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Add IDCT8 routine in Altivec. Patch by yours truely with Linux fixes by Luca Barbato

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Originally committed as revision 7210 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Guillaume Poirier 18 years ago
parent 1e1b182d34
commit 3813dcc9bf
1 changed files with 127 additions and 0 deletions
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  1. 127
      libavcodec/ppc/h264_altivec.c

127
libavcodec/ppc/h264_altivec.c
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@ -23,6 +23,7 @@
#include "gcc_fixes.h"
#include "dsputil_altivec.h"
#include "types_altivec.h"
#define PUT_OP_U8_ALTIVEC(d, s, dst) d = s
#define AVG_OP_U8_ALTIVEC(d, s, dst) d = vec_avg(dst, s)
@ -398,6 +399,131 @@ static inline void avg_pixels16_l2_altivec( uint8_t * dst, const uint8_t * src1,
H264_MC(put_, 16, altivec)
H264_MC(avg_, 16, altivec)
/****************************************************************************
* IDCT transform:
****************************************************************************/
#define IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7, d0, d1, d2, d3, d4, d5, d6, d7) {\
/* a0 = SRC(0) + SRC(4); */ \
vec_s16_t a0v = vec_add(s0, s4); \
/* a2 = SRC(0) - SRC(4); */ \
vec_s16_t a2v = vec_sub(s0, s4); \
/* a4 = (SRC(2)>>1) - SRC(6); */ \
vec_s16_t a4v = vec_sub(vec_sra(s2, onev), s6); \
/* a6 = (SRC(6)>>1) + SRC(2); */ \
vec_s16_t a6v = vec_add(vec_sra(s6, onev), s2); \
/* b0 = a0 + a6; */ \
vec_s16_t b0v = vec_add(a0v, a6v); \
/* b2 = a2 + a4; */ \
vec_s16_t b2v = vec_add(a2v, a4v); \
/* b4 = a2 - a4; */ \
vec_s16_t b4v = vec_sub(a2v, a4v); \
/* b6 = a0 - a6; */ \
vec_s16_t b6v = vec_sub(a0v, a6v); \
/* a1 = SRC(5) - SRC(3) - SRC(7) - (SRC(7)>>1); */ \
/* a1 = (SRC(5)-SRC(3)) - (SRC(7) + (SRC(7)>>1)); */ \
vec_s16_t a1v = vec_sub( vec_sub(s5, s3), vec_add(s7, vec_sra(s7, onev)) ); \
/* a3 = SRC(7) + SRC(1) - SRC(3) - (SRC(3)>>1); */ \
/* a3 = (SRC(7)+SRC(1)) - (SRC(3) + (SRC(3)>>1)); */ \
vec_s16_t a3v = vec_sub( vec_add(s7, s1), vec_add(s3, vec_sra(s3, onev)) );\
/* a5 = SRC(7) - SRC(1) + SRC(5) + (SRC(5)>>1); */ \
/* a5 = (SRC(7)-SRC(1)) + SRC(5) + (SRC(5)>>1); */ \
vec_s16_t a5v = vec_add( vec_sub(s7, s1), vec_add(s5, vec_sra(s5, onev)) );\
/* a7 = SRC(5)+SRC(3) + SRC(1) + (SRC(1)>>1); */ \
vec_s16_t a7v = vec_add( vec_add(s5, s3), vec_add(s1, vec_sra(s1, onev)) );\
/* b1 = (a7>>2) + a1; */ \
vec_s16_t b1v = vec_add( vec_sra(a7v, twov), a1v); \
/* b3 = a3 + (a5>>2); */ \
vec_s16_t b3v = vec_add(a3v, vec_sra(a5v, twov)); \
/* b5 = (a3>>2) - a5; */ \
vec_s16_t b5v = vec_sub( vec_sra(a3v, twov), a5v); \
/* b7 = a7 - (a1>>2); */ \
vec_s16_t b7v = vec_sub( a7v, vec_sra(a1v, twov)); \
/* DST(0, b0 + b7); */ \
d0 = vec_add(b0v, b7v); \
/* DST(1, b2 + b5); */ \
d1 = vec_add(b2v, b5v); \
/* DST(2, b4 + b3); */ \
d2 = vec_add(b4v, b3v); \
/* DST(3, b6 + b1); */ \
d3 = vec_add(b6v, b1v); \
/* DST(4, b6 - b1); */ \
d4 = vec_sub(b6v, b1v); \
/* DST(5, b4 - b3); */ \
d5 = vec_sub(b4v, b3v); \
/* DST(6, b2 - b5); */ \
d6 = vec_sub(b2v, b5v); \
/* DST(7, b0 - b7); */ \
d7 = vec_sub(b0v, b7v); \
}
#define ALTIVEC_STORE_SUM_CLIP(dest, idctv, perm_ldv, perm_stv, sel) { \
/* unaligned load */ \
vec_u8_t hv = vec_ld( 0, dest ); \
vec_u8_t lv = vec_ld( 7, dest ); \
vec_u8_t dstv = vec_perm( hv, lv, (vec_u8_t)perm_ldv ); \
vec_s16_t idct_sh6 = vec_sra(idctv, sixv); \
vec_u16_t dst16 = vec_mergeh(zero_u8v, dstv); \
vec_s16_t idstsum = vec_adds(idct_sh6, (vec_s16_t)dst16); \
vec_u8_t idstsum8 = vec_packsu(zero_s16v, idstsum); \
vec_u8_t edgehv; \
/* unaligned store */ \
vec_u8_t bodyv = vec_perm( idstsum8, idstsum8, perm_stv );\
vec_u8_t edgelv = vec_perm( sel, zero_u8v, perm_stv ); \
lv = vec_sel( lv, bodyv, edgelv ); \
vec_st( lv, 7, dest ); \
hv = vec_ld( 0, dest ); \
edgehv = vec_perm( zero_u8v, sel, perm_stv ); \
hv = vec_sel( hv, bodyv, edgehv ); \
vec_st( hv, 0, dest ); \
}
void ff_h264_idct8_add_altivec( uint8_t *dst, DCTELEM *dct, int stride ) {
vec_s16_t s0, s1, s2, s3, s4, s5, s6, s7;
vec_s16_t d0, d1, d2, d3, d4, d5, d6, d7;
vec_s16_t idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7;
vec_u8_t perm_ldv = vec_lvsl(0, dst);
vec_u8_t perm_stv = vec_lvsr(8, dst);
const vec_u16_t onev = vec_splat_u16(1);
const vec_u16_t twov = vec_splat_u16(2);
const vec_u16_t sixv = vec_splat_u16(6);
const vec_u8_t sel = (vec_u8_t) AVV(0,0,0,0,0,0,0,0,
-1,-1,-1,-1,-1,-1,-1,-1);
LOAD_ZERO;
dct[0] += 32; // rounding for the >>6 at the end
s0 = vec_ld(0x00, (int16_t*)dct);
s1 = vec_ld(0x10, (int16_t*)dct);
s2 = vec_ld(0x20, (int16_t*)dct);
s3 = vec_ld(0x30, (int16_t*)dct);
s4 = vec_ld(0x40, (int16_t*)dct);
s5 = vec_ld(0x50, (int16_t*)dct);
s6 = vec_ld(0x60, (int16_t*)dct);
s7 = vec_ld(0x70, (int16_t*)dct);
IDCT8_1D_ALTIVEC(s0, s1, s2, s3, s4, s5, s6, s7,
d0, d1, d2, d3, d4, d5, d6, d7);
TRANSPOSE8( d0, d1, d2, d3, d4, d5, d6, d7 );
IDCT8_1D_ALTIVEC(d0, d1, d2, d3, d4, d5, d6, d7,
idct0, idct1, idct2, idct3, idct4, idct5, idct6, idct7);
ALTIVEC_STORE_SUM_CLIP(&dst[0*stride], idct0, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[1*stride], idct1, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[2*stride], idct2, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[3*stride], idct3, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[4*stride], idct4, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[5*stride], idct5, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[6*stride], idct6, perm_ldv, perm_stv, sel);
ALTIVEC_STORE_SUM_CLIP(&dst[7*stride], idct7, perm_ldv, perm_stv, sel);
}
void dsputil_h264_init_ppc(DSPContext* c, AVCodecContext *avctx) {
#ifdef HAVE_ALTIVEC
@ -405,6 +531,7 @@ void dsputil_h264_init_ppc(DSPContext* c, AVCodecContext *avctx) {
c->put_h264_chroma_pixels_tab[0] = put_h264_chroma_mc8_altivec;
c->put_no_rnd_h264_chroma_pixels_tab[0] = put_no_rnd_h264_chroma_mc8_altivec;
c->avg_h264_chroma_pixels_tab[0] = avg_h264_chroma_mc8_altivec;
c->h264_idct8_add = ff_h264_idct8_add_altivec;
#define dspfunc(PFX, IDX, NUM) \
c->PFX ## _pixels_tab[IDX][ 0] = PFX ## NUM ## _mc00_altivec; \

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