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 "recv.h"
  25 #include "ortp_recv.cmdline.h"
  26
  27 #include "error.h"
  28 #include "audiod.h"
  29 #include "string.h"
  30
  31 #define CHUNK_SIZE 128 * 1024
  32
  33 extern int msg_to_buf(mblk_t *, char *, int);
  34
  35 /**
  36  * data specific to the ortp receiver
  37  *
  38  * \sa receiver receiver_node
  39  */
  40 struct private_ortp_recv_data {
  41
  42 /**
  43  *
  44  *
  45  * whether a header was received
  46  *
  47  * A flag indicating whether the ortp receiver already received a packet which
  48  * contains the audio file header.
  49  *
  50  * This flag has no effect if the audio stream indicates that no extra headers
  51  * will be sent (mp3).  Otherwise, all data packets are dropped until the
  52  * header is received.
  53  */
  54 int have_header;
  55 /** the ortp session this instance of the receiver belongs to */
  56 RtpSession *session;
  57 /** the time the first data or header packet was received */
  58 struct timeval start;
  59 /** ETA of the next chunk */
  60 struct timeval next_chunk;
  61 /** number of consecutive bad chunks */
  62 int c_bad;
  63 /** the current timestamp which is passed to the receiving function of libortp */
  64 uint32_t timestamp;
  65 /** \a timestamp increases by this amount */
  66 uint32_t chunk_ts;
  67 };
  68
  69 static int ortp_recv_pre_select(struct receiver_node *rn,
  70                 __a_unused fd_set *rfds, __a_unused fd_set *wfds,
  71                 struct timeval *timeout)
  72 {
  73         struct private_ortp_recv_data *pord = rn->private_data;
  74         struct timeval now, tmp;
  75
  76         gettimeofday(&now, NULL);
  77         if (tv_diff(&now, &pord->next_chunk, &tmp) >= 0) {
  78                 tmp.tv_sec = 0;
  79                 tmp.tv_usec = 1000;
  80         }
  81         if (tv_diff(timeout, &tmp, NULL) > 0)
  82                 *timeout = tmp;
  83         return -1; /* we did not modify the fd sets */
  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 int ortp_recv_post_select(struct receiver_node *rn,
 101                 __a_unused int select_ret, __a_unused fd_set *rfds,
 102                 __a_unused fd_set *wfds)
 103 {
 104         struct private_ortp_recv_data *pord = rn->private_data;
 105         mblk_t *mp;
 106         int ret, packet_type, stream_type;
 107         char tmpbuf[CHUNK_SIZE + 3];
 108         struct timeval now;
 109         unsigned chunk_time;
 110
 111         gettimeofday(&now, NULL);
 112 //      PARA_DEBUG_LOG("rn: %p, pord: %p, session: %p\n", rn, pord, pord->session);
 113         if (pord->start.tv_sec) {
 114                 struct timeval diff;
 115                 if (tv_diff(&now, &pord->next_chunk, &diff) < 0)
 116                                 return 1;
 117         }
 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                 if ((pord->c_bad > 5000 && pord->start.tv_sec) || pord->c_bad > 10000)
 125                         return -E_TOO_MANY_BAD_CHUNKS;
 126                 tv_add(&now, &min_delay, &pord->next_chunk);
 127                 return 1;
 128         }
 129         /* okay, we have a chunk of data */
 130         if (!pord->start.tv_sec)
 131                 pord->start = now;
 132         ret = msg_to_buf(mp, tmpbuf, CHUNK_SIZE);
 133 //      PARA_DEBUG_LOG("have it ts = %d, chunk_ts = %d, loaded: %d, "
 134 //              "bad: %d, len: %d\n", pord->timestamp, pord->chunk_ts,
 135 //              rn->loaded, pord->c_bad, ret);
 136         if (ret < ORTP_AUDIO_HEADER_LEN) {
 137                 if (ret < 0)
 138                         ret = -E_MSG_TO_BUF;
 139                 else
 140                         ret = 0;
 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                 ret = 0;
 154                 goto err_out;
 155         case ORTP_BOF:
 156                 PARA_INFO_LOG("bof (%d)\n", ret);
 157                 pord->have_header = 1;
 158                 /* fall through */
 159         case ORTP_DATA:
 160                 if (!pord->have_header && stream_type)
 161                 /* can't use the data, wait for header */
 162                         goto success;
 163                 if (ret + rn->loaded >= CHUNK_SIZE + ORTP_AUDIO_HEADER_LEN) {
 164                         ret = -E_OVERRUN;
 165                         goto err_out;
 166                 }
 167                 if (ret > ORTP_AUDIO_HEADER_LEN) {
 168                         memcpy(rn->buf + rn->loaded, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 169                                 ret - ORTP_AUDIO_HEADER_LEN);
 170                         rn->loaded += ret - ORTP_AUDIO_HEADER_LEN;
 171                 }
 172                 goto success;
 173         case ORTP_HEADER:
 174                 header_len = READ_HEADER_LEN(tmpbuf);
 175                 PARA_DEBUG_LOG("header packet (%d bytes), header len: %d\n",
 176                         ret, header_len);
 177                 if (!pord->have_header) {
 178                         pord->have_header = 1;
 179                         memcpy(rn->buf, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 180                                 ret - ORTP_AUDIO_HEADER_LEN);
 181                         rn->loaded = ret - ORTP_AUDIO_HEADER_LEN;
 182                         goto success;
 183                 }
 184                 if (header_len + ORTP_AUDIO_HEADER_LEN > ret) {
 185                         ret = -E_INVALID_HEADER;
 186                         goto err_out;
 187                 }
 188                 payload_len = ret - ORTP_AUDIO_HEADER_LEN - header_len;
 189 //              PARA_INFO_LOG("len: %d header_len: %d, payload_len: %d, loaded: %d\n", ret,
 190 //                      header_len, payload_len, rn->loaded);
 191                 if (rn->loaded + payload_len > CHUNK_SIZE) {
 192                         ret = -E_OVERRUN;
 193                         goto err_out;
 194                 }
 195                 if (payload_len)
 196                         memcpy(rn->buf + rn->loaded, tmpbuf
 197                                 + (ret - payload_len), payload_len);
 198                 rn->loaded += payload_len;
 199                 goto success;
 200         }
 201 success:
 202         freemsg(mp);
 203         if (pord->c_bad) {
 204                 pord->c_bad = 0;
 205                 pord->next_chunk = now;
 206         }
 207         compute_next_chunk(chunk_time, pord);
 208         return 1;
 209 err_out:
 210         freemsg(mp);
 211         return ret;
 212 }
 213
 214 static void ortp_shutdown(void)
 215 {
 216 //      ortp_global_stats_display();
 217         ortp_exit();
 218 }
 219
 220 static void ortp_recv_close(struct receiver_node *rn)
 221 {
 222         struct private_ortp_recv_data *pord = rn->private_data;
 223
 224         rtp_session_destroy(pord->session);
 225         free(rn->private_data);
 226         free(rn->buf);
 227 }
 228
 229 static void *ortp_recv_parse_config(int argc, char **argv)
 230 {
 231         int ret;
 232
 233         struct ortp_recv_args_info *tmp = para_calloc(sizeof(struct ortp_recv_args_info));
 234
 235         ret = ortp_recv_cmdline_parser(argc, argv, tmp)? -E_ORTP_SYNTAX : 1;
 236         if (ret > 0)
 237                 return tmp;
 238         free(tmp);
 239         return NULL;
 240 }
 241
 242 static int ortp_recv_open(struct receiver_node *rn)
 243 {
 244         struct private_ortp_recv_data *pord;
 245         struct ortp_recv_args_info *conf = rn->conf;
 246
 247         rn->buf = para_calloc(CHUNK_SIZE);
 248
 249         rn->private_data = para_calloc(sizeof(struct private_ortp_recv_data));
 250         pord = rn->private_data;
 251         pord->session = rtp_session_new(RTP_SESSION_RECVONLY);
 252         PARA_NOTICE_LOG("receiving from %s:%d\n", conf->host_arg, conf->port_arg);
 253         rtp_session_set_local_addr(pord->session, conf->host_arg, conf->port_arg);
 254         rtp_session_set_payload_type(pord->session, PAYLOAD_AUDIO_CONTINUOUS);
 255         if (conf->jitter_compensation_arg) {
 256                 rtp_session_enable_adaptive_jitter_compensation(pord->session, TRUE);
 257                 rtp_session_set_jitter_compensation(pord->session,
 258                         conf->jitter_compensation_arg);
 259         }
 260         return 1;
 261 }
 262
 263 /**
 264  * the init function of the ortp receiver
 265  *
 266  * \param r pointer to the receiver struct to initialize
 267  *
 268  * Initialize all function pointers of \a r and call libortp's ortp_init().
 269  */
 270 void ortp_recv_init(struct receiver *r)
 271 {
 272         r->shutdown = ortp_shutdown;
 273         r->open = ortp_recv_open;
 274         r->close = ortp_recv_close;
 275         r->pre_select = ortp_recv_pre_select;
 276         r->post_select = ortp_recv_post_select;
 277         r->parse_config = ortp_recv_parse_config;
 278
 279         ortp_init();
 280 }