163 lines
5.4 KiB
C
163 lines
5.4 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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* Modifications for audio synchronisation
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* and related work, copyright (c) Mike Brady 2014
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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 "audio.h"
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#include "common.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <memory.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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static int fd = -1;
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char *pipename = NULL;
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char *default_pipe_name = "/tmp/shairport-sync-audio";
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static void start(__attribute__((unused)) int sample_rate,
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__attribute__((unused)) int sample_format) {
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// this will leave fd as -1 if a reader hasn't been attached to the pipe
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// we check that it's not a "real" error though. From the "man 2 open" page:
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// "ENXIO O_NONBLOCK | O_WRONLY is set, the named file is a FIFO, and no process has the FIFO
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// open for reading."
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fd = try_to_open_pipe_for_writing(pipename);
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// we check that it's not a "real" error. From the "man 2 open" page:
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// "ENXIO O_NONBLOCK | O_WRONLY is set, the named file is a FIFO, and no process has the FIFO
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// open for reading." Which is okay.
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if ((fd == -1) && (errno != ENXIO)) {
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char errorstring[1024];
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strerror_r(errno, (char *)errorstring, sizeof(errorstring));
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debug(1, "audio_pipe start -- error %d (\"%s\") opening pipe: \"%s\".", errno,
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(char *)errorstring, pipename);
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warn("can not open audio pipe -- error %d (\"%s\") opening pipe: \"%s\".", errno,
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(char *)errorstring, pipename);
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}
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}
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static int play(void *buf, int samples, __attribute__((unused)) int sample_type,
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__attribute__((unused)) uint32_t timestamp,
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__attribute__((unused)) uint64_t playtime) {
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// if the file is not open, try to open it.
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char errorstring[1024];
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if (fd == -1) {
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fd = try_to_open_pipe_for_writing(pipename);
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}
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// if it's got a reader, write to it.
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if (fd > 0) {
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// int rc = non_blocking_write(fd, buf, samples * 4);
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int rc = write(fd, buf, samples * 4);
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if ((rc < 0) && (errno != EPIPE)) {
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strerror_r(errno, (char *)errorstring, 1024);
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debug(1, "audio_pip play: error %d writing to the pipe named \"%s\": \"%s\".", errno,
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pipename, errorstring);
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}
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}
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return 0;
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}
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static void stop(void) {
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// Don't close the pipe just because a play session has stopped.
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}
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static int init(int argc, char **argv) {
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// debug(1, "pipe init");
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// const char *str;
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// int value;
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// double dvalue;
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// set up default values first
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config.audio_backend_buffer_desired_length = 1.0;
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config.audio_backend_latency_offset = 0;
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// do the "general" audio options. Note, these options are in the "general" stanza!
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parse_general_audio_options();
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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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}
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if (argc > 1)
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die("too many command-line arguments to pipe");
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if (argc == 1)
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pipename = argv[0]; // command line argument has priority
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if ((pipename) && (strcasecmp(pipename, "STDOUT") == 0))
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die("Can't use \"pipe\" backend for STDOUT. Use the \"stdout\" backend instead.");
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if (pipename == NULL)
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pipename = default_pipe_name; // if none specified
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// here, create the pipe
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mode_t oldumask = umask(000);
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if (mkfifo(pipename, 0666) && errno != EEXIST)
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die("Could not create audio pipe \"%s\"", pipename);
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umask(oldumask);
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debug(1, "audio pipe name is \"%s\"", pipename);
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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)
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close(fd);
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}
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static void help(void) {
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printf(" Provide the pipe's pathname. The default is \"%s\".\n", default_pipe_name);
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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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.prepare = NULL,
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.start = &start,
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.stop = &stop,
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.is_running = NULL,
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.flush = NULL,
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.delay = NULL,
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.stats = NULL,
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.play = &play,
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.volume = NULL,
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.parameters = NULL,
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.mute = NULL};
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