core: add infrastructure to get screenshots from VOs

Add a VO command (VOCTRL_SCREENSHOT) which requests a screenshot
directly from the VO. If VO support is available, screenshots will be
taken instantly (no more 1 or 2 frames delay). Taking screenshots when
hardware decoding is in use will also work (vdpau). Additionally, the
screenshots will now use the same colorspace as the video display.
Change the central MPContext to be allocated with talloc so that it
can be used as a talloc parent context.

This commit does not yet implement the functionality for any VO (added
in subsequent commits).

The old screenshot video filter is not needed anymore if VO support is
present, and in that case will not be used even if it is present in
the filter chain. If VO support is not available then the filter is
used like before. Note that the filter still has some of the old
problems, such as delaying the screenshot by at least 1 frame.

1 files changed, 39 insertions, 0 deletions

diff --git a/screenshot.h b/screenshot.h
new file mode 100644
index 0000000000..207d58e003
--- /dev/null
+++ b/screenshot.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of mplayer2.
+ *
+ * mplayer2 is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mplayer2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mplayer2; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPLAYER_SCREENSHOT_H
+#define MPLAYER_SCREENSHOT_H
+
+#include <stdbool.h>
+
+struct MPContext;
+struct mp_image;
+
+// Request a taking & saving a screenshot of the currently displayed frame.
+// If each_frame is set, this toggles per-frame screenshots, exactly like the
+// screenshot slave command (MP_CMD_SCREENSHOT).
+void screenshot_request(struct MPContext *mpctx, bool each_frame);
+
+// Save the screenshot contained in the image to disk.
+// The image can be in any format supported by libswscale.
+void screenshot_save(struct MPContext *mpctx, struct mp_image *image);
+
+// Called by the playback core code when a new frame is displayed.
+void screenshot_flip(struct MPContext *mpctx);
+
+#endif /* MPLAYER_SCREENSHOT_H */