Add prelimimary (basic, possibly broken) dvdnav support

This readds a more or less completely new dvdnav implementation, though
it's based on the code from before commit 41fbcee. Note that this is
rather basic, and might be broken or not quite usable in many cases.

Most importantly, navigation highlights are not correctly implemented.
This would require changes in the FFmpeg dvdsub decoder (to apply a
different internal CLUT), so supporting it is not really possible right
now. And in fact, I don't think I ever want to support it, because it's
a very small gain for a lot of work. Instead, mpv will display fake
highlights, which are an approximate bounding box around the real
highlights.

Some things like mouse input or switching audio/subtitles stream using
the dvdnav VM are not supported.

Might be quite fragile on transitions: if dvdnav initiates a transition,
and doesn't give us enough mpeg data to initialize video playback, the
player will just quit.

This is added only because some users seem to want it. I don't intend to
make mpv a good DVD player, so the very basic minimum will have to do.
How about you just convert your DVD to proper video files?

1 files changed, 207 insertions, 0 deletions

diff --git a/mpvcore/player/dvdnav.c b/mpvcore/player/dvdnav.c
new file mode 100644
index 0000000000..879bacd1c1
--- /dev/null
+++ b/mpvcore/player/dvdnav.c
@@ -0,0 +1,207 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv 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.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <limits.h>
+#include <assert.h>
+
+#include "mp_core.h"
+
+#include "mpvcore/mp_msg.h"
+#include "mpvcore/mp_common.h"
+#include "mpvcore/input/input.h"
+
+#include "stream/stream_dvdnav.h"
+
+#include "sub/dec_sub.h"
+#include "sub/osd.h"
+
+#include "video/mp_image.h"
+#include "video/decode/dec_video.h"
+
+struct mp_nav_state {
+    struct mp_log *log;
+
+    bool nav_still_frame;
+    bool nav_eof;
+    bool nav_menu;
+    int hi_visible;
+    int highlight[4]; // x0 y0 x1 y1
+    int subsize[2];
+    struct sub_bitmap *hi_elem;
+};
+
+// Allocate state and enable navigation features. Must happen before
+// initializing cache, because the cache would read data. Since stream_dvdnav is
+// in a mode which skips all transitions on reading data (before enabling
+// data), this would skip stuff.
+void mp_nav_init(struct MPContext *mpctx)
+{
+    assert(!mpctx->nav_state);
+
+    // dvdnav is interactive
+    if (mpctx->encode_lavc_ctx)
+        return;
+
+    struct mp_nav_cmd inp = {MP_NAV_CMD_ENABLE};
+    if (stream_control(mpctx->stream, STREAM_CTRL_NAV_CMD, &inp) < 1)
+        return;
+
+    mpctx->nav_state = talloc_zero(NULL, struct mp_nav_state);
+    mpctx->nav_state->log = mp_log_new(mpctx->nav_state, mpctx->log, "dvdnav");
+
+    MP_VERBOSE(mpctx->nav_state, "enabling\n");
+
+    mp_input_enable_section(mpctx->input, "dvdnav", 0);
+    mp_input_set_section_mouse_area(mpctx->input, "dvdnav-menu",
+                                    INT_MIN, INT_MIN, INT_MAX, INT_MAX);
+}
+
+void mp_nav_reset(struct MPContext *mpctx)
+{
+    struct mp_nav_state *nav = mpctx->nav_state;
+    if (!nav)
+        return;
+    struct mp_nav_cmd inp = {MP_NAV_CMD_RESUME};
+    stream_control(mpctx->stream, STREAM_CTRL_NAV_CMD, &inp);
+    nav->hi_visible = 0;
+    nav->nav_menu = false;
+    mp_input_disable_section(mpctx->input, "dvdnav-menu");
+    // Prevent demuxer init code to seek to the "start"
+    if (mpctx->stream)
+        mpctx->stream->start_pos = stream_tell(mpctx->stream);
+}
+
+void mp_nav_destroy(struct MPContext *mpctx)
+{
+    if (!mpctx->nav_state)
+        return;
+    mp_input_disable_section(mpctx->input, "dvdnav");
+    mp_input_disable_section(mpctx->input, "dvdnav-menu");
+    talloc_free(mpctx->nav_state);
+    mpctx->nav_state = NULL;
+}
+
+void mp_nav_user_input(struct MPContext *mpctx, char *command)
+{
+    struct mp_nav_state *nav = mpctx->nav_state;
+    if (!nav)
+        return;
+    struct mp_nav_cmd inp = {MP_NAV_CMD_MENU};
+    inp.u.menu.action = command;
+    stream_control(mpctx->stream, STREAM_CTRL_NAV_CMD, &inp);
+}
+
+void mp_handle_nav(struct MPContext *mpctx)
+{
+    struct mp_nav_state *nav = mpctx->nav_state;
+    if (!nav)
+        return;
+    while (1) {
+        struct mp_nav_event *ev = NULL;
+        stream_control(mpctx->stream, STREAM_CTRL_GET_NAV_EVENT, &ev);
+        if (!ev)
+            break;
+        switch (ev->event) {
+        case MP_NAV_EVENT_DRAIN: {
+            struct mp_nav_cmd inp = {MP_NAV_CMD_DRAIN_OK};
+            stream_control(mpctx->stream, STREAM_CTRL_NAV_CMD, &inp);
+            MP_VERBOSE(nav, "drain\n");
+            break;
+        }
+        case MP_NAV_EVENT_RESET_ALL: {
+            mpctx->stop_play = PT_RELOAD_DEMUXER;
+            MP_VERBOSE(nav, "reload\n");
+            break;
+        }
+        case MP_NAV_EVENT_EOF:
+            nav->nav_eof = true;
+            break;
+        case MP_NAV_EVENT_MENU_MODE:
+            nav->nav_menu = ev->u.menu_mode.enable;
+            if (nav->nav_menu) {
+                mp_input_enable_section(mpctx->input, "dvdnav-menu", 0);
+            } else {
+                mp_input_disable_section(mpctx->input, "dvdnav-menu");
+            }
+            break;
+        case MP_NAV_EVENT_HIGHLIGHT:
+            MP_VERBOSE(nav, "highlight: %d %d %d - %d %d\n",
+                       ev->u.highlight.display,
+                       ev->u.highlight.sx, ev->u.highlight.sy,
+                       ev->u.highlight.ex, ev->u.highlight.ey);
+            nav->highlight[0] = MPCLAMP(ev->u.highlight.sx, 0, 720);
+            nav->highlight[1] = MPCLAMP(ev->u.highlight.sy, 0, 480);
+            nav->highlight[2] = MPCLAMP(ev->u.highlight.ex, 0, 720);
+            nav->highlight[3] = MPCLAMP(ev->u.highlight.ey, 0, 480);
+            nav->hi_visible = ev->u.highlight.display;
+            mpctx->osd->highlight_priv = mpctx;
+            osd_changed(mpctx->osd, OSDTYPE_NAV_HIGHLIGHT);
+            break;
+        default: ; // ignore
+        }
+        talloc_free(ev);
+    }
+    // E.g. keep displaying still frames
+    if (mpctx->stop_play == AT_END_OF_FILE && !nav->nav_eof)
+        mpctx->stop_play = KEEP_PLAYING;
+}
+
+// Render "fake" highlights, because using actual dvd sub highlight elements
+// is too hard, and would require extra libavcodec to begin with.
+// Note: a proper solution would introduce something like
+//       SD_CTRL_APPLY_DVDNAV, which would crop the vobsub frame,
+//       and apply the current CLUT.
+void mp_nav_get_highlight(struct osd_state *osd, struct mp_osd_res res,
+                          struct sub_bitmaps *out_imgs)
+{
+    struct MPContext *mpctx = osd->highlight_priv;
+    struct mp_nav_state *nav = mpctx ? mpctx->nav_state : NULL;
+    if (!nav)
+        return;
+    struct sub_bitmap *sub = nav->hi_elem;
+    if (!sub)
+        sub = talloc_zero(nav, struct sub_bitmap);
+
+    nav->hi_elem = sub;
+    int sizes[2] = {0};
+    if (mpctx->d_sub)
+        sub_control(mpctx->d_sub, SD_CTRL_GET_RESOLUTION, sizes);
+    if (sizes[0] < 1 || sizes[1] < 1) {
+        struct mp_image_params vid = {0};
+        if (mpctx->d_video)
+            vid = mpctx->d_video->decoder_output;
+        sizes[0] = vid.w;
+        sizes[1] = vid.h;
+    }
+    if (sizes[0] < 1 || sizes[1] < 1)
+        return;
+    if (sizes[0] != nav->subsize[0] || sizes[1] != nav->subsize[1]) {
+        talloc_free(sub->bitmap);
+        sub->bitmap = talloc_array(sub, uint32_t, sizes[0] * sizes[1]);
+        memset(sub->bitmap, 0x80, talloc_get_size(sub->bitmap));
+    }
+
+    sub->x = nav->highlight[0];
+    sub->y = nav->highlight[1];
+    sub->w = MPMAX(nav->highlight[2] - sub->x, 0);
+    sub->h = MPMAX(nav->highlight[3] - sub->y, 0);
+    sub->stride = sub->w;
+    out_imgs->format = SUBBITMAP_RGBA;
+    out_imgs->parts = sub;
+    out_imgs->num_parts = sub->w > 0 && sub->h > 0 && nav->hi_visible;
+    osd_rescale_bitmaps(out_imgs, sizes[0], sizes[1], res, -1);
+}