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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Lennart Poettering
   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 <fcntl.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <arpa/inet.h>
  31 #include <unistd.h>
  32 #include <sys/ioctl.h>
  33
  34 #ifdef HAVE_SYS_FILIO_H
  35 #include <sys/filio.h>
  36 #endif
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/macro.h>
  41 #include <pulsecore/core-util.h>
  42
  43 #include "rtp.h"
  44
  45 pa_rtp_context* pa_rtp_context_init_send(pa_rtp_context *c, int fd, uint32_t ssrc, uint8_t payload, size_t frame_size) {
  46     pa_assert(c);
  47     pa_assert(fd >= 0);
  48
  49     c->fd = fd;
  50     c->sequence = (uint16_t) (rand()*rand());
  51     c->timestamp = 0;
  52     c->ssrc = ssrc ? ssrc : (uint32_t) (rand()*rand());
  53     c->payload = payload & 127;
  54     c->frame_size = frame_size;
  55
  56     pa_memchunk_reset(&c->memchunk);
  57
  58     return c;
  59 }
  60
  61 #define MAX_IOVECS 16
  62
  63 int pa_rtp_send(pa_rtp_context *c, size_t size, pa_memblockq *q) {
  64     struct iovec iov[MAX_IOVECS];
  65     pa_memblock* mb[MAX_IOVECS];
  66     int iov_idx = 1;
  67     size_t n = 0;
  68
  69     pa_assert(c);
  70     pa_assert(size > 0);
  71     pa_assert(q);
  72
  73     if (pa_memblockq_get_length(q) < size)
  74         return 0;
  75
  76     for (;;) {
  77         int r;
  78         pa_memchunk chunk;
  79
  80         pa_memchunk_reset(&chunk);
  81
  82         if ((r = pa_memblockq_peek(q, &chunk)) >= 0) {
  83
  84             size_t k = n + chunk.length > size ? size - n : chunk.length;
  85
  86             pa_assert(chunk.memblock);
  87
  88             iov[iov_idx].iov_base = ((uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index);
  89             iov[iov_idx].iov_len = k;
  90             mb[iov_idx] = chunk.memblock;
  91             iov_idx ++;
  92
  93             n += k;
  94             pa_memblockq_drop(q, k);
  95         }
  96
  97         pa_assert(n % c->frame_size == 0);
  98
  99         if (r < 0 || n >= size || iov_idx >= MAX_IOVECS) {
 100             uint32_t header[3];
 101             struct msghdr m;
 102             int k, i;
 103
 104             if (n > 0) {
 105                 header[0] = htonl(((uint32_t) 2 << 30) | ((uint32_t) c->payload << 16) | ((uint32_t) c->sequence));
 106                 header[1] = htonl(c->timestamp);
 107                 header[2] = htonl(c->ssrc);
 108
 109                 iov[0].iov_base = (void*)header;
 110                 iov[0].iov_len = sizeof(header);
 111
 112                 m.msg_name = NULL;
 113                 m.msg_namelen = 0;
 114                 m.msg_iov = iov;
 115                 m.msg_iovlen = iov_idx;
 116                 m.msg_control = NULL;
 117                 m.msg_controllen = 0;
 118                 m.msg_flags = 0;
 119
 120                 k = sendmsg(c->fd, &m, MSG_DONTWAIT);
 121
 122                 for (i = 1; i < iov_idx; i++) {
 123                     pa_memblock_release(mb[i]);
 124                     pa_memblock_unref(mb[i]);
 125                 }
 126
 127                 c->sequence++;
 128             } else
 129                 k = 0;
 130
 131             c->timestamp += n/c->frame_size;
 132
 133             if (k < 0) {
 134                 if (errno != EAGAIN && errno != EINTR) /* If the queue is full, just ignore it */
 135                     pa_log("sendmsg() failed: %s", pa_cstrerror(errno));
 136                 return -1;
 137             }
 138
 139             if (r < 0 || pa_memblockq_get_length(q) < size)
 140                 break;
 141
 142             n = 0;
 143             iov_idx = 1;
 144         }
 145     }
 146
 147     return 0;
 148 }
 149
 150 pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd, size_t frame_size) {
 151     pa_assert(c);
 152
 153     c->fd = fd;
 154     c->frame_size = frame_size;
 155
 156     pa_memchunk_reset(&c->memchunk);
 157     return c;
 158 }
 159
 160 int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) {
 161     int size;
 162     struct msghdr m;
 163     struct iovec iov;
 164     uint32_t header;
 165     int cc;
 166     ssize_t r;
 167
 168     pa_assert(c);
 169     pa_assert(chunk);
 170
 171     pa_memchunk_reset(chunk);
 172
 173     if (ioctl(c->fd, FIONREAD, &size) < 0) {
 174         pa_log_warn("FIONREAD failed: %s", pa_cstrerror(errno));
 175         goto fail;
 176     }
 177
 178     if (size <= 0)
 179         return 0;
 180
 181     if (c->memchunk.length < (unsigned) size) {
 182         size_t l;
 183
 184         if (c->memchunk.memblock)
 185             pa_memblock_unref(c->memchunk.memblock);
 186
 187         l = PA_MAX((size_t) size, pa_mempool_block_size_max(pool));
 188
 189         c->memchunk.memblock = pa_memblock_new(pool, l);
 190         c->memchunk.index = 0;
 191         c->memchunk.length = pa_memblock_get_length(c->memchunk.memblock);
 192     }
 193
 194     pa_assert(c->memchunk.length >= (size_t) size);
 195
 196     chunk->memblock = pa_memblock_ref(c->memchunk.memblock);
 197     chunk->index = c->memchunk.index;
 198
 199     iov.iov_base = (uint8_t*) pa_memblock_acquire(chunk->memblock) + chunk->index;
 200     iov.iov_len = size;
 201
 202     m.msg_name = NULL;
 203     m.msg_namelen = 0;
 204     m.msg_iov = &iov;
 205     m.msg_iovlen = 1;
 206     m.msg_control = NULL;
 207     m.msg_controllen = 0;
 208     m.msg_flags = 0;
 209
 210     r = recvmsg(c->fd, &m, 0);
 211     pa_memblock_release(chunk->memblock);
 212
 213     if (r != size) {
 214         if (r < 0 && errno != EAGAIN && errno != EINTR)
 215             pa_log_warn("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
 216
 217         goto fail;
 218     }
 219
 220     if (size < 12) {
 221         pa_log_warn("RTP packet too short.");
 222         goto fail;
 223     }
 224
 225     memcpy(&header, iov.iov_base, sizeof(uint32_t));
 226     memcpy(&c->timestamp, (uint8_t*) iov.iov_base + 4, sizeof(uint32_t));
 227     memcpy(&c->ssrc, (uint8_t*) iov.iov_base + 8, sizeof(uint32_t));
 228
 229     header = ntohl(header);
 230     c->timestamp = ntohl(c->timestamp);
 231     c->ssrc = ntohl(c->ssrc);
 232
 233     if ((header >> 30) != 2) {
 234         pa_log_warn("Unsupported RTP version.");
 235         goto fail;
 236     }
 237
 238     if ((header >> 29) & 1) {
 239         pa_log_warn("RTP padding not supported.");
 240         goto fail;
 241     }
 242
 243     if ((header >> 28) & 1) {
 244         pa_log_warn("RTP header extensions not supported.");
 245         goto fail;
 246     }
 247
 248     cc = (header >> 24) & 0xF;
 249     c->payload = (header >> 16) & 127;
 250     c->sequence = header & 0xFFFF;
 251
 252     if (12 + cc*4 > size) {
 253         pa_log_warn("RTP packet too short. (CSRC)");
 254         goto fail;
 255     }
 256
 257     chunk->index += 12 + cc*4;
 258     chunk->length = size - 12 + cc*4;
 259
 260     if (chunk->length % c->frame_size != 0) {
 261         pa_log_warn("Bad RTP packet size.");
 262         goto fail;
 263     }
 264
 265     c->memchunk.index = chunk->index + chunk->length;
 266     c->memchunk.length = pa_memblock_get_length(c->memchunk.memblock) - c->memchunk.index;
 267
 268     if (c->memchunk.length <= 0) {
 269         pa_memblock_unref(c->memchunk.memblock);
 270         pa_memchunk_reset(&c->memchunk);
 271     }
 272
 273     return 0;
 274
 275 fail:
 276     if (chunk->memblock)
 277         pa_memblock_unref(chunk->memblock);
 278
 279     return -1;
 280 }
 281
 282 uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
 283     pa_assert(ss);
 284
 285     if (ss->format == PA_SAMPLE_ULAW && ss->rate == 8000 && ss->channels == 1)
 286         return 0;
 287     if (ss->format == PA_SAMPLE_ALAW && ss->rate == 8000 && ss->channels == 1)
 288         return 8;
 289     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
 290         return 10;
 291     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
 292         return 11;
 293
 294     return 127;
 295 }
 296
 297 pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
 298     pa_assert(ss);
 299
 300     switch (payload) {
 301         case 0:
 302             ss->channels = 1;
 303             ss->format = PA_SAMPLE_ULAW;
 304             ss->rate = 8000;
 305             break;
 306
 307         case 8:
 308             ss->channels = 1;
 309             ss->format = PA_SAMPLE_ALAW;
 310             ss->rate = 8000;
 311             break;
 312
 313         case 10:
 314             ss->channels = 2;
 315             ss->format = PA_SAMPLE_S16BE;
 316             ss->rate = 44100;
 317             break;
 318
 319         case 11:
 320             ss->channels = 1;
 321             ss->format = PA_SAMPLE_S16BE;
 322             ss->rate = 44100;
 323             break;
 324
 325         default:
 326             return NULL;
 327     }
 328
 329     return ss;
 330 }
 331
 332 pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss) {
 333     pa_assert(ss);
 334
 335     if (!pa_rtp_sample_spec_valid(ss))
 336         ss->format = PA_SAMPLE_S16BE;
 337
 338     pa_assert(pa_rtp_sample_spec_valid(ss));
 339     return ss;
 340 }
 341
 342 int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
 343     pa_assert(ss);
 344
 345     if (!pa_sample_spec_valid(ss))
 346         return 0;
 347
 348     return
 349         ss->format == PA_SAMPLE_U8 ||
 350         ss->format == PA_SAMPLE_ALAW ||
 351         ss->format == PA_SAMPLE_ULAW ||
 352         ss->format == PA_SAMPLE_S16BE;
 353 }
 354
 355 void pa_rtp_context_destroy(pa_rtp_context *c) {
 356     pa_assert(c);
 357
 358     pa_assert_se(pa_close(c->fd) == 0);
 359
 360     if (c->memchunk.memblock)
 361         pa_memblock_unref(c->memchunk.memblock);
 362 }
 363
 364 const char* pa_rtp_format_to_string(pa_sample_format_t f) {
 365     switch (f) {
 366         case PA_SAMPLE_S16BE:
 367             return "L16";
 368         case PA_SAMPLE_U8:
 369             return "L8";
 370         case PA_SAMPLE_ALAW:
 371             return "PCMA";
 372         case PA_SAMPLE_ULAW:
 373             return "PCMU";
 374         default:
 375             return NULL;
 376     }
 377 }
 378
 379 pa_sample_format_t pa_rtp_string_to_format(const char *s) {
 380     pa_assert(s);
 381
 382     if (!(strcmp(s, "L16")))
 383         return PA_SAMPLE_S16BE;
 384     else if (!strcmp(s, "L8"))
 385         return PA_SAMPLE_U8;
 386     else if (!strcmp(s, "PCMA"))
 387         return PA_SAMPLE_ALAW;
 388     else if (!strcmp(s, "PCMU"))
 389         return PA_SAMPLE_ULAW;
 390     else
 391         return PA_SAMPLE_INVALID;
 392 }