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FFmpeg/libavcodec/ppc/h264_altivec.c

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  1. /*

  2.  * Copyright (c) 2004 Romain Dolbeau <romain@dolbeau.org>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "libavutil/cpu.h"

  22. #include "libavutil/intreadwrite.h"

  23. #include "libavutil/ppc/types_altivec.h"

  24. #include "libavutil/ppc/util_altivec.h"

  25. #include "libavcodec/h264data.h"

  26. #include "libavcodec/h264dsp.h"

  27. 

  28. /****************************************************************************

  29.  * IDCT transform:

  30.  ****************************************************************************/

  31. 

  32. #define VEC_1D_DCT(vb0,vb1,vb2,vb3,va0,va1,va2,va3)               \

  33.     /* 1st stage */                                               \

  34.     vz0 = vec_add(vb0,vb2);       /* temp[0] = Y[0] + Y[2] */     \

  35.     vz1 = vec_sub(vb0,vb2);       /* temp[1] = Y[0] - Y[2] */     \

  36.     vz2 = vec_sra(vb1,vec_splat_u16(1));                          \

  37.     vz2 = vec_sub(vz2,vb3);       /* temp[2] = Y[1].1/2 - Y[3] */ \

  38.     vz3 = vec_sra(vb3,vec_splat_u16(1));                          \

  39.     vz3 = vec_add(vb1,vz3);       /* temp[3] = Y[1] + Y[3].1/2 */ \

  40.     /* 2nd stage: output */                                       \

  41.     va0 = vec_add(vz0,vz3);       /* x[0] = temp[0] + temp[3] */  \

  42.     va1 = vec_add(vz1,vz2);       /* x[1] = temp[1] + temp[2] */  \

  43.     va2 = vec_sub(vz1,vz2);       /* x[2] = temp[1] - temp[2] */  \

  44.     va3 = vec_sub(vz0,vz3)        /* x[3] = temp[0] - temp[3] */

  45. 

  46. #define VEC_TRANSPOSE_4(a0,a1,a2,a3,b0,b1,b2,b3) \

  47.     b0 = vec_mergeh( a0, a0 ); \

  48.     b1 = vec_mergeh( a1, a0 ); \

  49.     b2 = vec_mergeh( a2, a0 ); \

  50.     b3 = vec_mergeh( a3, a0 ); \

  51.     a0 = vec_mergeh( b0, b2 ); \

  52.     a1 = vec_mergel( b0, b2 ); \

  53.     a2 = vec_mergeh( b1, b3 ); \

  54.     a3 = vec_mergel( b1, b3 ); \

  55.     b0 = vec_mergeh( a0, a2 ); \

  56.     b1 = vec_mergel( a0, a2 ); \

  57.     b2 = vec_mergeh( a1, a3 ); \

  58.     b3 = vec_mergel( a1, a3 )

  59. 

  60. #define VEC_LOAD_U8_ADD_S16_STORE_U8(va)                      \

  61.     vdst_orig = vec_ld(0, dst);                               \

  62.     vdst = vec_perm(vdst_orig, zero_u8v, vdst_mask);          \

  63.     vdst_ss = (vec_s16) vec_mergeh(zero_u8v, vdst);         \

  64.     va = vec_add(va, vdst_ss);                                \

  65.     va_u8 = vec_packsu(va, zero_s16v);                        \

  66.     va_u32 = vec_splat((vec_u32)va_u8, 0);                  \

  67.     vec_ste(va_u32, element, (uint32_t*)dst);

  68. 

  69. static void ff_h264_idct_add_altivec(uint8_t *dst, int16_t *block, int stride)

  70. {

  71.     vec_s16 va0, va1, va2, va3;

  72.     vec_s16 vz0, vz1, vz2, vz3;

  73.     vec_s16 vtmp0, vtmp1, vtmp2, vtmp3;

  74.     vec_u8 va_u8;

  75.     vec_u32 va_u32;

  76.     vec_s16 vdst_ss;

  77.     const vec_u16 v6us = vec_splat_u16(6);

  78.     vec_u8 vdst, vdst_orig;

  79.     vec_u8 vdst_mask = vec_lvsl(0, dst);

  80.     int element = ((unsigned long)dst & 0xf) >> 2;

  81.     LOAD_ZERO;

  82. 

  83.     block[0] += 32;  /* add 32 as a DC-level for rounding */

  84. 

  85.     vtmp0 = vec_ld(0,block);

  86.     vtmp1 = vec_sld(vtmp0, vtmp0, 8);

  87.     vtmp2 = vec_ld(16,block);

  88.     vtmp3 = vec_sld(vtmp2, vtmp2, 8);

  89. 

  90.     VEC_1D_DCT(vtmp0,vtmp1,vtmp2,vtmp3,va0,va1,va2,va3);

  91.     VEC_TRANSPOSE_4(va0,va1,va2,va3,vtmp0,vtmp1,vtmp2,vtmp3);

  92.     VEC_1D_DCT(vtmp0,vtmp1,vtmp2,vtmp3,va0,va1,va2,va3);

  93. 

  94.     va0 = vec_sra(va0,v6us);

  95.     va1 = vec_sra(va1,v6us);

  96.     va2 = vec_sra(va2,v6us);

  97.     va3 = vec_sra(va3,v6us);

  98. 

  99.     VEC_LOAD_U8_ADD_S16_STORE_U8(va0);

  100.     dst += stride;

  101.     VEC_LOAD_U8_ADD_S16_STORE_U8(va1);

  102.     dst += stride;

  103.     VEC_LOAD_U8_ADD_S16_STORE_U8(va2);

  104.     dst += stride;

  105.     VEC_LOAD_U8_ADD_S16_STORE_U8(va3);

  106. }

  107. 

  108. #define IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7,  d0, d1, d2, d3, d4, d5, d6, d7) {\

  109.     /*        a0  = SRC(0) + SRC(4); */ \

  110.     vec_s16 a0v = vec_add(s0, s4);    \

  111.     /*        a2  = SRC(0) - SRC(4); */ \

  112.     vec_s16 a2v = vec_sub(s0, s4);    \

  113.     /*        a4  =           (SRC(2)>>1) - SRC(6); */ \

  114.     vec_s16 a4v = vec_sub(vec_sra(s2, onev), s6);    \

  115.     /*        a6  =           (SRC(6)>>1) + SRC(2); */ \

  116.     vec_s16 a6v = vec_add(vec_sra(s6, onev), s2);    \

  117.     /*        b0  =         a0 + a6; */ \

  118.     vec_s16 b0v = vec_add(a0v, a6v);  \

  119.     /*        b2  =         a2 + a4; */ \

  120.     vec_s16 b2v = vec_add(a2v, a4v);  \

  121.     /*        b4  =         a2 - a4; */ \

  122.     vec_s16 b4v = vec_sub(a2v, a4v);  \

  123.     /*        b6  =         a0 - a6; */ \

  124.     vec_s16 b6v = vec_sub(a0v, a6v);  \

  125.     /* a1 =  SRC(5) - SRC(3) - SRC(7) - (SRC(7)>>1); */ \

  126.     /*        a1 =             (SRC(5)-SRC(3)) -  (SRC(7)  +  (SRC(7)>>1)); */ \

  127.     vec_s16 a1v = vec_sub( vec_sub(s5, s3), vec_add(s7, vec_sra(s7, onev)) ); \

  128.     /* a3 =  SRC(7) + SRC(1) - SRC(3) - (SRC(3)>>1); */ \

  129.     /*        a3 =             (SRC(7)+SRC(1)) -  (SRC(3)  +  (SRC(3)>>1)); */ \

  130.     vec_s16 a3v = vec_sub( vec_add(s7, s1), vec_add(s3, vec_sra(s3, onev)) );\

  131.     /* a5 =  SRC(7) - SRC(1) + SRC(5) + (SRC(5)>>1); */ \

  132.     /*        a5 =             (SRC(7)-SRC(1)) +   SRC(5) +   (SRC(5)>>1); */ \

  133.     vec_s16 a5v = vec_add( vec_sub(s7, s1), vec_add(s5, vec_sra(s5, onev)) );\

  134.     /*        a7 =                SRC(5)+SRC(3) +  SRC(1) +   (SRC(1)>>1); */ \

  135.     vec_s16 a7v = vec_add( vec_add(s5, s3), vec_add(s1, vec_sra(s1, onev)) );\

  136.     /*        b1 =                  (a7>>2)  +  a1; */ \

  137.     vec_s16 b1v = vec_add( vec_sra(a7v, twov), a1v); \

  138.     /*        b3 =          a3 +        (a5>>2); */ \

  139.     vec_s16 b3v = vec_add(a3v, vec_sra(a5v, twov)); \

  140.     /*        b5 =                  (a3>>2)  -   a5; */ \

  141.     vec_s16 b5v = vec_sub( vec_sra(a3v, twov), a5v); \

  142.     /*        b7 =           a7 -        (a1>>2); */ \

  143.     vec_s16 b7v = vec_sub( a7v, vec_sra(a1v, twov)); \

  144.     /* DST(0,    b0 + b7); */ \

  145.     d0 = vec_add(b0v, b7v); \

  146.     /* DST(1,    b2 + b5); */ \

  147.     d1 = vec_add(b2v, b5v); \

  148.     /* DST(2,    b4 + b3); */ \

  149.     d2 = vec_add(b4v, b3v); \

  150.     /* DST(3,    b6 + b1); */ \

  151.     d3 = vec_add(b6v, b1v); \

  152.     /* DST(4,    b6 - b1); */ \

  153.     d4 = vec_sub(b6v, b1v); \

  154.     /* DST(5,    b4 - b3); */ \

  155.     d5 = vec_sub(b4v, b3v); \

  156.     /* DST(6,    b2 - b5); */ \

  157.     d6 = vec_sub(b2v, b5v); \

  158.     /* DST(7,    b0 - b7); */ \

  159.     d7 = vec_sub(b0v, b7v); \

  160. }

  161. 

  162. #define ALTIVEC_STORE_SUM_CLIP(dest, idctv, perm_ldv, perm_stv, sel) { \

  163.     /* unaligned load */                                       \

  164.     vec_u8 hv = vec_ld( 0, dest );                           \

  165.     vec_u8 lv = vec_ld( 7, dest );                           \

  166.     vec_u8 dstv   = vec_perm( hv, lv, (vec_u8)perm_ldv );  \

  167.     vec_s16 idct_sh6 = vec_sra(idctv, sixv);                 \

  168.     vec_u16 dst16 = (vec_u16)vec_mergeh(zero_u8v, dstv);   \

  169.     vec_s16 idstsum = vec_adds(idct_sh6, (vec_s16)dst16);  \

  170.     vec_u8 idstsum8 = vec_packsu(zero_s16v, idstsum);        \

  171.     vec_u8 edgehv;                                           \

  172.     /* unaligned store */                                      \

  173.     vec_u8 bodyv  = vec_perm( idstsum8, idstsum8, perm_stv );\

  174.     vec_u8 edgelv = vec_perm( sel, zero_u8v, perm_stv );     \

  175.     lv    = vec_sel( lv, bodyv, edgelv );                      \

  176.     vec_st( lv, 7, dest );                                     \

  177.     hv    = vec_ld( 0, dest );                                 \

  178.     edgehv = vec_perm( zero_u8v, sel, perm_stv );              \

  179.     hv    = vec_sel( hv, bodyv, edgehv );                      \

  180.     vec_st( hv, 0, dest );                                     \

  181.  }

  182. 

  183. static void ff_h264_idct8_add_altivec( uint8_t *dst, int16_t *dct, int stride ) {

  184.     vec_s16 s0, s1, s2, s3, s4, s5, s6, s7;

  185.     vec_s16 d0, d1, d2, d3, d4, d5, d6, d7;

  186.     vec_s16 idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7;

  187. 

  188.     vec_u8 perm_ldv = vec_lvsl(0, dst);

  189.     vec_u8 perm_stv = vec_lvsr(8, dst);

  190. 

  191.     const vec_u16 onev = vec_splat_u16(1);

  192.     const vec_u16 twov = vec_splat_u16(2);

  193.     const vec_u16 sixv = vec_splat_u16(6);

  194. 

  195.     const vec_u8 sel = (vec_u8) {0,0,0,0,0,0,0,0,-1,-1,-1,-1,-1,-1,-1,-1};

  196.     LOAD_ZERO;

  197. 

  198.     dct[0] += 32; // rounding for the >>6 at the end

  199. 

  200.     s0 = vec_ld(0x00, (int16_t*)dct);

  201.     s1 = vec_ld(0x10, (int16_t*)dct);

  202.     s2 = vec_ld(0x20, (int16_t*)dct);

  203.     s3 = vec_ld(0x30, (int16_t*)dct);

  204.     s4 = vec_ld(0x40, (int16_t*)dct);

  205.     s5 = vec_ld(0x50, (int16_t*)dct);

  206.     s6 = vec_ld(0x60, (int16_t*)dct);

  207.     s7 = vec_ld(0x70, (int16_t*)dct);

  208. 

  209.     IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7,

  210.                      d0, d1, d2, d3, d4, d5, d6, d7);

  211. 

  212.     TRANSPOSE8( d0,  d1,  d2,  d3,  d4,  d5,  d6, d7 );

  213. 

  214.     IDCT8_1D_ALTIVEC(d0,  d1,  d2,  d3,  d4,  d5,  d6, d7,

  215.                      idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7);

  216. 

  217.     ALTIVEC_STORE_SUM_CLIP(&dst[0*stride], idct0, perm_ldv, perm_stv, sel);

  218.     ALTIVEC_STORE_SUM_CLIP(&dst[1*stride], idct1, perm_ldv, perm_stv, sel);

  219.     ALTIVEC_STORE_SUM_CLIP(&dst[2*stride], idct2, perm_ldv, perm_stv, sel);

  220.     ALTIVEC_STORE_SUM_CLIP(&dst[3*stride], idct3, perm_ldv, perm_stv, sel);

  221.     ALTIVEC_STORE_SUM_CLIP(&dst[4*stride], idct4, perm_ldv, perm_stv, sel);

  222.     ALTIVEC_STORE_SUM_CLIP(&dst[5*stride], idct5, perm_ldv, perm_stv, sel);

  223.     ALTIVEC_STORE_SUM_CLIP(&dst[6*stride], idct6, perm_ldv, perm_stv, sel);

  224.     ALTIVEC_STORE_SUM_CLIP(&dst[7*stride], idct7, perm_ldv, perm_stv, sel);

  225. }

  226. 

  227. static av_always_inline void h264_idct_dc_add_internal(uint8_t *dst, int16_t *block, int stride, int size)

  228. {

  229.     vec_s16 dc16;

  230.     vec_u8 dcplus, dcminus, v0, v1, v2, v3, aligner;

  231.     LOAD_ZERO;

  232.     DECLARE_ALIGNED(16, int, dc);

  233.     int i;

  234. 

  235.     dc = (block[0] + 32) >> 6;

  236.     dc16 = vec_splat((vec_s16) vec_lde(0, &dc), 1);

  237. 

  238.     if (size == 4)

  239.         dc16 = vec_sld(dc16, zero_s16v, 8);

  240.     dcplus = vec_packsu(dc16, zero_s16v);

  241.     dcminus = vec_packsu(vec_sub(zero_s16v, dc16), zero_s16v);

  242. 

  243.     aligner = vec_lvsr(0, dst);

  244.     dcplus = vec_perm(dcplus, dcplus, aligner);

  245.     dcminus = vec_perm(dcminus, dcminus, aligner);

  246. 

  247.     for (i = 0; i < size; i += 4) {

  248.         v0 = vec_ld(0, dst+0*stride);

  249.         v1 = vec_ld(0, dst+1*stride);

  250.         v2 = vec_ld(0, dst+2*stride);

  251.         v3 = vec_ld(0, dst+3*stride);

  252. 

  253.         v0 = vec_adds(v0, dcplus);

  254.         v1 = vec_adds(v1, dcplus);

  255.         v2 = vec_adds(v2, dcplus);

  256.         v3 = vec_adds(v3, dcplus);

  257. 

  258.         v0 = vec_subs(v0, dcminus);

  259.         v1 = vec_subs(v1, dcminus);

  260.         v2 = vec_subs(v2, dcminus);

  261.         v3 = vec_subs(v3, dcminus);

  262. 

  263.         vec_st(v0, 0, dst+0*stride);

  264.         vec_st(v1, 0, dst+1*stride);

  265.         vec_st(v2, 0, dst+2*stride);

  266.         vec_st(v3, 0, dst+3*stride);

  267. 

  268.         dst += 4*stride;

  269.     }

  270. }

  271. 

  272. static void h264_idct_dc_add_altivec(uint8_t *dst, int16_t *block, int stride)

  273. {

  274.     h264_idct_dc_add_internal(dst, block, stride, 4);

  275. }

  276. 

  277. static void ff_h264_idct8_dc_add_altivec(uint8_t *dst, int16_t *block, int stride)

  278. {

  279.     h264_idct_dc_add_internal(dst, block, stride, 8);

  280. }

  281. 

  282. static void ff_h264_idct_add16_altivec(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){

  283.     int i;

  284.     for(i=0; i<16; i++){

  285.         int nnz = nnzc[ scan8[i] ];

  286.         if(nnz){

  287.             if(nnz==1 && block[i*16]) h264_idct_dc_add_altivec(dst + block_offset[i], block + i*16, stride);

  288.             else                      ff_h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);

  289.         }

  290.     }

  291. }

  292. 

  293. static void ff_h264_idct_add16intra_altivec(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){

  294.     int i;

  295.     for(i=0; i<16; i++){

  296.         if(nnzc[ scan8[i] ]) ff_h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);

  297.         else if(block[i*16]) h264_idct_dc_add_altivec(dst + block_offset[i], block + i*16, stride);

  298.     }

  299. }

  300. 

  301. static void ff_h264_idct8_add4_altivec(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){

  302.     int i;

  303.     for(i=0; i<16; i+=4){

  304.         int nnz = nnzc[ scan8[i] ];

  305.         if(nnz){

  306.             if(nnz==1 && block[i*16]) ff_h264_idct8_dc_add_altivec(dst + block_offset[i], block + i*16, stride);

  307.             else                      ff_h264_idct8_add_altivec   (dst + block_offset[i], block + i*16, stride);

  308.         }

  309.     }

  310. }

  311. 

  312. static void ff_h264_idct_add8_altivec(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){

  313.     int i, j;

  314.     for (j = 1; j < 3; j++) {

  315.         for(i = j * 16; i < j * 16 + 4; i++){

  316.             if(nnzc[ scan8[i] ])

  317.                 ff_h264_idct_add_altivec(dest[j-1] + block_offset[i], block + i*16, stride);

  318.             else if(block[i*16])

  319.                 h264_idct_dc_add_altivec(dest[j-1] + block_offset[i], block + i*16, stride);

  320.         }

  321.     }

  322. }

  323. 

  324. #define transpose4x16(r0, r1, r2, r3) {      \

  325.     register vec_u8 r4;                    \

  326.     register vec_u8 r5;                    \

  327.     register vec_u8 r6;                    \

  328.     register vec_u8 r7;                    \

  329.                                              \

  330.     r4 = vec_mergeh(r0, r2);  /*0, 2 set 0*/ \

  331.     r5 = vec_mergel(r0, r2);  /*0, 2 set 1*/ \

  332.     r6 = vec_mergeh(r1, r3);  /*1, 3 set 0*/ \

  333.     r7 = vec_mergel(r1, r3);  /*1, 3 set 1*/ \

  334.                                              \

  335.     r0 = vec_mergeh(r4, r6);  /*all set 0*/  \

  336.     r1 = vec_mergel(r4, r6);  /*all set 1*/  \

  337.     r2 = vec_mergeh(r5, r7);  /*all set 2*/  \

  338.     r3 = vec_mergel(r5, r7);  /*all set 3*/  \

  339. }

  340. 

  341. static inline void write16x4(uint8_t *dst, int dst_stride,

  342.                              register vec_u8 r0, register vec_u8 r1,

  343.                              register vec_u8 r2, register vec_u8 r3) {

  344.     DECLARE_ALIGNED(16, unsigned char, result)[64];

  345.     uint32_t *src_int = (uint32_t *)result, *dst_int = (uint32_t *)dst;

  346.     int int_dst_stride = dst_stride/4;

  347. 

  348.     vec_st(r0, 0, result);

  349.     vec_st(r1, 16, result);

  350.     vec_st(r2, 32, result);

  351.     vec_st(r3, 48, result);

  352.     /* FIXME: there has to be a better way!!!! */

  353.     *dst_int = *src_int;

  354.     *(dst_int+   int_dst_stride) = *(src_int + 1);

  355.     *(dst_int+ 2*int_dst_stride) = *(src_int + 2);

  356.     *(dst_int+ 3*int_dst_stride) = *(src_int + 3);

  357.     *(dst_int+ 4*int_dst_stride) = *(src_int + 4);

  358.     *(dst_int+ 5*int_dst_stride) = *(src_int + 5);

  359.     *(dst_int+ 6*int_dst_stride) = *(src_int + 6);

  360.     *(dst_int+ 7*int_dst_stride) = *(src_int + 7);

  361.     *(dst_int+ 8*int_dst_stride) = *(src_int + 8);

  362.     *(dst_int+ 9*int_dst_stride) = *(src_int + 9);

  363.     *(dst_int+10*int_dst_stride) = *(src_int + 10);

  364.     *(dst_int+11*int_dst_stride) = *(src_int + 11);

  365.     *(dst_int+12*int_dst_stride) = *(src_int + 12);

  366.     *(dst_int+13*int_dst_stride) = *(src_int + 13);

  367.     *(dst_int+14*int_dst_stride) = *(src_int + 14);

  368.     *(dst_int+15*int_dst_stride) = *(src_int + 15);

  369. }

  370. 

  371. /** @brief performs a 6x16 transpose of data in src, and stores it to dst

  372.     @todo FIXME: see if we can't spare some vec_lvsl() by them factorizing

  373.     out of unaligned_load() */

  374. #define readAndTranspose16x6(src, src_stride, r8, r9, r10, r11, r12, r13) {\

  375.     register vec_u8 r0  = unaligned_load(0,             src);            \

  376.     register vec_u8 r1  = unaligned_load(   src_stride, src);            \

  377.     register vec_u8 r2  = unaligned_load(2* src_stride, src);            \

  378.     register vec_u8 r3  = unaligned_load(3* src_stride, src);            \

  379.     register vec_u8 r4  = unaligned_load(4* src_stride, src);            \

  380.     register vec_u8 r5  = unaligned_load(5* src_stride, src);            \

  381.     register vec_u8 r6  = unaligned_load(6* src_stride, src);            \

  382.     register vec_u8 r7  = unaligned_load(7* src_stride, src);            \

  383.     register vec_u8 r14 = unaligned_load(14*src_stride, src);            \

  384.     register vec_u8 r15 = unaligned_load(15*src_stride, src);            \

  385.                                                                            \

  386.     r8  = unaligned_load( 8*src_stride, src);                              \

  387.     r9  = unaligned_load( 9*src_stride, src);                              \

  388.     r10 = unaligned_load(10*src_stride, src);                              \

  389.     r11 = unaligned_load(11*src_stride, src);                              \

  390.     r12 = unaligned_load(12*src_stride, src);                              \

  391.     r13 = unaligned_load(13*src_stride, src);                              \

  392.                                                                            \

  393.     /*Merge first pairs*/                                                  \

  394.     r0 = vec_mergeh(r0, r8);    /*0, 8*/                                   \

  395.     r1 = vec_mergeh(r1, r9);    /*1, 9*/                                   \

  396.     r2 = vec_mergeh(r2, r10);   /*2,10*/                                   \

  397.     r3 = vec_mergeh(r3, r11);   /*3,11*/                                   \

  398.     r4 = vec_mergeh(r4, r12);   /*4,12*/                                   \

  399.     r5 = vec_mergeh(r5, r13);   /*5,13*/                                   \

  400.     r6 = vec_mergeh(r6, r14);   /*6,14*/                                   \

  401.     r7 = vec_mergeh(r7, r15);   /*7,15*/                                   \

  402.                                                                            \

  403.     /*Merge second pairs*/                                                 \

  404.     r8  = vec_mergeh(r0, r4);   /*0,4, 8,12 set 0*/                        \

  405.     r9  = vec_mergel(r0, r4);   /*0,4, 8,12 set 1*/                        \

  406.     r10 = vec_mergeh(r1, r5);   /*1,5, 9,13 set 0*/                        \

  407.     r11 = vec_mergel(r1, r5);   /*1,5, 9,13 set 1*/                        \

  408.     r12 = vec_mergeh(r2, r6);   /*2,6,10,14 set 0*/                        \

  409.     r13 = vec_mergel(r2, r6);   /*2,6,10,14 set 1*/                        \

  410.     r14 = vec_mergeh(r3, r7);   /*3,7,11,15 set 0*/                        \

  411.     r15 = vec_mergel(r3, r7);   /*3,7,11,15 set 1*/                        \

  412.                                                                            \

  413.     /*Third merge*/                                                        \

  414.     r0 = vec_mergeh(r8,  r12);  /*0,2,4,6,8,10,12,14 set 0*/               \

  415.     r1 = vec_mergel(r8,  r12);  /*0,2,4,6,8,10,12,14 set 1*/               \

  416.     r2 = vec_mergeh(r9,  r13);  /*0,2,4,6,8,10,12,14 set 2*/               \

  417.     r4 = vec_mergeh(r10, r14);  /*1,3,5,7,9,11,13,15 set 0*/               \

  418.     r5 = vec_mergel(r10, r14);  /*1,3,5,7,9,11,13,15 set 1*/               \

  419.     r6 = vec_mergeh(r11, r15);  /*1,3,5,7,9,11,13,15 set 2*/               \

  420.     /* Don't need to compute 3 and 7*/                                     \

  421.                                                                            \

  422.     /*Final merge*/                                                        \

  423.     r8  = vec_mergeh(r0, r4);   /*all set 0*/                              \

  424.     r9  = vec_mergel(r0, r4);   /*all set 1*/                              \

  425.     r10 = vec_mergeh(r1, r5);   /*all set 2*/                              \

  426.     r11 = vec_mergel(r1, r5);   /*all set 3*/                              \

  427.     r12 = vec_mergeh(r2, r6);   /*all set 4*/                              \

  428.     r13 = vec_mergel(r2, r6);   /*all set 5*/                              \

  429.     /* Don't need to compute 14 and 15*/                                   \

  430.                                                                            \

  431. }

  432. 

  433. // out: o = |x-y| < a

  434. static inline vec_u8 diff_lt_altivec ( register vec_u8 x,

  435.                                          register vec_u8 y,

  436.                                          register vec_u8 a) {

  437. 

  438.     register vec_u8 diff = vec_subs(x, y);

  439.     register vec_u8 diffneg = vec_subs(y, x);

  440.     register vec_u8 o = vec_or(diff, diffneg); /* |x-y| */

  441.     o = (vec_u8)vec_cmplt(o, a);

  442.     return o;

  443. }

  444. 

  445. static inline vec_u8 h264_deblock_mask ( register vec_u8 p0,

  446.                                            register vec_u8 p1,

  447.                                            register vec_u8 q0,

  448.                                            register vec_u8 q1,

  449.                                            register vec_u8 alpha,

  450.                                            register vec_u8 beta) {

  451. 

  452.     register vec_u8 mask;

  453.     register vec_u8 tempmask;

  454. 

  455.     mask = diff_lt_altivec(p0, q0, alpha);

  456.     tempmask = diff_lt_altivec(p1, p0, beta);

  457.     mask = vec_and(mask, tempmask);

  458.     tempmask = diff_lt_altivec(q1, q0, beta);

  459.     mask = vec_and(mask, tempmask);

  460. 

  461.     return mask;

  462. }

  463. 

  464. // out: newp1 = clip((p2 + ((p0 + q0 + 1) >> 1)) >> 1, p1-tc0, p1+tc0)

  465. static inline vec_u8 h264_deblock_q1(register vec_u8 p0,

  466.                                        register vec_u8 p1,

  467.                                        register vec_u8 p2,

  468.                                        register vec_u8 q0,

  469.                                        register vec_u8 tc0) {

  470. 

  471.     register vec_u8 average = vec_avg(p0, q0);

  472.     register vec_u8 temp;

  473.     register vec_u8 uncliped;

  474.     register vec_u8 ones;

  475.     register vec_u8 max;

  476.     register vec_u8 min;

  477.     register vec_u8 newp1;

  478. 

  479.     temp = vec_xor(average, p2);

  480.     average = vec_avg(average, p2);     /*avg(p2, avg(p0, q0)) */

  481.     ones = vec_splat_u8(1);

  482.     temp = vec_and(temp, ones);         /*(p2^avg(p0, q0)) & 1 */

  483.     uncliped = vec_subs(average, temp); /*(p2+((p0+q0+1)>>1))>>1 */

  484.     max = vec_adds(p1, tc0);

  485.     min = vec_subs(p1, tc0);

  486.     newp1 = vec_max(min, uncliped);

  487.     newp1 = vec_min(max, newp1);

  488.     return newp1;

  489. }

  490. 

  491. #define h264_deblock_p0_q0(p0, p1, q0, q1, tc0masked) {                                           \

  492.                                                                                                   \

  493.     const vec_u8 A0v = vec_sl(vec_splat_u8(10), vec_splat_u8(4));                               \

  494.                                                                                                   \

  495.     register vec_u8 pq0bit = vec_xor(p0,q0);                                                    \

  496.     register vec_u8 q1minus;                                                                    \

  497.     register vec_u8 p0minus;                                                                    \

  498.     register vec_u8 stage1;                                                                     \

  499.     register vec_u8 stage2;                                                                     \

  500.     register vec_u8 vec160;                                                                     \

  501.     register vec_u8 delta;                                                                      \

  502.     register vec_u8 deltaneg;                                                                   \

  503.                                                                                                   \

  504.     q1minus = vec_nor(q1, q1);                 /* 255 - q1 */                                     \

  505.     stage1 = vec_avg(p1, q1minus);             /* (p1 - q1 + 256)>>1 */                           \

  506.     stage2 = vec_sr(stage1, vec_splat_u8(1));  /* (p1 - q1 + 256)>>2 = 64 + (p1 - q1) >> 2 */     \

  507.     p0minus = vec_nor(p0, p0);                 /* 255 - p0 */                                     \

  508.     stage1 = vec_avg(q0, p0minus);             /* (q0 - p0 + 256)>>1 */                           \

  509.     pq0bit = vec_and(pq0bit, vec_splat_u8(1));                                                    \

  510.     stage2 = vec_avg(stage2, pq0bit);          /* 32 + ((q0 - p0)&1 + (p1 - q1) >> 2 + 1) >> 1 */ \

  511.     stage2 = vec_adds(stage2, stage1);         /* 160 + ((p0 - q0) + (p1 - q1) >> 2 + 1) >> 1 */  \

  512.     vec160 = vec_ld(0, &A0v);                                                                     \

  513.     deltaneg = vec_subs(vec160, stage2);       /* -d */                                           \

  514.     delta = vec_subs(stage2, vec160);          /* d */                                            \

  515.     deltaneg = vec_min(tc0masked, deltaneg);                                                      \

  516.     delta = vec_min(tc0masked, delta);                                                            \

  517.     p0 = vec_subs(p0, deltaneg);                                                                  \

  518.     q0 = vec_subs(q0, delta);                                                                     \

  519.     p0 = vec_adds(p0, delta);                                                                     \

  520.     q0 = vec_adds(q0, deltaneg);                                                                  \

  521. }

  522. 

  523. #define h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0) {            \

  524.     DECLARE_ALIGNED(16, unsigned char, temp)[16];                                             \

  525.     register vec_u8 alphavec;                                                              \

  526.     register vec_u8 betavec;                                                               \

  527.     register vec_u8 mask;                                                                  \

  528.     register vec_u8 p1mask;                                                                \

  529.     register vec_u8 q1mask;                                                                \

  530.     register vector signed   char tc0vec;                                                    \

  531.     register vec_u8 finaltc0;                                                              \

  532.     register vec_u8 tc0masked;                                                             \

  533.     register vec_u8 newp1;                                                                 \

  534.     register vec_u8 newq1;                                                                 \

  535.                                                                                              \

  536.     temp[0] = alpha;                                                                         \

  537.     temp[1] = beta;                                                                          \

  538.     alphavec = vec_ld(0, temp);                                                              \

  539.     betavec = vec_splat(alphavec, 0x1);                                                      \

  540.     alphavec = vec_splat(alphavec, 0x0);                                                     \

  541.     mask = h264_deblock_mask(p0, p1, q0, q1, alphavec, betavec); /*if in block */            \

  542.                                                                                              \

  543.     AV_COPY32(temp, tc0);                                                                    \

  544.     tc0vec = vec_ld(0, (signed char*)temp);                                                  \

  545.     tc0vec = vec_mergeh(tc0vec, tc0vec);                                                     \

  546.     tc0vec = vec_mergeh(tc0vec, tc0vec);                                                     \

  547.     mask = vec_and(mask, vec_cmpgt(tc0vec, vec_splat_s8(-1)));  /* if tc0[i] >= 0 */         \

  548.     finaltc0 = vec_and((vec_u8)tc0vec, mask);     /* tc = tc0 */                           \

  549.                                                                                              \

  550.     p1mask = diff_lt_altivec(p2, p0, betavec);                                               \

  551.     p1mask = vec_and(p1mask, mask);                             /* if ( |p2 - p0| < beta) */ \

  552.     tc0masked = vec_and(p1mask, (vec_u8)tc0vec);                                           \

  553.     finaltc0 = vec_sub(finaltc0, p1mask);                       /* tc++ */                   \

  554.     newp1 = h264_deblock_q1(p0, p1, p2, q0, tc0masked);                                      \

  555.     /*end if*/                                                                               \

  556.                                                                                              \

  557.     q1mask = diff_lt_altivec(q2, q0, betavec);                                               \

  558.     q1mask = vec_and(q1mask, mask);                             /* if ( |q2 - q0| < beta ) */\

  559.     tc0masked = vec_and(q1mask, (vec_u8)tc0vec);                                           \

  560.     finaltc0 = vec_sub(finaltc0, q1mask);                       /* tc++ */                   \

  561.     newq1 = h264_deblock_q1(p0, q1, q2, q0, tc0masked);                                      \

  562.     /*end if*/                                                                               \

  563.                                                                                              \

  564.     h264_deblock_p0_q0(p0, p1, q0, q1, finaltc0);                                            \

  565.     p1 = newp1;                                                                              \

  566.     q1 = newq1;                                                                              \

  567. }

  568. 

  569. static void h264_v_loop_filter_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {

  570. 

  571.     if ((tc0[0] & tc0[1] & tc0[2] & tc0[3]) >= 0) {

  572.         register vec_u8 p2 = vec_ld(-3*stride, pix);

  573.         register vec_u8 p1 = vec_ld(-2*stride, pix);

  574.         register vec_u8 p0 = vec_ld(-1*stride, pix);

  575.         register vec_u8 q0 = vec_ld(0, pix);

  576.         register vec_u8 q1 = vec_ld(stride, pix);

  577.         register vec_u8 q2 = vec_ld(2*stride, pix);

  578.         h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0);

  579.         vec_st(p1, -2*stride, pix);

  580.         vec_st(p0, -1*stride, pix);

  581.         vec_st(q0, 0, pix);

  582.         vec_st(q1, stride, pix);

  583.     }

  584. }

  585. 

  586. static void h264_h_loop_filter_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {

  587. 

  588.     register vec_u8 line0, line1, line2, line3, line4, line5;

  589.     if ((tc0[0] & tc0[1] & tc0[2] & tc0[3]) < 0)

  590.         return;

  591.     readAndTranspose16x6(pix-3, stride, line0, line1, line2, line3, line4, line5);

  592.     h264_loop_filter_luma_altivec(line0, line1, line2, line3, line4, line5, alpha, beta, tc0);

  593.     transpose4x16(line1, line2, line3, line4);

  594.     write16x4(pix-2, stride, line1, line2, line3, line4);

  595. }

  596. 

  597. static av_always_inline

  598. void weight_h264_W_altivec(uint8_t *block, int stride, int height,

  599.                            int log2_denom, int weight, int offset, int w)

  600. {

  601.     int y, aligned;

  602.     vec_u8 vblock;

  603.     vec_s16 vtemp, vweight, voffset, v0, v1;

  604.     vec_u16 vlog2_denom;

  605.     DECLARE_ALIGNED(16, int32_t, temp)[4];

  606.     LOAD_ZERO;

  607. 

  608.     offset <<= log2_denom;

  609.     if(log2_denom) offset += 1<<(log2_denom-1);

  610.     temp[0] = log2_denom;

  611.     temp[1] = weight;

  612.     temp[2] = offset;

  613. 

  614.     vtemp = (vec_s16)vec_ld(0, temp);

  615.     vlog2_denom = (vec_u16)vec_splat(vtemp, 1);

  616.     vweight = vec_splat(vtemp, 3);

  617.     voffset = vec_splat(vtemp, 5);

  618.     aligned = !((unsigned long)block & 0xf);

  619. 

  620.     for (y = 0; y < height; y++) {

  621.         vblock = vec_ld(0, block);

  622. 

  623.         v0 = (vec_s16)vec_mergeh(zero_u8v, vblock);

  624.         v1 = (vec_s16)vec_mergel(zero_u8v, vblock);

  625. 

  626.         if (w == 16 || aligned) {

  627.             v0 = vec_mladd(v0, vweight, zero_s16v);

  628.             v0 = vec_adds(v0, voffset);

  629.             v0 = vec_sra(v0, vlog2_denom);

  630.         }

  631.         if (w == 16 || !aligned) {

  632.             v1 = vec_mladd(v1, vweight, zero_s16v);

  633.             v1 = vec_adds(v1, voffset);

  634.             v1 = vec_sra(v1, vlog2_denom);

  635.         }

  636.         vblock = vec_packsu(v0, v1);

  637.         vec_st(vblock, 0, block);

  638. 

  639.         block += stride;

  640.     }

  641. }

  642. 

  643. static av_always_inline

  644. void biweight_h264_W_altivec(uint8_t *dst, uint8_t *src, int stride, int height,

  645.                              int log2_denom, int weightd, int weights, int offset, int w)

  646. {

  647.     int y, dst_aligned, src_aligned;

  648.     vec_u8 vsrc, vdst;

  649.     vec_s16 vtemp, vweights, vweightd, voffset, v0, v1, v2, v3;

  650.     vec_u16 vlog2_denom;

  651.     DECLARE_ALIGNED(16, int32_t, temp)[4];

  652.     LOAD_ZERO;

  653. 

  654.     offset = ((offset + 1) | 1) << log2_denom;

  655.     temp[0] = log2_denom+1;

  656.     temp[1] = weights;

  657.     temp[2] = weightd;

  658.     temp[3] = offset;

  659. 

  660.     vtemp = (vec_s16)vec_ld(0, temp);

  661.     vlog2_denom = (vec_u16)vec_splat(vtemp, 1);

  662.     vweights = vec_splat(vtemp, 3);

  663.     vweightd = vec_splat(vtemp, 5);

  664.     voffset = vec_splat(vtemp, 7);

  665.     dst_aligned = !((unsigned long)dst & 0xf);

  666.     src_aligned = !((unsigned long)src & 0xf);

  667. 

  668.     for (y = 0; y < height; y++) {

  669.         vdst = vec_ld(0, dst);

  670.         vsrc = vec_ld(0, src);

  671. 

  672.         v0 = (vec_s16)vec_mergeh(zero_u8v, vdst);

  673.         v1 = (vec_s16)vec_mergel(zero_u8v, vdst);

  674.         v2 = (vec_s16)vec_mergeh(zero_u8v, vsrc);

  675.         v3 = (vec_s16)vec_mergel(zero_u8v, vsrc);

  676. 

  677.         if (w == 8) {

  678.             if (src_aligned)

  679.                 v3 = v2;

  680.             else

  681.                 v2 = v3;

  682.         }

  683. 

  684.         if (w == 16 || dst_aligned) {

  685.             v0 = vec_mladd(v0, vweightd, zero_s16v);

  686.             v2 = vec_mladd(v2, vweights, zero_s16v);

  687. 

  688.             v0 = vec_adds(v0, voffset);

  689.             v0 = vec_adds(v0, v2);

  690.             v0 = vec_sra(v0, vlog2_denom);

  691.         }

  692.         if (w == 16 || !dst_aligned) {

  693.             v1 = vec_mladd(v1, vweightd, zero_s16v);

  694.             v3 = vec_mladd(v3, vweights, zero_s16v);

  695. 

  696.             v1 = vec_adds(v1, voffset);

  697.             v1 = vec_adds(v1, v3);

  698.             v1 = vec_sra(v1, vlog2_denom);

  699.         }

  700.         vdst = vec_packsu(v0, v1);

  701.         vec_st(vdst, 0, dst);

  702. 

  703.         dst += stride;

  704.         src += stride;

  705.     }

  706. }

  707. 

  708. #define H264_WEIGHT(W) \

  709. static void ff_weight_h264_pixels ## W ## _altivec(uint8_t *block, int stride, int height, \

  710.                                                    int log2_denom, int weight, int offset){ \

  711.     weight_h264_W_altivec(block, stride, height, log2_denom, weight, offset, W); \

  712. }\

  713. static void ff_biweight_h264_pixels ## W ## _altivec(uint8_t *dst, uint8_t *src, int stride, int height, \

  714.                                                      int log2_denom, int weightd, int weights, int offset){ \

  715.     biweight_h264_W_altivec(dst, src, stride, height, log2_denom, weightd, weights, offset, W); \

  716. }

  717. 

  718. H264_WEIGHT(16)

  719. H264_WEIGHT( 8)

  720. 

  721. void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)

  722. {

  723.     if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) {

  724.     if (bit_depth == 8) {

  725.         c->h264_idct_add = ff_h264_idct_add_altivec;

  726.         if (chroma_format_idc == 1)

  727.             c->h264_idct_add8 = ff_h264_idct_add8_altivec;

  728.         c->h264_idct_add16 = ff_h264_idct_add16_altivec;

  729.         c->h264_idct_add16intra = ff_h264_idct_add16intra_altivec;

  730.         c->h264_idct_dc_add= h264_idct_dc_add_altivec;

  731.         c->h264_idct8_dc_add = ff_h264_idct8_dc_add_altivec;

  732.         c->h264_idct8_add = ff_h264_idct8_add_altivec;

  733.         c->h264_idct8_add4 = ff_h264_idct8_add4_altivec;

  734.         c->h264_v_loop_filter_luma= h264_v_loop_filter_luma_altivec;

  735.         c->h264_h_loop_filter_luma= h264_h_loop_filter_luma_altivec;

  736. 

  737.         c->weight_h264_pixels_tab[0] = ff_weight_h264_pixels16_altivec;

  738.         c->weight_h264_pixels_tab[1] = ff_weight_h264_pixels8_altivec;

  739.         c->biweight_h264_pixels_tab[0] = ff_biweight_h264_pixels16_altivec;

  740.         c->biweight_h264_pixels_tab[1] = ff_biweight_h264_pixels8_altivec;

  741.     }

  742.     }

  743. }