Adding a null output plugin.

configure.ac

@@ -115,6 +115,8 @@ AC_CHECK_SIZEOF(long long)
 
 AC_CHECK_HEADER(sys/inttypes.h,AC_DEFINE(HAVE_SYS_INTTYPES_H,1,[Define if sys/inttypes.h present]),)
 
+AC_TYPE_UINT64_T
+
 AC_CHECK_LIB(socket,socket,MPD_LIBS="$MPD_LIBS -lsocket",)
 AC_CHECK_LIB(nsl,gethostbyname,MPD_LIBS="$MPD_LIBS -lnsl",)
 

src/Makefile.am

@@ -2,6 +2,7 @@ bin_PROGRAMS = mpd
 SUBDIRS = $(MP4FF_SUBDIR)
 
 mpd_audioOutputs = \
+	audioOutputs/audioOutput_null.c \
 	audioOutputs/audioOutput_alsa.c \
 	audioOutputs/audioOutput_ao.c \
 	audioOutputs/audioOutput_oss.c \

src/audio.c

@@ -92,6 +92,7 @@ int cmpAudioFormat(AudioFormat * f1, AudioFormat * f2)
 void loadAudioDrivers(void)
 {
 	initAudioOutputPlugins();
+	loadAudioOutputPlugin(&nullPlugin);
 	loadAudioOutputPlugin(&alsaPlugin);
 	loadAudioOutputPlugin(&aoPlugin);
 	loadAudioOutputPlugin(&ossPlugin);

src/audioOutput.h

@@ -105,6 +105,7 @@ void sendMetadataToAudioOutput(AudioOutput * audioOutput, MpdTag * tag);
 
 void printAllOutputPluginTypes(FILE * fp);
 
+extern AudioOutputPlugin nullPlugin;
 extern AudioOutputPlugin alsaPlugin;
 extern AudioOutputPlugin aoPlugin;
 extern AudioOutputPlugin ossPlugin;

src/audioOutputs/audioOutput_null.c

+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * 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 "../audioOutput.h"
+
+#include <stdlib.h>
+#include <limits.h>
+#include <sys/time.h>
+
+typedef struct _NullData {
+	uint64_t nextPlay;
+	int rate;
+} NullData;
+
+static NullData *newNullData(void)
+{
+	NullData *ret;
+
+	ret = xmalloc(sizeof(NullData));
+	ret->nextPlay = 0;
+	ret->rate = 0;
+
+	return ret;
+}
+
+static void freeNullData(NullData *nd)
+{
+	free(nd);
+}
+
+static uint64_t null_getTime(void)
+{
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+
+	return ((uint64_t)tv.tv_sec * 1000000) + tv.tv_usec;
+}
+
+static int null_initDriver(AudioOutput *audioOutput, ConfigParam *param)
+{
+	NullData *nd;
+
+	nd = newNullData();
+	audioOutput->data = nd;
+
+	return 0;
+}
+
+static void null_finishDriver(AudioOutput *audioOutput)
+{
+	freeNullData((NullData *)audioOutput->data);
+}
+
+static int null_openDevice(AudioOutput *audioOutput)
+{
+	NullData *nd;
+	AudioFormat *af;
+
+	nd = audioOutput->data;
+	af = &audioOutput->outAudioFormat;
+	nd->rate = af->sampleRate * (af->bits / CHAR_BIT) * af->channels;
+	audioOutput->open = 1;
+
+	return 0;
+}
+
+static void null_dropBufferedAudio(AudioOutput *audioOutput)
+{
+	NullData *nd;
+
+	nd = audioOutput->data;
+	nd->nextPlay = 0;
+}
+
+static void null_closeDevice(AudioOutput *audioOutput)
+{
+	NullData *nd;
+
+	nd = audioOutput->data;
+	nd->nextPlay = 0;
+	nd->rate = 0;
+	audioOutput->open = 0;
+}
+
+static int null_playAudio(AudioOutput *audioOutput, char *playChunk, int size)
+{
+	NullData *nd;
+	uint64_t now;
+
+	nd = audioOutput->data;
+	now = null_getTime();
+
+	if (nd->nextPlay == 0)
+		nd->nextPlay = now;
+	else if (nd->nextPlay > now)
+		my_usleep(nd->nextPlay - now);
+
+	nd->nextPlay += ((uint64_t)size * 1000000) / nd->rate;
+
+	return 0;
+}
+
+AudioOutputPlugin nullPlugin = {
+	"null",
+	NULL,
+	null_initDriver,
+	null_finishDriver,
+	null_openDevice,
+	null_playAudio,
+	null_dropBufferedAudio,
+	null_closeDevice,
+	NULL,
+};

src/mpd_types.h

@@ -21,6 +21,16 @@
 
 #include "../config.h"
 
+#if defined(HAVE_STDINT_H)
+#include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+#include <inttypes.h>
+#elif defined(HAVE_SYS_INTTYPES_H)
+#include <sys/inttypes.h>
+#elif defined(HAVE_SYS_TYPES_H)
+#include <sys/types.h>
+#endif
+
 typedef unsigned char mpd_uint8;
 typedef signed char mpd_sint8;