early-access version 1432

externals/ffmpeg/libavcodec/lossless_videodsp.c

@@ -0,0 +1,125 @@
+/*
+ * Lossless video DSP utils
+ *
+ * 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 "avcodec.h"
+#include "lossless_videodsp.h"
+#include "libavcodec/mathops.h"
+
+// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
+#define pb_7f (~0UL / 255 * 0x7f)
+#define pb_80 (~0UL / 255 * 0x80)
+
+static void add_bytes_c(uint8_t *dst, uint8_t *src, ptrdiff_t w)
+{
+    long i;
+
+    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
+        long a = *(long *) (src + i);
+        long b = *(long *) (dst + i);
+        *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
+    }
+    for (; i < w; i++)
+        dst[i + 0] += src[i + 0];
+}
+
+static void add_median_pred_c(uint8_t *dst, const uint8_t *src1,
+                              const uint8_t *diff, ptrdiff_t w,
+                              int *left, int *left_top)
+{
+    int i;
+    uint8_t l, lt;
+
+    l  = *left;
+    lt = *left_top;
+
+    for (i = 0; i < w; i++) {
+        l      = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
+        lt     = src1[i];
+        dst[i] = l;
+    }
+
+    *left     = l;
+    *left_top = lt;
+}
+
+static int add_left_pred_c(uint8_t *dst, const uint8_t *src, ptrdiff_t w,
+                           int acc)
+{
+    int i;
+
+    for (i = 0; i < w - 1; i++) {
+        acc   += src[i];
+        dst[i] = acc;
+        i++;
+        acc   += src[i];
+        dst[i] = acc;
+    }
+
+    for (; i < w; i++) {
+        acc   += src[i];
+        dst[i] = acc;
+    }
+
+    return acc;
+}
+
+static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned acc){
+    int i;
+
+    for(i=0; i<w-1; i++){
+        acc+= src[i];
+        dst[i]= acc &= mask;
+        i++;
+        acc+= src[i];
+        dst[i]= acc &= mask;
+    }
+
+    for(; i<w; i++){
+        acc+= src[i];
+        dst[i]= acc &= mask;
+    }
+
+    return acc;
+}
+
+static void add_gradient_pred_c(uint8_t *src, const ptrdiff_t stride, const ptrdiff_t width){
+    int A, B, C, i;
+
+    for (i = 0; i < width; i++) {
+        A = src[i - stride];
+        B = src[i - (stride + 1)];
+        C = src[i - 1];
+        src[i] = (A - B + C + src[i]) & 0xFF;
+    }
+}
+
+void ff_llviddsp_init(LLVidDSPContext *c)
+{
+    c->add_bytes                  = add_bytes_c;
+    c->add_median_pred            = add_median_pred_c;
+    c->add_left_pred              = add_left_pred_c;
+
+    c->add_left_pred_int16        = add_left_pred_int16_c;
+    c->add_gradient_pred          = add_gradient_pred_c;
+
+    if (ARCH_PPC)
+        ff_llviddsp_init_ppc(c);
+    if (ARCH_X86)
+        ff_llviddsp_init_x86(c);
+}