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subtitleoverlay: Add a subtitle-ts-offset property

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This property controls the synchronisation offset between text and video in
nanoseconds, by updating the parser src pad offset.

https://bugzilla.gnome.org/show_bug.cgi?id=797134
This commit is contained in:
Philippe Normand 2018-10-28 14:35:17 +00:00
parent cc0bcd5856
commit 3cd38be94b
2 changed files with 37 additions and 1 deletions
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37
gst/playback/gstsubtitleoverlay.c
View file

@ -76,7 +76,8 @@ enum
PROP_0,
PROP_SILENT,
PROP_FONT_DESC,
PROP_SUBTITLE_ENCODING
PROP_SUBTITLE_ENCODING,
PROP_SUBTITLE_TS_OFFSET
};
#define gst_subtitle_overlay_parent_class parent_class
@ -719,6 +720,20 @@ gst_subtitle_overlay_set_fps (GstSubtitleOverlay * self)
g_object_set (self->parser, "video-fps", self->fps_n, self->fps_d, NULL);
}
static void
_update_subtitle_offset (GstSubtitleOverlay * self)
{
if (self->parser) {
GstPad *srcpad = gst_element_get_static_pad (self->parser, "src");
GST_DEBUG_OBJECT (self, "setting subtitle offset to %" G_GINT64_FORMAT,
self->subtitle_ts_offset);
gst_pad_set_offset (srcpad, -self->subtitle_ts_offset);
gst_object_unref (srcpad);
} else {
GST_LOG_OBJECT (self, "no parser, subtitle offset can't be updated");
}
}
static const gchar *
_get_silent_property (GstElement * element, gboolean * invert)
{
@ -1303,6 +1318,7 @@ _pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
GST_DEBUG_OBJECT (self, "Everything worked, unblocking pads");
unblock_video (self);
unblock_subtitle (self);
_update_subtitle_offset (self);
do_async_done (self);
out:
@ -1490,6 +1506,12 @@ gst_subtitle_overlay_get_property (GObject * object, guint prop_id,
g_value_set_string (value, self->encoding);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_TS_OFFSET:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_value_set_int64 (value, self->subtitle_ts_offset);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1551,6 +1573,13 @@ gst_subtitle_overlay_set_property (GObject * object, guint prop_id,
g_object_set (self->parser, "subtitle-encoding", self->encoding, NULL);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_TS_OFFSET:
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_ts_offset = g_value_get_int64 (value);
_update_subtitle_offset (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1589,6 +1618,12 @@ gst_subtitle_overlay_class_init (GstSubtitleOverlayClass * klass)
"ISO-8859-15 will be assumed.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBTITLE_TS_OFFSET,
g_param_spec_int64 ("subtitle-ts-offset", "Subtitle Timestamp Offset",
"The synchronisation offset between text and video in nanoseconds",
G_MININT64, G_MAXINT64, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class, &srctemplate);
gst_element_class_add_static_pad_template (element_class,

1
gst/playback/gstsubtitleoverlay.h
View file

@ -63,6 +63,7 @@ struct _GstSubtitleOverlay
gboolean silent;
gchar *font_desc;
gchar *encoding;
gint64 subtitle_ts_offset;
/* < private > */
gboolean do_async;