• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • Examples
  • File List
  • Globals

libswscale/ppc/swscale_altivec.c

Go to the documentation of this file.
00001 /*
00002  * AltiVec-enhanced yuv2yuvX
00003  *
00004  * Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
00005  * based on the equivalent C code in swscale.c
00006  *
00007  * This file is part of FFmpeg.
00008  *
00009  * FFmpeg is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * FFmpeg is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with FFmpeg; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00022  */
00023 
00024 #include <inttypes.h>
00025 #include "config.h"
00026 #include "libswscale/swscale.h"
00027 #include "libswscale/swscale_internal.h"
00028 #include "libavutil/cpu.h"
00029 #include "yuv2rgb_altivec.h"
00030 
00031 #define vzero vec_splat_s32(0)
00032 
00033 static inline void
00034 altivec_packIntArrayToCharArray(int *val, uint8_t* dest, int dstW)
00035 {
00036     register int i;
00037     vector unsigned int altivec_vectorShiftInt19 =
00038         vec_add(vec_splat_u32(10), vec_splat_u32(9));
00039     if ((uintptr_t)dest % 16) {
00040         /* badly aligned store, we force store alignment */
00041         /* and will handle load misalignment on val w/ vec_perm */
00042         vector unsigned char perm1;
00043         vector signed int v1;
00044         for (i = 0 ; (i < dstW) &&
00045             (((uintptr_t)dest + i) % 16) ; i++) {
00046                 int t = val[i] >> 19;
00047                 dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
00048         }
00049         perm1 = vec_lvsl(i << 2, val);
00050         v1 = vec_ld(i << 2, val);
00051         for ( ; i < (dstW - 15); i+=16) {
00052             int offset = i << 2;
00053             vector signed int v2 = vec_ld(offset + 16, val);
00054             vector signed int v3 = vec_ld(offset + 32, val);
00055             vector signed int v4 = vec_ld(offset + 48, val);
00056             vector signed int v5 = vec_ld(offset + 64, val);
00057             vector signed int v12 = vec_perm(v1, v2, perm1);
00058             vector signed int v23 = vec_perm(v2, v3, perm1);
00059             vector signed int v34 = vec_perm(v3, v4, perm1);
00060             vector signed int v45 = vec_perm(v4, v5, perm1);
00061 
00062             vector signed int vA = vec_sra(v12, altivec_vectorShiftInt19);
00063             vector signed int vB = vec_sra(v23, altivec_vectorShiftInt19);
00064             vector signed int vC = vec_sra(v34, altivec_vectorShiftInt19);
00065             vector signed int vD = vec_sra(v45, altivec_vectorShiftInt19);
00066             vector unsigned short vs1 = vec_packsu(vA, vB);
00067             vector unsigned short vs2 = vec_packsu(vC, vD);
00068             vector unsigned char vf = vec_packsu(vs1, vs2);
00069             vec_st(vf, i, dest);
00070             v1 = v5;
00071         }
00072     } else { // dest is properly aligned, great
00073         for (i = 0; i < (dstW - 15); i+=16) {
00074             int offset = i << 2;
00075             vector signed int v1 = vec_ld(offset, val);
00076             vector signed int v2 = vec_ld(offset + 16, val);
00077             vector signed int v3 = vec_ld(offset + 32, val);
00078             vector signed int v4 = vec_ld(offset + 48, val);
00079             vector signed int v5 = vec_sra(v1, altivec_vectorShiftInt19);
00080             vector signed int v6 = vec_sra(v2, altivec_vectorShiftInt19);
00081             vector signed int v7 = vec_sra(v3, altivec_vectorShiftInt19);
00082             vector signed int v8 = vec_sra(v4, altivec_vectorShiftInt19);
00083             vector unsigned short vs1 = vec_packsu(v5, v6);
00084             vector unsigned short vs2 = vec_packsu(v7, v8);
00085             vector unsigned char vf = vec_packsu(vs1, vs2);
00086             vec_st(vf, i, dest);
00087         }
00088     }
00089     for ( ; i < dstW ; i++) {
00090         int t = val[i] >> 19;
00091         dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
00092     }
00093 }
00094 
00095 static void
00096 yuv2yuvX_altivec_real(SwsContext *c,
00097                       const int16_t *lumFilter, const int16_t **lumSrc,
00098                       int lumFilterSize, const int16_t *chrFilter,
00099                       const int16_t **chrUSrc, const int16_t **chrVSrc,
00100                       int chrFilterSize, const int16_t **alpSrc,
00101                       uint8_t *dest, uint8_t *uDest,
00102                       uint8_t *vDest, uint8_t *aDest,
00103                       int dstW, int chrDstW)
00104 {
00105     const vector signed int vini = {(1 << 18), (1 << 18), (1 << 18), (1 << 18)};
00106     register int i, j;
00107     {
00108         DECLARE_ALIGNED(16, int, val)[dstW];
00109 
00110         for (i = 0; i < (dstW -7); i+=4) {
00111             vec_st(vini, i << 2, val);
00112         }
00113         for (; i < dstW; i++) {
00114             val[i] = (1 << 18);
00115         }
00116 
00117         for (j = 0; j < lumFilterSize; j++) {
00118             vector signed short l1, vLumFilter = vec_ld(j << 1, lumFilter);
00119             vector unsigned char perm, perm0 = vec_lvsl(j << 1, lumFilter);
00120             vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
00121             vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter
00122 
00123             perm = vec_lvsl(0, lumSrc[j]);
00124             l1 = vec_ld(0, lumSrc[j]);
00125 
00126             for (i = 0; i < (dstW - 7); i+=8) {
00127                 int offset = i << 2;
00128                 vector signed short l2 = vec_ld((i << 1) + 16, lumSrc[j]);
00129 
00130                 vector signed int v1 = vec_ld(offset, val);
00131                 vector signed int v2 = vec_ld(offset + 16, val);
00132 
00133                 vector signed short ls = vec_perm(l1, l2, perm); // lumSrc[j][i] ... lumSrc[j][i+7]
00134 
00135                 vector signed int i1 = vec_mule(vLumFilter, ls);
00136                 vector signed int i2 = vec_mulo(vLumFilter, ls);
00137 
00138                 vector signed int vf1 = vec_mergeh(i1, i2);
00139                 vector signed int vf2 = vec_mergel(i1, i2); // lumSrc[j][i] * lumFilter[j] ... lumSrc[j][i+7] * lumFilter[j]
00140 
00141                 vector signed int vo1 = vec_add(v1, vf1);
00142                 vector signed int vo2 = vec_add(v2, vf2);
00143 
00144                 vec_st(vo1, offset, val);
00145                 vec_st(vo2, offset + 16, val);
00146 
00147                 l1 = l2;
00148             }
00149             for ( ; i < dstW; i++) {
00150                 val[i] += lumSrc[j][i] * lumFilter[j];
00151             }
00152         }
00153         altivec_packIntArrayToCharArray(val, dest, dstW);
00154     }
00155     if (uDest != 0) {
00156         DECLARE_ALIGNED(16, int, u)[chrDstW];
00157         DECLARE_ALIGNED(16, int, v)[chrDstW];
00158 
00159         for (i = 0; i < (chrDstW -7); i+=4) {
00160             vec_st(vini, i << 2, u);
00161             vec_st(vini, i << 2, v);
00162         }
00163         for (; i < chrDstW; i++) {
00164             u[i] = (1 << 18);
00165             v[i] = (1 << 18);
00166         }
00167 
00168         for (j = 0; j < chrFilterSize; j++) {
00169             vector signed short l1, l1_V, vChrFilter = vec_ld(j << 1, chrFilter);
00170             vector unsigned char perm, perm0 = vec_lvsl(j << 1, chrFilter);
00171             vChrFilter = vec_perm(vChrFilter, vChrFilter, perm0);
00172             vChrFilter = vec_splat(vChrFilter, 0); // chrFilter[j] is loaded 8 times in vChrFilter
00173 
00174             perm = vec_lvsl(0, chrUSrc[j]);
00175             l1 = vec_ld(0, chrUSrc[j]);
00176             l1_V = vec_ld(0, chrVSrc[j]);
00177 
00178             for (i = 0; i < (chrDstW - 7); i+=8) {
00179                 int offset = i << 2;
00180                 vector signed short l2 = vec_ld((i << 1) + 16, chrUSrc[j]);
00181                 vector signed short l2_V = vec_ld((i << 1) + 16, chrVSrc[j]);
00182 
00183                 vector signed int v1 = vec_ld(offset, u);
00184                 vector signed int v2 = vec_ld(offset + 16, u);
00185                 vector signed int v1_V = vec_ld(offset, v);
00186                 vector signed int v2_V = vec_ld(offset + 16, v);
00187 
00188                 vector signed short ls = vec_perm(l1, l2, perm); // chrUSrc[j][i] ... chrUSrc[j][i+7]
00189                 vector signed short ls_V = vec_perm(l1_V, l2_V, perm); // chrVSrc[j][i] ... chrVSrc[j][i]
00190 
00191                 vector signed int i1 = vec_mule(vChrFilter, ls);
00192                 vector signed int i2 = vec_mulo(vChrFilter, ls);
00193                 vector signed int i1_V = vec_mule(vChrFilter, ls_V);
00194                 vector signed int i2_V = vec_mulo(vChrFilter, ls_V);
00195 
00196                 vector signed int vf1 = vec_mergeh(i1, i2);
00197                 vector signed int vf2 = vec_mergel(i1, i2); // chrUSrc[j][i] * chrFilter[j] ... chrUSrc[j][i+7] * chrFilter[j]
00198                 vector signed int vf1_V = vec_mergeh(i1_V, i2_V);
00199                 vector signed int vf2_V = vec_mergel(i1_V, i2_V); // chrVSrc[j][i] * chrFilter[j] ... chrVSrc[j][i+7] * chrFilter[j]
00200 
00201                 vector signed int vo1 = vec_add(v1, vf1);
00202                 vector signed int vo2 = vec_add(v2, vf2);
00203                 vector signed int vo1_V = vec_add(v1_V, vf1_V);
00204                 vector signed int vo2_V = vec_add(v2_V, vf2_V);
00205 
00206                 vec_st(vo1, offset, u);
00207                 vec_st(vo2, offset + 16, u);
00208                 vec_st(vo1_V, offset, v);
00209                 vec_st(vo2_V, offset + 16, v);
00210 
00211                 l1 = l2;
00212                 l1_V = l2_V;
00213             }
00214             for ( ; i < chrDstW; i++) {
00215                 u[i] += chrUSrc[j][i] * chrFilter[j];
00216                 v[i] += chrVSrc[j][i] * chrFilter[j];
00217             }
00218         }
00219         altivec_packIntArrayToCharArray(u, uDest, chrDstW);
00220         altivec_packIntArrayToCharArray(v, vDest, chrDstW);
00221     }
00222 }
00223 
00224 static void hScale_altivec_real(int16_t *dst, int dstW,
00225                                 const uint8_t *src, int srcW,
00226                                 int xInc, const int16_t *filter,
00227                                 const int16_t *filterPos, int filterSize)
00228 {
00229     register int i;
00230     DECLARE_ALIGNED(16, int, tempo)[4];
00231 
00232     if (filterSize % 4) {
00233         for (i=0; i<dstW; i++) {
00234             register int j;
00235             register int srcPos = filterPos[i];
00236             register int val = 0;
00237             for (j=0; j<filterSize; j++) {
00238                 val += ((int)src[srcPos + j])*filter[filterSize*i + j];
00239             }
00240             dst[i] = FFMIN(val>>7, (1<<15)-1);
00241         }
00242     }
00243     else
00244     switch (filterSize) {
00245     case 4:
00246     {
00247     for (i=0; i<dstW; i++) {
00248         register int srcPos = filterPos[i];
00249 
00250         vector unsigned char src_v0 = vec_ld(srcPos, src);
00251         vector unsigned char src_v1, src_vF;
00252         vector signed short src_v, filter_v;
00253         vector signed int val_vEven, val_s;
00254         if ((((uintptr_t)src + srcPos) % 16) > 12) {
00255             src_v1 = vec_ld(srcPos + 16, src);
00256         }
00257         src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
00258 
00259         src_v = // vec_unpackh sign-extends...
00260             (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
00261         // now put our elements in the even slots
00262         src_v = vec_mergeh(src_v, (vector signed short)vzero);
00263 
00264         filter_v = vec_ld(i << 3, filter);
00265         // The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
00266 
00267         // The neat trick: We only care for half the elements,
00268         // high or low depending on (i<<3)%16 (it's 0 or 8 here),
00269         // and we're going to use vec_mule, so we choose
00270         // carefully how to "unpack" the elements into the even slots.
00271         if ((i << 3) % 16)
00272             filter_v = vec_mergel(filter_v, (vector signed short)vzero);
00273         else
00274             filter_v = vec_mergeh(filter_v, (vector signed short)vzero);
00275 
00276         val_vEven = vec_mule(src_v, filter_v);
00277         val_s = vec_sums(val_vEven, vzero);
00278         vec_st(val_s, 0, tempo);
00279         dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
00280     }
00281     }
00282     break;
00283 
00284     case 8:
00285     {
00286     for (i=0; i<dstW; i++) {
00287         register int srcPos = filterPos[i];
00288 
00289         vector unsigned char src_v0 = vec_ld(srcPos, src);
00290         vector unsigned char src_v1, src_vF;
00291         vector signed short src_v, filter_v;
00292         vector signed int val_v, val_s;
00293         if ((((uintptr_t)src + srcPos) % 16) > 8) {
00294             src_v1 = vec_ld(srcPos + 16, src);
00295         }
00296         src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
00297 
00298         src_v = // vec_unpackh sign-extends...
00299             (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
00300         filter_v = vec_ld(i << 4, filter);
00301         // the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
00302 
00303         val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
00304         val_s = vec_sums(val_v, vzero);
00305         vec_st(val_s, 0, tempo);
00306         dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
00307     }
00308     }
00309     break;
00310 
00311     case 16:
00312     {
00313         for (i=0; i<dstW; i++) {
00314             register int srcPos = filterPos[i];
00315 
00316             vector unsigned char src_v0 = vec_ld(srcPos, src);
00317             vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
00318             vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
00319 
00320             vector signed short src_vA = // vec_unpackh sign-extends...
00321                 (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
00322             vector signed short src_vB = // vec_unpackh sign-extends...
00323                 (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
00324 
00325             vector signed short filter_v0 = vec_ld(i << 5, filter);
00326             vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
00327             // the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
00328 
00329             vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
00330             vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
00331 
00332             vector signed int val_s = vec_sums(val_v, vzero);
00333 
00334             vec_st(val_s, 0, tempo);
00335             dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
00336         }
00337     }
00338     break;
00339 
00340     default:
00341     {
00342     for (i=0; i<dstW; i++) {
00343         register int j;
00344         register int srcPos = filterPos[i];
00345 
00346         vector signed int val_s, val_v = (vector signed int)vzero;
00347         vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
00348         vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
00349 
00350         vector unsigned char src_v0 = vec_ld(srcPos, src);
00351         vector unsigned char permS = vec_lvsl(srcPos, src);
00352 
00353         for (j = 0 ; j < filterSize - 15; j += 16) {
00354             vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
00355             vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
00356 
00357             vector signed short src_vA = // vec_unpackh sign-extends...
00358                 (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
00359             vector signed short src_vB = // vec_unpackh sign-extends...
00360                 (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
00361 
00362             vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
00363             vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
00364             vector signed short filter_v0  = vec_perm(filter_v0R, filter_v1R, permF);
00365             vector signed short filter_v1  = vec_perm(filter_v1R, filter_v2R, permF);
00366 
00367             vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
00368             val_v = vec_msums(src_vB, filter_v1, val_acc);
00369 
00370             filter_v0R = filter_v2R;
00371             src_v0 = src_v1;
00372         }
00373 
00374         if (j < filterSize-7) {
00375             // loading src_v0 is useless, it's already done above
00376             //vector unsigned char src_v0 = vec_ld(srcPos + j, src);
00377             vector unsigned char src_v1, src_vF;
00378             vector signed short src_v, filter_v1R, filter_v;
00379             if ((((uintptr_t)src + srcPos) % 16) > 8) {
00380                 src_v1 = vec_ld(srcPos + j + 16, src);
00381             }
00382             src_vF = vec_perm(src_v0, src_v1, permS);
00383 
00384             src_v = // vec_unpackh sign-extends...
00385                 (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
00386             // loading filter_v0R is useless, it's already done above
00387             //vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
00388             filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
00389             filter_v = vec_perm(filter_v0R, filter_v1R, permF);
00390 
00391             val_v = vec_msums(src_v, filter_v, val_v);
00392         }
00393 
00394         val_s = vec_sums(val_v, vzero);
00395 
00396         vec_st(val_s, 0, tempo);
00397         dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
00398     }
00399 
00400     }
00401     }
00402 }
00403 
00404 void ff_sws_init_swScale_altivec(SwsContext *c)
00405 {
00406     enum PixelFormat dstFormat = c->dstFormat;
00407 
00408     if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
00409         return;
00410 
00411     c->hScale       = hScale_altivec_real;
00412     if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat)) {
00413         c->yuv2yuvX     = yuv2yuvX_altivec_real;
00414     }
00415 
00416     /* The following list of supported dstFormat values should
00417      * match what's found in the body of ff_yuv2packedX_altivec() */
00418     if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf &&
00419         (c->dstFormat==PIX_FMT_ABGR  || c->dstFormat==PIX_FMT_BGRA  ||
00420          c->dstFormat==PIX_FMT_BGR24 || c->dstFormat==PIX_FMT_RGB24 ||
00421          c->dstFormat==PIX_FMT_RGBA  || c->dstFormat==PIX_FMT_ARGB)) {
00422             c->yuv2packedX  = ff_yuv2packedX_altivec;
00423         }
00424 }

Generated on Wed Apr 11 2012 07:31:37 for FFmpeg by  doxygen 1.7.1