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subtitleoverlay: gracefully handle non raw video streams

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Implement handling of non raw video streams by avoiding colorspace
elements and autoplugging a compatible renderer if available. Fallback
to passthrough if no compatible renderer is found.
This commit is contained in:
Josep Torra 2011-09-12 15:46:46 +02:00
parent 14a79628a7
commit 596c75b541
1 changed files with 155 additions and 52 deletions
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105
gst/playback/gstsubtitleoverlay.c
View file

@ -178,6 +178,42 @@ static const gchar *_sub_pad_names[] = { "subpicture", "subpicture_sink",
"subtitle_sink", "subtitle"
};
static inline gboolean
_is_raw_video (GstStructure * s)
{
const gchar *name;
name = gst_structure_get_name (s);
if (g_str_has_prefix (name, "video/x-raw-"))
return TRUE;
return FALSE;
}
static gboolean
_is_raw_video_pad (GstPad * pad)
{
GstPad *peer = gst_pad_get_peer (pad);
GstCaps *caps;
gboolean raw = TRUE;
if (peer) {
caps = gst_pad_get_negotiated_caps (peer);
if (!caps) {
caps = gst_pad_get_caps_reffed (peer);
}
gst_object_unref (peer);
} else {
caps = gst_pad_get_caps_reffed (pad);
}
raw = _is_raw_video (gst_caps_get_structure (caps, 0));
gst_caps_unref (caps);
return raw;
}
static GstCaps *
_get_sub_caps (GstElementFactory * factory)
{
@ -1067,6 +1103,7 @@ _pad_blocked_cb (GstPad * pad, gboolean blocked, gpointer user_data)
} else {
const gchar *name =
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
gboolean is_raw_video = _is_raw_video_pad (self->video_sinkpad);
if (strcmp (name, "textoverlay") == 0) {
/* Set some textoverlay specific properties */
@ -1086,12 +1123,26 @@ _pad_blocked_cb (GstPad * pad, gboolean blocked, gpointer user_data)
g_object_set (self->renderer, "font-desc", self->font_desc, NULL);
}
if (is_raw_video) {
/* First check that renderer also supports raw video */
sink = _get_video_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
continue;
}
if (G_UNLIKELY (!_is_raw_video_pad (sink))) {
GST_DEBUG_OBJECT (self, "Renderer doesn't support raw video");
gst_object_unref (sink);
continue;
}
gst_object_unref (sink);
/* First link everything internally */
if (G_UNLIKELY (!_create_element (self, &self->post_colorspace,
COLORSPACE, NULL, "post-colorspace", FALSE))) {
continue;
}
src = gst_element_get_static_pad (element, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
@ -1147,6 +1198,49 @@ _pad_blocked_cb (GstPad * pad, gboolean blocked, gpointer user_data)
GST_WARNING_OBJECT (self, "Can't get src pad from " COLORSPACE);
continue;
}
} else { /* No raw video pad */
GstCaps *allowed_caps, *video_caps = NULL;
GstPad *video_peer;
gboolean can_intersect = FALSE;
video_peer = gst_pad_get_peer (self->video_sinkpad);
if (video_peer) {
video_caps = gst_pad_get_negotiated_caps (video_peer);
if (!video_caps) {
video_caps = gst_pad_get_caps_reffed (video_peer);
}
gst_object_unref (video_peer);
}
sink = _get_video_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
continue;
}
allowed_caps = gst_pad_get_caps_reffed (sink);
gst_object_unref (sink);
if (allowed_caps && video_caps)
can_intersect = gst_caps_can_intersect (allowed_caps, video_caps);
if (allowed_caps)
gst_caps_unref (allowed_caps);
if (video_caps)
gst_caps_unref (video_caps);
if (G_UNLIKELY (!can_intersect)) {
GST_WARNING_OBJECT (self, "Renderer with custom caps is not "
"compatible with video stream");
continue;
}
src = gst_element_get_static_pad (element, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
continue;
}
}
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->srcpad), src))) {
@ -1203,11 +1297,20 @@ _pad_blocked_cb (GstPad * pad, gboolean blocked, gpointer user_data)
}
/* Set the sink ghostpad targets */
if (self->pre_colorspace) {
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from " COLORSPACE);
continue;
}
} else {
sink = _get_video_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from %" GST_PTR_FORMAT,
element);
continue;
}
}
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->video_sinkpad), sink))) {