1 files changed, 85 insertions, 0 deletions
diff --git a/stan/v4l2-decode/tracer.c b/stan/v4l2-decode/tracer.c
new file mode 100644
index 0000000..a320103
--- /dev/null
+++ b/stan/v4l2-decode/tracer.c
@@ -0,0 +1,85 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "tracer.h"
+#include "common.h"
+
+int tracer_init(struct instance *i)
+{
+	i->stats = calloc(STAT_BUFS, sizeof(struct buf_stats));
+	if (!i->stats)
+		return -1;
+
+	return 0;
+}
+
+void tracer_deinit(struct instance *i)
+{
+	if (i->stats)
+		free(i->stats);
+}
+
+void tracer_buf_start(struct instance *i, unsigned int type)
+{
+	struct buf_stats *stats = i->stats;
+
+	if (stats->dqbuf_counter >= STAT_BUFS ||
+	    stats->qbuf_counter >= STAT_BUFS)
+		return;
+
+	if (stats->dqbuf_counter == 0)
+		gettimeofday(&stats->start, NULL);
+
+	if (type == TYPE_DQBUF)
+		gettimeofday(&stats[stats->dqbuf_counter].dqbuf_start, NULL);
+	else
+		gettimeofday(&stats[stats->qbuf_counter].qbuf_start, NULL);
+}
+
+void tracer_buf_finish(struct instance *i, unsigned int type)
+{
+	struct buf_stats *stats = i->stats;
+
+	if (stats->dqbuf_counter >= STAT_BUFS ||
+	    stats->qbuf_counter >= STAT_BUFS)
+		return;
+
+	if (type == TYPE_DQBUF) {
+		gettimeofday(&stats[stats->dqbuf_counter].dqbuf_end, NULL);
+		stats->dqbuf_counter++;
+	} else {
+		gettimeofday(&stats[stats->qbuf_counter].qbuf_end, NULL);
+		stats->qbuf_counter++;
+	}
+
+	gettimeofday(&stats->end, NULL);
+}
+
+void tracer_show(struct instance *inst)
+{
+	struct buf_stats *stats = inst->stats;
+	unsigned long long delta, time, fps;
+	unsigned int last = stats->dqbuf_counter - 1;
+
+	delta = (stats[last].dqbuf_end.tv_sec * 1000000 +
+		 stats[last].dqbuf_end.tv_usec);
+
+	delta -=(stats[0].dqbuf_end.tv_sec * 1000000 +
+		 stats[0].dqbuf_end.tv_usec);
+
+	time = delta / last; /* time per frame in us */
+	fps = 1000000 / time;
+
+	fprintf(stdout, "%lld fps (%lld ms)\n", fps, time / 1000);
+
+	time = stats->end.tv_sec * 1000000 + stats->end.tv_usec;
+	time -= stats->start.tv_sec * 1000000 + stats->start.tv_usec;
+
+	fprintf(stdout, "total time %lld ms (%lld)\n", time / 1000,
+		last * 1000000 / time);
+}