190 lines
5.9 KiB
C
190 lines
5.9 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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* Copyright (c) Mike Brady 2014 -- 2022
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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 <ao/ao.h>
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#include <memory.h>
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#include <stdio.h>
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#include <unistd.h>
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ao_device *dev = NULL;
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ao_option *ao_opts = NULL;
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ao_sample_format fmt;
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int driver = 0;
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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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// get a list of drivers available
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ao_initialize();
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int defaultDriver = ao_default_driver_id();
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if (defaultDriver == -1) {
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printf(" No usable drivers available.\n");
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} else {
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ao_info *defaultDriverInfo = ao_driver_info(defaultDriver);
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int driver_count;
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ao_info **driver_list = ao_driver_info_list(&driver_count);
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int i = 0;
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if (driver_count == 0) {
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printf(" Driver list unavailable.\n");
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} else {
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printf(" Drivers:\n");
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for (i = 0; i < driver_count; i++) {
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ao_info *the_driver = driver_list[i];
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if (strcmp(the_driver->short_name, defaultDriverInfo->short_name) == 0)
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printf(" \"%s\" (default)\n", the_driver->short_name);
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else
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printf(" \"%s\"\n", the_driver->short_name);
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}
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}
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}
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ao_shutdown();
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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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driver = ao_default_driver_id();
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if (driver == -1) {
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warn("libao can not find a usable driver!");
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} else {
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// set up default values first
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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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// get settings from settings file first, allow them to be overridden by
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// command line options
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// do the "general" audio options. Note, these options are in the "general" stanza!
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parse_general_audio_options();
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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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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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fmt.matrix = strdup("L,R");
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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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if (dev != NULL)
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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(__attribute__((unused)) int sample_rate,
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__attribute__((unused)) int sample_format) {
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// debug(1,"libao start");
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}
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static int play(void *buf, int samples, __attribute__((unused)) int sample_type,
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__attribute__((unused)) uint32_t timestamp,
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__attribute__((unused)) uint64_t playtime) {
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int response = 0;
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int oldState;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable
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if (driver != -1) {
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if (dev == NULL)
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dev = ao_open_live(driver, &fmt, ao_opts);
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if (dev != NULL)
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response = ao_play(dev, buf, samples * 4);
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}
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pthread_setcancelstate(oldState, NULL);
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return response;
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}
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static void stop(void) {
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// debug(1,"libao stop");
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if (dev != NULL) {
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ao_close(dev);
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dev = NULL;
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}
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}
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audio_output audio_ao = {.name = "ao",
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.help = &help,
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.init = &init,
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.deinit = &deinit,
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.prepare = NULL,
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.start = &start,
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.stop = &stop,
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.is_running = NULL,
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.flush = NULL,
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.delay = NULL,
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.stats = 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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