From 7a847adfb41352466475428c61e85807ca4d25b8 Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
Date: Mon, 15 Aug 2011 15:56:57 +0200
Subject: Add temporal weave de-interlacer

---
 deinterlace.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/deinterlace.c b/deinterlace.c
index a7a81aa..07009dc 100644
--- a/deinterlace.c
+++ b/deinterlace.c
@@ -17,7 +17,7 @@ char *strdup(const char *str)
     return dup;
 }
 
-int process_simple_frame(uint16_t *frame_in, uint16_t *frame_out, int width, int height)
+int process_simple_frame(const uint16_t *frame_in, uint16_t *frame_out, int width, int height)
 {
     const size_t row_size_bytes = width * sizeof(uint16_t);
 
@@ -38,6 +38,19 @@ int process_simple_frame(uint16_t *frame_in, uint16_t *frame_out, int width, int
     return 0;
 }
 
+int weave(const uint16_t *frames_in, uint16_t *frame_out, int width, int height)
+{
+    const size_t row_size_bytes = width * sizeof(uint16_t);
+    const size_t frame_offset = width * height;
+    for (int row = 0; row < height; row++) {
+        memcpy(frame_out, frames_in + row*width, row_size_bytes); 
+        frame_out += width;
+        memcpy(frame_out, frames_in + frame_offset + row*width, row_size_bytes); 
+        frame_out += width;
+    }
+    return 0;
+}
+
 int process_file(const char *filename, int width, int height, int num_lines_skipped)
 {
     FILE *fp = fopen(filename, "rb");
@@ -69,12 +82,19 @@ int process_file(const char *filename, int width, int height, int num_lines_skip
 
     const int num_frames = file_size / (width * height * sizeof(uint16_t));
     printf("de-interlacing %i frames...\n", num_frames);
+    /*
     for (int frame = 0; frame < num_frames; frame++) {
         process_simple_frame(
                 frame_in_buffer + frame * (width * height),
                 frame_out_buffer + frame * (width * height * 2),
                 width, height);
     }
+    */
+    for (int frame = 0; frame < num_frames-1; frame++) {
+        weave(frame_in_buffer + frame * (width * height),
+              frame_out_buffer + frame * (width * height * 2),
+              width, height);
+    }
 
     fp = fopen("result.raw", "wb");
     fwrite(frame_out_buffer, 1, file_size * 2, fp);
@@ -133,3 +153,4 @@ int main(int argc, char const* argv[])
     free(file_name);
     return 0;
 }
+
-- 
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