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authorJ. Alexander Treuman <jat@spatialrift.net>2007-05-30 16:52:56 +0000
committerJ. Alexander Treuman <jat@spatialrift.net>2007-05-30 16:52:56 +0000
commit0f8ab01c3eb4d540379bc5f28fe0255d9537e938 (patch)
tree2e8aa2b49d908dc9c35ff397e1c897ea106d2231 /src/audioOutputs/audioOutput_null.c
parent4155cd9940dfb629287252b3c2f88c126d868edd (diff)
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Adding a null output plugin.
git-svn-id: https://svn.musicpd.org/mpd/trunk@6393 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src/audioOutputs/audioOutput_null.c')
-rw-r--r--src/audioOutputs/audioOutput_null.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/audioOutputs/audioOutput_null.c b/src/audioOutputs/audioOutput_null.c
new file mode 100644
index 000000000..df58c7139
--- /dev/null
+++ b/src/audioOutputs/audioOutput_null.c
@@ -0,0 +1,129 @@
+/* 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,
+};