some begging code of abstracting out some simple buffer routine(s) for decoders

src/outputBuffer.c

+/* the Music Player Daemon (MPD)
+ * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "outputBuffer.h"
+
+#include "pcm_utils.h"
+#include "playerData.h"
+#include "log.h"
+#include "utils.h"
+
+#include <string.h>
+#include <errno.h>
+
+#define OUTPUT_BUFFER_DC_STOP   -1
+#define OUTPUT_BUFFER_DC_SEEK   -2
+
+long sendDataToOutputBuffer(Buffer * cb, DecoderControl * dc, int flushAllData,
+                char * data, long datalen, float time, mpd_uint16 bitRate)
+{
+        long dataSent = 0;
+        long dataToSend;
+
+        while(datalen >= CHUNK_SIZE || (flushAllData && datalen)) {
+                dataToSend = datalen > CHUNK_SIZE ? CHUNK_SIZE : datalen;
+
+	        while(cb->begin==cb->end && cb->wrap && !dc->stop && !dc->seek) 
+		        my_usleep(10000);
+	        if(dc->stop) return OUTPUT_BUFFER_DC_STOP;
+	        /* just for now, so it doesn't hang */
+	        if(dc->seek) return OUTPUT_BUFFER_DC_SEEK;
+	        /* be sure to remove this! */
+
+	        memcpy(cb->chunks+cb->end*CHUNK_SIZE,data,dataToSend);
+	        cb->chunkSize[cb->end] = dataToSend;
+	        cb->bitRate[cb->end] = bitRate;
+	        cb->times[cb->end] = time;
+
+	        cb->end++;
+	        if(cb->end>=buffered_chunks) {
+		        cb->end = 0;
+		        cb->wrap = 1;
+	        }
+
+                datalen-= dataToSend;
+                dataSent+= dataToSend;
+                data+= dataToSend;
+        }
+
+	return dataSent;
+}
+/* vim:set shiftwidth=4 tabstop=8 expandtab: */