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-rw-r--r--tests/examples/v4l2/camctrl.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/tests/examples/v4l2/camctrl.c b/tests/examples/v4l2/camctrl.c
new file mode 100644
index 0000000..3c7262a
--- /dev/null
+++ b/tests/examples/v4l2/camctrl.c
@@ -0,0 +1,213 @@
+/* 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, 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
+ * - 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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