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/*
* Copyright (c) 2001 Michel Lespinasse
*
* 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
*/
/* 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 FFmpeg.
*
* FFmpeg 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 <stdlib.h>
#include <string.h>
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/ppc/types_altivec.h"
#include "libavcodec/idctdsp.h"
#if HAVE_ALTIVEC
#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_altivec(int16_t *blk)
{
vec_s16 *block = (vec_s16 *) blk;
IDCT;
block[0] = vx0;
block[1] = vx1;
block[2] = vx2;
block[3] = vx3;
block[4] = vx4;
block[5] = vx5;
block[6] = vx6;
block[7] = vx7;
}
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;
#if HAVE_BIGENDIAN
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);
#endif
#if HAVE_BIGENDIAN
#define GET_TMP2(dest, prm) \
tmp = vec_ld(0, dest); \
tmp2 = (vec_s16) vec_perm(tmp, (vec_u8) zero, prm);
#else
#define GET_TMP2(dest, prm) \
tmp = vec_vsx_ld(0, dest); \
tmp2 = (vec_s16) vec_mergeh(tmp, (vec_u8) zero)
#endif
#define ADD(dest, src, perm) \
GET_TMP2(dest, 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 */
av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
unsigned high_bit_depth)
{
#if HAVE_ALTIVEC
if (!PPC_ALTIVEC(av_get_cpu_flags()))
return;
if (!high_bit_depth && avctx->lowres == 0) {
if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & AV_CODEC_FLAG_BITEXACT)) ||
(avctx->idct_algo == FF_IDCT_ALTIVEC)) {
c->idct = idct_altivec;
c->idct_add = idct_add_altivec;
c->idct_put = idct_put_altivec;
c->perm_type = FF_IDCT_PERM_TRANSPOSE;
}
}
#endif /* HAVE_ALTIVEC */
}
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