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h264dsp.c
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1 /*
2  * Copyright (c) 2004 Romain Dolbeau <romain@dolbeau.org>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #include "libavutil/attributes.h"
23 #include "libavutil/cpu.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/ppc/cpu.h"
26 #include "libavutil/ppc/types_altivec.h"
27 #include "libavutil/ppc/util_altivec.h"
28 #include "libavcodec/h264data.h"
29 #include "libavcodec/h264dsp.h"
30 
31 #if HAVE_ALTIVEC
32 
33 /****************************************************************************
34  * IDCT transform:
35  ****************************************************************************/
36 
37 #define VEC_1D_DCT(vb0,vb1,vb2,vb3,va0,va1,va2,va3) \
38  /* 1st stage */ \
39  vz0 = vec_add(vb0,vb2); /* temp[0] = Y[0] + Y[2] */ \
40  vz1 = vec_sub(vb0,vb2); /* temp[1] = Y[0] - Y[2] */ \
41  vz2 = vec_sra(vb1,vec_splat_u16(1)); \
42  vz2 = vec_sub(vz2,vb3); /* temp[2] = Y[1].1/2 - Y[3] */ \
43  vz3 = vec_sra(vb3,vec_splat_u16(1)); \
44  vz3 = vec_add(vb1,vz3); /* temp[3] = Y[1] + Y[3].1/2 */ \
45  /* 2nd stage: output */ \
46  va0 = vec_add(vz0,vz3); /* x[0] = temp[0] + temp[3] */ \
47  va1 = vec_add(vz1,vz2); /* x[1] = temp[1] + temp[2] */ \
48  va2 = vec_sub(vz1,vz2); /* x[2] = temp[1] - temp[2] */ \
49  va3 = vec_sub(vz0,vz3) /* x[3] = temp[0] - temp[3] */
50 
51 #define VEC_TRANSPOSE_4(a0,a1,a2,a3,b0,b1,b2,b3) \
52  b0 = vec_mergeh( a0, a0 ); \
53  b1 = vec_mergeh( a1, a0 ); \
54  b2 = vec_mergeh( a2, a0 ); \
55  b3 = vec_mergeh( a3, a0 ); \
56  a0 = vec_mergeh( b0, b2 ); \
57  a1 = vec_mergel( b0, b2 ); \
58  a2 = vec_mergeh( b1, b3 ); \
59  a3 = vec_mergel( b1, b3 ); \
60  b0 = vec_mergeh( a0, a2 ); \
61  b1 = vec_mergel( a0, a2 ); \
62  b2 = vec_mergeh( a1, a3 ); \
63  b3 = vec_mergel( a1, a3 )
64 
65 #define VEC_LOAD_U8_ADD_S16_STORE_U8(va) \
66  vdst_orig = vec_ld(0, dst); \
67  vdst = vec_perm(vdst_orig, zero_u8v, vdst_mask); \
68  vdst_ss = (vec_s16) vec_mergeh(zero_u8v, vdst); \
69  va = vec_add(va, vdst_ss); \
70  va_u8 = vec_packsu(va, zero_s16v); \
71  va_u32 = vec_splat((vec_u32)va_u8, 0); \
72  vec_ste(va_u32, element, (uint32_t*)dst);
73 
74 static void h264_idct_add_altivec(uint8_t *dst, int16_t *block, int stride)
75 {
76  vec_s16 va0, va1, va2, va3;
77  vec_s16 vz0, vz1, vz2, vz3;
78  vec_s16 vtmp0, vtmp1, vtmp2, vtmp3;
79  vec_u8 va_u8;
80  vec_u32 va_u32;
81  vec_s16 vdst_ss;
82  const vec_u16 v6us = vec_splat_u16(6);
83  vec_u8 vdst, vdst_orig;
84  vec_u8 vdst_mask = vec_lvsl(0, dst);
85  int element = ((unsigned long)dst & 0xf) >> 2;
86  LOAD_ZERO;
87 
88  block[0] += 32; /* add 32 as a DC-level for rounding */
89 
90  vtmp0 = vec_ld(0,block);
91  vtmp1 = vec_sld(vtmp0, vtmp0, 8);
92  vtmp2 = vec_ld(16,block);
93  vtmp3 = vec_sld(vtmp2, vtmp2, 8);
94  memset(block, 0, 16 * sizeof(int16_t));
95 
96  VEC_1D_DCT(vtmp0,vtmp1,vtmp2,vtmp3,va0,va1,va2,va3);
97  VEC_TRANSPOSE_4(va0,va1,va2,va3,vtmp0,vtmp1,vtmp2,vtmp3);
98  VEC_1D_DCT(vtmp0,vtmp1,vtmp2,vtmp3,va0,va1,va2,va3);
99 
100  va0 = vec_sra(va0,v6us);
101  va1 = vec_sra(va1,v6us);
102  va2 = vec_sra(va2,v6us);
103  va3 = vec_sra(va3,v6us);
104 
105  VEC_LOAD_U8_ADD_S16_STORE_U8(va0);
106  dst += stride;
107  VEC_LOAD_U8_ADD_S16_STORE_U8(va1);
108  dst += stride;
109  VEC_LOAD_U8_ADD_S16_STORE_U8(va2);
110  dst += stride;
111  VEC_LOAD_U8_ADD_S16_STORE_U8(va3);
112 }
113 
114 #define IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7, d0, d1, d2, d3, d4, d5, d6, d7) {\
115  /* a0 = SRC(0) + SRC(4); */ \
116  vec_s16 a0v = vec_add(s0, s4); \
117  /* a2 = SRC(0) - SRC(4); */ \
118  vec_s16 a2v = vec_sub(s0, s4); \
119  /* a4 = (SRC(2)>>1) - SRC(6); */ \
120  vec_s16 a4v = vec_sub(vec_sra(s2, onev), s6); \
121  /* a6 = (SRC(6)>>1) + SRC(2); */ \
122  vec_s16 a6v = vec_add(vec_sra(s6, onev), s2); \
123  /* b0 = a0 + a6; */ \
124  vec_s16 b0v = vec_add(a0v, a6v); \
125  /* b2 = a2 + a4; */ \
126  vec_s16 b2v = vec_add(a2v, a4v); \
127  /* b4 = a2 - a4; */ \
128  vec_s16 b4v = vec_sub(a2v, a4v); \
129  /* b6 = a0 - a6; */ \
130  vec_s16 b6v = vec_sub(a0v, a6v); \
131  /* a1 = SRC(5) - SRC(3) - SRC(7) - (SRC(7)>>1); */ \
132  /* a1 = (SRC(5)-SRC(3)) - (SRC(7) + (SRC(7)>>1)); */ \
133  vec_s16 a1v = vec_sub( vec_sub(s5, s3), vec_add(s7, vec_sra(s7, onev)) ); \
134  /* a3 = SRC(7) + SRC(1) - SRC(3) - (SRC(3)>>1); */ \
135  /* a3 = (SRC(7)+SRC(1)) - (SRC(3) + (SRC(3)>>1)); */ \
136  vec_s16 a3v = vec_sub( vec_add(s7, s1), vec_add(s3, vec_sra(s3, onev)) );\
137  /* a5 = SRC(7) - SRC(1) + SRC(5) + (SRC(5)>>1); */ \
138  /* a5 = (SRC(7)-SRC(1)) + SRC(5) + (SRC(5)>>1); */ \
139  vec_s16 a5v = vec_add( vec_sub(s7, s1), vec_add(s5, vec_sra(s5, onev)) );\
140  /* a7 = SRC(5)+SRC(3) + SRC(1) + (SRC(1)>>1); */ \
141  vec_s16 a7v = vec_add( vec_add(s5, s3), vec_add(s1, vec_sra(s1, onev)) );\
142  /* b1 = (a7>>2) + a1; */ \
143  vec_s16 b1v = vec_add( vec_sra(a7v, twov), a1v); \
144  /* b3 = a3 + (a5>>2); */ \
145  vec_s16 b3v = vec_add(a3v, vec_sra(a5v, twov)); \
146  /* b5 = (a3>>2) - a5; */ \
147  vec_s16 b5v = vec_sub( vec_sra(a3v, twov), a5v); \
148  /* b7 = a7 - (a1>>2); */ \
149  vec_s16 b7v = vec_sub( a7v, vec_sra(a1v, twov)); \
150  /* DST(0, b0 + b7); */ \
151  d0 = vec_add(b0v, b7v); \
152  /* DST(1, b2 + b5); */ \
153  d1 = vec_add(b2v, b5v); \
154  /* DST(2, b4 + b3); */ \
155  d2 = vec_add(b4v, b3v); \
156  /* DST(3, b6 + b1); */ \
157  d3 = vec_add(b6v, b1v); \
158  /* DST(4, b6 - b1); */ \
159  d4 = vec_sub(b6v, b1v); \
160  /* DST(5, b4 - b3); */ \
161  d5 = vec_sub(b4v, b3v); \
162  /* DST(6, b2 - b5); */ \
163  d6 = vec_sub(b2v, b5v); \
164  /* DST(7, b0 - b7); */ \
165  d7 = vec_sub(b0v, b7v); \
166 }
167 
168 #define ALTIVEC_STORE_SUM_CLIP(dest, idctv, perm_ldv, perm_stv, sel) { \
169  /* unaligned load */ \
170  vec_u8 hv = vec_ld( 0, dest ); \
171  vec_u8 lv = vec_ld( 7, dest ); \
172  vec_u8 dstv = vec_perm( hv, lv, (vec_u8)perm_ldv ); \
173  vec_s16 idct_sh6 = vec_sra(idctv, sixv); \
174  vec_u16 dst16 = (vec_u16)vec_mergeh(zero_u8v, dstv); \
175  vec_s16 idstsum = vec_adds(idct_sh6, (vec_s16)dst16); \
176  vec_u8 idstsum8 = vec_packsu(zero_s16v, idstsum); \
177  vec_u8 edgehv; \
178  /* unaligned store */ \
179  vec_u8 bodyv = vec_perm( idstsum8, idstsum8, perm_stv );\
180  vec_u8 edgelv = vec_perm( sel, zero_u8v, perm_stv ); \
181  lv = vec_sel( lv, bodyv, edgelv ); \
182  vec_st( lv, 7, dest ); \
183  hv = vec_ld( 0, dest ); \
184  edgehv = vec_perm( zero_u8v, sel, perm_stv ); \
185  hv = vec_sel( hv, bodyv, edgehv ); \
186  vec_st( hv, 0, dest ); \
187  }
188 
189 static void h264_idct8_add_altivec(uint8_t *dst, int16_t *dct, int stride)
190 {
191  vec_s16 s0, s1, s2, s3, s4, s5, s6, s7;
192  vec_s16 d0, d1, d2, d3, d4, d5, d6, d7;
193  vec_s16 idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7;
194 
195  vec_u8 perm_ldv = vec_lvsl(0, dst);
196  vec_u8 perm_stv = vec_lvsr(8, dst);
197 
198  const vec_u16 onev = vec_splat_u16(1);
199  const vec_u16 twov = vec_splat_u16(2);
200  const vec_u16 sixv = vec_splat_u16(6);
201 
202  const vec_u8 sel = (vec_u8) {0,0,0,0,0,0,0,0,-1,-1,-1,-1,-1,-1,-1,-1};
203  LOAD_ZERO;
204 
205  dct[0] += 32; // rounding for the >>6 at the end
206 
207  s0 = vec_ld(0x00, (int16_t*)dct);
208  s1 = vec_ld(0x10, (int16_t*)dct);
209  s2 = vec_ld(0x20, (int16_t*)dct);
210  s3 = vec_ld(0x30, (int16_t*)dct);
211  s4 = vec_ld(0x40, (int16_t*)dct);
212  s5 = vec_ld(0x50, (int16_t*)dct);
213  s6 = vec_ld(0x60, (int16_t*)dct);
214  s7 = vec_ld(0x70, (int16_t*)dct);
215  memset(dct, 0, 64 * sizeof(int16_t));
216 
217  IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7,
218  d0, d1, d2, d3, d4, d5, d6, d7);
219 
220  TRANSPOSE8( d0, d1, d2, d3, d4, d5, d6, d7 );
221 
222  IDCT8_1D_ALTIVEC(d0, d1, d2, d3, d4, d5, d6, d7,
223  idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7);
224 
225  ALTIVEC_STORE_SUM_CLIP(&dst[0*stride], idct0, perm_ldv, perm_stv, sel);
226  ALTIVEC_STORE_SUM_CLIP(&dst[1*stride], idct1, perm_ldv, perm_stv, sel);
227  ALTIVEC_STORE_SUM_CLIP(&dst[2*stride], idct2, perm_ldv, perm_stv, sel);
228  ALTIVEC_STORE_SUM_CLIP(&dst[3*stride], idct3, perm_ldv, perm_stv, sel);
229  ALTIVEC_STORE_SUM_CLIP(&dst[4*stride], idct4, perm_ldv, perm_stv, sel);
230  ALTIVEC_STORE_SUM_CLIP(&dst[5*stride], idct5, perm_ldv, perm_stv, sel);
231  ALTIVEC_STORE_SUM_CLIP(&dst[6*stride], idct6, perm_ldv, perm_stv, sel);
232  ALTIVEC_STORE_SUM_CLIP(&dst[7*stride], idct7, perm_ldv, perm_stv, sel);
233 }
234 
235 static av_always_inline void h264_idct_dc_add_internal(uint8_t *dst, int16_t *block, int stride, int size)
236 {
237  vec_s16 dc16;
238  vec_u8 dcplus, dcminus, v0, v1, v2, v3, aligner;
239  LOAD_ZERO;
240  DECLARE_ALIGNED(16, int, dc);
241  int i;
242 
243  dc = (block[0] + 32) >> 6;
244  block[0] = 0;
245  dc16 = vec_splat((vec_s16) vec_lde(0, &dc), 1);
246 
247  if (size == 4)
248  dc16 = vec_sld(dc16, zero_s16v, 8);
249  dcplus = vec_packsu(dc16, zero_s16v);
250  dcminus = vec_packsu(vec_sub(zero_s16v, dc16), zero_s16v);
251 
252  aligner = vec_lvsr(0, dst);
253  dcplus = vec_perm(dcplus, dcplus, aligner);
254  dcminus = vec_perm(dcminus, dcminus, aligner);
255 
256  for (i = 0; i < size; i += 4) {
257  v0 = vec_ld(0, dst+0*stride);
258  v1 = vec_ld(0, dst+1*stride);
259  v2 = vec_ld(0, dst+2*stride);
260  v3 = vec_ld(0, dst+3*stride);
261 
262  v0 = vec_adds(v0, dcplus);
263  v1 = vec_adds(v1, dcplus);
264  v2 = vec_adds(v2, dcplus);
265  v3 = vec_adds(v3, dcplus);
266 
267  v0 = vec_subs(v0, dcminus);
268  v1 = vec_subs(v1, dcminus);
269  v2 = vec_subs(v2, dcminus);
270  v3 = vec_subs(v3, dcminus);
271 
272  vec_st(v0, 0, dst+0*stride);
273  vec_st(v1, 0, dst+1*stride);
274  vec_st(v2, 0, dst+2*stride);
275  vec_st(v3, 0, dst+3*stride);
276 
277  dst += 4*stride;
278  }
279 }
280 
281 static void h264_idct_dc_add_altivec(uint8_t *dst, int16_t *block, int stride)
282 {
283  h264_idct_dc_add_internal(dst, block, stride, 4);
284 }
285 
286 static void h264_idct8_dc_add_altivec(uint8_t *dst, int16_t *block, int stride)
287 {
288  h264_idct_dc_add_internal(dst, block, stride, 8);
289 }
290 
291 static void h264_idct_add16_altivec(uint8_t *dst, const int *block_offset,
292  int16_t *block, int stride,
293  const uint8_t nnzc[15 * 8])
294 {
295  int i;
296  for(i=0; i<16; i++){
297  int nnz = nnzc[ scan8[i] ];
298  if(nnz){
299  if(nnz==1 && block[i*16]) h264_idct_dc_add_altivec(dst + block_offset[i], block + i*16, stride);
300  else h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);
301  }
302  }
303 }
304 
305 static void h264_idct_add16intra_altivec(uint8_t *dst, const int *block_offset,
306  int16_t *block, int stride,
307  const uint8_t nnzc[15 * 8])
308 {
309  int i;
310  for(i=0; i<16; i++){
311  if(nnzc[ scan8[i] ]) h264_idct_add_altivec(dst + block_offset[i], block + i*16, stride);
312  else if(block[i*16]) h264_idct_dc_add_altivec(dst + block_offset[i], block + i*16, stride);
313  }
314 }
315 
316 static void h264_idct8_add4_altivec(uint8_t *dst, const int *block_offset,
317  int16_t *block, int stride,
318  const uint8_t nnzc[15 * 8])
319 {
320  int i;
321  for(i=0; i<16; i+=4){
322  int nnz = nnzc[ scan8[i] ];
323  if(nnz){
324  if(nnz==1 && block[i*16]) h264_idct8_dc_add_altivec(dst + block_offset[i], block + i*16, stride);
325  else h264_idct8_add_altivec(dst + block_offset[i], block + i*16, stride);
326  }
327  }
328 }
329 
330 static void h264_idct_add8_altivec(uint8_t **dest, const int *block_offset,
331  int16_t *block, int stride,
332  const uint8_t nnzc[15 * 8])
333 {
334  int i, j;
335  for (j = 1; j < 3; j++) {
336  for(i = j * 16; i < j * 16 + 4; i++){
337  if(nnzc[ scan8[i] ])
338  h264_idct_add_altivec(dest[j-1] + block_offset[i], block + i*16, stride);
339  else if(block[i*16])
340  h264_idct_dc_add_altivec(dest[j-1] + block_offset[i], block + i*16, stride);
341  }
342  }
343 }
344 
345 #define transpose4x16(r0, r1, r2, r3) { \
346  register vec_u8 r4; \
347  register vec_u8 r5; \
348  register vec_u8 r6; \
349  register vec_u8 r7; \
350  \
351  r4 = vec_mergeh(r0, r2); /*0, 2 set 0*/ \
352  r5 = vec_mergel(r0, r2); /*0, 2 set 1*/ \
353  r6 = vec_mergeh(r1, r3); /*1, 3 set 0*/ \
354  r7 = vec_mergel(r1, r3); /*1, 3 set 1*/ \
355  \
356  r0 = vec_mergeh(r4, r6); /*all set 0*/ \
357  r1 = vec_mergel(r4, r6); /*all set 1*/ \
358  r2 = vec_mergeh(r5, r7); /*all set 2*/ \
359  r3 = vec_mergel(r5, r7); /*all set 3*/ \
360 }
361 
362 static inline void write16x4(uint8_t *dst, int dst_stride,
363  register vec_u8 r0, register vec_u8 r1,
364  register vec_u8 r2, register vec_u8 r3) {
365  DECLARE_ALIGNED(16, unsigned char, result)[64];
366  uint32_t *src_int = (uint32_t *)result, *dst_int = (uint32_t *)dst;
367  int int_dst_stride = dst_stride/4;
368 
369  vec_st(r0, 0, result);
370  vec_st(r1, 16, result);
371  vec_st(r2, 32, result);
372  vec_st(r3, 48, result);
373  /* FIXME: there has to be a better way!!!! */
374  *dst_int = *src_int;
375  *(dst_int+ int_dst_stride) = *(src_int + 1);
376  *(dst_int+ 2*int_dst_stride) = *(src_int + 2);
377  *(dst_int+ 3*int_dst_stride) = *(src_int + 3);
378  *(dst_int+ 4*int_dst_stride) = *(src_int + 4);
379  *(dst_int+ 5*int_dst_stride) = *(src_int + 5);
380  *(dst_int+ 6*int_dst_stride) = *(src_int + 6);
381  *(dst_int+ 7*int_dst_stride) = *(src_int + 7);
382  *(dst_int+ 8*int_dst_stride) = *(src_int + 8);
383  *(dst_int+ 9*int_dst_stride) = *(src_int + 9);
384  *(dst_int+10*int_dst_stride) = *(src_int + 10);
385  *(dst_int+11*int_dst_stride) = *(src_int + 11);
386  *(dst_int+12*int_dst_stride) = *(src_int + 12);
387  *(dst_int+13*int_dst_stride) = *(src_int + 13);
388  *(dst_int+14*int_dst_stride) = *(src_int + 14);
389  *(dst_int+15*int_dst_stride) = *(src_int + 15);
390 }
391 
392 /** @brief performs a 6x16 transpose of data in src, and stores it to dst
393  @todo FIXME: see if we can't spare some vec_lvsl() by them factorizing
394  out of unaligned_load() */
395 #define readAndTranspose16x6(src, src_stride, r8, r9, r10, r11, r12, r13) {\
396  register vec_u8 r0 = unaligned_load(0, src); \
397  register vec_u8 r1 = unaligned_load( src_stride, src); \
398  register vec_u8 r2 = unaligned_load(2* src_stride, src); \
399  register vec_u8 r3 = unaligned_load(3* src_stride, src); \
400  register vec_u8 r4 = unaligned_load(4* src_stride, src); \
401  register vec_u8 r5 = unaligned_load(5* src_stride, src); \
402  register vec_u8 r6 = unaligned_load(6* src_stride, src); \
403  register vec_u8 r7 = unaligned_load(7* src_stride, src); \
404  register vec_u8 r14 = unaligned_load(14*src_stride, src); \
405  register vec_u8 r15 = unaligned_load(15*src_stride, src); \
406  \
407  r8 = unaligned_load( 8*src_stride, src); \
408  r9 = unaligned_load( 9*src_stride, src); \
409  r10 = unaligned_load(10*src_stride, src); \
410  r11 = unaligned_load(11*src_stride, src); \
411  r12 = unaligned_load(12*src_stride, src); \
412  r13 = unaligned_load(13*src_stride, src); \
413  \
414  /*Merge first pairs*/ \
415  r0 = vec_mergeh(r0, r8); /*0, 8*/ \
416  r1 = vec_mergeh(r1, r9); /*1, 9*/ \
417  r2 = vec_mergeh(r2, r10); /*2,10*/ \
418  r3 = vec_mergeh(r3, r11); /*3,11*/ \
419  r4 = vec_mergeh(r4, r12); /*4,12*/ \
420  r5 = vec_mergeh(r5, r13); /*5,13*/ \
421  r6 = vec_mergeh(r6, r14); /*6,14*/ \
422  r7 = vec_mergeh(r7, r15); /*7,15*/ \
423  \
424  /*Merge second pairs*/ \
425  r8 = vec_mergeh(r0, r4); /*0,4, 8,12 set 0*/ \
426  r9 = vec_mergel(r0, r4); /*0,4, 8,12 set 1*/ \
427  r10 = vec_mergeh(r1, r5); /*1,5, 9,13 set 0*/ \
428  r11 = vec_mergel(r1, r5); /*1,5, 9,13 set 1*/ \
429  r12 = vec_mergeh(r2, r6); /*2,6,10,14 set 0*/ \
430  r13 = vec_mergel(r2, r6); /*2,6,10,14 set 1*/ \
431  r14 = vec_mergeh(r3, r7); /*3,7,11,15 set 0*/ \
432  r15 = vec_mergel(r3, r7); /*3,7,11,15 set 1*/ \
433  \
434  /*Third merge*/ \
435  r0 = vec_mergeh(r8, r12); /*0,2,4,6,8,10,12,14 set 0*/ \
436  r1 = vec_mergel(r8, r12); /*0,2,4,6,8,10,12,14 set 1*/ \
437  r2 = vec_mergeh(r9, r13); /*0,2,4,6,8,10,12,14 set 2*/ \
438  r4 = vec_mergeh(r10, r14); /*1,3,5,7,9,11,13,15 set 0*/ \
439  r5 = vec_mergel(r10, r14); /*1,3,5,7,9,11,13,15 set 1*/ \
440  r6 = vec_mergeh(r11, r15); /*1,3,5,7,9,11,13,15 set 2*/ \
441  /* Don't need to compute 3 and 7*/ \
442  \
443  /*Final merge*/ \
444  r8 = vec_mergeh(r0, r4); /*all set 0*/ \
445  r9 = vec_mergel(r0, r4); /*all set 1*/ \
446  r10 = vec_mergeh(r1, r5); /*all set 2*/ \
447  r11 = vec_mergel(r1, r5); /*all set 3*/ \
448  r12 = vec_mergeh(r2, r6); /*all set 4*/ \
449  r13 = vec_mergel(r2, r6); /*all set 5*/ \
450  /* Don't need to compute 14 and 15*/ \
451  \
452 }
453 
454 // out: o = |x-y| < a
455 static inline vec_u8 diff_lt_altivec ( register vec_u8 x,
456  register vec_u8 y,
457  register vec_u8 a) {
458 
459  register vec_u8 diff = vec_subs(x, y);
460  register vec_u8 diffneg = vec_subs(y, x);
461  register vec_u8 o = vec_or(diff, diffneg); /* |x-y| */
462  o = (vec_u8)vec_cmplt(o, a);
463  return o;
464 }
465 
466 static inline vec_u8 h264_deblock_mask ( register vec_u8 p0,
467  register vec_u8 p1,
468  register vec_u8 q0,
469  register vec_u8 q1,
470  register vec_u8 alpha,
471  register vec_u8 beta) {
472 
473  register vec_u8 mask;
474  register vec_u8 tempmask;
475 
476  mask = diff_lt_altivec(p0, q0, alpha);
477  tempmask = diff_lt_altivec(p1, p0, beta);
478  mask = vec_and(mask, tempmask);
479  tempmask = diff_lt_altivec(q1, q0, beta);
480  mask = vec_and(mask, tempmask);
481 
482  return mask;
483 }
484 
485 // out: newp1 = clip((p2 + ((p0 + q0 + 1) >> 1)) >> 1, p1-tc0, p1+tc0)
486 static inline vec_u8 h264_deblock_q1(register vec_u8 p0,
487  register vec_u8 p1,
488  register vec_u8 p2,
489  register vec_u8 q0,
490  register vec_u8 tc0) {
491 
492  register vec_u8 average = vec_avg(p0, q0);
493  register vec_u8 temp;
494  register vec_u8 uncliped;
495  register vec_u8 ones;
496  register vec_u8 max;
497  register vec_u8 min;
498  register vec_u8 newp1;
499 
500  temp = vec_xor(average, p2);
501  average = vec_avg(average, p2); /*avg(p2, avg(p0, q0)) */
502  ones = vec_splat_u8(1);
503  temp = vec_and(temp, ones); /*(p2^avg(p0, q0)) & 1 */
504  uncliped = vec_subs(average, temp); /*(p2+((p0+q0+1)>>1))>>1 */
505  max = vec_adds(p1, tc0);
506  min = vec_subs(p1, tc0);
507  newp1 = vec_max(min, uncliped);
508  newp1 = vec_min(max, newp1);
509  return newp1;
510 }
511 
512 #define h264_deblock_p0_q0(p0, p1, q0, q1, tc0masked) { \
513  \
514  const vec_u8 A0v = vec_sl(vec_splat_u8(10), vec_splat_u8(4)); \
515  \
516  register vec_u8 pq0bit = vec_xor(p0,q0); \
517  register vec_u8 q1minus; \
518  register vec_u8 p0minus; \
519  register vec_u8 stage1; \
520  register vec_u8 stage2; \
521  register vec_u8 vec160; \
522  register vec_u8 delta; \
523  register vec_u8 deltaneg; \
524  \
525  q1minus = vec_nor(q1, q1); /* 255 - q1 */ \
526  stage1 = vec_avg(p1, q1minus); /* (p1 - q1 + 256)>>1 */ \
527  stage2 = vec_sr(stage1, vec_splat_u8(1)); /* (p1 - q1 + 256)>>2 = 64 + (p1 - q1) >> 2 */ \
528  p0minus = vec_nor(p0, p0); /* 255 - p0 */ \
529  stage1 = vec_avg(q0, p0minus); /* (q0 - p0 + 256)>>1 */ \
530  pq0bit = vec_and(pq0bit, vec_splat_u8(1)); \
531  stage2 = vec_avg(stage2, pq0bit); /* 32 + ((q0 - p0)&1 + (p1 - q1) >> 2 + 1) >> 1 */ \
532  stage2 = vec_adds(stage2, stage1); /* 160 + ((p0 - q0) + (p1 - q1) >> 2 + 1) >> 1 */ \
533  vec160 = vec_ld(0, &A0v); \
534  deltaneg = vec_subs(vec160, stage2); /* -d */ \
535  delta = vec_subs(stage2, vec160); /* d */ \
536  deltaneg = vec_min(tc0masked, deltaneg); \
537  delta = vec_min(tc0masked, delta); \
538  p0 = vec_subs(p0, deltaneg); \
539  q0 = vec_subs(q0, delta); \
540  p0 = vec_adds(p0, delta); \
541  q0 = vec_adds(q0, deltaneg); \
542 }
543 
544 #define h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0) { \
545  DECLARE_ALIGNED(16, unsigned char, temp)[16]; \
546  register vec_u8 alphavec; \
547  register vec_u8 betavec; \
548  register vec_u8 mask; \
549  register vec_u8 p1mask; \
550  register vec_u8 q1mask; \
551  register vector signed char tc0vec; \
552  register vec_u8 finaltc0; \
553  register vec_u8 tc0masked; \
554  register vec_u8 newp1; \
555  register vec_u8 newq1; \
556  \
557  temp[0] = alpha; \
558  temp[1] = beta; \
559  alphavec = vec_ld(0, temp); \
560  betavec = vec_splat(alphavec, 0x1); \
561  alphavec = vec_splat(alphavec, 0x0); \
562  mask = h264_deblock_mask(p0, p1, q0, q1, alphavec, betavec); /*if in block */ \
563  \
564  AV_COPY32(temp, tc0); \
565  tc0vec = vec_ld(0, (signed char*)temp); \
566  tc0vec = vec_mergeh(tc0vec, tc0vec); \
567  tc0vec = vec_mergeh(tc0vec, tc0vec); \
568  mask = vec_and(mask, vec_cmpgt(tc0vec, vec_splat_s8(-1))); /* if tc0[i] >= 0 */ \
569  finaltc0 = vec_and((vec_u8)tc0vec, mask); /* tc = tc0 */ \
570  \
571  p1mask = diff_lt_altivec(p2, p0, betavec); \
572  p1mask = vec_and(p1mask, mask); /* if ( |p2 - p0| < beta) */ \
573  tc0masked = vec_and(p1mask, (vec_u8)tc0vec); \
574  finaltc0 = vec_sub(finaltc0, p1mask); /* tc++ */ \
575  newp1 = h264_deblock_q1(p0, p1, p2, q0, tc0masked); \
576  /*end if*/ \
577  \
578  q1mask = diff_lt_altivec(q2, q0, betavec); \
579  q1mask = vec_and(q1mask, mask); /* if ( |q2 - q0| < beta ) */\
580  tc0masked = vec_and(q1mask, (vec_u8)tc0vec); \
581  finaltc0 = vec_sub(finaltc0, q1mask); /* tc++ */ \
582  newq1 = h264_deblock_q1(p0, q1, q2, q0, tc0masked); \
583  /*end if*/ \
584  \
585  h264_deblock_p0_q0(p0, p1, q0, q1, finaltc0); \
586  p1 = newp1; \
587  q1 = newq1; \
588 }
589 
590 static void h264_v_loop_filter_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {
591 
592  if ((tc0[0] & tc0[1] & tc0[2] & tc0[3]) >= 0) {
593  register vec_u8 p2 = vec_ld(-3*stride, pix);
594  register vec_u8 p1 = vec_ld(-2*stride, pix);
595  register vec_u8 p0 = vec_ld(-1*stride, pix);
596  register vec_u8 q0 = vec_ld(0, pix);
597  register vec_u8 q1 = vec_ld(stride, pix);
598  register vec_u8 q2 = vec_ld(2*stride, pix);
599  h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0);
600  vec_st(p1, -2*stride, pix);
601  vec_st(p0, -1*stride, pix);
602  vec_st(q0, 0, pix);
603  vec_st(q1, stride, pix);
604  }
605 }
606 
607 static void h264_h_loop_filter_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {
608 
609  register vec_u8 line0, line1, line2, line3, line4, line5;
610  if ((tc0[0] & tc0[1] & tc0[2] & tc0[3]) < 0)
611  return;
612  readAndTranspose16x6(pix-3, stride, line0, line1, line2, line3, line4, line5);
613  h264_loop_filter_luma_altivec(line0, line1, line2, line3, line4, line5, alpha, beta, tc0);
614  transpose4x16(line1, line2, line3, line4);
615  write16x4(pix-2, stride, line1, line2, line3, line4);
616 }
617 
618 static av_always_inline
619 void weight_h264_W_altivec(uint8_t *block, int stride, int height,
620  int log2_denom, int weight, int offset, int w)
621 {
622  int y, aligned;
623  vec_u8 vblock;
624  vec_s16 vtemp, vweight, voffset, v0, v1;
625  vec_u16 vlog2_denom;
626  DECLARE_ALIGNED(16, int32_t, temp)[4];
627  LOAD_ZERO;
628 
629  offset <<= log2_denom;
630  if(log2_denom) offset += 1<<(log2_denom-1);
631  temp[0] = log2_denom;
632  temp[1] = weight;
633  temp[2] = offset;
634 
635  vtemp = (vec_s16)vec_ld(0, temp);
636  vlog2_denom = (vec_u16)vec_splat(vtemp, 1);
637  vweight = vec_splat(vtemp, 3);
638  voffset = vec_splat(vtemp, 5);
639  aligned = !((unsigned long)block & 0xf);
640 
641  for (y = 0; y < height; y++) {
642  vblock = vec_ld(0, block);
643 
644  v0 = (vec_s16)vec_mergeh(zero_u8v, vblock);
645  v1 = (vec_s16)vec_mergel(zero_u8v, vblock);
646 
647  if (w == 16 || aligned) {
648  v0 = vec_mladd(v0, vweight, zero_s16v);
649  v0 = vec_adds(v0, voffset);
650  v0 = vec_sra(v0, vlog2_denom);
651  }
652  if (w == 16 || !aligned) {
653  v1 = vec_mladd(v1, vweight, zero_s16v);
654  v1 = vec_adds(v1, voffset);
655  v1 = vec_sra(v1, vlog2_denom);
656  }
657  vblock = vec_packsu(v0, v1);
658  vec_st(vblock, 0, block);
659 
660  block += stride;
661  }
662 }
663 
664 static av_always_inline
665 void biweight_h264_W_altivec(uint8_t *dst, uint8_t *src, int stride, int height,
666  int log2_denom, int weightd, int weights, int offset, int w)
667 {
668  int y, dst_aligned, src_aligned;
669  vec_u8 vsrc, vdst;
670  vec_s16 vtemp, vweights, vweightd, voffset, v0, v1, v2, v3;
671  vec_u16 vlog2_denom;
672  DECLARE_ALIGNED(16, int32_t, temp)[4];
673  LOAD_ZERO;
674 
675  offset = ((offset + 1) | 1) << log2_denom;
676  temp[0] = log2_denom+1;
677  temp[1] = weights;
678  temp[2] = weightd;
679  temp[3] = offset;
680 
681  vtemp = (vec_s16)vec_ld(0, temp);
682  vlog2_denom = (vec_u16)vec_splat(vtemp, 1);
683  vweights = vec_splat(vtemp, 3);
684  vweightd = vec_splat(vtemp, 5);
685  voffset = vec_splat(vtemp, 7);
686  dst_aligned = !((unsigned long)dst & 0xf);
687  src_aligned = !((unsigned long)src & 0xf);
688 
689  for (y = 0; y < height; y++) {
690  vdst = vec_ld(0, dst);
691  vsrc = vec_ld(0, src);
692 
693  v0 = (vec_s16)vec_mergeh(zero_u8v, vdst);
694  v1 = (vec_s16)vec_mergel(zero_u8v, vdst);
695  v2 = (vec_s16)vec_mergeh(zero_u8v, vsrc);
696  v3 = (vec_s16)vec_mergel(zero_u8v, vsrc);
697 
698  if (w == 8) {
699  if (src_aligned)
700  v3 = v2;
701  else
702  v2 = v3;
703  }
704 
705  if (w == 16 || dst_aligned) {
706  v0 = vec_mladd(v0, vweightd, zero_s16v);
707  v2 = vec_mladd(v2, vweights, zero_s16v);
708 
709  v0 = vec_adds(v0, voffset);
710  v0 = vec_adds(v0, v2);
711  v0 = vec_sra(v0, vlog2_denom);
712  }
713  if (w == 16 || !dst_aligned) {
714  v1 = vec_mladd(v1, vweightd, zero_s16v);
715  v3 = vec_mladd(v3, vweights, zero_s16v);
716 
717  v1 = vec_adds(v1, voffset);
718  v1 = vec_adds(v1, v3);
719  v1 = vec_sra(v1, vlog2_denom);
720  }
721  vdst = vec_packsu(v0, v1);
722  vec_st(vdst, 0, dst);
723 
724  dst += stride;
725  src += stride;
726  }
727 }
728 
729 #define H264_WEIGHT(W) \
730 static void weight_h264_pixels ## W ## _altivec(uint8_t *block, int stride, int height, \
731  int log2_denom, int weight, int offset) \
732 { \
733  weight_h264_W_altivec(block, stride, height, log2_denom, weight, offset, W); \
734 }\
735 static void biweight_h264_pixels ## W ## _altivec(uint8_t *dst, uint8_t *src, int stride, int height, \
736  int log2_denom, int weightd, int weights, int offset) \
737 { \
738  biweight_h264_W_altivec(dst, src, stride, height, log2_denom, weightd, weights, offset, W); \
739 }
740 
741 H264_WEIGHT(16)
742 H264_WEIGHT( 8)
743 #endif /* HAVE_ALTIVEC */
744 
745 av_cold void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,
746  const int chroma_format_idc)
747 {
748 #if HAVE_ALTIVEC
749  if (!PPC_ALTIVEC(av_get_cpu_flags()))
750  return;
751 
752  if (bit_depth == 8) {
753  c->h264_idct_add = h264_idct_add_altivec;
754  if (chroma_format_idc <= 1)
755  c->h264_idct_add8 = h264_idct_add8_altivec;
756  c->h264_idct_add16 = h264_idct_add16_altivec;
757  c->h264_idct_add16intra = h264_idct_add16intra_altivec;
758  c->h264_idct_dc_add= h264_idct_dc_add_altivec;
759  c->h264_idct8_dc_add = h264_idct8_dc_add_altivec;
760  c->h264_idct8_add = h264_idct8_add_altivec;
761  c->h264_idct8_add4 = h264_idct8_add4_altivec;
762  c->h264_v_loop_filter_luma= h264_v_loop_filter_luma_altivec;
763  c->h264_h_loop_filter_luma= h264_h_loop_filter_luma_altivec;
764 
765  c->weight_h264_pixels_tab[0] = weight_h264_pixels16_altivec;
766  c->weight_h264_pixels_tab[1] = weight_h264_pixels8_altivec;
767  c->biweight_h264_pixels_tab[0] = biweight_h264_pixels16_altivec;
768  c->biweight_h264_pixels_tab[1] = biweight_h264_pixels8_altivec;
769  }
770 #endif /* HAVE_ALTIVEC */
771 }
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