128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/*
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* pipe output driver. This file is part of Shairport.
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* Copyright (c) James Laird 2013
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <memory.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "common.h"
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#include "audio.h"
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static int fd = -1;
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char *pipename = NULL;
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static void start(int sample_rate) {
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debug(1, "Pipename to start is \"%s\"", pipename);
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if (strcasecmp(pipename, "STDOUT") == 0)
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fd = STDOUT_FILENO;
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else
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fd = open(pipename, O_WRONLY);
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}
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static void play(short buf[], int samples) { int ignore = write(fd, buf, samples * 4); }
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static void stop(void) {
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if (fd != STDOUT_FILENO)
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close(fd);
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}
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static int init(int argc, char **argv) {
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const char *str;
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int value;
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config.audio_backend_buffer_desired_length = 44100; // one second.
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config.audio_backend_latency_offset = 0;
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if (config.cfg != NULL) {
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/* Get the Output Pipename. */
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const char *str;
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if (config_lookup_string(config.cfg, "pipe.name", &str)) {
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pipename = (char *)str;
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}
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/* Get the desired buffer size setting. */
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if (config_lookup_int(config.cfg, "pipe.audio_backend_buffer_desired_length", &value)) {
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if ((value < 0) || (value > 132300))
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die("Invalid pipe audio backend buffer desired length \"%d\". It should be between 0 and 132300, default is 44100",
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value);
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else
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config.audio_backend_buffer_desired_length = value;
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}
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/* Get the latency offset. */
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if (config_lookup_int(config.cfg, "pipe.audio_backend_latency_offset", &value)) {
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if ((value < -66150) || (value > 66150))
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die("Invalid pipe audio backend buffer latency offset \"%d\". It should be between -66150 and +66150, default is 0",
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value);
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else
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config.audio_backend_latency_offset = value;
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}
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}
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if ((pipename == NULL) && (argc != 1))
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die("bad or missing argument(s) to pipe");
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if (argc == 1)
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pipename = strdup(argv[0]);
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// here, create the pipe
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if (strcasecmp(pipename, "STDOUT") != 0)
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if (mkfifo(pipename, 0644) && errno != EEXIST)
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die("Could not create output pipe \"%s\"", pipename);
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debug(1, "Pipename is \"%s\"", pipename);
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// test open pipe so we error on startup if it's going to fail
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start(44100);
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stop();
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return 0;
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}
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static void deinit(void) {
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if ((fd > 0) && (fd != STDOUT_FILENO))
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close(fd);
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}
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static void help(void) {
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printf(" pipe takes 1 argument: the name of the FIFO to write to.\n");
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}
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audio_output audio_pipe = {.name = "pipe",
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.help = &help,
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.init = &init,
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.deinit = &deinit,
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.start = &start,
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.stop = &stop,
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.flush = NULL,
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.delay = NULL,
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.play = &play,
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.volume = NULL,
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.parameters = NULL};
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