From 65240761fbcee1274836b74295c10247ca3d8ceb Mon Sep 17 00:00:00 2001
From: Eric Linenberg <elinenbe@umich.edu>
Date: Wed, 28 Aug 2002 19:34:07 +0000
Subject: [PATCH] Nate Nystrom's ff/rw acceleration patch

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2044 a1c6a512-1295-4272-9138-f99709370657
---
 apps/settings.c      |  9 ++++++++-
 apps/settings.h      |  3 ++-
 apps/settings_menu.c | 11 +++++++++++
 apps/wps.c           | 46 ++++++++++++++++++++++++++++++++++++++++----
 4 files changed, 63 insertions(+), 6 deletions(-)

diff --git a/apps/settings.c b/apps/settings.c
index ef74a5bb92..bb64886efd 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -65,10 +65,12 @@ offset  abs
 0x0d    0x21    <resume settings byte>
 0x0e    0x22    <shuffle,mp3filter,sort_case,discharge,statusbar,show_hidden>
 0x0f    0x23    <scroll speed & WPS display byte>
-0x10    0x24    <playlist options byte>
+0x10    0x24    <ff/rewind step size>
 0x11    0x25    <AVC byte>
 0x12    0x26    <(int) Resume playlist index, or -1 if no playlist resume>
 0x16    0x2a    <(int) Byte offset into resume file>
+0x1a    0x2e    <time until disk spindown>
+0x1b    0x2f    <ff/rewind acceleration rate>
 
         <all unused space filled with 0xff>
 
@@ -269,6 +271,7 @@ int settings_save( void )
     config_block[0x10] = (unsigned char)global_settings.ff_rewind;
     config_block[0x11] = (unsigned char)global_settings.avc;
     config_block[0x1a] = (unsigned char)global_settings.disk_spindown;
+    config_block[0x1b] = (unsigned char)global_settings.ff_rewind_accel;
 
     memcpy(&config_block[0x12], &global_settings.resume_index, 4);
     memcpy(&config_block[0x16], &global_settings.resume_offset, 4);
@@ -373,6 +376,9 @@ void settings_load(void)
         if (config_block[0x1a] != 0xFF)
             global_settings.disk_spindown = config_block[0x1a];
 
+        if (config_block[0x1b] != 0xFF)
+            global_settings.ff_rewind_accel = config_block[0x1b];
+
         memcpy(&global_settings.resume_seed, &config_block[0xF8], 4);
 
         if (config_block[0x24] != 0xFF)
@@ -419,6 +425,7 @@ void settings_reset(void) {
     global_settings.scroll_speed = 8;
     global_settings.show_hidden_files = false;
     global_settings.ff_rewind    = DEFAULT_FF_REWIND_SETTING;
+    global_settings.ff_rewind_accel = DEFAULT_FF_REWIND_ACCEL_SETTING;
     global_settings.resume_index = -1;
     global_settings.resume_offset = -1;
     global_settings.disk_spindown = 5;
diff --git a/apps/settings.h b/apps/settings.h
index 91ffb3ed90..b67af46bd7 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -64,6 +64,7 @@ struct user_settings
     int scroll_speed;  /* long texts scrolling speed: 1-20 */
     bool playlist_shuffle;
     int ff_rewind;     /* FF/Rewind step size (in seconds) */
+    int ff_rewind_accel; /* FF/Rewind acceleration (in seconds per doubling) */
     int disk_spindown; /* time until disk spindown, in seconds (0=off) */
 
     /* while playing screen settings  */
@@ -78,7 +79,6 @@ struct user_settings
     
     /* geeky persistent statistics */
     unsigned int total_uptime; /* total uptime since rockbox was first booted */
-
 };
 
 /* prototypes */
@@ -116,5 +116,6 @@ extern struct user_settings global_settings;
 #define DEFAULT_BACKLIGHT_SETTING   5
 #define DEFAULT_WPS_DISPLAY         0 
 #define DEFAULT_FF_REWIND_SETTING   2
+#define DEFAULT_FF_REWIND_ACCEL_SETTING 3
 
 #endif /* __SETTINGS_H__ */
diff --git a/apps/settings_menu.c b/apps/settings_menu.c
index 9f36d3be2b..ffc6f6aab9 100644
--- a/apps/settings_menu.c
+++ b/apps/settings_menu.c
@@ -179,6 +179,16 @@ static Menu spindown(void)
     return MENU_OK;
 }
 
+static Menu ff_rewind_accel(void)
+{
+    char* names[] = { "off   ", "2x/1s ", "2x/2s ", "2x/3s ",
+                      "2x/4s ", "2x/5s ", "2x/6s ", "2x/7s ",
+                      "2x/8s ", "2x/9s ", "2x/10s" };
+    set_option("[FF/Rewind Accel]", &global_settings.ff_rewind_accel,
+               names, 11 );
+    return MENU_OK;
+}
+
 Menu settings_menu(void)
 {
     int m;
@@ -200,6 +210,7 @@ Menu settings_menu(void)
 #endif
         { "Show hidden files", show_hidden_files },
         { "FF/Rewind",       ff_rewind       },
+        { "FF/Rewind Accel", ff_rewind_accel },
         { "Resume",          resume          },
         { "Disk spindown",   spindown        },
     };
diff --git a/apps/wps.c b/apps/wps.c
index 38e9aa43af..55afd4da73 100644
--- a/apps/wps.c
+++ b/apps/wps.c
@@ -44,6 +44,9 @@
 #include "ajf.h"
 #endif
 
+#define FF_REWIND_MAX_PERCENT 3 /* cap ff/rewind step size at max % of file */
+                                /* 3% of 30min file == 54s step size */
+
 #ifdef HAVE_LCD_BITMAP
     #define PLAY_DISPLAY_2LINEID3        0 
     #define PLAY_DISPLAY_FILENAME_SCROLL 1 
@@ -714,6 +717,9 @@ int wps_show(void)
     int old_release_mask;
     int button;
     int ff_rewind_count = 0;
+    unsigned int ff_rewind_step = 0; /* current rewind step size */
+    unsigned int ff_rewind_max_step = 0; /* max rewind step size */
+    long ff_rewind_accel_tick = 0; /* next time to bump ff/rewind step size */
     bool ignore_keyup = true;
     bool restore = false;
 
@@ -853,7 +859,16 @@ int wps_show(void)
                 {
                     if (ff_rewind)
                     {
-                        ff_rewind_count -= global_settings.ff_rewind*1000;
+                        ff_rewind_count -= ff_rewind_step;
+                        if (global_settings.ff_rewind_accel != 0 &&
+                            current_tick >= ff_rewind_accel_tick)
+                        {
+                            ff_rewind_step *= 2;
+                            if (ff_rewind_step > ff_rewind_max_step)
+                                ff_rewind_step = ff_rewind_max_step;
+                            ff_rewind_accel_tick = current_tick +
+                                global_settings.ff_rewind_accel*HZ;
+                        }
                     }
                     else
                     {
@@ -867,7 +882,14 @@ int wps_show(void)
                             status_set_playmode(STATUS_FASTBACKWARD);
                             status_draw();
                             ff_rewind = true;
-                            ff_rewind_count = -global_settings.ff_rewind*1000;
+                            ff_rewind_max_step =
+                                id3->length * FF_REWIND_MAX_PERCENT / 100;
+                            ff_rewind_step = global_settings.ff_rewind*1000;
+                            if (ff_rewind_step > ff_rewind_max_step)
+                                ff_rewind_step = ff_rewind_max_step;
+                            ff_rewind_count = -ff_rewind_step;
+                            ff_rewind_accel_tick = current_tick +
+                                global_settings.ff_rewind_accel*HZ;
                         }
                         else
                             break;
@@ -886,7 +908,16 @@ int wps_show(void)
                 {
                     if (ff_rewind)
                     {
-                        ff_rewind_count += global_settings.ff_rewind*1000;
+                        ff_rewind_count += ff_rewind_step;
+                        if (global_settings.ff_rewind_accel != 0 &&
+                            current_tick >= ff_rewind_accel_tick)
+                        {
+                            ff_rewind_step *= 2;
+                            if (ff_rewind_step > ff_rewind_max_step)
+                                ff_rewind_step = ff_rewind_max_step;
+                            ff_rewind_accel_tick = current_tick +
+                                global_settings.ff_rewind_accel*HZ;
+                        }
                     }
                     else
                     {
@@ -900,7 +931,14 @@ int wps_show(void)
                             status_set_playmode(STATUS_FASTFORWARD);
                             status_draw();
                             ff_rewind = true;
-                            ff_rewind_count = global_settings.ff_rewind*1000;
+                            ff_rewind_max_step =
+                                id3->length * FF_REWIND_MAX_PERCENT / 100;
+                            ff_rewind_step = global_settings.ff_rewind*1000;
+                            if (ff_rewind_step > ff_rewind_max_step)
+                                ff_rewind_step = ff_rewind_max_step;
+                            ff_rewind_count = ff_rewind_step;
+                            ff_rewind_accel_tick = current_tick +
+                                global_settings.ff_rewind_accel*HZ;
                         }
                         else
                             break;