Minamp 1.2

- Transcoding: send client identities Plex has a profile for (unknown ones get
  400 "unable to find a matching profile"), with a fresh session id per variant
- Stream proxy: fetch transcodes once into a temp file and serve every player
  request from it, so reconnects no longer restart the transcode (503s, tracks
  cut short); original files still pass Range requests through
- Sign-in: remember the pending link code so it survives Minamp being closed
  while the code is entered elsewhere; add "I've entered it - check now"
- Diagnostics: in-app connection log (DiagLog) with a streaming test and save
  to SD card; tokens are never logged

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/com/minamp/PlayerService.java

@@ -125,6 +125,7 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
     private String routeId;
     private int retries;
     private int[] variantOrder;   // transcode variant behind each URL of the current route
+    private int acceptedVariant = -1;
     private String refusal;       // what the server said when it refused the current stream
     private int refusalCode;
     private int failuresInRow;
@@ -166,6 +167,11 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
                 });
             }
         };
+        File cache = null;
+        try {
+            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) cache = getExternalCacheDir();
+        } catch (Exception ignored) {}
+        proxy.cacheDir = cache != null ? cache : getCacheDir();
         try { proxy.start(); } catch (IOException e) { /* reported when playback starts */ }
         try {
             TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
@@ -360,6 +366,8 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
     private void rememberVariantOf(int[] order, int index) {
         if (order == null || index < 0 || index >= order.length) return;
         int v = order[index];
+        if (order == variantOrder) acceptedVariant = v;
+        com.minamp.net.DiagLog.log("server accepted transcode variant " + v + " (" + Library.VARIANT_NAMES[v] + ")");
         if (v != Library.preferredVariant) {
             Library.preferredVariant = v;
             App.get().prefs.edit().putInt("tcVariant", v).commit();
@@ -387,7 +395,9 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
                 routeId = proxy.newId();
                 refusal = null;
                 refusalCode = 0;
-                mp.setDataSource(proxy.register(routeId, urls, ext));
+                acceptedVariant = -1;
+                // transcodes are fetched once and buffered, so player reconnects can't restart them
+                mp.setDataSource(proxy.register(routeId, urls, ext, transcoding));
             }
             setState(BUFFERING, "Buffering…");
             mp.prepareAsync();
@@ -520,7 +530,7 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
         if (track == null) return;
         if (ms < 0) ms = 0;
         if (track.duration > 0 && ms > track.duration - 1000) ms = Math.max(0, track.duration - 1000);
-        if (mp != null && prepared && (!transcoding || fromFile)) {
+        if (mp != null && prepared && (!transcoding || fromFile || proxy.isComplete(routeId))) {
             try { mp.seekTo((int) ms); } catch (Exception ignored) {}
             lastPos = ms;
             notifyListeners();
@@ -551,12 +561,13 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
 
     private void releasePlayer() {
         if (routeId != null) { proxy.unregister(routeId); routeId = null; }
-        if (session != null) {
-            final String s = session;
+        if (session != null && acceptedVariant >= 0) {
+            final String s = Library.variantSession(session, acceptedVariant);
             final App app = App.get();
             reporter.execute(new Runnable() { public void run() { if (app.library != null) app.library.stopTranscode(s); } });
-            session = null;
         }
+        session = null;
+        acceptedVariant = -1;
         if (mp != null) {
             try { mp.reset(); } catch (Exception ignored) {}
             try { mp.release(); } catch (Exception ignored) {}