From c7c47cdf23892f7209bbd2acaf420a8d34336406 Mon Sep 17 00:00:00 2001
From: Jan Klemkow <j.klemkow@wemelug.de>
Date: Thu, 15 Nov 2012 08:25:35 +0100
Subject: Add frame mix saving for high diffs.

---
 src/Makefile  | 11 +++++++----
 src/advtime.c | 25 ++++++++++++++++++++++---
 src/util.c    | 32 ++++++++++++++++++++++++++++++++
 src/util.h    |  3 +++
 4 files changed, 64 insertions(+), 7 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index 43087cb..83892e7 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,10 +1,13 @@
-CFLAGS=-std=c99 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wno-unused-parameter
-LIBAV_DECODE_FLAGS=`pkg-config --libs --cflags libavformat libavcodec libavutil libswscale`
+CFLAGS=-std=c99 -Wall -Wstrict-prototypes -Wmissing-prototypes \
+	-Wno-unused-parameter
+LIBAV_DECODE_FLAGS=`pkg-config --libs --cflags libavformat libavcodec \
+	 libavutil libswscale`
 
 all: advtime decode_frame frame_to_pgm
 
-advtime: advtime.c video_decode.c
-	gcc $(CFLAGS) $(LIBAV_DECODE_FLAGS) -DDEBUG=0 advtime.c video_decode.c -o $@
+advtime: advtime.c video_decode.c util.c
+	gcc $(CFLAGS) $(LIBAV_DECODE_FLAGS) -DDEBUG=0 advtime.c video_decode.c \
+		util.c -o $@
 
 decode_frame: decode_frame.c
 	gcc $(CFLAGS) $(LIBAV_DECODE_FLAGS) decode_frame.c -o $@
diff --git a/src/advtime.c b/src/advtime.c
index 6144cc3..217b7ed 100644
--- a/src/advtime.c
+++ b/src/advtime.c
@@ -5,6 +5,7 @@
 #include <unistd.h>
 
 #include "video_decode.h"
+#include "util.h"
 
 static double
 frame_diff(struct video_frame *frame_a, struct video_frame *frame_b)
@@ -63,6 +64,8 @@ main(int argc, char **argv)
 	int ret, ch;
 	int diff_flag = 0, average_flag = 0;
 	int64_t timestamp = 0;
+	double diff = 0.0;
+	char filename[BUFSIZ];
 
 	while ((ch = getopt(argc, argv, "ad")) != -1) {
 		switch (ch) {
@@ -94,11 +97,27 @@ main(int argc, char **argv)
 	if (ret < 0)
 		return -ret;
 
-	while (video_decode_get_frame(vd, &frame_b) == 0) {
+	for (int i = 0; video_decode_get_frame(vd, &frame_b) == 0; ++i) {
+
+		printf("%d\t", i);
+
 		if (average_flag == 1)
-			printf("%f\n", frame_average(frame_a));
+			printf("%f", frame_average(frame_a));
+
+		if (average_flag == 1 && diff_flag == 1)
+			printf("\t");
+
 		if (diff_flag == 1)
-			printf("%f\n", frame_diff(frame_a, frame_b));
+			printf("%f", diff = frame_diff(frame_a, frame_b));
+
+		if (diff > 40.0) {
+			snprintf(filename, BUFSIZ, "img/%04i.pgm", i);
+			frame_mix_pgm_save(frame_a, frame_b, filename);
+//			pgm_save(frame_a->data, frame_a->stride, frame_a->width,
+//				frame_a->height, filename);
+		}
+
+		printf("\n");
 		video_decode_free_frame(&frame_a);
 		frame_a = frame_b;
 	}
diff --git a/src/util.c b/src/util.c
index bd4b7b8..4e496a4 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1,3 +1,8 @@
+#include <stdio.h>
+
+#include "video_decode.h"
+#include "util.h"
+
 void
 pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename)
 {
@@ -10,3 +15,30 @@ pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename)
 		fwrite(buf + i * wrap, 1, xsize, f);
 	fclose(f);
 }
+
+void
+frame_mix_pgm_save(struct video_frame *frame_a, struct video_frame *frame_b,
+	char *filename)
+{
+        uint8_t *row_a = frame_a->data, *col_a = NULL;
+        uint8_t *row_b = frame_b->data, *col_b = NULL;
+
+        for (int y = 0; y < frame_a->height; ++y) {
+                col_a = row_a;
+                col_b = row_b;
+                for (int x = 0; x < frame_a->width; ++x) {
+			if (x > frame_a->width / 2)
+	                        *col_a = *col_b;
+                        col_a++;
+                        col_b++;
+                }
+                row_a += frame_a->stride;
+                row_b += frame_b->stride;
+        }
+
+	FILE *f = fopen(filename, "w");
+	fprintf(f, "P5\n%d %d\n%d\n", frame_a->width, frame_a->height, 255);
+	for (int i = 0; i < frame_a->height; i++)
+		fwrite(frame_a->data+i*frame_a->stride, 1, frame_a->width, f);
+	fclose(f);
+}
diff --git a/src/util.h b/src/util.h
index a58585e..e6f9bcf 100644
--- a/src/util.h
+++ b/src/util.h
@@ -3,5 +3,8 @@
 
 void
 pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename);
+void
+frame_mix_pgm_save(struct video_frame *frame_a, struct video_frame *frame_b,
+        char *filename);
 
 #endif /* _UTIL_H_ */
-- 
cgit