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/* 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,
};
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