2 * Copyright (c) 2002 Dieter Shirley
4 * dct_unquantize_h263_altivec:
5 * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "mpegvideo.h"
29 #include "gcc_fixes.h"
31 #include "dsputil_ppc.h"
32 #include "util_altivec.h"
33 // Swaps two variables (used for altivec registers)
36 __typeof__(a) swap_temp=a; \
41 // transposes a matrix consisting of four vectors with four elements each
42 #define TRANSPOSE4(a,b,c,d) \
44 __typeof__(a) _trans_ach = vec_mergeh(a, c); \
45 __typeof__(a) _trans_acl = vec_mergel(a, c); \
46 __typeof__(a) _trans_bdh = vec_mergeh(b, d); \
47 __typeof__(a) _trans_bdl = vec_mergel(b, d); \
49 a = vec_mergeh(_trans_ach, _trans_bdh); \
50 b = vec_mergel(_trans_ach, _trans_bdh); \
51 c = vec_mergeh(_trans_acl, _trans_bdl); \
52 d = vec_mergel(_trans_acl, _trans_bdl); \
56 // Loads a four-byte value (int or float) from the target address
57 // into every element in the target vector. Only works if the
58 // target address is four-byte aligned (which should be always).
59 #define LOAD4(vec, address) \
61 __typeof__(vec)* _load_addr = (__typeof__(vec)*)(address); \
62 vector unsigned char _perm_vec = vec_lvsl(0,(address)); \
63 vec = vec_ld(0, _load_addr); \
64 vec = vec_perm(vec, vec, _perm_vec); \
65 vec = vec_splat(vec, 0); \
72 // slower, for dumb non-apple GCC
73 #define FOUROF(a) {a,a,a,a}
75 int dct_quantize_altivec(MpegEncContext* s,
77 int qscale, int* overflow)
80 vector float row0, row1, row2, row3, row4, row5, row6, row7;
81 vector float alt0, alt1, alt2, alt3, alt4, alt5, alt6, alt7;
82 const vector float zero = (const vector float)FOUROF(0.);
83 // used after quantize step
86 // Load the data into the row/alt vectors
88 vector signed short data0, data1, data2, data3, data4, data5, data6, data7;
90 data0 = vec_ld(0, data);
91 data1 = vec_ld(16, data);
92 data2 = vec_ld(32, data);
93 data3 = vec_ld(48, data);
94 data4 = vec_ld(64, data);
95 data5 = vec_ld(80, data);
96 data6 = vec_ld(96, data);
97 data7 = vec_ld(112, data);
99 // Transpose the data before we start
100 TRANSPOSE8(data0, data1, data2, data3, data4, data5, data6, data7);
102 // load the data into floating point vectors. We load
103 // the high half of each row into the main row vectors
104 // and the low half into the alt vectors.
105 row0 = vec_ctf(vec_unpackh(data0), 0);
106 alt0 = vec_ctf(vec_unpackl(data0), 0);
107 row1 = vec_ctf(vec_unpackh(data1), 0);
108 alt1 = vec_ctf(vec_unpackl(data1), 0);
109 row2 = vec_ctf(vec_unpackh(data2), 0);
110 alt2 = vec_ctf(vec_unpackl(data2), 0);
111 row3 = vec_ctf(vec_unpackh(data3), 0);
112 alt3 = vec_ctf(vec_unpackl(data3), 0);
113 row4 = vec_ctf(vec_unpackh(data4), 0);
114 alt4 = vec_ctf(vec_unpackl(data4), 0);
115 row5 = vec_ctf(vec_unpackh(data5), 0);
116 alt5 = vec_ctf(vec_unpackl(data5), 0);
117 row6 = vec_ctf(vec_unpackh(data6), 0);
118 alt6 = vec_ctf(vec_unpackl(data6), 0);
119 row7 = vec_ctf(vec_unpackh(data7), 0);
120 alt7 = vec_ctf(vec_unpackl(data7), 0);
123 // The following block could exist as a separate an altivec dct
124 // function. However, if we put it inline, the DCT data can remain
125 // in the vector local variables, as floats, which we'll use during the
128 const vector float vec_0_298631336 = (vector float)FOUROF(0.298631336f);
129 const vector float vec_0_390180644 = (vector float)FOUROF(-0.390180644f);
130 const vector float vec_0_541196100 = (vector float)FOUROF(0.541196100f);
131 const vector float vec_0_765366865 = (vector float)FOUROF(0.765366865f);
132 const vector float vec_0_899976223 = (vector float)FOUROF(-0.899976223f);
133 const vector float vec_1_175875602 = (vector float)FOUROF(1.175875602f);
134 const vector float vec_1_501321110 = (vector float)FOUROF(1.501321110f);
135 const vector float vec_1_847759065 = (vector float)FOUROF(-1.847759065f);
136 const vector float vec_1_961570560 = (vector float)FOUROF(-1.961570560f);
137 const vector float vec_2_053119869 = (vector float)FOUROF(2.053119869f);
138 const vector float vec_2_562915447 = (vector float)FOUROF(-2.562915447f);
139 const vector float vec_3_072711026 = (vector float)FOUROF(3.072711026f);
142 int whichPass, whichHalf;
144 for(whichPass = 1; whichPass<=2; whichPass++)
146 for(whichHalf = 1; whichHalf<=2; whichHalf++)
148 vector float tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
149 vector float tmp10, tmp11, tmp12, tmp13;
150 vector float z1, z2, z3, z4, z5;
152 tmp0 = vec_add(row0, row7); // tmp0 = dataptr[0] + dataptr[7];
153 tmp7 = vec_sub(row0, row7); // tmp7 = dataptr[0] - dataptr[7];
154 tmp3 = vec_add(row3, row4); // tmp3 = dataptr[3] + dataptr[4];
155 tmp4 = vec_sub(row3, row4); // tmp4 = dataptr[3] - dataptr[4];
156 tmp1 = vec_add(row1, row6); // tmp1 = dataptr[1] + dataptr[6];
157 tmp6 = vec_sub(row1, row6); // tmp6 = dataptr[1] - dataptr[6];
158 tmp2 = vec_add(row2, row5); // tmp2 = dataptr[2] + dataptr[5];
159 tmp5 = vec_sub(row2, row5); // tmp5 = dataptr[2] - dataptr[5];
161 tmp10 = vec_add(tmp0, tmp3); // tmp10 = tmp0 + tmp3;
162 tmp13 = vec_sub(tmp0, tmp3); // tmp13 = tmp0 - tmp3;
163 tmp11 = vec_add(tmp1, tmp2); // tmp11 = tmp1 + tmp2;
164 tmp12 = vec_sub(tmp1, tmp2); // tmp12 = tmp1 - tmp2;
167 // dataptr[0] = (DCTELEM) ((tmp10 + tmp11) << PASS1_BITS);
168 row0 = vec_add(tmp10, tmp11);
170 // dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS);
171 row4 = vec_sub(tmp10, tmp11);
174 // z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
175 z1 = vec_madd(vec_add(tmp12, tmp13), vec_0_541196100, (vector float)zero);
177 // dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
178 // CONST_BITS-PASS1_BITS);
179 row2 = vec_madd(tmp13, vec_0_765366865, z1);
181 // dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
182 // CONST_BITS-PASS1_BITS);
183 row6 = vec_madd(tmp12, vec_1_847759065, z1);
185 z1 = vec_add(tmp4, tmp7); // z1 = tmp4 + tmp7;
186 z2 = vec_add(tmp5, tmp6); // z2 = tmp5 + tmp6;
187 z3 = vec_add(tmp4, tmp6); // z3 = tmp4 + tmp6;
188 z4 = vec_add(tmp5, tmp7); // z4 = tmp5 + tmp7;
190 // z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
191 z5 = vec_madd(vec_add(z3, z4), vec_1_175875602, (vector float)zero);
193 // z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
194 z3 = vec_madd(z3, vec_1_961570560, z5);
196 // z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
197 z4 = vec_madd(z4, vec_0_390180644, z5);
199 // The following adds are rolled into the multiplies above
200 // z3 = vec_add(z3, z5); // z3 += z5;
201 // z4 = vec_add(z4, z5); // z4 += z5;
203 // z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
204 // Wow! It's actually more effecient to roll this multiply
205 // into the adds below, even thought the multiply gets done twice!
206 // z2 = vec_madd(z2, vec_2_562915447, (vector float)zero);
208 // z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
209 // Same with this one...
210 // z1 = vec_madd(z1, vec_0_899976223, (vector float)zero);
212 // tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
213 // dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS);
214 row7 = vec_madd(tmp4, vec_0_298631336, vec_madd(z1, vec_0_899976223, z3));
216 // tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
217 // dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS);
218 row5 = vec_madd(tmp5, vec_2_053119869, vec_madd(z2, vec_2_562915447, z4));
220 // tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
221 // dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS);
222 row3 = vec_madd(tmp6, vec_3_072711026, vec_madd(z2, vec_2_562915447, z3));
224 // tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
225 // dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS);
226 row1 = vec_madd(z1, vec_0_899976223, vec_madd(tmp7, vec_1_501321110, z4));
228 // Swap the row values with the alts. If this is the first half,
229 // this sets up the low values to be acted on in the second half.
230 // If this is the second half, it puts the high values back in
231 // the row values where they are expected to be when we're done.
244 // transpose the data for the second pass
246 // First, block transpose the upper right with lower left.
252 // Now, transpose each block of four
253 TRANSPOSE4(row0, row1, row2, row3);
254 TRANSPOSE4(row4, row5, row6, row7);
255 TRANSPOSE4(alt0, alt1, alt2, alt3);
256 TRANSPOSE4(alt4, alt5, alt6, alt7);
261 // perform the quantize step, using the floating point data
262 // still in the row/alt registers
265 const vector signed int* qmat;
266 vector float bias, negBias;
270 vector signed int baseVector;
272 // We must cache element 0 in the intra case
273 // (it needs special handling).
274 baseVector = vec_cts(vec_splat(row0, 0), 0);
275 vec_ste(baseVector, 0, &oldBaseValue);
277 qmat = (vector signed int*)s->q_intra_matrix[qscale];
278 biasAddr = &(s->intra_quant_bias);
282 qmat = (vector signed int*)s->q_inter_matrix[qscale];
283 biasAddr = &(s->inter_quant_bias);
286 // Load the bias vector (We add 0.5 to the bias so that we're
287 // rounding when we convert to int, instead of flooring.)
289 vector signed int biasInt;
290 const vector float negOneFloat = (vector float)FOUROF(-1.0f);
291 LOAD4(biasInt, biasAddr);
292 bias = vec_ctf(biasInt, QUANT_BIAS_SHIFT);
293 negBias = vec_madd(bias, negOneFloat, zero);
297 vector float q0, q1, q2, q3, q4, q5, q6, q7;
299 q0 = vec_ctf(qmat[0], QMAT_SHIFT);
300 q1 = vec_ctf(qmat[2], QMAT_SHIFT);
301 q2 = vec_ctf(qmat[4], QMAT_SHIFT);
302 q3 = vec_ctf(qmat[6], QMAT_SHIFT);
303 q4 = vec_ctf(qmat[8], QMAT_SHIFT);
304 q5 = vec_ctf(qmat[10], QMAT_SHIFT);
305 q6 = vec_ctf(qmat[12], QMAT_SHIFT);
306 q7 = vec_ctf(qmat[14], QMAT_SHIFT);
308 row0 = vec_sel(vec_madd(row0, q0, negBias), vec_madd(row0, q0, bias),
309 vec_cmpgt(row0, zero));
310 row1 = vec_sel(vec_madd(row1, q1, negBias), vec_madd(row1, q1, bias),
311 vec_cmpgt(row1, zero));
312 row2 = vec_sel(vec_madd(row2, q2, negBias), vec_madd(row2, q2, bias),
313 vec_cmpgt(row2, zero));
314 row3 = vec_sel(vec_madd(row3, q3, negBias), vec_madd(row3, q3, bias),
315 vec_cmpgt(row3, zero));
316 row4 = vec_sel(vec_madd(row4, q4, negBias), vec_madd(row4, q4, bias),
317 vec_cmpgt(row4, zero));
318 row5 = vec_sel(vec_madd(row5, q5, negBias), vec_madd(row5, q5, bias),
319 vec_cmpgt(row5, zero));
320 row6 = vec_sel(vec_madd(row6, q6, negBias), vec_madd(row6, q6, bias),
321 vec_cmpgt(row6, zero));
322 row7 = vec_sel(vec_madd(row7, q7, negBias), vec_madd(row7, q7, bias),
323 vec_cmpgt(row7, zero));
325 q0 = vec_ctf(qmat[1], QMAT_SHIFT);
326 q1 = vec_ctf(qmat[3], QMAT_SHIFT);
327 q2 = vec_ctf(qmat[5], QMAT_SHIFT);
328 q3 = vec_ctf(qmat[7], QMAT_SHIFT);
329 q4 = vec_ctf(qmat[9], QMAT_SHIFT);
330 q5 = vec_ctf(qmat[11], QMAT_SHIFT);
331 q6 = vec_ctf(qmat[13], QMAT_SHIFT);
332 q7 = vec_ctf(qmat[15], QMAT_SHIFT);
334 alt0 = vec_sel(vec_madd(alt0, q0, negBias), vec_madd(alt0, q0, bias),
335 vec_cmpgt(alt0, zero));
336 alt1 = vec_sel(vec_madd(alt1, q1, negBias), vec_madd(alt1, q1, bias),
337 vec_cmpgt(alt1, zero));
338 alt2 = vec_sel(vec_madd(alt2, q2, negBias), vec_madd(alt2, q2, bias),
339 vec_cmpgt(alt2, zero));
340 alt3 = vec_sel(vec_madd(alt3, q3, negBias), vec_madd(alt3, q3, bias),
341 vec_cmpgt(alt3, zero));
342 alt4 = vec_sel(vec_madd(alt4, q4, negBias), vec_madd(alt4, q4, bias),
343 vec_cmpgt(alt4, zero));
344 alt5 = vec_sel(vec_madd(alt5, q5, negBias), vec_madd(alt5, q5, bias),
345 vec_cmpgt(alt5, zero));
346 alt6 = vec_sel(vec_madd(alt6, q6, negBias), vec_madd(alt6, q6, bias),
347 vec_cmpgt(alt6, zero));
348 alt7 = vec_sel(vec_madd(alt7, q7, negBias), vec_madd(alt7, q7, bias),
349 vec_cmpgt(alt7, zero));
355 // Store the data back into the original block
357 vector signed short data0, data1, data2, data3, data4, data5, data6, data7;
359 data0 = vec_pack(vec_cts(row0, 0), vec_cts(alt0, 0));
360 data1 = vec_pack(vec_cts(row1, 0), vec_cts(alt1, 0));
361 data2 = vec_pack(vec_cts(row2, 0), vec_cts(alt2, 0));
362 data3 = vec_pack(vec_cts(row3, 0), vec_cts(alt3, 0));
363 data4 = vec_pack(vec_cts(row4, 0), vec_cts(alt4, 0));
364 data5 = vec_pack(vec_cts(row5, 0), vec_cts(alt5, 0));
365 data6 = vec_pack(vec_cts(row6, 0), vec_cts(alt6, 0));
366 data7 = vec_pack(vec_cts(row7, 0), vec_cts(alt7, 0));
369 // Clamp for overflow
370 vector signed int max_q_int, min_q_int;
371 vector signed short max_q, min_q;
373 LOAD4(max_q_int, &(s->max_qcoeff));
374 LOAD4(min_q_int, &(s->min_qcoeff));
376 max_q = vec_pack(max_q_int, max_q_int);
377 min_q = vec_pack(min_q_int, min_q_int);
379 data0 = vec_max(vec_min(data0, max_q), min_q);
380 data1 = vec_max(vec_min(data1, max_q), min_q);
381 data2 = vec_max(vec_min(data2, max_q), min_q);
382 data4 = vec_max(vec_min(data4, max_q), min_q);
383 data5 = vec_max(vec_min(data5, max_q), min_q);
384 data6 = vec_max(vec_min(data6, max_q), min_q);
385 data7 = vec_max(vec_min(data7, max_q), min_q);
389 vector bool char zero_01, zero_23, zero_45, zero_67;
390 vector signed char scanIndices_01, scanIndices_23, scanIndices_45, scanIndices_67;
391 vector signed char negOne = vec_splat_s8(-1);
392 vector signed char* scanPtr =
393 (vector signed char*)(s->intra_scantable.inverse);
394 signed char lastNonZeroChar;
396 // Determine the largest non-zero index.
397 zero_01 = vec_pack(vec_cmpeq(data0, (vector signed short)zero),
398 vec_cmpeq(data1, (vector signed short)zero));
399 zero_23 = vec_pack(vec_cmpeq(data2, (vector signed short)zero),
400 vec_cmpeq(data3, (vector signed short)zero));
401 zero_45 = vec_pack(vec_cmpeq(data4, (vector signed short)zero),
402 vec_cmpeq(data5, (vector signed short)zero));
403 zero_67 = vec_pack(vec_cmpeq(data6, (vector signed short)zero),
404 vec_cmpeq(data7, (vector signed short)zero));
407 scanIndices_01 = vec_sel(scanPtr[0], negOne, zero_01);
408 scanIndices_23 = vec_sel(scanPtr[1], negOne, zero_23);
409 scanIndices_45 = vec_sel(scanPtr[2], negOne, zero_45);
410 scanIndices_67 = vec_sel(scanPtr[3], negOne, zero_67);
413 scanIndices_01 = vec_max(scanIndices_01, scanIndices_23);
414 scanIndices_45 = vec_max(scanIndices_45, scanIndices_67);
417 scanIndices_01 = vec_max(scanIndices_01, scanIndices_45);
420 scanIndices_01 = vec_max(vec_mergeh(scanIndices_01, negOne),
421 vec_mergel(scanIndices_01, negOne));
424 scanIndices_01 = vec_max(vec_mergeh(scanIndices_01, negOne),
425 vec_mergel(scanIndices_01, negOne));
428 scanIndices_01 = vec_max(vec_mergeh(scanIndices_01, negOne),
429 vec_mergel(scanIndices_01, negOne));
432 scanIndices_01 = vec_max(vec_mergeh(scanIndices_01, negOne),
433 vec_mergel(scanIndices_01, negOne));
435 scanIndices_01 = vec_splat(scanIndices_01, 0);
438 vec_ste(scanIndices_01, 0, &lastNonZeroChar);
440 lastNonZero = lastNonZeroChar;
442 // While the data is still in vectors we check for the transpose IDCT permute
443 // and handle it using the vector unit if we can. This is the permute used
444 // by the altivec idct, so it is common when using the altivec dct.
446 if ((lastNonZero > 0) && (s->dsp.idct_permutation_type == FF_TRANSPOSE_IDCT_PERM))
448 TRANSPOSE8(data0, data1, data2, data3, data4, data5, data6, data7);
451 vec_st(data0, 0, data);
452 vec_st(data1, 16, data);
453 vec_st(data2, 32, data);
454 vec_st(data3, 48, data);
455 vec_st(data4, 64, data);
456 vec_st(data5, 80, data);
457 vec_st(data6, 96, data);
458 vec_st(data7, 112, data);
462 // special handling of block[0]
468 oldBaseValue /= s->y_dc_scale;
470 oldBaseValue /= s->c_dc_scale;
473 // Divide by 8, rounding the result
474 data[0] = (oldBaseValue + 4) >> 3;
477 // We handled the transpose permutation above and we don't
478 // need to permute the "no" permutation case.
479 if ((lastNonZero > 0) &&
480 (s->dsp.idct_permutation_type != FF_TRANSPOSE_IDCT_PERM) &&
481 (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM))
483 ff_block_permute(data, s->dsp.idct_permutation,
484 s->intra_scantable.scantable, lastNonZero);
492 AltiVec version of dct_unquantize_h263
493 this code assumes `block' is 16 bytes-aligned
495 void dct_unquantize_h263_altivec(MpegEncContext *s,
496 DCTELEM *block, int n, int qscale)
498 POWERPC_PERF_DECLARE(altivec_dct_unquantize_h263_num, 1);
499 int i, level, qmul, qadd;
502 assert(s->block_last_index[n]>=0);
504 POWERPC_PERF_START_COUNT(altivec_dct_unquantize_h263_num, 1);
506 qadd = (qscale - 1) | 1;
512 block[0] = block[0] * s->y_dc_scale;
514 block[0] = block[0] * s->c_dc_scale;
518 nCoeffs= 63; //does not always use zigzag table
521 nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
525 register const vector signed short vczero = (const vector signed short)vec_splat_s16(0);
526 DECLARE_ALIGNED_16(short, qmul8[]) =
528 qmul, qmul, qmul, qmul,
529 qmul, qmul, qmul, qmul
531 DECLARE_ALIGNED_16(short, qadd8[]) =
533 qadd, qadd, qadd, qadd,
534 qadd, qadd, qadd, qadd
536 DECLARE_ALIGNED_16(short, nqadd8[]) =
538 -qadd, -qadd, -qadd, -qadd,
539 -qadd, -qadd, -qadd, -qadd
541 register vector signed short blockv, qmulv, qaddv, nqaddv, temp1;
542 register vector bool short blockv_null, blockv_neg;
543 register short backup_0 = block[0];
546 qmulv = vec_ld(0, qmul8);
547 qaddv = vec_ld(0, qadd8);
548 nqaddv = vec_ld(0, nqadd8);
550 #if 0 // block *is* 16 bytes-aligned, it seems.
551 // first make sure block[j] is 16 bytes-aligned
552 for(j = 0; (j <= nCoeffs) && ((((unsigned long)block) + (j << 1)) & 0x0000000F) ; j++) {
556 level = level * qmul - qadd;
558 level = level * qmul + qadd;
565 // vectorize all the 16 bytes-aligned blocks
567 for(; (j + 7) <= nCoeffs ; j+=8)
569 blockv = vec_ld(j << 1, block);
570 blockv_neg = vec_cmplt(blockv, vczero);
571 blockv_null = vec_cmpeq(blockv, vczero);
572 // choose between +qadd or -qadd as the third operand
573 temp1 = vec_sel(qaddv, nqaddv, blockv_neg);
574 // multiply & add (block{i,i+7} * qmul [+-] qadd)
575 temp1 = vec_mladd(blockv, qmulv, temp1);
576 // put 0 where block[{i,i+7} used to have 0
577 blockv = vec_sel(temp1, blockv, blockv_null);
578 vec_st(blockv, j << 1, block);
581 // if nCoeffs isn't a multiple of 8, finish the job
582 // using good old scalar units.
583 // (we could do it using a truncated vector,
584 // but I'm not sure it's worth the hassle)
585 for(; j <= nCoeffs ; j++) {
589 level = level * qmul - qadd;
591 level = level * qmul + qadd;
598 { // cheat. this avoid special-casing the first iteration
602 POWERPC_PERF_STOP_COUNT(altivec_dct_unquantize_h263_num, nCoeffs == 63);
606 extern void idct_put_altivec(uint8_t *dest, int line_size, int16_t *block);
607 extern void idct_add_altivec(uint8_t *dest, int line_size, int16_t *block);
609 void MPV_common_init_altivec(MpegEncContext *s)
611 if (s->avctx->lowres==0)
613 if ((s->avctx->idct_algo == FF_IDCT_AUTO) ||
614 (s->avctx->idct_algo == FF_IDCT_ALTIVEC))
616 s->dsp.idct_put = idct_put_altivec;
617 s->dsp.idct_add = idct_add_altivec;
618 s->dsp.idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;
622 // Test to make sure that the dct required alignments are met.
623 if ((((long)(s->q_intra_matrix) & 0x0f) != 0) ||
624 (((long)(s->q_inter_matrix) & 0x0f) != 0))
626 av_log(s->avctx, AV_LOG_INFO, "Internal Error: q-matrix blocks must be 16-byte aligned "
627 "to use AltiVec DCT. Reverting to non-AltiVec version.\n");
631 if (((long)(s->intra_scantable.inverse) & 0x0f) != 0)
633 av_log(s->avctx, AV_LOG_INFO, "Internal Error: scan table blocks must be 16-byte aligned "
634 "to use AltiVec DCT. Reverting to non-AltiVec version.\n");
639 if ((s->avctx->dct_algo == FF_DCT_AUTO) ||
640 (s->avctx->dct_algo == FF_DCT_ALTIVEC))
642 #if 0 /* seems to cause trouble under some circumstances */
643 s->dct_quantize = dct_quantize_altivec;
645 s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;
646 s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;