95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
#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 = 0;
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// some platforms apparently require optreset = 1; - which?
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char opt, *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)
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die("could not find ao driver %s\n", 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\n", 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\n", opt);
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}
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}
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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, NULL);
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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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}
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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!\n");
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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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.play = &play,
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.volume = NULL
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};
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