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195 lines
5.6 KiB
C
195 lines
5.6 KiB
C
/* demo for using gstcontroler with camera capture for e.g. bracketing
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*
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* gcc `pkg-config --cflags --libs gstreamer-0.10 gstreamer-controller-0.10` camctrl.c -o camctrl
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*
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* TODO:
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* - handle stream status and switch capture thread to SCHED_RR/FIFO
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* - the queue-size controls the controler offset
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* - right now we work with 1 queued picture and thus active settings for next
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* frame
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* - we want some feedback about how precisely a program can be realized
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* - we might want to adjust the framerate to handle hardware limmits
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* - we e.g. can't change resolution per frame right now
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*/
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#include <gst/gst.h>
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#include <gst/controller/gstcontroller.h>
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#include <gst/controller/gstinterpolationcontrolsource.h>
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static void
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event_loop (GstElement * bin)
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{
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GstBus *bus;
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GstMessage *message = NULL;
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bus = gst_element_get_bus (GST_ELEMENT (bin));
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while (TRUE) {
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message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);
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switch (message->type) {
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case GST_MESSAGE_EOS:
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gst_message_unref (message);
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return;
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case GST_MESSAGE_WARNING:
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case GST_MESSAGE_ERROR:{
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GError *gerror;
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gchar *debug;
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gst_message_parse_error (message, &gerror, &debug);
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gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
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gst_message_unref (message);
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g_error_free (gerror);
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g_free (debug);
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return;
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}
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default:
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gst_message_unref (message);
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break;
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}
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}
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}
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static void
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set_program (GstController * ctrl, GstStructure * prog)
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{
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const GstStructure *s;
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GstInterpolationControlSource *cs;
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GstClockTime ts, dur;
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GValue val = { 0, };
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gint v;
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const GValue *frame;
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GHashTable *css;
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gint i, j;
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const gchar *name;
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css = g_hash_table_new (g_str_hash, g_str_equal);
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g_value_init (&val, G_TYPE_INT);
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ts = 0;
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dur = gst_util_uint64_scale_int (GST_SECOND, 1, 15);
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/* loop over each image in prog */
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for (i = 0; i < gst_structure_n_fields (prog); i++) {
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GST_DEBUG ("ctrl on %" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
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frame =
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gst_structure_get_value (prog, gst_structure_nth_field_name (prog, i));
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s = gst_value_get_structure (frame);
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for (j = 0; j < gst_structure_n_fields (s); j++) {
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name = gst_structure_nth_field_name (s, j);
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cs = g_hash_table_lookup (css, name);
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if (!cs) {
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cs = gst_interpolation_control_source_new ();
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gst_controller_set_control_source (ctrl, name, GST_CONTROL_SOURCE (cs));
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gst_interpolation_control_source_set_interpolation_mode (cs,
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GST_INTERPOLATE_NONE);
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g_hash_table_insert (css, (gpointer) name, cs);
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g_object_unref (cs);
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}
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gst_structure_get_int (s, name, &v);
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g_value_set_int (&val, v);
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gst_interpolation_control_source_set (cs, ts, &val);
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GST_DEBUG (" %s = %d", name, v);
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}
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ts += dur;
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}
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g_value_unset (&val);
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g_hash_table_unref (css);
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}
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gint
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main (gint argc, gchar ** argv)
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{
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GstElement *bin;
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GstElement *src, *fmt, *enc, *sink;
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GstCaps *caps;
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GstController *ctrl;
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GstStructure *prog;
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/* init gstreamer */
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gst_init (&argc, &argv);
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gst_controller_init (&argc, &argv);
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/* create a new bin to hold the elements */
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bin = gst_pipeline_new ("camera");
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/* create elements */
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if (!(sink = gst_element_factory_make ("multifilesink", NULL))) {
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GST_WARNING ("Can't create element \"multifilesink\"");
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return -1;
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}
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g_object_set (sink, "location", "image%02d.jpg", NULL);
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if (!(enc = gst_element_factory_make ("jpegenc", NULL))) {
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GST_WARNING ("Can't create element \"jpegenc\"");
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return -1;
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}
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if (!(fmt = gst_element_factory_make ("capsfilter", NULL))) {
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GST_WARNING ("Can't create element \"capsfilter\"");
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return -1;
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}
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caps =
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gst_caps_from_string
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("video/x-raw-yuv, width=640, height=480, framerate=(fraction)15/1");
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g_object_set (fmt, "caps", caps, NULL);
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if (!(src = gst_element_factory_make ("v4l2src", NULL))) {
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GST_WARNING ("Can't create element \"v4l2src\"");
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return -1;
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}
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g_object_set (src, "queue-size", 1, NULL);
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/* add objects to the main bin */
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gst_bin_add_many (GST_BIN (bin), src, fmt, enc, sink, NULL);
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/* link elements */
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if (!gst_element_link_many (src, fmt, enc, sink, NULL)) {
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GST_WARNING ("Can't link elements");
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return -1;
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}
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/* get the controller */
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if (!(ctrl = gst_controller_new (G_OBJECT (src), "brightness", "contrast",
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"saturation", NULL))) {
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GST_WARNING ("can't control source element");
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return -1;
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}
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/* programm a pattern of events */
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#if 0
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prog = gst_structure_from_string ("program"
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", image00=(structure)\"image\\,contrast\\=0\\;\""
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", image01=(structure)\"image\\,contrast\\=79\\;\""
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", image02=(structure)\"image\\,contrast\\=255\\;\""
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", image03=(structure)\"image\\,contrast\\=15\\;\";", NULL);
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#endif
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#if 1
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prog = gst_structure_from_string ("program"
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", image00=(structure)\"image\\,brightness\\=255\\,contrast\\=0\\;\""
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", image01=(structure)\"image\\,brightness\\=127\\,contrast\\=79\\;\""
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", image02=(structure)\"image\\,brightness\\=64\\,contrast\\=255\\;\""
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", image03=(structure)\"image\\,brightness\\=0\\,contrast\\=15\\;\";",
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NULL);
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#endif
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set_program (ctrl, prog);
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g_object_set (src, "num-buffers", gst_structure_n_fields (prog), NULL);
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/* prepare playback */
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gst_element_set_state (bin, GST_STATE_PAUSED);
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/* play and wait */
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gst_element_set_state (bin, GST_STATE_PLAYING);
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/* mainloop and wait for eos */
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event_loop (bin);
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/* stop and cleanup */
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gst_element_set_state (bin, GST_STATE_NULL);
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gst_object_unref (GST_OBJECT (bin));
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return 0;
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}
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