2007-06-13 16:15:30 +02:00
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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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2008-09-07 22:41:17 +02:00
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#include "../output_api.h"
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2007-06-13 16:15:30 +02:00
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#include "../log.h"
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#include "../utils.h"
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#include "../timer.h"
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2008-10-08 10:49:29 +02:00
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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2007-06-13 16:15:30 +02:00
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#define FIFO_BUFFER_SIZE 65536 /* pipe capacity on Linux >= 2.6.11 */
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typedef struct _FifoData {
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char *path;
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int input;
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int output;
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int created;
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Timer *timer;
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} FifoData;
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2008-01-26 13:46:09 +01:00
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static FifoData *newFifoData(void)
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2007-06-13 16:15:30 +02:00
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{
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FifoData *ret;
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ret = xmalloc(sizeof(FifoData));
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ret->path = NULL;
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ret->input = -1;
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ret->output = -1;
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ret->created = 0;
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ret->timer = NULL;
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return ret;
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}
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static void freeFifoData(FifoData *fd)
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{
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if (fd->path)
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free(fd->path);
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if (fd->timer)
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timer_free(fd->timer);
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free(fd);
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}
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static void removeFifo(FifoData *fd)
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{
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DEBUG("Removing FIFO \"%s\"\n", fd->path);
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if (unlink(fd->path) < 0) {
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ERROR("Could not remove FIFO \"%s\": %s\n",
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fd->path, strerror(errno));
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return;
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}
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fd->created = 0;
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}
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static void closeFifo(FifoData *fd)
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{
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struct stat st;
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if (fd->input >= 0) {
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close(fd->input);
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fd->input = -1;
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}
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if (fd->output >= 0) {
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close(fd->output);
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fd->output = -1;
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}
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if (fd->created && (stat(fd->path, &st) == 0))
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removeFifo(fd);
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}
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static int makeFifo(FifoData *fd)
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{
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if (mkfifo(fd->path, 0666) < 0) {
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ERROR("Couldn't create FIFO \"%s\": %s\n",
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fd->path, strerror(errno));
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return -1;
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}
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fd->created = 1;
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return 0;
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}
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static int checkFifo(FifoData *fd)
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{
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struct stat st;
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if (stat(fd->path, &st) < 0) {
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if (errno == ENOENT) {
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/* Path doesn't exist */
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return makeFifo(fd);
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}
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ERROR("Failed to stat FIFO \"%s\": %s\n",
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fd->path, strerror(errno));
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return -1;
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}
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if (!S_ISFIFO(st.st_mode)) {
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ERROR("\"%s\" already exists, but is not a FIFO\n", fd->path);
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return -1;
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}
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return 0;
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}
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static int openFifo(FifoData *fd)
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{
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if (checkFifo(fd) < 0)
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return -1;
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fd->input = open(fd->path, O_RDONLY|O_NONBLOCK);
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if (fd->input < 0) {
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ERROR("Could not open FIFO \"%s\" for reading: %s\n",
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fd->path, strerror(errno));
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closeFifo(fd);
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return -1;
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}
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fd->output = open(fd->path, O_WRONLY|O_NONBLOCK);
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if (fd->output < 0) {
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ERROR("Could not open FIFO \"%s\" for writing: %s\n",
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fd->path, strerror(errno));
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closeFifo(fd);
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return -1;
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}
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return 0;
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}
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2008-09-24 07:20:55 +02:00
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static void *fifo_initDriver(mpd_unused struct audio_output *ao,
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mpd_unused const struct audio_format *audio_format,
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ConfigParam *param)
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2007-06-13 16:15:30 +02:00
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{
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FifoData *fd;
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2007-06-13 17:37:46 +02:00
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BlockParam *blockParam;
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char *path;
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2007-06-13 16:15:30 +02:00
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2007-06-13 17:37:46 +02:00
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blockParam = getBlockParam(param, "path");
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if (!blockParam) {
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2007-06-13 16:15:30 +02:00
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FATAL("No \"path\" parameter specified for fifo output "
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"defined at line %i\n", param->line);
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}
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2007-06-13 17:37:46 +02:00
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path = parsePath(blockParam->value);
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if (!path) {
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FATAL("Could not parse \"path\" parameter for fifo output "
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"at line %i\n", blockParam->line);
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2007-06-13 16:15:30 +02:00
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}
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fd = newFifoData();
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2007-06-13 17:37:46 +02:00
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fd->path = path;
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2007-06-13 16:15:30 +02:00
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if (openFifo(fd) < 0) {
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freeFifoData(fd);
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2008-09-24 07:20:55 +02:00
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return NULL;
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2007-06-13 16:15:30 +02:00
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}
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2008-09-24 07:20:55 +02:00
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return fd;
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2007-06-13 16:15:30 +02:00
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}
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2008-09-24 07:20:55 +02:00
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static void fifo_finishDriver(void *data)
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2007-06-13 16:15:30 +02:00
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{
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2008-09-24 07:20:55 +02:00
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FifoData *fd = (FifoData *)data;
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2007-06-13 16:15:30 +02:00
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closeFifo(fd);
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freeFifoData(fd);
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}
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2008-09-24 07:20:55 +02:00
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static int fifo_openDevice(void *data,
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2008-09-24 07:20:36 +02:00
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struct audio_format *audio_format)
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2007-06-13 16:15:30 +02:00
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{
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2008-09-24 07:20:55 +02:00
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FifoData *fd = (FifoData *)data;
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2007-06-13 16:15:30 +02:00
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if (fd->timer)
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timer_free(fd->timer);
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2008-09-24 07:20:36 +02:00
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fd->timer = timer_new(audio_format);
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2007-06-13 16:15:30 +02:00
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return 0;
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}
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2008-09-24 07:20:55 +02:00
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static void fifo_closeDevice(void *data)
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2007-06-13 16:15:30 +02:00
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{
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2008-09-24 07:20:55 +02:00
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FifoData *fd = (FifoData *)data;
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2007-06-13 16:15:30 +02:00
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if (fd->timer) {
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timer_free(fd->timer);
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fd->timer = NULL;
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}
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}
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2008-09-24 07:20:55 +02:00
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static void fifo_dropBufferedAudio(void *data)
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2007-06-13 16:15:30 +02:00
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{
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2008-09-24 07:20:55 +02:00
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FifoData *fd = (FifoData *)data;
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2007-06-13 16:15:30 +02:00
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char buf[FIFO_BUFFER_SIZE];
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int bytes = 1;
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timer_reset(fd->timer);
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while (bytes > 0 && errno != EINTR)
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bytes = read(fd->input, buf, FIFO_BUFFER_SIZE);
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if (bytes < 0 && errno != EAGAIN) {
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WARNING("Flush of FIFO \"%s\" failed: %s\n",
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fd->path, strerror(errno));
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}
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}
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2008-09-24 07:20:55 +02:00
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static int fifo_playAudio(void *data,
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2008-04-12 06:15:52 +02:00
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const char *playChunk, size_t size)
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2007-06-13 16:15:30 +02:00
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{
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2008-09-24 07:20:55 +02:00
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FifoData *fd = (FifoData *)data;
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2008-04-12 06:15:52 +02:00
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size_t offset = 0;
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ssize_t bytes;
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2007-06-13 16:15:30 +02:00
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if (!fd->timer->started)
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timer_start(fd->timer);
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else
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timer_sync(fd->timer);
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timer_add(fd->timer, size);
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while (size) {
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bytes = write(fd->output, playChunk + offset, size);
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if (bytes < 0) {
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switch (errno) {
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case EAGAIN:
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/* The pipe is full, so empty it */
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2008-09-24 07:20:55 +02:00
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fifo_dropBufferedAudio(fd);
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2007-06-13 16:15:30 +02:00
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continue;
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case EINTR:
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continue;
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}
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ERROR("Closing FIFO output \"%s\" due to write error: "
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"%s\n", fd->path, strerror(errno));
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2008-09-24 07:20:55 +02:00
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fifo_closeDevice(fd);
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2007-06-13 16:15:30 +02:00
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return -1;
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}
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size -= bytes;
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offset += bytes;
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}
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return 0;
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}
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2008-09-08 11:43:38 +02:00
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const struct audio_output_plugin fifoPlugin = {
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2008-09-29 15:55:17 +02:00
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.name = "fifo",
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.init = fifo_initDriver,
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.finish = fifo_finishDriver,
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.open = fifo_openDevice,
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.play = fifo_playAudio,
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.cancel = fifo_dropBufferedAudio,
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.close = fifo_closeDevice,
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2007-06-13 16:15:30 +02:00
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};
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