video: don't block when reading video packets

Instead of blocking on the demuxer when reading a packet, let packets be
read asynchronously. Basically, it polls whether a packet is available,
and if not, the playloop goes to sleep until the demuxer thread wakes it
up.

Note that the player will still block for I/O, because audio is still
read synchronously. It's much harder to do the same change for audio
(because of the design of the audio decoding path and especially
initialization), so audio will have to be done later.

1 files changed, 6 insertions, 3 deletions

diff --git a/player/playloop.c b/player/playloop.c
index 2392fd32a4..a3fcf133e3 100644
--- a/player/playloop.c
+++ b/player/playloop.c
@@ -985,6 +985,12 @@ void run_playloop(struct MPContext *mpctx)
 
         video_left = r > 0;
 
+        if (r == 3)
+            break;
+
+        if (mpctx->restart_playback)
+            mpctx->sleeptime = 0;
+
         if (r == 2)
             MP_TRACE(mpctx, "frametime=%5.3f\n", frame_time);
 
@@ -1243,9 +1249,6 @@ void run_playloop(struct MPContext *mpctx)
     if (mpctx->stop_play)
         mpctx->sleeptime = 0;
 
-    if (mpctx->restart_playback)
-        mpctx->sleeptime = 0;
-
     if (mpctx->sleeptime > 0 && handle_osd_redraw(mpctx))
         mpctx->sleeptime = 0;