merged start, stop, seek into DecoderControl.command

Much of the existing code queries all three variables sequentially.
Since only one of them can be set at a time, this can be optimized and
unified by merging all of them into one enum variable.  Later, the
"command" checks can be expressed in a "switch" statement.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/decode.h b/src/decode.h
index 990f5e57a..9418c8789 100644
--- a/src/decode.h
+++ b/src/decode.h
@@ -33,6 +33,13 @@ enum decoder_state {
 	DECODE_STATE_DECODE
 };
 
+enum decoder_command {
+	DECODE_COMMAND_NONE = 0,
+	DECODE_COMMAND_START,
+	DECODE_COMMAND_STOP,
+	DECODE_COMMAND_SEEK
+};
+
 #define DECODE_ERROR_NOERROR	0
 #define DECODE_ERROR_UNKTYPE	10
 #define DECODE_ERROR_FILE	20
@@ -41,10 +48,8 @@ typedef struct _DecoderControl {
 	Notify notify;
 
 	volatile enum decoder_state state;
-	volatile mpd_sint8 stop;
-	volatile mpd_sint8 start;
+	volatile enum decoder_command command;
 	volatile mpd_uint16 error;
-	volatile mpd_sint8 seek;
 	volatile mpd_sint8 seekError;
 	volatile mpd_sint8 seekable;
 	volatile double seekWhere;