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rtspsrc: Add a signal to allow outgoing messages to be modified or dropped

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This feature allows applications to implement extensions to the RTSP
protocol, such as those defined in the ONVIF Streaming Specification.

https://bugzilla.gnome.org/show_bug.cgi?id=762884
This commit is contained in:
Matt Staples 2017-11-01 08:21:37 -06:00 committed by Sebastian Dröge
parent 3c0d006c03
commit ea1b10e4ca
1 changed files with 52 additions and 0 deletions
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52
gst/rtsp/gstrtspsrc.c
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@ -125,6 +125,7 @@ enum
SIGNAL_NEW_MANAGER,
SIGNAL_REQUEST_RTCP_KEY,
SIGNAL_ACCEPT_CERTIFICATE,
SIGNAL_BEFORE_SEND,
LAST_SIGNAL
};
@ -437,6 +438,26 @@ select_stream_accum (GSignalInvocationHint * ihint,
return myboolean;
}
static gboolean
default_before_send (GstRTSPSrc * src, GstRTSPMessage * msg)
{
GST_DEBUG_OBJECT (src, "default handler");
return TRUE;
}
static gboolean
before_send_accum (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer data)
{
gboolean myboolean;
myboolean = g_value_get_boolean (handler_return);
g_value_set_boolean (return_accu, myboolean);
/* prevent send if FALSE */
return myboolean;
}
static void
gst_rtspsrc_class_init (GstRTSPSrcClass * klass)
{
@ -921,6 +942,29 @@ gst_rtspsrc_class_init (GstRTSPSrcClass * klass)
G_TYPE_BOOLEAN, 3, G_TYPE_TLS_CONNECTION, G_TYPE_TLS_CERTIFICATE,
G_TYPE_TLS_CERTIFICATE_FLAGS);
/*
* GstRTSPSrc::before-send
* @rtspsrc: a #GstRTSPSrc
* @num: the stream number
*
* Emitted before each RTSP request is sent, in order to allow
* the application to modify send parameters or to skip the message entirely.
* This can be used, for example, to work with ONVIF Profile G servers,
* which need a different/additional range, rate-control, and intra/x
* parameters.
*
* Returns: %TRUE when the command should be sent, %FALSE when the
* command should be dropped.
*
* Since: 1.14
*/
gst_rtspsrc_signals[SIGNAL_BEFORE_SEND] =
g_signal_new_class_handler ("before-send", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_RUN_CLEANUP,
(GCallback) default_before_send, before_send_accum, NULL,
g_cclosure_marshal_generic, G_TYPE_BOOLEAN,
1, GST_TYPE_RTSP_MESSAGE | G_SIGNAL_TYPE_STATIC_SCOPE);
gstelement_class->send_event = gst_rtspsrc_send_event;
gstelement_class->provide_clock = gst_rtspsrc_provide_clock;
gstelement_class->change_state = gst_rtspsrc_change_state;
@ -5697,11 +5741,19 @@ gst_rtspsrc_try_send (GstRTSPSrc * src, GstRTSPConnInfo * conninfo,
{
GstRTSPResult res;
gint try = 0;
gboolean allow_send = TRUE;
again:
if (!src->short_header)
gst_rtsp_ext_list_before_send (src->extensions, request);
g_signal_emit (src, gst_rtspsrc_signals[SIGNAL_BEFORE_SEND], 0,
request, &allow_send);
if (!allow_send) {
GST_DEBUG_OBJECT (src, "skipping message, disabled by signal");
return GST_RTSP_OK;
}
GST_DEBUG_OBJECT (src, "sending message");
DEBUG_RTSP (src, request);