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decodebin3: Allow re-using inputs
DecodebinInput (and their backing parsebin or identity) are no longer released when the corresponding sinkpad is unlinked, but when it's released. The parsebin element will be resetted: * If incoming caps are incompatible (was the case before) * Or when unlinking and it was previously pull-based This opens the way to use decodebin3 with changing inputs (i.e. gapless) Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2784>
This commit is contained in:
Edward Hervey
GStreamer Marge Bot
parent
1f8d8b2df6
commit
f785b3d584
1 changed files with 100 additions and 27 deletions
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@ -481,6 +481,7 @@ gst_decodebin3_select_stream (GstDecodebin3 * dbin,
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static GstPad *gst_decodebin3_request_new_pad (GstElement * element,
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GstPadTemplate * temp, const gchar * name, const GstCaps * caps);
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static void gst_decodebin3_release_pad (GstElement * element, GstPad * pad);
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static void handle_stream_collection (GstDecodebin3 * dbin,
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GstStreamCollection * collection, DecodebinInput * input);
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static void gst_decodebin3_handle_message (GstBin * bin, GstMessage * message);
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@ -496,7 +497,6 @@ static gboolean have_factory (GstDecodebin3 * dbin, GstCaps * caps,
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#endif
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static void free_input (GstDecodebin3 * dbin, DecodebinInput * input);
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static void free_input_async (GstDecodebin3 * dbin, DecodebinInput * input);
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static DecodebinInput *create_new_input (GstDecodebin3 * dbin, gboolean main);
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static gboolean set_input_group_id (DecodebinInput * input, guint32 * group_id);
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@ -594,6 +594,7 @@ gst_decodebin3_class_init (GstDecodebin3Class * klass)
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GST_DEBUG_FUNCPTR (gst_decodebin3_request_new_pad);
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_decodebin3_change_state);
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element_class->send_event = GST_DEBUG_FUNCPTR (gst_decodebin3_send_event);
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element_class->release_pad = GST_DEBUG_FUNCPTR (gst_decodebin3_release_pad);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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@ -772,9 +773,11 @@ set_input_group_id (DecodebinInput * input, guint32 * group_id)
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}
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if (*group_id != dbin->current_group_id) {
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/* The input is being re-used with a different incoming stream, we do want
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* to change/unify to this new group-id */
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if (dbin->current_group_id == GST_GROUP_ID_INVALID) {
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GST_DEBUG_OBJECT (dbin, "Setting current group id to %" G_GUINT32_FORMAT,
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*group_id);
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GST_DEBUG_OBJECT (dbin,
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"Setting current group id to %" G_GUINT32_FORMAT, *group_id);
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dbin->current_group_id = *group_id;
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}
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*group_id = dbin->current_group_id;
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@ -889,8 +892,15 @@ gst_decodebin3_input_pad_link (GstPad * pad, GstObject * parent, GstPad * peer)
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* processing) to figure out if one is really needed or whether an identity
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* element will be enough */
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INPUT_LOCK (dbin);
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if (pull_mode && !ensure_input_parsebin (dbin, input))
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res = GST_PAD_LINK_REFUSED;
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if (pull_mode) {
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if (!ensure_input_parsebin (dbin, input))
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res = GST_PAD_LINK_REFUSED;
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else if (input->identity) {
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GST_ERROR_OBJECT (dbin,
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"Can't reconfigure input from push-based to pull-based");
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res = GST_PAD_LINK_REFUSED;
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}
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}
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INPUT_UNLOCK (dbin);
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return res;
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@ -915,18 +925,86 @@ query_duration_drop_probe (GstPad * pad, GstPadProbeInfo * info,
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}
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static void
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gst_decodebin3_input_pad_unlink (GstPad * pad, GstObject * parent)
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recalculate_group_id (GstDecodebin3 * dbin)
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{
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GstDecodebin3 *dbin = (GstDecodebin3 *) parent;
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guint32 common_group_id;
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GList *iter;
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common_group_id = dbin->main_input->group_id;
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for (iter = dbin->other_inputs; iter; iter = iter->next) {
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DecodebinInput *input = iter->data;
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if (input->group_id != common_group_id)
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return;
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}
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GST_DEBUG_OBJECT (dbin, "Updating global group_id to %" G_GUINT32_FORMAT,
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common_group_id);
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dbin->current_group_id = common_group_id;
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}
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/* CALL with INPUT LOCK */
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static void
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reset_input_parsebin (GstDecodebin3 * dbin, DecodebinInput * input)
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{
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GList *iter;
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if (input->parsebin == NULL)
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return;
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GST_DEBUG_OBJECT (dbin, "Resetting %" GST_PTR_FORMAT, input->parsebin);
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GST_STATE_LOCK (dbin);
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gst_element_set_state (input->parsebin, GST_STATE_NULL);
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input->drained = FALSE;
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input->group_id = GST_GROUP_ID_INVALID;
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recalculate_group_id (dbin);
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for (iter = dbin->input_streams; iter; iter = iter->next) {
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DecodebinInputStream *istream = iter->data;
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if (istream->input == input)
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istream->saw_eos = TRUE;
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}
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gst_element_sync_state_with_parent (input->parsebin);
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GST_STATE_UNLOCK (dbin);
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}
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static void
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gst_decodebin3_input_pad_unlink (GstPad * pad, GstPad * peer,
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DecodebinInput * input)
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{
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GstDecodebin3 *dbin = input->dbin;
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g_return_if_fail (input);
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GST_LOG_OBJECT (dbin, "Got unlink on input pad %" GST_PTR_FORMAT, pad);
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INPUT_LOCK (dbin);
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if (input->parsebin == NULL) {
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INPUT_UNLOCK (dbin);
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return;
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}
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if (GST_PAD_MODE (pad) == GST_PAD_MODE_PULL) {
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GST_DEBUG_OBJECT (dbin, "Resetting parsebin since it's pull-based");
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reset_input_parsebin (dbin, input);
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}
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INPUT_UNLOCK (dbin);
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}
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static void
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gst_decodebin3_release_pad (GstElement * element, GstPad * pad)
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{
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GstDecodebin3 *dbin = (GstDecodebin3 *) element;
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DecodebinInput *input = g_object_get_data (G_OBJECT (pad), "decodebin.input");
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GstStreamCollection *collection = NULL;
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gulong probe_id = 0;
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GstMessage *msg;
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g_return_if_fail (input);
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GST_LOG_OBJECT (parent, "Got unlink on input pad %" GST_PTR_FORMAT
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". Removing parsebin.", pad);
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GST_LOG_OBJECT (dbin, "Releasing pad %" GST_PTR_FORMAT, pad);
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INPUT_LOCK (dbin);
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@ -996,7 +1074,7 @@ gst_decodebin3_input_pad_unlink (GstPad * pad, GstObject * parent)
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if (!input->is_main) {
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dbin->other_inputs = g_list_remove (dbin->other_inputs, input);
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free_input_async (dbin, input);
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free_input (dbin, input);
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}
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beach:
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@ -1004,11 +1082,12 @@ beach:
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return;
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}
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/* Call with INPUT LOCK */
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static void
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free_input (GstDecodebin3 * dbin, DecodebinInput * input)
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{
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GST_DEBUG ("Freeing input %p", input);
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INPUT_LOCK (dbin);
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gst_ghost_pad_set_target (GST_GHOST_PAD (input->ghost_sink), NULL);
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gst_element_remove_pad (GST_ELEMENT (dbin), input->ghost_sink);
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if (input->parsebin) {
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@ -1030,15 +1109,6 @@ free_input (GstDecodebin3 * dbin, DecodebinInput * input)
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if (input->collection)
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gst_object_unref (input->collection);
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g_free (input);
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INPUT_UNLOCK (dbin);
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}
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static void
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free_input_async (GstDecodebin3 * dbin, DecodebinInput * input)
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{
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GST_LOG_OBJECT (dbin, "pushing input %p on thread pool to free", input);
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gst_element_call_async (GST_ELEMENT_CAST (dbin),
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(GstElementCallAsyncFunc) free_input, input, NULL);
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}
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static gboolean
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@ -1165,6 +1235,10 @@ sink_event_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstEvent * event)
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inputs is. This means things might break if there's a mix */
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if (input->upstream_selected)
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dbin->upstream_selected = TRUE;
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/* Make sure group ids will be recalculated */
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input->group_id = GST_GROUP_ID_INVALID;
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recalculate_group_id (dbin);
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break;
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}
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case GST_EVENT_STREAM_COLLECTION:
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@ -1235,11 +1309,10 @@ sink_event_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstEvent * event)
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if (!gst_pad_query_accept_caps (input->parsebin_sink, newcaps)) {
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GST_DEBUG_OBJECT (sinkpad,
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"Parsebin doesn't accept the new caps %" GST_PTR_FORMAT, newcaps);
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GST_STATE_LOCK (dbin);
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/* Reset parsebin so that it reconfigures itself for the new stream format */
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gst_element_set_state (input->parsebin, GST_STATE_NULL);
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gst_element_sync_state_with_parent (input->parsebin);
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GST_STATE_UNLOCK (dbin);
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INPUT_LOCK (dbin);
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reset_input_parsebin (dbin, input);
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INPUT_UNLOCK (dbin);
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} else {
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GST_DEBUG_OBJECT (sinkpad, "Parsebin accepts new caps");
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}
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@ -1277,8 +1350,8 @@ create_new_input (GstDecodebin3 * dbin, gboolean main)
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gst_pad_set_query_function (input->ghost_sink,
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(GstPadQueryFunction) sink_query_function);
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gst_pad_set_link_function (input->ghost_sink, gst_decodebin3_input_pad_link);
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gst_pad_set_unlink_function (input->ghost_sink,
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gst_decodebin3_input_pad_unlink);
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g_signal_connect (input->ghost_sink, "unlinked",
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(GCallback) gst_decodebin3_input_pad_unlink, input);
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gst_pad_set_active (input->ghost_sink, TRUE);
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gst_element_add_pad ((GstElement *) dbin, input->ghost_sink);
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