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decodebin2: Add a property to not expose/decode all streams

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API : expose-all-streams

If disabled:
* only the streams that CAN be decoded and match the final caps will have a
  decoder plugged in and be exposed.
* the streams that COULD HAVE BEEN decoded but do not match the finals caps
  will not have a decoder plugged in and will not be exposed.

If no decoder is available to decode a certain stream, then the missing element
message will still be emitted regardless of the value of the property.

https://bugzilla.gnome.org/show_bug.cgi?id=617868
This commit is contained in:
Edward Hervey 2010-05-06 18:50:51 +02:00
parent e84b203de2
commit ac4188bd54
1 changed files with 94 additions and 1 deletions
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95
gst/playback/gstdecodebin2.c
View file

@ -167,6 +167,8 @@ struct _GstDecodeBin
GMutex *dyn_lock; /* lock protecting pad blocking */
gboolean shutdown; /* if we are shutting down */
GList *blocked_pads; /* pads that have set to block */
gboolean expose_allstreams; /* Whether to expose unknow type streams or not */
};
struct _GstDecodeBinClass
@ -232,6 +234,7 @@ enum
#define DEFAULT_MAX_SIZE_BUFFERS 0
#define DEFAULT_MAX_SIZE_TIME 0
#define DEFAULT_POST_STREAM_TOPOLOGY FALSE
#define DEFAULT_EXPOSE_ALL_STREAMS TRUE
/* Properties */
enum
@ -247,6 +250,7 @@ enum
PROP_MAX_SIZE_BUFFERS,
PROP_MAX_SIZE_TIME,
PROP_POST_STREAM_TOPOLOGY,
PROP_EXPOSE_ALL_STREAMS,
PROP_LAST
};
@ -831,6 +835,24 @@ gst_decode_bin_class_init (GstDecodeBinClass * klass)
DEFAULT_POST_STREAM_TOPOLOGY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin2::expose-all-streams
*
* Expose streams of unknown type.
*
* If set to %FALSE, then only the streams that can be decoded to the final
* caps (see 'caps' property) will have a pad exposed. Streams that do not
* match those caps but could have been decoded will not have decoder plugged
* in internally and will not have a pad exposed.
*
* Since: 0.10.30
*/
g_object_class_install_property (gobject_klass, PROP_EXPOSE_ALL_STREAMS,
g_param_spec_boolean ("expose-all-streams", "Expose All Streams",
"Expose all streams, including those of unknown type or that don't match the 'caps' property",
DEFAULT_EXPOSE_ALL_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
klass->autoplug_continue =
@ -926,6 +948,8 @@ gst_decode_bin_init (GstDecodeBin * decode_bin)
decode_bin->max_size_bytes = DEFAULT_MAX_SIZE_BYTES;
decode_bin->max_size_buffers = DEFAULT_MAX_SIZE_BUFFERS;
decode_bin->max_size_time = DEFAULT_MAX_SIZE_TIME;
decode_bin->expose_allstreams = DEFAULT_EXPOSE_ALL_STREAMS;
}
static void
@ -1118,6 +1142,9 @@ gst_decode_bin_set_property (GObject * object, guint prop_id,
case PROP_POST_STREAM_TOPOLOGY:
dbin->post_stream_topology = g_value_get_boolean (value);
break;
case PROP_EXPOSE_ALL_STREAMS:
dbin->expose_allstreams = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1162,6 +1189,9 @@ gst_decode_bin_get_property (GObject * object, guint prop_id,
case PROP_POST_STREAM_TOPOLOGY:
g_value_set_boolean (value, dbin->post_stream_topology);
break;
case PROP_EXPOSE_ALL_STREAMS:
g_value_set_boolean (value, dbin->expose_allstreams);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1348,7 +1378,52 @@ analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
g_value_array_free (factories);
factories = result;
/* 1.e else continue autoplugging something from the list. */
/* At this point we have a potential decoder, but we might not need it
* if it doesn't match the output caps */
if (!dbin->expose_allstreams) {
guint i;
GstCaps *rawcaps = gst_static_caps_get (&default_raw_caps);
const GList *tmps;
gboolean dontuse = FALSE;
GST_DEBUG ("Checking if we can abort early");
/* 1.e Do an early check to see if the candidates are potential decoders, but
* due to the fact that they decode to a mediatype that is not final we don't
* need them */
for (i = 0; i < factories->n_values && !dontuse; i++) {
GstElementFactory *factory =
g_value_get_object (g_value_array_get_nth (factories, 0));
GstCaps *tcaps;
/* We are only interested in skipping decoders */
if (strstr (gst_element_factory_get_klass (factory), "Decoder")) {
GST_DEBUG ("Trying factory %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
/* Check the source pad template caps to see if they match raw caps but don't match
* our final caps*/
for (tmps = gst_element_factory_get_static_pad_templates (factory);
tmps && !dontuse; tmps = tmps->next) {
GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
if (st->direction != GST_PAD_SRC)
continue;
tcaps = gst_static_pad_template_get_caps (st);
if (!gst_caps_can_intersect (tcaps, dbin->caps))
dontuse = TRUE;
gst_caps_unref (tcaps);
}
}
}
gst_caps_unref (rawcaps);
if (dontuse)
goto discarded_type;
}
/* 1.f else continue autoplugging something from the list. */
GST_LOG_OBJECT (pad, "Let's continue discovery on this pad");
connect_pad (dbin, src, dpad, pad, caps, factories, chain);
@ -1364,6 +1439,24 @@ expose_pad:
gst_object_unref (dpad);
return;
}
discarded_type:
{
GST_LOG_OBJECT (pad, "Known type, but discarded because not final caps");
chain->deadend = TRUE;
chain->endcaps = gst_caps_ref (caps);
/* Try to expose anything */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
gst_decode_bin_expose (dbin);
}
EXPOSE_UNLOCK (dbin);
do_async_done (dbin);
return;
}
unknown_type:
{
GST_LOG_OBJECT (pad, "Unknown type, posting message and firing signal");