dsputil: Split off global motion compensation bits into a separate context

1 files changed, 119 insertions, 0 deletions

diff --git a/libavcodec/mpegvideodsp.c b/libavcodec/mpegvideodsp.c
new file mode 100644
index 0000000000..915a844d6b
--- /dev/null
+++ b/libavcodec/mpegvideodsp.c
@@ -0,0 +1,119 @@
+/*
+ * 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"
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "mpegvideodsp.h"
+
+static void gmc1_c(uint8_t *dst, uint8_t *src, int stride, int h,
+                   int x16, int y16, int rounder)
+{
+    const int A = (16 - x16) * (16 - y16);
+    const int B = (x16)      * (16 - y16);
+    const int C = (16 - x16) * (y16);
+    const int D = (x16)      * (y16);
+    int i;
+
+    for (i = 0; i < h; i++) {
+        dst[0] = (A * src[0] + B * src[1] + C * src[stride + 0] + D * src[stride + 1] + rounder) >> 8;
+        dst[1] = (A * src[1] + B * src[2] + C * src[stride + 1] + D * src[stride + 2] + rounder) >> 8;
+        dst[2] = (A * src[2] + B * src[3] + C * src[stride + 2] + D * src[stride + 3] + rounder) >> 8;
+        dst[3] = (A * src[3] + B * src[4] + C * src[stride + 3] + D * src[stride + 4] + rounder) >> 8;
+        dst[4] = (A * src[4] + B * src[5] + C * src[stride + 4] + D * src[stride + 5] + rounder) >> 8;
+        dst[5] = (A * src[5] + B * src[6] + C * src[stride + 5] + D * src[stride + 6] + rounder) >> 8;
+        dst[6] = (A * src[6] + B * src[7] + C * src[stride + 6] + D * src[stride + 7] + rounder) >> 8;
+        dst[7] = (A * src[7] + B * src[8] + C * src[stride + 7] + D * src[stride + 8] + rounder) >> 8;
+        dst   += stride;
+        src   += stride;
+    }
+}
+
+void ff_gmc_c(uint8_t *dst, uint8_t *src, int stride, int h, int ox, int oy,
+              int dxx, int dxy, int dyx, int dyy, int shift, int r,
+              int width, int height)
+{
+    int y, vx, vy;
+    const int s = 1 << shift;
+
+    width--;
+    height--;
+
+    for (y = 0; y < h; y++) {
+        int x;
+
+        vx = ox;
+        vy = oy;
+        for (x = 0; x < 8; x++) { // FIXME: optimize
+            int index;
+            int src_x  = vx >> 16;
+            int src_y  = vy >> 16;
+            int frac_x = src_x & (s - 1);
+            int frac_y = src_y & (s - 1);
+
+            src_x >>= shift;
+            src_y >>= shift;
+
+            if ((unsigned) src_x < width) {
+                if ((unsigned) src_y < height) {
+                    index = src_x + src_y * stride;
+                    dst[y * stride + x] =
+                        ((src[index]                        * (s - frac_x) +
+                          src[index + 1]          * frac_x) * (s - frac_y) +
+                         (src[index + stride]               * (s - frac_x) +
+                          src[index + stride + 1] * frac_x) *      frac_y  +
+                         r) >> (shift * 2);
+                } else {
+                    index = src_x + av_clip(src_y, 0, height) * stride;
+                    dst[y * stride + x] =
+                        ((src[index]               * (s - frac_x) +
+                          src[index + 1] * frac_x) *  s           +
+                         r) >> (shift * 2);
+                }
+            } else {
+                if ((unsigned) src_y < height) {
+                    index = av_clip(src_x, 0, width) + src_y * stride;
+                    dst[y * stride + x] =
+                        ((src[index]                    * (s - frac_y) +
+                          src[index + stride] * frac_y) *  s           +
+                         r) >> (shift * 2);
+                } else {
+                    index = av_clip(src_x, 0, width) +
+                            av_clip(src_y, 0, height) * stride;
+                    dst[y * stride + x] = src[index];
+                }
+            }
+
+            vx += dxx;
+            vy += dyx;
+        }
+        ox += dxy;
+        oy += dyy;
+    }
+}
+
+av_cold void ff_mpegvideodsp_init(MpegVideoDSPContext *c)
+{
+    c->gmc1 = gmc1_c;
+    c->gmc  = ff_gmc_c;
+
+    if (ARCH_PPC)
+        ff_mpegvideodsp_init_ppc(c);
+    if (ARCH_X86)
+        ff_mpegvideodsp_init_x86(c);
+}