FS#11099 - Rewind before resume

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25706 a1c6a512-1295-4272-9138-f99709370657

apps/lang/english.lang

@@ -13511,3 +13511,20 @@
     *: none
   </voice>
 </phrase>
+<phrase>
+  id: LANG_RESUME_REWIND
+  desc: in playback settings menu
+  user: core
+  <source>
+    *: none
+    swcodec: "Rewind Before Resume"
+  </source>
+  <dest>
+    *: none
+    swcodec: "Rewind Before Resume"
+  </dest>
+  <voice>
+    *: none
+    swcodec: "Rewind before resume"
+  </voice>
+</phrase>

apps/menus/playback_menu.c

@@ -177,6 +177,7 @@ MAKE_MENU(unplug_menu, ID2P(LANG_HEADPHONE_UNPLUG), 0, Icon_NOICON,
 
 MENUITEM_SETTING(skip_length, &global_settings.skip_length, NULL);
 MENUITEM_SETTING(prevent_skip, &global_settings.prevent_skip, NULL);
+MENUITEM_SETTING(resume_rewind, &global_settings.resume_rewind, NULL);
 
 MAKE_MENU(playback_settings,ID2P(LANG_PLAYBACK),0,
           Icon_Playback_menu,
@@ -203,6 +204,10 @@ MAKE_MENU(playback_settings,ID2P(LANG_PLAYBACK),0,
          ,&unplug_menu
 #endif
          ,&skip_length, &prevent_skip,
+
+#if CONFIG_CODEC == SWCODEC
+          &resume_rewind,
+#endif
          );
          
 static int playback_callback(int action,const struct menu_item_ex *this_item)

apps/playback.c

@@ -1344,6 +1344,17 @@ static void audio_finish_load_track(void)
 
     track_id3->elapsed = 0;
     offset = track_id3->offset;
+    size_t resume_rewind = (global_settings.resume_rewind *
+                            track_id3->bitrate * 1000) / 8;
+
+    if (offset < resume_rewind)
+    {
+        offset = 0;
+    }
+    else
+    {
+        offset -= resume_rewind;
+    }
 
     enum data_type type = TYPE_PACKET_AUDIO;
 
@@ -1375,6 +1386,8 @@ static void audio_finish_load_track(void)
         break;
     }
 
+    track_id3->offset = offset;
+
     logf("load track: %s", track_id3->path);
 
     if (file_offset > AUDIO_REBUFFER_GUESS_SIZE)

apps/settings.h

@@ -823,6 +823,10 @@ struct user_settings
     int hotkey_tree;
 #endif
 
+#if CONFIG_CODEC == SWCODEC
+    /* When resuming playback (after a stop), rewind this number of seconds */
+    int resume_rewind;
+#endif
 };
 
 /** global variables **/

apps/settings_list.c

@@ -1683,6 +1683,12 @@ const struct settings_list settings[] = {
 #endif
         ID2P(LANG_ONPLAY_OPEN_WITH), ID2P(LANG_DELETE), ID2P(LANG_INSERT)),
 #endif
+
+#if CONFIG_CODEC == SWCODEC
+    INT_SETTING(0, resume_rewind, LANG_RESUME_REWIND, 0,
+                "resume rewind", UNIT_SEC, 0, 60, 5,
+                NULL, NULL, NULL),
+#endif
 };
 
 const int nb_settings = sizeof(settings)/sizeof(*settings);

manual/configure_rockbox/playback_options.tex

@@ -288,3 +288,14 @@ you to configure settings related to audio playback.
   if a track ends, which can be achieved by combining this option with
   \setting{Repeat} set to \setting{One}
 
+\opt{swcodec}{
+  \section{Rewind Before Resume}\index{Rewind Before Resume}
+    When resuming a track or a bookmark, a short rewind can be done before the
+    playback is started. This can be useful when listening to speech material,
+    to help remember what was being said just before playback was stopped.
+    The size of the rewind can be set to various values between 0 (off) and
+    60 seconds.
+    \note{The rewind is not done when resuming a paused track.}
+    \note{The actual rewind distance may differ a little from the requested
+      value, depending on the file in question.}
+}%\opt{swcodec}