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It uses libpulse's synchronous API, to output to PulseAudio without using libao.
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/* | ||
* PulseAudio output driver. This file is part of Shairport. | ||
* Copyright (c) Paul Lietar 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. | ||
*/ | ||
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#include <stdio.h> | ||
#include <unistd.h> | ||
#include <memory.h> | ||
#include <pulse/simple.h> | ||
#include <pulse/error.h> | ||
#include "common.h" | ||
#include "audio.h" | ||
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pa_simple *pa_dev = NULL; | ||
int pa_error; | ||
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static void help(void) { | ||
printf(" -a server set the server name\n" | ||
" -s sink set the output sink\n" | ||
); | ||
} | ||
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static int init(int argc, char **argv) { | ||
const char *server = NULL; | ||
const char *sink = NULL; | ||
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optind = 0; | ||
// some platforms apparently require optreset = 1; - which? | ||
int opt; | ||
char *mid; | ||
while ((opt = getopt(argc, argv, "a:s:")) > 0) { | ||
switch (opt) { | ||
case 'a': | ||
server = optarg; | ||
break; | ||
case 's': | ||
sink = optarg; | ||
break; | ||
default: | ||
help(); | ||
die("Invalid audio option -%c specified", opt); | ||
} | ||
} | ||
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static const pa_sample_spec ss = { | ||
.format = PA_SAMPLE_S16LE, | ||
.rate = 44100, | ||
.channels = 2 | ||
}; | ||
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pa_dev = pa_simple_new(server, "shairport", PA_STREAM_PLAYBACK, sink, "shairport", &ss, NULL, NULL, &pa_error); | ||
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return pa_dev ? 0 : 1; | ||
} | ||
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static void deinit(void) { | ||
if (pa_dev) | ||
pa_simple_free(pa_dev); | ||
pa_dev = NULL; | ||
} | ||
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static void start(int sample_rate) { | ||
if (sample_rate != 44100) | ||
die("unexpected sample rate!"); | ||
} | ||
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static void play(short buf[], int samples) { | ||
if( pa_simple_write(pa_dev, (char *)buf, (size_t)samples * 4, &pa_error) < 0 ) | ||
fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n", pa_strerror(pa_error)); | ||
} | ||
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static void stop(void) { | ||
if (pa_simple_drain(pa_dev, &pa_error) < 0) | ||
fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n", pa_strerror(pa_error)); | ||
} | ||
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audio_output audio_pulse = { | ||
.name = "pulse", | ||
.help = &help, | ||
.init = &init, | ||
.deinit = &deinit, | ||
.start = &start, | ||
.stop = &stop, | ||
.play = &play, | ||
.volume = NULL | ||
}; |
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