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From 9ea00bf5e7043cab7da93abcb345b2f5c65285de Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 8 Jun 2012 13:39:37 +0200
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Subject: [PATCH 4/4] camerabin: Set src_filter and zoom_src_filter caps while
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creating the pipeline
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We (Fedora) have been receiving bug reports for cheese, about cheese
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taking 30-60 seconds before showing video, and pausing the same amount of
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time when changing the resolution for example.
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I've managed to reproduce this with a Logitech Webcam Pro 9000, which
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supports a large list of resolutions at about 5 different framerates /
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resolution, in my case with an unmodified gst-plugins-bad-0.10.23, the
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camerabin_create_src_elements function takes approx 7 seconds.
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Running under gdb and interrupting the execution during these 7 seconds
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consistenly points to gst_caps_intersect_full.
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Part of the problem is cheese setting the
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GST_CAMERABIN_FLAG_SOURCE_COLOR_CONVERSION flag, which means that after
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the first ffmpegcsp element in the pipe the total number of caps is
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x resolutions * y framerates * z formats, where both x (due to the camera)
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and z (due to ffmpegcsp) being large. intersecting this with the capabilities
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of other parts of the pipeline simply leads to an explosion of combinations
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which pegs my core i5 CPU @3.1GHz for 7 seconds!
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This patch fixes this issue by setting up the capsfilter elements in the pipe
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with an initial filter, greatly reducing the number of combinations when doing
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cap intersecting.
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This reduces the time spend in camerabin_create_src_elements from approx 7
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to 0.2 seconds. And when patching cheese to use the default camerabin flags,
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(so removing the first ffmpegcsp element) from approx 0.7 to 0.04 seconds
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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gst/camerabin/gstcamerabin.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/gst/camerabin/gstcamerabin.c b/gst/camerabin/gstcamerabin.c
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index a36d5b5..6d7d30f 100644
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--- a/gst/camerabin/gstcamerabin.c
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+++ b/gst/camerabin/gstcamerabin.c
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@@ -606,6 +606,7 @@ camerabin_create_src_elements (GstCameraBin * camera)
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gboolean ret = FALSE;
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GstBin *cbin = GST_BIN (camera);
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gchar *driver_name = NULL;
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+ GstCaps *filter_caps;
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/* Add application set or default video src element */
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if (!(camera->src_vid_src = gst_camerabin_setup_default_element (cbin,
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@@ -625,6 +626,10 @@ camerabin_create_src_elements (GstCameraBin * camera)
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gst_camerabin_create_and_add_element (cbin, "capsfilter",
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"src-capsfilter")))
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goto done;
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+
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+ filter_caps = camerabin_create_view_finder_caps (camera);
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+ g_object_set (G_OBJECT (camera->src_filter), "caps", filter_caps, NULL);
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+
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if (camera->flags & GST_CAMERABIN_FLAG_SOURCE_RESIZE) {
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if (!(camera->src_zoom_crop =
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gst_camerabin_create_and_add_element (cbin, "videocrop",
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@@ -638,6 +643,8 @@ camerabin_create_src_elements (GstCameraBin * camera)
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gst_camerabin_create_and_add_element (cbin, "capsfilter",
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"src-resize-capsfilter")))
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goto done;
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+ g_object_set (G_OBJECT (camera->src_zoom_filter), "caps", filter_caps,
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+ NULL);
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}
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if (camera->app_video_filter) {
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if (!gst_camerabin_add_element (cbin, camera->app_video_filter)) {
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--
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1.7.10.2
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