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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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952f252104
In `parse_chain_output_probe()` the corresponding input stream might receive EOS and thus be removed before the actual pad is removed. So we cannot assert about this in `parsebin_pad_removed_cb()`. Also, driving-by, protect `find_input_stream_for_pad()` with the selection lock similarly to other functions accessing the input streams list. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5887>
609 lines
19 KiB
C
609 lines
19 KiB
C
/* GStreamer
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*
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* Copyright (C) <2015> Centricular Ltd
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* @author: Edward Hervey <edward@centricular.com>
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* @author: Jan Schmidt <jan@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#if 0
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/* Not needed for now - we're including gstdecodebin3-parse.c into gstdecodebin3.c */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include <glib-object.h>
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#include <glib/gprintf.h>
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#include <gst/gst.h>
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#include <gst/pbutils/pbutils.h>
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#include "gstplayback.h"
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#endif
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#define CUSTOM_EOS_QUARK _custom_eos_quark_get ()
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#define CUSTOM_EOS_QUARK_DATA "custom-eos"
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static GQuark
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_custom_eos_quark_get (void)
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{
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static gsize g_quark;
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if (g_once_init_enter (&g_quark)) {
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gsize quark = (gsize) g_quark_from_static_string ("decodebin3-custom-eos");
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g_once_init_leave (&g_quark, quark);
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}
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return g_quark;
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}
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/* Streams that come from parsebin or identity */
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/* FIXME : All this is hardcoded. Switch to tree of chains */
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struct _DecodebinInputStream
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{
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GstDecodebin3 *dbin;
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GstStream *active_stream;
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DecodebinInput *input;
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GstPad *srcpad; /* From parsebin or identity */
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/* id of the pad event probe */
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gulong output_event_probe_id;
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/* id of the buffer blocking probe on the parsebin srcpad pad */
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gulong buffer_probe_id;
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/* Whether we saw an EOS on input. This should be treated accordingly
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* when the stream is no longer used */
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gboolean saw_eos;
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};
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static void unblock_pending_input (DecodebinInput * input,
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gboolean unblock_other_inputs);
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static void parsebin_pad_added_cb (GstElement * demux, GstPad * pad,
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DecodebinInput * input);
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static void parsebin_pad_removed_cb (GstElement * demux, GstPad * pad,
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DecodebinInput * input);
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/* WITH SELECTION_LOCK TAKEN! */
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static gboolean
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all_inputs_are_eos (GstDecodebin3 * dbin)
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{
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GList *tmp;
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/* First check input streams */
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for (tmp = dbin->input_streams; tmp; tmp = tmp->next) {
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DecodebinInputStream *input = (DecodebinInputStream *) tmp->data;
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if (input->saw_eos == FALSE)
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return FALSE;
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}
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GST_DEBUG_OBJECT (dbin, "All input streams are EOS");
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return TRUE;
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}
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/* WITH SELECTION_LOCK TAKEN! */
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static void
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check_all_streams_for_eos (GstDecodebin3 * dbin, GstEvent * event)
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{
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GList *tmp;
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GList *outputpads = NULL;
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if (!all_inputs_are_eos (dbin))
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return;
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/* We know all streams are EOS, properly clean up everything */
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/* We grab all peer pads *while* the selection lock is taken and then we will
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push EOS downstream with the selection lock released */
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for (tmp = dbin->input_streams; tmp; tmp = tmp->next) {
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DecodebinInputStream *input = (DecodebinInputStream *) tmp->data;
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GstPad *peer = gst_pad_get_peer (input->srcpad);
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/* Keep a reference to the peer pad */
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if (peer)
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outputpads = g_list_append (outputpads, peer);
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}
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SELECTION_UNLOCK (dbin);
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for (tmp = outputpads; tmp; tmp = tmp->next) {
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GstPad *peer = (GstPad *) tmp->data;
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/* Send EOS and then remove elements */
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gst_pad_send_event (peer, gst_event_ref (event));
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GST_FIXME_OBJECT (peer, "Remove input stream");
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gst_object_unref (peer);
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}
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SELECTION_LOCK (dbin);
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g_list_free (outputpads);
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}
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/* Get the intersection of parser caps and available (sorted) decoders */
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static GstCaps *
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get_parser_caps_filter (GstDecodebin3 * dbin, GstCaps * caps)
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{
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GList *tmp;
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GstCaps *filter_caps;
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/* If no filter was provided, it can handle anything */
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if (!caps || gst_caps_is_any (caps))
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return gst_caps_new_any ();
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filter_caps = gst_caps_new_empty ();
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g_mutex_lock (&dbin->factories_lock);
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gst_decode_bin_update_factories_list (dbin);
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for (tmp = dbin->decoder_factories; tmp; tmp = tmp->next) {
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GstElementFactory *factory = (GstElementFactory *) tmp->data;
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GstCaps *tcaps, *intersection;
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const GList *tmps;
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GST_LOG ("Trying factory %s",
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gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
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for (tmps = gst_element_factory_get_static_pad_templates (factory); tmps;
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tmps = tmps->next) {
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GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
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if (st->direction != GST_PAD_SINK || st->presence != GST_PAD_ALWAYS)
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continue;
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tcaps = gst_static_pad_template_get_caps (st);
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intersection =
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gst_caps_intersect_full (tcaps, caps, GST_CAPS_INTERSECT_FIRST);
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filter_caps = gst_caps_merge (filter_caps, intersection);
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gst_caps_unref (tcaps);
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}
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}
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g_mutex_unlock (&dbin->factories_lock);
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GST_DEBUG_OBJECT (dbin, "Got filter caps %" GST_PTR_FORMAT, filter_caps);
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return filter_caps;
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}
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static gboolean
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check_parser_caps_filter (GstDecodebin3 * dbin, GstCaps * caps)
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{
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GList *tmp;
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gboolean res = FALSE;
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GstCaps *default_raw = gst_static_caps_get (&default_raw_caps);
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if (gst_caps_can_intersect (caps, default_raw)) {
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GST_INFO_OBJECT (dbin, "Dealing with raw stream from the demuxer, "
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" we can handle them even if we won't expose then");
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gst_caps_unref (default_raw);
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return TRUE;
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}
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gst_caps_unref (default_raw);
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g_mutex_lock (&dbin->factories_lock);
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gst_decode_bin_update_factories_list (dbin);
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for (tmp = dbin->decoder_factories; tmp; tmp = tmp->next) {
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GstElementFactory *factory = (GstElementFactory *) tmp->data;
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GstCaps *tcaps;
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const GList *tmps;
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GST_LOG ("Trying factory %s",
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gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
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for (tmps = gst_element_factory_get_static_pad_templates (factory); tmps;
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tmps = tmps->next) {
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GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
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if (st->direction != GST_PAD_SINK || st->presence != GST_PAD_ALWAYS)
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continue;
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tcaps = gst_static_pad_template_get_caps (st);
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if (gst_caps_can_intersect (tcaps, caps)) {
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res = TRUE;
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gst_caps_unref (tcaps);
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goto beach;
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}
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gst_caps_unref (tcaps);
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}
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}
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beach:
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g_mutex_unlock (&dbin->factories_lock);
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GST_DEBUG_OBJECT (dbin, "Can intersect %" GST_PTR_FORMAT ": %d", caps, res);
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return res;
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}
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/* Probe on the output of a parser chain (the last
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* src pad) */
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static GstPadProbeReturn
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parse_chain_output_probe (GstPad * pad, GstPadProbeInfo * info,
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DecodebinInputStream * input)
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{
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GstPadProbeReturn ret = GST_PAD_PROBE_OK;
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if (GST_IS_EVENT (GST_PAD_PROBE_INFO_DATA (info))) {
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GstEvent *ev = GST_PAD_PROBE_INFO_EVENT (info);
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GST_DEBUG_OBJECT (pad, "Got event %s", GST_EVENT_TYPE_NAME (ev));
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switch (GST_EVENT_TYPE (ev)) {
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case GST_EVENT_STREAM_START:
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{
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GstStream *stream = NULL;
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guint group_id = GST_GROUP_ID_INVALID;
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if (!gst_event_parse_group_id (ev, &group_id)) {
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GST_FIXME_OBJECT (pad,
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"Consider implementing group-id handling on stream-start event");
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group_id = gst_util_group_id_next ();
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}
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GST_DEBUG_OBJECT (pad, "Got stream-start, group_id:%d, input %p",
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group_id, input->input);
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if (set_input_group_id (input->input, &group_id)) {
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ev = gst_event_make_writable (ev);
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gst_event_set_group_id (ev, group_id);
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GST_PAD_PROBE_INFO_DATA (info) = ev;
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}
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input->saw_eos = FALSE;
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gst_event_parse_stream (ev, &stream);
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/* FIXME : Would we ever end up with a stream already set on the input ?? */
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if (stream) {
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if (input->active_stream != stream) {
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MultiQueueSlot *slot;
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if (input->active_stream)
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gst_object_unref (input->active_stream);
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input->active_stream = stream;
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/* We have the beginning of a stream, get a multiqueue slot and link to it */
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SELECTION_LOCK (input->dbin);
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slot = get_slot_for_input (input->dbin, input);
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link_input_to_slot (input, slot);
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SELECTION_UNLOCK (input->dbin);
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} else
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gst_object_unref (stream);
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}
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}
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break;
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case GST_EVENT_GAP:
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{
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/* If we are still waiting to be unblocked and we get a gap, unblock */
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if (input->buffer_probe_id) {
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GST_DEBUG_OBJECT (pad, "Got a gap event! Unblocking input(s) !");
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unblock_pending_input (input->input, TRUE);
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}
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break;
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}
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case GST_EVENT_CAPS:
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{
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GstCaps *caps = NULL;
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gst_event_parse_caps (ev, &caps);
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GST_DEBUG_OBJECT (pad, "caps %" GST_PTR_FORMAT, caps);
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if (caps && input->active_stream)
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gst_stream_set_caps (input->active_stream, caps);
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}
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break;
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case GST_EVENT_EOS:
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input->saw_eos = TRUE;
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if (all_inputs_are_eos (input->dbin)) {
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GST_DEBUG_OBJECT (pad, "real input pad, marking as EOS");
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SELECTION_LOCK (input->dbin);
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check_all_streams_for_eos (input->dbin, ev);
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SELECTION_UNLOCK (input->dbin);
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} else {
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GstPad *peer = gst_pad_get_peer (input->srcpad);
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if (peer) {
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/* Send custom-eos event to multiqueue slot */
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GstEvent *event;
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GST_DEBUG_OBJECT (pad,
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"Got EOS end of input stream, post custom-eos");
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event = gst_event_new_eos ();
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gst_event_set_seqnum (event, gst_event_get_seqnum (ev));
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gst_mini_object_set_qdata (GST_MINI_OBJECT_CAST (event),
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CUSTOM_EOS_QUARK, (gchar *) CUSTOM_EOS_QUARK_DATA, NULL);
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gst_pad_send_event (peer, event);
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gst_object_unref (peer);
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} else {
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GST_FIXME_OBJECT (pad, "No peer, what should we do ?");
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}
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}
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ret = GST_PAD_PROBE_DROP;
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break;
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case GST_EVENT_FLUSH_STOP:
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GST_DEBUG_OBJECT (pad, "Clear saw_eos flag");
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input->saw_eos = FALSE;
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default:
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break;
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}
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} else if (GST_IS_QUERY (GST_PAD_PROBE_INFO_DATA (info))) {
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if (input->input && input->input->identity) {
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GST_DEBUG_OBJECT (pad, "Letting query through");
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} else {
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GstQuery *q = GST_PAD_PROBE_INFO_QUERY (info);
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GST_DEBUG_OBJECT (pad, "Seeing query %" GST_PTR_FORMAT, q);
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/* If we have a parser, we want to reply to the caps query */
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/* FIXME: Set a flag when the input stream is created for
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* streams where we shouldn't reply to these queries */
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if (GST_QUERY_TYPE (q) == GST_QUERY_CAPS
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&& (info->type & GST_PAD_PROBE_TYPE_PULL)) {
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GstCaps *filter = NULL;
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GstCaps *allowed;
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gst_query_parse_caps (q, &filter);
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allowed = get_parser_caps_filter (input->dbin, filter);
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GST_DEBUG_OBJECT (pad,
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"Intercepting caps query, setting %" GST_PTR_FORMAT, allowed);
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gst_query_set_caps_result (q, allowed);
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gst_caps_unref (allowed);
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ret = GST_PAD_PROBE_HANDLED;
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} else if (GST_QUERY_TYPE (q) == GST_QUERY_ACCEPT_CAPS) {
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GstCaps *prop = NULL;
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gst_query_parse_accept_caps (q, &prop);
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/* Fast check against target caps */
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if (gst_caps_can_intersect (prop, input->dbin->caps)) {
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gst_query_set_accept_caps_result (q, TRUE);
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} else {
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gboolean accepted = check_parser_caps_filter (input->dbin, prop);
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/* check against caps filter */
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gst_query_set_accept_caps_result (q, accepted);
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GST_DEBUG_OBJECT (pad, "ACCEPT_CAPS query, returning %d", accepted);
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}
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ret = GST_PAD_PROBE_HANDLED;
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}
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}
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}
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return ret;
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}
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static GstPadProbeReturn
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parsebin_buffer_probe (GstPad * pad, GstPadProbeInfo * info,
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DecodebinInput * input)
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{
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/* We have at least one buffer pending, unblock parsebin(s) */
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GST_DEBUG_OBJECT (pad, "Got a buffer ! unblocking");
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unblock_pending_input (input, TRUE);
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return GST_PAD_PROBE_OK;
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}
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/* Call with selection lock */
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static DecodebinInputStream *
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create_input_stream (GstDecodebin3 * dbin, GstPad * pad, DecodebinInput * input)
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{
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DecodebinInputStream *res = g_new0 (DecodebinInputStream, 1);
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GST_DEBUG_OBJECT (dbin, "Creating input stream for %" GST_PTR_FORMAT, pad);
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res->dbin = dbin;
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res->input = input;
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res->srcpad = gst_object_ref (pad);
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/* Put probe on output source pad (for detecting EOS/STREAM_START/FLUSH) */
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res->output_event_probe_id =
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gst_pad_add_probe (pad,
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GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM
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| GST_PAD_PROBE_TYPE_EVENT_FLUSH,
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(GstPadProbeCallback) parse_chain_output_probe, res, NULL);
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/* Install a blocking buffer probe */
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res->buffer_probe_id =
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gst_pad_add_probe (pad,
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GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_BUFFER,
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(GstPadProbeCallback) parsebin_buffer_probe, input, NULL);
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/* Add to list of current input streams */
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dbin->input_streams = g_list_append (dbin->input_streams, res);
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GST_DEBUG_OBJECT (pad, "Done creating input stream");
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return res;
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}
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/* WITH SELECTION_LOCK TAKEN! */
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static void
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remove_input_stream (GstDecodebin3 * dbin, DecodebinInputStream * stream)
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{
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MultiQueueSlot *slot;
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GST_DEBUG_OBJECT (dbin, "Removing input stream %p (%s)", stream,
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stream->active_stream ? gst_stream_get_stream_id (stream->active_stream) :
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"<NONE>");
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gst_object_replace ((GstObject **) & stream->active_stream, NULL);
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/* Unlink from slot */
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if (stream->srcpad) {
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GstPad *peer;
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peer = gst_pad_get_peer (stream->srcpad);
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if (peer) {
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gst_pad_unlink (stream->srcpad, peer);
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gst_object_unref (peer);
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}
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if (stream->buffer_probe_id)
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gst_pad_remove_probe (stream->srcpad, stream->buffer_probe_id);
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gst_object_unref (stream->srcpad);
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}
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slot = get_slot_for_input (dbin, stream);
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if (slot) {
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slot->pending_stream = NULL;
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slot->input = NULL;
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GST_DEBUG_OBJECT (dbin, "slot %p cleared", slot);
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}
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dbin->input_streams = g_list_remove (dbin->input_streams, stream);
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g_free (stream);
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}
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static void
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unblock_pending_input (DecodebinInput * input, gboolean unblock_other_inputs)
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{
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GstDecodebin3 *dbin = input->dbin;
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GList *tmp, *unused_slot = NULL;
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GST_DEBUG_OBJECT (dbin,
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"DecodebinInput for %" GST_PTR_FORMAT " , unblock_other_inputs:%d",
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input->parsebin, unblock_other_inputs);
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/* Re-use existing streams if/when possible */
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GST_FIXME_OBJECT (dbin, "Re-use existing input streams if/when possible");
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/* Unblock all input streams and link to a slot if needed */
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SELECTION_LOCK (dbin);
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tmp = dbin->input_streams;
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while (tmp != NULL) {
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DecodebinInputStream *input_stream = (DecodebinInputStream *) tmp->data;
|
|
GList *next = tmp->next;
|
|
MultiQueueSlot *slot;
|
|
|
|
if (input_stream->input != input) {
|
|
tmp = next;
|
|
continue;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (dbin, "Checking input stream %p", input_stream);
|
|
|
|
if (!input_stream->active_stream)
|
|
input_stream->active_stream = gst_pad_get_stream (input_stream->srcpad);
|
|
|
|
/* Ensure the stream has an associated slot */
|
|
slot = get_slot_for_input (dbin, input_stream);
|
|
if (slot->input != input_stream)
|
|
link_input_to_slot (input_stream, slot);
|
|
|
|
if (input_stream->buffer_probe_id) {
|
|
GST_DEBUG_OBJECT (dbin,
|
|
"Removing pad block on input %p pad %" GST_PTR_FORMAT, input_stream,
|
|
input_stream->srcpad);
|
|
gst_pad_remove_probe (input_stream->srcpad,
|
|
input_stream->buffer_probe_id);
|
|
input_stream->buffer_probe_id = 0;
|
|
}
|
|
|
|
if (input_stream->saw_eos) {
|
|
GST_DEBUG_OBJECT (dbin, "Removing EOS'd stream");
|
|
remove_input_stream (dbin, input_stream);
|
|
tmp = dbin->input_streams;
|
|
} else
|
|
tmp = next;
|
|
}
|
|
|
|
/* Weed out unused multiqueue slots */
|
|
for (tmp = dbin->slots; tmp; tmp = tmp->next) {
|
|
MultiQueueSlot *slot = (MultiQueueSlot *) tmp->data;
|
|
GST_LOG_OBJECT (dbin, "Slot %d input:%p", slot->id, slot->input);
|
|
if (slot->input == NULL) {
|
|
unused_slot =
|
|
g_list_append (unused_slot, gst_object_ref (slot->sink_pad));
|
|
}
|
|
}
|
|
SELECTION_UNLOCK (dbin);
|
|
|
|
if (unused_slot) {
|
|
for (tmp = unused_slot; tmp; tmp = tmp->next) {
|
|
GstPad *sink_pad = (GstPad *) tmp->data;
|
|
GST_DEBUG_OBJECT (sink_pad, "Sending EOS to unused slot");
|
|
gst_pad_send_event (sink_pad, gst_event_new_eos ());
|
|
}
|
|
g_list_free_full (unused_slot, (GDestroyNotify) gst_object_unref);
|
|
}
|
|
|
|
if (unblock_other_inputs) {
|
|
GList *tmp;
|
|
/* If requrested, unblock inputs which are targetting the same collection */
|
|
if (dbin->main_input != input) {
|
|
if (dbin->main_input->collection == input->collection) {
|
|
GST_DEBUG_OBJECT (dbin, "Unblock main input");
|
|
unblock_pending_input (dbin->main_input, FALSE);
|
|
}
|
|
}
|
|
for (tmp = dbin->other_inputs; tmp; tmp = tmp->next) {
|
|
DecodebinInput *other = tmp->data;
|
|
if (other->collection == input->collection) {
|
|
GST_DEBUG_OBJECT (dbin, "Unblock other input");
|
|
unblock_pending_input (other, FALSE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
parsebin_pad_added_cb (GstElement * demux, GstPad * pad, DecodebinInput * input)
|
|
{
|
|
GstDecodebin3 *dbin = input->dbin;
|
|
|
|
GST_DEBUG_OBJECT (dbin, "New pad %s:%s (input:%p)", GST_DEBUG_PAD_NAME (pad),
|
|
input);
|
|
|
|
SELECTION_LOCK (dbin);
|
|
create_input_stream (dbin, pad, input);
|
|
SELECTION_UNLOCK (dbin);
|
|
}
|
|
|
|
/* WITH SELECTION_LOCK TAKEN! */
|
|
static DecodebinInputStream *
|
|
find_input_stream_for_pad (GstDecodebin3 * dbin, GstPad * pad)
|
|
{
|
|
GList *tmp;
|
|
|
|
for (tmp = dbin->input_streams; tmp; tmp = tmp->next) {
|
|
DecodebinInputStream *cand = (DecodebinInputStream *) tmp->data;
|
|
if (cand->srcpad == pad)
|
|
return cand;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
parsebin_pad_removed_cb (GstElement * demux, GstPad * pad, DecodebinInput * inp)
|
|
{
|
|
GstDecodebin3 *dbin = inp->dbin;
|
|
DecodebinInputStream *input = NULL;
|
|
MultiQueueSlot *slot;
|
|
|
|
if (!GST_PAD_IS_SRC (pad))
|
|
return;
|
|
|
|
SELECTION_LOCK (dbin);
|
|
|
|
GST_DEBUG_OBJECT (pad, "removed");
|
|
input = find_input_stream_for_pad (dbin, pad);
|
|
|
|
if (input == NULL) {
|
|
GST_DEBUG_OBJECT (pad,
|
|
"Input stream not found, it was cleaned-up earlier after receiving EOS");
|
|
SELECTION_UNLOCK (dbin);
|
|
return;
|
|
}
|
|
|
|
/* If there are no pending pads, this means we will definitely not need this
|
|
* stream anymore */
|
|
|
|
GST_DEBUG_OBJECT (pad, "Remove input stream %p", input);
|
|
|
|
slot = get_slot_for_input (dbin, input);
|
|
remove_input_stream (dbin, input);
|
|
|
|
if (slot && g_list_find (dbin->slots, slot) && slot->is_drained) {
|
|
/* if slot is still there and already drained, remove it in here */
|
|
if (slot->output) {
|
|
DecodebinOutputStream *output = slot->output;
|
|
GST_DEBUG_OBJECT (pad, "Multiqueue was drained, Remove output stream");
|
|
|
|
dbin->output_streams = g_list_remove (dbin->output_streams, output);
|
|
free_output_stream (dbin, output);
|
|
}
|
|
GST_DEBUG_OBJECT (pad, "No pending pad, Remove multiqueue slot");
|
|
if (slot->probe_id)
|
|
gst_pad_remove_probe (slot->src_pad, slot->probe_id);
|
|
slot->probe_id = 0;
|
|
dbin->slots = g_list_remove (dbin->slots, slot);
|
|
free_multiqueue_slot_async (dbin, slot);
|
|
}
|
|
SELECTION_UNLOCK (dbin);
|
|
}
|