dnn: add layer pad which is equivalent to tf.pad

the reason to add this layer first is that vf_sr uses it in its
tensorflow model, and the next plan is to update the python script
to convert tf.pad into native model.

Signed-off-by: Guo, Yejun <yejun.guo@intel.com>
Signed-off-by: Pedro Arthur <bygrandao@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/libavfilter/dnn/dnn_backend_native_layer_pad.h b/libavfilter/dnn/dnn_backend_native_layer_pad.h
new file mode 100644
index 0000000000..0fbe652202
--- /dev/null
+++ b/libavfilter/dnn/dnn_backend_native_layer_pad.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019 Guo Yejun
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * layer pad (equivalent to tf.pad) for native backend.
+ */
+#ifndef AVFILTER_DNN_DNN_BACKEND_NATIVE_LAYER_PAD_H
+#define AVFILTER_DNN_DNN_BACKEND_NATIVE_LAYER_PAD_H
+
+#include <stdint.h>
+
+typedef enum {LPMP_CONSTANT, LPMP_REFLECT, LPMP_SYMMETRIC} LayerPadModeParam;
+
+typedef struct LayerPadParams{
+    int32_t paddings[4][2];
+    LayerPadModeParam mode;
+    float constant_values;
+} LayerPadParams;
+
+void dnn_execute_layer_pad(const float *input, float *output, const LayerPadParams *params, int number, int height, int width, int channel);
+
+#endif