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encodebasebin: Fix parser selection

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If an encoder supports multiple codecs (a bin wrapping/auto-plugging encoders)
then its src pad template caps might list the supported codecs. Without this
patch the selected parser would be the one corresponding to the first codec,
leading to caps negotiation error later on. The proposed fix is to check the
media type on the parser candidates sink pad templates according to the
requested encoded format.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7670>
This commit is contained in:
Philippe Normand 2024-10-15 15:58:53 +01:00 committed by GStreamer Marge Bot
parent 080b94b5e6
commit cec3c15fc5
1 changed files with 42 additions and 10 deletions
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52
subprojects/gst-plugins-base/gst/encoding/gstencodebasebin.c
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@ -831,8 +831,18 @@ _create_compatible_processor (GList * all_processors,
{
GList *processors1, *processors, *tmp;
GstElement *processor = NULL;
GstElementFactory *factory = NULL;
GstCaps *format = NULL;
GstCaps *encoding_format = NULL;
GstStructure *s;
const gchar *encoding_media_type;
encoding_format = gst_encoding_profile_get_format (sprof);
if (G_UNLIKELY (gst_caps_is_empty (encoding_format))) {
return NULL;
}
s = gst_caps_get_structure (encoding_format, 0);
encoding_media_type = gst_structure_get_name (s);
if (encoder) {
GstPadTemplate *template = gst_element_get_pad_template (encoder, "src");
@ -843,7 +853,7 @@ _create_compatible_processor (GList * all_processors,
if (!format || gst_caps_is_any (format)) {
gst_clear_caps (&format);
format = gst_encoding_profile_get_format (sprof);
format = gst_caps_ref (encoding_format);
}
GST_DEBUG ("Getting list of processors for format %" GST_PTR_FORMAT, format);
@ -864,20 +874,42 @@ _create_compatible_processor (GList * all_processors,
}
for (tmp = processors; tmp; tmp = tmp->next) {
/* FIXME : We're only picking the first one so far */
/* FIXME : signal the user if he wants this */
factory = (GstElementFactory *) tmp->data;
break;
GstElementFactory *candidate_factory = GST_ELEMENT_FACTORY_CAST (tmp->data);
GstPadTemplate *tmpl;
GstCaps *processor_caps;
gboolean is_compatible = FALSE;
processor = gst_element_factory_create (candidate_factory, NULL);
tmpl = gst_element_get_pad_template (processor, "sink");
processor_caps = gst_pad_template_get_caps (tmpl);
if (gst_caps_is_any (processor_caps)) {
is_compatible = TRUE;
} else if (!gst_caps_is_empty (processor_caps)) {
GstStructure *structure = gst_caps_get_structure (processor_caps, 0);
if (!strcmp (encoding_media_type, gst_structure_get_name (structure))) {
is_compatible = TRUE;
}
}
if (factory)
processor = gst_element_factory_create (factory, NULL);
gst_clear_caps (&processor_caps);
if (!is_compatible) {
GST_DEBUG ("Processor %" GST_PTR_FORMAT " is not compatible with format %"
GST_PTR_FORMAT, processor, encoding_format);
gst_clear_object (&processor);
continue;
}
/* FIXME : signal the user if he wants this parser */
break;
}
gst_plugin_feature_list_free (processors);
beach:
if (format)
gst_caps_unref (format);
gst_clear_caps (&format);
gst_clear_caps (&encoding_format);
return processor;
}