[pulseaudio-discuss] [PATCH] module: new null-source module
Tanu Kaskinen
tanu.kaskinen at digia.com
Wed Apr 27 04:50:00 PDT 2011
From: Marc-André Lureau <marcandre.lureau at gmail.com>
---
src/Makefile.am | 6 +
src/modules/module-null-source.c | 294 ++++++++++++++++++++++++++++++++++++++
2 files changed, 300 insertions(+), 0 deletions(-)
create mode 100644 src/modules/module-null-source.c
diff --git a/src/Makefile.am b/src/Makefile.am
index fb846cd..275334d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1024,6 +1024,7 @@ modlibexec_LTLIBRARIES += \
module-simple-protocol-tcp.la \
module-null-sink.la \
module-sine-source.la \
+ module-null-source.la \
module-detect.la \
module-volume-restore.la \
module-device-manager.la \
@@ -1289,6 +1290,7 @@ SYMDEF_FILES = \
module-tunnel-source-symdef.h \
module-null-sink-symdef.h \
module-sine-source-symdef.h \
+ module-null-source-symdef.h \
module-esound-sink-symdef.h \
module-zeroconf-publish-symdef.h \
module-zeroconf-discover-symdef.h \
@@ -1481,6 +1483,10 @@ module_sine_source_la_SOURCES = modules/module-sine-source.c
module_sine_source_la_LDFLAGS = $(MODULE_LDFLAGS)
module_sine_source_la_LIBADD = $(MODULE_LIBADD)
+module_null_source_la_SOURCES = modules/module-null-source.c
+module_null_source_la_LDFLAGS = $(MODULE_LDFLAGS)
+module_null_source_la_LIBADD = $(MODULE_LIBADD)
+
# Couplings
module_combine_la_SOURCES = modules/module-combine.c
diff --git a/src/modules/module-null-source.c b/src/modules/module-null-source.c
new file mode 100644
index 0000000..358ffc6
--- /dev/null
+++ b/src/modules/module-null-source.c
@@ -0,0 +1,294 @@
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2004-2008 Lennart Poettering
+ Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include <pulse/rtclock.h>
+#include <pulse/timeval.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/core-rtclock.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/module.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/source.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/thread.h>
+
+#include "module-null-source-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering & Marc-Andre Lureau");
+PA_MODULE_DESCRIPTION("Clocked NULL source");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+ "format=<sample format> "
+ "channels=<number of channels> "
+ "rate=<sample rate> "
+ "source_name=<name of source> "
+ "channel_map=<channel map> "
+ "description=<description for the source> "
+ "latency_time=<latency time in ms>");
+
+#define DEFAULT_SOURCE_NAME "source.null"
+#define DEFAULT_LATENCY_TIME 20
+#define MAX_LATENCY_USEC (PA_USEC_PER_SEC * 2)
+
+struct userdata {
+ pa_core *core;
+ pa_module *module;
+ pa_source *source;
+
+ pa_thread *thread;
+ pa_thread_mq thread_mq;
+ pa_rtpoll *rtpoll;
+
+ size_t block_size;
+
+ pa_usec_t block_usec;
+ pa_usec_t timestamp;
+ pa_usec_t latency_time;
+};
+
+static const char* const valid_modargs[] = {
+ "rate",
+ "format",
+ "channels",
+ "source_name",
+ "channel_map",
+ "description",
+ "latency_time",
+ NULL
+};
+
+static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+ struct userdata *u = PA_SOURCE(o)->userdata;
+
+ switch (code) {
+ case PA_SOURCE_MESSAGE_SET_STATE:
+
+ if (PA_PTR_TO_UINT(data) == PA_SOURCE_RUNNING)
+ u->timestamp = pa_rtclock_now();
+
+ break;
+
+ case PA_SOURCE_MESSAGE_GET_LATENCY: {
+ pa_usec_t now;
+
+ now = pa_rtclock_now();
+ *((pa_usec_t*) data) = u->timestamp > now ? u->timestamp - now : 0;
+
+ return 0;
+ }
+ }
+
+ return pa_source_process_msg(o, code, data, offset, chunk);
+}
+
+static void source_update_requested_latency_cb(pa_source *s) {
+ struct userdata *u;
+
+ pa_source_assert_ref(s);
+ u = s->userdata;
+ pa_assert(u);
+
+ u->block_usec = pa_source_get_requested_latency_within_thread(s);
+}
+
+static void thread_func(void *userdata) {
+ struct userdata *u = userdata;
+
+ pa_assert(u);
+
+ pa_log_debug("Thread starting up");
+
+ pa_thread_mq_install(&u->thread_mq);
+
+ u->timestamp = pa_rtclock_now();
+
+ for (;;) {
+ int ret;
+
+ /* Generate some null data */
+ if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
+ pa_usec_t now;
+ pa_memchunk chunk;
+
+ now = pa_rtclock_now();
+
+ if ((chunk.length = pa_usec_to_bytes(now - u->timestamp, &u->source->sample_spec)) > 0) {
+
+ chunk.memblock = pa_memblock_new(u->core->mempool, (size_t) -1); /* or chunk.length? */
+ chunk.index = 0;
+ pa_source_post(u->source, &chunk);
+ pa_memblock_unref(chunk.memblock);
+
+ u->timestamp = now;
+ }
+
+ pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp + u->latency_time * PA_USEC_PER_MSEC);
+ } else
+ pa_rtpoll_set_timer_disabled(u->rtpoll);
+
+ /* Hmm, nothing to do. Let's sleep */
+ if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
+ goto fail;
+
+ if (ret == 0)
+ goto finish;
+ }
+
+fail:
+ /* If this was no regular exit from the loop we have to continue
+ * processing messages until we received PA_MESSAGE_SHUTDOWN */
+ pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+ pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+ pa_log_debug("Thread shutting down");
+}
+
+int pa__init(pa_module*m) {
+ struct userdata *u = NULL;
+ pa_sample_spec ss;
+ pa_channel_map map;
+ pa_modargs *ma = NULL;
+ pa_source_new_data data;
+ uint32_t latency_time = DEFAULT_LATENCY_TIME;
+
+ pa_assert(m);
+
+ if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+ pa_log("Failed to parse module arguments.");
+ goto fail;
+ }
+
+ ss = m->core->default_sample_spec;
+ if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
+ pa_log("Invalid sample format specification or channel map");
+ goto fail;
+ }
+
+ m->userdata = u = pa_xnew0(struct userdata, 1);
+ u->core = m->core;
+ u->module = m;
+ u->rtpoll = pa_rtpoll_new();
+ pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
+
+ pa_source_new_data_init(&data);
+ data.driver = __FILE__;
+ data.module = m;
+ pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
+ pa_source_new_data_set_sample_spec(&data, &ss);
+ pa_source_new_data_set_channel_map(&data, &map);
+ pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, pa_modargs_get_value(ma, "description", "Null Input"));
+ pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
+
+ u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY | PA_SOURCE_DYNAMIC_LATENCY);
+ pa_source_new_data_done(&data);
+
+ if (!u->source) {
+ pa_log("Failed to create source object.");
+ goto fail;
+ }
+
+ u->latency_time = DEFAULT_LATENCY_TIME;
+ if (pa_modargs_get_value_u32(ma, "latency_time", &latency_time) < 0) {
+ pa_log("Failed to parse latency_time value.");
+ goto fail;
+ }
+ u->latency_time = latency_time;
+
+ u->source->parent.process_msg = source_process_msg;
+ u->source->update_requested_latency = source_update_requested_latency_cb;
+ u->source->userdata = u;
+
+ pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
+ pa_source_set_rtpoll(u->source, u->rtpoll);
+
+ pa_source_set_latency_range(u->source, 0, MAX_LATENCY_USEC);
+ u->block_usec = u->source->thread_info.max_latency;
+
+ u->source->thread_info.max_rewind =
+ pa_usec_to_bytes(u->block_usec, &u->source->sample_spec);
+
+ if (!(u->thread = pa_thread_new("null-source", thread_func, u))) {
+ pa_log("Failed to create thread.");
+ goto fail;
+ }
+
+ pa_source_put(u->source);
+
+ pa_modargs_free(ma);
+
+ return 0;
+
+fail:
+ if (ma)
+ pa_modargs_free(ma);
+
+ pa__done(m);
+
+ return -1;
+}
+
+void pa__done(pa_module*m) {
+ struct userdata *u;
+
+ pa_assert(m);
+
+ if (!(u = m->userdata))
+ return;
+
+ if (u->source)
+ pa_source_unlink(u->source);
+
+ if (u->thread) {
+ pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+ pa_thread_free(u->thread);
+ }
+
+ pa_thread_mq_done(&u->thread_mq);
+
+ if (u->source)
+ pa_source_unref(u->source);
+
+ if (u->rtpoll)
+ pa_rtpoll_free(u->rtpoll);
+
+ pa_xfree(u);
+}
--
1.7.4.2
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