diff options
Diffstat (limited to 'src/modules/module-pipe-source.c')
| -rw-r--r-- | src/modules/module-pipe-source.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/src/modules/module-pipe-source.c b/src/modules/module-pipe-source.c new file mode 100644 index 0000000..74ec055 --- /dev/null +++ b/src/modules/module-pipe-source.c @@ -0,0 +1,373 @@ +/*** + 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 <stdlib.h> +#include <sys/stat.h> +#include <stdio.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/ioctl.h> + +#ifdef HAVE_SYS_FILIO_H +#include <sys/filio.h> +#endif + +#include <pulse/xmalloc.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/poll.h> + +PA_MODULE_AUTHOR("Lennart Poettering"); +PA_MODULE_DESCRIPTION("UNIX pipe source"); +PA_MODULE_VERSION(PACKAGE_VERSION); +PA_MODULE_LOAD_ONCE(false); +PA_MODULE_USAGE( + "source_name=<name for the source> " + "source_properties=<properties for the source> " + "file=<path of the FIFO> " + "format=<sample format> " + "rate=<sample rate> " + "channels=<number of channels> " + "channel_map=<channel map>"); + +#define DEFAULT_FILE_NAME "/tmp/music.input" +#define DEFAULT_SOURCE_NAME "fifo_input" + +struct userdata { + pa_core *core; + pa_module *module; + pa_source *source; + + pa_thread *thread; + pa_thread_mq thread_mq; + pa_rtpoll *rtpoll; + + char *filename; + int fd; + + pa_memchunk memchunk; + + pa_rtpoll_item *rtpoll_item; +}; + +static const char* const valid_modargs[] = { + "source_name", + "source_properties", + "file", + "format", + "rate", + "channels", + "channel_map", + 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_SOURCE_MESSAGE_GET_LATENCY: { + size_t n = 0; + +#ifdef FIONREAD + int l; + + if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0) + n = (size_t) l; +#endif + + *((int64_t*) data) = pa_bytes_to_usec(n, &u->source->sample_spec); + return 0; + } + } + + return pa_source_process_msg(o, code, data, offset, chunk); +} + +static void thread_func(void *userdata) { + struct userdata *u = userdata; + int read_type = 0; + + pa_assert(u); + + pa_log_debug("Thread starting up"); + + pa_thread_mq_install(&u->thread_mq); + + for (;;) { + int ret; + struct pollfd *pollfd; + + pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL); + + /* Try to read some data and pass it on to the source driver */ + if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) { + ssize_t l; + void *p; + + if (!u->memchunk.memblock) { + u->memchunk.memblock = pa_memblock_new(u->core->mempool, pa_pipe_buf(u->fd)); + u->memchunk.index = u->memchunk.length = 0; + } + + pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index); + + p = pa_memblock_acquire(u->memchunk.memblock); + l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type); + pa_memblock_release(u->memchunk.memblock); + + pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */ + + if (l < 0) { + + if (errno == EINTR) + continue; + else if (errno != EAGAIN) { + pa_log("Failed to read data from FIFO: %s", pa_cstrerror(errno)); + goto fail; + } + + } else { + + u->memchunk.length = (size_t) l; + pa_source_post(u->source, &u->memchunk); + u->memchunk.index += (size_t) l; + + if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) { + pa_memblock_unref(u->memchunk.memblock); + pa_memchunk_reset(&u->memchunk); + } + + pollfd->revents = 0; + } + } + + /* Hmm, nothing to do. Let's sleep */ + pollfd->events = (short) (u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0); + + if ((ret = pa_rtpoll_run(u->rtpoll)) < 0) + goto fail; + + if (ret == 0) + goto finish; + + pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL); + + if (pollfd->revents & ~POLLIN) { + pa_log("FIFO shutdown."); + goto fail; + } + } + +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"); +} + +int pa__init(pa_module *m) { + struct userdata *u; + struct stat st; + pa_sample_spec ss; + pa_channel_map map; + pa_modargs *ma; + struct pollfd *pollfd; + pa_source_new_data data; + + 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; + } + + m->userdata = u = pa_xnew0(struct userdata, 1); + u->core = m->core; + u->module = m; + pa_memchunk_reset(&u->memchunk); + u->rtpoll = pa_rtpoll_new(); + + if (pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll) < 0) { + pa_log("pa_thread_mq_init() failed."); + goto fail; + } + + u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME)); + + if (mkfifo(u->filename, 0666) < 0) { + pa_log("mkfifo('%s'): %s", u->filename, pa_cstrerror(errno)); + goto fail; + } else { + /* Our umask is 077, so the pipe won't be created with the requested + * permissions. Let's fix the permissions with chmod(). */ + if (chmod(u->filename, 0666) < 0) + pa_log_warn("chomd('%s'): %s", u->filename, pa_cstrerror(errno)); + } + + if ((u->fd = pa_open_cloexec(u->filename, O_RDWR, 0)) < 0) { + pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno)); + goto fail; + } + + pa_make_fd_nonblock(u->fd); + + if (fstat(u->fd, &st) < 0) { + pa_log("fstat('%s'): %s", u->filename, pa_cstrerror(errno)); + goto fail; + } + + if (!S_ISFIFO(st.st_mode)) { + pa_log("'%s' is not a FIFO.", u->filename); + goto fail; + } + + 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_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename); + pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO source %s", u->filename); + pa_source_new_data_set_sample_spec(&data, &ss); + pa_source_new_data_set_channel_map(&data, &map); + + if (pa_modargs_get_proplist(ma, "source_properties", data.proplist, PA_UPDATE_REPLACE) < 0) { + pa_log("Invalid properties"); + pa_source_new_data_done(&data); + goto fail; + } + + 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->userdata = u; + + pa_source_set_asyncmsgq(u->source, u->thread_mq.inq); + pa_source_set_rtpoll(u->source, u->rtpoll); + pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(pa_pipe_buf(u->fd), &u->source->sample_spec)); + + u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1); + pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL); + pollfd->fd = u->fd; + pollfd->events = pollfd->revents = 0; + + if (!(u->thread = pa_thread_new("pipe-source", 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; +} + +int pa__get_n_used(pa_module *m) { + struct userdata *u; + + pa_assert(m); + pa_assert_se(u = m->userdata); + + return pa_source_linked_by(u->source); +} + +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_item) + pa_rtpoll_item_free(u->rtpoll_item); + + if (u->rtpoll) + pa_rtpoll_free(u->rtpoll); + + if (u->filename) { + unlink(u->filename); + pa_xfree(u->filename); + } + + if (u->fd >= 0) + pa_assert_se(pa_close(u->fd) == 0); + + pa_xfree(u); +} |