From f2a4ff0e078fd26bd3cfc8707515ffec71b234eb Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Wed, 11 May 2022 17:24:49 +0800
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Subject: [PATCH 8/8] v4l2src: Support setting max resolution
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Set env "GST_V4L2SRC_MAX_RESOLUTION" to limit resolution, for example:
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export GST_V4L2SRC_MAX_RESOLUTION=1920x1080
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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sys/v4l2/gstv4l2object.c | 19 +++++++++++++------
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1 file changed, 13 insertions(+), 6 deletions(-)
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diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
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index a7b7ea7..fd1909d 100644
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--- a/sys/v4l2/gstv4l2object.c
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+++ b/sys/v4l2/gstv4l2object.c
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@@ -2770,6 +2770,7 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
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gint fd = v4l2object->video_fd;
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struct v4l2_frmsizeenum size;
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GList *results = NULL;
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+ guint32 max_width = G_MAXINT, max_height = G_MAXINT;
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guint32 w, h;
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if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')) {
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@@ -2777,6 +2778,12 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
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return ret;
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}
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+ if (!V4L2_TYPE_IS_OUTPUT (v4l2object->type)) {
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+ const gchar *buf = g_getenv ("GST_V4L2SRC_MAX_RESOLUTION");
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+ if (buf)
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+ sscanf (buf, "%ux%u", &max_width, &max_height);
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+ }
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+
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memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
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size.index = 0;
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size.pixel_format = pixelformat;
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@@ -2793,8 +2800,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
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GST_LOG_OBJECT (v4l2object->dbg_obj, "got discrete frame size %dx%d",
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size.discrete.width, size.discrete.height);
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- w = MIN (size.discrete.width, G_MAXINT);
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- h = MIN (size.discrete.height, G_MAXINT);
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+ w = MIN (size.discrete.width, max_width);
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+ h = MIN (size.discrete.height, max_height);
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if (w && h) {
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tmp =
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@@ -2828,8 +2835,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
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w = MAX (size.stepwise.min_width, 1);
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h = MAX (size.stepwise.min_height, 1);
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- maxw = MIN (size.stepwise.max_width, G_MAXINT);
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- maxh = MIN (size.stepwise.max_height, G_MAXINT);
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+ maxw = MIN (size.stepwise.max_width, max_width);
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+ maxh = MIN (size.stepwise.max_height, max_height);
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step_w = MAX (size.stepwise.step_width, 1);
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step_h = MAX (size.stepwise.step_height, 1);
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@@ -2869,8 +2876,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
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w = MAX (size.stepwise.min_width, 1);
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h = MAX (size.stepwise.min_height, 1);
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- maxw = MIN (size.stepwise.max_width, G_MAXINT);
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- maxh = MIN (size.stepwise.max_height, G_MAXINT);
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+ maxw = MIN (size.stepwise.max_width, max_width);
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+ maxh = MIN (size.stepwise.max_height, max_height);
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tmp =
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gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat,
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--
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2.20.1
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