avfilter: add vf_overlay_cuda

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/libavfilter/vf_overlay_cuda.cu b/libavfilter/vf_overlay_cuda.cu
new file mode 100644
index 0000000000..43ec36c2ed
--- /dev/null
+++ b/libavfilter/vf_overlay_cuda.cu
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020 Yaroslav Pogrebnyak <yyyaroslav@gmail.com>
+ *
+ * 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
+ */
+
+extern "C" {
+
+__global__ void Overlay_Cuda(
+    int x_position, int y_position,
+    unsigned char* main, int main_linesize,
+    unsigned char* overlay, int overlay_linesize,
+    int overlay_w, int overlay_h,
+    unsigned char* overlay_alpha, int alpha_linesize,
+    int alpha_adj_x, int alpha_adj_y)
+{
+    int x = blockIdx.x * blockDim.x + threadIdx.x;
+    int y = blockIdx.y * blockDim.y + threadIdx.y;
+
+    if (x >= overlay_w + x_position ||
+        y >= overlay_h + y_position ||
+        x < x_position ||
+        y < y_position ) {
+
+        return;
+    }
+
+    int overlay_x = x - x_position;
+    int overlay_y = y - y_position;
+
+    float alpha = 1.0;
+    if (alpha_linesize) {
+        alpha = overlay_alpha[alpha_adj_x * overlay_x  + alpha_adj_y * overlay_y * alpha_linesize] / 255.0f;
+    }
+
+    main[x + y*main_linesize] = alpha * overlay[overlay_x + overlay_y * overlay_linesize] + (1.0f - alpha) * main[x + y*main_linesize];
+}
+
+}
+