Patch #1105616 by Ray Lambert - A-B Repeat for Archos studio/recorder, still not 100% complete, but I wanted to commit it before the 2.5 feature freeze

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7380 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 251 insertions, 0 deletions

diff --git a/apps/abrepeat.c b/apps/abrepeat.c
new file mode 100644
index 0000000000..3a3d5b394d
--- /dev/null
+++ b/apps/abrepeat.c
@@ -0,0 +1,251 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $$
+ *
+ * Copyright (C) 2005 Ray Lambert
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "abrepeat.h"
+
+#include "settings.h"
+#include "audio.h"
+#include "kernel.h"
+
+#ifdef HAVE_LCD_BITMAP
+#include "lcd.h"
+#endif
+
+#ifdef AB_REPEAT_ENABLE
+
+static int ab_audio_event_handler(unsigned short event, unsigned long data)
+{
+    int rc = AUDIO_EVENT_RC_IGNORED;
+    if ( ab_repeat_mode_enabled() )
+    {
+        switch(event)
+        {
+            case AUDIO_EVENT_POS_REPORT:
+            {
+                if ( ! (audio_status() & AUDIO_STATUS_PAUSE) && ab_reached_B_marker(data) )
+                {
+                    ab_jump_to_A_marker();
+                    rc = AUDIO_EVENT_RC_HANDLED;
+                }
+                break;
+            }
+            case AUDIO_EVENT_END_OF_TRACK:
+            {
+                if ( ab_A_marker_set() && ! ab_B_marker_set() )
+                {
+                    ab_jump_to_A_marker();
+                    rc = AUDIO_EVENT_RC_HANDLED;
+                }
+                break;
+            }
+        }
+    }
+    return rc;
+}
+
+void ab_repeat_init(void)
+{
+    static bool ab_initialized = false;
+    if ( ! ab_initialized )
+    {
+        ab_initialized = true;
+        audio_register_event_handler(ab_audio_event_handler,
+            AUDIO_EVENT_POS_REPORT | AUDIO_EVENT_END_OF_TRACK );
+    }
+}
+
+static unsigned int ab_A_marker = AB_MARKER_NONE;
+static unsigned int ab_B_marker = AB_MARKER_NONE;
+
+bool ab_repeat_mode_enabled(void)
+{
+	extern struct user_settings global_settings;
+    return global_settings.repeat_mode == REPEAT_AB;
+}
+
+bool ab_A_marker_set(void)
+{
+    return ab_A_marker != AB_MARKER_NONE;
+}
+
+bool ab_B_marker_set(void)
+{
+    return ab_B_marker != AB_MARKER_NONE;
+}
+
+unsigned int ab_get_A_marker(void)
+{
+    return ab_A_marker;
+}
+
+unsigned int ab_get_B_marker(void)
+{
+    return ab_B_marker;
+}
+
+bool ab_reached_B_marker(unsigned int song_position)
+{
+/* following is the size of the window in which we'll detect that the B marker
+was hit; it must be larger than the frequency (in milliseconds) at which this 
+function is called otherwise detection of the B marker will be unreliable;
+we assume that this function will be called on each system tick and derive
+the window size from this with a generous margin of error (note: the number 
+of ticks per second is given by HZ) */
+#define B_MARKER_DETECT_WINDOW ((1000/HZ)*10)
+    if (ab_B_marker != AB_MARKER_NONE)
+    {
+        if ( (song_position >= ab_B_marker) 
+        && (song_position <= (ab_B_marker+B_MARKER_DETECT_WINDOW)) )
+            return true;
+    }
+    return false;
+}
+
+/* determines if the given song position is earlier than the A mark;
+intended for use in handling the jump NEXT and PREV commands */
+bool ab_before_A_marker(unsigned int song_position)
+{
+    return (ab_A_marker != AB_MARKER_NONE)
+        && (song_position < ab_A_marker);
+}
+
+/* determines if the given song position is later than the A mark;
+intended for use in handling the jump PREV command */
+bool ab_after_A_marker(unsigned int song_position)
+{
+/* following is the size of the virtual A marker; we pretend that the A marker is
+larger than a single instant in order to give the user time to hit PREV again to
+jump back to the start of the song; it should be large enough to allow a
+reasonable amount of time for the typical user to react */
+#define A_MARKER_VIRTUAL_SIZE 1000
+    return (ab_A_marker != AB_MARKER_NONE)
+        && (song_position > (ab_A_marker+A_MARKER_VIRTUAL_SIZE));
+}
+
+void ab_jump_to_A_marker(void)
+{
+    bool paused = (audio_status() & AUDIO_STATUS_PAUSE) != 0;
+    if ( ! paused )
+        audio_pause();
+    audio_ff_rewind(ab_A_marker);
+    if ( ! paused )
+        audio_resume();
+}
+
+void ab_reset_markers(void)
+{
+    ab_A_marker = AB_MARKER_NONE;
+    ab_B_marker = AB_MARKER_NONE;
+}
+
+/* following is a fudge factor to help overcome the latency between
+the time the user hears the passage they want to mark and the time
+they actually press the button; the actual song position is adjusted
+by this fudge factor when setting a mark */
+#define EAR_TO_HAND_LATENCY_FUDGE 200
+
+void ab_set_A_marker(unsigned int song_position)
+{
+    ab_A_marker = song_position;
+    ab_A_marker = (ab_A_marker >= EAR_TO_HAND_LATENCY_FUDGE) 
+        ? (ab_A_marker - EAR_TO_HAND_LATENCY_FUDGE) : 0;
+    /* check if markers are out of order */
+    if ( (ab_B_marker != AB_MARKER_NONE) && (ab_A_marker > ab_B_marker) )
+        ab_B_marker = AB_MARKER_NONE;
+}
+
+void ab_set_B_marker(unsigned int song_position)
+{
+    ab_B_marker = song_position;
+    ab_B_marker = (ab_B_marker >= EAR_TO_HAND_LATENCY_FUDGE) 
+        ? (ab_B_marker - EAR_TO_HAND_LATENCY_FUDGE) : 0;
+    /* check if markers are out of order */
+    if ( (ab_A_marker != AB_MARKER_NONE) && (ab_B_marker < ab_A_marker) )
+        ab_A_marker = AB_MARKER_NONE;
+}
+
+#ifdef HAVE_LCD_BITMAP
+
+static int ab_calc_mark_x_pos(int mark, int capacity, int offset, int size)
+{
+    int w = size - offset;
+    return offset + ( (w * mark) / capacity );
+}
+
+static void ab_draw_veritcal_line_mark(int x, int y, int h)
+{
+    lcd_set_drawmode(DRMODE_COMPLEMENT);
+    lcd_vline(x, y, y+h-1);
+}
+
+#define DIRECTION_RIGHT 1
+#define DIRECTION_LEFT -1
+
+static void ab_draw_arrow_mark(int x, int y, int h, int direction)
+{
+    /* draw lines in decreasing size until a height of zero is reached */
+    lcd_set_drawmode(DRMODE_SOLID|DRMODE_INVERSEVID);
+    while( h > 0 )
+    {
+        lcd_vline(x, y, y+h-1);
+        h -= 2;
+        y++;
+        x += direction;
+        lcd_set_drawmode(DRMODE_COMPLEMENT);
+    }
+}
+
+void ab_draw_markers(int capacity, int x, int y, int w, int h)
+{
+    /* if both markers are set, determine if they're far enough apart
+    to draw arrows */
+    if ( ab_A_marker_set() && ab_B_marker_set() )
+    {
+        int xa = ab_calc_mark_x_pos(ab_A_marker, capacity, x, w);
+        int xb = ab_calc_mark_x_pos(ab_B_marker, capacity, x, w);
+        int arrow_width = (h+1) / 2;
+        if ( (xb-xa) < (arrow_width*2) )
+        {
+            ab_draw_veritcal_line_mark(xa, y, h);
+            ab_draw_veritcal_line_mark(xb, y, h);
+        }
+        else
+        {
+            ab_draw_arrow_mark(xa, y, h, DIRECTION_RIGHT);
+            ab_draw_arrow_mark(xb, y, h, DIRECTION_LEFT);
+        }
+    }
+    else
+    {
+        if (ab_A_marker_set())
+        {
+            int xa = ab_calc_mark_x_pos(ab_A_marker, capacity, x, w);
+            ab_draw_arrow_mark(xa, y, h, DIRECTION_RIGHT);
+        }
+        if (ab_B_marker_set())
+        {
+            int xb = ab_calc_mark_x_pos(ab_B_marker, capacity, x, w);
+            ab_draw_arrow_mark(xb, y, h, DIRECTION_LEFT);
+        }
+    }
+}
+
+#endif /* HAVE_LCD_BITMAP */
+
+#endif /* AB_REPEAT_ENABLE */