4 This file is part of PulseAudio.
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.
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.
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
31 #include <arpa/inet.h>
33 #include <sys/ioctl.h>
35 #ifdef HAVE_SYS_FILIO_H
36 #include <sys/filio.h>
39 #include <pulsecore/core-error.h>
40 #include <pulsecore/log.h>
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) {
49 c->sequence = (uint16_t) (rand()*rand());
51 c->ssrc = ssrc ? ssrc : (uint32_t) (rand()*rand());
52 c->payload = payload & 127;
53 c->frame_size = frame_size;
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];
64 size_t n = 0, skip = 0;
70 if (pa_memblockq_get_length(q) < size)
77 if ((r = pa_memblockq_peek(q, &chunk)) >= 0) {
79 size_t k = n + chunk.length > size ? size - n : chunk.length;
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;
91 pa_memblockq_drop(q, &chunk, k);
94 if (r < 0 || !chunk.memblock || n >= size || iov_idx >= MAX_IOVECS) {
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);
104 iov[0].iov_base = (void*)header;
105 iov[0].iov_len = sizeof(header);
110 m.msg_iovlen = iov_idx;
111 m.msg_control = NULL;
112 m.msg_controllen = 0;
115 k = sendmsg(c->fd, &m, MSG_DONTWAIT);
117 for (i = 1; i < iov_idx; i++)
118 pa_memblock_unref(mb[i]);
124 c->timestamp += skip/c->frame_size;
127 if (errno != EAGAIN) /* If the queue is full, just ignore it */
128 pa_log("sendmsg() failed: %s", pa_cstrerror(errno));
132 if (r < 0 || pa_memblockq_get_length(q) < size)
144 pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd, size_t frame_size) {
148 c->frame_size = frame_size;
152 int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) {
163 chunk->memblock = NULL;
165 if (ioctl(c->fd, FIONREAD, &size) < 0) {
166 pa_log("FIONREAD failed: %s", pa_cstrerror(errno));
173 chunk->memblock = pa_memblock_new(pool, size);
175 iov.iov_base = chunk->memblock->data;
182 m.msg_control = NULL;
183 m.msg_controllen = 0;
186 if ((r = recvmsg(c->fd, &m, 0)) != size) {
187 pa_log("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
192 pa_log("RTP packet too short.");
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));
200 header = ntohl(header);
201 c->timestamp = ntohl(c->timestamp);
202 c->ssrc = ntohl(c->ssrc);
204 if ((header >> 30) != 2) {
205 pa_log("Unsupported RTP version.");
209 if ((header >> 29) & 1) {
210 pa_log("RTP padding not supported.");
214 if ((header >> 28) & 1) {
215 pa_log("RTP header extensions not supported.");
219 cc = (header >> 24) & 0xF;
220 c->payload = (header >> 16) & 127;
221 c->sequence = header & 0xFFFF;
223 if (12 + cc*4 > size) {
224 pa_log("RTP packet too short. (CSRC)");
228 chunk->index = 12 + cc*4;
229 chunk->length = size - chunk->index;
231 if (chunk->length % c->frame_size != 0) {
232 pa_log("Vad RTP packet size.");
240 pa_memblock_unref(chunk->memblock);
245 uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
248 if (ss->format == PA_SAMPLE_ULAW && ss->rate == 8000 && ss->channels == 1)
250 if (ss->format == PA_SAMPLE_ALAW && ss->rate == 8000 && ss->channels == 1)
252 if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
254 if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
260 pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
266 ss->format = PA_SAMPLE_ULAW;
272 ss->format = PA_SAMPLE_ALAW;
278 ss->format = PA_SAMPLE_S16BE;
284 ss->format = PA_SAMPLE_S16BE;
295 pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss) {
298 if (!pa_rtp_sample_spec_valid(ss))
299 ss->format = PA_SAMPLE_S16BE;
301 assert(pa_rtp_sample_spec_valid(ss));
305 int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
308 if (!pa_sample_spec_valid(ss))
312 ss->format == PA_SAMPLE_U8 ||
313 ss->format == PA_SAMPLE_ALAW ||
314 ss->format == PA_SAMPLE_ULAW ||
315 ss->format == PA_SAMPLE_S16BE;
318 void pa_rtp_context_destroy(pa_rtp_context *c) {
324 const char* pa_rtp_format_to_string(pa_sample_format_t f) {
326 case PA_SAMPLE_S16BE:
339 pa_sample_format_t pa_rtp_string_to_format(const char *s) {
342 if (!(strcmp(s, "L16")))
343 return PA_SAMPLE_S16BE;
344 else if (!strcmp(s, "L8"))
346 else if (!strcmp(s, "PCMA"))
347 return PA_SAMPLE_ALAW;
348 else if (!strcmp(s, "PCMU"))
349 return PA_SAMPLE_ULAW;
351 return PA_SAMPLE_INVALID;