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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-24 17:20:36 +00:00
sdp: Add support for parsing the extmap attribute from caps and storing inside caps
The extmap attribute allows mapping RTP extension header IDs to well-known RTP extension header specifications. See RFC8285 for details. We store the extmap attribute either as string in the caps extmap-X=extensionname where X is the integer extension header ID, or as 3-tuple of strings extmap-X=<direction,extensionname,extensionattributes> where direction or extensionattributes are allowed to be the empty string. Both formats are allowed because usually only the extension name is given and it's much simpler to handle in caps.
This commit is contained in:
Sebastian Dröge
Nicolas Dufresne
parent
6d49814932
commit
1381e3e2be
2 changed files with 271 additions and 1 deletions
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@ -3553,6 +3553,8 @@ gst_sdp_media_add_rtcp_fb_attributes_from_media (const GstSDPMedia * media,
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*
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* a=fmtp:(payload) (param)[=(value)];...
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*
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* Note that the extmap attribute is set only by gst_sdp_media_attributes_to_caps().
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*
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* Returns: a #GstCaps, or %NULL if an error happened
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*
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* Since: 1.8
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@ -3752,6 +3754,8 @@ no_rate:
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*
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* a=rtcp-fb:(payload) (param1) [param2]...
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*
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* a=extmap:(id)[/direction] (extensionname) (extensionattributes)
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*
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* Returns: a #GstSDPResult.
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*
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* Since: 1.8
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@ -3829,7 +3833,7 @@ gst_sdp_media_set_media_from_caps (const GstCaps * caps, GstSDPMedia * media)
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}
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}
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/* collect all other properties and add them to fmtp or attributes */
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/* collect all other properties and add them to fmtp, extmap or attributes */
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fmtp = g_string_new ("");
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g_string_append_printf (fmtp, "%d ", caps_pt);
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first = TRUE;
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@ -3889,6 +3893,63 @@ gst_sdp_media_set_media_from_caps (const GstCaps * caps, GstSDPMedia * media)
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continue;
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}
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/* extmap */
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if (g_str_has_prefix (fname, "extmap-")) {
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gchar *endptr;
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guint id = strtoull (fname + 7, &endptr, 10);
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const GValue *arr;
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if (*endptr != '\0' || id == 0 || id == 15 || id > 9999)
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continue;
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if ((fval = gst_structure_get_string (s, fname))) {
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gchar *extmap = g_strdup_printf ("%u %s", id, fval);
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gst_sdp_media_add_attribute (media, "extmap", extmap);
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g_free (extmap);
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} else if ((arr = gst_structure_get_value (s, fname))
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&& G_VALUE_HOLDS (arr, GST_TYPE_ARRAY)
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&& gst_value_array_get_size (arr) == 3) {
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const GValue *val;
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const gchar *direction, *extensionname, *extensionattributes;
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val = gst_value_array_get_value (arr, 0);
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direction = g_value_get_string (val);
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val = gst_value_array_get_value (arr, 1);
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extensionname = g_value_get_string (val);
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val = gst_value_array_get_value (arr, 2);
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extensionattributes = g_value_get_string (val);
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if (!extensionname || *extensionname == '\0')
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continue;
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if (direction && *direction != '\0' && extensionattributes
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&& *extensionattributes != '\0') {
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gchar *extmap =
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g_strdup_printf ("%u/%s %s %s", id, direction, extensionname,
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extensionattributes);
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gst_sdp_media_add_attribute (media, "extmap", extmap);
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g_free (extmap);
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} else if (direction && *direction != '\0') {
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gchar *extmap =
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g_strdup_printf ("%u/%s %s", id, direction, extensionname);
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gst_sdp_media_add_attribute (media, "extmap", extmap);
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g_free (extmap);
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} else if (extensionattributes && *extensionattributes != '\0') {
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gchar *extmap = g_strdup_printf ("%u %s %s", id, extensionname,
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extensionattributes);
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gst_sdp_media_add_attribute (media, "extmap", extmap);
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g_free (extmap);
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} else {
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gchar *extmap = g_strdup_printf ("%u %s", id, extensionname);
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gst_sdp_media_add_attribute (media, "extmap", extmap);
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g_free (extmap);
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}
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}
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continue;
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}
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if ((fval = gst_structure_get_string (s, fname))) {
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g_string_append_printf (fmtp, "%s%s=%s", first ? "" : ";", fname, fval);
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first = FALSE;
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@ -4056,6 +4117,8 @@ sdp_add_attributes_to_caps (GArray * attributes, GstCaps * caps)
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continue;
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if (!strcmp (key, "key-mgmt"))
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continue;
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if (!strcmp (key, "extmap"))
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continue;
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/* string must be valid UTF8 */
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if (!g_utf8_validate (attr->value, -1, NULL))
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@ -4075,6 +4138,112 @@ sdp_add_attributes_to_caps (GArray * attributes, GstCaps * caps)
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return GST_SDP_OK;
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}
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static GstSDPResult
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gst_sdp_media_add_extmap_attributes (GArray * attributes, GstCaps * caps)
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{
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const gchar *extmap;
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gchar *p, *tmp, *to_free;
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guint id, i;
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GstStructure *s;
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g_return_val_if_fail (attributes != NULL, GST_SDP_EINVAL);
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g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), GST_SDP_EINVAL);
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s = gst_caps_get_structure (caps, 0);
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for (i = 0; i < attributes->len; i++) {
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GstSDPAttribute *attr;
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const gchar *direction, *extensionname, *extensionattributes;
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attr = &g_array_index (attributes, GstSDPAttribute, i);
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if (strcmp (attr->key, "extmap") != 0)
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continue;
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extmap = attr->value;
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/* p is now of the format id[/direction] extensionname [extensionattributes] */
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to_free = p = g_strdup (extmap);
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id = strtoul (p, &tmp, 10);
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if (id == 0 || id == 15 || id > 9999 || (*tmp != ' ' && *tmp != '/')) {
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GST_ERROR ("Invalid extmap '%s'", to_free);
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goto next;
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} else if (*tmp == '/') {
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p = tmp;
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p++;
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PARSE_STRING (p, " ", direction);
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/* Invalid format */
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if (direction == NULL || *direction == '\0') {
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GST_ERROR ("Invalid extmap '%s'", to_free);
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goto next;
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}
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} else {
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/* At the space */
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p = tmp;
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direction = "";
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}
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SKIP_SPACES (p);
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tmp = strstr (p, " ");
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if (tmp == NULL) {
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extensionname = p;
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extensionattributes = "";
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} else {
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extensionname = p;
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*tmp = '\0';
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p = tmp + 1;
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SKIP_SPACES (p);
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extensionattributes = p;
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}
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if (extensionname == NULL || *extensionname == '\0') {
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GST_ERROR ("Invalid extmap '%s'", to_free);
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goto next;
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}
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if (*direction != '\0' || *extensionattributes != '\0') {
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GValue arr = G_VALUE_INIT;
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GValue val = G_VALUE_INIT;
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gchar *key;
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key = g_strdup_printf ("extmap-%u", id);
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g_value_init (&arr, GST_TYPE_ARRAY);
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g_value_init (&val, G_TYPE_STRING);
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g_value_set_string (&val, direction);
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gst_value_array_append_value (&arr, &val);
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g_value_set_string (&val, extensionname);
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gst_value_array_append_value (&arr, &val);
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g_value_set_string (&val, extensionattributes);
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gst_value_array_append_value (&arr, &val);
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gst_structure_set_value (s, key, &arr);
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g_value_unset (&val);
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g_value_unset (&arr);
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GST_DEBUG ("adding caps: %s=<%s,%s,%s>", key, direction, extensionname,
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extensionattributes);
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g_free (key);
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} else {
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gchar *key;
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key = g_strdup_printf ("extmap-%u", id);
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gst_structure_set (s, key, G_TYPE_STRING, extensionname, NULL);
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GST_DEBUG ("adding caps: %s=%s", key, extensionname);
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g_free (key);
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}
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next:
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g_free (to_free);
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}
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return GST_SDP_OK;
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}
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/**
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* gst_sdp_message_attributes_to_caps:
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* @msg: a #GstSDPMessage
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@ -4105,6 +4274,11 @@ gst_sdp_message_attributes_to_caps (const GstSDPMessage * msg, GstCaps * caps)
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res = sdp_add_attributes_to_caps (msg->attributes, caps);
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if (res == GST_SDP_OK) {
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/* parse global extmap field */
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res = gst_sdp_media_add_extmap_attributes (msg->attributes, caps);
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}
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done:
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if (mikey)
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gst_mikey_message_unref (mikey);
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@ -4141,6 +4315,11 @@ gst_sdp_media_attributes_to_caps (const GstSDPMedia * media, GstCaps * caps)
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res = sdp_add_attributes_to_caps (media->attributes, caps);
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if (res == GST_SDP_OK) {
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/* parse media extmap field */
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res = gst_sdp_media_add_extmap_attributes (media->attributes, caps);
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}
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done:
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if (mikey)
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gst_mikey_message_unref (mikey);
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@ -125,6 +125,26 @@ static const gchar caps_video_rtcp_fb_all_pt_102[] =
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"clock-rate=(int)90000, encoding-name=(string)H264, "
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"rtcp-fb-nack=(boolean)true, rtcp-fb-nack-pli=(boolean)true";
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static const gchar * sdp_extmap = "v=0\r\n"
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"o=- 123456 2 IN IP4 127.0.0.1 \r\n"
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"s=-\r\n"
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"t=0 0\r\n"
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"a=maxptime:60\r\n"
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"a=sendrecv\r\n"
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"m=video 1 UDP/TLS/RTP/SAVPF 100 101 102\r\n"
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"c=IN IP4 1.1.1.1\r\n"
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"a=rtpmap:100 VP8/90000\r\n"
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"a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\r\n"
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"a=extmap:3/recvonly http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\n"
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"a=extmap:4 urn:3gpp:video-orientation attributes\r\n";
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static const gchar caps_video_extmap_pt_100[] =
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"application/x-unknown, media=(string)video, payload=(int)100, "
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"clock-rate=(int)90000, encoding-name=(string)VP8, "
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"extmap-2=urn:ietf:params:rtp-hdrext:toffset, "
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"extmap-3=(string)<\"recvonly\",\"http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\",\"\">, "
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"extmap-4=(string)<\"\",\"urn:3gpp:video-orientation\",\"attributes\">";
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/* *INDENT-ON* */
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GST_START_TEST (boxed)
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@ -535,6 +555,75 @@ GST_START_TEST (media_from_caps_rtcp_fb_pt_101)
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gst_sdp_message_free (message);
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}
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GST_END_TEST
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GST_START_TEST (caps_from_media_extmap)
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{
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GstSDPMessage *message;
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glong length = -1;
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const GstSDPMedia *media1;
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GstCaps *caps1;
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GstCaps *result1;
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gst_sdp_message_new (&message);
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gst_sdp_message_parse_buffer ((guint8 *) sdp_extmap, length, message);
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media1 = gst_sdp_message_get_media (message, 0);
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fail_unless (media1 != NULL);
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caps1 = gst_sdp_media_get_caps_from_media (media1, 100);
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gst_sdp_media_attributes_to_caps (media1, caps1);
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result1 = gst_caps_from_string (caps_video_extmap_pt_100);
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fail_unless (gst_caps_is_strictly_equal (caps1, result1));
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gst_caps_unref (result1);
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gst_caps_unref (caps1);
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gst_sdp_message_free (message);
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}
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GST_END_TEST
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GST_START_TEST (media_from_caps_extmap_pt_100)
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{
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GstSDPResult ret = GST_SDP_OK;
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GstSDPMessage *message;
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glong length = -1;
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GstSDPMedia *media_caps;
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const GstSDPMedia *media_sdp;
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GstCaps *caps;
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const gchar *attr_val_caps1, *attr_val_caps2, *attr_val_caps3;
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const gchar *attr_val_sdp1, *attr_val_sdp2, *attr_val_sdp3;
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caps = gst_caps_from_string (caps_video_extmap_pt_100);
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gst_sdp_media_new (&media_caps);
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fail_unless (media_caps != NULL);
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ret = gst_sdp_media_set_media_from_caps (caps, media_caps);
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fail_unless (ret == GST_SDP_OK);
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gst_caps_unref (caps);
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gst_sdp_message_new (&message);
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gst_sdp_message_parse_buffer ((guint8 *) sdp_extmap, length, message);
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media_sdp = gst_sdp_message_get_media (message, 0);
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fail_unless (media_sdp != NULL);
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attr_val_caps1 = gst_sdp_media_get_attribute_val_n (media_caps, "extmap", 0);
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attr_val_caps2 = gst_sdp_media_get_attribute_val_n (media_caps, "extmap", 1);
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attr_val_caps3 = gst_sdp_media_get_attribute_val_n (media_caps, "extmap", 2);
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attr_val_sdp1 = gst_sdp_media_get_attribute_val_n (media_sdp, "extmap", 0);
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attr_val_sdp2 = gst_sdp_media_get_attribute_val_n (media_sdp, "extmap", 1);
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attr_val_sdp3 = gst_sdp_media_get_attribute_val_n (media_sdp, "extmap", 2);
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fail_if (g_strcmp0 (attr_val_caps1, attr_val_sdp1) != 0);
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fail_if (g_strcmp0 (attr_val_caps2, attr_val_sdp2) != 0);
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fail_if (g_strcmp0 (attr_val_caps3, attr_val_sdp3) != 0);
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gst_sdp_media_free (media_caps);
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gst_sdp_message_free (message);
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}
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GST_END_TEST
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GST_START_TEST (caps_from_media_really_const)
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{
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@ -588,8 +677,10 @@ sdp_suite (void)
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tcase_add_test (tc_chain, media_from_caps);
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tcase_add_test (tc_chain, caps_from_media_rtcp_fb);
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tcase_add_test (tc_chain, caps_from_media_rtcp_fb_all);
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tcase_add_test (tc_chain, caps_from_media_extmap);
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tcase_add_test (tc_chain, media_from_caps_rtcp_fb_pt_100);
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tcase_add_test (tc_chain, media_from_caps_rtcp_fb_pt_101);
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tcase_add_test (tc_chain, media_from_caps_extmap_pt_100);
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return s;
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}
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