From b425de71df7acdc82b4e466a5bac709d0dc15f64 Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Tue, 6 Mar 2007 20:32:13 +0000
Subject: Fix problem with recording screen creep and bag a bigfoot. Voice
 clips aren't long enough now to untrigger the thread boost that was supposed
 to be applied to the codec thread. The voice thread was needlessly boosting
 the codec thread and leaving it boosted which explains the encoders' ability
 to flood the output buffer when everything else was stopped in its tracks.
 Check which thread is calling pcmbuf_under_watermark and only initiate the
 boost when it's the codec thread. Always return the codec thread to its usual
 priority in pcmbuf_play_stop.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12649 a1c6a512-1295-4272-9138-f99709370657
---
 apps/pcmbuf.c | 50 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 18 deletions(-)

(limited to 'apps')

diff --git a/apps/pcmbuf.c b/apps/pcmbuf.c
index e2b1d7f87b..91b9f1329b 100644
--- a/apps/pcmbuf.c
+++ b/apps/pcmbuf.c
@@ -104,6 +104,8 @@ static size_t pcmbuf_mix_sample IDATA_ATTR;
 static bool low_latency_mode = false;
 static bool pcmbuf_flush;
 
+static int codec_thread_priority = 0;
+
 extern struct thread_entry *codec_thread_p;
 
 /* Helpful macros for use in conditionals this assumes some of the above
@@ -235,30 +237,37 @@ static inline void pcmbuf_add_chunk(void)
     audiobuffer_fillpos = 0;
 }
 
-static void pcmbuf_under_watermark(void)
-{
 #ifdef HAVE_PRIORITY_SCHEDULING
-    static int old_priority = 0;
-    
-    if (LOW_DATA(2) && pcm_is_playing())
+static void boost_codec_thread(bool boost)
+{
+    if (boost)
     {
-        if (!old_priority)
-        {
-            /* Buffer is critically low so override UI priority. */
-            old_priority = thread_set_priority(codec_thread_p, 
-                                               PRIORITY_REALTIME);
-        }
+        if (codec_thread_priority == 0)
+            codec_thread_priority = thread_set_priority(
+                codec_thread_p, PRIORITY_REALTIME);
     }
-    else if (old_priority)
+    else if (codec_thread_priority != 0)
     {
-        /* Set back the original priority. */
-        thread_set_priority(codec_thread_p, old_priority);
-        old_priority = 0;
+        thread_set_priority(codec_thread_p, codec_thread_priority);
+        codec_thread_priority = 0;
     }
-#endif
+}
+#endif /* HAVE_PRIORITY_SCHEDULING */
 
-    /* Fill audio buffer by boosting cpu */
-    trigger_cpu_boost();
+static void pcmbuf_under_watermark(void)
+{
+    /* Only codec thread initiates boost - voice boosts the cpu when playing
+       a clip */
+    if (thread_get_current() == codec_thread_p)
+    {
+#ifdef HAVE_PRIORITY_SCHEDULING
+        /* If buffer is critically low, override UI priority, else
+           set back to the original priority. */
+        boost_codec_thread(LOW_DATA(2) && pcm_is_playing());
+#endif
+        /* Fill audio buffer by boosting cpu */
+        trigger_cpu_boost();
+    }
 
     /* Disable crossfade if < .5s of audio */
     if (LOW_DATA(2))
@@ -364,6 +373,11 @@ void pcmbuf_play_stop(void)
     crossfade_init = false;
     crossfade_active = false;
     pcmbuf_flush = false;
+
+#ifdef HAVE_PRIORITY_SCHEDULING
+    /* Can unboost the codec thread here no matter who's calling */
+    boost_codec_thread(false);
+#endif
 }
 
 int pcmbuf_used_descs(void) {
-- 
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