1 files changed, 83 insertions, 0 deletions
diff --git a/source/blender/sequencer/intern/channels.c b/source/blender/sequencer/intern/channels.c
new file mode 100644
index 00000000000..e8e82af03f5
--- /dev/null
+++ b/source/blender/sequencer/intern/channels.c
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2022 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup sequencer
+ */
+
+#include <string.h>
+
+#include "MEM_guardedalloc.h"
+
+#include "DNA_listBase.h"
+#include "DNA_scene_types.h"
+#include "DNA_sequence_types.h"
+
+#include "BLI_blenlib.h"
+
+#include "SEQ_channels.h"
+#include "SEQ_iterator.h"
+#include "SEQ_relations.h"
+#include "SEQ_sequencer.h"
+
+ListBase *SEQ_channels_displayed_get(Editing *ed)
+{
+  return ed->displayed_channels;
+}
+
+void SEQ_channels_displayed_set(Editing *ed, ListBase *channels)
+{
+  ed->displayed_channels = channels;
+}
+
+void SEQ_channels_ensure(ListBase *channels)
+{
+  /* Allocate channels. Channel 0 is never used, but allocated to prevent off by 1 issues. */
+  for (int i = 0; i < MAXSEQ + 1; i++) {
+    SeqTimelineChannel *channel = MEM_callocN(sizeof(SeqTimelineChannel), "seq timeline channel");
+    BLI_snprintf(channel->name, sizeof(channel->name), "Channel %d", i);
+    channel->index = i;
+    BLI_addtail(channels, channel);
+  }
+}
+
+void SEQ_channels_duplicate(ListBase *channels_dst, ListBase *channels_src)
+{
+  LISTBASE_FOREACH (SeqTimelineChannel *, channel, channels_src) {
+    SeqTimelineChannel *channel_duplicate = MEM_dupallocN(channel);
+    BLI_addtail(channels_dst, channel_duplicate);
+  }
+}
+
+void SEQ_channels_free(ListBase *channels)
+{
+  LISTBASE_FOREACH_MUTABLE (SeqTimelineChannel *, channel, channels) {
+    MEM_freeN(channel);
+  }
+}
+
+SeqTimelineChannel *SEQ_channel_get_by_index(const ListBase *channels, const int channel_index)
+{
+  return BLI_findlink(channels, channel_index);
+}
+
+char *SEQ_channel_name_get(ListBase *channels, const int channel_index)
+{
+  SeqTimelineChannel *channel = SEQ_channel_get_by_index(channels, channel_index);
+  return channel->name;
+}
+
+int SEQ_channel_index_get(const SeqTimelineChannel *channel)
+{
+  return channel->index;
+}
+
+bool SEQ_channel_is_locked(const SeqTimelineChannel *channel)
+{
+  return (channel->flag & SEQ_CHANNEL_LOCK) != 0;
+}
+
+bool SEQ_channel_is_muted(const SeqTimelineChannel *channel)
+{
+  return (channel->flag & SEQ_CHANNEL_MUTE) != 0;
+}