demux: add null demuxer

It's useless, but can be used for fancy --lavfi-complex nonsense.

2 files changed, 36 insertions, 0 deletions

diff --git a/demux/demux.c b/demux/demux.c
index 05a8551608..bd3211a74a 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -53,6 +53,7 @@ extern const demuxer_desc_t demuxer_desc_playlist;
 extern const demuxer_desc_t demuxer_desc_disc;
 extern const demuxer_desc_t demuxer_desc_rar;
 extern const demuxer_desc_t demuxer_desc_libarchive;
+extern const demuxer_desc_t demuxer_desc_null;
 extern const demuxer_desc_t demuxer_desc_timeline;
 
 /* Please do not add any new demuxers here. If you want to implement a new
@@ -76,6 +77,7 @@ const demuxer_desc_t *const demuxer_list[] = {
     &demuxer_desc_lavf,
     &demuxer_desc_mf,
     &demuxer_desc_playlist,
+    &demuxer_desc_null,
     NULL
 };
 
diff --git a/demux/demux_null.c b/demux/demux_null.c
new file mode 100644
index 0000000000..c6a25b5af2
--- /dev/null
+++ b/demux/demux_null.c
@@ -0,0 +1,34 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "misc/bstr.h"
+#include "stream/stream.h"
+#include "demux.h"
+
+static int try_open_file(struct demuxer *demux, enum demux_check check)
+{
+    if (strcmp(demux->stream->info->name, "null") != 0 &&
+        check != DEMUX_CHECK_REQUEST)
+        return -1;
+    return 0;
+}
+
+const struct demuxer_desc demuxer_desc_null = {
+    .name = "null",
+    .desc = "null demuxer",
+    .open = try_open_file,
+};