From 1471364ed1fb2087b0a8febfde02b68c6dd6886a Mon Sep 17 00:00:00 2001 From: Jeffy Chen Date: Wed, 11 May 2022 17:24:49 +0800 Subject: [PATCH 8/8] v4l2src: Support setting max resolution Set env "GST_V4L2SRC_MAX_RESOLUTION" to limit resolution, for example: export GST_V4L2SRC_MAX_RESOLUTION=1920x1080 Signed-off-by: Jeffy Chen --- sys/v4l2/gstv4l2object.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c index ad091ad..815e059 100644 --- a/sys/v4l2/gstv4l2object.c +++ b/sys/v4l2/gstv4l2object.c @@ -2747,6 +2747,7 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, gint fd = v4l2object->video_fd; struct v4l2_frmsizeenum size; GList *results = NULL; + guint32 max_width = G_MAXINT, max_height = G_MAXINT; guint32 w, h; if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')) { @@ -2754,6 +2755,12 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, return ret; } + if (!V4L2_TYPE_IS_OUTPUT (v4l2object->type)) { + const gchar *buf = g_getenv ("GST_V4L2SRC_MAX_RESOLUTION"); + if (buf) + sscanf (buf, "%ux%u", &max_width, &max_height); + } + memset (&size, 0, sizeof (struct v4l2_frmsizeenum)); size.index = 0; size.pixel_format = pixelformat; @@ -2770,8 +2777,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, GST_LOG_OBJECT (v4l2object->dbg_obj, "got discrete frame size %dx%d", size.discrete.width, size.discrete.height); - w = MIN (size.discrete.width, G_MAXINT); - h = MIN (size.discrete.height, G_MAXINT); + w = MIN (size.discrete.width, max_width); + h = MIN (size.discrete.height, max_height); if (w && h) { tmp = @@ -2805,8 +2812,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, w = MAX (size.stepwise.min_width, 1); h = MAX (size.stepwise.min_height, 1); - maxw = MIN (size.stepwise.max_width, G_MAXINT); - maxh = MIN (size.stepwise.max_height, G_MAXINT); + maxw = MIN (size.stepwise.max_width, max_width); + maxh = MIN (size.stepwise.max_height, max_height); step_w = MAX (size.stepwise.step_width, 1); step_h = MAX (size.stepwise.step_height, 1); @@ -2846,8 +2853,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, w = MAX (size.stepwise.min_width, 1); h = MAX (size.stepwise.min_height, 1); - maxw = MIN (size.stepwise.max_width, G_MAXINT); - maxh = MIN (size.stepwise.max_height, G_MAXINT); + maxw = MIN (size.stepwise.max_width, max_width); + maxh = MIN (size.stepwise.max_height, max_height); tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, -- 2.20.1