Reorganised the source tree. We now have src/ with a couple of subdirs:

* daemon/ - Contains the files specific to the polypaudio daemon.
 * modules/ - All loadable modules.
 * polyp/ - Files that are part of the public, application interface or
   are only used in libpolyp.
 * polypcore/ - All other shared files.
 * tests/ - Test programs.
 * utils/ - Utility programs.


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@487 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/modules/module-sine.c

@@ -0,0 +1,182 @@
+/* $Id$ */
+
+/***
+  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 <stdio.h>
+#include <assert.h>
+#include <math.h>
+
+#include <polypcore/sink-input.h>
+#include <polypcore/module.h>
+#include <polypcore/modargs.h>
+#include <polypcore/xmalloc.h>
+#include <polypcore/namereg.h>
+#include <polypcore/log.h>
+
+#include "module-sine-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering")
+PA_MODULE_DESCRIPTION("Sine wave generator")
+PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>")
+PA_MODULE_VERSION(PACKAGE_VERSION)
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    pa_sink_input *sink_input;
+    pa_memblock *memblock;
+    size_t peek_index;
+};
+
+static const char* const valid_modargs[] = {
+    "sink",
+    "frequency",
+    NULL,
+};
+
+static int sink_input_peek(pa_sink_input *i, pa_memchunk *chunk) {
+    struct userdata *u;
+    assert(i && chunk && i->userdata);
+    u = i->userdata;
+
+    chunk->memblock = pa_memblock_ref(u->memblock);
+    chunk->index = u->peek_index;
+    chunk->length = u->memblock->length - u->peek_index;
+    return 0;
+}
+
+static void sink_input_drop(pa_sink_input *i, const pa_memchunk *chunk, size_t length) {
+    struct userdata *u;
+    assert(i && chunk && length && i->userdata);
+    u = i->userdata;
+
+    assert(chunk->memblock == u->memblock && length <= u->memblock->length-u->peek_index);
+
+    u->peek_index += length;
+
+    if (u->peek_index >= u->memblock->length)
+        u->peek_index = 0;
+}
+
+static void sink_input_kill(pa_sink_input *i) {
+    struct userdata *u;
+    assert(i && i->userdata);
+    u = i->userdata;
+
+    pa_sink_input_disconnect(u->sink_input);
+    pa_sink_input_unref(u->sink_input);
+    u->sink_input = NULL;
+
+    pa_module_unload_request(u->module);
+}
+
+static void calc_sine(float *f, size_t l, float freq) {
+    size_t i;
+
+    l /= sizeof(float);
+    
+    for (i = 0; i < l; i++)
+        f[i] = (float) sin((double) i/l*M_PI*2*freq)/2;
+}
+
+int pa__init(pa_core *c, pa_module*m) {
+    pa_modargs *ma = NULL;
+    struct userdata *u;
+    pa_sink *sink;
+    const char *sink_name;
+    pa_sample_spec ss;
+    uint32_t frequency;
+    char t[256];
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log(__FILE__": Failed to parse module arguments\n");
+        goto fail;
+    }
+    
+    m->userdata = u = pa_xmalloc(sizeof(struct userdata));
+    u->core = c;
+    u->module = m;
+    u->sink_input = NULL;
+    u->memblock = NULL;
+
+    sink_name = pa_modargs_get_value(ma, "sink", NULL);
+
+    if (!(sink = pa_namereg_get(c, sink_name, PA_NAMEREG_SINK, 1))) {
+        pa_log(__FILE__": No such sink.\n");
+        goto fail;
+    }
+
+    ss.format = PA_SAMPLE_FLOAT32;
+    ss.rate = sink->sample_spec.rate;
+    ss.channels = 1;
+
+    frequency = 440;
+    if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
+        pa_log(__FILE__": Invalid frequency specification\n");
+        goto fail;
+    }
+    
+    u->memblock = pa_memblock_new(pa_bytes_per_second(&ss), c->memblock_stat);
+    calc_sine(u->memblock->data, u->memblock->length, frequency);
+
+    snprintf(t, sizeof(t), "Sine Generator at %u Hz", frequency);
+    if (!(u->sink_input = pa_sink_input_new(sink, __FILE__, t, &ss, NULL, 0, -1)))
+        goto fail;
+
+    u->sink_input->peek = sink_input_peek;
+    u->sink_input->drop = sink_input_drop;
+    u->sink_input->kill = sink_input_kill;
+    u->sink_input->userdata = u;
+    u->sink_input->owner = m;
+
+    u->peek_index = 0;
+    
+    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 = m->userdata;
+    assert(c && m);
+
+    if (!u)
+        return;
+
+    if (u->sink_input) {
+        pa_sink_input_disconnect(u->sink_input);
+        pa_sink_input_unref(u->sink_input);
+    }
+    
+    if (u->memblock)
+        pa_memblock_unref(u->memblock);
+    pa_xfree(u);
+}
+