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shairport-sync/audio.c

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/*
* Audio driver handler. This file is part of Shairport.
* Copyright (c) James Laird 2013
* Modifications (c) Mike Brady 2014 -- 2019
* 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 "config.h"
#include <stdio.h>
#include <string.h>
#ifdef CONFIG_JACK
extern audio_output audio_jack;
#endif
#ifdef CONFIG_SNDIO
extern audio_output audio_sndio;
#endif
#ifdef CONFIG_AO
extern audio_output audio_ao;
#endif
#ifdef CONFIG_SOUNDIO
extern audio_output audio_soundio;
#endif
#ifdef CONFIG_PW
extern audio_output audio_pw;
#endif
#ifdef CONFIG_PA
extern audio_output audio_pa;
#endif
#ifdef CONFIG_ALSA
extern audio_output audio_alsa;
#endif
#ifdef CONFIG_DUMMY
extern audio_output audio_dummy;
#endif
#ifdef CONFIG_PIPE
extern audio_output audio_pipe;
#endif
#ifdef CONFIG_STDOUT
extern audio_output audio_stdout;
#endif
static audio_output *outputs[] = {
#ifdef CONFIG_ALSA
&audio_alsa,
#endif
#ifdef CONFIG_SNDIO
&audio_sndio,
#endif
#ifdef CONFIG_PW
&audio_pw,
#endif
#ifdef CONFIG_PA
&audio_pa,
#endif
#ifdef CONFIG_JACK
&audio_jack,
#endif
#ifdef CONFIG_AO
&audio_ao,
#endif
#ifdef CONFIG_SOUNDIO
&audio_soundio,
#endif
#ifdef CONFIG_PIPE
&audio_pipe,
#endif
#ifdef CONFIG_STDOUT
&audio_stdout,
#endif
#ifdef CONFIG_DUMMY
&audio_dummy,
#endif
NULL};
audio_output *audio_get_output(const char *name) {
audio_output **out;
// default to the first
if (!name)
return outputs[0];
for (out = outputs; *out; out++)
if (!strcasecmp(name, (*out)->name))
return *out;
return NULL;
}
void audio_ls_outputs(void) {
audio_output **out;
printf("Available audio backends:\n");
for (out = outputs; *out; out++)
printf(" %s%s\n", (*out)->name, out == outputs ? " (default)" : "");
for (out = outputs; *out; out++) {
printf("\n");
if ((*out)->help) {
printf("Settings and options for the audio backend \"%s\":\n", (*out)->name);
(*out)->help();
} else {
printf("There are no settings or options for the audio backend \"%s\".\n", (*out)->name);
}
}
}
void parse_general_audio_options(void) {
/* this must be called after the output device has been initialised, so that the default values
* are set before any options are chosen */
int value;
double dvalue;
const char *str = 0;
if (config.cfg != NULL) {
/* Get the desired buffer size setting (deprecated). */
if (config_lookup_int(config.cfg, "general.audio_backend_buffer_desired_length", &value)) {
if ((value < 0) || (value > 66150)) {
inform("The setting general.audio_backend_buffer_desired_length is deprecated. "
"Use alsa.audio_backend_buffer_desired_length_in_seconds instead.");
die("Invalid audio_backend_buffer_desired_length value: \"%d\". It "
"should be between 0 and "
"66150, default is %d",
value, (int)(config.audio_backend_buffer_desired_length * 44100));
} else {
inform("The setting general.audio_backend_buffer_desired_length is deprecated. "
"Use general.audio_backend_buffer_desired_length_in_seconds instead.");
config.audio_backend_buffer_desired_length = 1.0 * value / 44100;
}
}
/* Get the desired buffer size setting in seconds. */
if (config_lookup_float(config.cfg, "general.audio_backend_buffer_desired_length_in_seconds",
&dvalue)) {
if (dvalue < 0) {
die("Invalid audio_backend_buffer_desired_length_in_seconds value: \"%f\". It "
"should be 0.0 or greater."
" The default is %.3f seconds",
dvalue, config.audio_backend_buffer_desired_length);
} else {
config.audio_backend_buffer_desired_length = dvalue;
}
}
/* Get the minimum buffer size for fancy interpolation setting in seconds. */
if (config_lookup_float(config.cfg,
"general.audio_backend_buffer_interpolation_threshold_in_seconds",
&dvalue)) {
if ((dvalue < 0) || (dvalue > config.audio_backend_buffer_desired_length)) {
die("Invalid audio_backend_buffer_interpolation_threshold_in_seconds value: \"%f\". It "
"should be between 0 and "
"audio_backend_buffer_desired_length_in_seconds of %.3f, default is %.3f seconds",
dvalue, config.audio_backend_buffer_desired_length,
config.audio_backend_buffer_interpolation_threshold_in_seconds);
} else {
config.audio_backend_buffer_interpolation_threshold_in_seconds = dvalue;
}
}
/* Get the latency offset (deprecated). */
if (config_lookup_int(config.cfg, "general.audio_backend_latency_offset", &value)) {
if ((value < -66150) || (value > 66150)) {
inform("The setting general.audio_backend_latency_offset is deprecated. "
"Use general.audio_backend_latency_offset_in_seconds instead.");
die("Invalid audio_backend_latency_offset value: \"%d\". It "
"should be between -66150 and +66150, default is 0",
value);
} else {
inform("The setting general.audio_backend_latency_offset is deprecated. "
"Use general.audio_backend_latency_offset_in_seconds instead.");
config.audio_backend_latency_offset = 1.0 * value / 44100;
}
}
/* Get the latency offset in seconds. */
if (config_lookup_float(config.cfg, "general.audio_backend_latency_offset_in_seconds",
&dvalue)) {
config.audio_backend_latency_offset = dvalue;
}
/* Check if the length of the silent lead-in ia set to \"auto\". */
if (config_lookup_string(config.cfg, "general.audio_backend_silent_lead_in_time", &str)) {
if (strcasecmp(str, "auto") == 0) {
config.audio_backend_silent_lead_in_time_auto = 1;
} else {
if (config.audio_backend_silent_lead_in_time_auto == 1)
warn("Invalid audio_backend_silent_lead_in_time \"%s\". It should be \"auto\" or the "
"lead-in time in seconds. "
"It remains set to \"auto\". Note: numbers should not be placed in quotes.",
str);
else
warn("Invalid output rate \"%s\". It should be \"auto\" or the lead-in time in seconds. "
"It remains set to %f. Note: numbers should not be placed in quotes.",
str, config.audio_backend_silent_lead_in_time);
}
}
/* Get the desired length of the silent lead-in. */
if (config_lookup_float(config.cfg, "general.audio_backend_silent_lead_in_time", &dvalue)) {
if ((dvalue < 0.0) || (dvalue > 4)) {
if (config.audio_backend_silent_lead_in_time_auto == 1)
warn("Invalid audio_backend_silent_lead_in_time \"%f\". It "
"must be between 0.0 and 4.0 seconds. Omit the setting to use the automatic value. "
"The setting remains at \"auto\".",
dvalue);
else
warn("Invalid audio_backend_silent_lead_in_time \"%f\". It "
"must be between 0.0 and 4.0 seconds. Omit the setting to use the automatic value. "
"It remains set to %f.",
dvalue, config.audio_backend_silent_lead_in_time);
} else {
config.audio_backend_silent_lead_in_time = dvalue;
config.audio_backend_silent_lead_in_time_auto = 0;
}
}
}
}
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