130 lines
2.6 KiB
C
130 lines
2.6 KiB
C
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/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "../audioOutput.h"
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#include <stdlib.h>
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#include <limits.h>
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#include <sys/time.h>
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typedef struct _NullData {
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uint64_t nextPlay;
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int rate;
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} NullData;
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static NullData *newNullData(void)
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{
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NullData *ret;
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ret = xmalloc(sizeof(NullData));
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ret->nextPlay = 0;
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ret->rate = 0;
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return ret;
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}
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static void freeNullData(NullData *nd)
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{
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free(nd);
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}
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static uint64_t null_getTime(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return ((uint64_t)tv.tv_sec * 1000000) + tv.tv_usec;
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}
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static int null_initDriver(AudioOutput *audioOutput, ConfigParam *param)
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{
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NullData *nd;
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nd = newNullData();
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audioOutput->data = nd;
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return 0;
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}
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static void null_finishDriver(AudioOutput *audioOutput)
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{
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freeNullData((NullData *)audioOutput->data);
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}
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static int null_openDevice(AudioOutput *audioOutput)
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{
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NullData *nd;
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AudioFormat *af;
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nd = audioOutput->data;
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af = &audioOutput->outAudioFormat;
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nd->rate = af->sampleRate * (af->bits / CHAR_BIT) * af->channels;
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audioOutput->open = 1;
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return 0;
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}
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static void null_dropBufferedAudio(AudioOutput *audioOutput)
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{
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NullData *nd;
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nd = audioOutput->data;
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nd->nextPlay = 0;
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}
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static void null_closeDevice(AudioOutput *audioOutput)
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{
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NullData *nd;
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nd = audioOutput->data;
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nd->nextPlay = 0;
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nd->rate = 0;
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audioOutput->open = 0;
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}
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static int null_playAudio(AudioOutput *audioOutput, char *playChunk, int size)
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{
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NullData *nd;
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uint64_t now;
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nd = audioOutput->data;
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now = null_getTime();
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if (nd->nextPlay == 0)
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nd->nextPlay = now;
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else if (nd->nextPlay > now)
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my_usleep(nd->nextPlay - now);
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nd->nextPlay += ((uint64_t)size * 1000000) / nd->rate;
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return 0;
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}
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AudioOutputPlugin nullPlugin = {
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"null",
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NULL,
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null_initDriver,
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null_finishDriver,
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null_openDevice,
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null_playAudio,
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null_dropBufferedAudio,
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null_closeDevice,
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NULL,
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};
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