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/*C
(c) 2005 bl0rg.net
**/
#include "conf.h"
#ifdef NEED_GETOPT_H__
#include <getopt.h>
#endif
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <string.h>
#include "mp3.h"
#include "network.h"
#include "fec-pkt.h"
#include "fec.h"
#include "pack.h"
#include "aq.h"
#include "signal.h"
#ifdef WITH_IPV6
static int use_ipv6 = 0;
#endif /* WITH_IPV6 */
#define MAX_FILENAME 256
#ifdef DEBUG_PLOSS
int ploss_rate = 20;
#endif /* DEBUG_PLOSS */
/*M
\emph{Maximal synchronization latency for sending packets.}
In usecs.
**/
#define MAX_WAIT_TIME (1 * 1000 * 1000)
static int finished = 0;
int quiet = 0;
unsigned char fec_k = 20;
unsigned char fec_n = 25;
fec_pkt_t pkt;
static void sig_int(int signo) {
finished = 1;
}
/*M
**/
int poc_encoder(int sock, struct sockaddr_in *saddr, char *filename) {
int retval = 1;
/*M
Open file for reading.
**/
file_t mp3_file;
if (!file_open_read(&mp3_file, filename)) {
fprintf(stderr, "Could not open mp3 file: %s\n", filename);
return 0;
}
/*M
Initialize the FEC parameters.
**/
fec_t *fec = fec_new(fec_k, fec_n);
aq_t adu_queue;
aq_init(&adu_queue);
adu_t *in_adus[fec_k];
unsigned int cnt = 0;
static long wait_time = 0;
unsigned long fec_time = 0;
unsigned long fec_time2 = 0;
/*M
Get start time.
**/
struct timeval tv;
gettimeofday(&tv, NULL);
unsigned long start_sec, start_usec;
start_sec = tv.tv_sec;
start_usec = tv.tv_usec;
/*M
Get next MP3 frame and queue it into the ADU queue.
**/
mp3_frame_t mp3_frame;
while ((mp3_next_frame(&mp3_file, &mp3_frame) > 0) && !finished) {
if (aq_add_frame(&adu_queue, &mp3_frame) > 0) {
/* a new ADU has been produced */
in_adus[cnt] = aq_get_adu(&adu_queue);
assert(in_adus[cnt] != NULL);
/* check if the FEC group is complete */
if (++cnt == fec_k) {
unsigned int max_len = 0;
unsigned long group_duration = 0;
int i;
for (i = 0; i < fec_k; i++) {
unsigned int adu_len = mp3_frame_size(in_adus[i]);
if (adu_len > max_len)
max_len = adu_len;
group_duration += in_adus[i]->usec;
}
fec_time += group_duration;
assert(max_len < FEC_PKT_PAYLOAD_SIZE);
/* Encode the FEC group */
unsigned char *in_ptrs[fec_k];
unsigned char buf[fec_k * max_len];
unsigned char *ptr = buf;
unsigned long bitrate = 0;
for (i = 0; i < fec_k; i++) {
unsigned int adu_len = mp3_frame_size(in_adus[i]);
in_ptrs[i] = ptr;
memcpy(ptr, in_adus[i]->raw, adu_len);
if (adu_len < max_len)
memset(ptr + adu_len, 0, max_len - adu_len);
ptr += max_len;
bitrate += in_adus[i]->bitrate;
}
bitrate /= fec_k;
for (i = 0; i < fec_n; i++) {
pkt.hdr.packet_seq = i;
pkt.hdr.fec_k = fec_k;
pkt.hdr.fec_n = fec_n;
pkt.hdr.fec_len = max_len + 2;
pkt.hdr.group_tstamp = fec_time;
fec_encode(fec, in_ptrs, pkt.payload, i, max_len);
if (i < fec_k) {
pkt.hdr.len = mp3_frame_size(in_adus[i]);
} else {
pkt.hdr.len = max_len;
}
/*M
Simulate packet loss.
**/
#ifdef DEBUG_PLOSS
if ((random() % 100) >= ploss_rate ) {
#endif /* DEBUG_PLOSS */
#ifdef DEBUG
fprintf(stderr,
"sending fec packet group stamp %ld, gseq %d, pseq %d, size %d\n",
pkt.hdr.group_tstamp, pkt.hdr.group_seq, pkt.hdr.packet_seq, pkt.hdr.len);
#endif
/* send rtp packet */
if (fec_pkt_sendto(&pkt, sock, (struct sockaddr *)saddr, sizeof(*saddr)) < 0) {
if (errno == ENOBUFS) {
fprintf(stderr, "Output buffers full, waiting...\n");
} else {
perror("Error while sending packet");
retval = 0;
goto exit;
}
}
#ifdef DEBUG_PLOSS
}
#endif /* DEBUG_PLOSS */
/*M
Update the time we have to wait.
**/
wait_time += (group_duration / fec_n);
fec_time2 += (group_duration / fec_n);
/*M
Sender synchronisation (\verb|sleep| until the next
packet has to be sent.
**/
if (wait_time > 1000)
usleep(wait_time);
if (!quiet) {
static unsigned int count = 0;
if ((count++ % 10) == 0) {
if (mp3_file.size > 0) {
fprintf(stdout,
"\r%02ld:%02ld/%02ld:%02ld %7ld/%7ld %3ldkbit/s (%3ld%%) ",
(fec_time2/1000000) / 60,
(fec_time2/1000000) % 60,
(long)((float)(fec_time/1000) /
((float)mp3_file.offset+1) * (float)mp3_file.size) /
60000,
(long)((float)(fec_time/1000) /
((float)mp3_file.offset+1) * (float)mp3_file.size) /
1000 % 60,
mp3_file.offset,
mp3_file.size,
bitrate,
(long)(100*(float)mp3_file.offset/(float)mp3_file.size));
} else {
fprintf(stdout, "\r%02ld:%02ld %ld %3ldkbit/s ",
(fec_time2/1000000) / 60,
(fec_time2/1000000) % 60,
mp3_file.offset,
bitrate);
}
fflush(stdout);
}
}
/*M
Get length of iteration.
**/
gettimeofday(&tv, NULL);
unsigned long len =
(tv.tv_sec - start_sec) * 1000000 + (tv.tv_usec - start_usec);
wait_time -= len;
if (abs(wait_time) > MAX_WAIT_TIME)
wait_time = 0;
start_sec = tv.tv_sec;
start_usec = tv.tv_usec;
}
pkt.hdr.group_seq++;
for (i = 0; i < fec_k; i++)
free(in_adus[i]);
cnt = 0;
}
}
}
int i;
exit:
for (i = 0; i < cnt; i++)
free(in_adus[i]);
aq_destroy(&adu_queue);
fec_free(fec);
file_close(&mp3_file);
return retval;
}
/*M
\emph{Print usage information.}
**/
static void usage(void) {
fprintf(stderr,
"Usage: ./poc-fec [-s address] [-p port] [-k fec_k] [-n fec_n] [-q] [-t ttl]");
#ifdef WITH_IPV6
fprintf(stderr, " [-6]");
#endif /* WITH_IPV6 */
fprintf(stderr, " files...\n");
fprintf(stderr, "\t-s address : destination address (default 224.0.1.23 or ff02::4)\n");
fprintf(stderr, "\t-p port : destination port (default 1500)\n");
fprintf(stderr, "\t-q : quiet\n");
fprintf(stderr, "\t-t ttl : multicast ttl (default 1)\n");
fprintf(stderr, "\t-k fec_k : FEC k parameter (default 20)\n");
fprintf(stderr, "\t-n fec_n : FEC n parameter (default 25)\n");
#ifdef WITH_IPV6
fprintf(stderr, "\t-6 : use ipv6\n");
#endif /* WITH_IPV6 */
}
/*M
\emph{Main server routine.}
Calls the mainloop for each filename given on the command line.
**/
int main(int argc, char *argv[]) {
int retval = 0;
char *address = NULL;
unsigned short port = 1500;
unsigned int ttl = 1;
/*M
Process the command line arguments.
**/
int c;
while ((c = getopt(argc, argv, "hs:p:t:qP:k:n:"
#ifdef WITH_IPV6
"6"
#endif /* WITH_IPV6 */
)) >= 0) {
switch (c) {
#ifdef WITH_IPV6
case '6':
use_ipv6 = 1;
break;
#endif /* WITH_IPV6 */
case 's':
if (address != NULL)
free(address);
address = strdup(optarg);
break;
case 'p':
port = (unsigned short)atoi(optarg);
break;
case 'q':
quiet = 1;
break;
case 't':
ttl = (unsigned int)atoi(optarg);
break;
case 'k':
fec_k = (unsigned int)atoi(optarg);
break;
case 'n':
fec_n = (unsigned int)atoi(optarg);
break;
#ifdef DEBUG_PLOSS
case 'P':
{
static struct timeval tv;
gettimeofday(&tv, NULL);
srandom(tv.tv_sec);
ploss_rate = atoi(optarg);
break;
}
#endif /* DEBUG_PLOSS */
case 'h':
default:
usage();
retval = EXIT_FAILURE;
goto exit;
}
}
if (fec_n <= fec_k) {
fprintf(stderr, "fec_n must be bigger than fec_k\n");
retval = EXIT_FAILURE;
goto exit;
}
if (optind == argc) {
usage();
retval = EXIT_FAILURE;
goto exit;
}
if (address == NULL) {
#ifdef WITH_IPV6
if (use_ipv6)
address = strdup("ff02::4");
else
address = strdup("224.0.1.23");
#else
address = strdup("224.0.1.23");
#endif /* WITH_IPV6 */
}
if (sig_set_handler(SIGINT, sig_int) == SIG_ERR) {
retval = EXIT_FAILURE;
goto exit;
}
/*M
Open the sending socket.
**/
int sock;
struct sockaddr_in saddr;
if (!net_ip4_resolve_hostname(address, port, NULL, &saddr)) {
fprintf(stderr, "Could not resolve %s\n", address);
retval = EXIT_FAILURE;
goto exit;
}
sock = net_udp4_socket(&saddr, port, ttl);
if (sock < 0) {
fprintf(stderr, "Could not open socket\n");
retval = EXIT_FAILURE;
goto exit;
}
fec_pkt_init(&pkt);
/*M
Go through all files given on command line and stream them.
**/
int i;
for (i = optind; (i < argc) && !finished; i++) {
assert(argv[i] != NULL);
unsigned char filename[MAX_FILENAME];
strncpy(filename, argv[i], MAX_FILENAME - 1);
filename[MAX_FILENAME - 1] = '\0';
if (!poc_encoder(sock, &saddr, filename))
continue;
}
exit:
if (address != NULL)
free(address);
return retval;
}
/*M
*/
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