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