1 files changed, 104 insertions, 0 deletions
diff --git a/video/out/vo_null.c b/video/out/vo_null.c
new file mode 100644
index 0000000..0c49062
--- /dev/null
+++ b/video/out/vo_null.c
@@ -0,0 +1,104 @@
+/*
+ * based on video_out_null.c from mpeg2dec
+ *
+ * Copyright (C) Aaron Holtzman - June 2000
+ *
+ * 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 <stdlib.h>
+#include "common/msg.h"
+#include "vo.h"
+#include "video/mp_image.h"
+#include "osdep/timer.h"
+#include "options/m_option.h"
+
+struct priv {
+    int64_t last_vsync;
+
+    double cfg_fps;
+};
+
+static void draw_frame(struct vo *vo, struct vo_frame *frame)
+{
+}
+
+static void flip_page(struct vo *vo)
+{
+    struct priv *p = vo->priv;
+    if (p->cfg_fps) {
+        int64_t ft = 1e9 / p->cfg_fps;
+        int64_t prev_vsync = mp_time_ns() / ft;
+        int64_t target_time = (prev_vsync + 1) * ft;
+        for (;;) {
+            int64_t now = mp_time_ns();
+            if (now >= target_time)
+                break;
+            mp_sleep_ns(target_time - now);
+        }
+    }
+}
+
+static int query_format(struct vo *vo, int format)
+{
+    return 1;
+}
+
+static int reconfig(struct vo *vo, struct mp_image_params *params)
+{
+    return 0;
+}
+
+static void uninit(struct vo *vo)
+{
+}
+
+static int preinit(struct vo *vo)
+{
+    return 0;
+}
+
+static int control(struct vo *vo, uint32_t request, void *data)
+{
+    struct priv *p = vo->priv;
+    switch (request) {
+    case VOCTRL_GET_DISPLAY_FPS:
+        if (!p->cfg_fps)
+            break;
+        *(double *)data = p->cfg_fps;
+        return VO_TRUE;
+    }
+    return VO_NOTIMPL;
+}
+
+#define OPT_BASE_STRUCT struct priv
+const struct vo_driver video_out_null = {
+    .description = "Null video output",
+    .name = "null",
+    .preinit = preinit,
+    .query_format = query_format,
+    .reconfig = reconfig,
+    .control = control,
+    .draw_frame = draw_frame,
+    .flip_page = flip_page,
+    .uninit = uninit,
+    .priv_size = sizeof(struct priv),
+    .options = (const struct m_option[]) {
+        {"fps", OPT_DOUBLE(cfg_fps), M_RANGE(0, 10000)},
+        {0},
+    },
+    .options_prefix = "vo-null",
+};