decoder/Control: throw exception on Seek() error

src/command/AllCommands.cxx

@@ -362,7 +362,6 @@ CommandResult
 command_process(Client &client, unsigned num, char *line)
 try {
 	Response r(client, num);
-	Error error;
 
 	/* get the command name (first word on the line) */
 	/* we have to set current_command because Response::Error()

src/decoder/DecoderControl.cxx

@@ -22,7 +22,8 @@
 #include "DecoderError.hxx"
 #include "MusicPipe.hxx"
 #include "DetachedSong.hxx"
-#include "util/Error.hxx"
+
+#include <stdexcept>
 
 #include <assert.h>
 
@@ -104,8 +105,8 @@ DecoderControl::Stop()
 		SynchronousCommandLocked(DecoderCommand::STOP);
 }
 
-bool
-DecoderControl::Seek(SongTime t, Error &error_r)
+void
+DecoderControl::Seek(SongTime t)
 {
 	assert(state != DecoderState::START);
 	assert(state != DecoderState::ERROR);
@@ -118,28 +119,21 @@ DecoderControl::Seek(SongTime t, Error &error_r)
 	case DecoderState::STOP:
 		/* TODO: if this happens, the caller should be given a
 		   chance to restart the decoder */
-		error_r.Set(decoder_domain, "Decoder is dead");
-		return false;
+		throw std::runtime_error("Decoder is dead");
 
 	case DecoderState::DECODE:
 		break;
 	}
 
-	if (!seekable) {
-		error_r.Set(decoder_domain, "Not seekable");
-		return false;
-	}
+	if (!seekable)
+		throw std::runtime_error("Not seekable");
 
 	seek_time = t;
 	seek_error = false;
 	LockSynchronousCommand(DecoderCommand::SEEK);
 
-	if (seek_error) {
-		error_r.Set(decoder_domain, "Decoder failed to seek");
-		return false;
-	}
-
-	return true;
+	if (seek_error)
+		throw std::runtime_error("Decoder failed to seek");
 }
 
 void

src/decoder/DecoderControl.hxx

@@ -40,7 +40,6 @@
 #undef ERROR
 #endif
 
-class Error;
 class DetachedSong;
 class MusicBuffer;
 class MusicPipe;
@@ -367,7 +366,10 @@ public:
 
 	void Stop();
 
-	bool Seek(SongTime t, Error &error_r);
+	/**
+	 * Throws #std::runtime_error on error.
+	 */
+	void Seek(SongTime t);
 
 	void Quit();
 

src/player/Thread.cxx

@@ -618,10 +618,12 @@ Player::SeekDecoder()
 				where = total_time;
 		}
 
-		Error error;
-		if (!dc.Seek(where + start_time, error)) {
+		try {
+			dc.Seek(where + start_time);
+		} catch (...) {
 			/* decoder failure */
-			pc.SetError(PlayerError::DECODER, std::move(error));
+			pc.SetError(PlayerError::DECODER,
+				    std::current_exception());
 			pc.LockCommandFinished();
 			return false;
 		}