mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-23 10:11:08 +00:00
2498457b2f
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>
114 lines
3.3 KiB
C
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;
|
|
}
|