1 /*
2 * stdout output driver. This file is part of Shairport Sync.
3 * Copyright (c) Mike Brady 2015
4 *
5 * Based on pipe output driver
6 * Copyright (c) James Laird 2013
7 * All rights reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person
10 * obtaining a copy of this software and associated documentation
11 * files (the "Software"), to deal in the Software without
12 * restriction, including without limitation the rights to use,
13 * copy, modify, merge, publish, distribute, sublicense, and/or
14 * sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
22 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
24 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
25 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
28 */
29
30 #include "audio.h"
31 #include "common.h"
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <memory.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38
39 static int fd = -1;
40
start(int sample_rate,int sample_format)41 static void start(__attribute__((unused)) int sample_rate,
42 __attribute__((unused)) int sample_format) {
43 fd = STDOUT_FILENO;
44 }
45
play(void * buf,int samples)46 static int play(void *buf, int samples) {
47 char errorstring[1024];
48 int warned = 0;
49 int rc = write(fd, buf, samples * 4);
50 if ((rc < 0) && (warned == 0)) {
51 strerror_r(errno, (char *)errorstring, 1024);
52 warn("Error %d writing to stdout: \"%s\".", errno, errorstring);
53 warned = 1;
54 }
55 return rc;
56 }
57
stop(void)58 static void stop(void) {
59 // Do nothing when play stops
60 }
61
init(int argc,char ** argv)62 static int init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) {
63 // set up default values first
64 config.audio_backend_buffer_desired_length = 1.0;
65 config.audio_backend_latency_offset = 0;
66
67 // get settings from settings file
68 // do the "general" audio options. Note, these options are in the "general" stanza!
69 parse_general_audio_options();
70 return 0;
71 }
72
deinit(void)73 static void deinit(void) {
74 // don't close stdout
75 }
76
77 audio_output audio_stdout = {.name = "stdout",
78 .help = NULL,
79 .init = &init,
80 .deinit = &deinit,
81 .prepare = NULL,
82 .start = &start,
83 .stop = &stop,
84 .is_running = NULL,
85 .flush = NULL,
86 .delay = NULL,
87 .play = &play,
88 .volume = NULL,
89 .parameters = NULL,
90 .mute = NULL};
91