mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 16:26:39 +00:00
201 lines
6.1 KiB
C
201 lines
6.1 KiB
C
/* GStreamer
|
|
* Copyright (C) 2010 Stefan Kost <stefan.kost@nokia.com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
/* demo for using gstcontroler with camera capture for e.g. bracketing
|
|
*
|
|
* gcc `pkg-config --cflags --libs gstreamer-0.10 gstreamer-controller-0.10` camctrl.c -o camctrl
|
|
*
|
|
* TODO:
|
|
* - handle stream status and switch capture thread to SCHED_RR/FIFO
|
|
* - we want some feedback about how precisely a program can be realized
|
|
* - we might want to adjust the framerate to handle hardware limmits
|
|
* - we e.g. can't change resolution per frame right now
|
|
*/
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/controller/gstinterpolationcontrolsource.h>
|
|
#include <gst/controller/gstdirectcontrolbinding.h>
|
|
|
|
static void
|
|
event_loop (GstElement * bin)
|
|
{
|
|
GstBus *bus;
|
|
GstMessage *message = NULL;
|
|
|
|
bus = gst_element_get_bus (GST_ELEMENT (bin));
|
|
|
|
while (TRUE) {
|
|
message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);
|
|
|
|
switch (message->type) {
|
|
case GST_MESSAGE_EOS:
|
|
gst_message_unref (message);
|
|
return;
|
|
case GST_MESSAGE_WARNING:
|
|
case GST_MESSAGE_ERROR:{
|
|
GError *gerror;
|
|
gchar *debug;
|
|
|
|
gst_message_parse_error (message, &gerror, &debug);
|
|
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
|
|
gst_message_unref (message);
|
|
g_error_free (gerror);
|
|
g_free (debug);
|
|
return;
|
|
}
|
|
default:
|
|
gst_message_unref (message);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_program (GstObject * elem, GstStructure * prog)
|
|
{
|
|
const GstStructure *s;
|
|
GstControlSource *cs;
|
|
GstClockTime ts, dur;
|
|
gdouble v;
|
|
const GValue *frame;
|
|
GHashTable *css;
|
|
gint i, j;
|
|
const gchar *name;
|
|
|
|
css = g_hash_table_new (g_str_hash, g_str_equal);
|
|
|
|
ts = 0;
|
|
dur = gst_util_uint64_scale_int (GST_SECOND, 1, 15);
|
|
|
|
/* loop over each image in prog */
|
|
for (i = 0; i < gst_structure_n_fields (prog); i++) {
|
|
GST_DEBUG ("ctrl on %" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
|
|
|
|
frame =
|
|
gst_structure_get_value (prog, gst_structure_nth_field_name (prog, i));
|
|
s = gst_value_get_structure (frame);
|
|
for (j = 0; j < gst_structure_n_fields (s); j++) {
|
|
name = gst_structure_nth_field_name (s, j);
|
|
cs = g_hash_table_lookup (css, name);
|
|
if (!cs) {
|
|
cs = gst_interpolation_control_source_new ();
|
|
gst_object_add_control_binding (elem,
|
|
gst_direct_control_binding_new (elem, name, cs));
|
|
g_object_set (cs, "mode", GST_INTERPOLATION_MODE_NONE, NULL);
|
|
g_hash_table_insert (css, (gpointer) name, cs);
|
|
gst_object_unref (cs);
|
|
}
|
|
gst_structure_get_double (s, name, &v);
|
|
gst_timed_value_control_source_set ((GstTimedValueControlSource *) cs, ts,
|
|
v);
|
|
GST_DEBUG (" %s = %lf", name, v);
|
|
}
|
|
ts += dur;
|
|
}
|
|
|
|
g_hash_table_unref (css);
|
|
}
|
|
|
|
gint
|
|
main (gint argc, gchar ** argv)
|
|
{
|
|
GstElement *bin;
|
|
GstElement *src, *cvt, *fmt, *enc, *sink;
|
|
GstCaps *caps;
|
|
GstStructure *prog;
|
|
|
|
/* init gstreamer */
|
|
gst_init (&argc, &argv);
|
|
|
|
/* create a new bin to hold the elements */
|
|
bin = gst_pipeline_new ("camera");
|
|
|
|
/* create elements */
|
|
if (!(sink = gst_element_factory_make ("multifilesink", NULL))) {
|
|
GST_WARNING ("Can't create element \"multifilesink\"");
|
|
return -1;
|
|
}
|
|
g_object_set (sink, "location", "image%02d.jpg", NULL);
|
|
|
|
if (!(enc = gst_element_factory_make ("jpegenc", NULL))) {
|
|
GST_WARNING ("Can't create element \"jpegenc\"");
|
|
return -1;
|
|
}
|
|
|
|
if (!(fmt = gst_element_factory_make ("capsfilter", NULL))) {
|
|
GST_WARNING ("Can't create element \"capsfilter\"");
|
|
return -1;
|
|
}
|
|
caps =
|
|
gst_caps_from_string
|
|
("video/x-raw, width=640, height=480, framerate=(fraction)15/1");
|
|
g_object_set (fmt, "caps", caps, NULL);
|
|
|
|
if (!(cvt = gst_element_factory_make ("videoconvert", NULL))) {
|
|
GST_WARNING ("Can't create element \"videoconvert\"");
|
|
return -1;
|
|
}
|
|
|
|
if (!(src = gst_element_factory_make ("v4l2src", NULL))) {
|
|
GST_WARNING ("Can't create element \"v4l2src\"");
|
|
return -1;
|
|
}
|
|
|
|
/* add objects to the main bin */
|
|
gst_bin_add_many (GST_BIN (bin), src, cvt, fmt, enc, sink, NULL);
|
|
|
|
/* link elements */
|
|
if (!gst_element_link_many (src, cvt, fmt, enc, sink, NULL)) {
|
|
GST_WARNING ("Can't link elements");
|
|
return -1;
|
|
}
|
|
|
|
/* programm a pattern of events */
|
|
#if 0
|
|
prog = gst_structure_from_string ("program"
|
|
", image00=(structure)\"image\\,contrast\\=0.0\\;\""
|
|
", image01=(structure)\"image\\,contrast\\=0.3\\;\""
|
|
", image02=(structure)\"image\\,contrast\\=1.0\\;\""
|
|
", image03=(structure)\"image\\,contrast\\=0.05\\;\";", NULL);
|
|
#endif
|
|
#if 1
|
|
prog = gst_structure_from_string ("program"
|
|
", image00=(structure)\"image\\,brightness\\=1.0\\,contrast\\=0.0\\;\""
|
|
", image01=(structure)\"image\\,brightness\\=0.5\\,contrast\\=0.3\\;\""
|
|
", image02=(structure)\"image\\,brightness\\=0.25\\,contrast\\=1.0\\;\""
|
|
", image03=(structure)\"image\\,brightness\\=0.0\\,contrast\\=0.05\\;\";",
|
|
NULL);
|
|
#endif
|
|
set_program (GST_OBJECT (src), prog);
|
|
g_object_set (src, "num-buffers", gst_structure_n_fields (prog),
|
|
"device", argv[1] ? argv[1] : "/dev/video0", NULL);
|
|
|
|
/* prepare playback */
|
|
gst_element_set_state (bin, GST_STATE_PAUSED);
|
|
|
|
/* play and wait */
|
|
gst_element_set_state (bin, GST_STATE_PLAYING);
|
|
|
|
/* mainloop and wait for eos */
|
|
event_loop (bin);
|
|
|
|
/* stop and cleanup */
|
|
gst_element_set_state (bin, GST_STATE_NULL);
|
|
gst_object_unref (GST_OBJECT (bin));
|
|
return 0;
|
|
}
|