From 4ed77bee3712e7209e2dbc56765b69625b5fe28f Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Wed, 27 Jan 2021 10:11:38 +0100
Subject: [PATCH] Added stripe capture filter [VR]

---
 Makefile.in                 |   1 +
 src/capture_filter/stripe.c | 117 ++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 src/capture_filter/stripe.c

diff --git a/Makefile.in b/Makefile.in
index ab6bcc6fe..90ee9de86 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -110,6 +110,7 @@ COMMON_OBJS     = \
 		src/capture_filter/mirror.o \
 		src/capture_filter/none.o \
 		src/capture_filter/split.o \
+		src/capture_filter/stripe.o \
 		src/compat/alarm.o \
 		src/compat/drand48.o \
 		src/compat/gettimeofday.o \
diff --git a/src/capture_filter/stripe.c b/src/capture_filter/stripe.c
new file mode 100644
index 000000000..8f9653933
--- /dev/null
+++ b/src/capture_filter/stripe.c
@@ -0,0 +1,117 @@
+/**
+ * @file   capture_filter/stripe.c
+ * @author Martin Pulec     <pulec@cesnet.cz>
+ */
+/*
+ * Copyright (c) 2021 CESNET, z. s. p. o.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, is permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of CESNET nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#include "config_unix.h"
+#include "config_win32.h"
+#endif /* HAVE_CONFIG_H */
+
+#include "capture_filter.h"
+
+#include "debug.h"
+#include "lib_common.h"
+
+#include "video.h"
+#include "video_codec.h"
+
+#define FACTOR 8
+
+struct module;
+
+static int init(struct module *parent, const char *cfg, void **state);
+static void done(void *state);
+static struct video_frame *filter(void *state, struct video_frame *in);
+
+static int state_stripe;
+
+static void usage() {
+        printf("Strip frame by 8\n\n");
+        printf("Usage:\n");
+        printf("\tstripe\n\n");
+        printf("Example: stripe - divide width by 8, multiply height by 8\n");
+}
+
+static int init(struct module *parent, const char *cfg, void **state)
+{
+        UNUSED(parent);
+
+        if (cfg && strlen(cfg) > 0) {
+                usage();
+                return 1;
+        }
+
+        *state = &state_stripe;
+        return 0;
+}
+
+static void done(void *state)
+{
+        assert(state == &state_stripe);
+}
+
+static struct video_frame *filter(void *state, struct video_frame *in)
+{
+        assert(state == &state_stripe);
+        struct video_desc desc = video_desc_from_frame(in);
+        desc.width /= FACTOR;
+        desc.height *= FACTOR;
+        struct video_frame *out = vf_alloc_desc_data(desc);
+
+        out->callbacks.dispose = vf_free;
+
+        int in_linesize = vc_get_linesize(in->tiles[0].width, out->color_spec);
+        int out_linesize = vc_get_linesize(out->tiles[0].width, out->color_spec);
+        for (unsigned int y = 0; y < in->tiles[0].height; ++y) {
+                for (unsigned int i = 0; i < FACTOR; ++i) {
+                        memcpy(out->tiles[0].data + y * out_linesize + i * out_linesize * in->tiles[0].height, in->tiles[0].data + y * in_linesize + i * out_linesize, out_linesize);
+                }
+        }
+
+        VIDEO_FRAME_DISPOSE(in);
+
+        return out;
+}
+
+static const struct capture_filter_info capture_filter_stripe = {
+        .init = init,
+        .done = done,
+        .filter = filter,
+};
+
+REGISTER_MODULE(stripe, &capture_filter_stripe, LIBRARY_CLASS_CAPTURE_FILTER, CAPTURE_FILTER_ABI_VERSION);
+