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201 lines
6.1 KiB
C
201 lines
6.1 KiB
C
/* GStreamer
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* Copyright (C) 2010 Stefan Kost <stefan.kost@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* 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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* - 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/gstinterpolationcontrolsource.h>
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#include <gst/controller/gstdirectcontrolbinding.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 (GstObject * elem, GstStructure * prog)
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{
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const GstStructure *s;
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GstControlSource *cs;
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GstClockTime ts, dur;
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gdouble 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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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_object_add_control_binding (elem,
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gst_direct_control_binding_new (elem, name, cs));
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g_object_set (cs, "mode", GST_INTERPOLATION_MODE_NONE, NULL);
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g_hash_table_insert (css, (gpointer) name, cs);
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gst_object_unref (cs);
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}
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gst_structure_get_double (s, name, &v);
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gst_timed_value_control_source_set ((GstTimedValueControlSource *) cs, ts,
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v);
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GST_DEBUG (" %s = %lf", name, v);
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}
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ts += dur;
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}
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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, *cvt, *fmt, *enc, *sink;
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GstCaps *caps;
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GstStructure *prog;
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/* init gstreamer */
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gst_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, width=640, height=480, framerate=(fraction)15/1");
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g_object_set (fmt, "caps", caps, NULL);
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if (!(cvt = gst_element_factory_make ("videoconvert", NULL))) {
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GST_WARNING ("Can't create element \"videoconvert\"");
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return -1;
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}
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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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/* add objects to the main bin */
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gst_bin_add_many (GST_BIN (bin), src, cvt, fmt, enc, sink, NULL);
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/* link elements */
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if (!gst_element_link_many (src, cvt, 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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/* program 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\\=0.0\\;\""
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", image01=(structure)\"image\\,contrast\\=0.3\\;\""
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", image02=(structure)\"image\\,contrast\\=1.0\\;\""
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", image03=(structure)\"image\\,contrast\\=0.05\\;\";", 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\\=1.0\\,contrast\\=0.0\\;\""
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", image01=(structure)\"image\\,brightness\\=0.5\\,contrast\\=0.3\\;\""
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", image02=(structure)\"image\\,brightness\\=0.25\\,contrast\\=1.0\\;\""
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", image03=(structure)\"image\\,brightness\\=0.0\\,contrast\\=0.05\\;\";",
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NULL);
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#endif
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set_program (GST_OBJECT (src), prog);
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g_object_set (src, "num-buffers", gst_structure_n_fields (prog),
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"device", argv[1] ? argv[1] : "/dev/video0", 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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