From aafad5206531efe5f2e810bb811933c423201a09 Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Thu, 23 Jun 2022 16:04:18 +0800
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Subject: [PATCH 11/11] v4l2: Support setting v4l2 min buffers
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Tested with:
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gst-launch-1.0 v4l2src min-buffers=32 ! waylandsink ts-offset=1000000000
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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 | 24 ++++++++++++++++++++++++
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sys/v4l2/gstv4l2object.h | 3 ++-
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2 files changed, 26 insertions(+), 1 deletion(-)
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diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
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index fd1909d01..13e75eef2 100644
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--- a/sys/v4l2/gstv4l2object.c
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+++ b/sys/v4l2/gstv4l2object.c
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@@ -56,6 +56,8 @@ GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
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#define ENCODED_BUFFER_SIZE (2 * 1024 * 1024)
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+static guint DEFAULT_PROP_MIN_BUFFERS = 0;
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+
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enum
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{
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PROP_0,
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@@ -307,6 +309,11 @@ void
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gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
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const char *default_device)
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{
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+ const gchar *buf = g_getenv ("GST_V4L2_MIN_BUFS");
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+
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+ if (buf)
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+ DEFAULT_PROP_MIN_BUFFERS = atoi (buf);
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+
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g_object_class_install_property (gobject_class, PROP_DEVICE,
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g_param_spec_string ("device", "Device", "Device location",
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default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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@@ -426,6 +433,12 @@ gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
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"When enabled, the pixel aspect ratio will be enforced", TRUE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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+ g_object_class_install_property (gobject_class, PROP_MIN_BUFFERS,
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+ g_param_spec_uint ("min-buffers", "Min buffers",
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+ "Override the driver's min buffers (0 means auto)",
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+ 0, VIDEO_MAX_FRAME, DEFAULT_PROP_MIN_BUFFERS,
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+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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+
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gst_type_mark_as_plugin_api (GST_TYPE_V4L2_DEVICE_FLAGS, 0);
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gst_type_mark_as_plugin_api (GST_TYPE_V4L2_TV_NORM, 0);
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gst_type_mark_as_plugin_api (GST_TYPE_V4L2_IO_MODE, 0);
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@@ -543,6 +556,8 @@ gst_v4l2_object_new (GstElement * element,
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v4l2object->munmap = munmap;
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}
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+ v4l2object->min_buffers = DEFAULT_PROP_MIN_BUFFERS;
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+
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return v4l2object;
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}
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@@ -713,6 +728,9 @@ gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
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case PROP_FORCE_ASPECT_RATIO:
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v4l2object->keep_aspect = g_value_get_boolean (value);
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break;
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+ case PROP_MIN_BUFFERS:
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+ v4l2object->min_buffers = g_value_get_uint (value);
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+ break;
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default:
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return FALSE;
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break;
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@@ -810,6 +828,9 @@ gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
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case PROP_FORCE_ASPECT_RATIO:
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g_value_set_boolean (value, v4l2object->keep_aspect);
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break;
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+ case PROP_MIN_BUFFERS:
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+ g_value_set_uint (value, v4l2object->min_buffers);
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+ break;
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default:
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return FALSE;
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break;
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@@ -822,6 +843,9 @@ gst_v4l2_get_driver_min_buffers (GstV4l2Object * v4l2object)
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{
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struct v4l2_control control = { 0, };
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+ if (v4l2object->min_buffers)
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+ return;
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+
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g_return_if_fail (GST_V4L2_IS_OPEN (v4l2object));
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if (V4L2_TYPE_IS_OUTPUT (v4l2object->type))
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diff --git a/sys/v4l2/gstv4l2object.h b/sys/v4l2/gstv4l2object.h
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index e5ed0acab..cac92f18c 100644
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--- a/sys/v4l2/gstv4l2object.h
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+++ b/sys/v4l2/gstv4l2object.h
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@@ -246,7 +246,8 @@ GType gst_v4l2_object_get_type (void);
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PROP_CAPTURE_IO_MODE, \
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PROP_EXTRA_CONTROLS, \
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PROP_PIXEL_ASPECT_RATIO, \
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- PROP_FORCE_ASPECT_RATIO
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+ PROP_FORCE_ASPECT_RATIO, \
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+ PROP_MIN_BUFFERS
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/* create/destroy */
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GstV4l2Object* gst_v4l2_object_new (GstElement * element,
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--
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2.20.1
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