From 03d08ecc250ee095f46a77848bde28f162493276 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Fri, 13 May 2005 00:16:14 +0000
Subject: (1) Wait for the MAS to run out of buffered data on fade out. Fixes
 bug #778930/#1189756. (2) Fade in/out from/to zero. (3) Always fade in 30
 steps, independent of the global volume.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6463 a1c6a512-1295-4272-9138-f99709370657
---
 apps/wps.c                     | 27 ++++++++++++++++-----------
 firmware/export/mp3_playback.h |  1 +
 firmware/mp3_playback.c        | 13 +++++++++++++
 3 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/apps/wps.c b/apps/wps.c
index e281131836..097c908ca8 100644
--- a/apps/wps.c
+++ b/apps/wps.c
@@ -384,34 +384,39 @@ static bool update(void)
 
 static void fade(bool fade_in)
 {
+    unsigned fp_global_vol = global_settings.volume << 8;
+    unsigned fp_step = fp_global_vol / 30;
+
     if (fade_in) {
         /* fade in */
-        int current_volume = 20;
-        
+        unsigned fp_volume = 0;
+
         /* zero out the sound */
-        sound_set(SOUND_VOLUME, current_volume);
+        sound_set(SOUND_VOLUME, 0);
 
         sleep(HZ/10); /* let audio thread run */
         audio_resume();
         
-        while (current_volume < global_settings.volume) {    
-            current_volume += 2;
+        while (fp_volume < fp_global_vol) {
+            fp_volume += fp_step;
             sleep(1);
-            sound_set(SOUND_VOLUME, current_volume);
+            sound_set(SOUND_VOLUME, fp_volume >> 8);
         }
         sound_set(SOUND_VOLUME, global_settings.volume);
     }
     else {
         /* fade out */
-        int current_volume = global_settings.volume;
+        unsigned fp_volume = fp_global_vol;
 
-        while (current_volume > 20) {    
-            current_volume -= 2;
+        while (fp_volume > fp_step) {
+            fp_volume -= fp_step;
             sleep(1);
-            sound_set(SOUND_VOLUME, current_volume);
+            sound_set(SOUND_VOLUME, fp_volume >> 8);
         }
         audio_pause();
-        sleep(HZ/5); /* let audio thread run */
+        /* let audio thread run and wait for the mas to run out of data */
+        while (!mp3_pause_done())
+            sleep(HZ/10);
 
         /* reset volume to what it was before the fade */
         sound_set(SOUND_VOLUME, global_settings.volume);
diff --git a/firmware/export/mp3_playback.h b/firmware/export/mp3_playback.h
index 4da1ffce6d..3611c1c9c1 100644
--- a/firmware/export/mp3_playback.h
+++ b/firmware/export/mp3_playback.h
@@ -42,6 +42,7 @@ void mp3_play_data(const unsigned char* start, int size,
     void (*get_more)(unsigned char** start, int* size) /* callback fn */
 );
 void mp3_play_pause(bool play);
+bool mp3_pause_done(void);
 void mp3_play_stop(void);
 long mp3_get_playtime(void);
 void mp3_reset_playtime(void);
diff --git a/firmware/mp3_playback.c b/firmware/mp3_playback.c
index 67a5ff739b..a8d2d698eb 100644
--- a/firmware/mp3_playback.c
+++ b/firmware/mp3_playback.c
@@ -542,6 +542,19 @@ void mp3_play_pause(bool play)
         paused = true;
         cumulative_ticks += current_tick - playstart_tick;
     }
+}     
+
+bool mp3_pause_done(void)
+{
+    unsigned long frame_count;
+
+    if (!paused)
+        return false;
+    
+    mas_readmem(MAS_BANK_D0, MAS_D0_MPEG_FRAME_COUNT, &frame_count, 1);
+    /* This works because the frame counter never wraps,
+     * i.e. zero always means lost sync. */
+    return frame_count == 0;
 }
 
 void mp3_play_stop(void)
-- 
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