Added MP3 buffer margin setting

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2939 a1c6a512-1295-4272-9138-f99709370657

apps/debug_menu.c

@@ -174,10 +174,11 @@ bool dbg_mpeg_thread(void)
         percent = d.unplayed_space * 100 / d.mp3buflen;
         progressbar(0, 6*8, 112, 4, percent, Grow_Right);
 
-        percent = MPEG_LOW_WATER * 100 / d.mp3buflen;
+        percent = d.low_watermark_level * 100 / d.mp3buflen;
         progressbar(0, 6*8+4, 112, 4, percent, Grow_Right);
 
-        snprintf(buf, sizeof(buf), "lowest: %x", d.lowest_watermark_level);
+        snprintf(buf, sizeof(buf), "wm: %x - %x",
+                 d.low_watermark_level, d.lowest_watermark_level);
         lcd_puts(0, 7, buf);
         
         lcd_update();

apps/lang/english.lang

@@ -1171,3 +1171,8 @@ id: LANG_SLEEP_TIMER
 desc: sleep timer setting
 eng: "Sleep timer"
 new:
+
+id: LANG_MP3BUFFER_MARGIN
+desc: MP3 buffer margin time
+eng: "MP3 buffer margin"
+new:

apps/settings.c

@@ -105,7 +105,7 @@ offset  abs
 0x22    0x36    <rec. quality (bit 0-2), source (bit 3-4), frequency (bit 5-7)>
 0x23    0x37    <rec. left gain (bit 0-3)>
 0x24    0x38    <rec. right gain (bit 0-3)>
-0x25    0x39    <disk_spindown flag>
+0x25    0x39    <disk poweroff flag (bit 0), MP3 buffer margin (bit 1-3)>
 0x26    0x40    <runtime low byte>
 0x27    0x41    <runtime high byte>
 0x28    0x42    <topruntime low byte>
@@ -344,7 +344,9 @@ int settings_save( void )
          ((global_settings.rec_frequency & 7) << 5));
     config_block[0x23] = (unsigned char)global_settings.rec_left_gain;
     config_block[0x24] = (unsigned char)global_settings.rec_right_gain;
-    config_block[0x25] = (unsigned char)global_settings.disk_poweroff & 1;
+    config_block[0x25] = (unsigned char)
+        ((global_settings.disk_poweroff & 1) |
+         ((global_settings.buffer_margin & 7) << 1));
 
     {
         static long lasttime = 0;
@@ -618,7 +620,10 @@ void settings_load(void)
             global_settings.rec_right_gain = config_block[0x24] & 0x0f;
 
         if (config_block[0x25] != 0xFF)
+        {
             global_settings.disk_poweroff = config_block[0x25] & 1;
+            global_settings.buffer_margin = (config_block[0x25] >> 1) & 7;
+        }
 
         if (config_block[0x27] != 0xff)
             global_settings.runtime = 
@@ -819,6 +824,7 @@ void settings_reset(void) {
     global_settings.resume_offset = -1;
     global_settings.disk_spindown = 5;
     global_settings.disk_poweroff = false;
+    global_settings.buffer_margin = 0;
     global_settings.browse_current = false;
     global_settings.play_selected = true;
     global_settings.peak_meter_release = 8;

apps/settings.h

@@ -112,6 +112,7 @@ struct user_settings
     int ff_rewind_accel; /* FF/Rewind acceleration (in seconds per doubling) */
     int disk_spindown; /* time until disk spindown, in seconds (0=off) */
     bool disk_poweroff; /* whether to cut disk power after spindown or not */
+    int buffer_margin; /* MP3 buffer watermark margin, in seconds */
 
     int peak_meter_release;   /* units per read out */
     int peak_meter_hold;      /* hold time for peak meter in 1/100 s */

apps/settings_menu.c

@@ -496,6 +496,13 @@ static bool poweroff(void)
 }
 #endif
 
+static bool buffer_margin(void)
+{
+    return set_int(str(LANG_MP3BUFFER_MARGIN), "s",
+                   &global_settings.buffer_margin,
+                   mpeg_set_buffer_margin, 1, 0, 7 );
+}
+
 static bool ff_rewind_min_step(void) 
 { 
     char* names[] = { "1s", "2s", "3s", "4s",
@@ -535,6 +542,7 @@ static bool playback_settings_menu(void)
         { str(LANG_RESUME), resume },
         { str(LANG_FFRW_STEP), ff_rewind_min_step },
         { str(LANG_FFRW_ACCEL), ff_rewind_accel },
+        { str(LANG_MP3BUFFER_MARGIN), buffer_margin },
     };
 
     bool old_shuffle = global_settings.playlist_shuffle;

firmware/mpeg.c

@@ -470,6 +470,7 @@ static bool filling; /* We are filling the buffer with data from disk */
 static bool dma_underrun; /* True when the DMA has stopped because of
                              slow disk reading (read error, shaking) */
 static int low_watermark; /* Dynamic low watermark level */
+static int low_watermark_margin; /* Extra time in seconds for watermark */
 static int lowest_watermark_level; /* Debug value to observe the buffer
                                       usage */
 #ifdef HAVE_MAS3587F
@@ -492,7 +493,8 @@ static void recalculate_watermark(int bitrate)
 {
     if(ata_spinup_time)
     {
-        low_watermark = ata_spinup_time * 3 / HZ * bitrate*1000 / 8;
+        low_watermark = (low_watermark_margin + ata_spinup_time * 3 / HZ) *
+            bitrate*1000 / 8;
     }
     else
     {
@@ -500,6 +502,11 @@ static void recalculate_watermark(int bitrate)
     }
 }
 
+void mpeg_set_buffer_margin(int seconds)
+{
+    low_watermark_margin = seconds;
+}
+
 void mpeg_get_debugdata(struct mpeg_debug *dbgdata)
 {
     dbgdata->mp3buflen = mp3buflen;

firmware/mpeg.h

@@ -85,6 +85,7 @@ unsigned long mpeg_num_recorded_frames(void);
 unsigned long mpeg_num_recorded_bytes(void);
 #endif
 void mpeg_get_debugdata(struct mpeg_debug *dbgdata);
+void mpeg_set_buffer_margin(int seconds);
 
 #define SOUND_VOLUME 0
 #define SOUND_BASS 1