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  * whether a header was received
  47  *
  48  * A flag indicating whether the ortp receiver already received a packet which
  49  * contains the audio file header.
  50  *
  51  * This flag has no effect if the audio stream indicates that no extra headers
  52  * will be sent (mp3).  Otherwise, all data packets are dropped until the
  53  * header is received.
  54  */
  55 int have_header;
  56 /** the ortp session this instance of the receiver belongs to */
  57 RtpSession *session;
  58 /** the time the first data or header packet was received */
  59 struct timeval start;
  60 /** ETA of the next chunk */
  61 struct timeval next_chunk;
  62 /** number of consecutive bad chunks */
  63 int c_bad;
  64 /** the current timestamp which is passed to the receiving function of libortp */
  65 uint32_t timestamp;
  66 /** \a timestamp increases by this amount */
  67 uint32_t chunk_ts;
  68 };
  69
  70 static void ortp_recv_pre_select(struct sched *s, struct task *t)
  71 {
  72         struct receiver_node *rn = t->private_data;
  73         struct private_ortp_recv_data *pord = rn->private_data;
  74         struct timeval tmp;
  75
  76         if (tv_diff(now, &pord->next_chunk, &tmp) >= 0) {
  77                 tmp.tv_sec = 0;
  78                 tmp.tv_usec = 1000;
  79         }
  80         if (tv_diff(&s->timeout, &tmp, NULL) > 0)
  81                 s->timeout = tmp;
  82         t->ret = 1;
  83 }
  84
  85 static void compute_next_chunk(unsigned chunk_time,
  86                 struct private_ortp_recv_data *pord)
  87 {
  88         struct timeval chunk_tv = {0, chunk_time};
  89         struct timeval tmp;
  90
  91         tv_add(&chunk_tv, &pord->next_chunk, &tmp);
  92         pord->next_chunk = tmp;
  93         pord->timestamp += pord->chunk_ts;
  94         PARA_DEBUG_LOG("next chunk (ts = %d) due at %lu:%lu\n",
  95                 pord->timestamp, pord->next_chunk.tv_sec,
  96                 pord->next_chunk.tv_usec);
  97 }
  98
  99 static void ortp_recv_post_select(__a_unused struct sched *s, struct task *t)
 100 {
 101         struct receiver_node *rn = t->private_data;
 102         struct private_ortp_recv_data *pord = rn->private_data;
 103         mblk_t *mp;
 104         int packet_type, stream_type;
 105         char tmpbuf[CHUNK_SIZE + 3];
 106         unsigned chunk_time;
 107
 108 //      PARA_INFO_LOG("rn: %p, pord: %p, session: %p\n", rn, pord, pord->session);
 109         t->ret = -E_ORTP_RECV_EOF;
 110         if (rn->output_eof && *rn->output_eof) {
 111                 rn->eof = 1;
 112                 return;
 113         }
 114         t->ret = 1;
 115         if (pord->start.tv_sec)
 116                 if (tv_diff(now, &pord->next_chunk, NULL) < 0)
 117                         return;
 118         mp = rtp_session_recvm_with_ts(pord->session, pord->timestamp);
 119         if (!mp) {
 120                 struct timeval min_delay = {0, 100};
 121 //              PARA_INFO_LOG("nope, chunk_ts = %d, loaded: %d, bad: %d\n",
 122 //                      pord->timestamp, rn->loaded, pord->c_bad);
 123                 pord->c_bad++;
 124                 t->ret = -E_TOO_MANY_BAD_CHUNKS;
 125                 if ((pord->c_bad > 5000 && pord->start.tv_sec) || pord->c_bad > 10000)
 126                         return;
 127                 t->ret = 1;
 128                 tv_add(now, &min_delay, &pord->next_chunk);
 129                 return;
 130         }
 131         /* okay, we have a chunk of data */
 132         if (!pord->start.tv_sec)
 133                 pord->start = *now;
 134         t->ret = msg_to_buf(mp, tmpbuf, CHUNK_SIZE);
 135         if (t->ret < ORTP_AUDIO_HEADER_LEN) {
 136                 rn->eof = 1;
 137                 if (t->ret < 0)
 138                         t->ret = -E_MSG_TO_BUF;
 139                 else
 140                         t->ret = -E_ORTP_RECV_EOF;
 141                 goto err_out;
 142         }
 143         packet_type = READ_PACKET_TYPE(tmpbuf);
 144         stream_type = READ_STREAM_TYPE(tmpbuf);
 145         chunk_time = READ_CHUNK_TIME(tmpbuf);
 146         pord->chunk_ts = READ_CHUNK_TS(tmpbuf);
 147 //      PARA_INFO_LOG("packet type: %d, stream type: %d, chunk time: %u,"
 148 //              " chunk_ts: %u, loaded: %u, bad: %d\n", packet_type,
 149 //              stream_type, chunk_time, pord->chunk_ts, rn->loaded, pord->c_bad);
 150         switch (packet_type) {
 151         unsigned header_len, payload_len;
 152         case ORTP_EOF:
 153                 rn->eof = 1;
 154                 t->ret = -E_ORTP_RECV_EOF;
 155                 goto err_out;
 156         case ORTP_BOF:
 157                 PARA_INFO_LOG("bof (%d)\n", t->ret);
 158                 pord->have_header = 1;
 159                 /* fall through */
 160         case ORTP_DATA:
 161                 if (!pord->have_header && stream_type)
 162                 /* can't use the data, wait for header */
 163                         goto success;
 164                 if (t->ret + rn->loaded >= CHUNK_SIZE + ORTP_AUDIO_HEADER_LEN) {
 165                         t->ret = -E_OVERRUN;
 166                         goto err_out;
 167                 }
 168                 if (t->ret > ORTP_AUDIO_HEADER_LEN) {
 169                         memcpy(rn->buf + rn->loaded, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 170                                 t->ret - ORTP_AUDIO_HEADER_LEN);
 171                         rn->loaded += t->ret - ORTP_AUDIO_HEADER_LEN;
 172                 }
 173                 goto success;
 174         case ORTP_HEADER:
 175                 header_len = READ_HEADER_LEN(tmpbuf);
 176                 PARA_DEBUG_LOG("header packet (%d bytes), header len: %d\n",
 177                         t->ret, header_len);
 178                 if (!pord->have_header) {
 179                         pord->have_header = 1;
 180                         memcpy(rn->buf, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 181                                 t->ret - ORTP_AUDIO_HEADER_LEN);
 182                         rn->loaded = t->ret - ORTP_AUDIO_HEADER_LEN;
 183                         goto success;
 184                 }
 185                 if (header_len + ORTP_AUDIO_HEADER_LEN > t->ret) {
 186                         t->ret = -E_INVALID_HEADER;
 187                         goto err_out;
 188                 }
 189                 payload_len = t->ret - ORTP_AUDIO_HEADER_LEN - header_len;
 190 //              PARA_INFO_LOG("len: %d header_len: %d, payload_len: %d, loaded: %d\n", ret,
 191 //                      header_len, payload_len, rn->loaded);
 192                 if (rn->loaded + payload_len > CHUNK_SIZE) {
 193                         t->ret = -E_OVERRUN;
 194                         goto err_out;
 195                 }
 196                 if (payload_len)
 197                         memcpy(rn->buf + rn->loaded, tmpbuf
 198                                 + (t->ret - payload_len), payload_len);
 199                 rn->loaded += payload_len;
 200                 goto success;
 201         }
 202 success:
 203         t->ret = 1;
 204         freemsg(mp);
 205         if (pord->c_bad) {
 206                 pord->c_bad = 0;
 207                 pord->next_chunk = *now;
 208         }
 209         compute_next_chunk(chunk_time, pord);
 210         return;
 211 err_out:
 212         rn->eof = 1;
 213         freemsg(mp);
 214 }
 215
 216 static void ortp_shutdown(void)
 217 {
 218 //      ortp_global_stats_display();
 219         ortp_exit();
 220 }
 221
 222 static void ortp_recv_close(struct receiver_node *rn)
 223 {
 224         struct private_ortp_recv_data *pord = rn->private_data;
 225
 226         rtp_session_destroy(pord->session);
 227         free(rn->private_data);
 228         free(rn->buf);
 229 }
 230
 231 static void *ortp_recv_parse_config(int argc, char **argv)
 232 {
 233         int ret;
 234
 235         struct ortp_recv_args_info *tmp = para_calloc(sizeof(struct ortp_recv_args_info));
 236
 237         ret = ortp_recv_cmdline_parser(argc, argv, tmp)? -E_ORTP_SYNTAX : 1;
 238         if (ret > 0)
 239                 return tmp;
 240         free(tmp);
 241         return NULL;
 242 }
 243
 244 static int ortp_recv_open(struct receiver_node *rn)
 245 {
 246         struct private_ortp_recv_data *pord;
 247         struct ortp_recv_args_info *conf = rn->conf;
 248
 249         rn->buf = para_calloc(CHUNK_SIZE);
 250
 251         rn->private_data = para_calloc(sizeof(struct private_ortp_recv_data));
 252         pord = rn->private_data;
 253         pord->session = rtp_session_new(RTP_SESSION_RECVONLY);
 254         PARA_NOTICE_LOG("receiving from %s:%d\n", conf->host_arg, conf->port_arg);
 255         rtp_session_set_local_addr(pord->session, conf->host_arg, conf->port_arg);
 256         rtp_session_set_payload_type(pord->session, PAYLOAD_AUDIO_CONTINUOUS);
 257         if (conf->jitter_compensation_arg) {
 258                 rtp_session_enable_adaptive_jitter_compensation(pord->session, TRUE);
 259                 rtp_session_set_jitter_compensation(pord->session,
 260                         conf->jitter_compensation_arg);
 261         }
 262         return 1;
 263 }
 264
 265 /**
 266  * the init function of the ortp receiver
 267  *
 268  * \param r pointer to the receiver struct to initialize
 269  *
 270  * Initialize all function pointers of \a r and call libortp's ortp_init().
 271  */
 272 void ortp_recv_init(struct receiver *r)
 273 {
 274         r->shutdown = ortp_shutdown;
 275         r->open = ortp_recv_open;
 276         r->close = ortp_recv_close;
 277         r->pre_select = ortp_recv_pre_select;
 278         r->post_select = ortp_recv_post_select;
 279         r->parse_config = ortp_recv_parse_config;
 280
 281         ortp_init();
 282 }