From 9338395bc546aaf5e1bc97b7f4c33a4746f923c5 Mon Sep 17 00:00:00 2001 From: Stefan Kost Date: Fri, 10 Sep 2010 16:59:10 +0300 Subject: [PATCH] example: add v4l2 example, demonstrating the use of gst controller --- tests/examples/v4l2/.gitignore | 1 + tests/examples/v4l2/Makefile.am | 6 +- tests/examples/v4l2/camctrl.c | 195 ++++++++++++++++++++++++++++++++ 3 files changed, 201 insertions(+), 1 deletion(-) create mode 100644 tests/examples/v4l2/camctrl.c diff --git a/tests/examples/v4l2/.gitignore b/tests/examples/v4l2/.gitignore index da0c4eb8d9..4ab594348c 100644 --- a/tests/examples/v4l2/.gitignore +++ b/tests/examples/v4l2/.gitignore @@ -1 +1,2 @@ +camctrl probe diff --git a/tests/examples/v4l2/Makefile.am b/tests/examples/v4l2/Makefile.am index 53d6399ff1..4fdb7e3638 100644 --- a/tests/examples/v4l2/Makefile.am +++ b/tests/examples/v4l2/Makefile.am @@ -1,4 +1,8 @@ -noinst_PROGRAMS = probe +noinst_PROGRAMS = probe camctrl + +camctrl_SOURCES = camctrl.c +camctrl_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CONTROLLER_CFLAGS) $(GST_CFLAGS) +camctrl_LDADD = $(GST_BASE_LIBS) $(GST_CONTROLLER_LIBS) $(GST_LIBS) probe_SOURCES = probe.c probe_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) diff --git a/tests/examples/v4l2/camctrl.c b/tests/examples/v4l2/camctrl.c new file mode 100644 index 0000000000..7ed6b7172e --- /dev/null +++ b/tests/examples/v4l2/camctrl.c @@ -0,0 +1,195 @@ +/* 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 +#include +#include + +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; +}