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playsink: Add text-offset property

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When the playsink contains a text chain this property controls the
synchronisation of the subtitles and video by controlling the underlying
subtitleoverlay::subtitle-ts-offset property.

https://bugzilla.gnome.org/show_bug.cgi?id=797134
This commit is contained in:
Philippe Normand 2018-10-28 14:42:31 +00:00
parent 3cd38be94b
commit ea3b074ead
2 changed files with 67 additions and 0 deletions
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64
gst/playback/gstplaysink.c
View file

@ -255,6 +255,7 @@ struct _GstPlaySink
gboolean volume_changed; /* volume/mute changed while no audiochain */
gboolean mute_changed; /* ... has been created yet */
gint64 av_offset;
gint64 text_offset;
GstPlaySinkSendEventMode send_event_mode;
gboolean force_aspect_ratio;
@ -340,6 +341,7 @@ enum
PROP_VIS_PLUGIN,
PROP_SAMPLE,
PROP_AV_OFFSET,
PROP_TEXT_OFFSET,
PROP_VIDEO_SINK,
PROP_AUDIO_SINK,
PROP_TEXT_SINK,
@ -394,6 +396,7 @@ static void notify_mute_cb (GObject * object, GParamSpec * pspec,
GstPlaySink * playsink);
static void update_av_offset (GstPlaySink * playsink);
static void update_text_offset (GstPlaySink * playsink);
static gboolean gst_play_sink_do_reconfigure (GstPlaySink * playsink);
@ -518,6 +521,19 @@ gst_play_sink_class_init (GstPlaySinkClass * klass)
G_MININT64, G_MAXINT64, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstPlaySink:text-offset:
*
* Control the synchronisation offset between the text and video streams.
* Positive values make the text ahead of the video and negative values make
* the text go behind the video.
*/
g_object_class_install_property (gobject_klass, PROP_TEXT_OFFSET,
g_param_spec_int64 ("text-offset", "Text Offset",
"The synchronisation offset between text and video in nanoseconds",
G_MININT64, G_MAXINT64, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstPlaySink:video-filter:
*
@ -3865,6 +3881,7 @@ gst_play_sink_do_reconfigure (GstPlaySink * playsink)
}
}
update_av_offset (playsink);
update_text_offset (playsink);
do_async_done (playsink);
GST_PLAY_SINK_UNLOCK (playsink);
@ -4036,6 +4053,47 @@ gst_play_sink_get_av_offset (GstPlaySink * playsink)
return result;
}
static void
update_text_offset (GstPlaySink * playsink)
{
gint64 text_offset;
GstPlayTextChain *tchain;
text_offset = playsink->text_offset;
tchain = (GstPlayTextChain *) playsink->textchain;
if (tchain) {
if (tchain->sink) {
g_object_set (tchain->sink, "ts-offset", text_offset, NULL);
} else if (tchain->overlay) {
g_object_set (tchain->overlay, "subtitle-ts-offset", text_offset, NULL);
}
} else {
GST_LOG_OBJECT (playsink, "no text chain");
}
}
void
gst_play_sink_set_text_offset (GstPlaySink * playsink, gint64 text_offset)
{
GST_PLAY_SINK_LOCK (playsink);
playsink->text_offset = text_offset;
update_text_offset (playsink);
GST_PLAY_SINK_UNLOCK (playsink);
}
gint64
gst_play_sink_get_text_offset (GstPlaySink * playsink)
{
gint64 result;
GST_PLAY_SINK_LOCK (playsink);
result = playsink->text_offset;
GST_PLAY_SINK_UNLOCK (playsink);
return result;
}
/**
* gst_play_sink_get_last_sample:
* @playsink: a #GstPlaySink
@ -5089,6 +5147,9 @@ gst_play_sink_set_property (GObject * object, guint prop_id,
case PROP_AV_OFFSET:
gst_play_sink_set_av_offset (playsink, g_value_get_int64 (value));
break;
case PROP_TEXT_OFFSET:
gst_play_sink_set_text_offset (playsink, g_value_get_int64 (value));
break;
case PROP_VIDEO_FILTER:
gst_play_sink_set_filter (playsink, GST_PLAY_SINK_TYPE_VIDEO,
g_value_get_object (value));
@ -5172,6 +5233,9 @@ gst_play_sink_get_property (GObject * object, guint prop_id,
case PROP_AV_OFFSET:
g_value_set_int64 (value, gst_play_sink_get_av_offset (playsink));
break;
case PROP_TEXT_OFFSET:
g_value_set_int64 (value, gst_play_sink_get_text_offset (playsink));
break;
case PROP_VIDEO_FILTER:
g_value_take_object (value, gst_play_sink_get_filter (playsink,
GST_PLAY_SINK_TYPE_VIDEO));

3
gst/playback/gstplaysink.h
View file

@ -98,6 +98,9 @@ gchar * gst_play_sink_get_subtitle_encoding (GstPlaySink *playsink);
void gst_play_sink_set_av_offset (GstPlaySink *playsink, gint64 av_offset);
gint64 gst_play_sink_get_av_offset (GstPlaySink *playsink);
void gst_play_sink_set_text_offset (GstPlaySink *playsink, gint64 text_offset);
gint64 gst_play_sink_get_text_offset (GstPlaySink *playsink);
GstSample * gst_play_sink_get_last_sample (GstPlaySink * playsink);
GstSample * gst_play_sink_convert_sample (GstPlaySink * playsink, GstCaps * caps);