diff options
Diffstat (limited to 'src/modules/rtp/module-rtp-recv.c')
| -rw-r--r-- | src/modules/rtp/module-rtp-recv.c | 774 |
1 files changed, 774 insertions, 0 deletions
diff --git a/src/modules/rtp/module-rtp-recv.c b/src/modules/rtp/module-rtp-recv.c new file mode 100644 index 0000000..a9b42bb --- /dev/null +++ b/src/modules/rtp/module-rtp-recv.c @@ -0,0 +1,774 @@ + +/*** + This file is part of PulseAudio. + + Copyright 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 <sys/socket.h> +#include <netinet/in.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> +#include <math.h> + +#include <pulse/rtclock.h> +#include <pulse/timeval.h> +#include <pulse/xmalloc.h> + +#include <pulsecore/core-error.h> +#include <pulsecore/module.h> +#include <pulsecore/llist.h> +#include <pulsecore/sink.h> +#include <pulsecore/sink-input.h> +#include <pulsecore/memblockq.h> +#include <pulsecore/log.h> +#include <pulsecore/core-rtclock.h> +#include <pulsecore/core-util.h> +#include <pulsecore/modargs.h> +#include <pulsecore/namereg.h> +#include <pulsecore/sample-util.h> +#include <pulsecore/macro.h> +#include <pulsecore/socket-util.h> +#include <pulsecore/atomic.h> +#include <pulsecore/once.h> +#include <pulsecore/poll.h> +#include <pulsecore/arpa-inet.h> + +#include "rtp.h" +#include "sdp.h" +#include "sap.h" + +PA_MODULE_AUTHOR("Lennart Poettering"); +PA_MODULE_DESCRIPTION("Receive data from a network via RTP/SAP/SDP"); +PA_MODULE_VERSION(PACKAGE_VERSION); +PA_MODULE_LOAD_ONCE(false); +PA_MODULE_USAGE( + "sink=<name of the sink> " + "sap_address=<multicast address to listen on> " + "latency_msec=<latency in ms> " +); + +#define SAP_PORT 9875 +#define DEFAULT_SAP_ADDRESS "224.0.0.56" +#define DEFAULT_LATENCY_MSEC 500 +#define MEMBLOCKQ_MAXLENGTH (1024*1024*40) +#define MAX_SESSIONS 16 +#define DEATH_TIMEOUT 20 +#define RATE_UPDATE_INTERVAL (5*PA_USEC_PER_SEC) + +static const char* const valid_modargs[] = { + "sink", + "sap_address", + "latency_msec", + NULL +}; + +struct session { + struct userdata *userdata; + PA_LLIST_FIELDS(struct session); + + pa_sink_input *sink_input; + pa_memblockq *memblockq; + + bool first_packet; + uint32_t offset; + + struct pa_sdp_info sdp_info; + + pa_rtp_context *rtp_context; + + pa_rtpoll_item *rtpoll_item; + + pa_atomic_t timestamp; + + pa_usec_t intended_latency; + pa_usec_t sink_latency; + + unsigned int base_rate; + pa_usec_t last_rate_update; + pa_usec_t last_latency; + double estimated_rate; + double avg_estimated_rate; +}; + +struct userdata { + pa_module *module; + pa_core *core; + + pa_sap_context sap_context; + pa_io_event* sap_event; + + pa_time_event *check_death_event; + + char *sink_name; + + PA_LLIST_HEAD(struct session, sessions); + pa_hashmap *by_origin; + int n_sessions; + + pa_usec_t latency; +}; + +static void session_free(struct session *s); + +/* Called from I/O thread context */ +static int sink_input_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) { + struct session *s = PA_SINK_INPUT(o)->userdata; + + switch (code) { + case PA_SINK_INPUT_MESSAGE_GET_LATENCY: + *((pa_usec_t*) data) = pa_bytes_to_usec(pa_memblockq_get_length(s->memblockq), &s->sink_input->sample_spec); + + /* Fall through, the default handler will add in the extra + * latency added by the resampler */ + break; + } + + return pa_sink_input_process_msg(o, code, data, offset, chunk); +} + +/* Called from I/O thread context */ +static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) { + struct session *s; + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + if (pa_memblockq_peek(s->memblockq, chunk) < 0) + return -1; + + pa_memblockq_drop(s->memblockq, chunk->length); + + return 0; +} + +/* Called from I/O thread context */ +static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) { + struct session *s; + + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + pa_memblockq_rewind(s->memblockq, nbytes); +} + +/* Called from I/O thread context */ +static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) { + struct session *s; + + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + pa_memblockq_set_maxrewind(s->memblockq, nbytes); +} + +/* Called from main context */ +static void sink_input_kill(pa_sink_input* i) { + struct session *s; + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + pa_hashmap_remove_and_free(s->userdata->by_origin, s->sdp_info.origin); +} + +/* Called from IO context */ +static void sink_input_suspend_within_thread(pa_sink_input* i, bool b) { + struct session *s; + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + if (b) + pa_memblockq_flush_read(s->memblockq); + else + s->first_packet = false; +} + +/* Called from I/O thread context */ +static int rtpoll_work_cb(pa_rtpoll_item *i) { + pa_memchunk chunk; + uint32_t timestamp; + int64_t k, j, delta; + struct timeval now = { 0, 0 }; + struct session *s; + struct pollfd *p; + + pa_assert_se(s = pa_rtpoll_item_get_work_userdata(i)); + + p = pa_rtpoll_item_get_pollfd(i, NULL); + + if (p->revents & (POLLERR|POLLNVAL|POLLHUP|POLLOUT)) { + pa_log("poll() signalled bad revents."); + return -1; + } + + if ((p->revents & POLLIN) == 0) + return 0; + + p->revents = 0; + + if (pa_rtp_recv(s->rtp_context, &chunk, s->userdata->module->core->mempool, ×tamp, &now) < 0) + return 0; + + if (!PA_SINK_IS_OPENED(s->sink_input->sink->thread_info.state)) { + pa_memblock_unref(chunk.memblock); + return 0; + } + + if (!s->first_packet) { + s->first_packet = true; + s->offset = timestamp; + } + + /* Check whether there was a timestamp overflow */ + k = (int64_t) timestamp - (int64_t) s->offset; + j = (int64_t) 0x100000000LL - (int64_t) s->offset + (int64_t) timestamp; + + if ((k < 0 ? -k : k) < (j < 0 ? -j : j)) + delta = k; + else + delta = j; + + pa_memblockq_seek(s->memblockq, delta * (int64_t) pa_rtp_context_get_frame_size(s->rtp_context), PA_SEEK_RELATIVE, + true); + + if (now.tv_sec == 0) { + PA_ONCE_BEGIN { + pa_log_warn("Using artificial time instead of timestamp"); + } PA_ONCE_END; + pa_rtclock_get(&now); + } else + pa_rtclock_from_wallclock(&now); + + if (pa_memblockq_push(s->memblockq, &chunk) < 0) { + pa_log_warn("Queue overrun"); + pa_memblockq_seek(s->memblockq, (int64_t) chunk.length, PA_SEEK_RELATIVE, true); + } + +/* pa_log("blocks in q: %u", pa_memblockq_get_nblocks(s->memblockq)); */ + + pa_memblock_unref(chunk.memblock); + + /* The next timestamp we expect */ + s->offset = timestamp + (uint32_t) (chunk.length / pa_rtp_context_get_frame_size(s->rtp_context)); + + pa_atomic_store(&s->timestamp, (int) now.tv_sec); + + if (s->last_rate_update + RATE_UPDATE_INTERVAL < pa_timeval_load(&now)) { + pa_usec_t wi, ri, render_delay, sink_delay = 0, latency; + uint32_t current_rate = s->sink_input->sample_spec.rate; + uint32_t new_rate; + double estimated_rate, alpha = 0.02; + + pa_log_debug("Updating sample rate"); + + wi = pa_bytes_to_usec((uint64_t) pa_memblockq_get_write_index(s->memblockq), &s->sink_input->sample_spec); + ri = pa_bytes_to_usec((uint64_t) pa_memblockq_get_read_index(s->memblockq), &s->sink_input->sample_spec); + + pa_log_debug("wi=%lu ri=%lu", (unsigned long) wi, (unsigned long) ri); + + sink_delay = pa_sink_get_latency_within_thread(s->sink_input->sink, false); + render_delay = pa_bytes_to_usec(pa_memblockq_get_length(s->sink_input->thread_info.render_memblockq), &s->sink_input->sink->sample_spec); + + if (ri > render_delay+sink_delay) + ri -= render_delay+sink_delay; + else + ri = 0; + + if (wi < ri) + latency = 0; + else + latency = wi - ri; + + pa_log_debug("Write index deviates by %0.2f ms, expected %0.2f ms", (double) latency/PA_USEC_PER_MSEC, (double) s->intended_latency/PA_USEC_PER_MSEC); + + /* The buffer is filling with some unknown rate R̂ samples/second. If the rate of reading in + * the last T seconds was Rⁿ, then the increase in buffer latency ΔLⁿ = Lⁿ - Lⁿ⁻ⁱ in that + * same period is ΔLⁿ = (TR̂ - TRⁿ) / R̂, giving the estimated target rate + * T + * R̂ = ─────────────── Rⁿ . (1) + * T - (Lⁿ - Lⁿ⁻ⁱ) + * + * Setting the sample rate to R̂ results in the latency being constant (if the estimate of R̂ + * is correct). But there is also the requirement to keep the buffer at a predefined target + * latency L̂. So instead of setting Rⁿ⁺ⁱ to R̂ immediately, the strategy will be to reduce R + * from Rⁿ⁺ⁱ to R̂ in a steps of T seconds, where Rⁿ⁺ⁱ is chosen such that in the total time + * aT the latency is reduced from Lⁿ to L̂. This strategy translates to the requirements + * ₐ R̂ - Rⁿ⁺ʲ a-j+1 j-1 + * Σ T ────────── = L̂ - Lⁿ with Rⁿ⁺ʲ = ───── Rⁿ⁺ⁱ + ───── R̂ . + * ʲ⁼ⁱ R̂ a a + * Solving for Rⁿ⁺ⁱ gives + * T - ²∕ₐ₊₁(L̂ - Lⁿ) + * Rⁿ⁺ⁱ = ───────────────── R̂ . (2) + * T + * In the code below a = 7 is used. + * + * Equation (1) is not directly used in (2), but instead an exponentially weighted average + * of the estimated rate R̂ is used. This average R̅ is defined as + * R̅ⁿ = α R̂ⁿ + (1-α) R̅ⁿ⁻ⁱ . + * Because it is difficult to find a fixed value for the coefficient α such that the + * averaging is without significant lag but oscillations are filtered out, a heuristic is + * used. When the successive estimates R̂ⁿ do not change much then α→1, but when there is a + * sudden spike in the estimated rate α→0, such that the deviation is given little weight. + */ + estimated_rate = (double) current_rate * (double) RATE_UPDATE_INTERVAL / (double) (RATE_UPDATE_INTERVAL + s->last_latency - latency); + if (fabs(s->estimated_rate - s->avg_estimated_rate) > 1) { + double ratio = (estimated_rate + s->estimated_rate - 2*s->avg_estimated_rate) / (s->estimated_rate - s->avg_estimated_rate); + alpha = PA_CLAMP(2 * (ratio + fabs(ratio)) / (4 + ratio*ratio), 0.02, 0.8); + } + s->avg_estimated_rate = alpha * estimated_rate + (1-alpha) * s->avg_estimated_rate; + s->estimated_rate = estimated_rate; + pa_log_debug("Estimated target rate: %.0f Hz, using average of %.0f Hz (α=%.3f)", estimated_rate, s->avg_estimated_rate, alpha); + new_rate = (uint32_t) ((double) (RATE_UPDATE_INTERVAL + latency/4 - s->intended_latency/4) / (double) RATE_UPDATE_INTERVAL * s->avg_estimated_rate); + s->last_latency = latency; + + if (new_rate < (uint32_t) (s->base_rate*0.8) || new_rate > (uint32_t) (s->base_rate*1.25)) { + pa_log_warn("Sample rates too different, not adjusting (%u vs. %u).", s->base_rate, new_rate); + new_rate = s->base_rate; + } else { + if (s->base_rate < new_rate + 20 && new_rate < s->base_rate + 20) + new_rate = s->base_rate; + /* Do the adjustment in small steps; 2‰ can be considered inaudible */ + if (new_rate < (uint32_t) (current_rate*0.998) || new_rate > (uint32_t) (current_rate*1.002)) { + pa_log_info("New rate of %u Hz not within 2‰ of %u Hz, forcing smaller adjustment", new_rate, current_rate); + new_rate = PA_CLAMP(new_rate, (uint32_t) (current_rate*0.998), (uint32_t) (current_rate*1.002)); + } + } + s->sink_input->sample_spec.rate = new_rate; + + pa_assert(pa_sample_spec_valid(&s->sink_input->sample_spec)); + + pa_resampler_set_input_rate(s->sink_input->thread_info.resampler, s->sink_input->sample_spec.rate); + + pa_log_debug("Updated sampling rate to %lu Hz.", (unsigned long) s->sink_input->sample_spec.rate); + + s->last_rate_update = pa_timeval_load(&now); + } + + if (pa_memblockq_is_readable(s->memblockq) && + s->sink_input->thread_info.underrun_for > 0) { + pa_log_debug("Requesting rewind due to end of underrun"); + pa_sink_input_request_rewind(s->sink_input, + (size_t) (s->sink_input->thread_info.underrun_for == (uint64_t) -1 ? 0 : s->sink_input->thread_info.underrun_for), + false, true, false); + } + + return 1; +} + +/* Called from I/O thread context */ +static void sink_input_attach(pa_sink_input *i) { + struct session *s; + + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + pa_assert(!s->rtpoll_item); + s->rtpoll_item = pa_rtp_context_get_rtpoll_item(s->rtp_context, i->sink->thread_info.rtpoll); + + pa_rtpoll_item_set_work_callback(s->rtpoll_item, rtpoll_work_cb, s); +} + +/* Called from I/O thread context */ +static void sink_input_detach(pa_sink_input *i) { + struct session *s; + pa_sink_input_assert_ref(i); + pa_assert_se(s = i->userdata); + + pa_assert(s->rtpoll_item); + pa_rtpoll_item_free(s->rtpoll_item); + s->rtpoll_item = NULL; +} + +static int mcast_socket(const struct sockaddr* sa, socklen_t salen) { + int af, fd = -1, r, one; + + pa_assert(sa); + pa_assert(salen > 0); + + af = sa->sa_family; + if ((fd = pa_socket_cloexec(af, SOCK_DGRAM, 0)) < 0) { + pa_log("Failed to create socket: %s", pa_cstrerror(errno)); + goto fail; + } + + pa_make_udp_socket_low_delay(fd); + +#ifdef SO_TIMESTAMP + one = 1; + if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)) < 0) { + pa_log("SO_TIMESTAMP failed: %s", pa_cstrerror(errno)); + goto fail; + } +#else + pa_log("SO_TIMESTAMP unsupported on this platform"); + goto fail; +#endif + + one = 1; + if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) { + pa_log("SO_REUSEADDR failed: %s", pa_cstrerror(errno)); + goto fail; + } + + r = 0; + if (af == AF_INET) { + /* IPv4 multicast addresses are in the 224.0.0.0-239.255.255.255 range */ + static const uint32_t ipv4_mcast_mask = 0xe0000000; + + if ((ntohl(((const struct sockaddr_in*) sa)->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask) { + 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)); + } +#ifdef HAVE_IPV6 + } else if (af == AF_INET6) { + /* IPv6 multicast addresses have 255 as the most significant byte */ + if (((const struct sockaddr_in6*) sa)->sin6_addr.s6_addr[0] == 0xff) { + 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)); + } +#endif + } else + pa_assert_not_reached(); + + 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; + pa_sink *sink; + int fd = -1; + pa_memchunk silence; + pa_sink_input_new_data data; + struct timeval now; + + pa_assert(u); + pa_assert(sdp_info); + + if (u->n_sessions >= MAX_SESSIONS) { + pa_log("Session limit reached."); + goto fail; + } + + if (!(sink = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK))) { + pa_log("Sink does not exist."); + goto fail; + } + + pa_rtclock_get(&now); + + s = pa_xnew0(struct session, 1); + s->userdata = u; + s->first_packet = false; + s->sdp_info = *sdp_info; + s->rtpoll_item = NULL; + s->intended_latency = u->latency; + s->last_rate_update = pa_timeval_load(&now); + s->last_latency = u->latency; + pa_atomic_store(&s->timestamp, (int) now.tv_sec); + + if ((fd = mcast_socket((const struct sockaddr*) &sdp_info->sa, sdp_info->salen)) < 0) + goto fail; + + pa_sink_input_new_data_init(&data); + pa_sink_input_new_data_set_sink(&data, sink, false, true); + data.driver = __FILE__; + pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "stream"); + pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, + "RTP Stream%s%s%s", + sdp_info->session_name ? " (" : "", + sdp_info->session_name ? sdp_info->session_name : "", + sdp_info->session_name ? ")" : ""); + + if (sdp_info->session_name) + pa_proplist_sets(data.proplist, "rtp.session", sdp_info->session_name); + pa_proplist_sets(data.proplist, "rtp.origin", sdp_info->origin); + pa_proplist_setf(data.proplist, "rtp.payload", "%u", (unsigned) sdp_info->payload); + data.module = u->module; + pa_sink_input_new_data_set_sample_spec(&data, &sdp_info->sample_spec); + data.flags = PA_SINK_INPUT_VARIABLE_RATE; + + pa_sink_input_new(&s->sink_input, u->module->core, &data); + pa_sink_input_new_data_done(&data); + + if (!s->sink_input) { + pa_log("Failed to create sink input."); + goto fail; + } + + s->base_rate = (double) s->sink_input->sample_spec.rate; + s->estimated_rate = (double) s->sink_input->sample_spec.rate; + s->avg_estimated_rate = (double) s->sink_input->sample_spec.rate; + + s->sink_input->userdata = s; + + s->sink_input->parent.process_msg = sink_input_process_msg; + s->sink_input->pop = sink_input_pop_cb; + s->sink_input->process_rewind = sink_input_process_rewind_cb; + s->sink_input->update_max_rewind = sink_input_update_max_rewind_cb; + s->sink_input->kill = sink_input_kill; + s->sink_input->attach = sink_input_attach; + s->sink_input->detach = sink_input_detach; + s->sink_input->suspend_within_thread = sink_input_suspend_within_thread; + + pa_sink_input_get_silence(s->sink_input, &silence); + + s->sink_latency = pa_sink_input_set_requested_latency(s->sink_input, s->intended_latency/2); + + if (s->intended_latency < s->sink_latency*2) + s->intended_latency = s->sink_latency*2; + + s->memblockq = pa_memblockq_new( + "module-rtp-recv memblockq", + 0, + MEMBLOCKQ_MAXLENGTH, + MEMBLOCKQ_MAXLENGTH, + &s->sink_input->sample_spec, + pa_usec_to_bytes(s->intended_latency - s->sink_latency, &s->sink_input->sample_spec), + 0, + 0, + &silence); + + pa_memblock_unref(silence.memblock); + + if (!(s->rtp_context = pa_rtp_context_new_recv(fd, sdp_info->payload, &s->sdp_info.sample_spec))) + goto fail; + + pa_hashmap_put(s->userdata->by_origin, s->sdp_info.origin, s); + u->n_sessions++; + PA_LLIST_PREPEND(struct session, s->userdata->sessions, s); + + pa_sink_input_put(s->sink_input); + + pa_log_info("New session '%s'", s->sdp_info.session_name); + + return s; + +fail: + pa_xfree(s); + + if (fd >= 0) + pa_close(fd); + + return NULL; +} + +static void session_free(struct session *s) { + pa_assert(s); + + pa_log_info("Freeing session '%s'", s->sdp_info.session_name); + + pa_sink_input_unlink(s->sink_input); + pa_sink_input_unref(s->sink_input); + + PA_LLIST_REMOVE(struct session, s->userdata->sessions, s); + pa_assert(s->userdata->n_sessions >= 1); + s->userdata->n_sessions--; + + pa_memblockq_free(s->memblockq); + pa_sdp_info_destroy(&s->sdp_info); + pa_rtp_context_free(s->rtp_context); + + 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; + bool goodbye = false; + pa_sdp_info info; + struct session *s; + + pa_assert(m); + pa_assert(e); + pa_assert(u); + pa_assert(fd == u->sap_context.fd); + pa_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) { + pa_hashmap_remove_and_free(u->by_origin, info.origin); + pa_sdp_info_destroy(&info); + } else { + + if (!(s = pa_hashmap_get(u->by_origin, info.origin))) { + if (!session_new(u, &info)) + pa_sdp_info_destroy(&info); + + } else { + struct timeval now; + pa_rtclock_get(&now); + pa_atomic_store(&s->timestamp, (int) now.tv_sec); + + pa_sdp_info_destroy(&info); + } + } +} + +static void check_death_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) { + struct session *s, *n; + struct userdata *u = userdata; + struct timeval now; + + pa_assert(m); + pa_assert(t); + pa_assert(u); + + pa_rtclock_get(&now); + + pa_log_debug("Checking for dead streams ..."); + + for (s = u->sessions; s; s = n) { + int k; + n = s->next; + + k = pa_atomic_load(&s->timestamp); + + if (k + DEATH_TIMEOUT < now.tv_sec) + pa_hashmap_remove_and_free(u->by_origin, s->sdp_info.origin); + } + + /* Restart timer */ + pa_core_rttime_restart(u->module->core, t, pa_rtclock_now() + DEATH_TIMEOUT * PA_USEC_PER_SEC); +} + +int pa__init(pa_module*m) { + struct userdata *u; + pa_modargs *ma = NULL; + struct sockaddr_in sa4; +#ifdef HAVE_IPV6 + struct sockaddr_in6 sa6; +#endif + struct sockaddr *sa; + socklen_t salen; + const char *sap_address; + uint32_t latency_msec; + int fd = -1; + + pa_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_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); +#ifdef HAVE_IPV6 + } else 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); +#endif + } else { + pa_log("Invalid SAP address '%s'", sap_address); + goto fail; + } + + latency_msec = DEFAULT_LATENCY_MSEC; + if (pa_modargs_get_value_u32(ma, "latency_msec", &latency_msec) < 0 || latency_msec < 1 || latency_msec > 300000) { + pa_log("Invalid latency specification"); + goto fail; + } + + if ((fd = mcast_socket(sa, salen)) < 0) + goto fail; + + m->userdata = u = pa_xnew(struct userdata, 1); + u->module = m; + u->core = m->core; + u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL)); + u->latency = (pa_usec_t) latency_msec * PA_USEC_PER_MSEC; + + u->sap_event = m->core->mainloop->io_new(m->core->mainloop, fd, PA_IO_EVENT_INPUT, sap_event_cb, u); + pa_sap_context_init_recv(&u->sap_context, fd); + + PA_LLIST_HEAD_INIT(struct session, u->sessions); + u->n_sessions = 0; + u->by_origin = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) session_free); + + u->check_death_event = pa_core_rttime_new(m->core, pa_rtclock_now() + DEATH_TIMEOUT * PA_USEC_PER_SEC, check_death_event_cb, u); + + pa_modargs_free(ma); + + return 0; + +fail: + if (ma) + pa_modargs_free(ma); + + if (fd >= 0) + pa_close(fd); + + return -1; +} + +void pa__done(pa_module*m) { + struct userdata *u; + + pa_assert(m); + + if (!(u = m->userdata)) + return; + + if (u->sap_event) + m->core->mainloop->io_free(u->sap_event); + + if (u->check_death_event) + m->core->mainloop->time_free(u->check_death_event); + + pa_sap_context_destroy(&u->sap_context); + + if (u->by_origin) + pa_hashmap_free(u->by_origin); + + pa_xfree(u->sink_name); + pa_xfree(u); +} |