code.delx.au - pulseaudio/blob - src/modules/rtp/rtp.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <fcntl.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <errno.h>
  31 #include <arpa/inet.h>
  32 #include <unistd.h>
  33 #include <sys/ioctl.h>
  34
  35 #ifdef HAVE_SYS_FILIO_H
  36 #include <sys/filio.h>
  37 #endif
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/log.h>
  41
  42 #include "rtp.h"
  43
  44 pa_rtp_context* pa_rtp_context_init_send(pa_rtp_context *c, int fd, uint32_t ssrc, uint8_t payload, size_t frame_size) {
  45     assert(c);
  46     assert(fd >= 0);
  47
  48     c->fd = fd;
  49     c->sequence = (uint16_t) (rand()*rand());
  50     c->timestamp = 0;
  51     c->ssrc = ssrc ? ssrc : (uint32_t) (rand()*rand());
  52     c->payload = payload & 127;
  53     c->frame_size = frame_size;
  54
  55     return c;
  56 }
  57
  58 #define MAX_IOVECS 16
  59
  60 int pa_rtp_send(pa_rtp_context *c, size_t size, pa_memblockq *q) {
  61     struct iovec iov[MAX_IOVECS];
  62     pa_memblock* mb[MAX_IOVECS];
  63     int iov_idx = 1;
  64     size_t n = 0, skip = 0;
  65
  66     assert(c);
  67     assert(size > 0);
  68     assert(q);
  69
  70     if (pa_memblockq_get_length(q) < size)
  71         return 0;
  72
  73     for (;;) {
  74         int r;
  75         pa_memchunk chunk;
  76
  77         if ((r = pa_memblockq_peek(q, &chunk)) >= 0) {
  78
  79             size_t k = n + chunk.length > size ? size - n : chunk.length;
  80
  81             if (chunk.memblock) {
  82                 iov[iov_idx].iov_base = (void*)((uint8_t*) chunk.memblock->data + chunk.index);
  83                 iov[iov_idx].iov_len = k;
  84                 mb[iov_idx] = chunk.memblock;
  85                 iov_idx ++;
  86
  87                 n += k;
  88             }
  89
  90             skip += k;
  91             pa_memblockq_drop(q, &chunk, k);
  92         }
  93
  94         if (r < 0 || !chunk.memblock || n >= size || iov_idx >= MAX_IOVECS) {
  95             uint32_t header[3];
  96             struct msghdr m;
  97             int k, i;
  98
  99             if (n > 0) {
 100                 header[0] = htonl(((uint32_t) 2 << 30) | ((uint32_t) c->payload << 16) | ((uint32_t) c->sequence));
 101                 header[1] = htonl(c->timestamp);
 102                 header[2] = htonl(c->ssrc);
 103
 104                 iov[0].iov_base = (void*)header;
 105                 iov[0].iov_len = sizeof(header);
 106
 107                 m.msg_name = NULL;
 108                 m.msg_namelen = 0;
 109                 m.msg_iov = iov;
 110                 m.msg_iovlen = iov_idx;
 111                 m.msg_control = NULL;
 112                 m.msg_controllen = 0;
 113                 m.msg_flags = 0;
 114
 115                 k = sendmsg(c->fd, &m, MSG_DONTWAIT);
 116
 117                 for (i = 1; i < iov_idx; i++)
 118                     pa_memblock_unref(mb[i]);
 119
 120                 c->sequence++;
 121             } else
 122                 k = 0;
 123
 124             c->timestamp += skip/c->frame_size;
 125
 126             if (k < 0) {
 127                 if (errno != EAGAIN) /* If the queue is full, just ignore it */
 128                     pa_log(__FILE__": sendmsg() failed: %s", pa_cstrerror(errno));
 129                 return -1;
 130             }
 131
 132             if (r < 0 || pa_memblockq_get_length(q) < size)
 133                 break;
 134
 135             n = 0;
 136             skip = 0;
 137             iov_idx = 1;
 138         }
 139     }
 140
 141     return 0;
 142 }
 143
 144 pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd, size_t frame_size) {
 145     assert(c);
 146
 147     c->fd = fd;
 148     c->frame_size = frame_size;
 149     return c;
 150 }
 151
 152 int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_memblock_stat *st) {
 153     int size;
 154     struct msghdr m;
 155     struct iovec iov;
 156     uint32_t header;
 157     int cc;
 158     ssize_t r;
 159
 160     assert(c);
 161     assert(chunk);
 162
 163     chunk->memblock = NULL;
 164
 165     if (ioctl(c->fd, FIONREAD, &size) < 0) {
 166         pa_log(__FILE__": FIONREAD failed: %s", pa_cstrerror(errno));
 167         goto fail;
 168     }
 169
 170     if (!size)
 171         return 0;
 172
 173     chunk->memblock = pa_memblock_new(size, st);
 174
 175     iov.iov_base = chunk->memblock->data;
 176     iov.iov_len = size;
 177
 178     m.msg_name = NULL;
 179     m.msg_namelen = 0;
 180     m.msg_iov = &iov;
 181     m.msg_iovlen = 1;
 182     m.msg_control = NULL;
 183     m.msg_controllen = 0;
 184     m.msg_flags = 0;
 185
 186     if ((r = recvmsg(c->fd, &m, 0)) != size) {
 187         pa_log(__FILE__": recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
 188         goto fail;
 189     }
 190
 191     if (size < 12) {
 192         pa_log(__FILE__": RTP packet too short.");
 193         goto fail;
 194     }
 195
 196     memcpy(&header, chunk->memblock->data, sizeof(uint32_t));
 197     memcpy(&c->timestamp, (uint8_t*) chunk->memblock->data + 4, sizeof(uint32_t));
 198     memcpy(&c->ssrc, (uint8_t*) chunk->memblock->data + 8, sizeof(uint32_t));
 199
 200     header = ntohl(header);
 201     c->timestamp = ntohl(c->timestamp);
 202     c->ssrc = ntohl(c->ssrc);
 203
 204     if ((header >> 30) != 2) {
 205         pa_log(__FILE__": Unsupported RTP version.");
 206         goto fail;
 207     }
 208
 209     if ((header >> 29) & 1) {
 210         pa_log(__FILE__": RTP padding not supported.");
 211         goto fail;
 212     }
 213
 214     if ((header >> 28) & 1) {
 215         pa_log(__FILE__": RTP header extensions not supported.");
 216         goto fail;
 217     }
 218
 219     cc = (header >> 24) & 0xF;
 220     c->payload = (header >> 16) & 127;
 221     c->sequence = header & 0xFFFF;
 222
 223     if (12 + cc*4 > size) {
 224         pa_log(__FILE__": RTP packet too short. (CSRC)");
 225         goto fail;
 226     }
 227
 228     chunk->index = 12 + cc*4;
 229     chunk->length = size - chunk->index;
 230
 231     if (chunk->length % c->frame_size != 0) {
 232         pa_log(__FILE__": Vad RTP packet size.");
 233         goto fail;
 234     }
 235
 236     return 0;
 237
 238 fail:
 239     if (chunk->memblock)
 240         pa_memblock_unref(chunk->memblock);
 241
 242     return -1;
 243 }
 244
 245 uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
 246     assert(ss);
 247
 248     if (ss->format == PA_SAMPLE_ULAW && ss->rate == 8000 && ss->channels == 1)
 249         return 0;
 250     if (ss->format == PA_SAMPLE_ALAW && ss->rate == 8000 && ss->channels == 1)
 251         return 8;
 252     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
 253         return 10;
 254     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
 255         return 11;
 256
 257     return 127;
 258 }
 259
 260 pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
 261     assert(ss);
 262
 263     switch (payload) {
 264         case 0:
 265             ss->channels = 1;
 266             ss->format = PA_SAMPLE_ULAW;
 267             ss->rate = 8000;
 268             break;
 269
 270         case 8:
 271             ss->channels = 1;
 272             ss->format = PA_SAMPLE_ALAW;
 273             ss->rate = 8000;
 274             break;
 275
 276         case 10:
 277             ss->channels = 2;
 278             ss->format = PA_SAMPLE_S16BE;
 279             ss->rate = 44100;
 280             break;
 281
 282         case 11:
 283             ss->channels = 1;
 284             ss->format = PA_SAMPLE_S16BE;
 285             ss->rate = 44100;
 286             break;
 287
 288         default:
 289             return NULL;
 290     }
 291
 292     return ss;
 293 }
 294
 295 pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss) {
 296     assert(ss);
 297
 298     if (!pa_rtp_sample_spec_valid(ss))
 299         ss->format = PA_SAMPLE_S16BE;
 300
 301     assert(pa_rtp_sample_spec_valid(ss));
 302     return ss;
 303 }
 304
 305 int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
 306     assert(ss);
 307
 308     if (!pa_sample_spec_valid(ss))
 309         return 0;
 310
 311     return
 312         ss->format == PA_SAMPLE_U8 ||
 313         ss->format == PA_SAMPLE_ALAW ||
 314         ss->format == PA_SAMPLE_ULAW ||
 315         ss->format == PA_SAMPLE_S16BE;
 316 }
 317
 318 void pa_rtp_context_destroy(pa_rtp_context *c) {
 319     assert(c);
 320
 321     close(c->fd);
 322 }
 323
 324 const char* pa_rtp_format_to_string(pa_sample_format_t f) {
 325     switch (f) {
 326         case PA_SAMPLE_S16BE:
 327             return "L16";
 328         case PA_SAMPLE_U8:
 329             return "L8";
 330         case PA_SAMPLE_ALAW:
 331             return "PCMA";
 332         case PA_SAMPLE_ULAW:
 333             return "PCMU";
 334         default:
 335             return NULL;
 336     }
 337 }
 338
 339 pa_sample_format_t pa_rtp_string_to_format(const char *s) {
 340     assert(s);
 341
 342     if (!(strcmp(s, "L16")))
 343         return PA_SAMPLE_S16BE;
 344     else if (!strcmp(s, "L8"))
 345         return PA_SAMPLE_U8;
 346     else if (!strcmp(s, "PCMA"))
 347         return PA_SAMPLE_ALAW;
 348     else if (!strcmp(s, "PCMU"))
 349         return PA_SAMPLE_ULAW;
 350     else
 351         return PA_SAMPLE_INVALID;
 352 }
 353