eliminate OUTPUT_BUFFER_DC_STOP, OUTPUT_BUFFER_DC_SEEK

(Ab)use the decoder_command enumeration, which has nearly the same
values and the same meaning.

src/decoder_api.c

@@ -82,15 +82,15 @@ void decoder_seek_error(struct decoder * decoder)
  * All chunks are full of decoded data; wait for the player to free
  * one.
  */
-static int need_chunks(struct decoder *decoder, InputStream * inStream,
-		       int seekable)
+static enum decoder_command
+need_chunks(struct decoder *decoder, InputStream * inStream, int seekable)
 {
 	if (dc.command == DECODE_COMMAND_STOP)
-		return OUTPUT_BUFFER_DC_STOP;
+		return DECODE_COMMAND_STOP;
 
 	if (dc.command == DECODE_COMMAND_SEEK) {
 		if (seekable) {
-			return OUTPUT_BUFFER_DC_SEEK;
+			return DECODE_COMMAND_SEEK;
 		} else {
 			decoder_seek_error(decoder);
 		}
@@ -102,14 +102,14 @@ static int need_chunks(struct decoder *decoder, InputStream * inStream,
 		notify_signal(&pc.notify);
 	}
 
-	return 0;
+	return DECODE_COMMAND_NONE;
 }
 
-int decoder_data(struct decoder *decoder, InputStream * inStream,
-		 int seekable,
-		 void *dataIn, size_t dataInLen,
-		 float data_time, mpd_uint16 bitRate,
-		 ReplayGainInfo * replayGainInfo)
+enum decoder_command
+decoder_data(struct decoder *decoder, InputStream * inStream, int seekable,
+	     void *dataIn, size_t dataInLen,
+	     float data_time, mpd_uint16 bitRate,
+	     ReplayGainInfo * replayGainInfo)
 {
 	size_t nbytes;
 	char *data;
@@ -153,7 +153,7 @@ int decoder_data(struct decoder *decoder, InputStream * inStream,
 		}
 	}
 
-	return 0;
+	return DECODE_COMMAND_NONE;
 }
 
 void decoder_flush(mpd_unused struct decoder *decoder)

src/decoder_api.h

@@ -125,11 +125,10 @@ void decoder_seek_error(struct decoder * decoder);
  * We send inStream for buffering the inputStream while waiting to
  * send the next chunk
  */
-int decoder_data(struct decoder *decoder, InputStream * inStream,
-		 int seekable,
-		 void *data, size_t datalen,
-		 float data_time, mpd_uint16 bitRate,
-		 ReplayGainInfo * replayGainInfo);
+enum decoder_command
+decoder_data(struct decoder *decoder, InputStream * inStream, int seekable,
+	     void *data, size_t datalen, float data_time, mpd_uint16 bitRate,
+	     ReplayGainInfo * replayGainInfo);
 
 void decoder_flush(struct decoder *decoder);
 

src/inputPlugins/_flac_common.h

@@ -171,7 +171,7 @@ static inline int flacSendChunk(FlacData * data)
 			 1, data->chunk,
 			 data->chunk_length, data->time,
 			 data->bitRate,
-			 data->replayGainInfo) == OUTPUT_BUFFER_DC_STOP)
+			 data->replayGainInfo) == DECODE_COMMAND_STOP)
 		return -1;
 
 	return 0;

src/inputPlugins/mp3_plugin.c

@@ -927,21 +927,22 @@ static int mp3Read(mp3DecodeData * data, struct decoder *decoder,
 			}
 
 			if (data->outputPtr >= data->outputBufferEnd) {
-				ret = decoder_data(decoder, data->inStream,
+				enum decoder_command cmd;
+				cmd = decoder_data(decoder, data->inStream,
 						   data->inStream->seekable,
 						   data->outputBuffer,
 						   data->outputPtr - data->outputBuffer,
 						   data->elapsedTime,
 						   data->bitRate / 1000,
 						   (replayGainInfo != NULL) ? *replayGainInfo : NULL);
-				if (ret == OUTPUT_BUFFER_DC_STOP) {
+				if (cmd == DECODE_COMMAND_STOP) {
 					data->flush = 0;
 					return DECODE_BREAK;
 				}
 
 				data->outputPtr = data->outputBuffer;
 
-				if (ret == OUTPUT_BUFFER_DC_SEEK)
+				if (cmd == DECODE_COMMAND_STOP)
 					break;
 			}
 		}

src/outputBuffer.h

@@ -22,9 +22,6 @@
 #include "notify.h"
 #include "audio_format.h"
 
-#define OUTPUT_BUFFER_DC_STOP   -1
-#define OUTPUT_BUFFER_DC_SEEK   -2
-
 /* pick 1020 since its devisible for 8,16,24, and 32-bit audio */
 #define CHUNK_SIZE		1020