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#include <gst/gst.h>
#include <gst/interfaces/tuner.h>
#include <gst/interfaces/colorbalance.h>
GstElement *pipeline, *source, *sink;
GMainLoop *loop;
volatile int exit_read = 0;
void
print_options ()
{
printf
("\nLaunch \"./v4l2src-test.c devname\" to choose the device (default: /dev/video0)\n");
printf ("\nf - to change the fequency\n");
printf ("i - to change the input\n");
printf ("c - list color balance\n");
printf ("e - to exit\n");
}
void
run_options (char opt)
{
switch (opt) {
case 'f':
{
GstTuner *tuner = GST_TUNER (source);
GstTunerChannel *channel = gst_tuner_get_channel (tuner);
guint freq;
printf ("type the new frequency (current = %lu) (-1 to cancel): ",
gst_tuner_get_frequency (tuner, channel));
scanf ("%u", &freq);
if (freq != -1)
gst_tuner_set_frequency (tuner, channel, freq);
}
break;
case 'i':
{
GstTuner *tuner = GST_TUNER (source);
const GList *item, *list;
const GstTunerChannel *current_channel;
GstTunerChannel *channel = NULL;
gint index, next_channel;
list = gst_tuner_list_channels (tuner);
current_channel = gst_tuner_get_channel (tuner);
printf ("\nlist of inputs:\n");
for (item = list, index = 0; item != NULL; item = item->next, ++index) {
channel = item->data;
if (current_channel == channel) {
printf (" * %u - %s\n", index, channel->label);
} else {
printf (" %u - %s\n", index, channel->label);
}
}
printf ("\ntype the number of input you want (-1 to cancel): ");
scanf ("%d", &next_channel);
if (next_channel < 0 || index <= next_channel) {
break;
}
for (item = list, index = 0; item != NULL && index <= next_channel;
item = item->next, ++index) {
channel = item->data;
}
if (channel)
gst_tuner_set_channel (tuner, channel);
}
break;
case 'e':
gst_element_set_state (pipeline, GST_STATE_NULL);
g_main_loop_quit (loop);
printf ("Bye\n");
g_thread_exit (0);
break;
case 'c':
{
GstColorBalance *balance = GST_COLOR_BALANCE (source);
const GList *controls = gst_color_balance_list_channels (balance);
GstColorBalanceChannel *channel;
const GList *item;
gint index, new_value;
if (controls) {
printf ("\nlist of controls:\n");
for (item = controls, index = 0; item != NULL;
item = item->next, ++index) {
channel = item->data;
printf (" %u - %s (%d - %d) = %d\n", index, channel->label,
channel->min_value, channel->max_value,
gst_color_balance_get_value (balance, channel));
}
printf ("\ntype the number of color control you want (-1 to cancel): ");
scanf ("%d", &new_value);
if (new_value == -1)
break;
for (item = controls, index = 0; item != NULL && index <= new_value;
item = item->next, ++index) {
channel = item->data;
}
printf (" %u - %s (%d - %d) = %d, type the new value: ", index,
channel->label, channel->min_value, channel->max_value,
gst_color_balance_get_value (balance, channel));
scanf ("%d", &new_value);
if (new_value == -1)
break;
gst_color_balance_set_value (balance, channel, new_value);
}
}
break;
default:
if (opt != 10)
printf ("error: invalid option %c", opt);
break;
}
}
gpointer
read_user (gpointer data)
{
char opt;
while (!exit_read) {
print_options ();
opt = getchar ();
if (exit_read) {
break;
}
run_options (opt);
}
return NULL;
}
static gboolean
my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
{
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err;
gchar *debug;
gst_message_parse_error (message, &err, &debug);
g_print ("Error: %s - element %s\n", err->message,
gst_element_get_name (message->src));
g_error_free (err);
g_free (debug);
printf ("presse any key to exit\n");
exit_read = 1;
g_main_loop_quit (loop);
break;
case GST_MESSAGE_EOS:
/* end-of-stream */
printf ("presse any key to exit\n");
exit_read = 1;
g_main_loop_quit (loop);
break;
default:
break;
}
}
return TRUE;
}
int
main (int argc, char *argv[])
{
GThread *input_thread;
/* init */
gst_init (&argc, &argv);
/* create elements */
if (!(pipeline = gst_pipeline_new ("my_pipeline"))) {
fprintf (stderr, "error: gst_pipeline_new return NULL");
return -1;
}
if (!(source = gst_element_factory_make ("v4l2src", NULL))) {
fprintf (stderr,
"error: gst_element_factory_make (\"v4l2src\", NULL) return NULL");
return -1;
}
if (!(sink = gst_element_factory_make ("xvimagesink", NULL))) {
fprintf (stderr,
"error: gst_element_factory_make (\"xvimagesink\", NULL) return NULL");
return -1;
}
if (argc < 2) {
g_object_set (source, "device", "/dev/video0", NULL);
} else {
g_object_set (source, "device", argv[1], NULL);
}
/* you would normally check that the elements were created properly */
gst_bus_add_watch (gst_pipeline_get_bus (GST_PIPELINE (pipeline)),
my_bus_callback, NULL);
/* put together a pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL);
gst_element_link_pads (source, "src", sink, "sink");
/* start the pipeline */
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
loop = g_main_loop_new (NULL, FALSE);
if (!(input_thread = g_thread_create (read_user, source, TRUE, NULL))) {
fprintf (stderr, "error: g_thread_create return NULL");
return -1;
}
if (argc < 2)
printf
("\nOpening /dev/video0. Launch ./v4l2src-test.c devname to try another one\n");
g_main_loop_run (loop);
g_thread_join (input_thread);
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
gst_object_unref (pipeline);
gst_deinit ();
return 0;
}
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