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*) pa_memblock_acquire(chunk.memblock) + 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_release(mb[i]);
 119                     pa_memblock_unref(mb[i]);
 120                 }
 121
 122                 c->sequence++;
 123             } else
 124                 k = 0;
 125
 126             c->timestamp += skip/c->frame_size;
 127
 128             if (k < 0) {
 129                 if (errno != EAGAIN) /* If the queue is full, just ignore it */
 130                     pa_log("sendmsg() failed: %s", pa_cstrerror(errno));
 131                 return -1;
 132             }
 133
 134             if (r < 0 || pa_memblockq_get_length(q) < size)
 135                 break;
 136
 137             n = 0;
 138             skip = 0;
 139             iov_idx = 1;
 140         }
 141     }
 142
 143     return 0;
 144 }
 145
 146 pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd, size_t frame_size) {
 147     assert(c);
 148
 149     c->fd = fd;
 150     c->frame_size = frame_size;
 151     return c;
 152 }
 153
 154 int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) {
 155     int size;
 156     struct msghdr m;
 157     struct iovec iov;
 158     uint32_t header;
 159     int cc;
 160     ssize_t r;
 161
 162     assert(c);
 163     assert(chunk);
 164
 165     chunk->memblock = NULL;
 166
 167     if (ioctl(c->fd, FIONREAD, &size) < 0) {
 168         pa_log("FIONREAD failed: %s", pa_cstrerror(errno));
 169         goto fail;
 170     }
 171
 172     if (!size)
 173         return 0;
 174
 175     chunk->memblock = pa_memblock_new(pool, size);
 176
 177     iov.iov_base = pa_memblock_acquire(chunk->memblock);
 178     iov.iov_len = size;
 179
 180     m.msg_name = NULL;
 181     m.msg_namelen = 0;
 182     m.msg_iov = &iov;
 183     m.msg_iovlen = 1;
 184     m.msg_control = NULL;
 185     m.msg_controllen = 0;
 186     m.msg_flags = 0;
 187
 188     if ((r = recvmsg(c->fd, &m, 0)) != size) {
 189         pa_log("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
 190         goto fail;
 191     }
 192
 193     if (size < 12) {
 194         pa_log("RTP packet too short.");
 195         goto fail;
 196     }
 197
 198     memcpy(&header, iov.iov_base, sizeof(uint32_t));
 199     memcpy(&c->timestamp, (uint8_t*) iov.iov_base + 4, sizeof(uint32_t));
 200     memcpy(&c->ssrc, (uint8_t*) iov.iov_base + 8, sizeof(uint32_t));
 201
 202     header = ntohl(header);
 203     c->timestamp = ntohl(c->timestamp);
 204     c->ssrc = ntohl(c->ssrc);
 205
 206     if ((header >> 30) != 2) {
 207         pa_log("Unsupported RTP version.");
 208         goto fail;
 209     }
 210
 211     if ((header >> 29) & 1) {
 212         pa_log("RTP padding not supported.");
 213         goto fail;
 214     }
 215
 216     if ((header >> 28) & 1) {
 217         pa_log("RTP header extensions not supported.");
 218         goto fail;
 219     }
 220
 221     cc = (header >> 24) & 0xF;
 222     c->payload = (header >> 16) & 127;
 223     c->sequence = header & 0xFFFF;
 224
 225     if (12 + cc*4 > size) {
 226         pa_log("RTP packet too short. (CSRC)");
 227         goto fail;
 228     }
 229
 230     chunk->index = 12 + cc*4;
 231     chunk->length = size - chunk->index;
 232
 233     if (chunk->length % c->frame_size != 0) {
 234         pa_log("Vad RTP packet size.");
 235         goto fail;
 236     }
 237
 238     return 0;
 239
 240 fail:
 241     if (chunk->memblock) {
 242         pa_memblock_release(chunk->memblock);
 243         pa_memblock_unref(chunk->memblock);
 244     }
 245
 246     return -1;
 247 }
 248
 249 uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
 250     assert(ss);
 251
 252     if (ss->format == PA_SAMPLE_ULAW && ss->rate == 8000 && ss->channels == 1)
 253         return 0;
 254     if (ss->format == PA_SAMPLE_ALAW && ss->rate == 8000 && ss->channels == 1)
 255         return 8;
 256     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
 257         return 10;
 258     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
 259         return 11;
 260
 261     return 127;
 262 }
 263
 264 pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
 265     assert(ss);
 266
 267     switch (payload) {
 268         case 0:
 269             ss->channels = 1;
 270             ss->format = PA_SAMPLE_ULAW;
 271             ss->rate = 8000;
 272             break;
 273
 274         case 8:
 275             ss->channels = 1;
 276             ss->format = PA_SAMPLE_ALAW;
 277             ss->rate = 8000;
 278             break;
 279
 280         case 10:
 281             ss->channels = 2;
 282             ss->format = PA_SAMPLE_S16BE;
 283             ss->rate = 44100;
 284             break;
 285
 286         case 11:
 287             ss->channels = 1;
 288             ss->format = PA_SAMPLE_S16BE;
 289             ss->rate = 44100;
 290             break;
 291
 292         default:
 293             return NULL;
 294     }
 295
 296     return ss;
 297 }
 298
 299 pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss) {
 300     assert(ss);
 301
 302     if (!pa_rtp_sample_spec_valid(ss))
 303         ss->format = PA_SAMPLE_S16BE;
 304
 305     assert(pa_rtp_sample_spec_valid(ss));
 306     return ss;
 307 }
 308
 309 int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
 310     assert(ss);
 311
 312     if (!pa_sample_spec_valid(ss))
 313         return 0;
 314
 315     return
 316         ss->format == PA_SAMPLE_U8 ||
 317         ss->format == PA_SAMPLE_ALAW ||
 318         ss->format == PA_SAMPLE_ULAW ||
 319         ss->format == PA_SAMPLE_S16BE;
 320 }
 321
 322 void pa_rtp_context_destroy(pa_rtp_context *c) {
 323     assert(c);
 324
 325     close(c->fd);
 326 }
 327
 328 const char* pa_rtp_format_to_string(pa_sample_format_t f) {
 329     switch (f) {
 330         case PA_SAMPLE_S16BE:
 331             return "L16";
 332         case PA_SAMPLE_U8:
 333             return "L8";
 334         case PA_SAMPLE_ALAW:
 335             return "PCMA";
 336         case PA_SAMPLE_ULAW:
 337             return "PCMU";
 338         default:
 339             return NULL;
 340     }
 341 }
 342
 343 pa_sample_format_t pa_rtp_string_to_format(const char *s) {
 344     assert(s);
 345
 346     if (!(strcmp(s, "L16")))
 347         return PA_SAMPLE_S16BE;
 348     else if (!strcmp(s, "L8"))
 349         return PA_SAMPLE_U8;
 350     else if (!strcmp(s, "PCMA"))
 351         return PA_SAMPLE_ALAW;
 352     else if (!strcmp(s, "PCMU"))
 353         return PA_SAMPLE_ULAW;
 354     else
 355         return PA_SAMPLE_INVALID;
 356 }
 357