audiod: fix enum of supported audio formats
[paraslash.git] / alsa_write.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file alsa_write.c paraslash's alsa output plugin */
20
21 /*
22 * Based in parts on aplay.c from the alsa-utils-1.0.8 package,
23 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>, which is
24 * based on the vplay program by Michael Beck.
25 */
26
27 #include "para.h"
28 #include "fd.h"
29 #include "string.h"
30 #include "list.h"
31 #include "sched.h"
32 #include "write.h"
33
34 #include <alsa/asoundlib.h>
35
36 #include "alsa_write.cmdline.h"
37 #include "error.h"
38
39
40 #define FORMAT SND_PCM_FORMAT_S16_LE
41
42 /** data specific to the alsa writer */
43 struct private_alsa_write_data {
44 /** the alsa handle */
45 snd_pcm_t *handle;
46 /** determined and set by alsa_open() */
47 size_t bytes_per_frame;
48 /** don't write anything until this time */
49 struct timeval next_chunk;
50 /** the return value of snd_pcm_hw_params_get_buffer_time_max() */
51 unsigned buffer_time;
52 unsigned samplerate;
53 unsigned channels;
54 };
55
56 /*
57 * open and prepare the PCM handle for writing
58 *
59 * Install PCM software and hardware configuration. Exit on errors.
60 */
61 static int alsa_open(struct writer_node *w)
62 {
63 snd_pcm_hw_params_t *hwparams;
64 snd_pcm_sw_params_t *swparams;
65 snd_pcm_uframes_t buffer_size, xfer_align, start_threshold,
66 stop_threshold;
67 int err;
68 snd_pcm_info_t *info;
69 snd_pcm_uframes_t period_size;
70 struct private_alsa_write_data *pad = para_calloc(sizeof(struct
71 private_alsa_write_data));
72 struct alsa_write_args_info *conf = w->conf;
73 struct writer_node_group *wng = w->wng;
74
75 if (!conf->samplerate_given && wng->samplerate)
76 pad->samplerate = *wng->samplerate;
77 else
78 pad->samplerate = conf->samplerate_arg;
79 if (!conf->channels_given && wng->channels)
80 pad->channels = *wng->channels;
81 else
82 pad->channels = conf->channels_arg;
83 PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
84 w->private_data = pad;
85 snd_pcm_info_alloca(&info);
86 err = snd_pcm_open(&pad->handle, conf->device_arg,
87 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
88 if (err < 0)
89 return -E_PCM_OPEN;
90 if ((err = snd_pcm_info(pad->handle, info)) < 0)
91 return -E_SND_PCM_INFO;
92
93 snd_pcm_hw_params_alloca(&hwparams);
94 snd_pcm_sw_params_alloca(&swparams);
95 if (snd_pcm_hw_params_any(pad->handle, hwparams) < 0)
96 return -E_BROKEN_CONF;
97 if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
98 SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
99 return -E_ACCESS_TYPE;
100 if (snd_pcm_hw_params_set_format(pad->handle, hwparams, FORMAT) < 0)
101 return -E_SAMPLE_FORMAT;
102 if (snd_pcm_hw_params_set_channels(pad->handle, hwparams,
103 pad->channels) < 0)
104 return -E_CHANNEL_COUNT;
105 if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
106 &pad->samplerate, 0) < 0)
107 return -E_SET_RATE;
108 err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &pad->buffer_time, 0);
109 if (err < 0 || !pad->buffer_time)
110 return -E_GET_BUFFER_TIME;
111 PARA_INFO_LOG("buffer time: %d\n", pad->buffer_time);
112 if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
113 &pad->buffer_time, 0) < 0)
114 return -E_SET_BUFFER_TIME;
115 if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
116 return -E_HW_PARAMS;
117 snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
118 snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
119 PARA_INFO_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
120 period_size);
121 if (period_size == buffer_size)
122 return -E_BAD_PERIOD;
123 snd_pcm_sw_params_current(pad->handle, swparams);
124 err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
125 if (err < 0 || !xfer_align)
126 return -E_GET_XFER;
127 snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
128 /* round to closest transfer boundary */
129 start_threshold = (buffer_size / xfer_align) * xfer_align;
130 if (start_threshold < 1)
131 start_threshold = 1;
132 if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
133 start_threshold) < 0)
134 return -E_START_THRESHOLD;
135 stop_threshold = buffer_size;
136 if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
137 stop_threshold) < 0)
138 return -E_STOP_THRESHOLD;
139 if (snd_pcm_sw_params_set_xfer_align(pad->handle, swparams,
140 xfer_align) < 0)
141 return -E_SET_XFER;
142 if (snd_pcm_sw_params(pad->handle, swparams) < 0)
143 return -E_SW_PARAMS;
144 pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
145 * pad->channels / 8;
146 if (snd_pcm_nonblock(pad->handle, 1))
147 PARA_ERROR_LOG("%s\n", "failed to set nonblock mode");
148 return period_size * pad->bytes_per_frame;
149 }
150
151 static int alsa_write_pre_select(struct sched *s, struct writer_node *wn)
152 {
153 struct private_alsa_write_data *pad = wn->private_data;
154 struct writer_node_group *wng = wn->wng;
155 struct timeval diff;
156
157 if (*wng->loaded < pad->bytes_per_frame)
158 return 1;
159 if (tv_diff(now, &pad->next_chunk, &diff) < 0) {
160 if (tv_diff(&s->timeout, &diff, NULL) > 0)
161 s->timeout = diff;
162 } else {
163 s->timeout.tv_sec = 0;
164 s->timeout.tv_usec = 1;
165 }
166 return 1;
167 // PARA_INFO_LOG("timeout: %lu\n", tv2ms(&s->timeout));
168 }
169
170 static int alsa_write_post_select(__a_unused struct sched *s,
171 struct writer_node *wn)
172 {
173 struct private_alsa_write_data *pad = wn->private_data;
174 struct writer_node_group *wng = wn->wng;
175 size_t frames = (*wng->loaded - wn->written) / pad->bytes_per_frame;
176 snd_pcm_sframes_t ret;
177 unsigned char *data = (unsigned char*)wng->buf + wn->written;
178 struct timeval tv;
179
180 // PARA_INFO_LOG("%zd frames\n", frames);
181 if (!frames) {
182 if (*wng->input_eof)
183 wn->written = *wng->loaded;
184 return 1;
185 }
186 if (tv_diff(now, &pad->next_chunk, NULL) < 0)
187 return 1;
188 ret = snd_pcm_writei(pad->handle, data, frames);
189 if (ret == -EPIPE) {
190 PARA_WARNING_LOG("%s", "EPIPE\n");
191 snd_pcm_prepare(pad->handle);
192 return 1;
193 }
194 if (ret < 0) {
195 PARA_WARNING_LOG("%s", "ALSA ERROR\n");
196 return -E_ALSA_WRITE;
197 }
198 ms2tv(pad->buffer_time / 4000, &tv);
199 // ms2tv(1, &tv);
200 tv_add(now, &tv, &pad->next_chunk);
201 wn->written += ret * pad->bytes_per_frame;
202 return 1;
203 }
204
205 static void alsa_close(struct writer_node *wn)
206 {
207 struct private_alsa_write_data *pad = wn->private_data;
208 PARA_INFO_LOG("closing writer node %p\n", wn);
209 snd_pcm_drain(pad->handle);
210 snd_pcm_close(pad->handle);
211 snd_config_update_free_global();
212 free(pad);
213 }
214
215 __malloc void *alsa_parse_config(char *options)
216 {
217 struct alsa_write_args_info *conf
218 = para_calloc(sizeof(struct alsa_write_args_info));
219 PARA_INFO_LOG("options: %s, %d\n", options, strcspn(options, " \t"));
220 int ret = alsa_cmdline_parser_string(options, conf, "alsa_write");
221 if (ret)
222 goto err_out;
223 PARA_INFO_LOG("help given: %d\n", conf->help_given);
224 return conf;
225 err_out:
226 free(conf);
227 return NULL;
228 }
229
230 /** the init function of the alsa writer */
231 void alsa_write_init(struct writer *w)
232 {
233 w->open = alsa_open;
234 w->close = alsa_close;
235 w->pre_select = alsa_write_pre_select;
236 w->post_select = alsa_write_post_select;
237 w->parse_config = alsa_parse_config;
238 w->shutdown = NULL; /* nothing to do */
239 }