From 3b76544fa9441976b612d0933cc5149c96290eb0 Mon Sep 17 00:00:00 2001
From: Brandon Low <lostlogic@rockbox.org>
Date: Tue, 11 Apr 2006 12:29:46 +0000
Subject: Ensure that codecs are cleared from the buffer if they will not be
 needed by the track about to play and some minor changes for correctness with
 no functional difference

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9605 a1c6a512-1295-4272-9138-f99709370657
---
 apps/playback.c | 49 ++++++++++++++++++++++++-------------------------
 1 file changed, 24 insertions(+), 25 deletions(-)

diff --git a/apps/playback.c b/apps/playback.c
index 19e997b17b..0f4a8824ee 100644
--- a/apps/playback.c
+++ b/apps/playback.c
@@ -648,12 +648,8 @@ static void buffer_wind_forward(void)
         buf_ridx -= filebuflen;
 }
 
-static void buffer_wind_backward(bool need_codec)
+static void buffer_wind_backward(size_t rewind)
 {
-    /* Rewind the buffer to the beginning of the new track */
-    size_t rewind = ci.curpos + prev_ti->codecsize + cur_ti->filesize;
-    if (need_codec)
-        rewind += cur_ti->codecsize;
     /* Check and handle buffer wrapping */
     if (rewind > buf_ridx)
         buf_ridx += filebuflen;
@@ -731,8 +727,7 @@ static void audio_check_new_track(long direction)
         {
             /* This is how much 'back' data must remain uncleared for us
              * to safely backup to the beginning of the previous track */
-            size_t req_size =
-                ci.curpos + prev_ti->codecsize + tracks[track_ridx].filesize;
+            size_t req_size = ci.curpos + prev_ti->codecsize + cur_ti->filesize;
             /* This is the amount of 'back' data available on the buffer */
             size_t buf_back = buf_ridx;
             if (buf_back < buf_widx)
@@ -759,12 +754,12 @@ static void audio_check_new_track(long direction)
                     else
                     {
                         cur_ti->has_codec = true;
-                        buffer_wind_backward(true);
+                        buffer_wind_backward(req_size);
                     }
                 }
             }
             else
-                buffer_wind_backward(false);
+                buffer_wind_backward(req_size);
         }
     }
     mutex_unlock(&mutex_interthread);
@@ -1117,11 +1112,13 @@ static void audio_read_file(void)
 
 static void codec_discard_codec_callback(void)
 {
-    tracks[track_ridx].has_codec = false;
-    filebufused -= tracks[track_ridx].codecsize;
-    buf_ridx += tracks[track_ridx].codecsize;
-    if (buf_ridx >= filebuflen)
-        buf_ridx -= filebuflen;
+    if (tracks[track_ridx].has_codec) {
+        tracks[track_ridx].has_codec = false;
+        filebufused -= tracks[track_ridx].codecsize;
+        buf_ridx += tracks[track_ridx].codecsize;
+        if (buf_ridx >= filebuflen)
+            buf_ridx -= filebuflen;
+    }
 }
 
 static bool loadcodec(bool start_play)
@@ -1747,19 +1744,20 @@ bool codec_request_next_track_callback(void)
     }
     
     /* Check if the next codec is the same file. */
-    if (get_codec_base_type(prev_ti->id3.codectype) !=
+    if (get_codec_base_type(prev_ti->id3.codectype) ==
         get_codec_base_type(cur_ti->id3.codectype))
-    {
-        logf("New codec:%d/%d", cur_ti->id3.codectype, prev_ti->id3.codectype);
-        ci.reload_codec = true;
-        return false;
-    }
-    else
     {
         logf("New track loaded");
         ci.reload_codec = false;
+        codec_discard_codec_callback();
         return true;
     }
+    else
+    {
+        logf("New codec:%d/%d", cur_ti->id3.codectype, prev_ti->id3.codectype);
+        ci.reload_codec = true;
+        return false;
+    }
 }
 
 /* Invalidates all but currently playing track. */
@@ -1979,7 +1977,7 @@ void codec_thread(void)
 
             case Q_CODEC_LOAD:
                 logf("Codec start");
-                if (!cur_ti->has_codec) {
+                if (!tracks[track_ridx].has_codec) {
                     logf("Codec slot is empty!");
                     /* Wait for the pcm buffer to go empty */
                     while (pcm_is_playing())
@@ -1991,12 +1989,13 @@ void codec_thread(void)
                 }
 
                 ci.stop_codec = false;
-                wrap = (size_t)&filebuf[filebuflen] - (size_t)cur_ti->codecbuf;
+                wrap = (size_t)&filebuf[filebuflen] -
+                    (size_t)tracks[track_ridx].codecbuf;
                 audio_codec_loaded = true;
                 mutex_lock(&mutex_codecthread);
                 current_codec = CODEC_IDX_AUDIO;
-                status = codec_load_ram(cur_ti->codecbuf, cur_ti->codecsize,
-                                        &filebuf[0], wrap, &ci);
+                status = codec_load_ram(tracks[track_ridx].codecbuf,
+                        tracks[track_ridx].codecsize, &filebuf[0], wrap, &ci);
                 mutex_unlock(&mutex_codecthread);
                 break ;
 
-- 
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