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- /*
- * Copyright (c) 2001 Michel Lespinasse
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- /* NOTE: This code is based on GPL code from the libmpeg2 project. The
- * author, Michel Lespinasses, has given explicit permission to release
- * under LGPL as part of Libav.
- *
- * Libav integration by Dieter Shirley
- *
- * This file is a direct copy of the AltiVec IDCT module from the libmpeg2
- * project. I've deleted all of the libmpeg2-specific code, renamed the
- * functions and reordered the function parameters. The only change to the
- * IDCT function itself was to factor out the partial transposition, and to
- * perform a full transpose at the end of the function. */
-
- #include "config.h"
-
- #include <stdlib.h>
- #include <string.h>
-
- #include "libavutil/attributes.h"
- #include "libavutil/cpu.h"
- #include "libavutil/ppc/cpu.h"
- #include "libavutil/ppc/util_altivec.h"
-
- #include "libavcodec/idctdsp.h"
-
- #if HAVE_ALTIVEC && HAVE_BIGENDIAN
-
- #define IDCT_HALF \
- /* 1st stage */ \
- t1 = vec_mradds(a1, vx7, vx1); \
- t8 = vec_mradds(a1, vx1, vec_subs(zero, vx7)); \
- t7 = vec_mradds(a2, vx5, vx3); \
- t3 = vec_mradds(ma2, vx3, vx5); \
- \
- /* 2nd stage */ \
- t5 = vec_adds(vx0, vx4); \
- t0 = vec_subs(vx0, vx4); \
- t2 = vec_mradds(a0, vx6, vx2); \
- t4 = vec_mradds(a0, vx2, vec_subs(zero, vx6)); \
- t6 = vec_adds(t8, t3); \
- t3 = vec_subs(t8, t3); \
- t8 = vec_subs(t1, t7); \
- t1 = vec_adds(t1, t7); \
- \
- /* 3rd stage */ \
- t7 = vec_adds(t5, t2); \
- t2 = vec_subs(t5, t2); \
- t5 = vec_adds(t0, t4); \
- t0 = vec_subs(t0, t4); \
- t4 = vec_subs(t8, t3); \
- t3 = vec_adds(t8, t3); \
- \
- /* 4th stage */ \
- vy0 = vec_adds(t7, t1); \
- vy7 = vec_subs(t7, t1); \
- vy1 = vec_mradds(c4, t3, t5); \
- vy6 = vec_mradds(mc4, t3, t5); \
- vy2 = vec_mradds(c4, t4, t0); \
- vy5 = vec_mradds(mc4, t4, t0); \
- vy3 = vec_adds(t2, t6); \
- vy4 = vec_subs(t2, t6)
-
- #define IDCT \
- vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \
- vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \
- \
- vec_s16 c4 = vec_splat(constants[0], 0); \
- vec_s16 a0 = vec_splat(constants[0], 1); \
- vec_s16 a1 = vec_splat(constants[0], 2); \
- vec_s16 a2 = vec_splat(constants[0], 3); \
- vec_s16 mc4 = vec_splat(constants[0], 4); \
- vec_s16 ma2 = vec_splat(constants[0], 5); \
- vec_s16 bias = (vec_s16) vec_splat((vec_s32) constants[0], 3); \
- \
- vec_s16 zero = vec_splat_s16(0); \
- vec_u16 shift = vec_splat_u16(4); \
- \
- vec_s16 vx0 = vec_mradds(vec_sl(block[0], shift), constants[1], zero); \
- vec_s16 vx1 = vec_mradds(vec_sl(block[1], shift), constants[2], zero); \
- vec_s16 vx2 = vec_mradds(vec_sl(block[2], shift), constants[3], zero); \
- vec_s16 vx3 = vec_mradds(vec_sl(block[3], shift), constants[4], zero); \
- vec_s16 vx4 = vec_mradds(vec_sl(block[4], shift), constants[1], zero); \
- vec_s16 vx5 = vec_mradds(vec_sl(block[5], shift), constants[4], zero); \
- vec_s16 vx6 = vec_mradds(vec_sl(block[6], shift), constants[3], zero); \
- vec_s16 vx7 = vec_mradds(vec_sl(block[7], shift), constants[2], zero); \
- \
- IDCT_HALF; \
- \
- vx0 = vec_mergeh(vy0, vy4); \
- vx1 = vec_mergel(vy0, vy4); \
- vx2 = vec_mergeh(vy1, vy5); \
- vx3 = vec_mergel(vy1, vy5); \
- vx4 = vec_mergeh(vy2, vy6); \
- vx5 = vec_mergel(vy2, vy6); \
- vx6 = vec_mergeh(vy3, vy7); \
- vx7 = vec_mergel(vy3, vy7); \
- \
- vy0 = vec_mergeh(vx0, vx4); \
- vy1 = vec_mergel(vx0, vx4); \
- vy2 = vec_mergeh(vx1, vx5); \
- vy3 = vec_mergel(vx1, vx5); \
- vy4 = vec_mergeh(vx2, vx6); \
- vy5 = vec_mergel(vx2, vx6); \
- vy6 = vec_mergeh(vx3, vx7); \
- vy7 = vec_mergel(vx3, vx7); \
- \
- vx0 = vec_adds(vec_mergeh(vy0, vy4), bias); \
- vx1 = vec_mergel(vy0, vy4); \
- vx2 = vec_mergeh(vy1, vy5); \
- vx3 = vec_mergel(vy1, vy5); \
- vx4 = vec_mergeh(vy2, vy6); \
- vx5 = vec_mergel(vy2, vy6); \
- vx6 = vec_mergeh(vy3, vy7); \
- vx7 = vec_mergel(vy3, vy7); \
- \
- IDCT_HALF; \
- \
- shift = vec_splat_u16(6); \
- vx0 = vec_sra(vy0, shift); \
- vx1 = vec_sra(vy1, shift); \
- vx2 = vec_sra(vy2, shift); \
- vx3 = vec_sra(vy3, shift); \
- vx4 = vec_sra(vy4, shift); \
- vx5 = vec_sra(vy5, shift); \
- vx6 = vec_sra(vy6, shift); \
- vx7 = vec_sra(vy7, shift)
-
- static const vec_s16 constants[5] = {
- { 23170, 13573, 6518, 21895, -23170, -21895, 32, 31 },
- { 16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725 },
- { 22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521 },
- { 21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692 },
- { 19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722 }
- };
-
- static void idct_put_altivec(uint8_t *dest, ptrdiff_t stride, int16_t *blk)
- {
- vec_s16 *block = (vec_s16 *) blk;
- vec_u8 tmp;
-
- IDCT;
-
- #define COPY(dest, src) \
- tmp = vec_packsu(src, src); \
- vec_ste((vec_u32) tmp, 0, (unsigned int *) dest); \
- vec_ste((vec_u32) tmp, 4, (unsigned int *) dest)
-
- COPY(dest, vx0);
- dest += stride;
- COPY(dest, vx1);
- dest += stride;
- COPY(dest, vx2);
- dest += stride;
- COPY(dest, vx3);
- dest += stride;
- COPY(dest, vx4);
- dest += stride;
- COPY(dest, vx5);
- dest += stride;
- COPY(dest, vx6);
- dest += stride;
- COPY(dest, vx7);
- }
-
- static void idct_add_altivec(uint8_t *dest, ptrdiff_t stride, int16_t *blk)
- {
- vec_s16 *block = (vec_s16 *) blk;
- vec_u8 tmp;
- vec_s16 tmp2, tmp3;
- vec_u8 perm0;
- vec_u8 perm1;
- vec_u8 p0, p1, p;
-
- IDCT;
-
- p0 = vec_lvsl(0, dest);
- p1 = vec_lvsl(stride, dest);
- p = vec_splat_u8(-1);
- perm0 = vec_mergeh(p, p0);
- perm1 = vec_mergeh(p, p1);
-
- #define ADD(dest, src, perm) \
- /* *(uint64_t *) &tmp = *(uint64_t *) dest; */ \
- tmp = vec_ld(0, dest); \
- tmp2 = (vec_s16) vec_perm(tmp, (vec_u8) zero, perm); \
- tmp3 = vec_adds(tmp2, src); \
- tmp = vec_packsu(tmp3, tmp3); \
- vec_ste((vec_u32) tmp, 0, (unsigned int *) dest); \
- vec_ste((vec_u32) tmp, 4, (unsigned int *) dest)
-
- ADD(dest, vx0, perm0);
- dest += stride;
- ADD(dest, vx1, perm1);
- dest += stride;
- ADD(dest, vx2, perm0);
- dest += stride;
- ADD(dest, vx3, perm1);
- dest += stride;
- ADD(dest, vx4, perm0);
- dest += stride;
- ADD(dest, vx5, perm1);
- dest += stride;
- ADD(dest, vx6, perm0);
- dest += stride;
- ADD(dest, vx7, perm1);
- }
-
- #endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
-
- av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
- unsigned high_bit_depth)
- {
- #if HAVE_ALTIVEC && HAVE_BIGENDIAN
- if (!PPC_ALTIVEC(av_get_cpu_flags()))
- return;
-
- if (!high_bit_depth) {
- if ((avctx->idct_algo == FF_IDCT_AUTO) ||
- (avctx->idct_algo == FF_IDCT_ALTIVEC)) {
- c->idct_add = idct_add_altivec;
- c->idct_put = idct_put_altivec;
- c->perm_type = FF_IDCT_PERM_TRANSPOSE;
- }
- }
- #endif /* HAVE_ALTIVEC && HAVE_BIGENDIAN */
- }
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