/*** This file is part of PulseAudio. 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 #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "module-rtp-recv-symdef.h" #include "rtp.h" #include "sdp.h" #include "sap.h" PA_MODULE_AUTHOR("Lennart Poettering") PA_MODULE_DESCRIPTION("Recieve data from a network via RTP/SAP/SDP") PA_MODULE_VERSION(PACKAGE_VERSION) PA_MODULE_USAGE( "sink= " "sap_address= " ) #define SAP_PORT 9875 #define DEFAULT_SAP_ADDRESS "224.0.0.56" #define MEMBLOCKQ_MAXLENGTH (1024*170) #define MAX_SESSIONS 16 #define DEATH_TIMEOUT 20000000 static const char* const valid_modargs[] = { "sink", "sap_address", NULL }; struct session { struct userdata *userdata; pa_sink_input *sink_input; pa_memblockq *memblockq; pa_time_event *death_event; int first_packet; uint32_t ssrc; uint32_t offset; struct pa_sdp_info sdp_info; pa_rtp_context rtp_context; pa_io_event* rtp_event; }; struct userdata { pa_module *module; pa_core *core; pa_sap_context sap_context; pa_io_event* sap_event; pa_hashmap *by_origin; char *sink_name; int n_sessions; }; static void session_free(struct session *s, int from_hash); static int sink_input_peek(pa_sink_input *i, pa_memchunk *chunk) { struct session *s; assert(i); s = i->userdata; return pa_memblockq_peek(s->memblockq, chunk); } static void sink_input_drop(pa_sink_input *i, const pa_memchunk *chunk, size_t length) { struct session *s; assert(i); s = i->userdata; pa_memblockq_drop(s->memblockq, chunk, length); } static void sink_input_kill(pa_sink_input* i) { struct session *s; assert(i); s = i->userdata; session_free(s, 1); } static pa_usec_t sink_input_get_latency(pa_sink_input *i) { struct session *s; assert(i); s = i->userdata; return pa_bytes_to_usec(pa_memblockq_get_length(s->memblockq), &i->sample_spec); } static void rtp_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) { struct session *s = userdata; pa_memchunk chunk; int64_t k, j, delta; struct timeval tv; assert(m); assert(e); assert(s); assert(fd == s->rtp_context.fd); assert(flags == PA_IO_EVENT_INPUT); if (pa_rtp_recv(&s->rtp_context, &chunk, s->userdata->core->mempool) < 0) return; if (s->sdp_info.payload != s->rtp_context.payload) { pa_memblock_unref(chunk.memblock); return; } if (!s->first_packet) { s->first_packet = 1; s->ssrc = s->rtp_context.ssrc; s->offset = s->rtp_context.timestamp; if (s->ssrc == s->userdata->core->cookie) pa_log_warn("WARNING! Detected RTP packet loop!"); } else { if (s->ssrc != s->rtp_context.ssrc) { pa_memblock_unref(chunk.memblock); return; } } /* Check wheter there was a timestamp overflow */ k = (int64_t) s->rtp_context.timestamp - (int64_t) s->offset; j = (int64_t) 0x100000000LL - (int64_t) s->offset + (int64_t) s->rtp_context.timestamp; if ((k < 0 ? -k : k) < (j < 0 ? -j : j)) delta = k; else delta = j; pa_memblockq_seek(s->memblockq, delta * s->rtp_context.frame_size, PA_SEEK_RELATIVE); if (pa_memblockq_push(s->memblockq, &chunk) < 0) { /* queue overflow, let's flush it and try again */ pa_memblockq_flush(s->memblockq); pa_memblockq_push(s->memblockq, &chunk); } /* The next timestamp we expect */ s->offset = s->rtp_context.timestamp + (chunk.length / s->rtp_context.frame_size); pa_memblock_unref(chunk.memblock); /* Reset death timer */ pa_gettimeofday(&tv); pa_timeval_add(&tv, DEATH_TIMEOUT); m->time_restart(s->death_event, &tv); } static void death_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) { struct session *s = userdata; assert(m); assert(t); assert(tv); assert(s); session_free(s, 1); } static int mcast_socket(const struct sockaddr* sa, socklen_t salen) { int af, fd = -1, r, one; af = sa->sa_family; if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) { pa_log("Failed to create socket: %s", pa_cstrerror(errno)); goto fail; } one = 1; if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) { pa_log("SO_REUSEADDR failed: %s", pa_cstrerror(errno)); goto fail; } if (af == AF_INET) { struct ip_mreq mr4; memset(&mr4, 0, sizeof(mr4)); mr4.imr_multiaddr = ((const struct sockaddr_in*) sa)->sin_addr; r = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr4, sizeof(mr4)); } else { struct ipv6_mreq mr6; memset(&mr6, 0, sizeof(mr6)); mr6.ipv6mr_multiaddr = ((const struct sockaddr_in6*) sa)->sin6_addr; r = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mr6, sizeof(mr6)); } if (r < 0) { pa_log_info("Joining mcast group failed: %s", pa_cstrerror(errno)); goto fail; } if (bind(fd, sa, salen) < 0) { pa_log("bind() failed: %s", pa_cstrerror(errno)); goto fail; } return fd; fail: if (fd >= 0) close(fd); return -1; } static struct session *session_new(struct userdata *u, const pa_sdp_info *sdp_info) { struct session *s = NULL; struct timeval tv; char *c; pa_sink *sink; int fd = -1; pa_memblock *silence; pa_sink_input_new_data data; if (u->n_sessions >= MAX_SESSIONS) { pa_log("session limit reached."); goto fail; } if (!(sink = pa_namereg_get(u->core, u->sink_name, PA_NAMEREG_SINK, 1))) { pa_log("sink does not exist."); goto fail; } s = pa_xnew0(struct session, 1); s->userdata = u; s->first_packet = 0; s->sdp_info = *sdp_info; if ((fd = mcast_socket((const struct sockaddr*) &sdp_info->sa, sdp_info->salen)) < 0) goto fail; c = pa_sprintf_malloc("RTP Stream%s%s%s", sdp_info->session_name ? " (" : "", sdp_info->session_name ? sdp_info->session_name : "", sdp_info->session_name ? ")" : ""); pa_sink_input_new_data_init(&data); data.sink = sink; data.driver = __FILE__; data.name = c; data.module = u->module; pa_sink_input_new_data_set_sample_spec(&data, &sdp_info->sample_spec); s->sink_input = pa_sink_input_new(u->core, &data, 0); pa_xfree(c); if (!s->sink_input) { pa_log("failed to create sink input."); goto fail; } s->sink_input->userdata = s; s->sink_input->peek = sink_input_peek; s->sink_input->drop = sink_input_drop; s->sink_input->kill = sink_input_kill; s->sink_input->get_latency = sink_input_get_latency; silence = pa_silence_memblock_new(s->userdata->core->mempool, &s->sink_input->sample_spec, (pa_bytes_per_second(&s->sink_input->sample_spec)/128/pa_frame_size(&s->sink_input->sample_spec))* pa_frame_size(&s->sink_input->sample_spec)); s->memblockq = pa_memblockq_new( 0, MEMBLOCKQ_MAXLENGTH, MEMBLOCKQ_MAXLENGTH, pa_frame_size(&s->sink_input->sample_spec), pa_bytes_per_second(&s->sink_input->sample_spec)/10+1, 0, silence); pa_memblock_unref(silence); s->rtp_event = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, rtp_event_cb, s); pa_gettimeofday(&tv); pa_timeval_add(&tv, DEATH_TIMEOUT); s->death_event = u->core->mainloop->time_new(u->core->mainloop, &tv, death_event_cb, s); pa_hashmap_put(s->userdata->by_origin, s->sdp_info.origin, s); pa_rtp_context_init_recv(&s->rtp_context, fd, pa_frame_size(&s->sdp_info.sample_spec)); pa_log_info("Found new session '%s'", s->sdp_info.session_name); u->n_sessions++; return s; fail: if (s) { if (fd >= 0) close(fd); pa_xfree(s); } return NULL; } static void session_free(struct session *s, int from_hash) { assert(s); pa_log_info("Freeing session '%s'", s->sdp_info.session_name); s->userdata->core->mainloop->time_free(s->death_event); s->userdata->core->mainloop->io_free(s->rtp_event); if (from_hash) pa_hashmap_remove(s->userdata->by_origin, s->sdp_info.origin); pa_sink_input_disconnect(s->sink_input); pa_sink_input_unref(s->sink_input); pa_memblockq_free(s->memblockq); pa_sdp_info_destroy(&s->sdp_info); pa_rtp_context_destroy(&s->rtp_context); assert(s->userdata->n_sessions >= 1); s->userdata->n_sessions--; pa_xfree(s); } static void sap_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) { struct userdata *u = userdata; int goodbye; pa_sdp_info info; struct session *s; assert(m); assert(e); assert(u); assert(fd == u->sap_context.fd); assert(flags == PA_IO_EVENT_INPUT); if (pa_sap_recv(&u->sap_context, &goodbye) < 0) return; if (!pa_sdp_parse(u->sap_context.sdp_data, &info, goodbye)) return; if (goodbye) { if ((s = pa_hashmap_get(u->by_origin, info.origin))) session_free(s, 1); pa_sdp_info_destroy(&info); } else { if (!(s = pa_hashmap_get(u->by_origin, info.origin))) { if (!(s = session_new(u, &info))) pa_sdp_info_destroy(&info); } else { struct timeval tv; pa_gettimeofday(&tv); pa_timeval_add(&tv, DEATH_TIMEOUT); m->time_restart(s->death_event, &tv); pa_sdp_info_destroy(&info); } } } int pa__init(pa_core *c, pa_module*m) { struct userdata *u; pa_modargs *ma = NULL; struct sockaddr_in sa4; struct sockaddr_in6 sa6; struct sockaddr *sa; socklen_t salen; const char *sap_address; int fd = -1; assert(c); assert(m); if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { pa_log("failed to parse module arguments"); goto fail; } sap_address = pa_modargs_get_value(ma, "sap_address", DEFAULT_SAP_ADDRESS); if (inet_pton(AF_INET6, sap_address, &sa6.sin6_addr) > 0) { sa6.sin6_family = AF_INET6; sa6.sin6_port = htons(SAP_PORT); sa = (struct sockaddr*) &sa6; salen = sizeof(sa6); } else if (inet_pton(AF_INET, sap_address, &sa4.sin_addr) > 0) { sa4.sin_family = AF_INET; sa4.sin_port = htons(SAP_PORT); sa = (struct sockaddr*) &sa4; salen = sizeof(sa4); } else { pa_log("invalid SAP address '%s'", sap_address); goto fail; } if ((fd = mcast_socket(sa, salen)) < 0) goto fail; u = pa_xnew(struct userdata, 1); m->userdata = u; u->module = m; u->core = c; u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL)); u->n_sessions = 0; u->sap_event = c->mainloop->io_new(c->mainloop, fd, PA_IO_EVENT_INPUT, sap_event_cb, u); u->by_origin = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func); pa_sap_context_init_recv(&u->sap_context, fd); pa_modargs_free(ma); return 0; fail: if (ma) pa_modargs_free(ma); if (fd >= 0) close(fd); return -1; } static void free_func(void *p, PA_GCC_UNUSED void *userdata) { session_free(p, 0); } void pa__done(pa_core *c, pa_module*m) { struct userdata *u; assert(c); assert(m); if (!(u = m->userdata)) return; c->mainloop->io_free(u->sap_event); pa_sap_context_destroy(&u->sap_context); pa_hashmap_free(u->by_origin, free_func, NULL); pa_xfree(u->sink_name); pa_xfree(u); }