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(struct timeval *now, 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, int select_ret,
 101         __a_unused fd_set *rfds, __a_unused fd_set *wfds)
 102 {
 103         struct private_ortp_recv_data *pord = rn->private_data;
 104         mblk_t *mp;
 105         int ret, packet_type, stream_type;
 106         char tmpbuf[CHUNK_SIZE + 3];
 107         struct timeval now;
 108         unsigned chunk_time;
 109
 110         gettimeofday(&now, NULL);
 111 //      PARA_DEBUG_LOG("rn: %p, pord: %p, session: %p\n", rn, pord, pord->session);
 112         if (pord->start.tv_sec) {
 113                 struct timeval diff;
 114                 if (tv_diff(&now, &pord->next_chunk, &diff) < 0)
 115                                 return 1;
 116         }
 117         mp = rtp_session_recvm_with_ts(pord->session, pord->timestamp);
 118         if (!mp) {
 119                 struct timeval min_delay = {0, 100};
 120 //              PARA_INFO_LOG("nope, chunk_ts = %d, loaded: %d, bad: %d\n",
 121 //                      pord->timestamp, rn->loaded, pord->c_bad);
 122                 pord->c_bad++;
 123                 if ((pord->c_bad > 5000 && pord->start.tv_sec) || pord->c_bad > 10000)
 124                         return -E_TOO_MANY_BAD_CHUNKS;
 125                 tv_add(&now, &min_delay, &pord->next_chunk);
 126                 return 1;
 127         }
 128         /* okay, we have a chunk of data */
 129         if (!pord->start.tv_sec)
 130                 pord->start = now;
 131         ret = msg_to_buf(mp, tmpbuf, CHUNK_SIZE);
 132 //      PARA_DEBUG_LOG("have it ts = %d, chunk_ts = %d, loaded: %d, "
 133 //              "bad: %d, len: %d\n", pord->timestamp, pord->chunk_ts,
 134 //              rn->loaded, pord->c_bad, ret);
 135         if (ret < ORTP_AUDIO_HEADER_LEN) {
 136                 if (ret < 0)
 137                         ret = -E_MSG_TO_BUF;
 138                 else
 139                         ret = 0;
 140                 goto err_out;
 141         }
 142         packet_type = READ_PACKET_TYPE(tmpbuf);
 143         stream_type = READ_STREAM_TYPE(tmpbuf);
 144         chunk_time = READ_CHUNK_TIME(tmpbuf);
 145         pord->chunk_ts = READ_CHUNK_TS(tmpbuf);
 146 //      PARA_INFO_LOG("packet type: %d, stream type: %d, chunk time: %u,"
 147 //              " chunk_ts: %u, loaded: %u, bad: %d\n", packet_type,
 148 //              stream_type, chunk_time, pord->chunk_ts, rn->loaded, pord->c_bad);
 149         switch (packet_type) {
 150         unsigned header_len, payload_len;
 151         case ORTP_EOF:
 152                 ret = 0;
 153                 goto err_out;
 154         case ORTP_BOF:
 155                 PARA_INFO_LOG("bof (%d)\n", ret);
 156                 pord->have_header = 1;
 157                 /* fall through */
 158         case ORTP_DATA:
 159                 if (!pord->have_header && stream_type)
 160                 /* can't use the data, wait for header */
 161                         goto success;
 162                 if (ret + rn->loaded >= CHUNK_SIZE + ORTP_AUDIO_HEADER_LEN) {
 163                         ret = -E_OVERRUN;
 164                         goto err_out;
 165                 }
 166                 if (ret > ORTP_AUDIO_HEADER_LEN) {
 167                         memcpy(rn->buf + rn->loaded, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 168                                 ret - ORTP_AUDIO_HEADER_LEN);
 169                         rn->loaded += ret - ORTP_AUDIO_HEADER_LEN;
 170                 }
 171                 goto success;
 172         case ORTP_HEADER:
 173                 header_len = READ_HEADER_LEN(tmpbuf);
 174                 PARA_DEBUG_LOG("header packet (%d bytes), header len: %d\n",
 175                         ret, header_len);
 176                 if (!pord->have_header) {
 177                         pord->have_header = 1;
 178                         memcpy(rn->buf, tmpbuf + ORTP_AUDIO_HEADER_LEN,
 179                                 ret - ORTP_AUDIO_HEADER_LEN);
 180                         rn->loaded = ret - ORTP_AUDIO_HEADER_LEN;
 181                         goto success;
 182                 }
 183                 if (header_len + ORTP_AUDIO_HEADER_LEN > ret) {
 184                         ret = -E_INVALID_HEADER;
 185                         goto err_out;
 186                 }
 187                 payload_len = ret - ORTP_AUDIO_HEADER_LEN - header_len;
 188 //              PARA_INFO_LOG("len: %d header_len: %d, payload_len: %d, loaded: %d\n", ret,
 189 //                      header_len, payload_len, rn->loaded);
 190                 if (rn->loaded + payload_len > CHUNK_SIZE) {
 191                         ret = -E_OVERRUN;
 192                         goto err_out;
 193                 }
 194                 if (payload_len)
 195                         memcpy(rn->buf + rn->loaded, tmpbuf
 196                                 + (ret - payload_len), payload_len);
 197                 rn->loaded += payload_len;
 198                 goto success;
 199         }
 200 success:
 201         freemsg(mp);
 202         if (pord->c_bad) {
 203                 pord->c_bad = 0;
 204                 pord->next_chunk = now;
 205         }
 206         compute_next_chunk(&now, chunk_time, pord);
 207         return 1;
 208 err_out:
 209         freemsg(mp);
 210         return ret;
 211 }
 212
 213 static void ortp_shutdown(void)
 214 {
 215 //      ortp_global_stats_display();
 216         ortp_exit();
 217 }
 218
 219 static void ortp_recv_close(struct receiver_node *rn)
 220 {
 221         struct private_ortp_recv_data *pord = rn->private_data;
 222
 223         rtp_session_destroy(pord->session);
 224         free(rn->private_data);
 225         free(rn->buf);
 226 }
 227
 228 static void *ortp_recv_parse_config(int argc, char **argv)
 229 {
 230         int ret;
 231
 232         struct ortp_recv_args_info *tmp = para_calloc(sizeof(struct ortp_recv_args_info));
 233
 234         ret = ortp_recv_cmdline_parser(argc, argv, tmp)? -E_ORTP_SYNTAX : 1;
 235         if (ret > 0)
 236                 return tmp;
 237         free(tmp);
 238         return NULL;
 239 }
 240
 241 static int ortp_recv_open(struct receiver_node *rn)
 242 {
 243         struct private_ortp_recv_data *pord;
 244         struct ortp_recv_args_info *conf = rn->conf;
 245
 246         rn->buf = para_calloc(CHUNK_SIZE);
 247
 248         rn->private_data = para_calloc(sizeof(struct private_ortp_recv_data));
 249         pord = rn->private_data;
 250         pord->session = rtp_session_new(RTP_SESSION_RECVONLY);
 251         PARA_NOTICE_LOG("receiving from %s:%d\n", conf->host_arg, conf->port_arg);
 252         rtp_session_set_local_addr(pord->session, conf->host_arg, conf->port_arg);
 253         rtp_session_set_payload_type(pord->session, PAYLOAD_AUDIO_CONTINUOUS);
 254         if (conf->jitter_compensation_arg) {
 255                 rtp_session_enable_adaptive_jitter_compensation(pord->session, TRUE);
 256                 rtp_session_set_jitter_compensation(pord->session,
 257                         conf->jitter_compensation_arg);
 258         }
 259         return 1;
 260 }
 261
 262 /**
 263  * the init function of the ortp receiver
 264  *
 265  * \param r pointer to the receiver struct to initialize
 266  *
 267  * Initialize all function pointers of \a r and call libortp's ortp_init().
 268  */
 269 void ortp_recv_init(struct receiver *r)
 270 {
 271         r->shutdown = ortp_shutdown;
 272         r->open = ortp_recv_open;
 273         r->close = ortp_recv_close;
 274         r->pre_select = ortp_recv_pre_select;
 275         r->post_select = ortp_recv_post_select;
 276         r->parse_config = ortp_recv_parse_config;
 277
 278         ortp_init();
 279 }