paddw mm5,mm5 \
|
||
|
|
/*r5=R5=F'+B''*/ \
|
||
|
|
__asm paddw mm5,mm6 \
|
||
|
|
/*r6=NR6*/ \
|
||
|
|
__asm psraw mm6,4 \
|
||
|
|
/*Store NR4 at J(4).*/ \
|
||
|
|
__asm movq OC_J(4),mm4 \
|
||
|
|
/*r5=NR5*/ \
|
||
|
|
__asm psraw mm5,4 \
|
||
|
|
/*Store NR3 at I(3).*/ \
|
||
|
|
__asm movq OC_I(3),mm3 \
|
||
|
|
/*r7=R7=G'-C'*/ \
|
||
|
|
__asm psubw mm7,mm0 \
|
||
|
|
__asm paddw mm7,OC_8 \
|
||
|
|
/*r0=C'+C'*/ \
|
||
|
|
__asm paddw mm0,mm0 \
|
||
|
|
/*r0=R0=G'+C'*/ \
|
||
|
|
__asm paddw mm0,mm7 \
|
||
|
|
/*r7=NR7*/ \
|
||
|
|
__asm psraw mm7,4 \
|
||
|
|
/*Store NR6 at J(6).*/ \
|
||
|
|
__asm movq OC_J(6),mm6 \
|
||
|
|
/*r0=NR0*/ \
|
||
|
|
__asm psraw mm0,4 \
|
||
|
|
/*Store NR5 at J(5).*/ \
|
||
|
|
__asm movq OC_J(5),mm5 \
|
||
|
|
/*Store NR7 at J(7).*/ \
|
||
|
|
__asm movq OC_J(7),mm7 \
|
||
|
|
/*Store NR0 at I(0).*/ \
|
||
|
|
__asm movq OC_I(0),mm0 \
|
||
|
|
}
|
||
|
|
|
||
|
|
static void oc_idct8x8_10(ogg_int16_t _y[64]){
|
||
|
|
__asm{
|
||
|
|
#define CONSTS eax
|
||
|
|
#define Y edx
|
||
|
|
mov CONSTS,offset OC_IDCT_CONSTS
|
||
|
|
mov Y,_y
|
||
|
|
#define OC_I(_k) [Y+_k*16]
|
||
|
|
#define OC_J(_k) [Y+(_k-4)*16+8]
|
||
|
|
/*Done with dequant, descramble, and partial transpose.
|
||
|
|
Now do the iDCT itself.*/
|
||
|
|
OC_ROW_IDCT_10
|
||
|
|
OC_TRANSPOSE
|
||
|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#define OC_I(_k) [Y+_k*16]
|
||
|
|
#define OC_J(_k) OC_I(_k)
|
||
|
|
OC_COLUMN_IDCT_10
|
||
|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#define OC_I(_k) [Y+_k*16+8]
|
||
|
|
#define OC_J(_k) OC_I(_k)
|
||
|
|
OC_COLUMN_IDCT_10
|
||
|
|
#undef OC_I
|
||
|
|
#undef OC_J
|
||
|
|
#undef CONSTS
|
||
|
|
#undef Y
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*Performs an inverse 8x8 Type-II DCT transform.
|
||
|
|
The input is assumed to be scaled by a factor of 4 relative to orthonormal
|
||
|
|
version of the transform.*/
|
||
|
|
void oc_idct8x8_mmx(ogg_int16_t _y[64],int _last_zzi){
|
||
|
|
/*_last_zzi is subtly different from an actual count of the number of
|
||
|
|
coefficients we decoded for this block.
|
||
|
|
It contains the value of zzi BEFORE the final token in the block was
|
||
|
|
decoded.
|
||
|
|
In most cases this is an EOB token (the continuation of an EOB run from a
|
||
|
|
previous block counts), and so this is the same as the coefficient count.
|
||
|
|
However, in the case that the last token was NOT an EOB token, but filled
|
||
|
|
the block up with exactly 64 coefficients, _last_zzi will be less than 64.
|
||
|
|
Provided the last token was not a pure zero run, the minimum value it can
|
||
|
|
be is 46, and so that doesn't affect any of the cases in this routine.
|
||
|
|
However, if the last token WAS a pure zero run of length 63, then _last_zzi
|
||
|
|
will be 1 while the number of coefficients decoded is 64.
|
||
|
|
Thus, we will trigger the following special case, where the real
|
||
|
|
coefficient count would not.
|
||
|
|
Note also that a zero run of length 64 will give _last_zzi a value of 0,
|
||
|
|
but we still process the DC coefficient, which might have a non-zero value
|
||
|
|
due to DC prediction.
|
||
|
|
Although convoluted, this is arguably the correct behavior: it allows us to
|
||
|
|
use a smaller transform when the block ends with a long zero run instead
|
||
|
|
of a normal EOB token.
|
||
|
|
It could be smarter... multiple separate zero runs at the end of a block
|
||
|
|
will fool it, but an encoder that generates these really deserves what it
|
||
|
|
gets.
|
||
|
|
Needless to say we inherited this approach from VP3.*/
|
||
|
|
/*Perform the iDCT.*/
|
||
|
|
if(_last_zzi<10)oc_idct8x8_10(_y);
|
||
|
|
else oc_idct8x8_slow(_y);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|