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ffmpeg / libavcodec / ppc / vc1dsp_altivec.c @ d2e45f33

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/*
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 * VC-1 and WMV3 decoder - DSP functions AltiVec-optimized
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 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "dsputil.h"
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#include "gcc_fixes.h"
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#include "util_altivec.h"
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// main steps of 8x8 transform
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#define STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_rnd) \
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do { \
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    t0 = vec_sl(vec_add(s0, s4), vec_2); \
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    t0 = vec_add(vec_sl(t0, vec_1), t0); \
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    t0 = vec_add(t0, vec_rnd); \
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    t1 = vec_sl(vec_sub(s0, s4), vec_2); \
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    t1 = vec_add(vec_sl(t1, vec_1), t1); \
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    t1 = vec_add(t1, vec_rnd); \
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    t2 = vec_add(vec_sl(s6, vec_2), vec_sl(s6, vec_1)); \
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    t2 = vec_add(t2, vec_sl(s2, vec_4)); \
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    t3 = vec_add(vec_sl(s2, vec_2), vec_sl(s2, vec_1)); \
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    t3 = vec_sub(t3, vec_sl(s6, vec_4)); \
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    t4 = vec_add(t0, t2); \
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    t5 = vec_add(t1, t3); \
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    t6 = vec_sub(t1, t3); \
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    t7 = vec_sub(t0, t2); \
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\
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    t0 = vec_sl(vec_add(s1, s3), vec_4); \
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    t0 = vec_add(t0, vec_sl(s5, vec_3)); \
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    t0 = vec_add(t0, vec_sl(s7, vec_2)); \
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    t0 = vec_add(t0, vec_sub(s5, s3)); \
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\
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    t1 = vec_sl(vec_sub(s1, s5), vec_4); \
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    t1 = vec_sub(t1, vec_sl(s7, vec_3)); \
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    t1 = vec_sub(t1, vec_sl(s3, vec_2)); \
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    t1 = vec_sub(t1, vec_add(s1, s7)); \
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\
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    t2 = vec_sl(vec_sub(s7, s3), vec_4); \
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    t2 = vec_add(t2, vec_sl(s1, vec_3)); \
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    t2 = vec_add(t2, vec_sl(s5, vec_2)); \
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    t2 = vec_add(t2, vec_sub(s1, s7)); \
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\
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    t3 = vec_sl(vec_sub(s5, s7), vec_4); \
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    t3 = vec_sub(t3, vec_sl(s3, vec_3)); \
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    t3 = vec_add(t3, vec_sl(s1, vec_2)); \
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    t3 = vec_sub(t3, vec_add(s3, s5)); \
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\
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    s0 = vec_add(t4, t0); \
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    s1 = vec_add(t5, t1); \
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    s2 = vec_add(t6, t2); \
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    s3 = vec_add(t7, t3); \
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    s4 = vec_sub(t7, t3); \
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    s5 = vec_sub(t6, t2); \
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    s6 = vec_sub(t5, t1); \
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    s7 = vec_sub(t4, t0); \
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}while(0)
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#define SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7) \
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do { \
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    s0 = vec_sra(s0, vec_3); \
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    s1 = vec_sra(s1, vec_3); \
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    s2 = vec_sra(s2, vec_3); \
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    s3 = vec_sra(s3, vec_3); \
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    s4 = vec_sra(s4, vec_3); \
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    s5 = vec_sra(s5, vec_3); \
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    s6 = vec_sra(s6, vec_3); \
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    s7 = vec_sra(s7, vec_3); \
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}while(0)
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#define SHIFT_VERT8(s0, s1, s2, s3, s4, s5, s6, s7) \
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do { \
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    s0 = vec_sra(s0, vec_7); \
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    s1 = vec_sra(s1, vec_7); \
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    s2 = vec_sra(s2, vec_7); \
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    s3 = vec_sra(s3, vec_7); \
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    s4 = vec_sra(vec_add(s4, vec_1s), vec_7); \
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    s5 = vec_sra(vec_add(s5, vec_1s), vec_7); \
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    s6 = vec_sra(vec_add(s6, vec_1s), vec_7); \
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    s7 = vec_sra(vec_add(s7, vec_1s), vec_7); \
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}while(0)
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/* main steps of 4x4 transform */
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#define STEP4(s0, s1, s2, s3, vec_rnd) \
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do { \
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    t1 = vec_add(vec_sl(s0, vec_4), s0); \
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    t1 = vec_add(t1, vec_rnd); \
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    t2 = vec_add(vec_sl(s2, vec_4), s2); \
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    t0 = vec_add(t1, t2); \
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    t1 = vec_sub(t1, t2); \
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    t3 = vec_sl(vec_sub(s3, s1), vec_1); \
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    t3 = vec_add(t3, vec_sl(t3, vec_2)); \
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    t2 = vec_add(t3, vec_sl(s1, vec_5)); \
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    t3 = vec_add(t3, vec_sl(s3, vec_3)); \
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    t3 = vec_add(t3, vec_sl(s3, vec_2)); \
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    s0 = vec_add(t0, t2); \
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    s1 = vec_sub(t1, t3); \
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    s2 = vec_add(t1, t3); \
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    s3 = vec_sub(t0, t2); \
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}while (0)
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#define SHIFT_HOR4(s0, s1, s2, s3) \
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    s0 = vec_sra(s0, vec_3); \
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    s1 = vec_sra(s1, vec_3); \
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    s2 = vec_sra(s2, vec_3); \
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    s3 = vec_sra(s3, vec_3);
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#define SHIFT_VERT4(s0, s1, s2, s3) \
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    s0 = vec_sra(s0, vec_7); \
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    s1 = vec_sra(s1, vec_7); \
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    s2 = vec_sra(s2, vec_7); \
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    s3 = vec_sra(s3, vec_7);
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/** Do inverse transform on 8x8 block
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*/
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static void vc1_inv_trans_8x8_altivec(DCTELEM block[64])
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{
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    vector signed short src0, src1, src2, src3, src4, src5, src6, src7;
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    vector signed int s0, s1, s2, s3, s4, s5, s6, s7;
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    vector signed int s8, s9, sA, sB, sC, sD, sE, sF;
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    vector signed int t0, t1, t2, t3, t4, t5, t6, t7;
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    const vector signed int vec_64 = vec_sl(vec_splat_s32(4), vec_splat_u32(4));
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    const vector unsigned int vec_7 = vec_splat_u32(7);
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    const vector unsigned int vec_4 = vec_splat_u32(4);
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    const vector  signed int vec_4s = vec_splat_s32(4);
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    const vector unsigned int vec_3 = vec_splat_u32(3);
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    const vector unsigned int vec_2 = vec_splat_u32(2);
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    const vector  signed int vec_1s = vec_splat_s32(1);
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    const vector unsigned int vec_1 = vec_splat_u32(1);
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    src0 = vec_ld(  0, block);
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    src1 = vec_ld( 16, block);
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    src2 = vec_ld( 32, block);
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    src3 = vec_ld( 48, block);
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    src4 = vec_ld( 64, block);
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    src5 = vec_ld( 80, block);
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    src6 = vec_ld( 96, block);
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    src7 = vec_ld(112, block);
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    TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
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    s0 = vec_unpackl(src0);
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    s1 = vec_unpackl(src1);
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    s2 = vec_unpackl(src2);
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    s3 = vec_unpackl(src3);
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    s4 = vec_unpackl(src4);
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    s5 = vec_unpackl(src5);
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    s6 = vec_unpackl(src6);
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    s7 = vec_unpackl(src7);
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    s8 = vec_unpackh(src0);
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    s9 = vec_unpackh(src1);
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    sA = vec_unpackh(src2);
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    sB = vec_unpackh(src3);
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    sC = vec_unpackh(src4);
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    sD = vec_unpackh(src5);
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    sE = vec_unpackh(src6);
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    sF = vec_unpackh(src7);
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    STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_4s);
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    SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7);
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    STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_4s);
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    SHIFT_HOR8(s8, s9, sA, sB, sC, sD, sE, sF);
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    src0 = vec_pack(s8, s0);
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    src1 = vec_pack(s9, s1);
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    src2 = vec_pack(sA, s2);
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    src3 = vec_pack(sB, s3);
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    src4 = vec_pack(sC, s4);
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    src5 = vec_pack(sD, s5);
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    src6 = vec_pack(sE, s6);
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    src7 = vec_pack(sF, s7);
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    TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
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    s0 = vec_unpackl(src0);
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    s1 = vec_unpackl(src1);
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    s2 = vec_unpackl(src2);
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    s3 = vec_unpackl(src3);
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    s4 = vec_unpackl(src4);
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    s5 = vec_unpackl(src5);
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    s6 = vec_unpackl(src6);
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    s7 = vec_unpackl(src7);
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    s8 = vec_unpackh(src0);
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    s9 = vec_unpackh(src1);
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    sA = vec_unpackh(src2);
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    sB = vec_unpackh(src3);
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    sC = vec_unpackh(src4);
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    sD = vec_unpackh(src5);
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    sE = vec_unpackh(src6);
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    sF = vec_unpackh(src7);
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    STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_64);
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    SHIFT_VERT8(s0, s1, s2, s3, s4, s5, s6, s7);
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    STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_64);
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    SHIFT_VERT8(s8, s9, sA, sB, sC, sD, sE, sF);
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    src0 = vec_pack(s8, s0);
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    src1 = vec_pack(s9, s1);
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    src2 = vec_pack(sA, s2);
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    src3 = vec_pack(sB, s3);
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    src4 = vec_pack(sC, s4);
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    src5 = vec_pack(sD, s5);
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    src6 = vec_pack(sE, s6);
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    src7 = vec_pack(sF, s7);
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    vec_st(src0,  0, block);
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    vec_st(src1, 16, block);
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    vec_st(src2, 32, block);
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    vec_st(src3, 48, block);
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    vec_st(src4, 64, block);
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    vec_st(src5, 80, block);
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    vec_st(src6, 96, block);
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    vec_st(src7,112, block);
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}
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/** Do inverse transform on 8x4 part of block
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*/
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static void vc1_inv_trans_8x4_altivec(DCTELEM block[64], int n)
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{
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    vector signed short src0, src1, src2, src3, src4, src5, src6, src7;
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    vector signed int s0, s1, s2, s3, s4, s5, s6, s7;
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    vector signed int s8, s9, sA, sB, sC, sD, sE, sF;
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    vector signed int t0, t1, t2, t3, t4, t5, t6, t7;
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    const vector signed int vec_64 = vec_sl(vec_splat_s32(4), vec_splat_u32(4));
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    const vector unsigned int vec_7 = vec_splat_u32(7);
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    const vector unsigned int vec_5 = vec_splat_u32(5);
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    const vector unsigned int vec_4 = vec_splat_u32(4);
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    const vector  signed int vec_4s = vec_splat_s32(4);
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    const vector unsigned int vec_3 = vec_splat_u32(3);
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    const vector unsigned int vec_2 = vec_splat_u32(2);
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    const vector unsigned int vec_1 = vec_splat_u32(1);
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    src0 = vec_ld(  0, block);
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    src1 = vec_ld( 16, block);
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    src2 = vec_ld( 32, block);
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    src3 = vec_ld( 48, block);
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    src4 = vec_ld( 64, block);
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    src5 = vec_ld( 80, block);
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    src6 = vec_ld( 96, block);
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    src7 = vec_ld(112, block);
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    TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
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    s0 = vec_unpackl(src0);
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    s1 = vec_unpackl(src1);
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    s2 = vec_unpackl(src2);
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    s3 = vec_unpackl(src3);
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    s4 = vec_unpackl(src4);
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    s5 = vec_unpackl(src5);
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    s6 = vec_unpackl(src6);
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    s7 = vec_unpackl(src7);
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    s8 = vec_unpackh(src0);
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    s9 = vec_unpackh(src1);
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    sA = vec_unpackh(src2);
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    sB = vec_unpackh(src3);
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    sC = vec_unpackh(src4);
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    sD = vec_unpackh(src5);
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    sE = vec_unpackh(src6);
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    sF = vec_unpackh(src7);
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    STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_4s);
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    SHIFT_HOR8(s0, s1, s2, s3, s4, s5, s6, s7);
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    STEP8(s8, s9, sA, sB, sC, sD, sE, sF, vec_4s);
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    SHIFT_HOR8(s8, s9, sA, sB, sC, sD, sE, sF);
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    src0 = vec_pack(s8, s0);
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    src1 = vec_pack(s9, s1);
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    src2 = vec_pack(sA, s2);
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    src3 = vec_pack(sB, s3);
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    src4 = vec_pack(sC, s4);
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    src5 = vec_pack(sD, s5);
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    src6 = vec_pack(sE, s6);
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    src7 = vec_pack(sF, s7);
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    TRANSPOSE8(src0, src1, src2, src3, src4, src5, src6, src7);
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    if(!n){ // upper half of block
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        s0 = vec_unpackh(src0);
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        s1 = vec_unpackh(src1);
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        s2 = vec_unpackh(src2);
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        s3 = vec_unpackh(src3);
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        s8 = vec_unpackl(src0);
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        s9 = vec_unpackl(src1);
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        sA = vec_unpackl(src2);
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        sB = vec_unpackl(src3);
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        STEP4(s0, s1, s2, s3, vec_64);
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        SHIFT_VERT4(s0, s1, s2, s3);
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        STEP4(s8, s9, sA, sB, vec_64);
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        SHIFT_VERT4(s8, s9, sA, sB);
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        src0 = vec_pack(s0, s8);
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        src1 = vec_pack(s1, s9);
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        src2 = vec_pack(s2, sA);
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        src3 = vec_pack(s3, sB);
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        vec_st(src0,  0, block);
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        vec_st(src1, 16, block);
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        vec_st(src2, 32, block);
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        vec_st(src3, 48, block);
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    } else { //lower half of block
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        s0 = vec_unpackh(src4);
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        s1 = vec_unpackh(src5);
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        s2 = vec_unpackh(src6);
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        s3 = vec_unpackh(src7);
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        s8 = vec_unpackl(src4);
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        s9 = vec_unpackl(src5);
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        sA = vec_unpackl(src6);
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        sB = vec_unpackl(src7);
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        STEP4(s0, s1, s2, s3, vec_64);
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        SHIFT_VERT4(s0, s1, s2, s3);
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        STEP4(s8, s9, sA, sB, vec_64);
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        SHIFT_VERT4(s8, s9, sA, sB);
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        src4 = vec_pack(s0, s8);
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        src5 = vec_pack(s1, s9);
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        src6 = vec_pack(s2, sA);
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        src7 = vec_pack(s3, sB);
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        vec_st(src4, 64, block);
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        vec_st(src5, 80, block);
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        vec_st(src6, 96, block);
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        vec_st(src7,112, block);
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    }
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}
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void vc1dsp_init_altivec(DSPContext* dsp, AVCodecContext *avctx) {
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    dsp->vc1_inv_trans_8x8 = vc1_inv_trans_8x8_altivec;
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    //dsp->vc1_inv_trans_8x4 = vc1_inv_trans_8x4_altivec;
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}