2 This file is part of PulseAudio.
4 Copyright 2004-2008 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio 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 Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
35 #include <pulse/timeval.h>
36 #include <pulse/xmalloc.h>
38 #include <pulsecore/macro.h>
39 #include <pulsecore/sink.h>
40 #include <pulsecore/module.h>
41 #include <pulsecore/core-util.h>
42 #include <pulsecore/core-error.h>
43 #include <pulsecore/modargs.h>
44 #include <pulsecore/log.h>
45 #include <pulsecore/thread.h>
46 #include <pulsecore/thread-mq.h>
47 #include <pulsecore/rtpoll.h>
48 #include <pulsecore/rtclock.h>
50 #include "module-null-sink-symdef.h"
52 PA_MODULE_AUTHOR("Lennart Poettering");
53 PA_MODULE_DESCRIPTION("Clocked NULL sink");
54 PA_MODULE_VERSION(PACKAGE_VERSION);
55 PA_MODULE_LOAD_ONCE(FALSE);
57 "format=<sample format> "
58 "channels=<number of channels> "
60 "sink_name=<name of sink> "
61 "channel_map=<channel map> "
62 "description=<description for the sink>");
64 #define DEFAULT_SINK_NAME "null"
65 #define BLOCK_USEC (PA_USEC_PER_SEC * 2)
73 pa_thread_mq thread_mq;
80 static const char* const valid_modargs[] = {
90 static int sink_process_msg(
97 struct userdata *u = PA_SINK(o)->userdata;
100 case PA_SINK_MESSAGE_SET_STATE:
102 if (PA_PTR_TO_UINT(data) == PA_SINK_RUNNING)
103 u->timestamp = pa_rtclock_usec();
107 case PA_SINK_MESSAGE_GET_LATENCY: {
110 now = pa_rtclock_usec();
111 *((pa_usec_t*) data) = u->timestamp > now ? u->timestamp - now : 0ULL;
117 return pa_sink_process_msg(o, code, data, offset, chunk);
120 static void sink_update_requested_latency_cb(pa_sink *s) {
124 pa_sink_assert_ref(s);
125 pa_assert_se(u = s->userdata);
127 u->block_usec = pa_sink_get_requested_latency_within_thread(s);
129 if (u->block_usec == (pa_usec_t) -1)
130 u->block_usec = s->thread_info.max_latency;
132 nbytes = pa_usec_to_bytes(u->block_usec, &s->sample_spec);
133 pa_sink_set_max_rewind_within_thread(s, nbytes);
134 pa_sink_set_max_request_within_thread(s, nbytes);
137 static void process_rewind(struct userdata *u, pa_usec_t now) {
138 size_t rewind_nbytes, in_buffer;
143 /* Figure out how much we shall rewind and reset the counter */
144 rewind_nbytes = u->sink->thread_info.rewind_nbytes;
145 u->sink->thread_info.rewind_nbytes = 0;
147 pa_assert(rewind_nbytes > 0);
148 pa_log_debug("Requested to rewind %lu bytes.", (unsigned long) rewind_nbytes);
150 if (u->timestamp <= now)
153 delay = u->timestamp - now;
154 in_buffer = pa_usec_to_bytes(delay, &u->sink->sample_spec);
159 if (rewind_nbytes > in_buffer)
160 rewind_nbytes = in_buffer;
162 pa_sink_process_rewind(u->sink, rewind_nbytes);
163 u->timestamp -= pa_bytes_to_usec(rewind_nbytes, &u->sink->sample_spec);
165 pa_log_debug("Rewound %lu bytes.", (unsigned long) rewind_nbytes);
170 pa_sink_process_rewind(u->sink, 0);
173 static void process_render(struct userdata *u, pa_usec_t now) {
178 /* This is the configured latency. Sink inputs connected to us
179 might not have a single frame more than the maxrequest value
180 queed. Hence: at maximum read this many bytes from the sink
183 /* Fill the buffer up the the latency size */
184 while (u->timestamp < now + u->block_usec) {
187 pa_sink_render(u->sink, u->sink->thread_info.max_request, &chunk);
188 pa_memblock_unref(chunk.memblock);
190 /* pa_log_debug("Ate %lu bytes.", (unsigned long) chunk.length); */
191 u->timestamp += pa_bytes_to_usec(chunk.length, &u->sink->sample_spec);
195 if (ate >= u->sink->thread_info.max_request)
199 /* pa_log_debug("Ate in sum %lu bytes (of %lu)", (unsigned long) ate, (unsigned long) nbytes); */
202 static void thread_func(void *userdata) {
203 struct userdata *u = userdata;
207 pa_log_debug("Thread starting up");
209 pa_thread_mq_install(&u->thread_mq);
210 pa_rtpoll_install(u->rtpoll);
212 u->timestamp = pa_rtclock_usec();
217 /* Render some data and drop it immediately */
218 if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
221 now = pa_rtclock_usec();
223 if (u->sink->thread_info.rewind_requested) {
224 if (u->sink->thread_info.rewind_nbytes > 0)
225 process_rewind(u, now);
227 pa_sink_process_rewind(u->sink, 0);
230 if (u->timestamp <= now)
231 process_render(u, now);
233 pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp);
235 pa_rtpoll_set_timer_disabled(u->rtpoll);
237 /* Hmm, nothing to do. Let's sleep */
238 if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
246 /* If this was no regular exit from the loop we have to continue
247 * processing messages until we received PA_MESSAGE_SHUTDOWN */
248 pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
249 pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
252 pa_log_debug("Thread shutting down");
255 int pa__init(pa_module*m) {
256 struct userdata *u = NULL;
259 pa_modargs *ma = NULL;
260 pa_sink_new_data data;
265 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
266 pa_log("Failed to parse module arguments.");
270 ss = m->core->default_sample_spec;
271 map = m->core->default_channel_map;
272 if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
273 pa_log("Invalid sample format specification or channel map");
277 m->userdata = u = pa_xnew0(struct userdata, 1);
280 u->rtpoll = pa_rtpoll_new();
281 pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
283 pa_sink_new_data_init(&data);
284 data.driver = __FILE__;
286 pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
287 pa_sink_new_data_set_sample_spec(&data, &ss);
288 pa_sink_new_data_set_channel_map(&data, &map);
289 pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, pa_modargs_get_value(ma, "description", "Null Output"));
290 pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
292 u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY);
293 pa_sink_new_data_done(&data);
296 pa_log("Failed to create sink object.");
300 u->sink->parent.process_msg = sink_process_msg;
301 u->sink->update_requested_latency = sink_update_requested_latency_cb;
302 u->sink->userdata = u;
304 pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
305 pa_sink_set_rtpoll(u->sink, u->rtpoll);
307 u->block_usec = BLOCK_USEC;
308 nbytes = pa_usec_to_bytes(u->block_usec, &u->sink->sample_spec);
309 pa_sink_set_max_rewind(u->sink, nbytes);
310 pa_sink_set_max_request(u->sink, nbytes);
312 if (!(u->thread = pa_thread_new(thread_func, u))) {
313 pa_log("Failed to create thread.");
317 pa_sink_put(u->sink);
332 int pa__get_n_used(pa_module *m) {
336 pa_assert_se(u = m->userdata);
338 return pa_sink_linked_by(u->sink);
341 void pa__done(pa_module*m) {
346 if (!(u = m->userdata))
350 pa_sink_unlink(u->sink);
353 pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
354 pa_thread_free(u->thread);
357 pa_thread_mq_done(&u->thread_mq);
360 pa_sink_unref(u->sink);
363 pa_rtpoll_free(u->rtpoll);