--- /dev/null
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2008 Lennart Poettering
+
+ 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 <sys/ioctl.h>
+#include <sys/poll.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/timeval.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/source.h>
+#include <pulsecore/module.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/rtclock.h>
+
+#include "module-sine-source-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Sine wave generator source");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+ "rate=<sample rate> "
+ "source_name=<name for the source> "
+ "frequency=<frequency in Hz>");
+
+#define DEFAULT_SOURCE_NAME "sine_input"
+#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;
+
+ pa_memchunk memchunk;
+ size_t peek_index;
+
+ pa_usec_t block_usec; /* how much to push at once */
+ pa_usec_t timestamp; /* when to push next */
+};
+
+static const char* const valid_modargs[] = {
+ "rate",
+ "source_name",
+ "frequency",
+ 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_SINK_MESSAGE_SET_STATE:
+
+ if (PA_PTR_TO_UINT(data) == PA_SINK_RUNNING)
+ u->timestamp = pa_rtclock_usec();
+
+ break;
+
+ case PA_SOURCE_MESSAGE_GET_LATENCY: {
+ pa_usec_t now, left_to_fill;
+
+ now = pa_rtclock_usec();
+ left_to_fill = u->timestamp > now ? u->timestamp - now : 0ULL;
+
+ *((pa_usec_t*) data) = u->block_usec > left_to_fill ? u->block_usec - left_to_fill : 0ULL;
+
+ 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);
+ pa_assert_se(u = s->userdata);
+
+ u->block_usec = pa_source_get_requested_latency_within_thread(s);
+
+ if (u->block_usec == (pa_usec_t) -1)
+ u->block_usec = s->thread_info.max_latency;
+
+ pa_log("new block msec = %lu", (unsigned long) (u->block_usec / PA_USEC_PER_MSEC));
+}
+
+static void process_render(struct userdata *u, pa_usec_t now) {
+ pa_assert(u);
+
+ while (u->timestamp < now + u->block_usec) {
+ pa_memchunk chunk;
+ size_t k;
+
+ k = pa_usec_to_bytes_round_up(now + u->block_usec - u->timestamp, &u->source->sample_spec);
+
+ chunk.memblock = u->memchunk.memblock;
+ chunk.index = u->peek_index;
+ chunk.length = PA_MIN(u->memchunk.length - u->peek_index, k);
+
+ pa_log_debug("posting %lu", (unsigned long) chunk.length);
+ pa_source_post(u->source, &chunk);
+ pa_memchunk_dump_to_file(&chunk, "sine");
+
+ u->peek_index += chunk.length;
+ while (u->peek_index >= u->memchunk.length)
+ u->peek_index -= u->memchunk.length;
+
+ u->timestamp += pa_bytes_to_usec(chunk.length, &u->source->sample_spec);
+ }
+}
+
+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);
+ pa_rtpoll_install(u->rtpoll);
+
+ u->timestamp = pa_rtclock_usec();
+
+ for (;;) {
+ int ret;
+
+ if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
+ pa_usec_t now;
+
+ now = pa_rtclock_usec();
+
+ if (u->timestamp <= now)
+ process_render(u, now);
+
+ pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp);
+ } 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");
+}
+
+static void calc_sine(float *f, size_t l, double freq) {
+ size_t i;
+
+ l /= sizeof(float);
+
+ for (i = 0; i < l; i++)
+ f[i] = (float) sin((double) i/(double)l*M_PI*2*freq)/2;
+}
+
+int pa__init(pa_module*m) {
+ struct userdata *u;
+ pa_modargs *ma;
+ pa_source_new_data data;
+ uint32_t frequency;
+ pa_sample_spec ss;
+ void *p;
+
+ pa_assert(m);
+
+ if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+ pa_log("failed to parse module arguments.");
+ goto fail;
+ }
+
+ ss.format = PA_SAMPLE_FLOAT32;
+ ss.channels = 1;
+ ss.rate = 44100;
+
+ if (pa_modargs_get_value_u32(ma, "rate", &ss.rate) < 0 || ss.rate <= 1) {
+ pa_log("Invalid rate specification");
+ goto fail;
+ }
+
+ frequency = 440;
+ if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
+ pa_log("Invalid frequency specification");
+ 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);
+
+ u->peek_index = 0;
+ pa_memchunk_reset(&u->memchunk);
+ u->memchunk.memblock = pa_memblock_new(m->core->mempool, (size_t) -1);
+ u->memchunk.length = pa_frame_align(pa_memblock_get_length(u->memchunk.memblock), &ss);
+
+ p = pa_memblock_acquire(u->memchunk.memblock);
+ calc_sine(p, u->memchunk.length,
+ (double) frequency * (double) pa_bytes_to_usec(u->memchunk.length, &ss) / (double) PA_USEC_PER_SEC);
+ pa_memblock_release(u->memchunk.memblock);
+
+ 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_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Sine source at %u Hz", (unsigned) frequency);
+ pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
+ pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency);
+ pa_source_new_data_set_sample_spec(&data, &ss);
+
+ u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY);
+ pa_source_new_data_done(&data);
+
+ if (!u->source) {
+ pa_log("Failed to create source.");
+ goto fail;
+ }
+
+ 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, (pa_usec_t) -1, MAX_LATENCY_USEC);
+ u->block_usec = u->source->thread_info.max_latency;
+
+ if (!(u->thread = pa_thread_new(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->memchunk.memblock)
+ pa_memblock_unref(u->memchunk.memblock);
+
+ if (u->rtpoll)
+ pa_rtpoll_free(u->rtpoll);
+
+ pa_xfree(u);
+}