decoder/Client: add DecoderCommand/seek virtual methods

test/FakeDecoderAPI.cxx

@@ -46,30 +46,30 @@ FakeDecoder::Ready(const AudioFormat audio_format,
 }
 
 DecoderCommand
-decoder_get_command(gcc_unused DecoderClient &client)
+FakeDecoder::GetCommand()
 {
 	return DecoderCommand::NONE;
 }
 
 void
-decoder_command_finished(gcc_unused DecoderClient &client)
+FakeDecoder::CommandFinished()
 {
 }
 
 SongTime
-decoder_seek_time(gcc_unused DecoderClient &client)
+FakeDecoder::GetSeekTime()
 {
 	return SongTime();
 }
 
 uint64_t
-decoder_seek_where_frame(gcc_unused DecoderClient &client)
+FakeDecoder::GetSeekFrame()
 {
 	return 1;
 }
 
 void
-decoder_seek_error(gcc_unused DecoderClient &client)
+FakeDecoder::SeekError()
 {
 }
 

test/FakeDecoderAPI.hxx

@@ -34,6 +34,11 @@ struct FakeDecoder final : DecoderClient {
 	/* virtual methods from DecoderClient */
 	void Ready(AudioFormat audio_format,
 		   bool seekable, SignedSongTime duration) override;
+	DecoderCommand GetCommand() override;
+	void CommandFinished() override;
+	SongTime GetSeekTime() override;
+	uint64_t GetSeekFrame() override;
+	void SeekError() override;
 };
 
 #endif