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/*
* stdout output driver. This file is part of Shairport Sync.
* Copyright (c) Mike Brady 2015
*
* Based on pipe output driver
* 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 "audio.h"
#include "common.h"
#include <errno.h>
#include <fcntl.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static int fd = -1;
static void start(int sample_rate, int sample_format) { fd = STDOUT_FILENO; }
static void play(short buf[], int samples) { int ignore = write(fd, buf, samples * 4); }
static void stop(void) {
// don't close stdout
}
static int init(int argc, char **argv) {
const char *str;
int value;
double dvalue;
config.audio_backend_buffer_desired_length = 1.0;
config.audio_backend_latency_offset = 0;
if (config.cfg != NULL) {
/* Get the desired buffer size setting. */
if (config_lookup_int(config.cfg, "stdout.audio_backend_buffer_desired_length", &value)) {
if ((value < 0) || (value > 66150)) {
inform("The setting audio_backend_buffer_desired_length is deprecated. "
"Use audio_backend_buffer_desired_length_in_seconds instead.");
die("Invalid stdout audio backend buffer desired length \"%d\". It "
"should be between 0 and "
"66150, default is 6615",
value);
} else {
inform("The stdout.setting audio_backend_buffer_desired_length is deprecated. "
"Use stdout.audio_backend_buffer_desired_length_in_seconds instead.");
config.audio_backend_buffer_desired_length = 1.0 * value / 44100;
}
}
/* Get the desired buffer size setting. */
if (config_lookup_float(config.cfg, "stdout.audio_backend_buffer_desired_length_in_seconds",
&dvalue)) {
if ((dvalue < 0) || (dvalue > 1.5)) {
die("Invalid stdout audio backend buffer desired time \"%f\". It "
"should be between 0 and "
"1.5, default is 0.15 seconds",
dvalue);
} else {
config.audio_backend_buffer_desired_length = dvalue;
}
}
/* Get the latency offset. */
if (config_lookup_int(config.cfg, "stdout.audio_backend_latency_offset", &value)) {
if ((value < -66150) || (value > 66150)) {
inform("The setting stdout.audio_backend_latency_offset is deprecated. "
"Use stdout.audio_backend_latency_offset_in_seconds instead.");
die("Invalid stdout audio backend buffer latency offset \"%d\". It "
"should be between -66150 and +66150, default is 0",
value);
} else {
inform("The setting stdout.audio_backend_latency_offset is deprecated. "
"Use stdout.audio_backend_latency_offset_in_seconds instead.");
config.audio_backend_latency_offset = 1.0 * value / 44100;
}
}
/* Get the latency offset. */
if (config_lookup_float(config.cfg, "stdout.audio_backend_latency_offset_in_seconds",
&dvalue)) {
if ((dvalue < -1.0) || (dvalue > 1.5)) {
die("Invalid stdout audio backend buffer latency offset time \"%f\". It "
"should be between -1.0 and +1.5, default is 0 seconds",
dvalue);
} else {
config.audio_backend_latency_offset = dvalue;
}
}
}
return 0;
}
static void deinit(void) {
// don't close stdout
}
static void help(void) { printf(" stdout takes no arguments\n"); }
audio_output audio_stdout = {.name = "stdout",
.help = &help,
.init = &init,
.deinit = &deinit,
.start = &start,
.stop = &stop,
.flush = NULL,
.delay = NULL,
.play = &play,
.volume = NULL,
.parameters = NULL,
.mute = NULL};
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