142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
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* PulseAudio output driver. This file is part of Shairport.
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* Copyright (c) Paul Lietar 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 <stdio.h>
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#include <unistd.h>
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#include <memory.h>
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#include <pulse/simple.h>
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#include <pulse/error.h>
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#include <pulse/def.h>
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#include "common.h"
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#include "audio.h"
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static pa_simple *pa_dev = NULL;
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static struct {
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char *server;
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char *sink;
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char *apname;
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} pulse_options = {.server = NULL, .sink = NULL, .apname = NULL};
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static int pa_error;
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static void pulse_connect(void);
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static void help(void) {
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printf(" -a server set the server name\n"
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" -s sink set the output sink\n"
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" -n name set the application name, as seen by PulseAudio\n"
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" defaults to the access point name\n");
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}
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static int init(int argc, char **argv) {
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pulse_options.apname = config.apname;
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config.audio_backend_buffer_desired_length = 44100; // one second.
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config.audio_backend_latency_offset = 0;
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optind = 1; // optind=0 is equivalent to optind=1 plus special behaviour
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argv--; // so we shift the arguments to satisfy getopt()
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argc++;
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// some platforms apparently require optreset = 1; - which?
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int opt;
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while ((opt = getopt(argc, argv, "a:s:n:")) > 0) {
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switch (opt) {
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case 'a':
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pulse_options.server = optarg;
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break;
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case 's':
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pulse_options.sink = optarg;
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break;
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case 'n':
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pulse_options.apname = optarg;
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break;
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default:
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help();
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die("Invalid audio option -%c specified", opt);
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}
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}
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if (optind < argc)
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die("Invalid audio argument: %s", argv[optind]);
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pulse_connect();
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return 0;
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}
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static void pulse_connect(void) {
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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(pulse_options.server, pulse_options.apname, PA_STREAM_PLAYBACK,
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pulse_options.sink, "Shairport Stream", &ss, NULL, NULL, &pa_error);
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if (!pa_dev)
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die("Could not connect to pulseaudio server: %s", pa_strerror(pa_error));
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}
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static void deinit(void) {
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if (pa_dev)
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pa_simple_free(pa_dev);
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pa_dev = NULL;
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}
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static void start(int sample_rate) {
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if (sample_rate != 44100)
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die("unexpected sample rate!");
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}
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static void play(short buf[], int samples) {
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if (pa_simple_write(pa_dev, (char *)buf, (size_t)samples * 4, &pa_error) < 0) {
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fprintf(stderr, __FILE__ ": pa_simple_write() failed: %s\n", pa_strerror(pa_error));
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if (pa_error == PA_ERR_CONNECTIONTERMINATED) {
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fprintf(stderr, __FILE__ ": reconnecting.");
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deinit();
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pulse_connect();
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}
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}
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}
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static void stop(void) {
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if (pa_simple_drain(pa_dev, &pa_error) < 0)
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fprintf(stderr, __FILE__ ": pa_simple_drain() failed: %s\n", pa_strerror(pa_error));
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}
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audio_output audio_pulse = {.name = "pulse",
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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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