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/*
* pipe output driver. This file is part of Shairport.
* Copyright (c) James Laird 2013
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <memory.h>
#include <stdlib.h>
#include <errno.h>
#include "common.h"
#include "audio.h"
static int fd = -1;
char *pipename = NULL;
static void start(int sample_rate) {
debug(1,"Pipename to start is \"%s\"",pipename);
if (strcasecmp(pipename,"STDOUT")==0)
fd = STDOUT_FILENO;
else
fd = open(pipename, O_WRONLY);
}
static void play(short buf[], int samples) {
int ignore = write(fd, buf, samples*4);
}
static void stop(void) {
if (fd!=STDOUT_FILENO)
close(fd);
}
static int init(int argc, char **argv) {
config.audio_backend_buffer_desired_length = 44100; // one second.
config.audio_backend_latency_offset = 0;
if (config.cfg!=NULL) {
/* Get the Output Pipename. */
const char *str;
if(config_lookup_string(config.cfg, "pipe.name", &str)) {
pipename = (char*)str;
}
}
if ((pipename==NULL) && (argc != 1))
die("bad or missing argument(s) to pipe");
if (argc==1)
pipename = strdup(argv[0]);
// here, create the pipe
if (strcasecmp(pipename,"STDOUT")!=0)
if (mkfifo(pipename, 0644) && errno != EEXIST)
die("Could not create metadata FIFO %s", pipename);
debug(1,"Pipename is \"%s\"",pipename);
// test open pipe so we error on startup if it's going to fail
start(44100);
stop();
return 0;
}
static void deinit(void) {
if ((fd > 0) && (fd!=STDOUT_FILENO))
close(fd);
}
static void help(void) {
printf(" pipe takes 1 argument: the name of the FIFO to write to, which can be \"stdout\".\n");
}
audio_output audio_pipe = {
.name = "pipe",
.help = &help,
.init = &init,
.deinit = &deinit,
.start = &start,
.stop = &stop,
.flush = NULL,
.delay = NULL,
.play = &play,
.volume = NULL,
.parameters = NULL
};
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