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basevideoencoder: Proxy the width/height/framerate/PAR constraints of downstream caps to upstream

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This allows to specify constraints on the compressed downstream caps
by muxers or capsfilters, which will then be forwarded to upstream
and allows video converters to fulfill the constraints.

Code based on Mark Nauwelaerts audio encoder base class.
This commit is contained in:
Sebastian Dröge 2011-08-12 12:25:03 +02:00
parent 92c3aaa6e5
commit d576e23aa4
1 changed files with 71 additions and 0 deletions
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71
gst-libs/gst/video/gstbasevideoencoder.c
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@ -117,6 +117,7 @@ static void gst_base_video_encoder_finalize (GObject * object);
static gboolean gst_base_video_encoder_sink_setcaps (GstPad * pad,
GstCaps * caps);
static GstCaps *gst_base_video_encoder_sink_getcaps (GstPad * pad);
static gboolean gst_base_video_encoder_src_event (GstPad * pad,
GstEvent * event);
static gboolean gst_base_video_encoder_sink_event (GstPad * pad,
@ -210,6 +211,8 @@ gst_base_video_encoder_init (GstBaseVideoEncoder * base_video_encoder,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_sink_event));
gst_pad_set_setcaps_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_sink_setcaps));
gst_pad_set_getcaps_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_sink_getcaps));
pad = GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_encoder);
@ -358,6 +361,74 @@ exit:
return ret;
}
static GstCaps *
gst_base_video_encoder_sink_getcaps (GstPad * pad)
{
GstBaseVideoEncoder *base_video_encoder;
const GstCaps *templ_caps;
GstCaps *allowed;
GstCaps *fcaps, *filter_caps;
gint i, j;
base_video_encoder = GST_BASE_VIDEO_ENCODER (gst_pad_get_parent (pad));
/* FIXME: Allow subclass to override this? */
/* Allow downstream to specify width/height/framerate/PAR constraints
* and forward them upstream for video converters to handle
*/
templ_caps =
gst_pad_get_pad_template_caps (GST_BASE_VIDEO_CODEC_SINK_PAD
(base_video_encoder));
allowed =
gst_pad_get_allowed_caps (GST_BASE_VIDEO_CODEC_SRC_PAD
(base_video_encoder));
if (!allowed || gst_caps_is_empty (allowed) || gst_caps_is_any (allowed)) {
fcaps = gst_caps_copy (templ_caps);
goto done;
}
GST_LOG_OBJECT (base_video_encoder, "template caps %" GST_PTR_FORMAT,
templ_caps);
GST_LOG_OBJECT (base_video_encoder, "allowed caps %" GST_PTR_FORMAT, allowed);
filter_caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (templ_caps); i++) {
GQuark q_name =
gst_structure_get_name_id (gst_caps_get_structure (templ_caps, i));
for (j = 0; j < gst_caps_get_size (allowed); j++) {
const GstStructure *allowed_s = gst_caps_get_structure (allowed, j);
const GValue *val;
GstStructure *s;
s = gst_structure_id_empty_new (q_name);
if ((val = gst_structure_get_value (allowed_s, "width")))
gst_structure_set_value (s, "width", val);
if ((val = gst_structure_get_value (allowed_s, "height")))
gst_structure_set_value (s, "height", val);
if ((val = gst_structure_get_value (allowed_s, "framerate")))
gst_structure_set_value (s, "framerate", val);
if ((val = gst_structure_get_value (allowed_s, "pixel-aspect-ratio")))
gst_structure_set_value (s, "pixel-aspect-ratio", val);
gst_caps_merge_structure (filter_caps, s);
}
}
fcaps = gst_caps_intersect (filter_caps, templ_caps);
gst_caps_unref (filter_caps);
done:
gst_caps_replace (&allowed, NULL);
GST_LOG_OBJECT (base_video_encoder, "Returning caps %" GST_PTR_FORMAT, fcaps);
return fcaps;
}
static void
gst_base_video_encoder_finalize (GObject * object)
{