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/* the Music Player Daemon (MPD)
* (c)2003-2006 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>
#ifdef HAVE_FIFO
#include "../conf.h"
#include "../log.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#define FIFO_BUFFER_SIZE 65536 /* pipe capacity on Linux >= 2.6.11 */
typedef struct _FifoData {
char *path;
int input;
int output;
int created;
} FifoData;
static FifoData *newFifoData()
{
FifoData *ret;
ret = malloc(sizeof(FifoData));
ret->path = NULL;
ret->input = -1;
ret->output = -1;
ret->created = 0;
return ret;
}
static void freeFifoData(FifoData *fd)
{
if (fd->path) free(fd->path);
free(fd);
}
static int makeFifo(FifoData *fd)
{
if (mkfifo(fd->path, 0666) < 0) {
ERROR("Couldn't create FIFO \"%s\": %s\n", fd->path,
strerror(errno));
return -1;
}
fd->created = 1;
return 0;
}
static int checkFifo(FifoData *fd)
{
struct stat info;
if (stat(fd->path, &info) < 0) {
if (errno == ENOENT) {
/* Path doesn't exist */
return makeFifo(fd);
}
ERROR("Failed to stat FIFO \"%s\": %s\n", fd->path,
strerror(errno));
return -1;
}
if (!S_ISFIFO(info.st_mode)) {
ERROR("\"%s\" already exists, but is not a FIFO\n", fd->path);
return -1;
}
return 0;
}
static int openFifo(FifoData *fd)
{
if (checkFifo(fd) < 0) return -1;
fd->input = open(fd->path, O_RDONLY|O_NONBLOCK);
if (fd->input < 0) {
ERROR("Could not open FIFO \"%s\" for reading: %s\n", fd->path,
strerror(errno));
return -1;
}
fd->output = open(fd->path, O_WRONLY|O_NONBLOCK);
if (fd->output < 0) {
ERROR("Could not open FIFO \"%s\" for writing: %s\n", fd->path,
strerror(errno));
return -1;
}
return 0;
}
static void removeFifo(FifoData *fd)
{
DEBUG("Removing FIFO \"%s\"\n", fd->path);
if (unlink(fd->path) < 0) {
ERROR("Could not remove FIFO \"%s\": %s\n", fd->path,
strerror(errno));
return;
}
fd->created = 0;
}
static void closeFifo(FifoData *fd)
{
struct stat info;
if (fd->input >= 0) close(fd->input);
if (fd->output >= 0) close(fd->output);
if (fd->created && (stat(fd->path, &info) == 0)) removeFifo(fd);
}
static int fifo_initDriver(AudioOutput *audioOutput, ConfigParam *param)
{
BlockParam *path = NULL;
FifoData *fd;
if (param) path = getBlockParam(param, "path");
if (!path) {
ERROR("No \"path\" parameter specified for fifo output "
"defined at line %i\n", param->line);
exit(EXIT_FAILURE);
}
if (path->value[0] != '/') {
ERROR("\"path\" parameter for fifo output is not an absolute "
"path at line %i\n", param->line);
exit(EXIT_FAILURE);
}
fd = newFifoData();
fd->path = strdup(path->value);
audioOutput->data = fd;
if (openFifo(fd) < 0) {
freeFifoData(fd);
return -1;
}
return 0;
}
static void fifo_finishDriver(AudioOutput *audioOutput)
{
FifoData *fd;
fd = audioOutput->data;
closeFifo(fd);
freeFifoData(fd);
}
static int fifo_openDevice(AudioOutput *audioOutput)
{
audioOutput->open = 1;
return 0;
}
static void fifo_dropBufferedAudio(AudioOutput *audioOutput)
{
FifoData *fd;
char buf[FIFO_BUFFER_SIZE];
int bytes = 1;
fd = audioOutput->data;
while (bytes > 0) bytes = read(fd->input, buf, FIFO_BUFFER_SIZE);
if (bytes < 0 && errno != EAGAIN) {
WARNING("Flush of FIFO \"%s\" failed: %s\n", fd->path,
strerror(errno));
}
}
static void fifo_closeDevice(AudioOutput *audioOutput)
{
audioOutput->open = 0;
}
static int fifo_playAudio(AudioOutput *audioOutput, char *playChunk, int size)
{
FifoData *fd;
int bytes;
int offset = 0;
fd = audioOutput->data;
while (1) {
bytes = write(fd->output, &playChunk[offset], size);
if (bytes < 0 && errno == EAGAIN) {
fifo_dropBufferedAudio(audioOutput);
} else if (bytes < 0) {
ERROR("Closing FIFO output \"%s\" due to write error: "
"%s\n", fd->path, strerror(errno));
fifo_closeDevice(audioOutput);
return -1;
} else if (bytes < size) {
size -= bytes;
offset += bytes;
} else {
break;
}
}
return 0;
}
AudioOutputPlugin fifoPlugin = {
"fifo",
NULL, /* testDefaultDeviceFunc */
fifo_initDriver,
fifo_finishDriver,
fifo_openDevice,
fifo_playAudio,
fifo_dropBufferedAudio,
fifo_closeDevice,
NULL, /* sendMetadataFunc */
};
#else /* HAVE_FIFO */
DISABLED_AUDIO_OUTPUT_PLUGIN(fifoPlugin)
#endif /* HAVE_FIFO */
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