gstreamer/subprojects/gst-plugins-good/tests/examples/rtsp/test-onvif.c
Christian Wick 2498457b2f rtspsrc: Introduce new action signal push-backchannel-sample with correct ownership semantics
Signals are not supposed to take ownership of their arguments but only
borrow them for the scope of the signal emission.

The old action signal `push-backchannel-buffer` is now marked deprecated.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3363>
2022-11-10 13:04:04 +02:00

114 lines
3.3 KiB
C

#include <gst/gst.h>
static GMainLoop *loop = NULL;
static GstElement *backpipe = NULL;
static gint stream_id = -1;
#define PCMU_CAPS "application/x-rtp, media=audio, payload=0, clock-rate=8000, encoding-name=PCMU"
static GstFlowReturn
new_sample (GstElement * appsink, GstElement * rtspsrc)
{
GstSample *sample;
GstFlowReturn ret = GST_FLOW_OK;
g_assert (stream_id != -1);
/* get the sample from appsink */
g_signal_emit_by_name (appsink, "pull-sample", &sample);
if (!sample)
goto nosample;
g_signal_emit_by_name (rtspsrc, "push-backchannel-sample", stream_id, sample,
&ret);
/* Action signal callbacks don't take ownership of the arguments passed, so we must unref the sample here.
* (The "push-backchannel-buffer" callback unrefs the sample, which is wrong and doesn't work with bindings
* but could not be changed, hence the new "push-backchannel-sample" callback that behaves correctly.) */
gst_sample_unref (sample);
nosample:
return ret;
}
static void
setup_backchannel_shoveler (GstElement * rtspsrc, GstCaps * caps)
{
GstElement *appsink;
backpipe = gst_parse_launch ("audiotestsrc is-live=true wave=red-noise ! "
"mulawenc ! rtppcmupay ! appsink name=out", NULL);
if (!backpipe)
g_error ("Could not setup backchannel pipeline");
appsink = gst_bin_get_by_name (GST_BIN (backpipe), "out");
g_object_set (G_OBJECT (appsink), "caps", caps, "emit-signals", TRUE, NULL);
g_signal_connect (appsink, "new-sample", G_CALLBACK (new_sample), rtspsrc);
g_print ("Playing backchannel shoveler\n");
gst_element_set_state (backpipe, GST_STATE_PLAYING);
}
static gboolean
remove_extra_fields (GQuark field_id, GValue * value G_GNUC_UNUSED,
gpointer user_data G_GNUC_UNUSED)
{
return !g_str_has_prefix (g_quark_to_string (field_id), "a-");
}
static gboolean
find_backchannel (GstElement * rtspsrc, guint idx, GstCaps * caps,
gpointer user_data G_GNUC_UNUSED)
{
GstStructure *s;
gchar *caps_str = gst_caps_to_string (caps);
g_print ("Selecting stream idx %u, caps %s\n", idx, caps_str);
g_free (caps_str);
s = gst_caps_get_structure (caps, 0);
if (gst_structure_has_field (s, "a-sendonly")) {
stream_id = idx;
caps = gst_caps_new_empty ();
s = gst_structure_copy (s);
gst_structure_set_name (s, "application/x-rtp");
gst_structure_filter_and_map_in_place (s, remove_extra_fields, NULL);
gst_caps_append_structure (caps, s);
setup_backchannel_shoveler (rtspsrc, caps);
}
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *pipeline, *rtspsrc;
const gchar *location;
gst_init (&argc, &argv);
if (argc >= 2)
location = argv[1];
else
location = "rtsp://127.0.0.1:8554/test";
loop = g_main_loop_new (NULL, FALSE);
pipeline = gst_parse_launch ("rtspsrc backchannel=onvif debug=true name=r "
"r. ! queue ! decodebin ! queue ! xvimagesink async=false "
"r. ! queue ! decodebin ! queue ! pulsesink async=false ", NULL);
if (!pipeline)
g_error ("Failed to parse pipeline");
rtspsrc = gst_bin_get_by_name (GST_BIN (pipeline), "r");
g_object_set (G_OBJECT (rtspsrc), "location", location, NULL);
g_signal_connect (rtspsrc, "select-stream", G_CALLBACK (find_backchannel),
NULL);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_main_loop_run (loop);
return 0;
}