Rework parts of the replaygain code to be able to differentiate between 0.00 dB set intentionally and having no replaygain information at all. Bump codec api.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29679 a1c6a512-1295-4272-9138-f99709370657

apps/codecs.h

@@ -75,12 +75,12 @@
 #define CODEC_ENC_MAGIC 0x52454E43 /* RENC */
 
 /* increase this every time the api struct changes */
-#define CODEC_API_VERSION 40
+#define CODEC_API_VERSION 41
 
 /* update this to latest version if a change to the api struct breaks
    backwards compatibility (and please take the opportunity to sort in any
    new function which are "waiting" at the end of the function table) */
-#define CODEC_MIN_API_VERSION 40
+#define CODEC_MIN_API_VERSION 41
 
 /* codec return codes */
 enum codec_status {

apps/dsp.c

@@ -1475,12 +1475,12 @@ intptr_t dsp_configure(struct dsp_config *dsp, int setting, intptr_t value)
 
     case DSP_SET_TRACK_GAIN:
         if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&track_gain, value ? convert_gain(value) : 0);
+            dsp_set_gain_var(&track_gain, value);
         break;
 
     case DSP_SET_ALBUM_GAIN:
         if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&album_gain, value ? convert_gain(value) : 0);
+            dsp_set_gain_var(&album_gain, value);
         break;
 
     case DSP_SET_TRACK_PEAK:

apps/gui/skin_engine/skin_tokens.c

@@ -1332,11 +1332,11 @@ const char *get_token_value(struct gui_wps *gwps,
                 /* due to above, coming here with !id3 shouldn't be possible */
                 case 2:
                 case 4:
-                    replaygain_itoa(buf, buf_size, id3->track_gain);
+                    replaygain_itoa(buf, buf_size, id3->track_level);
                     break;
                 case 3:
                 case 5:
-                    replaygain_itoa(buf, buf_size, id3->album_gain);
+                    replaygain_itoa(buf, buf_size, id3->album_level);
                     break;
             }
             return buf;

apps/metadata.h

@@ -282,6 +282,8 @@ struct mp3entry {
     
     /* replaygain support */
 #if CONFIG_CODEC == SWCODEC
+    long track_level;   /* holds the level in dB * (1<<FP_BITS) */
+    long album_level;
     long track_gain;    /* s19.12 signed fixed point. 0 for no gain. */
     long album_gain;
     long track_peak;    /* s19.12 signed fixed point. 0 for no peak. */

apps/replaygain.c

@@ -118,7 +118,7 @@ static long fp_atof(const char* s, int precision)
         + (((int64_t) frac_part * int_one) / frac_max_int));
 }
 
-long convert_gain(long gain)
+static long convert_gain(long gain)
 {
     /* Don't allow unreasonably low or high gain changes.
      * Our math code can't handle it properly anyway. :) */
@@ -171,13 +171,15 @@ void parse_replaygain(const char* key, const char* value,
          (strcasecmp(key, "rg_radio") == 0)) && 
         !entry->track_gain)
     {
-        entry->track_gain = get_replaygain(value);
+        entry->track_level = get_replaygain(value);
+        entry->track_gain  = convert_gain(entry->track_level);
     }
     else if (((strcasecmp(key, "replaygain_album_gain") == 0) || 
               (strcasecmp(key, "rg_audiophile") == 0)) && 
              !entry->album_gain)
     {
-        entry->album_gain = get_replaygain(value);
+        entry->album_level = get_replaygain(value);
+        entry->album_gain  = convert_gain(entry->album_level);
     }
     else if (((strcasecmp(key, "replaygain_track_peak") == 0) || 
               (strcasecmp(key, "rg_peak") == 0)) && 
@@ -207,12 +209,14 @@ void parse_replaygain_int(bool album, long gain, long peak,
 
     if (album)
     {
-        entry->album_gain = gain;
+        entry->album_level = gain;
-        entry->album_peak = peak;
+        entry->album_gain  = convert_gain(gain);
+        entry->album_peak  = peak;
     }
     else
     {
-        entry->track_gain = gain;
+        entry->track_level = gain;
-        entry->track_peak = peak;
+        entry->track_gain  = convert_gain(gain);
+        entry->track_peak  = peak;
     }
 }

apps/replaygain.h

@@ -30,6 +30,5 @@ void parse_replaygain(const char* key, const char* value,
 void parse_replaygain_int(bool album, long gain, long peak,
                           struct mp3entry* entry);
 void replaygain_itoa(char* buffer, int length, long int_gain);
-long convert_gain(long gain);
 
 #endif

apps/screens.c

@@ -729,12 +729,12 @@ static const char* id3_get_info(int selected_item, void* data,
                 break;
 #if CONFIG_CODEC == SWCODEC
             case LANG_ID3_TRACK_GAIN:
-                replaygain_itoa(buffer, buffer_len, id3->track_gain);
+                replaygain_itoa(buffer, buffer_len, id3->track_level);
-                val=(id3->track_gain) ? buffer : NULL; /* only show gains!=0 */
+                val=(id3->track_level) ? buffer : NULL; /* only show level!=0 */
                 break;
             case LANG_ID3_ALBUM_GAIN:
-                replaygain_itoa(buffer, buffer_len, id3->album_gain);
+                replaygain_itoa(buffer, buffer_len, id3->album_level);
-                val=(id3->album_gain) ? buffer : NULL; /* only show gains!=0 */
+                val=(id3->album_level) ? buffer : NULL; /* only show level!=0 */
                 break;
 #endif
             case LANG_ID3_PATH: