dsputil: Split off pixel block routines into their own context

1 files changed, 153 insertions, 0 deletions

diff --git a/libavcodec/ppc/pixblockdsp.c b/libavcodec/ppc/pixblockdsp.c
new file mode 100644
index 0000000000..698d655fc6
--- /dev/null
+++ b/libavcodec/ppc/pixblockdsp.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2002 Brian Foley
+ * Copyright (c) 2002 Dieter Shirley
+ * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>
+ *
+ * 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
+ */
+
+#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 "libavutil/ppc/util_altivec.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/pixblockdsp.h"
+
+#if HAVE_ALTIVEC
+
+static void get_pixels_altivec(int16_t *restrict block, const uint8_t *pixels,
+                               int line_size)
+{
+    int i;
+    vector unsigned char perm = vec_lvsl(0, pixels);
+    const vector unsigned char zero =
+        (const vector unsigned char) vec_splat_u8(0);
+
+    for (i = 0; i < 8; i++) {
+        /* Read potentially unaligned pixels.
+         * We're reading 16 pixels, and actually only want 8,
+         * but we simply ignore the extras. */
+        vector unsigned char pixl = vec_ld(0, pixels);
+        vector unsigned char pixr = vec_ld(7, pixels);
+        vector unsigned char bytes = vec_perm(pixl, pixr, perm);
+
+        // Convert the bytes into shorts.
+        vector signed short shorts = (vector signed short) vec_mergeh(zero,
+                                                                      bytes);
+
+        // Save the data to the block, we assume the block is 16-byte aligned.
+        vec_st(shorts, i * 16, (vector signed short *) block);
+
+        pixels += line_size;
+    }
+}
+
+static void diff_pixels_altivec(int16_t *restrict block, const uint8_t *s1,
+                                const uint8_t *s2, int stride)
+{
+    int i;
+    vector unsigned char perm1 = vec_lvsl(0, s1);
+    vector unsigned char perm2 = vec_lvsl(0, s2);
+    const vector unsigned char zero =
+        (const vector unsigned char) vec_splat_u8(0);
+    vector signed short shorts1, shorts2;
+
+    for (i = 0; i < 4; i++) {
+        /* Read potentially unaligned pixels.
+         * We're reading 16 pixels, and actually only want 8,
+         * but we simply ignore the extras. */
+        vector unsigned char pixl  = vec_ld(0,  s1);
+        vector unsigned char pixr  = vec_ld(15, s1);
+        vector unsigned char bytes = vec_perm(pixl, pixr, perm1);
+
+        // Convert the bytes into shorts.
+        shorts1 = (vector signed short) vec_mergeh(zero, bytes);
+
+        // Do the same for the second block of pixels.
+        pixl  = vec_ld(0,  s2);
+        pixr  = vec_ld(15, s2);
+        bytes = vec_perm(pixl, pixr, perm2);
+
+        // Convert the bytes into shorts.
+        shorts2 = (vector signed short) vec_mergeh(zero, bytes);
+
+        // Do the subtraction.
+        shorts1 = vec_sub(shorts1, shorts2);
+
+        // Save the data to the block, we assume the block is 16-byte aligned.
+        vec_st(shorts1, 0, (vector signed short *) block);
+
+        s1    += stride;
+        s2    += stride;
+        block += 8;
+
+        /* The code below is a copy of the code above...
+         * This is a manual unroll. */
+
+        /* Read potentially unaligned pixels.
+         * We're reading 16 pixels, and actually only want 8,
+         * but we simply ignore the extras. */
+        pixl  = vec_ld(0,  s1);
+        pixr  = vec_ld(15, s1);
+        bytes = vec_perm(pixl, pixr, perm1);
+
+        // Convert the bytes into shorts.
+        shorts1 = (vector signed short) vec_mergeh(zero, bytes);
+
+        // Do the same for the second block of pixels.
+        pixl  = vec_ld(0,  s2);
+        pixr  = vec_ld(15, s2);
+        bytes = vec_perm(pixl, pixr, perm2);
+
+        // Convert the bytes into shorts.
+        shorts2 = (vector signed short) vec_mergeh(zero, bytes);
+
+        // Do the subtraction.
+        shorts1 = vec_sub(shorts1, shorts2);
+
+        // Save the data to the block, we assume the block is 16-byte aligned.
+        vec_st(shorts1, 0, (vector signed short *) block);
+
+        s1    += stride;
+        s2    += stride;
+        block += 8;
+    }
+}
+
+#endif /* HAVE_ALTIVEC */
+
+av_cold void ff_pixblockdsp_init_ppc(PixblockDSPContext *c,
+                                     AVCodecContext *avctx,
+                                     unsigned high_bit_depth)
+{
+#if HAVE_ALTIVEC
+    if (!PPC_ALTIVEC(av_get_cpu_flags()))
+        return;
+
+    c->diff_pixels = diff_pixels_altivec;
+
+    if (!high_bit_depth) {
+        c->get_pixels = get_pixels_altivec;
+    }
+#endif /* HAVE_ALTIVEC */
+}