133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
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* libao output driver. This file is part of Shairport.
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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 <stdio.h>
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#include <unistd.h>
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#include <memory.h>
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#include <ao/ao.h>
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#include "common.h"
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#include "audio.h"
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ao_device *dev = NULL;
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static void help(void) {
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printf(" -d driver set the output driver\n"
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" -o name=value set an arbitrary ao option\n"
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" -i id shorthand for -o id=<id>\n"
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" -n name shorthand for -o dev=<name> -o dsp=<name>\n"
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);
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}
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static int init(int argc, char **argv) {
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ao_initialize();
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int driver = ao_default_driver_id();
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ao_option *ao_opts = NULL;
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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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char *mid;
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while ((opt = getopt(argc, argv, "d:i:n:o:")) > 0) {
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switch (opt) {
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case 'd':
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driver = ao_driver_id(optarg);
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if (driver < 0)
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die("could not find ao driver %s", optarg);
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break;
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case 'i':
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ao_append_option(&ao_opts, "id", optarg);
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break;
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case 'n':
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ao_append_option(&ao_opts, "dev", optarg);
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// Old libao versions (for example, 0.8.8) only support
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// "dsp" instead of "dev".
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ao_append_option(&ao_opts, "dsp", optarg);
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break;
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case 'o':
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mid = strchr(optarg, '=');
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if (!mid)
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die("Expected an = in audio option %s", optarg);
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*mid = 0;
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ao_append_option(&ao_opts, optarg, mid+1);
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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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ao_sample_format fmt;
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memset(&fmt, 0, sizeof(fmt));
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fmt.bits = 16;
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fmt.rate = 44100;
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fmt.channels = 2;
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fmt.byte_format = AO_FMT_NATIVE;
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dev = ao_open_live(driver, &fmt, ao_opts);
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return dev ? 0 : 1;
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}
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static void deinit(void) {
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if (dev)
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ao_close(dev);
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dev = NULL;
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ao_shutdown();
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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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ao_play(dev, (char*)buf, samples*4);
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}
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static void stop(void) {
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}
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audio_output audio_ao = {
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.name = "ao",
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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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};
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