command: add drop_buffers

This command was actually requested on IRC ages ago, but I forgot about
it.

The main purpose is that the decoding state can be reset without issuing
a seek, in particular in situations where you can't seek.

This restarts decoding from the middle of the packet stream; since it
discards the packet buffer intentionally, and the decoder will typically
not output "incomplete" frames until it has recovered, it can skip a
large amount of data.

It doesn't clear the byte stream cache - I'm not sure if it should.

1 files changed, 10 insertions, 0 deletions

diff --git a/player/command.c b/player/command.c
index 0559221322..d9a0d99745 100644
--- a/player/command.c
+++ b/player/command.c
@@ -4440,6 +4440,16 @@ int run_command(MPContext *mpctx, mp_cmd_t *cmd)
         return r > 0;
     }
 
+    case MP_CMD_DROP_BUFFERS: {
+        reset_audio_state(mpctx);
+        reset_video_state(mpctx);
+
+        if (mpctx->demuxer)
+            demux_flush(mpctx->demuxer);
+
+        break;
+    }
+
     case MP_CMD_VO_CMDLINE:
         if (mpctx->video_out) {
             char *s = cmd->args[0].v.s;