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gstutils: Add a utility to create a stream-id without a pad
We already have functions to generate a stream-id from pads but in the end those pads are not even used in most cases. This adds functions to generate a stream-id even before creating the source pads for the element that is going to use it. For example a demuxer that is properly implements the GstStream/GstStreamCollection API will not have a Pad but already needs to generate a stream-id. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3160>
This commit is contained in:
Thibault Saunier
GStreamer Marge Bot
parent
25b4e84fe5
commit
3963396716
2 changed files with 148 additions and 16 deletions
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@ -3968,28 +3968,16 @@ gst_util_fraction_compare (gint a_n, gint a_d, gint b_n, gint b_d)
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}
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static gchar *
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gst_pad_create_stream_id_internal (GstPad * pad, GstElement * parent,
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gst_element_decorate_stream_id_internal (GstElement * element,
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const gchar * stream_id)
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{
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GstEvent *upstream_event;
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gchar *upstream_stream_id = NULL, *new_stream_id;
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GstPad *sinkpad;
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g_return_val_if_fail (GST_IS_PAD (pad), NULL);
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g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
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g_return_val_if_fail (GST_IS_ELEMENT (parent), NULL);
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g_return_val_if_fail (parent->numsinkpads <= 1, NULL);
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/* If the element has multiple source pads it must
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* provide a stream-id for every source pad, otherwise
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* all source pads will have the same and are not
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* distinguishable */
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g_return_val_if_fail (parent->numsrcpads <= 1 || stream_id, NULL);
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/* First try to get the upstream stream-start stream-id from the sinkpad.
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* This will only work for non-source elements */
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sinkpad = gst_element_get_static_pad (parent, "sink");
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sinkpad = gst_element_get_static_pad (element, "sink");
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if (sinkpad) {
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upstream_event =
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gst_pad_get_sticky_event (sinkpad, GST_EVENT_STREAM_START, 0);
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@ -4013,7 +4001,7 @@ gst_pad_create_stream_id_internal (GstPad * pad, GstElement * parent,
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/* Try to generate one from the URI query and
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* if it fails take a random number instead */
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query = gst_query_new_uri ();
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if (gst_element_query (parent, query)) {
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if (gst_element_query (element, query)) {
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gst_query_parse_uri (query, &uri);
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}
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@ -4028,7 +4016,7 @@ gst_pad_create_stream_id_internal (GstPad * pad, GstElement * parent,
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g_checksum_free (cs);
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} else {
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/* Just get some random number if the URI query fails */
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GST_FIXME_OBJECT (pad, "Creating random stream-id, consider "
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GST_FIXME_OBJECT (element, "Creating random stream-id, consider "
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"implementing a deterministic way of creating a stream-id");
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upstream_stream_id =
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g_strdup_printf ("%08x%08x%08x%08x", g_random_int (), g_random_int (),
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@ -4049,6 +4037,139 @@ gst_pad_create_stream_id_internal (GstPad * pad, GstElement * parent,
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return new_stream_id;
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}
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/**
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* gst_element_decorate_stream_id_printf_valist:
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* @element: The #GstElement to create a stream-id for
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* @format: (not nullable): The stream-id
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* @var_args: parameters for the @format string
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*
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* Creates a stream-id for @element by combining the upstream information with
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* the @format.
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*
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* This function generates an unique stream-id by getting the upstream
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* stream-start event stream ID and appending @format to it. If the element
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* has no sinkpad it will generate an upstream stream-id by doing an URI query
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* on the element and in the worst case just uses a random number. Source
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* elements that don't implement the URI handler interface should ideally
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* generate a unique, deterministic stream-id manually instead.
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*
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* Since stream IDs are sorted alphabetically, any numbers in the stream ID
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* should be printed with a fixed number of characters, preceded by 0's, such as
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* by using the format \%03u instead of \%u.
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*
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* Returns: (transfer full): A stream-id for @element.
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*
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* Since: 1.24
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*/
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gchar *
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gst_element_decorate_stream_id_printf_valist (GstElement * element,
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const gchar * format, va_list var_args)
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{
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gchar *stream_id, *res;
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g_return_val_if_fail (format, NULL);
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stream_id = g_strdup_vprintf (format, var_args);
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res = gst_element_decorate_stream_id_internal (element, stream_id);
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g_free (stream_id);
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return res;
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}
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/**
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* gst_element_decorate_stream_id_printf:
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* @element: The #GstElement to create a stream-id for
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* @format: (not nullable): The stream-id
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*
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* Creates a stream-id for @element by combining the upstream information with
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* the @format.
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*
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* This function generates an unique stream-id by getting the upstream
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* stream-start event stream ID and appending the stream-id to it. If the element
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* has no sinkpad it will generate an upstream stream-id by doing an URI query
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* on the element and in the worst case just uses a random number. Source
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* elements that don't implement the URI handler interface should ideally
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* generate a unique, deterministic stream-id manually instead.
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*
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* Since stream IDs are sorted alphabetically, any numbers in the stream ID
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* should be printed with a fixed number of characters, preceded by 0's, such as
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* by using the format \%03u instead of \%u.
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*
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* Returns: (transfer full): A stream-id for @element.
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*
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* Since: 1.24
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*/
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gchar *
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gst_element_decorate_stream_id_printf (GstElement * element,
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const gchar * format, ...)
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{
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gchar *res;
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va_list var_args;
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g_return_val_if_fail (format, NULL);
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va_start (var_args, format);
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res =
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gst_element_decorate_stream_id_printf_valist (element, format, var_args);
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va_end (var_args);
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return res;
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}
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/**
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* gst_element_decorate_stream_id:
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* @element: The #GstElement to create a stream-id for
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* @stream_id: (not nullable): The stream-id
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*
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* Creates a stream-id for @element by combining the upstream information with
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* the @stream_id.
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*
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* This function generates an unique stream-id by getting the upstream
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* stream-start event stream ID and appending @stream_id to it. If the element
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* has no sinkpad it will generate an upstream stream-id by doing an URI query
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* on the element and in the worst case just uses a random number. Source
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* elements that don't implement the URI handler interface should ideally
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* generate a unique, deterministic stream-id manually instead.
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*
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* Since stream IDs are sorted alphabetically, any numbers in the stream ID
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* should be printed with a fixed number of characters, preceded by 0's, such as
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* by using the format \%03u instead of \%u.
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*
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* Returns: (transfer full): A stream-id for @element.
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*
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* Since: 1.24
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*/
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gchar *
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gst_element_decorate_stream_id (GstElement * element, const gchar * stream_id)
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{
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g_return_val_if_fail (stream_id, NULL);
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g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
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return gst_element_decorate_stream_id_internal (element, stream_id);
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}
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static gchar *
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gst_pad_create_stream_id_internal (GstPad * pad, GstElement * parent,
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const gchar * stream_id)
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{
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g_return_val_if_fail (GST_IS_PAD (pad), NULL);
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g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
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g_return_val_if_fail (GST_IS_ELEMENT (parent), NULL);
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g_return_val_if_fail (parent->numsinkpads <= 1, NULL);
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/* If the element has multiple source pads it must
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* provide a stream-id for every source pad, otherwise
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* all source pads will have the same and are not
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* distinguishable */
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g_return_val_if_fail (parent->numsrcpads <= 1 || stream_id, NULL);
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return gst_element_decorate_stream_id_internal (parent, stream_id);
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}
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/**
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* gst_pad_create_stream_id_printf_valist:
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* @pad: A source #GstPad
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@ -1034,6 +1034,17 @@ gboolean gst_element_seek_simple (GstElement *element,
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GstSeekFlags seek_flags,
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gint64 seek_pos);
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GST_API
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gchar * gst_element_decorate_stream_id (GstElement *element,
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const gchar *stream_id);
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GST_API
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gchar * gst_element_decorate_stream_id_printf_valist (GstElement * element,
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const gchar * format,
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va_list var_args) G_GNUC_PRINTF (2, 0) G_GNUC_MALLOC;;
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GST_API
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gchar * gst_element_decorate_stream_id_printf (GstElement * element,
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const gchar * format,
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...) G_GNUC_PRINTF (2, 3) G_GNUC_MALLOC;;
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/* util elementfactory functions */
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GST_API
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