ortp_recv.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 /** \file ortp_recv.c paraslash's ortp receiver */
  19
  20 #include <ortp/ortp.h>
  21 #include "para.h"
  22
  23 #include "ortp.h"
  24 #include "list.h"
  25 #include "sched.h"
  26 #include "recv.h"
  27 #include "ortp_recv.cmdline.h"
  28
  29 #include "error.h"
  30 #include "audiod.h"
  31 #include "string.h"
  32
  33 #define CHUNK_SIZE 128 * 1024
  34
  35 extern int msg_to_buf(mblk_t *, char *, int);
  36
  37 /**
  38  * data specific to the ortp receiver
  39  *
  40  * \sa receiver receiver_node
  41  */
  42 struct private_ortp_recv_data {
  43
  44 /**
  45  *
  46  *
  47  * whether a header was received
  48  *
  49  * A flag indicating whether the ortp receiver already received a packet which
  50  * contains the audio file header.
  51  *
  52  * This flag has no effect if the audio stream indicates that no extra headers
  53  * will be sent (mp3).  Otherwise, all data packets are dropped until the
  54  * header is received.
  55  */
  56 int have_header;
  57 /** the ortp session this instance of the receiver belongs to */
  58 RtpSession *session;
  59 /** the time the first data or header packet was received */
  60 struct timeval start;
  61 /** ETA of the next chunk */
  62 struct timeval next_chunk;
  63 /** number of consecutive bad chunks */
  64 int c_bad;
  65 /** the current timestamp which is passed to the receiving function of libortp */
  66 uint32_t timestamp;
  67 /** \a timestamp increases by this amount */
  68 uint32_t chunk_ts;
  69 };
  70
  71 static void ortp_recv_pre_select(struct sched *s, struct task *t)
  72 {
  73         struct receiver_node *rn = t->private_data;
  74         struct private_ortp_recv_data *pord = rn->private_data;
  75         struct timeval tmp;
  76
  77         if (tv_diff(&s->now, &pord->next_chunk, &tmp) >= 0) {
  78                 tmp.tv_sec = 0;
  79                 tmp.tv_usec = 1000;
  80         }
  81         if (tv_diff(&s->timeout, &tmp, NULL) > 0)
  82                 s->timeout = tmp;
  83         t->ret = 1;
  84 }
  85
  86 static void compute_next_chunk(unsigned chunk_time,
  87                 struct private_ortp_recv_data *pord)
  88 {
  89         struct timeval chunk_tv = {0, chunk_time};
  90         struct timeval tmp;
  91
  92         tv_add(&chunk_tv, &pord->next_chunk, &tmp);
  93         pord->next_chunk = tmp;
  94         pord->timestamp += pord->chunk_ts;
  95         PARA_DEBUG_LOG("next chunk (ts = %d) due at %lu:%lu\n",
  96                 pord->timestamp, pord->next_chunk.tv_sec,
  97                 pord->next_chunk.tv_usec);
  98 }
  99
 100 static void ortp_recv_post_select(struct sched *s, struct task *t)
 101 {
 102         struct receiver_node *rn = t->private_data;
 103         struct private_ortp_recv_data *pord = rn->private_data;
 104         mblk_t *mp;
 105         int packet_type, stream_type;
 106         char tmpbuf[CHUNK_SIZE + 3];
 107         unsigned chunk_time;
 108
 109 //      PARA_INFO_LOG("rn: %p, pord: %p, session: %p\n", rn, pord, pord->session);
 110         t->ret = 1;
 111         if (pord->start.tv_sec)
 112                 if (tv_diff(&s->now, &pord->next_chunk, NULL) < 0)
 113                         return;
 114         mp = rtp_session_recvm_with_ts(pord->session, pord->timestamp);
 115         if (!mp) {
 116                 struct timeval min_delay = {0, 100};
 117 //              PARA_INFO_LOG("nope, chunk_ts = %d, loaded: %d, bad: %d\n",
 118 //                      pord->timestamp, rn->loaded, pord->c_bad);
 119                 pord->c_bad++;
 120                 t->ret = -E_TOO_MANY_BAD_CHUNKS;
 121                 if ((pord->c_bad > 5000 && pord->start.tv_sec) || pord->c_bad > 10000)
 122                         return;
 123                 t->ret = 1;
 124                 tv_add(&s->now, &min_delay, &pord->next_chunk);
 125                 return;
 126         }
 127         /* okay, we have a chunk of data */
 128         if (!pord->start.tv_sec)
 129                 pord->start = s->now;
 130         t->ret = msg_to_buf(mp, tmpbuf, CHUNK_SIZE);
 131         if (t->ret < ORTP_AUDIO_HEADER_LEN) {
 132                 rn->eof = 1;
 133                 if (t->ret < 0)
 134                         t->ret = -E_MSG_TO_BUF;
 135                 else
 136                         t->ret = -E_ORTP_RECV_EOF;
 137                 goto err_out;
 138         }
 139         packet_type = READ_PACKET_TYPE(tmpbuf);
 140         stream_type = READ_STREAM_TYPE(tmpbuf);
 141         chunk_time = READ_CHUNK_TIME(tmpbuf);
 142         pord->chunk_ts = READ_CHUNK_TS(tmpbuf);
 143 //      PARA_INFO_LOG("packet type: %d, stream type: %d, chunk time: %u,"
 144 //              " chunk_ts: %u, loaded: %u, bad: %d\n", packet_type,
 145 //              stream_type, chunk_time, pord->chunk_ts, rn->loaded, pord->c_bad);
 146         switch (packet_type) {
 147         unsigned header_len, payload_len;
 148         case ORTP_EOF:
 149                 rn->eof = 1;
 150                 t->ret = -E_ORTP_RECV_EOF;
 151                 goto err_out;
 152         case ORTP_BOF:
 153                 PARA_INFO_LOG("bof (%d)\n", t->ret);
 154                 pord->have_header = 1;
 155                 /* fall through */
 156         case ORTP_DATA:
 157                 if (!pord->have_header && stream_type)
 158                 /* can't use the data, wait for header */
 159                         goto success;
 160                 if (t->ret + rn->loaded >= CHUNK_SIZE + ORTP_AUDIO_HEADER_LEN) {
 161                         t->ret = -E_OVERRUN;
 162                         goto err_out;
 163                 }
 164                 if (t->ret > ORTP_AUDIO_HEADER_LEN) {
 165                         memcpy(rn->buf + rn->loaded, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 166                                 t->ret - ORTP_AUDIO_HEADER_LEN);
 167                         rn->loaded += t->ret - ORTP_AUDIO_HEADER_LEN;
 168                 }
 169                 goto success;
 170         case ORTP_HEADER:
 171                 header_len = READ_HEADER_LEN(tmpbuf);
 172                 PARA_DEBUG_LOG("header packet (%d bytes), header len: %d\n",
 173                         t->ret, header_len);
 174                 if (!pord->have_header) {
 175                         pord->have_header = 1;
 176                         memcpy(rn->buf, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 177                                 t->ret - ORTP_AUDIO_HEADER_LEN);
 178                         rn->loaded = t->ret - ORTP_AUDIO_HEADER_LEN;
 179                         goto success;
 180                 }
 181                 if (header_len + ORTP_AUDIO_HEADER_LEN > t->ret) {
 182                         t->ret = -E_INVALID_HEADER;
 183                         goto err_out;
 184                 }
 185                 payload_len = t->ret - ORTP_AUDIO_HEADER_LEN - header_len;
 186 //              PARA_INFO_LOG("len: %d header_len: %d, payload_len: %d, loaded: %d\n", ret,
 187 //                      header_len, payload_len, rn->loaded);
 188                 if (rn->loaded + payload_len > CHUNK_SIZE) {
 189                         t->ret = -E_OVERRUN;
 190                         goto err_out;
 191                 }
 192                 if (payload_len)
 193                         memcpy(rn->buf + rn->loaded, tmpbuf
 194                                 + (t->ret - payload_len), payload_len);
 195                 rn->loaded += payload_len;
 196                 goto success;
 197         }
 198 success:
 199         t->ret = 1;
 200         freemsg(mp);
 201         if (pord->c_bad) {
 202                 pord->c_bad = 0;
 203                 pord->next_chunk = s->now;
 204         }
 205         compute_next_chunk(chunk_time, pord);
 206         return;
 207 err_out:
 208         freemsg(mp);
 209         return;
 210 }
 211
 212 static void ortp_shutdown(void)
 213 {
 214 //      ortp_global_stats_display();
 215         ortp_exit();
 216 }
 217
 218 static void ortp_recv_close(struct receiver_node *rn)
 219 {
 220         struct private_ortp_recv_data *pord = rn->private_data;
 221
 222         rtp_session_destroy(pord->session);
 223         free(rn->private_data);
 224         free(rn->buf);
 225 }
 226
 227 static void *ortp_recv_parse_config(int argc, char **argv)
 228 {
 229         int ret;
 230
 231         struct ortp_recv_args_info *tmp = para_calloc(sizeof(struct ortp_recv_args_info));
 232
 233         ret = ortp_recv_cmdline_parser(argc, argv, tmp)? -E_ORTP_SYNTAX : 1;
 234         if (ret > 0)
 235                 return tmp;
 236         free(tmp);
 237         return NULL;
 238 }
 239
 240 static int ortp_recv_open(struct receiver_node *rn)
 241 {
 242         struct private_ortp_recv_data *pord;
 243         struct ortp_recv_args_info *conf = rn->conf;
 244
 245         rn->buf = para_calloc(CHUNK_SIZE);
 246
 247         rn->private_data = para_calloc(sizeof(struct private_ortp_recv_data));
 248         pord = rn->private_data;
 249         pord->session = rtp_session_new(RTP_SESSION_RECVONLY);
 250         PARA_NOTICE_LOG("receiving from %s:%d\n", conf->host_arg, conf->port_arg);
 251         rtp_session_set_local_addr(pord->session, conf->host_arg, conf->port_arg);
 252         rtp_session_set_payload_type(pord->session, PAYLOAD_AUDIO_CONTINUOUS);
 253         if (conf->jitter_compensation_arg) {
 254                 rtp_session_enable_adaptive_jitter_compensation(pord->session, TRUE);
 255                 rtp_session_set_jitter_compensation(pord->session,
 256                         conf->jitter_compensation_arg);
 257         }
 258         return 1;
 259 }
 260
 261 /**
 262  * the init function of the ortp receiver
 263  *
 264  * \param r pointer to the receiver struct to initialize
 265  *
 266  * Initialize all function pointers of \a r and call libortp's ortp_init().
 267  */
 268 void ortp_recv_init(struct receiver *r)
 269 {
 270         r->shutdown = ortp_shutdown;
 271         r->open = ortp_recv_open;
 272         r->close = ortp_recv_close;
 273         r->pre_select = ortp_recv_pre_select;
 274         r->post_select = ortp_recv_post_select;
 275         r->parse_config = ortp_recv_parse_config;
 276
 277         ortp_init();
 278 }