MythTV: vc1dsp_altivec.c Source File

00001 /*
00002  * VC-1 and WMV3 decoder - DSP functions AltiVec-optimized
00003  * Copyright (c) 2006 Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "dsputil.h"
00023 
00024 #include "gcc_fixes.h"
00025 
00026 #include "util_altivec.h"
00027 
00028 // main steps of 8x8 transform
00029 #define STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_rnd) \
00030 do { \
00031     t0 = vec_sl(vec_add(s0, s4), vec_2); \
00032     t0 = vec_add(vec_sl(t0, vec_1), t0); \
00033     t0 = vec_add(t0, vec_rnd); \
00034     t1 = vec_sl(vec_sub(s0, s4), vec_2); \
00035     t1 = vec_add(vec_sl(t1, vec_1), t1); \
00036     t1 = vec_add(t1, vec_rnd); \
00037     t2 = vec_add(vec_sl(s6, vec_2), vec_sl(s6, vec_1)); \
00038     t2 = vec_add(t2, vec_sl(s2, vec_4)); \
00039     t3 = vec_add(vec_sl(s2, vec_2), vec_sl(s2, vec_1)); \
00040     t3 = vec_sub(t3, vec_sl(s6, vec_4)); \
00041     t4 = vec_add(t0, t2); \
00042     t5 = vec_add(t1, t3); \
00043     t6 = vec_sub(t1, t3); \
00044     t7 = vec_sub(t0, t2); \
00045 \
00046     t0 = vec_sl(vec_add(s1, s3), vec_4); \
00047     t0 = vec_add(t0, vec_sl(s5, vec_3)); \
00048     t0 = vec_add(t0, vec_sl(s7, vec_2)); \
00049     t0 = vec_add(t0, vec_sub(s5, s3)); \
00050 \
00051     t1 = vec_sl(vec_sub(s1, s5), vec_4); \
00052     t1 = vec_sub(t1, vec_sl(s7, vec_3)); \
00053     t1 = vec_sub(t1, vec_sl(s3, vec_2)); \
00054     t1 = vec_sub(t1, vec_add(s1, s7)); \
00055 \
00056     t2 = vec_sl(vec_sub(s7, s3), vec_4); \
00057     t2 = vec_add(t2, vec_sl(s1, vec_3)); \
00058     t2 = vec_add(t2, vec_sl(s5, vec_2)); \
00059     t2 = vec_add(t2, vec_sub(s1, s7)); \
00060 \
00061     t3 = vec_sl(vec_sub(s5, s7), vec_4); \
00062     t3 = vec_sub(t3, vec_sl(s3, vec_3)); \
00063     t3 = vec_add(t3, vec_sl(s1, vec_2)); \
00064     t3 = vec_sub(t3, vec_add(s3, s5)); \
00065 \
00066     s0 = vec_add(t4, t0); \
00067     s1 = vec_add(t5, t1); \
00068     s2 = vec_add(t6, t2); \
00069     s3 = vec_add(t7, t3); \
00070     s4 = vec_sub(t7, t3); \
00071     s5 = vec_sub(t6, t2); \
00072     s6 = vec_sub(t5, t1); \
00073     s7 = vec_sub(t4, t0); \
00074 }while(0)
00075 
00076 #define SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7) \
00077 do { \
00078     s0 = vec_sra(s0, vec_3); \
00079     s1 = vec_sra(s1, vec_3); \
00080     s2 = vec_sra(s2, vec_3); \
00081     s3 = vec_sra(s3, vec_3); \
00082     s4 = vec_sra(s4, vec_3); \
00083     s5 = vec_sra(s5, vec_3); \
00084     s6 = vec_sra(s6, vec_3); \
00085     s7 = vec_sra(s7, vec_3); \
00086 }while(0)
00087 
00088 #define SHIFT_VERT8(s0, s1, s2, s3, s4, s5, s6, s7) \
00089 do { \
00090     s0 = vec_sra(s0, vec_7); \
00091     s1 = vec_sra(s1, vec_7); \
00092     s2 = vec_sra(s2, vec_7); \
00093     s3 = vec_sra(s3, vec_7); \
00094     s4 = vec_sra(vec_add(s4, vec_1s), vec_7); \
00095     s5 = vec_sra(vec_add(s5, vec_1s), vec_7); \
00096     s6 = vec_sra(vec_add(s6, vec_1s), vec_7); \
00097     s7 = vec_sra(vec_add(s7, vec_1s), vec_7); \
00098 }while(0)
00099 
00100 /* main steps of 4x4 transform */
00101 #define STEP4(s0, s1, s2, s3, vec_rnd) \
00102 do { \
00103     t1 = vec_add(vec_sl(s0, vec_4), s0); \
00104     t1 = vec_add(t1, vec_rnd); \
00105     t2 = vec_add(vec_sl(s2, vec_4), s2); \
00106     t0 = vec_add(t1, t2); \
00107     t1 = vec_sub(t1, t2); \
00108     t3 = vec_sl(vec_sub(s3, s1), vec_1); \
00109     t3 = vec_add(t3, vec_sl(t3, vec_2)); \
00110     t2 = vec_add(t3, vec_sl(s1, vec_5)); \
00111     t3 = vec_add(t3, vec_sl(s3, vec_3)); \
00112     t3 = vec_add(t3, vec_sl(s3, vec_2)); \
00113     s0 = vec_add(t0, t2); \
00114     s1 = vec_sub(t1, t3); \
00115     s2 = vec_add(t1, t3); \
00116     s3 = vec_sub(t0, t2); \
00117 }while (0)
00118 
00119 #define SHIFT_HOR4(s0, s1, s2, s3) \
00120     s0 = vec_sra(s0, vec_3); \
00121     s1 = vec_sra(s1, vec_3); \
00122     s2 = vec_sra(s2, vec_3); \
00123     s3 = vec_sra(s3, vec_3);
00124 
00125 #define SHIFT_VERT4(s0, s1, s2, s3) \
00126     s0 = vec_sra(s0, vec_7); \
00127     s1 = vec_sra(s1, vec_7); \
00128     s2 = vec_sra(s2, vec_7); \
00129     s3 = vec_sra(s3, vec_7);
00130 
00133 static void vc1_inv_trans_8x8_altivec(DCTELEM block[64])
00134 {
00135     vector signed short src0, src1, src2, src3, src4, src5, src6, src7;
00136     vector signed int s0, s1, s2, s3, s4, s5, s6, s7;
00137     vector signed int s8, s9, sA, sB, sC, sD, sE, sF;
00138     vector signed int t0, t1, t2, t3, t4, t5, t6, t7;
00139     const vector signed int vec_64 = vec_sl(vec_splat_s32(4), vec_splat_u32(4));
00140     const vector unsigned int vec_7 = vec_splat_u32(7);
00141     const vector unsigned int vec_4 = vec_splat_u32(4);
00142     const vector  signed int vec_4s = vec_splat_s32(4);
00143     const vector unsigned int vec_3 = vec_splat_u32(3);
00144     const vector unsigned int vec_2 = vec_splat_u32(2);
00145     const vector  signed int vec_1s = vec_splat_s32(1);
00146     const vector unsigned int vec_1 = vec_splat_u32(1);
00147 
00148 
00149     src0 = vec_ld(  0, block);
00150     src1 = vec_ld( 16, block);
00151     src2 = vec_ld( 32, block);
00152     src3 = vec_ld( 48, block);
00153     src4 = vec_ld( 64, block);
00154     src5 = vec_ld( 80, block);
00155     src6 = vec_ld( 96, block);
00156     src7 = vec_ld(112, block);
00157 
00158     TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
00159     s0 = vec_unpackl(src0);
00160     s1 = vec_unpackl(src1);
00161     s2 = vec_unpackl(src2);
00162     s3 = vec_unpackl(src3);
00163     s4 = vec_unpackl(src4);
00164     s5 = vec_unpackl(src5);
00165     s6 = vec_unpackl(src6);
00166     s7 = vec_unpackl(src7);
00167     s8 = vec_unpackh(src0);
00168     s9 = vec_unpackh(src1);
00169     sA = vec_unpackh(src2);
00170     sB = vec_unpackh(src3);
00171     sC = vec_unpackh(src4);
00172     sD = vec_unpackh(src5);
00173     sE = vec_unpackh(src6);
00174     sF = vec_unpackh(src7);
00175     STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_4s);
00176     SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7);
00177     STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_4s);
00178     SHIFT_HOR8(s8, s9, sA, sB, sC, sD, sE, sF);
00179     src0 = vec_pack(s8, s0);
00180     src1 = vec_pack(s9, s1);
00181     src2 = vec_pack(sA, s2);
00182     src3 = vec_pack(sB, s3);
00183     src4 = vec_pack(sC, s4);
00184     src5 = vec_pack(sD, s5);
00185     src6 = vec_pack(sE, s6);
00186     src7 = vec_pack(sF, s7);
00187     TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
00188 
00189     s0 = vec_unpackl(src0);
00190     s1 = vec_unpackl(src1);
00191     s2 = vec_unpackl(src2);
00192     s3 = vec_unpackl(src3);
00193     s4 = vec_unpackl(src4);
00194     s5 = vec_unpackl(src5);
00195     s6 = vec_unpackl(src6);
00196     s7 = vec_unpackl(src7);
00197     s8 = vec_unpackh(src0);
00198     s9 = vec_unpackh(src1);
00199     sA = vec_unpackh(src2);
00200     sB = vec_unpackh(src3);
00201     sC = vec_unpackh(src4);
00202     sD = vec_unpackh(src5);
00203     sE = vec_unpackh(src6);
00204     sF = vec_unpackh(src7);
00205     STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_64);
00206     SHIFT_VERT8(s0, s1, s2, s3, s4, s5, s6, s7);
00207     STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_64);
00208     SHIFT_VERT8(s8, s9, sA, sB, sC, sD, sE, sF);
00209     src0 = vec_pack(s8, s0);
00210     src1 = vec_pack(s9, s1);
00211     src2 = vec_pack(sA, s2);
00212     src3 = vec_pack(sB, s3);
00213     src4 = vec_pack(sC, s4);
00214     src5 = vec_pack(sD, s5);
00215     src6 = vec_pack(sE, s6);
00216     src7 = vec_pack(sF, s7);
00217 
00218     vec_st(src0,  0, block);
00219     vec_st(src1, 16, block);
00220     vec_st(src2, 32, block);
00221     vec_st(src3, 48, block);
00222     vec_st(src4, 64, block);
00223     vec_st(src5, 80, block);
00224     vec_st(src6, 96, block);
00225     vec_st(src7,112, block);
00226 }
00227 
00230 static void vc1_inv_trans_8x4_altivec(DCTELEM block[64], int n)
00231 {
00232     vector signed short src0, src1, src2, src3, src4, src5, src6, src7;
00233     vector signed int s0, s1, s2, s3, s4, s5, s6, s7;
00234     vector signed int s8, s9, sA, sB, sC, sD, sE, sF;
00235     vector signed int t0, t1, t2, t3, t4, t5, t6, t7;
00236     const vector signed int vec_64 = vec_sl(vec_splat_s32(4), vec_splat_u32(4));
00237     const vector unsigned int vec_7 = vec_splat_u32(7);
00238     const vector unsigned int vec_5 = vec_splat_u32(5);
00239     const vector unsigned int vec_4 = vec_splat_u32(4);
00240     const vector  signed int vec_4s = vec_splat_s32(4);
00241     const vector unsigned int vec_3 = vec_splat_u32(3);
00242     const vector unsigned int vec_2 = vec_splat_u32(2);
00243     const vector unsigned int vec_1 = vec_splat_u32(1);
00244 
00245     src0 = vec_ld(  0, block);
00246     src1 = vec_ld( 16, block);
00247     src2 = vec_ld( 32, block);
00248     src3 = vec_ld( 48, block);
00249     src4 = vec_ld( 64, block);
00250     src5 = vec_ld( 80, block);
00251     src6 = vec_ld( 96, block);
00252     src7 = vec_ld(112, block);
00253 
00254     TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
00255     s0 = vec_unpackl(src0);
00256     s1 = vec_unpackl(src1);
00257     s2 = vec_unpackl(src2);
00258     s3 = vec_unpackl(src3);
00259     s4 = vec_unpackl(src4);
00260     s5 = vec_unpackl(src5);
00261     s6 = vec_unpackl(src6);
00262     s7 = vec_unpackl(src7);
00263     s8 = vec_unpackh(src0);
00264     s9 = vec_unpackh(src1);
00265     sA = vec_unpackh(src2);
00266     sB = vec_unpackh(src3);
00267     sC = vec_unpackh(src4);
00268     sD = vec_unpackh(src5);
00269     sE = vec_unpackh(src6);
00270     sF = vec_unpackh(src7);
00271     STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_4s);
00272     SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7);
00273     STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_4s);
00274     SHIFT_HOR8(s8, s9, sA, sB, sC, sD, sE, sF);
00275     src0 = vec_pack(s8, s0);
00276     src1 = vec_pack(s9, s1);
00277     src2 = vec_pack(sA, s2);
00278     src3 = vec_pack(sB, s3);
00279     src4 = vec_pack(sC, s4);
00280     src5 = vec_pack(sD, s5);
00281     src6 = vec_pack(sE, s6);
00282     src7 = vec_pack(sF, s7);
00283     TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
00284 
00285     if(!n){ // upper half of block
00286         s0 = vec_unpackh(src0);
00287         s1 = vec_unpackh(src1);
00288         s2 = vec_unpackh(src2);
00289         s3 = vec_unpackh(src3);
00290         s8 = vec_unpackl(src0);
00291         s9 = vec_unpackl(src1);
00292         sA = vec_unpackl(src2);
00293         sB = vec_unpackl(src3);
00294         STEP4(s0, s1, s2, s3, vec_64);
00295         SHIFT_VERT4(s0, s1, s2, s3);
00296         STEP4(s8, s9, sA, sB, vec_64);
00297         SHIFT_VERT4(s8, s9, sA, sB);
00298         src0 = vec_pack(s0, s8);
00299         src1 = vec_pack(s1, s9);
00300         src2 = vec_pack(s2, sA);
00301         src3 = vec_pack(s3, sB);
00302 
00303         vec_st(src0,  0, block);
00304         vec_st(src1, 16, block);
00305         vec_st(src2, 32, block);
00306         vec_st(src3, 48, block);
00307     } else { //lower half of block
00308         s0 = vec_unpackh(src4);
00309         s1 = vec_unpackh(src5);
00310         s2 = vec_unpackh(src6);
00311         s3 = vec_unpackh(src7);
00312         s8 = vec_unpackl(src4);
00313         s9 = vec_unpackl(src5);
00314         sA = vec_unpackl(src6);
00315         sB = vec_unpackl(src7);
00316         STEP4(s0, s1, s2, s3, vec_64);
00317         SHIFT_VERT4(s0, s1, s2, s3);
00318         STEP4(s8, s9, sA, sB, vec_64);
00319         SHIFT_VERT4(s8, s9, sA, sB);
00320         src4 = vec_pack(s0, s8);
00321         src5 = vec_pack(s1, s9);
00322         src6 = vec_pack(s2, sA);
00323         src7 = vec_pack(s3, sB);
00324 
00325         vec_st(src4, 64, block);
00326         vec_st(src5, 80, block);
00327         vec_st(src6, 96, block);
00328         vec_st(src7,112, block);
00329     }
00330 }
00331 
00332 
00333 void vc1dsp_init_altivec(DSPContext* dsp, AVCodecContext *avctx) {
00334     dsp->vc1_inv_trans_8x8 = vc1_inv_trans_8x8_altivec;
00335     dsp->vc1_inv_trans_8x4 = vc1_inv_trans_8x4_altivec;
00336 }