From 1df1e7b0c7f1932f45cfb189b43e873db1a85410 Mon Sep 17 00:00:00 2001
From: Brandon Low <lostlogic@rockbox.org>
Date: Mon, 5 Nov 2007 16:02:12 +0000
Subject: Remove unused conf_preseek from buffering.c and all of its
 accountraments.  This is _not_ a setting.  This is a guessing tool used by
 either playback or buffering to serve its clients better.  Use the
 REBUFFER_GUESS size in resume to help obviate pondlife's bug.  This will also
 need to be used when FS8092 gets fixed correctly with a complete rebuffer for
 backward movements.  It may also belong in buffering not playback, haven't
 decided for sure

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15475 a1c6a512-1295-4272-9138-f99709370657
---
 apps/buffering.c  | 12 ------------
 apps/buffering.h  |  1 -
 apps/codecs/mpc.c |  1 -
 apps/dsp.h        |  1 -
 apps/playback.c   | 11 +++++------
 5 files changed, 5 insertions(+), 21 deletions(-)

diff --git a/apps/buffering.c b/apps/buffering.c
index e448e4238f..811c1e5d65 100644
--- a/apps/buffering.c
+++ b/apps/buffering.c
@@ -135,8 +135,6 @@ static volatile size_t buf_ridx;  /* current reading position */
 static size_t conf_watermark = 0; /* Level to trigger filebuf fill */
 static size_t conf_filechunk = 0; /* Bytes-per-read for buffering (impacts
                                      responsiveness of buffering thread) */
-static size_t conf_preseek   = 0; /* Distance a codec may look backwards after
-                                     seeking, to prevent double rebuffers */
 #if MEM > 8
 static size_t high_watermark = 0; /* High watermark for rebuffer */
 #endif
@@ -178,7 +176,6 @@ enum {
     /* Configuration: */
     Q_SET_WATERMARK,
     Q_SET_CHUNKSIZE,
-    Q_SET_PRESEEK,
     Q_FILL_BUFFER,       /* Request that the buffering thread initiate a buffer
                             fill at its earliest convenience */
 };
@@ -1117,10 +1114,6 @@ void buf_set_conf(int setting, size_t value)
             msg = Q_SET_CHUNKSIZE;
             break;
 
-        case BUFFERING_SET_PRESEEK:
-            msg = Q_SET_PRESEEK;
-            break;
-
         default:
             return;
     }
@@ -1254,11 +1247,6 @@ void buffering_thread(void)
                 }
                 break;
 
-            case Q_SET_PRESEEK:
-                LOGFQUEUE("buffering < Q_SET_PRESEEK");
-                conf_preseek = (size_t)ev.data;
-                break;
-
 #ifndef SIMULATOR
             case SYS_USB_CONNECTED:
                 LOGFQUEUE("buffering < SYS_USB_CONNECTED");
diff --git a/apps/buffering.h b/apps/buffering.h
index e6b99d3cf7..139dea7509 100644
--- a/apps/buffering.h
+++ b/apps/buffering.h
@@ -116,7 +116,6 @@ void unregister_buffer_low_callback(buffer_low_callback func);
 enum {
     BUFFERING_SET_WATERMARK = 1,
     BUFFERING_SET_CHUNKSIZE,
-    BUFFERING_SET_PRESEEK,
 };
 void buf_set_conf(int setting, size_t value);
 
diff --git a/apps/codecs/mpc.c b/apps/codecs/mpc.c
index 8143e04f71..4db8a186a2 100644
--- a/apps/codecs/mpc.c
+++ b/apps/codecs/mpc.c
@@ -79,7 +79,6 @@ enum codec_status codec_main(void)
     
     ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
     ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, 1024*16);
-    ci->configure(CODEC_SET_FILEBUF_PRESEEK, 0);
     
     /* Create a decoder instance */
     reader.read = read_impl;
diff --git a/apps/dsp.h b/apps/dsp.h
index 4e57adfc12..fffcba20e1 100644
--- a/apps/dsp.h
+++ b/apps/dsp.h
@@ -36,7 +36,6 @@ enum
 {
     CODEC_SET_FILEBUF_WATERMARK = 1,
     CODEC_SET_FILEBUF_CHUNKSIZE,
-    CODEC_SET_FILEBUF_PRESEEK,
     DSP_SWITCH_CODEC,
     DSP_SET_FREQUENCY,
     DSP_SWITCH_FREQUENCY,
diff --git a/apps/playback.c b/apps/playback.c
index 650a69bbed..b31db800ad 100644
--- a/apps/playback.c
+++ b/apps/playback.c
@@ -1663,10 +1663,6 @@ static void codec_configure_callback(int setting, intptr_t value)
         buf_set_conf(BUFFERING_SET_CHUNKSIZE, value);
         break;
 
-    case CODEC_SET_FILEBUF_PRESEEK:
-        buf_set_conf(BUFFERING_SET_PRESEEK, value);
-        break;
-
     default:
         if (!dsp_configure(setting, value)) { logf("Illegal key:%d", setting); }
     }
@@ -2295,7 +2291,6 @@ static bool audio_load_track(int offset, bool start_play)
         set_current_codec(CODEC_IDX_AUDIO);
         buf_set_conf(BUFFERING_SET_WATERMARK, AUDIO_DEFAULT_WATERMARK);
         buf_set_conf(BUFFERING_SET_CHUNKSIZE, AUDIO_DEFAULT_FILECHUNK);
-        buf_set_conf(BUFFERING_SET_PRESEEK, AUDIO_REBUFFER_GUESS_SIZE);
         dsp_configure(DSP_RESET, 0);
         set_current_codec(last_codec);
 
@@ -2441,8 +2436,12 @@ static bool audio_load_track(int offset, bool start_play)
 
     logf("alt:%s", trackname);
 
-    if (!file_offset && track_id3->first_frame_offset)
+    if (file_offset > AUDIO_REBUFFER_GUESS_SIZE)
+        file_offset -= AUDIO_REBUFFER_GUESS_SIZE;
+    else if (track_id3->first_frame_offset)
         file_offset = track_id3->first_frame_offset;
+    else
+        file_offset = 0;
 
     tracks[track_widx].audio_hid = bufopen(trackname, file_offset, type);
 
-- 
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