decoder/thread: load APE replay gain from remote files

NEWS

@@ -13,6 +13,7 @@ ver 0.20 (not yet released)
     (most importantly some mp3s)
   - id3: remove the "id3v1_encoding" setting; by definition, all ID3v1 tags
     are ISO-Latin-1
+  - ape: support APE replay gain on remote files
 * decoder
   - improved error logging
   - report I/O errors to clients

src/decoder/DecoderThread.cxx

@@ -242,6 +242,18 @@ decoder_run_stream_fallback(Decoder &decoder, InputStream &is)
 }
 
 /**
+ * Attempt to load replay gain data, and pass it to
+ * decoder_replay_gain().
+ */
+static void
+LoadReplayGain(Decoder &decoder, InputStream &is)
+{
+	ReplayGainInfo info;
+	if (replay_gain_ape_read(is, info))
+		decoder_replay_gain(decoder, &info);
+}
+
+/**
  * Try decoding a stream.
  *
  * DecoderControl::mutex is not locked by caller.
@@ -256,6 +268,8 @@ decoder_run_stream(Decoder &decoder, const char *uri)
 	if (input_stream == nullptr)
 		return false;
 
+	LoadReplayGain(decoder, *input_stream);
+
 	const ScopeLock protect(dc.mutex);
 
 	bool tried = false;