--- /dev/null
+/* $Id$ */
+
+/***
+ This file is part of polypaudio.
+
+ polypaudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU 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 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 "sink-input.h"
+#include "module.h"
+#include "modargs.h"
+#include "xmalloc.h"
+#include "namereg.h"
+
+struct userdata {
+ struct pa_core *core;
+ struct pa_sink_input *sink_input;
+ struct pa_memblock *memblock;
+ size_t peek_index;
+};
+
+static const char* const valid_modargs[] = {
+ "sink",
+ "frequency",
+ NULL,
+};
+
+static int sink_input_peek(struct pa_sink_input *i, struct 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(struct pa_sink_input *i, const struct 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(struct pa_sink_input *i) {
+ struct userdata *u;
+ assert(i && i->userdata);
+ u = i->userdata;
+
+ pa_sink_input_free(u->sink_input);
+ u->sink_input = NULL;
+}
+
+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_module_init(struct pa_core *c, struct pa_module*m) {
+ struct pa_modargs *ma = NULL;
+ struct userdata *u;
+ struct pa_sink *sink;
+ const char *sink_name;
+ struct pa_sample_spec ss;
+ uint32_t frequency;
+ char t[256];
+
+ if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+ fprintf(stderr, __FILE__": Failed to parse module arguments\n");
+ goto fail;
+ }
+
+ m->userdata = u = pa_xmalloc(sizeof(struct userdata));
+ u->core = c;
+ 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))) {
+ fprintf(stderr, __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) {
+ fprintf(stderr, __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, t, &ss)))
+ 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_module_done(c, m);
+ return -1;
+}
+
+void pa_module_done(struct pa_core *c, struct pa_module*m) {
+ struct userdata *u = m->userdata;
+ assert(c && m);
+
+ if (!u)
+ return;
+
+ if (u->sink_input)
+ pa_sink_input_free(u->sink_input);
+ if (u->memblock)
+ pa_memblock_unref(u->memblock);
+ pa_xfree(u);
+}