From 10befc8e6ed2129143af79cfcfbc0fd5a4fe3d85 Mon Sep 17 00:00:00 2001
From: Steve Bavin <pondlife@pondlife.me>
Date: Sun, 15 Oct 2006 11:03:26 +0000
Subject: [PATCH] Don't unboost CPU in an ISR

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11224 a1c6a512-1295-4272-9138-f99709370657
---
 apps/pcmbuf.c   | 21 ++++++++++++---------
 apps/pcmbuf.h   |  1 +
 apps/playback.c | 14 ++++++--------
 3 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/apps/pcmbuf.c b/apps/pcmbuf.c
index 964ebbc901..d8612a4fbc 100644
--- a/apps/pcmbuf.c
+++ b/apps/pcmbuf.c
@@ -94,6 +94,7 @@ static size_t pcmbuf_mix_sample IDATA_ATTR;
 
 static bool low_latency_mode = false;
 static bool pcmbuf_flush;
+static volatile bool output_completed = false;
 
 extern struct thread_entry *codec_thread_p;
 
@@ -115,7 +116,7 @@ void pcmbuf_boost(bool state)
 #ifdef HAVE_PRIORITY_SCHEDULING
     static bool priority_modified = false;
 #endif
-    
+
     if (crossfade_init || crossfade_active)
         return;
 
@@ -203,14 +204,7 @@ process_new_buffer:
             *realsize = 0;
             *realstart = NULL;
             CALL_IF_EXISTS(pcmbuf_event_handler);
-            /* FIXME: We need to find another way to keep the CPU from
-             * being left boosted, because this is boosting in interrupt
-             * context.  This is also not a good thing, because it will
-             * result in the CPU being deboosted if there is a legitimate
-             * buffer underrun (albeit only temporarily, because someone
-             * will reboost it soon, but it will make the skip longer
-             * than necessary. */
-            pcmbuf_boost(false);
+            output_completed = true;
         }
     }
 }
@@ -1037,3 +1031,12 @@ bool pcmbuf_is_crossfade_enabled(void)
     return crossfade_enabled;
 }
 
+bool pcmbuf_output_completed(void)
+{
+    if (output_completed)
+    {
+        output_completed = false;
+        return true;
+    }
+    return false;
+}
diff --git a/apps/pcmbuf.h b/apps/pcmbuf.h
index b5035f4405..2106968368 100644
--- a/apps/pcmbuf.h
+++ b/apps/pcmbuf.h
@@ -46,6 +46,7 @@ size_t get_pcmbuf_descsize(void);
 void pcmbuf_pause(bool pause);
 void pcmbuf_play_stop(void);
 bool pcmbuf_is_crossfade_active(void);
+bool pcmbuf_output_completed(void);
 
 /* These functions are for playing chained buffers of PCM data */
 #if defined(HAVE_ADJUSTABLE_CPU_FREQ) && !defined(SIMULATOR)
diff --git a/apps/playback.c b/apps/playback.c
index 8c480c46c7..44aa8696fc 100644
--- a/apps/playback.c
+++ b/apps/playback.c
@@ -203,7 +203,7 @@ static unsigned char *iram_buf[2];
 static unsigned char *dram_buf[2];
 
 /* Step count to the next unbuffered track. */
-static int last_peek_offset;
+static int last_peek_offset;                    /* Audio thread */
 
 /* Track information (count in file buffer, read/write indexes for
    track ring structure. */
@@ -674,7 +674,7 @@ void audio_preinit(void)
     track_buffer_callback = NULL;
     track_unbuffer_callback = NULL;
     track_changed_callback = NULL;
-    /* Just to prevent CUR_TI never be anything random. */
+    /* Just to prevent CUR_TI from being anything random. */
     track_ridx = 0;
 
     mutex_init(&mutex_codecthread);
@@ -1249,7 +1249,6 @@ static void codec_set_offset_callback(size_t value)
 static void codec_advance_buffer_counters(size_t amount) 
 {
     buf_ridx = RINGBUF_ADD(buf_ridx, amount);
-    
     ci.curpos += amount;
     CUR_TI->available -= amount;
 
@@ -1963,12 +1962,11 @@ static bool audio_buffer_wind_forward(int new_track_ridx, int old_track_ridx)
     amount = tracks[old_track_ridx].filesize - ci.curpos;
     /* Then collect all data from tracks in between them */
     amount += audio_buffer_count_tracks(old_track_ridx, new_track_ridx);
+    logf("bwf:%ldB", (long) amount);
     
     if (amount > FILEBUFUSED)
         return false;
 
-    logf("bwf:%ldB",amount);
-
     /* Wind the buffer to the beginning of the target track or its codec */
     buf_ridx = RINGBUF_ADD(buf_ridx, amount);
     
@@ -2535,7 +2533,6 @@ static bool audio_load_track(int offset, bool start_play, bool rebuffer)
             tracks[track_widx].id3.offset = offset;
             break;
         }
-
     }
     
     logf("alt:%s", trackname);
@@ -2891,9 +2888,8 @@ static void audio_rebuffer_and_seek(size_t newpos)
     int fd;
     char *trackname;
 
-    trackname = playlist_peek(0);
     /* (Re-)open current track's file handle. */
-
+    trackname = playlist_peek(0);
     fd = open(trackname, O_RDONLY);
     if (fd < 0) 
     {
@@ -3342,6 +3338,8 @@ static void audio_thread(void)
 
             case SYS_TIMEOUT:
                 LOGFQUEUE("audio < SYS_TIMEOUT");
+                if (pcmbuf_output_completed())
+                    pcmbuf_play_stop(); /* Stop to ensure unboosted */
                 break;
 
             default: