Altivec VP8 MC functions

Originally committed as revision 23884 to svn://svn.ffmpeg.org/ffmpeg/trunk

2 files changed, 296 insertions, 0 deletions

diff --git a/libavcodec/ppc/Makefile b/libavcodec/ppc/Makefile
index 5d5a59b4c5..32c9082342 100644
--- a/libavcodec/ppc/Makefile
+++ b/libavcodec/ppc/Makefile
@@ -5,6 +5,7 @@ ALTIVEC-OBJS-$(CONFIG_VC1_DECODER)     += ppc/vc1dsp_altivec.o
 ALTIVEC-OBJS-$(CONFIG_VP3_DECODER)     += ppc/vp3dsp_altivec.o
 ALTIVEC-OBJS-$(CONFIG_VP5_DECODER)     += ppc/vp3dsp_altivec.o
 ALTIVEC-OBJS-$(CONFIG_VP6_DECODER)     += ppc/vp3dsp_altivec.o
+ALTIVEC-OBJS-$(CONFIG_VP8_DECODER)     += ppc/vp8dsp_altivec.o
 
 OBJS-$(HAVE_ALTIVEC)                   += ppc/check_altivec.o           \
                                           ppc/dsputil_altivec.o         \
diff --git a/libavcodec/ppc/vp8dsp_altivec.c b/libavcodec/ppc/vp8dsp_altivec.c
new file mode 100644
index 0000000000..f7b3cda7a4
--- /dev/null
+++ b/libavcodec/ppc/vp8dsp_altivec.c
@@ -0,0 +1,295 @@
+/**
+ * VP8 compatible video decoder
+ *
+ * Copyright (C) 2010 David Conrad
+ *
+ * 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 "libavcodec/vp8dsp.h"
+#include "dsputil_altivec.h"
+#include "types_altivec.h"
+#include "util_altivec.h"
+
+#define REPT4(...) { __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__ }
+
+// h subpel filter uses msum to multiply+add 4 pixel taps at once
+static const vec_s8 h_subpel_filters_inner[7] =
+{
+    REPT4( -6, 123,  12,  -1),
+    REPT4(-11, 108,  36,  -8),
+    REPT4( -9,  93,  50,  -6),
+    REPT4(-16,  77,  77, -16),
+    REPT4( -6,  50,  93,  -9),
+    REPT4( -8,  36, 108, -11),
+    REPT4( -1,  12, 123,  -6),
+};
+
+// for 6tap filters, these are the outer two taps
+// The zeros mask off pixels 4-7 when filtering 0-3
+// and vice-versa
+static const vec_s8 h_subpel_filters_outer[3] =
+{
+    REPT4(0, 0, 2, 1),
+    REPT4(0, 0, 3, 3),
+    REPT4(0, 0, 1, 2),
+};
+
+#define LOAD_H_SUBPEL_FILTER(i) \
+    vec_s8 filter_inner  = h_subpel_filters_inner[i]; \
+    vec_s8 filter_outerh = h_subpel_filters_outer[(i)>>1]; \
+    vec_s8 filter_outerl = vec_sld(filter_outerh, filter_outerh, 2)
+
+#define FILTER_H(dstv, off) \
+    a = vec_ld((off)-2,    src); \
+    b = vec_ld((off)-2+15, src); \
+\
+    pixh  = vec_perm(a, b, permh##off); \
+    pixl  = vec_perm(a, b, perml##off); \
+    filth = vec_msum(filter_inner, pixh, c64); \
+    filtl = vec_msum(filter_inner, pixl, c64); \
+\
+    if (is6tap) { \
+        outer = vec_perm(a, b, perm_6tap##off); \
+        filth = vec_msum(filter_outerh, outer, filth); \
+        filtl = vec_msum(filter_outerl, outer, filtl); \
+    } \
+    if (w == 4) \
+        filtl = filth; /* discard pixels 4-7 */ \
+    dstv = vec_packs(filth, filtl); \
+    dstv = vec_sra(dstv, c7)
+
+static av_always_inline
+void put_vp8_epel_h_altivec_core(uint8_t *dst, int dst_stride,
+                                 uint8_t *src, int src_stride,
+                                 int h, int mx, int w, int is6tap)
+{
+    LOAD_H_SUBPEL_FILTER(mx-1);
+    vec_u8 align_vec0, align_vec8, permh0, permh8, filt;
+    vec_u8 perm_6tap0, perm_6tap8, perml0, perml8;
+    vec_u8 a, b, pixh, pixl, outer;
+    vec_s16 f16h, f16l;
+    vec_s32 filth, filtl;
+
+    vec_u8 perm_inner = { 1,2,3,4, 2,3,4,5, 3,4,5,6, 4,5,6,7 };
+    vec_u8 perm_outer = { 4,9, 0,5, 5,10, 1,6, 6,11, 2,7, 7,12, 3,8 };
+    vec_s32 c64 = vec_sl(vec_splat_s32(1), vec_splat_u32(6));
+    vec_u16 c7  = vec_splat_u16(7);
+
+    align_vec0 = vec_lvsl( -2, src);
+    align_vec8 = vec_lvsl(8-2, src);
+
+    permh0     = vec_perm(align_vec0, align_vec0, perm_inner);
+    permh8     = vec_perm(align_vec8, align_vec8, perm_inner);
+    perm_inner = vec_add(perm_inner, vec_splat_u8(4));
+    perml0     = vec_perm(align_vec0, align_vec0, perm_inner);
+    perml8     = vec_perm(align_vec8, align_vec8, perm_inner);
+    perm_6tap0 = vec_perm(align_vec0, align_vec0, perm_outer);
+    perm_6tap8 = vec_perm(align_vec8, align_vec8, perm_outer);
+
+    while (h --> 0) {
+        FILTER_H(f16h, 0);
+
+        if (w == 16) {
+            FILTER_H(f16l, 8);
+            filt = vec_packsu(f16h, f16l);
+            vec_st(filt, 0, dst);
+        } else {
+            filt = vec_packsu(f16h, f16h);
+            vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
+            if (w == 8)
+                vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
+        }
+        src += src_stride;
+        dst += dst_stride;
+    }
+}
+
+// v subpel filter does a simple vertical multiply + add
+static const vec_u8 v_subpel_filters[7] =
+{
+    { 0,   6, 123,  12,   1,   0 },
+    { 2,  11, 108,  36,   8,   1 },
+    { 0,   9,  93,  50,   6,   0 },
+    { 3,  16,  77,  77,  16,   3 },
+    { 0,   6,  50,  93,   9,   0 },
+    { 1,   8,  36, 108,  11,   2 },
+    { 0,   1,  12, 123,   6,   0 },
+};
+
+#define LOAD_V_SUBPEL_FILTER(i) \
+    vec_u8 subpel_filter = v_subpel_filters[i]; \
+    vec_u8 f0 = vec_splat(subpel_filter, 0); \
+    vec_u8 f1 = vec_splat(subpel_filter, 1); \
+    vec_u8 f2 = vec_splat(subpel_filter, 2); \
+    vec_u8 f3 = vec_splat(subpel_filter, 3); \
+    vec_u8 f4 = vec_splat(subpel_filter, 4); \
+    vec_u8 f5 = vec_splat(subpel_filter, 5)
+
+#define FILTER_V(dstv, vec_mul) \
+    s1f = (vec_s16)vec_mul(s1, f1); \
+    s2f = (vec_s16)vec_mul(s2, f2); \
+    s3f = (vec_s16)vec_mul(s3, f3); \
+    s4f = (vec_s16)vec_mul(s4, f4); \
+    s2f = vec_subs(s2f, s1f); \
+    s3f = vec_subs(s3f, s4f); \
+    if (is6tap) { \
+        s0f = (vec_s16)vec_mul(s0, f0); \
+        s5f = (vec_s16)vec_mul(s5, f5); \
+        s2f = vec_adds(s2f, s0f); \
+        s3f = vec_adds(s3f, s5f); \
+    } \
+    dstv = vec_adds(s2f, s3f); \
+    dstv = vec_adds(dstv, c64); \
+    dstv = vec_sra(dstv, c7)
+
+static av_always_inline
+void put_vp8_epel_v_altivec_core(uint8_t *dst, int dst_stride,
+                                 uint8_t *src, int src_stride,
+                                 int h, int my, int w, int is6tap)
+{
+    LOAD_V_SUBPEL_FILTER(my-1);
+    vec_u8 s0, s1, s2, s3, s4, s5, filt, align_vech, perm_vec, align_vecl;
+    vec_s16 s0f, s1f, s2f, s3f, s4f, s5f, f16h, f16l;
+    vec_s16 c64 = vec_sl(vec_splat_s16(1), vec_splat_u16(6));
+    vec_u16 c7  = vec_splat_u16(7);
+
+    // we want pixels 0-7 to be in the even positions and 8-15 in the odd,
+    // so combine this permute with the alignment permute vector
+    align_vech = vec_lvsl(0, src);
+    align_vecl = vec_sld(align_vech, align_vech, 8);
+    if (w ==16)
+        perm_vec = vec_mergeh(align_vech, align_vecl);
+    else
+        perm_vec = vec_mergeh(align_vech, align_vech);
+
+    if (is6tap)
+        s0 = load_with_perm_vec(-2*src_stride, src, perm_vec);
+    s1 = load_with_perm_vec(-1*src_stride, src, perm_vec);
+    s2 = load_with_perm_vec( 0*src_stride, src, perm_vec);
+    s3 = load_with_perm_vec( 1*src_stride, src, perm_vec);
+    if (is6tap)
+        s4 = load_with_perm_vec( 2*src_stride, src, perm_vec);
+
+    src += (2+is6tap)*src_stride;
+
+    while (h --> 0) {
+        if (is6tap)
+            s5 = load_with_perm_vec(0, src, perm_vec);
+        else
+            s4 = load_with_perm_vec(0, src, perm_vec);
+
+        FILTER_V(f16h, vec_mule);
+
+        if (w == 16) {
+            FILTER_V(f16l, vec_mulo);
+            filt = vec_packsu(f16h, f16l);
+            vec_st(filt, 0, dst);
+        } else {
+            filt = vec_packsu(f16h, f16h);
+            if (w == 4)
+                filt = (vec_u8)vec_splat((vec_u32)filt, 0);
+            else
+                vec_ste((vec_u32)filt, 4, (uint32_t*)dst);
+            vec_ste((vec_u32)filt, 0, (uint32_t*)dst);
+        }
+
+        if (is6tap)
+            s0 = s1;
+        s1 = s2;
+        s2 = s3;
+        s3 = s4;
+        if (is6tap)
+            s4 = s5;
+
+        dst += dst_stride;
+        src += src_stride;
+    }
+}
+
+#define EPEL_FUNCS(WIDTH, TAPS) \
+static av_noinline \
+void put_vp8_epel ## WIDTH ## _h ## TAPS ## _altivec(uint8_t *dst, int dst_stride, uint8_t *src, int src_stride, int h, int mx, int my) \
+{ \
+    put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
+} \
+\
+static av_noinline \
+void put_vp8_epel ## WIDTH ## _v ## TAPS ## _altivec(uint8_t *dst, int dst_stride, uint8_t *src, int src_stride, int h, int mx, int my) \
+{ \
+    put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
+}
+
+#define EPEL_HV(WIDTH, HTAPS, VTAPS) \
+static void put_vp8_epel ## WIDTH ## _h ## HTAPS ## v ## VTAPS ## _altivec(uint8_t *dst, int stride, uint8_t *src, int s, int h, int mx, int my) \
+{ \
+    DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
+    put_vp8_epel ## WIDTH ## _h ## HTAPS ## _altivec(tmp, 16,     src-2*stride, stride, h+5, mx, my); \
+    put_vp8_epel ## WIDTH ## _v ## VTAPS ## _altivec(dst, stride, tmp+2*16,     16,     h,   mx, my); \
+}
+
+EPEL_FUNCS(16,6)
+EPEL_FUNCS(8, 6)
+EPEL_FUNCS(8, 4)
+EPEL_FUNCS(4, 6)
+EPEL_FUNCS(4, 4)
+
+EPEL_HV(16, 6,6)
+EPEL_HV(8,  6,6)
+EPEL_HV(8,  4,6)
+EPEL_HV(8,  6,4)
+EPEL_HV(8,  4,4)
+EPEL_HV(4,  6,6)
+EPEL_HV(4,  4,6)
+EPEL_HV(4,  6,4)
+EPEL_HV(4,  4,4)
+
+static void put_vp8_pixels16_altivec(uint8_t *dst, int stride, uint8_t *src, int s, int h, int mx, int my)
+{
+    put_pixels16_altivec(dst, src, stride, h);
+}
+
+av_cold void ff_vp8dsp_init_altivec(VP8DSPContext *c)
+{
+    if (!has_altivec())
+        return;
+
+    c->put_vp8_epel_pixels_tab[0][0][0] = put_vp8_pixels16_altivec;
+    c->put_vp8_epel_pixels_tab[0][0][2] = put_vp8_epel16_h6_altivec;
+    c->put_vp8_epel_pixels_tab[0][2][0] = put_vp8_epel16_v6_altivec;
+    c->put_vp8_epel_pixels_tab[0][2][2] = put_vp8_epel16_h6v6_altivec;
+
+    c->put_vp8_epel_pixels_tab[1][0][2] = put_vp8_epel8_h6_altivec;
+    c->put_vp8_epel_pixels_tab[1][2][0] = put_vp8_epel8_v6_altivec;
+    c->put_vp8_epel_pixels_tab[1][0][1] = put_vp8_epel8_h4_altivec;
+    c->put_vp8_epel_pixels_tab[1][1][0] = put_vp8_epel8_v4_altivec;
+
+    c->put_vp8_epel_pixels_tab[1][2][2] = put_vp8_epel8_h6v6_altivec;
+    c->put_vp8_epel_pixels_tab[1][1][1] = put_vp8_epel8_h4v4_altivec;
+    c->put_vp8_epel_pixels_tab[1][1][2] = put_vp8_epel8_h6v4_altivec;
+    c->put_vp8_epel_pixels_tab[1][2][1] = put_vp8_epel8_h4v6_altivec;
+
+    c->put_vp8_epel_pixels_tab[2][0][2] = put_vp8_epel4_h6_altivec;
+    c->put_vp8_epel_pixels_tab[2][2][0] = put_vp8_epel4_v6_altivec;
+    c->put_vp8_epel_pixels_tab[2][0][1] = put_vp8_epel4_h4_altivec;
+    c->put_vp8_epel_pixels_tab[2][1][0] = put_vp8_epel4_v4_altivec;
+
+    c->put_vp8_epel_pixels_tab[2][2][2] = put_vp8_epel4_h6v6_altivec;
+    c->put_vp8_epel_pixels_tab[2][1][1] = put_vp8_epel4_h4v4_altivec;
+    c->put_vp8_epel_pixels_tab[2][1][2] = put_vp8_epel4_h6v4_altivec;
+    c->put_vp8_epel_pixels_tab[2][2][1] = put_vp8_epel4_h4v6_altivec;
+}