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-rw-r--r--src/modules/rtp/rtp.c364
1 files changed, 364 insertions, 0 deletions
diff --git a/src/modules/rtp/rtp.c b/src/modules/rtp/rtp.c
new file mode 100644
index 00000000..997fcc34
--- /dev/null
+++ b/src/modules/rtp/rtp.c
@@ -0,0 +1,364 @@
+/* $Id$ */
+
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2006 Lennart Poettering
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#ifdef HAVE_SYS_FILIO_H
+#include <sys/filio.h>
+#endif
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/core-util.h>
+
+#include "rtp.h"
+
+pa_rtp_context* pa_rtp_context_init_send(pa_rtp_context *c, int fd, uint32_t ssrc, uint8_t payload, size_t frame_size) {
+ pa_assert(c);
+ pa_assert(fd >= 0);
+
+ c->fd = fd;
+ c->sequence = (uint16_t) (rand()*rand());
+ c->timestamp = 0;
+ c->ssrc = ssrc ? ssrc : (uint32_t) (rand()*rand());
+ c->payload = payload & 127;
+ c->frame_size = frame_size;
+
+ return c;
+}
+
+#define MAX_IOVECS 16
+
+int pa_rtp_send(pa_rtp_context *c, size_t size, pa_memblockq *q) {
+ struct iovec iov[MAX_IOVECS];
+ pa_memblock* mb[MAX_IOVECS];
+ int iov_idx = 1;
+ size_t n = 0;
+
+ pa_assert(c);
+ pa_assert(size > 0);
+ pa_assert(q);
+
+ if (pa_memblockq_get_length(q) < size)
+ return 0;
+
+ for (;;) {
+ int r;
+ pa_memchunk chunk;
+
+ pa_memchunk_reset(&chunk);
+
+ if ((r = pa_memblockq_peek(q, &chunk)) >= 0) {
+
+ size_t k = n + chunk.length > size ? size - n : chunk.length;
+
+ pa_assert(chunk.memblock);
+
+ iov[iov_idx].iov_base = ((uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index);
+ iov[iov_idx].iov_len = k;
+ mb[iov_idx] = chunk.memblock;
+ iov_idx ++;
+
+ n += k;
+ pa_memblockq_drop(q, k);
+ }
+
+ pa_assert(n % c->frame_size == 0);
+
+ if (r < 0 || n >= size || iov_idx >= MAX_IOVECS) {
+ uint32_t header[3];
+ struct msghdr m;
+ int k, i;
+
+ if (n > 0) {
+ header[0] = htonl(((uint32_t) 2 << 30) | ((uint32_t) c->payload << 16) | ((uint32_t) c->sequence));
+ header[1] = htonl(c->timestamp);
+ header[2] = htonl(c->ssrc);
+
+ iov[0].iov_base = (void*)header;
+ iov[0].iov_len = sizeof(header);
+
+ m.msg_name = NULL;
+ m.msg_namelen = 0;
+ m.msg_iov = iov;
+ m.msg_iovlen = iov_idx;
+ m.msg_control = NULL;
+ m.msg_controllen = 0;
+ m.msg_flags = 0;
+
+ k = sendmsg(c->fd, &m, MSG_DONTWAIT);
+
+ for (i = 1; i < iov_idx; i++) {
+ pa_memblock_release(mb[i]);
+ pa_memblock_unref(mb[i]);
+ }
+
+ c->sequence++;
+ } else
+ k = 0;
+
+ c->timestamp += n/c->frame_size;
+
+ if (k < 0) {
+ if (errno != EAGAIN && errno != EINTR) /* If the queue is full, just ignore it */
+ pa_log("sendmsg() failed: %s", pa_cstrerror(errno));
+ return -1;
+ }
+
+ if (r < 0 || pa_memblockq_get_length(q) < size)
+ break;
+
+ n = 0;
+ iov_idx = 1;
+ }
+ }
+
+ return 0;
+}
+
+pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd, size_t frame_size) {
+ pa_assert(c);
+
+ c->fd = fd;
+ c->frame_size = frame_size;
+ return c;
+}
+
+int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) {
+ int size;
+ struct msghdr m;
+ struct iovec iov;
+ uint32_t header;
+ int cc;
+ ssize_t r;
+
+ pa_assert(c);
+ pa_assert(chunk);
+
+ pa_memchunk_reset(chunk);
+
+ if (ioctl(c->fd, FIONREAD, &size) < 0) {
+ pa_log_warn("FIONREAD failed: %s", pa_cstrerror(errno));
+ goto fail;
+ }
+
+ if (!size)
+ return 0;
+
+ chunk->memblock = pa_memblock_new(pool, size);
+
+ iov.iov_base = pa_memblock_acquire(chunk->memblock);
+ iov.iov_len = size;
+
+ m.msg_name = NULL;
+ m.msg_namelen = 0;
+ m.msg_iov = &iov;
+ m.msg_iovlen = 1;
+ m.msg_control = NULL;
+ m.msg_controllen = 0;
+ m.msg_flags = 0;
+
+ r = recvmsg(c->fd, &m, 0);
+ pa_memblock_release(chunk->memblock);
+
+ if (r != size) {
+ if (r < 0 && errno != EAGAIN && errno != EINTR)
+ pa_log_warn("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
+
+ goto fail;
+ }
+
+ if (size < 12) {
+ pa_log_warn("RTP packet too short.");
+ goto fail;
+ }
+
+ memcpy(&header, iov.iov_base, sizeof(uint32_t));
+ memcpy(&c->timestamp, (uint8_t*) iov.iov_base + 4, sizeof(uint32_t));
+ memcpy(&c->ssrc, (uint8_t*) iov.iov_base + 8, sizeof(uint32_t));
+
+ header = ntohl(header);
+ c->timestamp = ntohl(c->timestamp);
+ c->ssrc = ntohl(c->ssrc);
+
+ if ((header >> 30) != 2) {
+ pa_log_warn("Unsupported RTP version.");
+ goto fail;
+ }
+
+ if ((header >> 29) & 1) {
+ pa_log_warn("RTP padding not supported.");
+ goto fail;
+ }
+
+ if ((header >> 28) & 1) {
+ pa_log_warn("RTP header extensions not supported.");
+ goto fail;
+ }
+
+ cc = (header >> 24) & 0xF;
+ c->payload = (header >> 16) & 127;
+ c->sequence = header & 0xFFFF;
+
+ if (12 + cc*4 > size) {
+ pa_log_warn("RTP packet too short. (CSRC)");
+ goto fail;
+ }
+
+ chunk->index = 12 + cc*4;
+ chunk->length = size - chunk->index;
+
+ if (chunk->length % c->frame_size != 0) {
+ pa_log_warn("Bad RTP packet size.");
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ if (chunk->memblock)
+ pa_memblock_unref(chunk->memblock);
+
+ return -1;
+}
+
+uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
+ pa_assert(ss);
+
+ if (ss->format == PA_SAMPLE_ULAW && ss->rate == 8000 && ss->channels == 1)
+ return 0;
+ if (ss->format == PA_SAMPLE_ALAW && ss->rate == 8000 && ss->channels == 1)
+ return 8;
+ if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
+ return 10;
+ if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
+ return 11;
+
+ return 127;
+}
+
+pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
+ pa_assert(ss);
+
+ switch (payload) {
+ case 0:
+ ss->channels = 1;
+ ss->format = PA_SAMPLE_ULAW;
+ ss->rate = 8000;
+ break;
+
+ case 8:
+ ss->channels = 1;
+ ss->format = PA_SAMPLE_ALAW;
+ ss->rate = 8000;
+ break;
+
+ case 10:
+ ss->channels = 2;
+ ss->format = PA_SAMPLE_S16BE;
+ ss->rate = 44100;
+ break;
+
+ case 11:
+ ss->channels = 1;
+ ss->format = PA_SAMPLE_S16BE;
+ ss->rate = 44100;
+ break;
+
+ default:
+ return NULL;
+ }
+
+ return ss;
+}
+
+pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss) {
+ pa_assert(ss);
+
+ if (!pa_rtp_sample_spec_valid(ss))
+ ss->format = PA_SAMPLE_S16BE;
+
+ pa_assert(pa_rtp_sample_spec_valid(ss));
+ return ss;
+}
+
+int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
+ pa_assert(ss);
+
+ if (!pa_sample_spec_valid(ss))
+ return 0;
+
+ return
+ ss->format == PA_SAMPLE_U8 ||
+ ss->format == PA_SAMPLE_ALAW ||
+ ss->format == PA_SAMPLE_ULAW ||
+ ss->format == PA_SAMPLE_S16BE;
+}
+
+void pa_rtp_context_destroy(pa_rtp_context *c) {
+ pa_assert(c);
+
+ pa_close(c->fd);
+}
+
+const char* pa_rtp_format_to_string(pa_sample_format_t f) {
+ switch (f) {
+ case PA_SAMPLE_S16BE:
+ return "L16";
+ case PA_SAMPLE_U8:
+ return "L8";
+ case PA_SAMPLE_ALAW:
+ return "PCMA";
+ case PA_SAMPLE_ULAW:
+ return "PCMU";
+ default:
+ return NULL;
+ }
+}
+
+pa_sample_format_t pa_rtp_string_to_format(const char *s) {
+ pa_assert(s);
+
+ if (!(strcmp(s, "L16")))
+ return PA_SAMPLE_S16BE;
+ else if (!strcmp(s, "L8"))
+ return PA_SAMPLE_U8;
+ else if (!strcmp(s, "PCMA"))
+ return PA_SAMPLE_ALAW;
+ else if (!strcmp(s, "PCMU"))
+ return PA_SAMPLE_ULAW;
+ else
+ return PA_SAMPLE_INVALID;
+}
+
generated by cgit (git 2.34.1) at 2025-07-12 12:29:35 +0000