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-rw-r--r--src/audioOutputs/audioOutput_fifo.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/src/audioOutputs/audioOutput_fifo.c b/src/audioOutputs/audioOutput_fifo.c
new file mode 100644
index 000000000..58bf2c265
--- /dev/null
+++ b/src/audioOutputs/audioOutput_fifo.c
@@ -0,0 +1,251 @@
+/* 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 */