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 extern struct gengetopt_args_info conf;
  36
  37 /** describes one entry in the list of targets for the ortp sender */
  38 struct ortp_target {
  39 /** address info */
  40         struct in_addr addr;
  41 /** whether the ortp sender is activated */
  42         int status;
  43 /** the ortp timestamp increases by this amount */
  44         int chunk_ts;
  45 /** the currently used timestamp for this target */
  46         int last_ts;
  47 /** the position of this target in the list of targets */
  48         struct list_head node;
  49 /** the UDP port */
  50         int port;
  51 /** non-zero if at least one chunk has been sent to this target */
  52         int streaming;
  53 /** the session pointer from libortp */
  54         RtpSession *session;
  55 };
  56
  57 static struct list_head targets;
  58 static struct sender *self;
  59
  60 static void ortp_delete_target(struct ortp_target *ot, const char *msg)
  61 {
  62         PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ot),
  63                 ot->port, msg);
  64         if (ot->session) {
  65                 rtp_session_destroy(ot->session);
  66                 ot->session = NULL;
  67         }
  68         list_del(&ot->node);
  69         free(ot);
  70 }
  71
  72 static void ortp_send_buf(char *buf, int len, long unsigned chunks_sent)
  73 {
  74         struct ortp_target *ot, *tmp;
  75         int ret;
  76
  77         list_for_each_entry_safe(ot, tmp, &targets, node) {
  78                 int ts;
  79                 if (!ot->session)
  80                         continue;
  81                 WRITE_CHUNK_TS(buf, ot->chunk_ts);
  82                 ts = ot->chunk_ts * chunks_sent;
  83                 ret = rtp_session_send_with_ts(ot->session, buf, len, ts);
  84                 ot->last_ts = ts;
  85                 if (ret < 0)
  86                         ortp_delete_target(ot, "send error");
  87                 if (ret != len +12)
  88                         PARA_NOTICE_LOG("short write %d\n", ret);
  89         }
  90 }
  91
  92 static void ortp_init_session(struct ortp_target *ot)
  93 {
  94         RtpSession *s;
  95         int ret;
  96
  97         PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ot), ot->port);
  98         ot->session = rtp_session_new(RTP_SESSION_SENDONLY);
  99         if (!ot->session)
 100                 return;
 101         s = ot->session;
 102         if (conf.ortp_jitter_compensation_arg) {
 103                 rtp_session_enable_adaptive_jitter_compensation(ot->session, TRUE);
 104                 rtp_session_set_jitter_compensation(ot->session,
 105                         conf.ortp_jitter_compensation_arg);
 106         }
 107         /* always successful */
 108         rtp_session_set_send_payload_type(s, PAYLOAD_AUDIO_CONTINUOUS);
 109         ret = rtp_session_set_remote_addr(s, TARGET_ADDR(ot), ot->port);
 110         if (ret < 0) {
 111                 rtp_session_destroy(ot->session);
 112                 ot->session = NULL;
 113         }
 114 }
 115
 116 /* called by afs */
 117 static void ortp_shutdown_targets(void)
 118 {
 119         char buf[ORTP_AUDIO_HEADER_LEN];
 120         struct ortp_target *ot, *tmp;
 121
 122         WRITE_PACKET_TYPE(buf, ORTP_EOF);
 123         list_for_each_entry_safe(ot, tmp, &targets, node) {
 124                 if (!ot->session || !ot->streaming)
 125                         continue;
 126                 PARA_INFO_LOG("sending eof to ortp target %s:%d, ts = %d\n",
 127                         TARGET_ADDR(ot), ot->port, ot->last_ts);
 128                 rtp_session_send_with_ts(ot->session, buf,
 129                         ORTP_AUDIO_HEADER_LEN, ot->last_ts);
 130                 ot->streaming = 0;
 131                 ot->chunk_ts = 0;
 132                 rtp_session_reset(ot->session);
 133         }
 134 }
 135
 136 static int need_extra_header(long unsigned current_chunk)
 137 {
 138         static struct timeval last_header;
 139         struct timeval now, diff;
 140
 141         if (!current_chunk)
 142                 return 0;
 143         gettimeofday(&now, NULL);
 144         tv_diff(&now, &last_header, &diff);
 145         if (tv2ms(&diff) < conf.ortp_header_interval_arg)
 146                 return 0;
 147         last_header = now;
 148         return 1;
 149 }
 150
 151 static void ortp_send(long unsigned current_chunk, long unsigned chunks_sent,
 152                 const char *buf, size_t len)
 153 {
 154         struct ortp_target *ot, *tmp;
 155         size_t sendbuf_len;
 156         int header_len = 0;
 157         int packet_type = ORTP_DATA;
 158         char *sendbuf, *header_buf = NULL;
 159         struct timeval *chunk_tv;
 160
 161         if (self->status != SENDER_ON)
 162                 return;
 163         chunk_tv = afs_chunk_time();
 164         if (!chunk_tv)
 165                 return;
 166         list_for_each_entry_safe(ot, tmp, &targets, node) {
 167                 if (!ot->session) {
 168                         ortp_init_session(ot);
 169                         if (!ot->session)
 170                                 continue;
 171                 }
 172                 if (!ot->chunk_ts)
 173                         ot->chunk_ts = rtp_session_time_to_ts(ot->session,
 174                                 tv2ms(chunk_tv));
 175 //              PARA_DEBUG_LOG("len: %d, ts: %lu, ts: %d\n",
 176 //                      len, ot->chunk_ts * chunks_sent, ot->chunk_ts);
 177                 ot->streaming = 1;
 178         }
 179         if (list_empty(&targets))
 180                 return;
 181         header_buf = afs_get_header(&header_len);
 182         if (!need_extra_header(current_chunk))
 183                 header_len = 0;
 184         sendbuf_len = ORTP_AUDIO_HEADER_LEN + header_len + len;
 185         sendbuf = para_malloc(sendbuf_len);
 186         if (!current_chunk)
 187                 packet_type = ORTP_BOF;
 188         else if (header_len)
 189                 packet_type = ORTP_HEADER;
 190         WRITE_PACKET_TYPE(sendbuf, packet_type);
 191         WRITE_CHUNK_TIME(sendbuf, chunk_tv->tv_usec);
 192         WRITE_STREAM_TYPE(sendbuf,  header_buf? 1 : 0);
 193         WRITE_HEADER_LEN(sendbuf, header_len);
 194         if (header_len)
 195                 memcpy(sendbuf + ORTP_AUDIO_HEADER_LEN, header_buf,
 196                         header_len);
 197         memcpy(sendbuf + ORTP_AUDIO_HEADER_LEN + header_len, buf, len);
 198         ortp_send_buf(sendbuf, sendbuf_len, chunks_sent);
 199         free(sendbuf);
 200 }
 201
 202 static int ortp_com_on(__a_unused struct sender_command_data *scd)
 203 {
 204
 205         self->status = SENDER_ON;
 206         return 1;
 207 }
 208
 209 static int ortp_com_off(__a_unused struct sender_command_data *scd)
 210 {
 211         ortp_shutdown_targets();
 212         self->status = SENDER_OFF;
 213         return 1;
 214 }
 215
 216 static int ortp_com_delete(struct sender_command_data *scd)
 217 {
 218         char *a = para_strdup(inet_ntoa(scd->addr));
 219         struct ortp_target *ot, *tmp;
 220         list_for_each_entry_safe(ot, tmp, &targets, node) {
 221                 if (scd->port != ot->port)
 222                         continue;
 223                 if (strcmp(TARGET_ADDR(ot), a))
 224                         continue;
 225                 ortp_delete_target(ot, "com_delete");
 226         }
 227         return 1;
 228 }
 229
 230 static void ortp_add_target(int port, struct in_addr *addr)
 231 {
 232         struct ortp_target *ot = para_calloc(sizeof(struct ortp_target));
 233         ot->port = port;
 234         ot->addr = *addr;
 235         PARA_INFO_LOG("adding to target list (%s:%d)\n",
 236                 TARGET_ADDR(ot), ot->port);
 237         list_add(&ot->node, &targets);
 238 }
 239
 240 static int ortp_com_add(struct sender_command_data *scd)
 241 {
 242         int port = (scd->port > 0)? scd->port : conf.ortp_default_port_arg;
 243         ortp_add_target(port, &scd->addr);
 244         return 1;
 245 }
 246
 247 static char *ortp_info(void)
 248 {
 249         struct ortp_target *ot;
 250         char *ret, *tgts = NULL;
 251
 252         list_for_each_entry(ot, &targets, node) {
 253                 char *tmp = make_message("%s%s:%d ", tgts? tgts : "",
 254                         TARGET_ADDR(ot), ot->port);
 255                 free(tgts);
 256                 tgts = tmp;
 257         }
 258         ret = make_message(
 259                 "ortp status: %s\n"
 260                 "ortp default port: udp %d\n"
 261                 "ortp targets: %s\n",
 262                 (self->status == SENDER_ON)? "on" : "off",
 263                 conf.ortp_default_port_arg,
 264                 tgts? tgts : "(none)"
 265         );
 266         free(tgts);
 267         return ret;
 268 }
 269
 270 static void ortp_init_target_list(void)
 271 {
 272         int i;
 273
 274         INIT_LIST_HEAD(&targets);
 275         for (i = 0; i < conf.ortp_target_given; i++) {
 276                 char *arg = para_strdup(conf.ortp_target_arg[i]);
 277                 char *p = strchr(arg, ':');
 278                 int port;
 279                 struct in_addr addr;
 280
 281                 if (!p)
 282                         goto err;
 283                 *p = '\0';
 284                 if (!inet_aton(arg, &addr))
 285                         goto err;
 286                 port = atoi(++p);
 287                 if (port < 0 || port > 65535)
 288                         port = conf.ortp_default_port_arg;
 289                 ortp_add_target(port, &addr);
 290                 goto success;
 291 err:
 292                 PARA_CRIT_LOG("syntax error for ortp_target option "
 293                         "#%d, ignoring\n", i);
 294 success:
 295                 free(arg);
 296                 continue;
 297         }
 298 }
 299
 300 static void ortp_pre_select(__a_unused  int *max_fileno, __a_unused fd_set *rfds,
 301         __a_unused fd_set *wfds)
 302 {
 303         return;
 304 }
 305
 306 static char *ortp_help(void)
 307 {
 308         return make_message(
 309                 "usage: {on|off}\n"
 310                 "usage: {add|delete} IP port\n"
 311                 "example: add 224.0.1.38 1500 (LAN-streaming)\n"
 312         );
 313 }
 314
 315 /**
 316  * the init function of para_server's ortp sender
 317  *
 318  * \param s pointer to the http sender struct
 319  *
 320  * It initializes all function pointers of \a s and the list of ortp targets.
 321  */
 322 void ortp_send_init(struct sender *s)
 323 {
 324         ortp_init();
 325         INIT_LIST_HEAD(&targets);
 326         s->info = ortp_info;
 327         s->help = ortp_help;
 328         s->send = ortp_send;
 329         s->pre_select = ortp_pre_select;
 330         s->post_select = NULL;
 331         s->shutdown_clients = ortp_shutdown_targets;
 332         s->client_cmds[SENDER_ON] = ortp_com_on;
 333         s->client_cmds[SENDER_OFF] = ortp_com_off;
 334         s->client_cmds[SENDER_DENY] = NULL;
 335         s->client_cmds[SENDER_ALLOW] = NULL;
 336         s->client_cmds[SENDER_ADD] = ortp_com_add;
 337         s->client_cmds[SENDER_DELETE] = ortp_com_delete;
 338         self = s;
 339         s->status = SENDER_OFF;
 340         ortp_init_target_list();
 341         if (!conf.ortp_no_autostart_given)
 342                 s->status = SENDER_ON;
 343         PARA_DEBUG_LOG("%s", "ortp sender init complete\n");
 344 }