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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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.
polypaudio 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 polypaudio; 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 <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <polypcore/log.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) {
assert(c);
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, skip = 0;
assert(c);
assert(size > 0);
assert(q);
if (pa_memblockq_get_length(q) < size)
return 0;
for (;;) {
int r;
pa_memchunk chunk;
if ((r = pa_memblockq_peek(q, &chunk)) >= 0) {
size_t k = n + chunk.length > size ? size - n : chunk.length;
if (chunk.memblock) {
iov[iov_idx].iov_base = (uint8_t*) chunk.memblock->data + chunk.index;
iov[iov_idx].iov_len = k;
mb[iov_idx] = chunk.memblock;
iov_idx ++;
n += k;
}
skip += k;
pa_memblockq_drop(q, &chunk, k);
}
if (r < 0 || !chunk.memblock || 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 = 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_unref(mb[i]);
c->sequence++;
} else
k = 0;
c->timestamp += skip/c->frame_size;
if (k < 0) {
if (errno != EAGAIN) /* If the queue is full, just ignore it */
pa_log(__FILE__": sendmsg() failed: %s", strerror(errno));
return -1;
}
if (r < 0 || pa_memblockq_get_length(q) < size)
break;
n = 0;
skip = 0;
iov_idx = 1;
}
}
return 0;
}
pa_rtp_context* pa_rtp_context_init_recv(pa_rtp_context *c, int fd) {
assert(c);
c->fd = fd;
return c;
}
int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk) {
assert(c);
assert(chunk);
return 0;
}
uint8_t pa_rtp_payload_type(const pa_sample_spec *ss) {
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 0;
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_fixup(pa_sample_spec * ss) {
assert(ss);
if (!pa_rtp_sample_spec_valid(ss))
ss->format = PA_SAMPLE_S16BE;
assert(pa_rtp_sample_spec_valid(ss));
return ss;
}
int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
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) {
assert(c);
close(c->fd);
}
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