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Add new test source module-sine-source
This commit is contained in:
Lennart Poettering
parent
e5c093897e
commit
9fc726c6d7
2 changed files with 341 additions and 0 deletions
335
src/modules/module-sine-source.c
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335
src/modules/module-sine-source.c
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/***
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This file is part of PulseAudio.
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Copyright 2008 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <pulse/xmalloc.h>
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#include <pulse/timeval.h>
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#include <pulsecore/core-error.h>
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#include <pulsecore/source.h>
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#include <pulsecore/module.h>
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#include <pulsecore/core-util.h>
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#include <pulsecore/modargs.h>
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#include <pulsecore/log.h>
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#include <pulsecore/thread.h>
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#include <pulsecore/thread-mq.h>
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#include <pulsecore/rtpoll.h>
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#include <pulsecore/rtclock.h>
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#include "module-sine-source-symdef.h"
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PA_MODULE_AUTHOR("Lennart Poettering");
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PA_MODULE_DESCRIPTION("Sine wave generator source");
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PA_MODULE_VERSION(PACKAGE_VERSION);
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PA_MODULE_LOAD_ONCE(FALSE);
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PA_MODULE_USAGE(
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"rate=<sample rate> "
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"source_name=<name for the source> "
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"frequency=<frequency in Hz>");
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#define DEFAULT_SOURCE_NAME "sine_input"
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#define MAX_LATENCY_USEC (PA_USEC_PER_SEC * 2)
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struct userdata {
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pa_core *core;
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pa_module *module;
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pa_source *source;
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pa_thread *thread;
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pa_thread_mq thread_mq;
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pa_rtpoll *rtpoll;
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pa_memchunk memchunk;
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size_t peek_index;
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pa_usec_t block_usec; /* how much to push at once */
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pa_usec_t timestamp; /* when to push next */
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};
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static const char* const valid_modargs[] = {
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"rate",
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"source_name",
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"frequency",
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NULL
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};
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static int source_process_msg(
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pa_msgobject *o,
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int code,
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void *data,
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int64_t offset,
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pa_memchunk *chunk) {
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struct userdata *u = PA_SOURCE(o)->userdata;
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switch (code) {
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case PA_SINK_MESSAGE_SET_STATE:
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if (PA_PTR_TO_UINT(data) == PA_SINK_RUNNING)
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u->timestamp = pa_rtclock_usec();
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break;
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case PA_SOURCE_MESSAGE_GET_LATENCY: {
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pa_usec_t now, left_to_fill;
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now = pa_rtclock_usec();
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left_to_fill = u->timestamp > now ? u->timestamp - now : 0ULL;
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*((pa_usec_t*) data) = u->block_usec > left_to_fill ? u->block_usec - left_to_fill : 0ULL;
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return 0;
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}
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}
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return pa_source_process_msg(o, code, data, offset, chunk);
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}
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static void source_update_requested_latency_cb(pa_source *s) {
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struct userdata *u;
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pa_source_assert_ref(s);
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pa_assert_se(u = s->userdata);
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u->block_usec = pa_source_get_requested_latency_within_thread(s);
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if (u->block_usec == (pa_usec_t) -1)
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u->block_usec = s->thread_info.max_latency;
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pa_log("new block msec = %lu", (unsigned long) (u->block_usec / PA_USEC_PER_MSEC));
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}
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static void process_render(struct userdata *u, pa_usec_t now) {
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pa_assert(u);
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while (u->timestamp < now + u->block_usec) {
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pa_memchunk chunk;
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size_t k;
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k = pa_usec_to_bytes_round_up(now + u->block_usec - u->timestamp, &u->source->sample_spec);
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chunk.memblock = u->memchunk.memblock;
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chunk.index = u->peek_index;
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chunk.length = PA_MIN(u->memchunk.length - u->peek_index, k);
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pa_log_debug("posting %lu", (unsigned long) chunk.length);
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pa_source_post(u->source, &chunk);
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pa_memchunk_dump_to_file(&chunk, "sine");
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u->peek_index += chunk.length;
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while (u->peek_index >= u->memchunk.length)
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u->peek_index -= u->memchunk.length;
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u->timestamp += pa_bytes_to_usec(chunk.length, &u->source->sample_spec);
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}
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}
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static void thread_func(void *userdata) {
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struct userdata *u = userdata;
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pa_assert(u);
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pa_log_debug("Thread starting up");
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pa_thread_mq_install(&u->thread_mq);
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pa_rtpoll_install(u->rtpoll);
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u->timestamp = pa_rtclock_usec();
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for (;;) {
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int ret;
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if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
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pa_usec_t now;
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now = pa_rtclock_usec();
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if (u->timestamp <= now)
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process_render(u, now);
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pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp);
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} else
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pa_rtpoll_set_timer_disabled(u->rtpoll);
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/* Hmm, nothing to do. Let's sleep */
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if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
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goto fail;
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if (ret == 0)
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goto finish;
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}
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fail:
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/* If this was no regular exit from the loop we have to continue
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* processing messages until we received PA_MESSAGE_SHUTDOWN */
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pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
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pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
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finish:
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pa_log_debug("Thread shutting down");
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}
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static void calc_sine(float *f, size_t l, double freq) {
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size_t i;
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l /= sizeof(float);
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for (i = 0; i < l; i++)
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f[i] = (float) sin((double) i/(double)l*M_PI*2*freq)/2;
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}
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int pa__init(pa_module*m) {
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struct userdata *u;
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pa_modargs *ma;
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pa_source_new_data data;
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uint32_t frequency;
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pa_sample_spec ss;
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void *p;
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pa_assert(m);
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if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
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pa_log("failed to parse module arguments.");
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goto fail;
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}
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ss.format = PA_SAMPLE_FLOAT32;
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ss.channels = 1;
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ss.rate = 44100;
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if (pa_modargs_get_value_u32(ma, "rate", &ss.rate) < 0 || ss.rate <= 1) {
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pa_log("Invalid rate specification");
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goto fail;
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}
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frequency = 440;
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if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
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pa_log("Invalid frequency specification");
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goto fail;
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}
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m->userdata = u = pa_xnew0(struct userdata, 1);
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u->core = m->core;
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u->module = m;
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u->rtpoll = pa_rtpoll_new();
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pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
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u->peek_index = 0;
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pa_memchunk_reset(&u->memchunk);
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u->memchunk.memblock = pa_memblock_new(m->core->mempool, (size_t) -1);
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u->memchunk.length = pa_frame_align(pa_memblock_get_length(u->memchunk.memblock), &ss);
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p = pa_memblock_acquire(u->memchunk.memblock);
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calc_sine(p, u->memchunk.length,
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(double) frequency * (double) pa_bytes_to_usec(u->memchunk.length, &ss) / (double) PA_USEC_PER_SEC);
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pa_memblock_release(u->memchunk.memblock);
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pa_source_new_data_init(&data);
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data.driver = __FILE__;
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data.module = m;
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pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
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pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Sine source at %u Hz", (unsigned) frequency);
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pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
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pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency);
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pa_source_new_data_set_sample_spec(&data, &ss);
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u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY);
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pa_source_new_data_done(&data);
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if (!u->source) {
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pa_log("Failed to create source.");
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goto fail;
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}
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u->source->parent.process_msg = source_process_msg;
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u->source->update_requested_latency = source_update_requested_latency_cb;
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u->source->userdata = u;
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pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
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pa_source_set_rtpoll(u->source, u->rtpoll);
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pa_source_set_latency_range(u->source, (pa_usec_t) -1, MAX_LATENCY_USEC);
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u->block_usec = u->source->thread_info.max_latency;
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if (!(u->thread = pa_thread_new(thread_func, u))) {
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pa_log("Failed to create thread.");
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goto fail;
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}
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pa_source_put(u->source);
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pa_modargs_free(ma);
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return 0;
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fail:
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if (ma)
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pa_modargs_free(ma);
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pa__done(m);
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return -1;
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}
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void pa__done(pa_module*m) {
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struct userdata *u;
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pa_assert(m);
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if (!(u = m->userdata))
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return;
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if (u->source)
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pa_source_unlink(u->source);
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if (u->thread) {
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pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
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pa_thread_free(u->thread);
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}
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pa_thread_mq_done(&u->thread_mq);
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if (u->source)
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pa_source_unref(u->source);
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if (u->memchunk.memblock)
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pa_memblock_unref(u->memchunk.memblock);
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if (u->rtpoll)
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pa_rtpoll_free(u->rtpoll);
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pa_xfree(u);
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}
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