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FFmpeg/libavcodec/ppc/h264dsp.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 "config.h"

  22. 

  23. #include <stdint.h>

  24. #include <string.h>

  25. 

  26. #include "libavutil/attributes.h"

  27. #include "libavutil/cpu.h"

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/mem.h"

  30. #include "libavutil/ppc/cpu.h"

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

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

  33. 

  34. #include "libavcodec/h264dec.h"

  35. #include "libavcodec/h264dsp.h"

  36. 

  37. #if HAVE_ALTIVEC && HAVE_BIGENDIAN

  38. 

  39. /****************************************************************************

  40.  * IDCT transform:

  41.  ****************************************************************************/

  42. 

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

  44.     /* 1st stage */                                               \

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

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

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

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

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

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

  51.     /* 2nd stage: output */                                       \

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

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

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

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

  56. 

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

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

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

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

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

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

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

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

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

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

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

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

  69.     b3 = vec_mergel( a1, a3 )

  70. 

  71. #define VEC_LOAD_U8_ADD_S16_STORE_U8(va)                      \

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

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

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

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

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

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

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

  79. 

  80. static void h264_idct_add_altivec(uint8_t *dst, int16_t *block, int stride)

  81. {

  82.     vec_s16 va0, va1, va2, va3;

  83.     vec_s16 vz0, vz1, vz2, vz3;

  84.     vec_s16 vtmp0, vtmp1, vtmp2, vtmp3;

  85.     vec_u8 va_u8;

  86.     vec_u32 va_u32;

  87.     vec_s16 vdst_ss;

  88.     const vec_u16 v6us = vec_splat_u16(6);

  89.     vec_u8 vdst, vdst_orig;

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

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

  92.     LOAD_ZERO;

  93. 

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

  95. 

  96.     vtmp0 = vec_ld(0,block);

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

  98.     vtmp2 = vec_ld(16,block);

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

  100.     memset(block, 0, 16 * sizeof(int16_t));

  101. 

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

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

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

  105. 

  106.     va0 = vec_sra(va0,v6us);

  107.     va1 = vec_sra(va1,v6us);

  108.     va2 = vec_sra(va2,v6us);

  109.     va3 = vec_sra(va3,v6us);

  110. 

  111.     VEC_LOAD_U8_ADD_S16_STORE_U8(va0);

  112.     dst += stride;

  113.     VEC_LOAD_U8_ADD_S16_STORE_U8(va1);

  114.     dst += stride;

  115.     VEC_LOAD_U8_ADD_S16_STORE_U8(va2);

  116.     dst += stride;

  117.     VEC_LOAD_U8_ADD_S16_STORE_U8(va3);

  118. }

  119. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  172. }

  173. 

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

  175.     /* unaligned load */                                       \

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

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

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

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

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

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

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

  183.     vec_u8 edgehv;                                           \

  184.     /* unaligned store */                                      \

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

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

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

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

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

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

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

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

  193.  }

  194. 

  195. static void h264_idct8_add_altivec(uint8_t *dst, int16_t *dct, int stride)

  196. {

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

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

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

  200. 

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

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

  203. 

  204.     const vec_u16 onev = vec_splat_u16(1);

  205.     const vec_u16 twov = vec_splat_u16(2);

  206.     const vec_u16 sixv = vec_splat_u16(6);

  207. 

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

  209.     LOAD_ZERO;

  210. 

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

  212. 

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

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

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

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

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

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

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

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

  221.     memset(dct, 0, 64 * sizeof(int16_t));

  222. 

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

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

  225. 

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

  227. 

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

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

  230. 

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

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

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

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

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

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

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

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

  239. }

  240. 

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

  242. {

  243.     vec_s16 dc16;

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

  245.     LOAD_ZERO;

  246.     DECLARE_ALIGNED(16, int, dc);

  247.     int i;

  248. 

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

  250.     block[0] = 0;

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

  252. 

  253.     if (size == 4)

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

  255.     dcplus = vec_packsu(dc16, zero_s16v);

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

  257. 

  258.     aligner = vec_lvsr(0, dst);

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

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

  261. 

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

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

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

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

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

  267. 

  268.         v0 = vec_adds(v0, dcplus);

  269.         v1 = vec_adds(v1, dcplus);

  270.         v2 = vec_adds(v2, dcplus);

  271.         v3 = vec_adds(v3, dcplus);

  272. 

  273.         v0 = vec_subs(v0, dcminus);

  274.         v1 = vec_subs(v1, dcminus);

  275.         v2 = vec_subs(v2, dcminus);

  276.         v3 = vec_subs(v3, dcminus);

  277. 

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

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

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

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

  282. 

  283.         dst += 4*stride;

  284.     }

  285. }

  286. 

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

  288. {

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

  290. }

  291. 

  292. static void h264_idct8_dc_add_altivec(uint8_t *dst, int16_t *block, int stride)

  293. {

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

  295. }

  296. 

  297. static void h264_idct_add16_altivec(uint8_t *dst, const int *block_offset,

  298.                                     int16_t *block, int stride,

  299.                                     const uint8_t nnzc[15 * 8])

  300. {

  301.     int i;

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

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

  304.         if(nnz){

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

  306.             else                      h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);

  307.         }

  308.     }

  309. }

  310. 

  311. static void h264_idct_add16intra_altivec(uint8_t *dst, const int *block_offset,

  312.                                          int16_t *block, int stride,

  313.                                          const uint8_t nnzc[15 * 8])

  314. {

  315.     int i;

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

  317.         if(nnzc[ scan8[i] ]) h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);

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

  319.     }

  320. }

  321. 

  322. static void h264_idct8_add4_altivec(uint8_t *dst, const int *block_offset,

  323.                                     int16_t *block, int stride,

  324.                                     const uint8_t nnzc[15 * 8])

  325. {

  326.     int i;

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

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

  329.         if(nnz){

  330.             if(nnz==1 && block[i*16]) h264_idct8_dc_add_altivec(dst + block_offset[i], block + i*16, stride);

  331.             else                      h264_idct8_add_altivec(dst + block_offset[i], block + i*16, stride);

  332.         }

  333.     }

  334. }

  335. 

  336. static void h264_idct_add8_altivec(uint8_t **dest, const int *block_offset,

  337.                                    int16_t *block, int stride,

  338.                                    const uint8_t nnzc[15 * 8])

  339. {

  340.     int i, j;

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

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

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

  344.                 h264_idct_add_altivec(dest[j-1] + block_offset[i], block + i*16, stride);

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

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

  347.         }

  348.     }

  349. }

  350. 

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

  352.     register vec_u8 r4;                    \

  353.     register vec_u8 r5;                    \

  354.     register vec_u8 r6;                    \

  355.     register vec_u8 r7;                    \

  356.                                              \

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

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

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

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

  361.                                              \

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

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

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

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

  366. }

  367. 

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

  369.                              register vec_u8 r0, register vec_u8 r1,

  370.                              register vec_u8 r2, register vec_u8 r3) {

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

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

  373.     int int_dst_stride = dst_stride/4;

  374. 

  375.     vec_st(r0, 0, result);

  376.     vec_st(r1, 16, result);

  377.     vec_st(r2, 32, result);

  378.     vec_st(r3, 48, result);

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

  380.     *dst_int = *src_int;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  396. }

  397. 

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

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

  400.     out of unaligned_load() */

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

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

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

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

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

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

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

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

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

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

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

  412.                                                                            \

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

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

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

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

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

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

  419.                                                                            \

  420.     /*Merge first pairs*/                                                  \

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

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

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

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

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

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

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

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

  429.                                                                            \

  430.     /*Merge second pairs*/                                                 \

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

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

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

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

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

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

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

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

  439.                                                                            \

  440.     /*Third merge*/                                                        \

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

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

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

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

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

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

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

  448.                                                                            \

  449.     /*Final merge*/                                                        \

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

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

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

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

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

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

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

  457.                                                                            \

  458. }

  459. 

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

  461. static inline vec_u8 diff_lt_altivec ( register vec_u8 x,

  462.                                          register vec_u8 y,

  463.                                          register vec_u8 a) {

  464. 

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

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

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

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

  469.     return o;

  470. }

  471. 

  472. static inline vec_u8 h264_deblock_mask ( register vec_u8 p0,

  473.                                            register vec_u8 p1,

  474.                                            register vec_u8 q0,

  475.                                            register vec_u8 q1,

  476.                                            register vec_u8 alpha,

  477.                                            register vec_u8 beta) {

  478. 

  479.     register vec_u8 mask;

  480.     register vec_u8 tempmask;

  481. 

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

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

  484.     mask = vec_and(mask, tempmask);

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

  486.     mask = vec_and(mask, tempmask);

  487. 

  488.     return mask;

  489. }

  490. 

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

  492. static inline vec_u8 h264_deblock_q1(register vec_u8 p0,

  493.                                        register vec_u8 p1,

  494.                                        register vec_u8 p2,

  495.                                        register vec_u8 q0,

  496.                                        register vec_u8 tc0) {

  497. 

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

  499.     register vec_u8 temp;

  500.     register vec_u8 uncliped;

  501.     register vec_u8 ones;

  502.     register vec_u8 max;

  503.     register vec_u8 min;

  504.     register vec_u8 newp1;

  505. 

  506.     temp = vec_xor(average, p2);

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

  508.     ones = vec_splat_u8(1);

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

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

  511.     max = vec_adds(p1, tc0);

  512.     min = vec_subs(p1, tc0);

  513.     newp1 = vec_max(min, uncliped);

  514.     newp1 = vec_min(max, newp1);

  515.     return newp1;

  516. }

  517. 

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

  519.                                                                                                   \

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

  521.                                                                                                   \

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

  523.     register vec_u8 q1minus;                                                                    \

  524.     register vec_u8 p0minus;                                                                    \

  525.     register vec_u8 stage1;                                                                     \

  526.     register vec_u8 stage2;                                                                     \

  527.     register vec_u8 vec160;                                                                     \

  528.     register vec_u8 delta;                                                                      \

  529.     register vec_u8 deltaneg;                                                                   \

  530.                                                                                                   \

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  548. }

  549. 

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

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

  552.     register vec_u8 alphavec;                                                              \

  553.     register vec_u8 betavec;                                                               \

  554.     register vec_u8 mask;                                                                  \

  555.     register vec_u8 p1mask;                                                                \

  556.     register vec_u8 q1mask;                                                                \

  557.     register vector signed   char tc0vec;                                                    \

  558.     register vec_u8 finaltc0;                                                              \

  559.     register vec_u8 tc0masked;                                                             \

  560.     register vec_u8 newp1;                                                                 \

  561.     register vec_u8 newq1;                                                                 \

  562.                                                                                              \

  563.     temp[0] = alpha;                                                                         \

  564.     temp[1] = beta;                                                                          \

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

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

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

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

  569.                                                                                              \

  570.     AV_COPY32(temp, tc0);                                                                    \

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

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

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

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

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

  576.                                                                                              \

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

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

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

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

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

  582.     /*end if*/                                                                               \

  583.                                                                                              \

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

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

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

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

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

  589.     /*end if*/                                                                               \

  590.                                                                                              \

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

  592.     p1 = newp1;                                                                              \

  593.     q1 = newq1;                                                                              \

  594. }

  595. 

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

  597. 

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

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

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

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

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

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

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

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

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

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

  608.         vec_st(q0, 0, pix);

  609.         vec_st(q1, stride, pix);

  610.     }

  611. }

  612. 

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

  614. 

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

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

  617.         return;

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

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

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

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

  622. }

  623. 

  624. static av_always_inline

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

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

  627. {

  628.     int y, aligned;

  629.     vec_u8 vblock;

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

  631.     vec_u16 vlog2_denom;

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

  633.     LOAD_ZERO;

  634. 

  635.     offset <<= log2_denom;

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

  637.     temp[0] = log2_denom;

  638.     temp[1] = weight;

  639.     temp[2] = offset;

  640. 

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

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

  643.     vweight = vec_splat(vtemp, 3);

  644.     voffset = vec_splat(vtemp, 5);

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

  646. 

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

  648.         vblock = vec_ld(0, block);

  649. 

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

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

  652. 

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

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

  655.             v0 = vec_adds(v0, voffset);

  656.             v0 = vec_sra(v0, vlog2_denom);

  657.         }

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

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

  660.             v1 = vec_adds(v1, voffset);

  661.             v1 = vec_sra(v1, vlog2_denom);

  662.         }

  663.         vblock = vec_packsu(v0, v1);

  664.         vec_st(vblock, 0, block);

  665. 

  666.         block += stride;

  667.     }

  668. }

  669. 

  670. static av_always_inline

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

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

  673. {

  674.     int y, dst_aligned, src_aligned;

  675.     vec_u8 vsrc, vdst;

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

  677.     vec_u16 vlog2_denom;

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

  679.     LOAD_ZERO;

  680. 

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

  682.     temp[0] = log2_denom+1;

  683.     temp[1] = weights;

  684.     temp[2] = weightd;

  685.     temp[3] = offset;

  686. 

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

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

  689.     vweights = vec_splat(vtemp, 3);

  690.     vweightd = vec_splat(vtemp, 5);

  691.     voffset = vec_splat(vtemp, 7);

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

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

  694. 

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

  696.         vdst = vec_ld(0, dst);

  697.         vsrc = vec_ld(0, src);

  698. 

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

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

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

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

  703. 

  704.         if (w == 8) {

  705.             if (src_aligned)

  706.                 v3 = v2;

  707.             else

  708.                 v2 = v3;

  709.         }

  710. 

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

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

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

  714. 

  715.             v0 = vec_adds(v0, voffset);

  716.             v0 = vec_adds(v0, v2);

  717.             v0 = vec_sra(v0, vlog2_denom);

  718.         }

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

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

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

  722. 

  723.             v1 = vec_adds(v1, voffset);

  724.             v1 = vec_adds(v1, v3);

  725.             v1 = vec_sra(v1, vlog2_denom);

  726.         }

  727.         vdst = vec_packsu(v0, v1);

  728.         vec_st(vdst, 0, dst);

  729. 

  730.         dst += stride;

  731.         src += stride;

  732.     }

  733. }

  734. 

  735. #define H264_WEIGHT(W) \

  736. static void weight_h264_pixels ## W ## _altivec(uint8_t *block, int stride, int height, \

  737.                                                 int log2_denom, int weight, int offset) \

  738. { \

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

  740. }\

  741. static void biweight_h264_pixels ## W ## _altivec(uint8_t *dst, uint8_t *src, int stride, int height, \

  742.                                                   int log2_denom, int weightd, int weights, int offset) \

  743. { \

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

  745. }

  746. 

  747. H264_WEIGHT(16)

  748. H264_WEIGHT( 8)

  749. #endif /* HAVE_ALTIVEC */

  750. 

  751. av_cold void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,

  752.                                  const int chroma_format_idc)

  753. {

  754. #if HAVE_ALTIVEC && HAVE_BIGENDIAN

  755.     if (!PPC_ALTIVEC(av_get_cpu_flags()))

  756.         return;

  757. 

  758.     if (bit_depth == 8) {

  759.         c->h264_idct_add = h264_idct_add_altivec;

  760.         if (chroma_format_idc <= 1)

  761.             c->h264_idct_add8 = h264_idct_add8_altivec;

  762.         c->h264_idct_add16      = h264_idct_add16_altivec;

  763.         c->h264_idct_add16intra = h264_idct_add16intra_altivec;

  764.         c->h264_idct_dc_add= h264_idct_dc_add_altivec;

  765.         c->h264_idct8_dc_add = h264_idct8_dc_add_altivec;

  766.         c->h264_idct8_add    = h264_idct8_add_altivec;

  767.         c->h264_idct8_add4   = h264_idct8_add4_altivec;

  768.         c->h264_v_loop_filter_luma= h264_v_loop_filter_luma_altivec;

  769.         c->h264_h_loop_filter_luma= h264_h_loop_filter_luma_altivec;

  770. 

  771.         c->weight_h264_pixels_tab[0]   = weight_h264_pixels16_altivec;

  772.         c->weight_h264_pixels_tab[1]   = weight_h264_pixels8_altivec;

  773.         c->biweight_h264_pixels_tab[0] = biweight_h264_pixels16_altivec;

  774.         c->biweight_h264_pixels_tab[1] = biweight_h264_pixels8_altivec;

  775.     }

  776. #endif /* HAVE_ALTIVEC */

  777. }