diff options
Diffstat (limited to 'src/modules/module-tunnel-source-new.c')
| -rw-r--r-- | src/modules/module-tunnel-source-new.c | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/src/modules/module-tunnel-source-new.c b/src/modules/module-tunnel-source-new.c new file mode 100644 index 0000000..b41f53e --- /dev/null +++ b/src/modules/module-tunnel-source-new.c @@ -0,0 +1,627 @@ +/*** + This file is part of PulseAudio. + + Copyright 2013 Alexander Couzens + + 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 <pulse/context.h> +#include <pulse/timeval.h> +#include <pulse/xmalloc.h> +#include <pulse/stream.h> +#include <pulse/mainloop.h> +#include <pulse/introspect.h> +#include <pulse/error.h> + +#include <pulsecore/core.h> +#include <pulsecore/core-util.h> +#include <pulsecore/i18n.h> +#include <pulsecore/source.h> +#include <pulsecore/modargs.h> +#include <pulsecore/log.h> +#include <pulsecore/thread.h> +#include <pulsecore/thread-mq.h> +#include <pulsecore/poll.h> +#include <pulsecore/rtpoll.h> +#include <pulsecore/proplist-util.h> + +PA_MODULE_AUTHOR("Alexander Couzens"); +PA_MODULE_DESCRIPTION("Create a network source which connects via a stream to a remote PulseAudio server"); +PA_MODULE_VERSION(PACKAGE_VERSION); +PA_MODULE_LOAD_ONCE(false); +PA_MODULE_USAGE( + "server=<address> " + "source=<name of the remote source> " + "source_name=<name for the local source> " + "source_properties=<properties for the local source> " + "format=<sample format> " + "channels=<number of channels> " + "rate=<sample rate> " + "channel_map=<channel map> " + "cookie=<cookie file path>" + ); + +#define TUNNEL_THREAD_FAILED_MAINLOOP 1 + +static void stream_state_cb(pa_stream *stream, void *userdata); +static void stream_read_cb(pa_stream *s, size_t length, void *userdata); +static void context_state_cb(pa_context *c, void *userdata); +static void source_update_requested_latency_cb(pa_source *s); + +struct userdata { + pa_module *module; + pa_source *source; + pa_thread *thread; + pa_thread_mq *thread_mq; + pa_mainloop *thread_mainloop; + pa_mainloop_api *thread_mainloop_api; + + pa_context *context; + pa_stream *stream; + pa_rtpoll *rtpoll; + + bool update_stream_bufferattr_after_connect; + bool connected; + bool new_data; + + char *cookie_file; + char *remote_server; + char *remote_source_name; +}; + +static const char* const valid_modargs[] = { + "source_name", + "source_properties", + "server", + "source", + "format", + "channels", + "rate", + "channel_map", + "cookie", + /* "reconnect", reconnect if server comes back again - unimplemented */ + NULL, +}; + +static void cork_stream(struct userdata *u, bool cork) { + pa_operation *operation; + + pa_assert(u); + pa_assert(u->stream); + + if ((operation = pa_stream_cork(u->stream, cork, NULL, NULL))) + pa_operation_unref(operation); +} + +static void reset_bufferattr(pa_buffer_attr *bufferattr) { + pa_assert(bufferattr); + bufferattr->fragsize = (uint32_t) -1; + bufferattr->minreq = (uint32_t) -1; + bufferattr->maxlength = (uint32_t) -1; + bufferattr->prebuf = (uint32_t) -1; + bufferattr->tlength = (uint32_t) -1; +} + +static pa_proplist* tunnel_new_proplist(struct userdata *u) { + pa_proplist *proplist = pa_proplist_new(); + pa_assert(proplist); + pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, "PulseAudio"); + pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, "org.PulseAudio.PulseAudio"); + pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, PACKAGE_VERSION); + pa_init_proplist(proplist); + + return proplist; +} + +static void stream_read_cb(pa_stream *s, size_t length, void *userdata) { + struct userdata *u = userdata; + u->new_data = true; +} + +/* called from io context to read samples from the stream into our source */ +static void read_new_samples(struct userdata *u) { + const void *p; + size_t readable = 0; + pa_memchunk memchunk; + + pa_assert(u); + u->new_data = false; + + pa_memchunk_reset(&memchunk); + + if (PA_UNLIKELY(!u->connected || pa_stream_get_state(u->stream) != PA_STREAM_READY)) + return; + + readable = pa_stream_readable_size(u->stream); + while (readable > 0) { + size_t nbytes = 0; + if (PA_UNLIKELY(pa_stream_peek(u->stream, &p, &nbytes) != 0)) { + pa_log("pa_stream_peek() failed: %s", pa_strerror(pa_context_errno(u->context))); + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + return; + } + + if (PA_LIKELY(p)) { + /* we have valid data */ + memchunk.memblock = pa_memblock_new_fixed(u->module->core->mempool, (void *) p, nbytes, true); + memchunk.length = nbytes; + memchunk.index = 0; + + pa_source_post(u->source, &memchunk); + pa_memblock_unref_fixed(memchunk.memblock); + } else { + size_t bytes_to_generate = nbytes; + + /* we have a hole. generate silence */ + memchunk = u->source->silence; + pa_memblock_ref(memchunk.memblock); + + while (bytes_to_generate > 0) { + if (bytes_to_generate < memchunk.length) + memchunk.length = bytes_to_generate; + + pa_source_post(u->source, &memchunk); + bytes_to_generate -= memchunk.length; + } + + pa_memblock_unref(memchunk.memblock); + } + + pa_stream_drop(u->stream); + readable -= nbytes; + } +} + +static void thread_func(void *userdata) { + struct userdata *u = userdata; + pa_proplist *proplist; + + pa_assert(u); + + pa_log_debug("Thread starting up"); + pa_thread_mq_install(u->thread_mq); + + proplist = tunnel_new_proplist(u); + u->context = pa_context_new_with_proplist(u->thread_mainloop_api, + "PulseAudio", + proplist); + pa_proplist_free(proplist); + + if (!u->context) { + pa_log("Failed to create libpulse context"); + goto fail; + } + + if (u->cookie_file && pa_context_load_cookie_from_file(u->context, u->cookie_file) != 0) { + pa_log_error("Can not load cookie file!"); + goto fail; + } + + pa_context_set_state_callback(u->context, context_state_cb, u); + if (pa_context_connect(u->context, + u->remote_server, + PA_CONTEXT_NOAUTOSPAWN, + NULL) < 0) { + pa_log("Failed to connect libpulse context: %s", pa_strerror(pa_context_errno(u->context))); + goto fail; + } + + for (;;) { + int ret; + + if (pa_mainloop_iterate(u->thread_mainloop, 1, &ret) < 0) { + if (ret == 0) + goto finish; + else + goto fail; + } + + if (u->new_data) + read_new_samples(u); + } +fail: + pa_asyncmsgq_post(u->thread_mq->outq, PA_MSGOBJECT(u->module->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL); + pa_asyncmsgq_wait_for(u->thread_mq->inq, PA_MESSAGE_SHUTDOWN); + +finish: + if (u->stream) { + pa_stream_disconnect(u->stream); + pa_stream_unref(u->stream); + u->stream = NULL; + } + + if (u->context) { + pa_context_disconnect(u->context); + pa_context_unref(u->context); + u->context = NULL; + } + + pa_log_debug("Thread shutting down"); +} + +static void stream_state_cb(pa_stream *stream, void *userdata) { + struct userdata *u = userdata; + + pa_assert(u); + + switch (pa_stream_get_state(stream)) { + case PA_STREAM_FAILED: + pa_log_error("Stream failed: %s", pa_strerror(pa_context_errno(u->context))); + u->connected = false; + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + break; + case PA_STREAM_TERMINATED: + pa_log_debug("Stream terminated."); + break; + case PA_STREAM_READY: + if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) + cork_stream(u, false); + + /* Only call our requested_latency_cb when requested_latency + * changed between PA_STREAM_CREATING -> PA_STREAM_READY, because + * we don't want to override the initial fragsize set by the server + * without a good reason. */ + if (u->update_stream_bufferattr_after_connect) + source_update_requested_latency_cb(u->source); + case PA_STREAM_UNCONNECTED: + case PA_STREAM_CREATING: + break; + } +} + +static void context_state_cb(pa_context *c, void *userdata) { + struct userdata *u = userdata; + pa_assert(u); + + switch (pa_context_get_state(c)) { + case PA_CONTEXT_UNCONNECTED: + case PA_CONTEXT_CONNECTING: + case PA_CONTEXT_AUTHORIZING: + case PA_CONTEXT_SETTING_NAME: + break; + case PA_CONTEXT_READY: { + pa_proplist *proplist; + pa_buffer_attr bufferattr; + pa_usec_t requested_latency; + char *username = pa_get_user_name_malloc(); + char *hostname = pa_get_host_name_malloc(); + /* TODO: old tunnel put here the remote source_name into stream name e.g. 'Null Output for lynxis@lazus' */ + char *stream_name = pa_sprintf_malloc(_("Tunnel for %s@%s"), username, hostname); + pa_xfree(username); + pa_xfree(hostname); + + pa_log_debug("Connection successful. Creating stream."); + pa_assert(!u->stream); + + proplist = tunnel_new_proplist(u); + u->stream = pa_stream_new_with_proplist(u->context, + stream_name, + &u->source->sample_spec, + &u->source->channel_map, + proplist); + pa_proplist_free(proplist); + pa_xfree(stream_name); + + if (!u->stream) { + pa_log_error("Could not create a stream: %s", pa_strerror(pa_context_errno(u->context))); + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + return; + } + + requested_latency = pa_source_get_requested_latency_within_thread(u->source); + if (requested_latency == (uint32_t) -1) + requested_latency = u->source->thread_info.max_latency; + + reset_bufferattr(&bufferattr); + bufferattr.fragsize = pa_usec_to_bytes(requested_latency, &u->source->sample_spec); + + pa_stream_set_state_callback(u->stream, stream_state_cb, userdata); + pa_stream_set_read_callback(u->stream, stream_read_cb, userdata); + if (pa_stream_connect_record(u->stream, + u->remote_source_name, + &bufferattr, + PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_DONT_MOVE|PA_STREAM_AUTO_TIMING_UPDATE|PA_STREAM_START_CORKED) < 0) { + pa_log_debug("Could not create stream: %s", pa_strerror(pa_context_errno(u->context))); + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + } + u->connected = true; + break; + } + case PA_CONTEXT_FAILED: + pa_log_debug("Context failed with err %s.", pa_strerror(pa_context_errno(u->context))); + u->connected = false; + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + break; + case PA_CONTEXT_TERMINATED: + pa_log_debug("Context terminated."); + u->connected = false; + u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP); + break; + } +} + +static void source_update_requested_latency_cb(pa_source *s) { + struct userdata *u; + pa_operation *operation; + size_t nbytes; + pa_usec_t block_usec; + pa_buffer_attr bufferattr; + + pa_source_assert_ref(s); + pa_assert_se(u = s->userdata); + + block_usec = pa_source_get_requested_latency_within_thread(s); + if (block_usec == (pa_usec_t) -1) + block_usec = s->thread_info.max_latency; + + nbytes = pa_usec_to_bytes(block_usec, &s->sample_spec); + + if (u->stream) { + switch (pa_stream_get_state(u->stream)) { + case PA_STREAM_READY: + if (pa_stream_get_buffer_attr(u->stream)->fragsize == nbytes) + break; + + reset_bufferattr(&bufferattr); + bufferattr.fragsize = nbytes; + if ((operation = pa_stream_set_buffer_attr(u->stream, &bufferattr, NULL, NULL))) + pa_operation_unref(operation); + break; + case PA_STREAM_CREATING: + /* we have to delay our request until stream is ready */ + u->update_stream_bufferattr_after_connect = true; + break; + default: + break; + } + } +} + +static int source_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) { + struct userdata *u = PA_SOURCE(o)->userdata; + + switch (code) { + case PA_SOURCE_MESSAGE_GET_LATENCY: { + int negative; + pa_usec_t remote_latency; + + if (!PA_SOURCE_IS_LINKED(u->source->thread_info.state)) { + *((int64_t*) data) = 0; + return 0; + } + + if (!u->stream) { + *((int64_t*) data) = 0; + return 0; + } + + if (pa_stream_get_state(u->stream) != PA_STREAM_READY) { + *((int64_t*) data) = 0; + return 0; + } + + if (pa_stream_get_latency(u->stream, &remote_latency, &negative) < 0) { + *((int64_t*) data) = 0; + return 0; + } + + if (negative) + *((int64_t*) data) = - (int64_t)remote_latency; + else + *((int64_t*) data) = remote_latency; + + return 0; + } + } + return pa_source_process_msg(o, code, data, offset, chunk); +} + +/* Called from the IO thread. */ +static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) { + struct userdata *u; + + pa_assert(s); + pa_assert_se(u = s->userdata); + + /* It may be that only the suspend cause is changing, in which case there's + * nothing to do. */ + if (new_state == s->thread_info.state) + return 0; + + if (!u->stream || pa_stream_get_state(u->stream) != PA_STREAM_READY) + return 0; + + switch (new_state) { + case PA_SOURCE_SUSPENDED: { + cork_stream(u, true); + break; + } + case PA_SOURCE_IDLE: + case PA_SOURCE_RUNNING: { + cork_stream(u, false); + break; + } + case PA_SOURCE_INVALID_STATE: + case PA_SOURCE_INIT: + case PA_SOURCE_UNLINKED: + break; + } + + return 0; +} + +int pa__init(pa_module *m) { + struct userdata *u = NULL; + pa_modargs *ma = NULL; + pa_source_new_data source_data; + pa_sample_spec ss; + pa_channel_map map; + const char *remote_server = NULL; + const char *source_name = NULL; + char *default_source_name = NULL; + + pa_assert(m); + + if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { + pa_log("Failed to parse module arguments."); + goto fail; + } + + ss = m->core->default_sample_spec; + map = m->core->default_channel_map; + if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) { + pa_log("Invalid sample format specification or channel map"); + goto fail; + } + + remote_server = pa_modargs_get_value(ma, "server", NULL); + if (!remote_server) { + pa_log("No server given!"); + goto fail; + } + + u = pa_xnew0(struct userdata, 1); + u->module = m; + m->userdata = u; + u->remote_server = pa_xstrdup(remote_server); + u->thread_mainloop = pa_mainloop_new(); + if (u->thread_mainloop == NULL) { + pa_log("Failed to create mainloop"); + goto fail; + } + u->thread_mainloop_api = pa_mainloop_get_api(u->thread_mainloop); + u->cookie_file = pa_xstrdup(pa_modargs_get_value(ma, "cookie", NULL)); + u->remote_source_name = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL)); + + u->thread_mq = pa_xnew0(pa_thread_mq, 1); + + if (pa_thread_mq_init_thread_mainloop(u->thread_mq, m->core->mainloop, u->thread_mainloop_api) < 0) { + pa_log("pa_thread_mq_init_thread_mainloop() failed."); + goto fail; + } + + /* The rtpoll created here is never run. It is only necessary to avoid crashes + * when module-tunnel-source-new is used together with module-loopback. + * module-loopback bases the asyncmsq on the rtpoll provided by the source and + * only works because it calls pa_asyncmsq_process_one(). */ + u->rtpoll = pa_rtpoll_new(); + + /* Create source */ + pa_source_new_data_init(&source_data); + source_data.driver = __FILE__; + source_data.module = m; + + default_source_name = pa_sprintf_malloc("tunnel-source-new.%s", remote_server); + source_name = pa_modargs_get_value(ma, "source_name", default_source_name); + + pa_source_new_data_set_name(&source_data, source_name); + pa_source_new_data_set_sample_spec(&source_data, &ss); + pa_source_new_data_set_channel_map(&source_data, &map); + + pa_proplist_sets(source_data.proplist, PA_PROP_DEVICE_CLASS, "sound"); + pa_proplist_setf(source_data.proplist, + PA_PROP_DEVICE_DESCRIPTION, + _("Tunnel to %s/%s"), + remote_server, + pa_strempty(u->remote_source_name)); + + if (pa_modargs_get_proplist(ma, "source_properties", source_data.proplist, PA_UPDATE_REPLACE) < 0) { + pa_log("Invalid properties"); + pa_source_new_data_done(&source_data); + goto fail; + } + if (!(u->source = pa_source_new(m->core, &source_data, PA_SOURCE_LATENCY | PA_SOURCE_DYNAMIC_LATENCY | PA_SOURCE_NETWORK))) { + pa_log("Failed to create source."); + pa_source_new_data_done(&source_data); + goto fail; + } + + pa_source_new_data_done(&source_data); + u->source->userdata = u; + u->source->parent.process_msg = source_process_msg_cb; + u->source->set_state_in_io_thread = source_set_state_in_io_thread_cb; + u->source->update_requested_latency = source_update_requested_latency_cb; + + pa_source_set_asyncmsgq(u->source, u->thread_mq->inq); + pa_source_set_rtpoll(u->source, u->rtpoll); + + if (!(u->thread = pa_thread_new("tunnel-source", thread_func, u))) { + pa_log("Failed to create thread."); + goto fail; + } + + pa_source_put(u->source); + pa_modargs_free(ma); + pa_xfree(default_source_name); + + return 0; + +fail: + if (ma) + pa_modargs_free(ma); + + if (default_source_name) + pa_xfree(default_source_name); + + 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); + } + + if (u->thread_mq) { + pa_thread_mq_done(u->thread_mq); + pa_xfree(u->thread_mq); + } + + if (u->thread_mainloop) + pa_mainloop_free(u->thread_mainloop); + + if (u->cookie_file) + pa_xfree(u->cookie_file); + + if (u->remote_source_name) + pa_xfree(u->remote_source_name); + + if (u->remote_server) + pa_xfree(u->remote_server); + + if (u->source) + pa_source_unref(u->source); + + if (u->rtpoll) + pa_rtpoll_free(u->rtpoll); + + pa_xfree(u); +} |