4 This file is part of polypaudio.
6 polypaudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 polypaudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <asoundlib.h>
38 #include "sample-util.h"
39 #include "alsa-util.h"
42 snd_pcm_t *pcm_handle;
45 unsigned n_io_sources;
47 size_t frame_size, fragment_size;
48 struct pa_memchunk memchunk, silence;
51 static const char* const valid_modargs[] = {
62 #define DEFAULT_SINK_NAME "alsa_output"
63 #define DEFAULT_DEVICE "plughw:0,0"
65 static void xrun_recovery(struct userdata *u) {
68 fprintf(stderr, "*** ALSA-XRUN (playback) ***\n");
70 if (snd_pcm_prepare(u->pcm_handle) < 0)
71 fprintf(stderr, "snd_pcm_prepare() failed\n");
74 static void do_write(struct userdata *u) {
78 struct pa_memchunk *memchunk = NULL;
79 snd_pcm_sframes_t frames;
81 if (u->memchunk.memblock)
82 memchunk = &u->memchunk;
84 if (pa_sink_render(u->sink, u->fragment_size, &u->memchunk) < 0)
85 memchunk = &u->silence;
87 memchunk = &u->memchunk;
90 assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
92 if ((frames = snd_pcm_writei(u->pcm_handle, memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
93 if (frames == -EAGAIN)
96 if (frames == -EPIPE) {
101 fprintf(stderr, "snd_pcm_writei() failed\n");
105 if (memchunk == &u->memchunk) {
106 size_t l = frames * u->frame_size;
107 memchunk->index += l;
108 memchunk->length -= l;
110 if (memchunk->length == 0) {
111 pa_memblock_unref(memchunk->memblock);
112 memchunk->memblock = NULL;
113 memchunk->index = memchunk->length = 0;
121 static void io_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
122 struct userdata *u = userdata;
123 assert(u && a && id);
125 if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
131 static uint32_t sink_get_latency_cb(struct pa_sink *s) {
132 struct userdata *u = s->userdata;
133 snd_pcm_sframes_t frames;
134 assert(s && u && u->sink);
136 if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
137 fprintf(stderr, __FILE__": failed to get delay\n");
138 s->get_latency = NULL;
145 return pa_samples_usec(frames * u->frame_size, &s->sample_spec);
148 int pa_module_init(struct pa_core *c, struct pa_module*m) {
149 struct pa_modargs *ma = NULL;
151 struct userdata *u = NULL;
153 struct pa_sample_spec ss;
154 unsigned periods, fragsize;
155 snd_pcm_uframes_t buffer_size;
158 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
159 fprintf(stderr, __FILE__": failed to parse module arguments\n");
163 ss = c->default_sample_spec;
164 if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
165 fprintf(stderr, __FILE__": failed to parse sample specification\n");
168 frame_size = pa_sample_size(&ss);
172 if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
173 fprintf(stderr, __FILE__": failed to parse buffer metrics\n");
176 buffer_size = fragsize/frame_size*periods;
178 u = malloc(sizeof(struct userdata));
180 memset(u, 0, sizeof(struct userdata));
183 if (snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) {
184 fprintf(stderr, __FILE__": Error opening PCM device %s\n", dev);
188 if (pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &buffer_size) < 0) {
189 fprintf(stderr, __FILE__": Failed to set hardware parameters\n");
193 u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss);
196 u->sink->get_latency = sink_get_latency_cb;
197 u->sink->userdata = u;
198 pa_sink_set_owner(u->sink, m);
199 u->sink->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
201 if (pa_create_io_sources(u->pcm_handle, c->mainloop, &u->io_sources, &u->n_io_sources, io_callback, u) < 0) {
202 fprintf(stderr, __FILE__": failed to obtain file descriptors\n");
206 u->frame_size = frame_size;
207 u->fragment_size = buffer_size*u->frame_size/periods;
209 fprintf(stderr, __FILE__": using %u fragments of size %u bytes.\n", periods, u->fragment_size);
211 u->silence.memblock = pa_memblock_new(u->silence.length = u->fragment_size);
212 assert(u->silence.memblock);
213 pa_silence_memblock(u->silence.memblock, &ss);
214 u->silence.index = 0;
216 u->memchunk.memblock = NULL;
217 u->memchunk.index = u->memchunk.length = 0;
230 pa_module_done(c, m);
235 void pa_module_done(struct pa_core *c, struct pa_module*m) {
239 if ((u = m->userdata)) {
241 pa_sink_free(u->sink);
244 pa_free_io_sources(c->mainloop, u->io_sources, u->n_io_sources);
247 snd_pcm_drop(u->pcm_handle);
248 snd_pcm_close(u->pcm_handle);
251 if (u->memchunk.memblock)
252 pa_memblock_unref(u->memchunk.memblock);
253 if (u->silence.memblock)
254 pa_memblock_unref(u->silence.memblock);