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 bool ab_before_A_marker(unsigned int song_position);
  35 bool ab_after_A_marker(unsigned int song_position);
  36 void ab_jump_to_A_marker(void);
  37 void ab_reset_markers(void);
  38 void ab_set_A_marker(unsigned int song_position);
  39 void ab_set_B_marker(unsigned int song_position);
  40 #if (CONFIG_CODEC == SWCODEC)
  41 void ab_end_of_track_report(void);
  42 #endif
  43 #ifdef HAVE_LCD_BITMAP
  44 #include "screen_access.h"
  45 void ab_draw_markers(struct screen * screen, int capacity,
  46                      int x, int y, int w, int h);
  47 #endif
  48
  49 /* These functions really need to be inlined for speed */
  50 extern unsigned int ab_A_marker;
  51 extern unsigned int ab_B_marker;
  52
  53 static inline bool ab_repeat_mode_enabled(void)
  54 {
  55     return global_settings.repeat_mode == REPEAT_AB;
  56 }
  57
  58 static inline bool ab_reached_B_marker(unsigned int song_position)
  59 {
  60 /* following is the size of the window in which we'll detect that the B marker
  61 was hit; it must be larger than the frequency (in milliseconds) at which this
  62 function is called otherwise detection of the B marker will be unreliable */
  63 #if (CONFIG_CODEC == SWCODEC)
  64 /* On swcodec, the worst case seems to be 9600kHz with 1024 samples between
  65  * calls, meaning ~9 calls per second, look within 1/5 of a second */
  66 #define B_MARKER_DETECT_WINDOW 200
  67 #else
  68 /* we assume that this function will be called on each system tick and derive
  69 the window size from this with a generous margin of error (note: the number
  70 of ticks per second is given by HZ) */
  71 #define B_MARKER_DETECT_WINDOW ((1000/HZ)*10)
  72 #endif
  73     if (ab_B_marker != AB_MARKER_NONE)
  74     {
  75         if ( (song_position >= ab_B_marker)
  76         && (song_position <= (ab_B_marker+B_MARKER_DETECT_WINDOW)) )
  77             return true;
  78     }
  79     return false;
  80 }
  81
  82 #if (CONFIG_CODEC == SWCODEC)
  83 static inline void ab_position_report(unsigned long position)
  84 {
  85     if (ab_repeat_mode_enabled())
  86     {
  87         if ( !(audio_status() & AUDIO_STATUS_PAUSE) &&
  88                 ab_reached_B_marker(position) )
  89         {
  90             ab_jump_to_A_marker();
  91         }
  92     }
  93 }
  94 #endif
  95
  96 #endif
  97
  98 #endif /* _ABREPEAT_H_ */