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sdp: Parse the RFC5576 Source-specific media SDP attributes into caps

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The format of the caps fields is
    ssrc-(SSRC_VALUE)-(ATTRIBUTE_NAME)=(ATTRIBUTE_VALUE)
.

Parsing of the attributes from the caps into the SDP is not implemented
as this depends not only a single stream's caps but on the whole rtpbin
configuration.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2132>
This commit is contained in:
Sebastian Dröge 2022-04-07 19:36:25 +03:00 committed by GStreamer Marge Bot
parent a91b1c64a1
commit 06f90deb5f
1 changed files with 75 additions and 1 deletions
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76
subprojects/gst-plugins-base/gst-libs/gst/sdp/gstsdpmessage.c
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@ -3583,7 +3583,7 @@ gst_sdp_media_caps_adjust_h264 (GstCaps * caps)
*
* a=fmtp:(payload) (param)[=(value)];...
*
* Note that the extmap attribute is set only by gst_sdp_media_attributes_to_caps().
* Note that the extmap, ssrc and rid attributes are set only by gst_sdp_media_attributes_to_caps().
*
* Returns: a #GstCaps, or %NULL if an error happened
*
@ -4216,6 +4216,8 @@ sdp_add_attributes_to_caps (GArray * attributes, GstCaps * caps)
continue;
if (!strcmp (key, "extmap"))
continue;
if (!strcmp (key, "ssrc"))
continue;
if (!strcmp (key, "rid"))
continue;
@ -4343,6 +4345,73 @@ gst_sdp_media_add_extmap_attributes (GArray * attributes, GstCaps * caps)
return GST_SDP_OK;
}
/* parses Source-specific media SDP attributes (RFC5576) into caps */
static GstSDPResult
gst_sdp_media_add_ssrc_attributes (GArray * attributes, GstCaps * caps)
{
gchar *p, *tmp, *to_free;
guint i;
GstStructure *s;
g_return_val_if_fail (attributes != NULL, GST_SDP_EINVAL);
g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), GST_SDP_EINVAL);
s = gst_caps_get_structure (caps, 0);
for (i = 0; i < attributes->len; i++) {
const gchar *value;
GstSDPAttribute *attr;
guint32 ssrc;
gchar *ssrc_val, *ssrc_attr;
gchar *key;
attr = &g_array_index (attributes, GstSDPAttribute, i);
if (strcmp (attr->key, "ssrc") != 0)
continue;
value = attr->value;
/* p is now of the format ssrc attribute[:value] */
to_free = p = g_strdup (value);
ssrc = strtoul (p, &tmp, 10);
if (*tmp != ' ') {
GST_ERROR ("Invalid ssrc attribute '%s'", to_free);
goto next;
}
/* At the space */
p = tmp;
SKIP_SPACES (p);
tmp = strstr (p, ":");
if (tmp == NULL) {
ssrc_attr = tmp;
ssrc_val = (gchar *) "";
} else {
ssrc_attr = p;
*tmp = '\0';
p = tmp + 1;
ssrc_val = p;
}
if (ssrc_attr == NULL || *ssrc_attr == '\0') {
GST_ERROR ("Invalid ssrc attribute '%s'", to_free);
goto next;
}
key = g_strdup_printf ("ssrc-%u-%s", ssrc, ssrc_attr);
gst_structure_set (s, key, G_TYPE_STRING, ssrc_val, NULL);
GST_DEBUG ("adding caps: %s=%s", key, ssrc_val);
g_free (key);
next:
g_free (to_free);
}
return GST_SDP_OK;
}
/* parses RID SDP attributes (RFC8851) into caps */
static GstSDPResult
gst_sdp_media_add_rid_attributes (GArray * attributes, GstCaps * caps)
@ -4551,6 +4620,11 @@ gst_sdp_media_attributes_to_caps (const GstSDPMedia * media, GstCaps * caps)
res = gst_sdp_media_add_extmap_attributes (media->attributes, caps);
}
if (res == GST_SDP_OK) {
/* parse media ssrc field */
res = gst_sdp_media_add_ssrc_attributes (media->attributes, caps);
}
if (res == GST_SDP_OK) {
/* parse media rid fields */
res = gst_sdp_media_add_rid_attributes (media->attributes, caps);