1 files changed, 150 insertions, 0 deletions
diff --git a/src/modules/module-null-sink.c b/src/modules/module-null-sink.c
new file mode 100644
index 00000000..5731a403
--- /dev/null
+++ b/src/modules/module-null-sink.c
@@ -0,0 +1,150 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio 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.
+ 
+  polypaudio 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 polypaudio; 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 <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include <polypcore/iochannel.h>
+#include <polypcore/sink.h>
+#include <polypcore/module.h>
+#include <polypcore/util.h>
+#include <polypcore/modargs.h>
+#include <polypcore/xmalloc.h>
+#include <polypcore/log.h>
+
+#include "module-null-sink-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering")
+PA_MODULE_DESCRIPTION("Clocked NULL sink")
+PA_MODULE_VERSION(PACKAGE_VERSION)
+PA_MODULE_USAGE("format=<sample format> channels=<number of channels> rate=<sample rate> sink_name=<name of sink>")
+
+#define DEFAULT_SINK_NAME "null"
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    pa_sink *sink;
+    pa_time_event *time_event;
+    size_t block_size;
+};
+
+static const char* const valid_modargs[] = {
+    "rate",
+    "format",
+    "channels",
+    "sink_name",
+    NULL
+};
+
+static void time_callback(pa_mainloop_api *m, pa_time_event*e, const struct timeval *tv, void *userdata) {
+    struct userdata *u = userdata;
+    pa_memchunk chunk;
+    struct timeval ntv = *tv;
+    size_t l;
+
+    assert(u);
+
+    if (pa_sink_render(u->sink, u->block_size, &chunk) >= 0) {
+        l = chunk.length;
+        pa_memblock_unref(chunk.memblock);
+    } else
+        l = u->block_size;
+
+    pa_timeval_add(&ntv, pa_bytes_to_usec(l, &u->sink->sample_spec));
+    m->time_restart(e, &ntv);
+}
+
+int pa__init(pa_core *c, pa_module*m) {
+    struct userdata *u = NULL;
+    pa_sample_spec ss;
+    pa_modargs *ma = NULL;
+    struct timeval tv;
+    assert(c && m);
+    
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log(__FILE__": failed to parse module arguments.\n");
+        goto fail;
+    }
+
+    ss = c->default_sample_spec;
+    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
+        pa_log(__FILE__": invalid sample format specification.\n");
+        goto fail;
+    }
+    
+    u = pa_xmalloc0(sizeof(struct userdata));
+    u->core = c;
+    u->module = m;
+    m->userdata = u;
+    
+    if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, NULL))) {
+        pa_log(__FILE__": failed to create sink.\n");
+        goto fail;
+    }
+    
+    u->sink->userdata = u;
+    pa_sink_set_owner(u->sink, m);
+    u->sink->description = pa_sprintf_malloc("NULL sink");
+
+    pa_gettimeofday(&tv);
+    u->time_event = c->mainloop->time_new(c->mainloop, &tv, time_callback, u);
+
+    u->block_size = pa_bytes_per_second(&ss) / 10;
+    
+    pa_modargs_free(ma);
+    
+    return 0;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+        
+    pa__done(c, m);
+
+    return -1;
+}
+
+void pa__done(pa_core *c, pa_module*m) {
+    struct userdata *u;
+    assert(c && m);
+
+    if (!(u = m->userdata))
+        return;
+    
+    pa_sink_disconnect(u->sink);
+    pa_sink_unref(u->sink);
+
+    u->core->mainloop->time_free(u->time_event);
+
+    pa_xfree(u);
+}