vo: add mediacodec_embed output driver

Allows rendering IMGFMT_MEDIACODEC frames directly onto an
android.view.Surface

DOCS/man/vo.rst

@@ -504,3 +504,11 @@ Available video output drivers are:
         Mode ID to use (resolution, bit depth and frame rate).
         (default: 0)
 
+``mediacodec_embed`` (Android)
+    Renders ``IMGFMT_MEDIACODEC`` frames directly to an ``android.view.Surface``.
+    Requires ``--hwdec=mediacodec`` for hardware decoding, along with
+    ``--vo=mediacodec_embed`` and ``--wid=(intptr_t)(*android.view.Surface)``.
+
+    Since this video output driver uses native decoding and rendering routines,
+    many of mpv's features (subtitle rendering, OSD/OSC, video filters, etc)
+    are not available with this driver.

video/out/vo.c

@@ -47,6 +47,7 @@
 #include "osdep/io.h"
 #include "osdep/threads.h"
 
+extern const struct vo_driver video_out_android;
 extern const struct vo_driver video_out_x11;
 extern const struct vo_driver video_out_vdpau;
 extern const struct vo_driver video_out_xv;
@@ -66,6 +67,9 @@ extern const struct vo_driver video_out_tct;
 
 const struct vo_driver *const video_out_drivers[] =
 {
+#if HAVE_ANDROID
+    &video_out_android,
+#endif
 #if HAVE_RPI
     &video_out_rpi,
 #endif

video/out/vo_mediacodec_embed.c

@@ -0,0 +1,89 @@
+/*
+ * 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 <libavcodec/mediacodec.h>
+
+#include "common/common.h"
+#include "vo.h"
+#include "video/mp_image.h"
+
+struct priv {
+    struct mp_image *next_image;
+};
+
+static int preinit(struct vo *vo)
+{
+    return 0;
+}
+
+static void flip_page(struct vo *vo)
+{
+    struct priv *p = vo->priv;
+    if (!p->next_image)
+        return;
+
+    AVMediaCodecBuffer *buffer = (AVMediaCodecBuffer *)p->next_image->planes[3];
+    av_mediacodec_release_buffer(buffer, 1);
+    mp_image_unrefp(&p->next_image);
+}
+
+static void draw_frame(struct vo *vo, struct vo_frame *frame)
+{
+    struct priv *p = vo->priv;
+
+    mp_image_t *mpi = NULL;
+    if (!frame->redraw && !frame->repeat)
+        mpi = mp_image_new_ref(frame->current);
+
+    talloc_free(p->next_image);
+    p->next_image = mpi;
+}
+
+static int query_format(struct vo *vo, int format)
+{
+    return format == IMGFMT_MEDIACODEC;
+}
+
+static int control(struct vo *vo, uint32_t request, void *data)
+{
+    return VO_NOTIMPL;
+}
+
+static int reconfig(struct vo *vo, struct mp_image_params *params)
+{
+    return 0;
+}
+
+static void uninit(struct vo *vo)
+{
+    struct priv *p = vo->priv;
+    mp_image_unrefp(&p->next_image);
+}
+
+const struct vo_driver video_out_mediacodec_embed = {
+    .description = "Android (Embedded MediaCodec Surface)",
+    .name = "mediacodec_embed",
+    .caps = VO_CAP_NOREDRAW,
+    .preinit = preinit,
+    .query_format = query_format,
+    .control = control,
+    .draw_frame = draw_frame,
+    .flip_page = flip_page,
+    .reconfig = reconfig,
+    .uninit = uninit,
+    .priv_size = sizeof(struct priv),
+};

wscript_build.py

@@ -446,6 +446,7 @@ def build(ctx):
         ( "video/out/opengl/hwdec_vaglx.c",      "vaapi-glx" ),
         ( "video/out/opengl/hwdec_vdpau.c",      "vdpau-gl-x11" ),
         ( "video/out/vo.c" ),
+        ( "video/out/vo_mediacodec_embed.c",     "android" ),
         ( "video/out/vo_caca.c",                 "caca" ),
         ( "video/out/vo_drm.c",                  "drm" ),
         ( "video/out/vo_direct3d.c",             "direct3d" ),