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/* 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
* - the queue-size controls the controler offset
* - right now we work with 1 queued picture and thus active settings for next
* frame
* - 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/gstcontroller.h>
#include <gst/controller/gstinterpolationcontrolsource.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 (GstController * ctrl, GstStructure * prog)
{
const GstStructure *s;
GstInterpolationControlSource *cs;
GstClockTime ts, dur;
GValue val = { 0, };
gint v;
const GValue *frame;
GHashTable *css;
gint i, j;
const gchar *name;
css = g_hash_table_new (g_str_hash, g_str_equal);
g_value_init (&val, G_TYPE_INT);
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_controller_set_control_source (ctrl, name, GST_CONTROL_SOURCE (cs));
gst_interpolation_control_source_set_interpolation_mode (cs,
GST_INTERPOLATE_NONE);
g_hash_table_insert (css, (gpointer) name, cs);
g_object_unref (cs);
}
gst_structure_get_int (s, name, &v);
g_value_set_int (&val, v);
gst_interpolation_control_source_set (cs, ts, &val);
GST_DEBUG (" %s = %d", name, v);
}
ts += dur;
}
g_value_unset (&val);
g_hash_table_unref (css);
}
gint
main (gint argc, gchar ** argv)
{
GstElement *bin;
GstElement *src, *fmt, *enc, *sink;
GstCaps *caps;
GstController *ctrl;
GstStructure *prog;
/* init gstreamer */
gst_init (&argc, &argv);
gst_controller_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-yuv, width=640, height=480, framerate=(fraction)15/1");
g_object_set (fmt, "caps", caps, NULL);
if (!(src = gst_element_factory_make ("v4l2src", NULL))) {
GST_WARNING ("Can't create element \"v4l2src\"");
return -1;
}
g_object_set (src, "queue-size", 1, NULL);
/* add objects to the main bin */
gst_bin_add_many (GST_BIN (bin), src, fmt, enc, sink, NULL);
/* link elements */
if (!gst_element_link_many (src, fmt, enc, sink, NULL)) {
GST_WARNING ("Can't link elements");
return -1;
}
/* get the controller */
if (!(ctrl = gst_controller_new (G_OBJECT (src), "brightness", "contrast",
"saturation", NULL))) {
GST_WARNING ("can't control source element");
return -1;
}
/* programm a pattern of events */
#if 0
prog = gst_structure_from_string ("program"
", image00=(structure)\"image\\,contrast\\=0\\;\""
", image01=(structure)\"image\\,contrast\\=79\\;\""
", image02=(structure)\"image\\,contrast\\=255\\;\""
", image03=(structure)\"image\\,contrast\\=15\\;\";", NULL);
#endif
#if 1
prog = gst_structure_from_string ("program"
", image00=(structure)\"image\\,brightness\\=255\\,contrast\\=0\\;\""
", image01=(structure)\"image\\,brightness\\=127\\,contrast\\=79\\;\""
", image02=(structure)\"image\\,brightness\\=64\\,contrast\\=255\\;\""
", image03=(structure)\"image\\,brightness\\=0\\,contrast\\=15\\;\";",
NULL);
#endif
set_program (ctrl, prog);
g_object_set (src, "num-buffers", gst_structure_n_fields (prog), 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;
}
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