144 lines
5.2 KiB
C
144 lines
5.2 KiB
C
/*
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* stdout output driver. This file is part of Shairport Sync.
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* Copyright (c) Mike Brady 2015
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*
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* Based on pipe output driver
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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 "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 <unistd.h>
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static int fd = -1;
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static void start(int sample_rate, int sample_format) { fd = STDOUT_FILENO; }
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static void play(short buf[], int samples) {
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char errorstring[1024];
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int warned = 0;
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int rc = write(fd, buf, samples * 4);
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if ((rc<0) && (warned==0)) {
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strerror_r(errno,(char*)errorstring,1024);
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warn("Error %d writing to stdout: \"%s\".",errno,errorstring);
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warned = 1;
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}
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}
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static void stop(void) {
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// don't close stdout
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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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double dvalue;
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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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if (config.cfg != NULL) {
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/* Get the desired buffer size setting. */
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if (config_lookup_int(config.cfg, "stdout.audio_backend_buffer_desired_length", &value)) {
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if ((value < 0) || (value > 66150)) {
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inform("The setting audio_backend_buffer_desired_length is deprecated. "
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"Use audio_backend_buffer_desired_length_in_seconds instead.");
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die("Invalid stdout audio backend buffer desired length \"%d\". It "
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"should be between 0 and "
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"66150, default is 6615",
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value);
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} else {
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inform("The stdout.setting audio_backend_buffer_desired_length is deprecated. "
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"Use stdout.audio_backend_buffer_desired_length_in_seconds instead.");
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config.audio_backend_buffer_desired_length = 1.0 * value / 44100;
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}
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}
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/* Get the desired buffer size setting. */
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if (config_lookup_float(config.cfg, "stdout.audio_backend_buffer_desired_length_in_seconds",
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&dvalue)) {
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if ((dvalue < 0) || (dvalue > 1.5)) {
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die("Invalid stdout audio backend buffer desired time \"%f\". It "
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"should be between 0 and "
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"1.5, default is 0.15 seconds",
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dvalue);
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} else {
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config.audio_backend_buffer_desired_length = dvalue;
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}
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}
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/* Get the latency offset. */
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if (config_lookup_int(config.cfg, "stdout.audio_backend_latency_offset", &value)) {
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if ((value < -66150) || (value > 66150)) {
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inform("The setting stdout.audio_backend_latency_offset is deprecated. "
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"Use stdout.audio_backend_latency_offset_in_seconds instead.");
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die("Invalid stdout audio backend buffer latency offset \"%d\". It "
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"should be between -66150 and +66150, default is 0",
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value);
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} else {
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inform("The setting stdout.audio_backend_latency_offset is deprecated. "
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"Use stdout.audio_backend_latency_offset_in_seconds instead.");
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config.audio_backend_latency_offset = 1.0 * value / 44100;
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}
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}
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/* Get the latency offset. */
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if (config_lookup_float(config.cfg, "stdout.audio_backend_latency_offset_in_seconds",
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&dvalue)) {
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if ((dvalue < -1.0) || (dvalue > 1.5)) {
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die("Invalid stdout audio backend buffer latency offset time \"%f\". It "
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"should be between -1.0 and +1.5, default is 0 seconds",
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dvalue);
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} else {
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config.audio_backend_latency_offset = dvalue;
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}
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}
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}
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return 0;
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}
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static void deinit(void) {
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// don't close stdout
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}
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static void help(void) { printf(" stdout takes no arguments\n"); }
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audio_output audio_stdout = {.name = "stdout",
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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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.mute = NULL};
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