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glvideomixer: bas output width/height on the pad properties

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Allows automatic negotiation of the size in the following case:
gst-launch-1.0 glvideomixer name=m sink_0::xpos=0 sink_1::xpos=320 ! glimagesink \
    videotestsrc ! m. \
    videotestsrc pattern=1 ! m.

https://bugzilla.gnome.org/show_bug.cgi?id=731878
This commit is contained in:
Matthew Waters 2014-06-25 12:00:34 +10:00
parent 4c02c4f004
commit c37ace1844
1 changed files with 50 additions and 1 deletions
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51
ext/gl/gstglvideomixer.c
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@ -60,6 +60,7 @@ static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean _update_info (GstVideoAggregator * vagg, GstVideoInfo * info);
static void gst_gl_video_mixer_reset (GstGLMixer * mixer);
static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer,
GstCaps * outcaps);
@ -249,6 +250,7 @@ gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
GObjectClass *gobject_class;
GstElementClass *element_class;
GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
GstVideoAggregatorClass *vagg_class = (GstVideoAggregatorClass *) klass;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
@ -265,8 +267,9 @@ gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
GST_GL_MIXER_CLASS (klass)->process_textures =
gst_gl_video_mixer_process_textures;
agg_class->sinkpads_type = GST_TYPE_GL_VIDEO_MIXER_PAD;
vagg_class->update_info = _update_info;
agg_class->sinkpads_type = GST_TYPE_GL_VIDEO_MIXER_PAD;
}
static void
@ -298,6 +301,52 @@ gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
}
}
static gboolean
_update_info (GstVideoAggregator * vagg, GstVideoInfo * info)
{
GList *l;
gint best_width = -1, best_height = -1;
gboolean ret = FALSE;
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *vaggpad = l->data;
GstGLVideoMixerPad *mixer_pad = GST_GL_VIDEO_MIXER_PAD (vaggpad);
gint this_width, this_height;
gint width, height;
if (mixer_pad->width > 0)
width = mixer_pad->width;
else
width = GST_VIDEO_INFO_WIDTH (&vaggpad->info);
if (mixer_pad->height > 0)
height = mixer_pad->height;
else
height = GST_VIDEO_INFO_HEIGHT (&vaggpad->info);
if (width == 0 || height == 0)
continue;
this_width = width + MAX (mixer_pad->xpos, 0);
this_height = height + MAX (mixer_pad->ypos, 0);
if (best_width < this_width)
best_width = this_width;
if (best_height < this_height)
best_height = this_height;
}
GST_OBJECT_UNLOCK (vagg);
if (best_width > 0 && best_height > 0) {
gst_video_info_set_format (info, GST_VIDEO_INFO_FORMAT (info),
best_width, best_height);
ret = TRUE;
}
return ret;
}
static void
gst_gl_video_mixer_reset (GstGLMixer * mixer)
{