| /* |
| * Copyright (c) 2002 Dieter Shirley |
| * |
| * dct_unquantize_h263_altivec: |
| * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include "libavcodec/dsputil.h" |
| #include "libavcodec/mpegvideo.h" |
| |
| #include "gcc_fixes.h" |
| |
| #include "dsputil_ppc.h" |
| #include "util_altivec.h" |
| // Swaps two variables (used for altivec registers) |
| #define SWAP(a,b) \ |
| do { \ |
| __typeof__(a) swap_temp=a; \ |
| a=b; \ |
| b=swap_temp; \ |
| } while (0) |
| |
| // transposes a matrix consisting of four vectors with four elements each |
| #define TRANSPOSE4(a,b,c,d) \ |
| do { \ |
| __typeof__(a) _trans_ach = vec_mergeh(a, c); \ |
| __typeof__(a) _trans_acl = vec_mergel(a, c); \ |
| __typeof__(a) _trans_bdh = vec_mergeh(b, d); \ |
| __typeof__(a) _trans_bdl = vec_mergel(b, d); \ |
| \ |
| a = vec_mergeh(_trans_ach, _trans_bdh); \ |
| b = vec_mergel(_trans_ach, _trans_bdh); \ |
| c = vec_mergeh(_trans_acl, _trans_bdl); \ |
| d = vec_mergel(_trans_acl, _trans_bdl); \ |
| } while (0) |
| |
| |
| // Loads a four-byte value (int or float) from the target address |
| // into every element in the target vector. Only works if the |
| // target address is four-byte aligned (which should be always). |
| #define LOAD4(vec, address) \ |
| { \ |
| __typeof__(vec)* _load_addr = (__typeof__(vec)*)(address); \ |
| vector unsigned char _perm_vec = vec_lvsl(0,(address)); \ |
| vec = vec_ld(0, _load_addr); \ |
| vec = vec_perm(vec, vec, _perm_vec); \ |
| vec = vec_splat(vec, 0); \ |
| } |
| |
| |
| #define FOUROF(a) {a,a,a,a} |
| |
| int dct_quantize_altivec(MpegEncContext* s, |
| DCTELEM* data, int n, |
| int qscale, int* overflow) |
| { |
| int lastNonZero; |
| vector float row0, row1, row2, row3, row4, row5, row6, row7; |
| vector float alt0, alt1, alt2, alt3, alt4, alt5, alt6, alt7; |
| const vector float zero = (const vector float)FOUROF(0.); |
| // used after quantize step |
| int oldBaseValue = 0; |
| |
| // Load the data into the row/alt vectors |
| { |
| vector signed short data0, data1, data2, data3, data4, data5, data6, data7; |
| |
| data0 = vec_ld(0, data); |
| data1 = vec_ld(16, data); |
| data2 = vec_ld(32, data); |
| data3 = vec_ld(48, data); |
| data4 = vec_ld(64, data); |
| data5 = vec_ld(80, data); |
| data6 = vec_ld(96, data); |
| data7 = vec_ld(112, data); |
| |
| // Transpose the data before we start |
| TRANSPOSE8(data0, data1, data2, data3, data4, data5, data6, data7); |
| |
| // load the data into floating point vectors. We load |
| // the high half of each row into the main row vectors |
| // and the low half into the alt vectors. |
| row0 = vec_ctf(vec_unpackh(data0), 0); |
| alt0 = vec_ctf(vec_unpackl(data0), 0); |
| row1 = vec_ctf(vec_unpackh(data1), 0); |
| alt1 = vec_ctf(vec_unpackl(data1), 0); |
| row2 = vec_ctf(vec_unpackh(data2), 0); |
| alt2 = vec_ctf(vec_unpackl(data2), 0); |
| row3 = vec_ctf(vec_unpackh(data3), 0); |
| alt3 = vec_ctf(vec_unpackl(data3), 0); |
| row4 = vec_ctf(vec_unpackh(data4), 0); |
| alt4 = vec_ctf(vec_unpackl(data4), 0); |
| row5 = vec_ctf(vec_unpackh(data5), 0); |
| alt5 = vec_ctf(vec_unpackl(data5), 0); |
| row6 = vec_ctf(vec_unpackh(data6), 0); |
| alt6 = vec_ctf(vec_unpackl(data6), 0); |
| row7 = vec_ctf(vec_unpackh(data7), 0); |
| alt7 = vec_ctf(vec_unpackl(data7), 0); |
| } |
| |
| // The following block could exist as a separate an altivec dct |
| // function. However, if we put it inline, the DCT data can remain |
| // in the vector local variables, as floats, which we'll use during the |
| // quantize step... |
| { |
| const vector float vec_0_298631336 = (vector float)FOUROF(0.298631336f); |
| const vector float vec_0_390180644 = (vector float)FOUROF(-0.390180644f); |
| const vector float vec_0_541196100 = (vector float)FOUROF(0.541196100f); |
| const vector float vec_0_765366865 = (vector float)FOUROF(0.765366865f); |
| const vector float vec_0_899976223 = (vector float)FOUROF(-0.899976223f); |
| const vector float vec_1_175875602 = (vector float)FOUROF(1.175875602f); |
| const vector float vec_1_501321110 = (vector float)FOUROF(1.501321110f); |
| const vector float vec_1_847759065 = (vector float)FOUROF(-1.847759065f); |
| const vector float vec_1_961570560 = (vector float)FOUROF(-1.961570560f); |
| const vector float vec_2_053119869 = (vector float)FOUROF(2.053119869f); |
| const vector float vec_2_562915447 = (vector float)FOUROF(-2.562915447f); |
| const vector float vec_3_072711026 = (vector float)FOUROF(3.072711026f); |
| |
| |
| int whichPass, whichHalf; |
| |
| for(whichPass = 1; whichPass<=2; whichPass++) { |
| for(whichHalf = 1; whichHalf<=2; whichHalf++) { |
| vector float tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
| vector float tmp10, tmp11, tmp12, tmp13; |
| vector float z1, z2, z3, z4, z5; |
| |
| tmp0 = vec_add(row0, row7); // tmp0 = dataptr[0] + dataptr[7]; |
| tmp7 = vec_sub(row0, row7); // tmp7 = dataptr[0] - dataptr[7]; |
| tmp3 = vec_add(row3, row4); // tmp3 = dataptr[3] + dataptr[4]; |
| tmp4 = vec_sub(row3, row4); // tmp4 = dataptr[3] - dataptr[4]; |
| tmp1 = vec_add(row1, row6); // tmp1 = dataptr[1] + dataptr[6]; |
| tmp6 = vec_sub(row1, row6); // tmp6 = dataptr[1] - dataptr[6]; |
| tmp2 = vec_add(row2, row5); // tmp2 = dataptr[2] + dataptr[5]; |
| tmp5 = vec_sub(row2, row5); // tmp5 = dataptr[2] - dataptr[5]; |
| |
| tmp10 = vec_add(tmp0, tmp3); // tmp10 = tmp0 + tmp3; |
| tmp13 = vec_sub(tmp0, tmp3); // tmp13 = tmp0 - tmp3; |
| tmp11 = vec_add(tmp1, tmp2); // tmp11 = tmp1 + tmp2; |
| tmp12 = vec_sub(tmp1, tmp2); // tmp12 = tmp1 - tmp2; |
| |
| |
| // dataptr[0] = (DCTELEM) ((tmp10 + tmp11) << PASS1_BITS); |
| row0 = vec_add(tmp10, tmp11); |
| |
| // dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS); |
| row4 = vec_sub(tmp10, tmp11); |
| |
| |
| // z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
| z1 = vec_madd(vec_add(tmp12, tmp13), vec_0_541196100, (vector float)zero); |
| |
| // dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865), |
| // CONST_BITS-PASS1_BITS); |
| row2 = vec_madd(tmp13, vec_0_765366865, z1); |
| |
| // dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065), |
| // CONST_BITS-PASS1_BITS); |
| row6 = vec_madd(tmp12, vec_1_847759065, z1); |
| |
| z1 = vec_add(tmp4, tmp7); // z1 = tmp4 + tmp7; |
| z2 = vec_add(tmp5, tmp6); // z2 = tmp5 + tmp6; |
| z3 = vec_add(tmp4, tmp6); // z3 = tmp4 + tmp6; |
| z4 = vec_add(tmp5, tmp7); // z4 = tmp5 + tmp7; |
| |
| // z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ |
| z5 = vec_madd(vec_add(z3, z4), vec_1_175875602, (vector float)zero); |
| |
| // z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
| z3 = vec_madd(z3, vec_1_961570560, z5); |
| |
| // z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
| z4 = vec_madd(z4, vec_0_390180644, z5); |
| |
| // The following adds are rolled into the multiplies above |
| // z3 = vec_add(z3, z5); // z3 += z5; |
| // z4 = vec_add(z4, z5); // z4 += z5; |
| |
| // z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
| // Wow! It's actually more efficient to roll this multiply |
| // into the adds below, even thought the multiply gets done twice! |
| // z2 = vec_madd(z2, vec_2_562915447, (vector float)zero); |
| |
| // z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
| // Same with this one... |
| // z1 = vec_madd(z1, vec_0_899976223, (vector float)zero); |
| |
| // tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
| // dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS); |
| row7 = vec_madd(tmp4, vec_0_298631336, vec_madd(z1, vec_0_899976223, z3)); |
| |
| // tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
| // dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS); |
| row5 = vec_madd(tmp5, vec_2_053119869, vec_madd(z2, vec_2_562915447, z4)); |
| |
| // tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
| // dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS); |
| row3 = vec_madd(tmp6, vec_3_072711026, vec_madd(z2, vec_2_562915447, z3)); |
| |
| // tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
| // dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS); |
| row1 = vec_madd(z1, vec_0_899976223, vec_madd(tmp7, vec_1_501321110, z4)); |
| |
| // Swap the row values with the alts. If this is the first half, |
| // this sets up the low values to be acted on in the second half. |
| // If this is the second half, it puts the high values back in |
| // the row values where they are expected to be when we're done. |
| SWAP(row0, alt0); |
| SWAP(row1, alt1); |
| SWAP(row2, alt2); |
| SWAP(row3, alt3); |
| SWAP(row4, alt4); |
| SWAP(row5, alt5); |
| SWAP(row6, alt6); |
| SWAP(row7, alt7); |
| } |
| |
| if (whichPass == 1) { |
| // transpose the data for the second pass |
| |
| // First, block transpose the upper right with lower left. |
| SWAP(row4, alt0); |
| SWAP(row5, alt1); |
| SWAP(row6, alt2); |
| SWAP(row7, alt3); |
| |
| // Now, transpose each block of four |
| TRANSPOSE4(row0, row1, row2, row3); |
| TRANSPOSE4(row4, row5, row6, row7); |
| TRANSPOSE4(alt0, alt1, alt2, alt3); |
| TRANSPOSE4(alt4, alt5, alt6, alt7); |
| } |
| } |
| } |
| |
| // perform the quantize step, using the floating point data |
| // still in the row/alt registers |
| { |
| const int* biasAddr; |
| const vector signed int* qmat; |
| vector float bias, negBias; |
| |
| if (s->mb_intra) { |
| vector signed int baseVector; |
| |
| // We must cache element 0 in the intra case |
| // (it needs special handling). |
| baseVector = vec_cts(vec_splat(row0, 0), 0); |
| vec_ste(baseVector, 0, &oldBaseValue); |
| |
| qmat = (vector signed int*)s->q_intra_matrix[qscale]; |
| biasAddr = &(s->intra_quant_bias); |
| } else { |
| qmat = (vector signed int*)s->q_inter_matrix[qscale]; |
| biasAddr = &(s->inter_quant_bias); |
| } |
| |
| // Load the bias vector (We add 0.5 to the bias so that we're |
| // rounding when we convert to int, instead of flooring.) |
| { |
| vector signed int biasInt; |
| const vector float negOneFloat = (vector float)FOUROF(-1.0f); |
| LOAD4(biasInt, biasAddr); |
| bias = vec_ctf(biasInt, QUANT_BIAS_SHIFT); |
| negBias = vec_madd(bias, negOneFloat, zero); |
| } |
| |
| { |
| vector float q0, q1, q2, q3, q4, q5, q6, q7; |
| |
| q0 = vec_ctf(qmat[0], QMAT_SHIFT); |
| q1 = vec_ctf(qmat[2], QMAT_SHIFT); |
| q2 = vec_ctf(qmat[4], QMAT_SHIFT); |
| q3 = vec_ctf(qmat[6], QMAT_SHIFT); |
| q4 = vec_ctf(qmat[8], QMAT_SHIFT); |
| q5 = vec_ctf(qmat[10], QMAT_SHIFT); |
| q6 = vec_ctf(qmat[12], QMAT_SHIFT); |
| q7 = vec_ctf(qmat[14], QMAT_SHIFT); |
| |
| row0 = vec_sel(vec_madd(row0, q0, negBias), vec_madd(row0, q0, bias), |
| vec_cmpgt(row0, zero)); |
| row1 = vec_sel(vec_madd(row1, q1, negBias), vec_madd(row1, q1, bias), |
| vec_cmpgt(row1, zero)); |
| row2 = vec_sel(vec_madd(row2, q2, negBias), vec_madd(row2, q2, bias), |
| vec_cmpgt(row2, zero)); |
| row3 = vec_sel(vec_madd(row3, q3, negBias), vec_madd(row3, q3, bias), |
| vec_cmpgt(row3, zero)); |
| row4 = vec_sel(vec_madd(row4, q4, negBias), vec_madd(row4, q4, bias), |
| vec_cmpgt(row4, zero)); |
| row5 = vec_sel(vec_madd(row5, q5, negBias), vec_madd(row5, q5, bias), |
| vec_cmpgt(row5, zero)); |
| row6 = vec_sel(vec_madd(row6, q6, negBias), vec_madd(row6, q6, bias), |
| vec_cmpgt(row6, zero)); |
| row7 = vec_sel(vec_madd(row7, q7, negBias), vec_madd(row7, q7, bias), |
| vec_cmpgt(row7, zero)); |
| |
| q0 = vec_ctf(qmat[1], QMAT_SHIFT); |
| q1 = vec_ctf(qmat[3], QMAT_SHIFT); |
| q2 = vec_ctf(qmat[5], QMAT_SHIFT); |
| q3 = vec_ctf(qmat[7], QMAT_SHIFT); |
| q4 = vec_ctf(qmat[9], QMAT_SHIFT); |
| q5 = vec_ctf(qmat[11], QMAT_SHIFT); |
| q6 = vec_ctf(qmat[13], QMAT_SHIFT); |
| q7 = vec_ctf(qmat[15], QMAT_SHIFT); |
| |
| alt0 = vec_sel(vec_madd(alt0, q0, negBias), vec_madd(alt0, q0, bias), |
| vec_cmpgt(alt0, zero)); |
| alt1 = vec_sel(vec_madd(alt1, q1, negBias), vec_madd(alt1, q1, bias), |
| vec_cmpgt(alt1, zero)); |
| alt2 = vec_sel(vec_madd(alt2, q2, negBias), vec_madd(alt2, q2, bias), |
| vec_cmpgt(alt2, zero)); |
| alt3 = vec_sel(vec_madd(alt3, q3, negBias), vec_madd(alt3, q3, bias), |
| vec_cmpgt(alt3, zero)); |
| alt4 = vec_sel(vec_madd(alt4, q4, negBias), vec_madd(alt4, q4, bias), |
| vec_cmpgt(alt4, zero)); |
| alt5 = vec_sel(vec_madd(alt5, q5, negBias), vec_madd(alt5, q5, bias), |
| vec_cmpgt(alt5, zero)); |
| alt6 = vec_sel(vec_madd(alt6, q6, negBias), vec_madd(alt6, q6, bias), |
| vec_cmpgt(alt6, zero)); |
| alt7 = vec_sel(vec_madd(alt7, q7, negBias), vec_madd(alt7, q7, bias), |
| vec_cmpgt(alt7, zero)); |
| } |
| |
| |
| } |
| |
| // Store the data back into the original block |
| { |
| vector signed short data0, data1, data2, data3, data4, data5, data6, data7; |
| |
| data0 = vec_pack(vec_cts(row0, 0), vec_cts(alt0, 0)); |
| data1 = vec_pack(vec_cts(row1, 0), vec_cts(alt1, 0)); |
| data2 = vec_pack(vec_cts(row2, 0), vec_cts(alt2, 0)); |
| data3 = vec_pack(vec_cts(row3, 0), vec_cts(alt3, 0)); |
| data4 = vec_pack(vec_cts(row4, 0), vec_cts(alt4, 0)); |
| data5 = vec_pack(vec_cts(row5, 0), vec_cts(alt5, 0)); |
| data6 = vec_pack(vec_cts(row6, 0), vec_cts(alt6, 0)); |
| data7 = vec_pack(vec_cts(row7, 0), vec_cts(alt7, 0)); |
| |
| { |
| // Clamp for overflow |
| vector signed int max_q_int, min_q_int; |
| vector signed short max_q, min_q; |
| |
| LOAD4(max_q_int, &(s->max_qcoeff)); |
| LOAD4(min_q_int, &(s->min_qcoeff)); |
| |
| max_q = vec_pack(max_q_int, max_q_int); |
| min_q = vec_pack(min_q_int, min_q_int); |
| |
| data0 = vec_max(vec_min(data0, max_q), min_q); |
| data1 = vec_max(vec_min(data1, max_q), min_q); |
| data2 = vec_max(vec_min(data2, max_q), min_q); |
| data4 = vec_max(vec_min(data4, max_q), min_q); |
| data5 = vec_max(vec_min(data5, max_q), min_q); |
| data6 = vec_max(vec_min(data6, max_q), min_q); |
| data7 = vec_max(vec_min(data7, max_q), min_q); |
| } |
| |
| { |
| vector bool char zero_01, zero_23, zero_45, zero_67; |
| vector signed char scanIndexes_01, scanIndexes_23, scanIndexes_45, scanIndexes_67; |
| vector signed char negOne = vec_splat_s8(-1); |
| vector signed char* scanPtr = |
| (vector signed char*)(s->intra_scantable.inverse); |
| signed char lastNonZeroChar; |
| |
| // Determine the largest non-zero index. |
| zero_01 = vec_pack(vec_cmpeq(data0, (vector signed short)zero), |
| vec_cmpeq(data1, (vector signed short)zero)); |
| zero_23 = vec_pack(vec_cmpeq(data2, (vector signed short)zero), |
| vec_cmpeq(data3, (vector signed short)zero)); |
| zero_45 = vec_pack(vec_cmpeq(data4, (vector signed short)zero), |
| vec_cmpeq(data5, (vector signed short)zero)); |
| zero_67 = vec_pack(vec_cmpeq(data6, (vector signed short)zero), |
| vec_cmpeq(data7, (vector signed short)zero)); |
| |
| // 64 biggest values |
| scanIndexes_01 = vec_sel(scanPtr[0], negOne, zero_01); |
| scanIndexes_23 = vec_sel(scanPtr[1], negOne, zero_23); |
| scanIndexes_45 = vec_sel(scanPtr[2], negOne, zero_45); |
| scanIndexes_67 = vec_sel(scanPtr[3], negOne, zero_67); |
| |
| // 32 largest values |
| scanIndexes_01 = vec_max(scanIndexes_01, scanIndexes_23); |
| scanIndexes_45 = vec_max(scanIndexes_45, scanIndexes_67); |
| |
| // 16 largest values |
| scanIndexes_01 = vec_max(scanIndexes_01, scanIndexes_45); |
| |
| // 8 largest values |
| scanIndexes_01 = vec_max(vec_mergeh(scanIndexes_01, negOne), |
| vec_mergel(scanIndexes_01, negOne)); |
| |
| // 4 largest values |
| scanIndexes_01 = vec_max(vec_mergeh(scanIndexes_01, negOne), |
| vec_mergel(scanIndexes_01, negOne)); |
| |
| // 2 largest values |
| scanIndexes_01 = vec_max(vec_mergeh(scanIndexes_01, negOne), |
| vec_mergel(scanIndexes_01, negOne)); |
| |
| // largest value |
| scanIndexes_01 = vec_max(vec_mergeh(scanIndexes_01, negOne), |
| vec_mergel(scanIndexes_01, negOne)); |
| |
| scanIndexes_01 = vec_splat(scanIndexes_01, 0); |
| |
| |
| vec_ste(scanIndexes_01, 0, &lastNonZeroChar); |
| |
| lastNonZero = lastNonZeroChar; |
| |
| // While the data is still in vectors we check for the transpose IDCT permute |
| // and handle it using the vector unit if we can. This is the permute used |
| // by the altivec idct, so it is common when using the altivec dct. |
| |
| if ((lastNonZero > 0) && (s->dsp.idct_permutation_type == FF_TRANSPOSE_IDCT_PERM)) { |
| TRANSPOSE8(data0, data1, data2, data3, data4, data5, data6, data7); |
| } |
| |
| vec_st(data0, 0, data); |
| vec_st(data1, 16, data); |
| vec_st(data2, 32, data); |
| vec_st(data3, 48, data); |
| vec_st(data4, 64, data); |
| vec_st(data5, 80, data); |
| vec_st(data6, 96, data); |
| vec_st(data7, 112, data); |
| } |
| } |
| |
| // special handling of block[0] |
| if (s->mb_intra) { |
| if (!s->h263_aic) { |
| if (n < 4) |
| oldBaseValue /= s->y_dc_scale; |
| else |
| oldBaseValue /= s->c_dc_scale; |
| } |
| |
| // Divide by 8, rounding the result |
| data[0] = (oldBaseValue + 4) >> 3; |
| } |
| |
| // We handled the transpose permutation above and we don't |
| // need to permute the "no" permutation case. |
| if ((lastNonZero > 0) && |
| (s->dsp.idct_permutation_type != FF_TRANSPOSE_IDCT_PERM) && |
| (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)) { |
| ff_block_permute(data, s->dsp.idct_permutation, |
| s->intra_scantable.scantable, lastNonZero); |
| } |
| |
| return lastNonZero; |
| } |
| |
| /* AltiVec version of dct_unquantize_h263 |
| this code assumes `block' is 16 bytes-aligned */ |
| void dct_unquantize_h263_altivec(MpegEncContext *s, |
| DCTELEM *block, int n, int qscale) |
| { |
| POWERPC_PERF_DECLARE(altivec_dct_unquantize_h263_num, 1); |
| int i, level, qmul, qadd; |
| int nCoeffs; |
| |
| assert(s->block_last_index[n]>=0); |
| |
| POWERPC_PERF_START_COUNT(altivec_dct_unquantize_h263_num, 1); |
| |
| qadd = (qscale - 1) | 1; |
| qmul = qscale << 1; |
| |
| if (s->mb_intra) { |
| if (!s->h263_aic) { |
| if (n < 4) |
| block[0] = block[0] * s->y_dc_scale; |
| else |
| block[0] = block[0] * s->c_dc_scale; |
| }else |
| qadd = 0; |
| i = 1; |
| nCoeffs= 63; //does not always use zigzag table |
| } else { |
| i = 0; |
| nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]; |
| } |
| |
| { |
| register const vector signed short vczero = (const vector signed short)vec_splat_s16(0); |
| DECLARE_ALIGNED_16(short, qmul8[]) = |
| { |
| qmul, qmul, qmul, qmul, |
| qmul, qmul, qmul, qmul |
| }; |
| DECLARE_ALIGNED_16(short, qadd8[]) = |
| { |
| qadd, qadd, qadd, qadd, |
| qadd, qadd, qadd, qadd |
| }; |
| DECLARE_ALIGNED_16(short, nqadd8[]) = |
| { |
| -qadd, -qadd, -qadd, -qadd, |
| -qadd, -qadd, -qadd, -qadd |
| }; |
| register vector signed short blockv, qmulv, qaddv, nqaddv, temp1; |
| register vector bool short blockv_null, blockv_neg; |
| register short backup_0 = block[0]; |
| register int j = 0; |
| |
| qmulv = vec_ld(0, qmul8); |
| qaddv = vec_ld(0, qadd8); |
| nqaddv = vec_ld(0, nqadd8); |
| |
| #if 0 // block *is* 16 bytes-aligned, it seems. |
| // first make sure block[j] is 16 bytes-aligned |
| for(j = 0; (j <= nCoeffs) && ((((unsigned long)block) + (j << 1)) & 0x0000000F) ; j++) { |
| level = block[j]; |
| if (level) { |
| if (level < 0) { |
| level = level * qmul - qadd; |
| } else { |
| level = level * qmul + qadd; |
| } |
| block[j] = level; |
| } |
| } |
| #endif |
| |
| // vectorize all the 16 bytes-aligned blocks |
| // of 8 elements |
| for(; (j + 7) <= nCoeffs ; j+=8) { |
| blockv = vec_ld(j << 1, block); |
| blockv_neg = vec_cmplt(blockv, vczero); |
| blockv_null = vec_cmpeq(blockv, vczero); |
| // choose between +qadd or -qadd as the third operand |
| temp1 = vec_sel(qaddv, nqaddv, blockv_neg); |
| // multiply & add (block{i,i+7} * qmul [+-] qadd) |
| temp1 = vec_mladd(blockv, qmulv, temp1); |
| // put 0 where block[{i,i+7} used to have 0 |
| blockv = vec_sel(temp1, blockv, blockv_null); |
| vec_st(blockv, j << 1, block); |
| } |
| |
| // if nCoeffs isn't a multiple of 8, finish the job |
| // using good old scalar units. |
| // (we could do it using a truncated vector, |
| // but I'm not sure it's worth the hassle) |
| for(; j <= nCoeffs ; j++) { |
| level = block[j]; |
| if (level) { |
| if (level < 0) { |
| level = level * qmul - qadd; |
| } else { |
| level = level * qmul + qadd; |
| } |
| block[j] = level; |
| } |
| } |
| |
| if (i == 1) { |
| // cheat. this avoid special-casing the first iteration |
| block[0] = backup_0; |
| } |
| } |
| POWERPC_PERF_STOP_COUNT(altivec_dct_unquantize_h263_num, nCoeffs == 63); |
| } |
| |
| |
| void idct_put_altivec(uint8_t *dest, int line_size, int16_t *block); |
| void idct_add_altivec(uint8_t *dest, int line_size, int16_t *block); |
| |
| void MPV_common_init_altivec(MpegEncContext *s) |
| { |
| if ((mm_flags & FF_MM_ALTIVEC) == 0) return; |
| |
| if (s->avctx->lowres==0) { |
| if ((s->avctx->idct_algo == FF_IDCT_AUTO) || |
| (s->avctx->idct_algo == FF_IDCT_ALTIVEC)) { |
| s->dsp.idct_put = idct_put_altivec; |
| s->dsp.idct_add = idct_add_altivec; |
| s->dsp.idct_permutation_type = FF_TRANSPOSE_IDCT_PERM; |
| } |
| } |
| |
| // Test to make sure that the dct required alignments are met. |
| if ((((long)(s->q_intra_matrix) & 0x0f) != 0) || |
| (((long)(s->q_inter_matrix) & 0x0f) != 0)) { |
| av_log(s->avctx, AV_LOG_INFO, "Internal Error: q-matrix blocks must be 16-byte aligned " |
| "to use AltiVec DCT. Reverting to non-AltiVec version.\n"); |
| return; |
| } |
| |
| if (((long)(s->intra_scantable.inverse) & 0x0f) != 0) { |
| av_log(s->avctx, AV_LOG_INFO, "Internal Error: scan table blocks must be 16-byte aligned " |
| "to use AltiVec DCT. Reverting to non-AltiVec version.\n"); |
| return; |
| } |
| |
| |
| if ((s->avctx->dct_algo == FF_DCT_AUTO) || |
| (s->avctx->dct_algo == FF_DCT_ALTIVEC)) { |
| #if 0 /* seems to cause trouble under some circumstances */ |
| s->dct_quantize = dct_quantize_altivec; |
| #endif |
| s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec; |
| s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec; |
| } |
| } |
