live: Make the number of video buffers configurable

The -b argument can be used to set the number of video display buffers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/videoout.c b/videoout.c
index f6fbbe7..f8b6be2 100644
--- a/videoout.c
+++ b/videoout.c
@@ -37,7 +37,7 @@
 #include "isp/v4l2.h"
 #include "isp/v4l2-pool.h"
 
-#define NUM_BUFFERS 3
+#define MAX_BUFFERS	16
 
 struct videoout
 {
@@ -47,12 +47,13 @@ struct videoout
 
 	int streaming;
 
-	int queued[NUM_BUFFERS];
+	int queued[MAX_BUFFERS];
 	int num_queued;
 };
 
 struct videoout *vo_init(const char *devname,
 			 const struct video_out_operations *ops,
+			 unsigned int buffers,
 			 unsigned int width, unsigned int height)
 {
 	struct v4l2_pix_format pixfmt;
@@ -110,7 +111,10 @@ struct videoout *vo_init(const char *devname,
 	}
 
 	/* Allocate buffers. */
-	vo->pool = v4l2_buffers_pool_new(NUM_BUFFERS);
+	if (buffers > MAX_BUFFERS)
+		buffers = MAX_BUFFERS;
+
+	vo->pool = v4l2_buffers_pool_new(buffers);
 	if (vo->pool == NULL) {
 		printf("error: unable to allocate buffers pool for display.\n");
 		goto error;