2 e26da60a 2023-03-23 op * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
4 e26da60a 2023-03-23 op * Permission to use, copy, modify, and distribute this software for any
5 e26da60a 2023-03-23 op * purpose with or without fee is hereby granted, provided that the above
6 e26da60a 2023-03-23 op * copyright notice and this permission notice appear in all copies.
8 e26da60a 2023-03-23 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 e26da60a 2023-03-23 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 e26da60a 2023-03-23 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 e26da60a 2023-03-23 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 e26da60a 2023-03-23 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 e26da60a 2023-03-23 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 e26da60a 2023-03-23 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 e26da60a 2023-03-23 op #include "config.h"
19 e26da60a 2023-03-23 op #include <alsa/asoundlib.h>
21 e26da60a 2023-03-23 op #include <limits.h>
23 e26da60a 2023-03-23 op #include "amused.h"
24 e26da60a 2023-03-23 op #include "log.h"
26 e26da60a 2023-03-23 op static snd_pcm_t *pcm;
27 bbd1402d 2023-03-23 op static size_t bpf;
28 8b3efdb3 2023-05-12 op static void (*onmove_cb)(void *, int);
31 8b3efdb3 2023-05-12 op audio_open(void (*cb)(void *, int))
33 e26da60a 2023-03-23 op const char *device = "default";
36 e26da60a 2023-03-23 op err = snd_pcm_open(&pcm, device, SND_PCM_STREAM_PLAYBACK,
37 e26da60a 2023-03-23 op SND_PCM_NONBLOCK);
38 e26da60a 2023-03-23 op if (err < 0) {
39 e26da60a 2023-03-23 op log_warnx("playback open error: %s", snd_strerror(err));
43 8b3efdb3 2023-05-12 op onmove_cb = cb;
48 e26da60a 2023-03-23 op audio_setup(unsigned int bits, unsigned int rate, unsigned int channels,
49 b02dadd3 2023-05-13 op struct pollfd *pfds, int nfds)
52 e26da60a 2023-03-23 op snd_pcm_format_t fmt;
54 bbd1402d 2023-03-23 op if (bits == 8) {
55 e26da60a 2023-03-23 op fmt = SND_PCM_FORMAT_S8;
57 bbd1402d 2023-03-23 op } else if (bits == 16) {
58 e26da60a 2023-03-23 op fmt = SND_PCM_FORMAT_S16;
60 bbd1402d 2023-03-23 op } else if (bits == 24) {
61 e26da60a 2023-03-23 op fmt = SND_PCM_FORMAT_S24;
63 bbd1402d 2023-03-23 op } else if (bits == 32) {
64 e26da60a 2023-03-23 op fmt = SND_PCM_FORMAT_S32;
67 e26da60a 2023-03-23 op log_warnx("can't handle %d bits", bits);
71 bbd1402d 2023-03-23 op bpf *= channels;
73 e26da60a 2023-03-23 op err = snd_pcm_set_params(pcm, fmt, SND_PCM_ACCESS_RW_INTERLEAVED,
74 e26da60a 2023-03-23 op channels, rate, 1, 500000 /* 0.5s */);
75 e26da60a 2023-03-23 op if (err < 0) {
76 e26da60a 2023-03-23 op log_warnx("invalid params: %s", snd_strerror(err));
80 e26da60a 2023-03-23 op err = snd_pcm_prepare(pcm);
81 e26da60a 2023-03-23 op if (err < 0) {
82 e26da60a 2023-03-23 op log_warnx("snd_pcm_prepare failed: %s", snd_strerror(err));
90 e26da60a 2023-03-23 op audio_nfds(void)
92 e26da60a 2023-03-23 op return snd_pcm_poll_descriptors_count(pcm);
96 b02dadd3 2023-05-13 op audio_pollfd(struct pollfd *pfds, int nfds, int events)
98 b02dadd3 2023-05-13 op return snd_pcm_poll_descriptors(pcm, pfds, nfds);
102 b02dadd3 2023-05-13 op audio_revents(struct pollfd *pfds, int nfds)
105 e26da60a 2023-03-23 op unsigned short revents;
107 b02dadd3 2023-05-13 op err = snd_pcm_poll_descriptors_revents(pcm, pfds, nfds, &revents);
108 e26da60a 2023-03-23 op if (err < 0) {
109 e26da60a 2023-03-23 op log_warnx("snd revents failure: %s", snd_strerror(err));
113 e26da60a 2023-03-23 op return revents;
117 e26da60a 2023-03-23 op audio_write(const void *buf, size_t len)
119 bbd1402d 2023-03-23 op snd_pcm_sframes_t avail, ret;
122 bbd1402d 2023-03-23 op * snd_pcm_writei works in terms of FRAMES, not BYTES!
126 bbd1402d 2023-03-23 op avail = snd_pcm_avail_update(pcm);
127 bbd1402d 2023-03-23 op if (avail < 0) {
128 bbd1402d 2023-03-23 op if (avail == -EPIPE) {
129 440c29a4 2023-05-12 op log_debug("alsa xrun occurred");
130 440c29a4 2023-05-12 op snd_pcm_recover(pcm, -EPIPE, 1);
133 bbd1402d 2023-03-23 op log_warnx("snd_pcm_avail_update failure: %s",
134 bbd1402d 2023-03-23 op snd_strerror(avail));
138 bbd1402d 2023-03-23 op if (len > avail)
141 e26da60a 2023-03-23 op ret = snd_pcm_writei(pcm, buf, len);
142 e26da60a 2023-03-23 op if (ret < 0) {
143 e26da60a 2023-03-23 op log_warnx("snd_pcm_writei failed: %s", snd_strerror(ret));
146 8b3efdb3 2023-05-12 op if (onmove_cb)
147 8b3efdb3 2023-05-12 op onmove_cb(NULL, ret);
148 bbd1402d 2023-03-23 op return ret * bpf;
152 e26da60a 2023-03-23 op audio_flush(void)
156 e26da60a 2023-03-23 op err = snd_pcm_drop(pcm);
157 e26da60a 2023-03-23 op if (err < 0) {
158 e26da60a 2023-03-23 op log_warnx("snd_pcm_drop: %s", snd_strerror(err));
166 e26da60a 2023-03-23 op audio_stop(void)
170 e26da60a 2023-03-23 op err = snd_pcm_drain(pcm);
171 e26da60a 2023-03-23 op if (err < 0) {
172 e26da60a 2023-03-23 op log_warnx("snd_pcm_drain: %s", snd_strerror(err));