ortp_send.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file ortp_send.c para_server's ortp sender */
  20
  21 #include <ortp/ortp.h>
  22
  23 #include "server.cmdline.h"
  24 #include "server.h"
  25 #include "afs.h"
  26 #include "send.h"
  27 #include "list.h"
  28 #include "ortp.h"
  29 #include "string.h"
  30
  31 /** \cond convert in_addr to ascii */
  32 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
  33 /** \endcond */
  34
  35 /** describes one entry in the list of targets for the ortp sender */
  36 struct ortp_target {
  37 /** address info */
  38         struct in_addr addr;
  39 /** whether the ortp sender is activated */
  40         int status;
  41 /** the ortp timestamp increases by this amount */
  42         int chunk_ts;
  43 /** the currently used timestamp for this target */
  44         int last_ts;
  45 /** the position of this target in the list of targets */
  46         struct list_head node;
  47 /** the UDP port */
  48         int port;
  49 /** non-zero if at least one chunk has been sent to this target */
  50         int streaming;
  51 /** the session pointer from libortp */
  52         RtpSession *session;
  53 };
  54
  55 static struct list_head targets;
  56 static struct sender *self;
  57
  58 static void ortp_delete_target(struct ortp_target *ot, const char *msg)
  59 {
  60         PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ot),
  61                 ot->port, msg);
  62         if (ot->session) {
  63                 rtp_session_destroy(ot->session);
  64                 ot->session = NULL;
  65         }
  66         list_del(&ot->node);
  67         free(ot);
  68 }
  69
  70 static void ortp_send_buf(char *buf, int len, long unsigned chunks_sent)
  71 {
  72         struct ortp_target *ot, *tmp;
  73         int ret;
  74
  75         list_for_each_entry_safe(ot, tmp, &targets, node) {
  76                 int ts;
  77                 if (!ot->session)
  78                         continue;
  79                 WRITE_CHUNK_TS(buf, ot->chunk_ts);
  80                 ts = ot->chunk_ts * chunks_sent;
  81                 ret = rtp_session_send_with_ts(ot->session,
  82                         (unsigned char*)buf, len, ts);
  83                 ot->last_ts = ts;
  84                 if (ret < 0)
  85                         ortp_delete_target(ot, "send error");
  86                 if (ret != len + 12)
  87                         PARA_NOTICE_LOG("short write %d\n", ret);
  88         }
  89 }
  90
  91 static int set_multicast(RtpSession *s)
  92 {
  93         unsigned char loop = 1;
  94         int ret;
  95
  96         ret = setsockopt(s->rtp.socket,
  97                 IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop));
  98         if (ret < 0) {
  99                 PARA_ERROR_LOG("IP_MULTICAST_LOOP error %d\n", ret);
 100
 101         }
 102         return 1;
 103 }
 104
 105 static void ortp_init_session(struct ortp_target *ot)
 106 {
 107         RtpSession *s;
 108         int ret;
 109
 110         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ot), ot->port);
 111         ot->session = rtp_session_new(RTP_SESSION_SENDONLY);
 112         if (!ot->session)
 113                 return;
 114         s = ot->session;
 115         if (conf.ortp_jitter_compensation_arg) {
 116                 rtp_session_enable_adaptive_jitter_compensation(ot->session, TRUE);
 117                 rtp_session_set_jitter_compensation(ot->session,
 118                         conf.ortp_jitter_compensation_arg);
 119         }
 120         /* always successful */
 121         rtp_session_set_send_payload_type(s, PAYLOAD_AUDIO_CONTINUOUS);
 122         ret = rtp_session_set_remote_addr(s, TARGET_ADDR(ot), ot->port);
 123         if (ret < 0) {
 124                 rtp_session_destroy(ot->session);
 125                 ot->session = NULL;
 126                 return;
 127         }
 128         set_multicast(s);
 129 }
 130
 131 /* called by afs */
 132 static void ortp_shutdown_targets(void)
 133 {
 134         unsigned char buf[ORTP_AUDIO_HEADER_LEN];
 135         struct ortp_target *ot, *tmp;
 136
 137         WRITE_PACKET_TYPE(buf, ORTP_EOF);
 138         list_for_each_entry_safe(ot, tmp, &targets, node) {
 139                 if (!ot->session || !ot->streaming)
 140                         continue;
 141                 PARA_INFO_LOG("sending eof to ortp target %s:%d, ts = %d\n",
 142                         TARGET_ADDR(ot), ot->port, ot->last_ts);
 143                 rtp_session_send_with_ts(ot->session, buf,
 144                         ORTP_AUDIO_HEADER_LEN, ot->last_ts);
 145                 ot->streaming = 0;
 146                 ot->chunk_ts = 0;
 147                 rtp_session_reset(ot->session);
 148         }
 149 }
 150
 151 static int need_extra_header(long unsigned current_chunk)
 152 {
 153         static struct timeval last_header;
 154         struct timeval now, diff;
 155
 156         if (!current_chunk)
 157                 return 0;
 158         gettimeofday(&now, NULL);
 159         tv_diff(&now, &last_header, &diff);
 160         if (tv2ms(&diff) < conf.ortp_header_interval_arg)
 161                 return 0;
 162         last_header = now;
 163         return 1;
 164 }
 165
 166 static void ortp_send(long unsigned current_chunk, long unsigned chunks_sent,
 167                 const char *buf, size_t len)
 168 {
 169         struct ortp_target *ot, *tmp;
 170         size_t sendbuf_len;
 171         int header_len = 0;
 172         int packet_type = ORTP_DATA;
 173         char *sendbuf, *header_buf = NULL;
 174         struct timeval *chunk_tv;
 175
 176         if (self->status != SENDER_ON)
 177                 return;
 178         chunk_tv = afs_chunk_time();
 179         if (!chunk_tv)
 180                 return;
 181         list_for_each_entry_safe(ot, tmp, &targets, node) {
 182                 if (!ot->session) {
 183                         ortp_init_session(ot);
 184                         if (!ot->session)
 185                                 continue;
 186                 }
 187                 if (!ot->chunk_ts)
 188                         ot->chunk_ts = rtp_session_time_to_ts(ot->session,
 189                                 tv2ms(chunk_tv));
 190 //              PARA_DEBUG_LOG("len: %d, ts: %lu, ts: %d\n",
 191 //                      len, ot->chunk_ts * chunks_sent, ot->chunk_ts);
 192                 ot->streaming = 1;
 193         }
 194         if (list_empty(&targets))
 195                 return;
 196         header_buf = afs_get_header(&header_len);
 197         if (!need_extra_header(current_chunk))
 198                 header_len = 0;
 199         sendbuf_len = ORTP_AUDIO_HEADER_LEN + header_len + len;
 200         sendbuf = para_malloc(sendbuf_len);
 201         if (!current_chunk)
 202                 packet_type = ORTP_BOF;
 203         else if (header_len)
 204                 packet_type = ORTP_HEADER;
 205         WRITE_PACKET_TYPE(sendbuf, packet_type);
 206         WRITE_CHUNK_TIME(sendbuf, chunk_tv->tv_usec);
 207         WRITE_STREAM_TYPE(sendbuf,  header_buf? 1 : 0);
 208         WRITE_HEADER_LEN(sendbuf, header_len);
 209         if (header_len)
 210                 memcpy(sendbuf + ORTP_AUDIO_HEADER_LEN, header_buf,
 211                         header_len);
 212         memcpy(sendbuf + ORTP_AUDIO_HEADER_LEN + header_len, buf, len);
 213         ortp_send_buf(sendbuf, sendbuf_len, chunks_sent);
 214         free(sendbuf);
 215 }
 216
 217 static int ortp_com_on(__a_unused struct sender_command_data *scd)
 218 {
 219
 220         self->status = SENDER_ON;
 221         return 1;
 222 }
 223
 224 static int ortp_com_off(__a_unused struct sender_command_data *scd)
 225 {
 226         ortp_shutdown_targets();
 227         self->status = SENDER_OFF;
 228         return 1;
 229 }
 230
 231 static int ortp_com_delete(struct sender_command_data *scd)
 232 {
 233         char *a = para_strdup(inet_ntoa(scd->addr));
 234         struct ortp_target *ot, *tmp;
 235         list_for_each_entry_safe(ot, tmp, &targets, node) {
 236                 if (scd->port != ot->port)
 237                         continue;
 238                 if (strcmp(TARGET_ADDR(ot), a))
 239                         continue;
 240                 ortp_delete_target(ot, "com_delete");
 241         }
 242         return 1;
 243 }
 244
 245 static void ortp_add_target(int port, struct in_addr *addr)
 246 {
 247         struct ortp_target *ot = para_calloc(sizeof(struct ortp_target));
 248         ot->port = port;
 249         ot->addr = *addr;
 250         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 251                 TARGET_ADDR(ot), ot->port);
 252         para_list_add(&ot->node, &targets);
 253 }
 254
 255 static int ortp_com_add(struct sender_command_data *scd)
 256 {
 257         int port = (scd->port > 0)? scd->port : conf.ortp_default_port_arg;
 258         ortp_add_target(port, &scd->addr);
 259         return 1;
 260 }
 261
 262 static char *ortp_info(void)
 263 {
 264         struct ortp_target *ot;
 265         char *ret, *tgts = NULL;
 266
 267         list_for_each_entry(ot, &targets, node) {
 268                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 269                         TARGET_ADDR(ot), ot->port);
 270                 free(tgts);
 271                 tgts = tmp;
 272         }
 273         ret = make_message(
 274                 "ortp status: %s\n"
 275                 "ortp default port: udp %d\n"
 276                 "ortp targets: %s\n",
 277                 (self->status == SENDER_ON)? "on" : "off",
 278                 conf.ortp_default_port_arg,
 279                 tgts? tgts : "(none)"
 280         );
 281         free(tgts);
 282         return ret;
 283 }
 284
 285 static void ortp_init_target_list(void)
 286 {
 287         int i;
 288
 289         INIT_LIST_HEAD(&targets);
 290         for (i = 0; i < conf.ortp_target_given; i++) {
 291                 char *arg = para_strdup(conf.ortp_target_arg[i]);
 292                 char *p = strchr(arg, ':');
 293                 int port;
 294                 struct in_addr addr;
 295
 296                 if (!p)
 297                         goto err;
 298                 *p = '\0';
 299                 if (!inet_aton(arg, &addr))
 300                         goto err;
 301                 port = atoi(++p);
 302                 if (port < 0 || port > 65535)
 303                         port = conf.ortp_default_port_arg;
 304                 ortp_add_target(port, &addr);
 305                 goto success;
 306 err:
 307                 PARA_CRIT_LOG("syntax error for ortp_target option "
 308                         "#%d, ignoring\n", i);
 309 success:
 310                 free(arg);
 311                 continue;
 312         }
 313 }
 314
 315 static void ortp_pre_select(__a_unused  int *max_fileno, __a_unused fd_set *rfds,
 316         __a_unused fd_set *wfds)
 317 {
 318         return;
 319 }
 320
 321 static char *ortp_help(void)
 322 {
 323         return make_message(
 324                 "usage: {on|off}\n"
 325                 "usage: {add|delete} IP port\n"
 326                 "example: add 224.0.1.38 1500 (LAN-streaming)\n"
 327         );
 328 }
 329
 330 /**
 331  * the init function of para_server's ortp sender
 332  *
 333  * \param s pointer to the http sender struct
 334  *
 335  * It initializes all function pointers of \a s and the list of ortp targets.
 336  */
 337 void ortp_send_init(struct sender *s)
 338 {
 339         ortp_init();
 340         INIT_LIST_HEAD(&targets);
 341         s->info = ortp_info;
 342         s->help = ortp_help;
 343         s->send = ortp_send;
 344         s->pre_select = ortp_pre_select;
 345         s->post_select = NULL;
 346         s->shutdown_clients = ortp_shutdown_targets;
 347         s->client_cmds[SENDER_ON] = ortp_com_on;
 348         s->client_cmds[SENDER_OFF] = ortp_com_off;
 349         s->client_cmds[SENDER_DENY] = NULL;
 350         s->client_cmds[SENDER_ALLOW] = NULL;
 351         s->client_cmds[SENDER_ADD] = ortp_com_add;
 352         s->client_cmds[SENDER_DELETE] = ortp_com_delete;
 353         self = s;
 354         s->status = SENDER_OFF;
 355         ortp_init_target_list();
 356         if (!conf.ortp_no_autostart_given)
 357                 s->status = SENDER_ON;
 358         PARA_DEBUG_LOG("%s", "ortp sender init complete\n");
 359 }