diff options
Diffstat (limited to 'src/modules/module-sine.c')
| -rw-r--r-- | src/modules/module-sine.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/modules/module-sine.c b/src/modules/module-sine.c new file mode 100644 index 0000000..656a692 --- /dev/null +++ b/src/modules/module-sine.c @@ -0,0 +1,209 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 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 2.1 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, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> + +#include <pulse/xmalloc.h> + +#include <pulsecore/sink-input.h> +#include <pulsecore/module.h> +#include <pulsecore/modargs.h> +#include <pulsecore/namereg.h> +#include <pulsecore/log.h> + +PA_MODULE_AUTHOR("Lennart Poettering"); +PA_MODULE_DESCRIPTION("Sine wave generator"); +PA_MODULE_VERSION(PACKAGE_VERSION); +PA_MODULE_LOAD_ONCE(false); +PA_MODULE_USAGE( + "sink=<sink to connect to> " + "rate=<sample rate> " + "frequency=<frequency in Hz>"); + +struct userdata { + pa_core *core; + pa_module *module; + pa_sink_input *sink_input; + pa_memchunk memchunk; + size_t peek_index; +}; + +static const char* const valid_modargs[] = { + "sink", + "rate", + "frequency", + NULL, +}; + +static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) { + struct userdata *u; + + pa_sink_input_assert_ref(i); + pa_assert_se(u = i->userdata); + pa_assert(chunk); + + *chunk = u->memchunk; + pa_memblock_ref(chunk->memblock); + + chunk->index += u->peek_index; + chunk->length -= u->peek_index; + + u->peek_index = 0; + + return 0; +} + +static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) { + struct userdata *u; + + pa_sink_input_assert_ref(i); + pa_assert_se(u = i->userdata); + + nbytes %= u->memchunk.length; + + if (u->peek_index >= nbytes) + u->peek_index -= nbytes; + else + u->peek_index = u->memchunk.length + u->peek_index - nbytes; +} + +static void sink_input_kill_cb(pa_sink_input *i) { + struct userdata *u; + + pa_sink_input_assert_ref(i); + pa_assert_se(u = i->userdata); + + pa_sink_input_unlink(u->sink_input); + pa_sink_input_unref(u->sink_input); + u->sink_input = NULL; + + pa_module_unload_request(u->module, true); +} + +/* Called from IO thread context */ +static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) { + struct userdata *u; + + pa_sink_input_assert_ref(i); + pa_assert_se(u = i->userdata); + + /* If we are added for the first time, ask for a rewinding so that + * we are heard right-away. */ + if (PA_SINK_INPUT_IS_LINKED(state) && + i->thread_info.state == PA_SINK_INPUT_INIT && i->sink) + pa_sink_input_request_rewind(i, 0, false, true, true); +} + +int pa__init(pa_module*m) { + pa_modargs *ma = NULL; + struct userdata *u; + pa_sink *sink; + pa_sample_spec ss; + uint32_t frequency; + pa_sink_input_new_data data; + + if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { + pa_log("Failed to parse module arguments"); + goto fail; + } + + if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK))) { + pa_log("No such sink."); + goto fail; + } + + ss.format = PA_SAMPLE_FLOAT32; + ss.rate = sink->sample_spec.rate; + ss.channels = 1; + + if (pa_modargs_get_sample_rate(ma, &ss.rate) < 0) { + 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->sink_input = NULL; + + u->peek_index = 0; + pa_memchunk_sine(&u->memchunk, m->core->mempool, ss.rate, frequency); + + pa_sink_input_new_data_init(&data); + data.driver = __FILE__; + data.module = m; + pa_sink_input_new_data_set_sink(&data, sink, false, true); + pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, "%u Hz Sine", frequency); + pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "abstract"); + pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency); + pa_sink_input_new_data_set_sample_spec(&data, &ss); + + pa_sink_input_new(&u->sink_input, m->core, &data); + pa_sink_input_new_data_done(&data); + + if (!u->sink_input) + goto fail; + + u->sink_input->pop = sink_input_pop_cb; + u->sink_input->process_rewind = sink_input_process_rewind_cb; + u->sink_input->kill = sink_input_kill_cb; + u->sink_input->state_change = sink_input_state_change_cb; + u->sink_input->userdata = u; + + pa_sink_input_put(u->sink_input); + + 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->sink_input) { + pa_sink_input_unlink(u->sink_input); + pa_sink_input_unref(u->sink_input); + } + + if (u->memchunk.memblock) + pa_memblock_unref(u->memchunk.memblock); + + pa_xfree(u); +} |