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|
/***
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 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 <config.h>
#endif
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <poll.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-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/namereg.h>
#include <pulsecore/sample-util.h>
#include <pulsecore/macro.h>
#include <pulsecore/atomic.h>
#include <pulsecore/rtclock.h>
#include <pulsecore/atomic.h>
#include <pulsecore/time-smoother.h>
#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_LOAD_ONCE(FALSE);
PA_MODULE_USAGE(
"sink=<name of the sink> "
"sap_address=<multicast address to listen on> "
);
#define SAP_PORT 9875
#define DEFAULT_SAP_ADDRESS "224.0.0.56"
#define MEMBLOCKQ_MAXLENGTH (1024*1024*40)
#define MAX_SESSIONS 16
#define DEATH_TIMEOUT 20
#define RATE_UPDATE_INTERVAL (5*PA_USEC_PER_SEC)
#define LATENCY_USEC (500*PA_USEC_PER_MSEC)
static const char* const valid_modargs[] = {
"sink",
"sap_address",
NULL
};
struct session {
struct userdata *userdata;
PA_LLIST_FIELDS(struct session);
pa_sink_input *sink_input;
pa_memblockq *memblockq;
pa_bool_t first_packet;
uint32_t ssrc;
uint32_t offset;
struct pa_sdp_info sdp_info;
pa_rtp_context rtp_context;
pa_rtpoll_item *rtpoll_item;
pa_atomic_t timestamp;
pa_smoother *smoother;
pa_usec_t intended_latency;
pa_usec_t sink_latency;
pa_usec_t last_rate_update;
};
struct userdata {
pa_module *module;
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;
};
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 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);
session_free(s);
}
/* Called from I/O thread context */
static int rtpoll_work_cb(pa_rtpoll_item *i) {
pa_memchunk chunk;
int64_t k, j, delta;
struct timeval now;
struct session *s;
struct pollfd *p;
pa_assert_se(s = pa_rtpoll_item_get_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) < 0)
return 0;
if (s->sdp_info.payload != s->rtp_context.payload) {
pa_memblock_unref(chunk.memblock);
return 0;
}
if (!s->first_packet) {
s->first_packet = TRUE;
s->ssrc = s->rtp_context.ssrc;
s->offset = s->rtp_context.timestamp;
if (s->ssrc == s->userdata->module->core->cookie)
pa_log_warn("Detected RTP packet loop!");
} else {
if (s->ssrc != s->rtp_context.ssrc) {
pa_memblock_unref(chunk.memblock);
return 0;
}
}
/* 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 * (int64_t) s->rtp_context.frame_size, PA_SEEK_RELATIVE);
pa_rtclock_get(&now);
pa_smoother_put(s->smoother, pa_timeval_load(&now), pa_bytes_to_usec((uint64_t) pa_memblockq_get_write_index(s->memblockq), &s->sink_input->sample_spec));
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);
}
/* pa_log("blocks in q: %u", pa_memblockq_get_nblocks(s->memblockq)); */
pa_memblock_unref(chunk.memblock);
/* The next timestamp we expect */
s->offset = s->rtp_context.timestamp + (uint32_t) (chunk.length / s->rtp_context.frame_size);
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, fix;
unsigned fix_samples;
pa_log("Updating sample rate");
wi = pa_smoother_get(s->smoother, pa_timeval_load(&now));
ri = pa_bytes_to_usec((uint64_t) pa_memblockq_get_read_index(s->memblockq), &s->sink_input->sample_spec);
if (PA_MSGOBJECT(s->sink_input->sink)->process_msg(PA_MSGOBJECT(s->sink_input->sink), PA_SINK_MESSAGE_GET_LATENCY, &sink_delay, 0, NULL) < 0)
sink_delay = 0;
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);
/* Calculate deviation */
if (latency < s->intended_latency)
fix = s->intended_latency - latency;
else
fix = latency - s->intended_latency;
/* How many samples is this per second? */
fix_samples = (unsigned) (fix * (pa_usec_t) s->sink_input->thread_info.sample_spec.rate / (pa_usec_t) RATE_UPDATE_INTERVAL);
/* Check if deviation is in bounds */
if (fix_samples > s->sink_input->sample_spec.rate*.20)
pa_log_debug("Hmmm, rate fix is too large (%lu Hz), not applying.", (unsigned long) fix_samples);
/* Fix up rate */
if (latency < s->intended_latency)
s->sink_input->sample_spec.rate -= fix_samples;
else
s->sink_input->sample_spec.rate += fix_samples;
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, 0, FALSE, TRUE);
}
return 1;
}
/* Called from I/O thread context */
static void sink_input_attach(pa_sink_input *i) {
struct session *s;
struct pollfd *p;
pa_sink_input_assert_ref(i);
pa_assert_se(s = i->userdata);
pa_assert(!s->rtpoll_item);
s->rtpoll_item = pa_rtpoll_item_new(i->sink->rtpoll, PA_RTPOLL_LATE, 1);
p = pa_rtpoll_item_get_pollfd(s->rtpoll_item, NULL);
p->fd = s->rtp_context.fd;
p->events = POLLIN;
p->revents = 0;
pa_rtpoll_item_set_work_callback(s->rtpoll_item, rtpoll_work_cb);
pa_rtpoll_item_set_userdata(s->rtpoll_item, 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 = 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;
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, TRUE))) {
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 = LATENCY_USEC;
s->smoother = pa_smoother_new(PA_USEC_PER_SEC*5, PA_USEC_PER_SEC*2, TRUE, 10);
pa_smoother_set_time_offset(s->smoother, pa_timeval_load(&now));
s->last_rate_update = pa_timeval_load(&now);
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);
data.sink = sink;
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);
s->sink_input = pa_sink_input_new(u->module->core, &data, 0);
pa_sink_input_new_data_done(&data);
if (!s->sink_input) {
pa_log("Failed to create sink input.");
goto fail;
}
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;
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(
0,
MEMBLOCKQ_MAXLENGTH,
MEMBLOCKQ_MAXLENGTH,
pa_frame_size(&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);
pa_rtp_context_init_recv(&s->rtp_context, fd, pa_frame_size(&s->sdp_info.sample_spec));
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_hashmap_remove(s->userdata->by_origin, s->sdp_info.origin);
pa_memblockq_free(s->memblockq);
pa_sdp_info_destroy(&s->sdp_info);
pa_rtp_context_destroy(&s->rtp_context);
pa_smoother_free(s->smoother);
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;
pa_bool_t 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) {
if ((s = pa_hashmap_get(u->by_origin, info.origin)))
session_free(s);
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 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 *ptv, void *userdata) {
struct session *s, *n;
struct userdata *u = userdata;
struct timeval now;
struct timeval tv;
pa_assert(m);
pa_assert(t);
pa_assert(ptv);
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)
session_free(s);
}
/* Restart timer */
pa_gettimeofday(&tv);
pa_timeval_add(&tv, DEATH_TIMEOUT*PA_USEC_PER_SEC);
m->time_restart(t, &tv);
}
int pa__init(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;
struct timeval tv;
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_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->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
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(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
pa_gettimeofday(&tv);
pa_timeval_add(&tv, DEATH_TIMEOUT * PA_USEC_PER_SEC);
u->check_death_event = m->core->mainloop->time_new(m->core->mainloop, &tv, 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;
struct session *s;
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) {
while ((s = pa_hashmap_first(u->by_origin)))
session_free(s);
pa_hashmap_free(u->by_origin, NULL, NULL);
}
pa_xfree(u->sink_name);
pa_xfree(u);
}
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