From b4f24544bbfdd2bec765db08f5d745fadeb4d111 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Thu, 31 Jul 2014 04:19:41 +0200
Subject: client API: make "cache" property and similar observable

Achieve this by polling. Will be used by the OSC. Basically a bad hack -
but the point is that the mpv core itself is in the best position to
improve this later.
---
 libmpv/client.h   |  1 +
 player/command.c  |  1 +
 player/command.h  |  3 +++
 player/core.h     |  1 +
 player/playloop.c | 12 ++++++++++++
 5 files changed, 18 insertions(+)

diff --git a/libmpv/client.h b/libmpv/client.h
index 9abba6434b..69bc77c0ac 100644
--- a/libmpv/client.h
+++ b/libmpv/client.h
@@ -983,6 +983,7 @@ typedef enum mpv_event_id {
      * Happens when the current chapter changes.
      */
     MPV_EVENT_CHAPTER_CHANGE = 23
+    // Internal note: adjust INTERNAL_EVENT_BASE when adding new events.
 } mpv_event_id;
 
 /**
diff --git a/player/command.c b/player/command.c
index eedbc0bbc7..27fcadcb29 100644
--- a/player/command.c
+++ b/player/command.c
@@ -2792,6 +2792,7 @@ static const char *const *const mp_event_property_change[] = {
       "samplerate", "channels", "audio"),
     E(MPV_EVENT_METADATA_UPDATE, "metadata"),
     E(MPV_EVENT_CHAPTER_CHANGE, "chapter", "chapter-metadata"),
+    E(MP_EVENT_CACHE_UPDATE, "cache", "cache-free", "cache-used"),
 };
 #undef E
 
diff --git a/player/command.h b/player/command.h
index 846067b3bf..c9a07ff733 100644
--- a/player/command.h
+++ b/player/command.h
@@ -39,4 +39,7 @@ int mp_find_property_index(const char *property);
 void mp_notify(struct MPContext *mpctx, int event, void *arg);
 void mp_notify_property(struct MPContext *mpctx, const char *property);
 
+#define INTERNAL_EVENT_BASE 24
+#define MP_EVENT_CACHE_UPDATE (INTERNAL_EVENT_BASE + 0)
+
 #endif /* MPLAYER_COMMAND_H */
diff --git a/player/core.h b/player/core.h
index 6b3cf55f8b..dd5d975038 100644
--- a/player/core.h
+++ b/player/core.h
@@ -306,6 +306,7 @@ typedef struct MPContext {
 
     double next_heartbeat;
     double last_idle_tick;
+    double next_cache_update;
 
     double sleeptime;      // number of seconds to sleep before next iteration
 
diff --git a/player/playloop.c b/player/playloop.c
index 90d46cc178..b1d3efeecf 100644
--- a/player/playloop.c
+++ b/player/playloop.c
@@ -541,6 +541,18 @@ static void handle_pause_on_low_cache(struct MPContext *mpctx)
             opts->pause = prev_paused_user;
         }
     }
+    // Also update cache properties.
+    if (cache_kb > 0 || mpctx->next_cache_update > 0) {
+        double now = mp_time_sec();
+        if (mpctx->next_cache_update <= now) {
+            mpctx->next_cache_update = cache_kb > 0 ? now + 0.25 : 0;
+            mp_notify(mpctx, MP_EVENT_CACHE_UPDATE, NULL);
+        }
+        if (mpctx->next_cache_update > 0) {
+            mpctx->sleeptime =
+                MPMIN(mpctx->sleeptime, mpctx->next_cache_update - now);
+        }
+    }
 }
 
 static void handle_heartbeat_cmd(struct MPContext *mpctx)
-- 
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