swscale/ppc: Move VSX-using code to its own file

Passes fate on LE (with "lavc/jrevdct: Avoid an aliasing violation" applied).

Signed-off-by: Lauri Kasanen <cand@gmx.com>
Tested-by: Michael Kostylev on BE
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 164 insertions, 0 deletions

diff --git a/libswscale/ppc/swscale_vsx.c b/libswscale/ppc/swscale_vsx.c
new file mode 100644
index 0000000000..853b5875ec
--- /dev/null
+++ b/libswscale/ppc/swscale_vsx.c
@@ -0,0 +1,164 @@
+/*
+ * AltiVec-enhanced yuv2yuvX
+ *
+ * Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
+ * based on the equivalent C code in swscale.c
+ *
+ * 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 <inttypes.h>
+
+#include "config.h"
+#include "libswscale/swscale.h"
+#include "libswscale/swscale_internal.h"
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "yuv2rgb_altivec.h"
+#include "libavutil/ppc/util_altivec.h"
+
+#if HAVE_VSX
+#define vzero vec_splat_s32(0)
+
+#if !HAVE_BIGENDIAN
+#define  GET_LS(a,b,c,s) {\
+        ls  = a;\
+        a = vec_vsx_ld(((b) << 1)  + 16, s);\
+    }
+
+#define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do {\
+        vector signed short ls;\
+        GET_LS(l1, x, perm, src);\
+        vector signed int   i1  = vec_mule(filter, ls);\
+        vector signed int   i2  = vec_mulo(filter, ls);\
+        vector signed int   vf1, vf2;\
+        vf1 = vec_mergeh(i1, i2);\
+        vf2 = vec_mergel(i1, i2);\
+        d1 = vec_add(d1, vf1);\
+        d2 = vec_add(d2, vf2);\
+    } while (0)
+
+#define LOAD_FILTER(vf,f) {\
+        vf = vec_vsx_ld(joffset, f);\
+}
+#define LOAD_L1(ll1,s,p){\
+        ll1  = vec_vsx_ld(xoffset, s);\
+}
+
+// The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
+
+// The neat trick: We only care for half the elements,
+// high or low depending on (i<<3)%16 (it's 0 or 8 here),
+// and we're going to use vec_mule, so we choose
+// carefully how to "unpack" the elements into the even slots.
+#define GET_VF4(a, vf, f) {\
+    vf = (vector signed short)vec_vsx_ld(a << 3, f);\
+    vf = vec_mergeh(vf, (vector signed short)vzero);\
+}
+#define FIRST_LOAD(sv, pos, s, per) {}
+#define UPDATE_PTR(s0, d0, s1, d1) {}
+#define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
+    vf = vec_vsx_ld(pos + a, s);\
+}
+#define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) LOAD_SRCV(pos, a, s, per, v0, v1, vf)
+#define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
+    vf  = vec_vsx_ld((a * 2 * filterSize) + (b * 2) + off, f);\
+}
+
+#define FUNC(name) name ## _vsx
+#include "swscale_ppc_template.c"
+#undef FUNC
+
+#endif /* !HAVE_BIGENDIAN */
+
+static void yuv2plane1_8_u(const int16_t *src, uint8_t *dest, int dstW,
+                           const uint8_t *dither, int offset, int start)
+{
+    int i;
+    for (i = start; i < dstW; i++) {
+        int val = (src[i] + dither[(i + offset) & 7]) >> 7;
+        dest[i] = av_clip_uint8(val);
+    }
+}
+
+static void yuv2plane1_8_vsx(const int16_t *src, uint8_t *dest, int dstW,
+                           const uint8_t *dither, int offset)
+{
+    const int dst_u = -(uintptr_t)dest & 15;
+    int i, j;
+    LOCAL_ALIGNED(16, int16_t, val, [16]);
+    const vector uint16_t shifts = (vector uint16_t) {7, 7, 7, 7, 7, 7, 7, 7};
+    vector int16_t vi, vileft, ditherleft, ditherright;
+    vector uint8_t vd;
+
+    for (j = 0; j < 16; j++) {
+        val[j] = dither[(dst_u + offset + j) & 7];
+    }
+
+    ditherleft = vec_ld(0, val);
+    ditherright = vec_ld(0, &val[8]);
+
+    yuv2plane1_8_u(src, dest, dst_u, dither, offset, 0);
+
+    for (i = dst_u; i < dstW - 15; i += 16) {
+
+        vi = vec_vsx_ld(0, &src[i]);
+        vi = vec_adds(ditherleft, vi);
+        vileft = vec_sra(vi, shifts);
+
+        vi = vec_vsx_ld(0, &src[i + 8]);
+        vi = vec_adds(ditherright, vi);
+        vi = vec_sra(vi, shifts);
+
+        vd = vec_packsu(vileft, vi);
+        vec_st(vd, 0, &dest[i]);
+    }
+
+    yuv2plane1_8_u(src, dest, dstW, dither, offset, i);
+}
+
+#endif /* HAVE_VSX */
+
+av_cold void ff_sws_init_swscale_vsx(SwsContext *c)
+{
+#if HAVE_VSX
+    enum AVPixelFormat dstFormat = c->dstFormat;
+
+    if (!(av_get_cpu_flags() & AV_CPU_FLAG_VSX))
+        return;
+
+#if !HAVE_BIGENDIAN
+    if (c->srcBpc == 8 && c->dstBpc <= 14) {
+        c->hyScale = c->hcScale = hScale_real_vsx;
+    }
+    if (!is16BPS(dstFormat) && !isNBPS(dstFormat) &&
+        dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
+        dstFormat != AV_PIX_FMT_GRAYF32BE && dstFormat != AV_PIX_FMT_GRAYF32LE &&
+        !c->needAlpha) {
+        c->yuv2planeX = yuv2planeX_vsx;
+    }
+#endif
+
+    if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->needAlpha) {
+        switch (c->dstBpc) {
+        case 8:
+            c->yuv2plane1 = yuv2plane1_8_vsx;
+            break;
+        }
+    }
+#endif /* HAVE_VSX */
+}