diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Makefile.am | 6 | ||||
| -rw-r--r-- | src/modules/module-sine-source.c | 335 |
2 files changed, 341 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index b9d00831..bde51eb2 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -809,6 +809,7 @@ modlibexec_LTLIBRARIES += \ module-cli-protocol-tcp.la \ module-simple-protocol-tcp.la \ module-null-sink.la \ + module-sine-source.la \ module-detect.la \ module-volume-restore.la \ module-device-restore.la \ @@ -986,6 +987,7 @@ SYMDEF_FILES = \ modules/module-tunnel-sink-symdef.h \ modules/module-tunnel-source-symdef.h \ modules/module-null-sink-symdef.h \ + modules/module-sine-source-symdef.h \ modules/module-esound-sink-symdef.h \ modules/module-zeroconf-publish-symdef.h \ modules/module-zeroconf-discover-symdef.h \ @@ -1141,6 +1143,10 @@ module_null_sink_la_SOURCES = modules/module-null-sink.c module_null_sink_la_LDFLAGS = -module -avoid-version module_null_sink_la_LIBADD = $(AM_LIBADD) libpulsecore-@PA_MAJORMINORMICRO@.la libpulsecommon-@PA_MAJORMINORMICRO@.la libpulse.la +module_sine_source_la_SOURCES = modules/module-sine-source.c +module_sine_source_la_LDFLAGS = -module -avoid-version +module_sine_source_la_LIBADD = $(AM_LIBADD) libpulsecore-@PA_MAJORMINORMICRO@.la libpulsecommon-@PA_MAJORMINORMICRO@.la libpulse.la + # Couplings module_combine_la_SOURCES = modules/module-combine.c diff --git a/src/modules/module-sine-source.c b/src/modules/module-sine-source.c new file mode 100644 index 00000000..dcc34162 --- /dev/null +++ b/src/modules/module-sine-source.c @@ -0,0 +1,335 @@ +/*** + 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); +} |