apps/abrepeat.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Ray Lambert
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef _ABREPEAT_H_
  22 #define _ABREPEAT_H_
  23
  24 #ifdef AB_REPEAT_ENABLE
  25 #include <stdbool.h>
  26 #include "audio.h"
  27 #include "kernel.h" /* needed for HZ */
  28
  29 #define AB_MARKER_NONE 0
  30
  31 #include "settings.h"
  32
  33 void ab_repeat_init(void);
  34 #if 0 /* Currently unused */
  35 unsigned int ab_get_A_marker(void);
  36 unsigned int ab_get_B_marker(void);
  37 #endif /* if 0 */
  38 bool ab_before_A_marker(unsigned int song_position);
  39 bool ab_after_A_marker(unsigned int song_position);
  40 void ab_jump_to_A_marker(void);
  41 void ab_reset_markers(void);
  42 void ab_set_A_marker(unsigned int song_position);
  43 void ab_set_B_marker(unsigned int song_position);
  44 #if (CONFIG_CODEC == SWCODEC)
  45 void ab_end_of_track_report(void);
  46 #endif
  47 #ifdef HAVE_LCD_BITMAP
  48 #include "screen_access.h"
  49 void ab_draw_markers(struct screen * screen, int capacity,
  50                      int x, int y, int w, int h);
  51 #endif
  52
  53 /* These functions really need to be inlined for speed */
  54 extern unsigned int ab_A_marker;
  55 extern unsigned int ab_B_marker;
  56
  57 static inline bool ab_A_marker_set(void)
  58 {
  59     return ab_A_marker != AB_MARKER_NONE;
  60 }
  61
  62 static inline bool ab_B_marker_set(void)
  63 {
  64     return ab_B_marker != AB_MARKER_NONE;
  65 }
  66
  67 static inline bool ab_repeat_mode_enabled(void)
  68 {
  69     return global_settings.repeat_mode == REPEAT_AB;
  70 }
  71
  72 static inline bool ab_reached_B_marker(unsigned int song_position)
  73 {
  74 /* following is the size of the window in which we'll detect that the B marker
  75 was hit; it must be larger than the frequency (in milliseconds) at which this
  76 function is called otherwise detection of the B marker will be unreliable */
  77 #if (CONFIG_CODEC == SWCODEC)
  78 /* On swcodec, the worst case seems to be 9600kHz with 1024 samples between
  79  * calls, meaning ~9 calls per second, look within 1/5 of a second */
  80 #define B_MARKER_DETECT_WINDOW 200
  81 #else
  82 /* we assume that this function will be called on each system tick and derive
  83 the window size from this with a generous margin of error (note: the number
  84 of ticks per second is given by HZ) */
  85 #define B_MARKER_DETECT_WINDOW ((1000/HZ)*10)
  86 #endif
  87     if (ab_B_marker != AB_MARKER_NONE)
  88     {
  89         if ( (song_position >= ab_B_marker)
  90         && (song_position <= (ab_B_marker+B_MARKER_DETECT_WINDOW)) )
  91             return true;
  92     }
  93     return false;
  94 }
  95
  96 #if (CONFIG_CODEC == SWCODEC)
  97 static inline void ab_position_report(unsigned long position)
  98 {
  99     if (ab_repeat_mode_enabled())
 100     {
 101         if ( !(audio_status() & AUDIO_STATUS_PAUSE) &&
 102                 ab_reached_B_marker(position) )
 103         {
 104             ab_jump_to_A_marker();
 105         }
 106     }
 107 }
 108 #endif
 109
 110 #endif
 111
 112 #endif /* _ABREPEAT_H_ */