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/*C
(c) 2005 bl0rg.net
**/
#include "conf.h"
#ifdef WITH_OPENSSL
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <string.h>
#include <errno.h>
#ifdef NEED_GETOPT_H__
#include <getopt.h>
#endif
#include "mp3.h"
#include "aq.h"
#include "network.h"
#include "rtp.h"
#include "signal.h"
#include "file.h"
#ifdef WITH_IPV6
static int use_ipv6 = 0;
#endif /* WITH_IPV6 */
#define MAX_FILENAME 256
#ifdef WITH_OPENSSL
RSA *rsa = NULL;
#endif
#ifdef DEBUG_PLOSS
int ploss_rate = 20;
#endif /* DEBUG_PLOSS */
static int finished = 0;
/*M
\emph{Maximal synchronization latency for sending packets.}
In usecs.
**/
#define MAX_WAIT_TIME (1 * 1000 * 1000)
rtp_pkt_t pkt;
static void sig_int(int signo) {
finished = 1;
}
unsigned long cksum(char *data, int len) {
unsigned long res = 0;
int i;
for (i = 0; i < len; i++)
res += data[i];
return res;
}
/*M
\emph{Simple RTP RFC3119 streaming server main loop.}
The mainloop opens the MPEG Audio file \verb|filename|, reads each
frame into an ADU queue, converts it into a MPEG adu (if possible),
fills an RTP packet with this new ADU, and sends it out using the
UDP socket \verb|sock|. After sending a packet, the mainloop sleeps
for the duration of the packet, synchronizing itself when the sleep
is not accurate enough. If the sleep desynchronizes itself from the
stream more than \verb|MAX_WAIT_TIME|, the synchronization is reset.
**/
int poc_mainloop(int sock, char *filename, int quiet) {
/*M
Open MPEG 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 ADU queue used to convert MPEG frames into MPEG
adus.
**/
aq_t adu_queue;
aq_init(&adu_queue);
static long wait_time = 0;
unsigned long rtp_time = 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
Cycle through the frames, convert them to ADUs and send them using RTP.
**/
mp3_frame_t mp3_frame;
while ((mp3_next_frame(&mp3_file, &mp3_frame) > 0) && !finished) {
/*M
Add the MPEG frame to the adu queue.
**/
if (aq_add_frame(&adu_queue, &mp3_frame)) {
/*M
An ADU could be generated.
**/
adu_t *adu = aq_get_adu(&adu_queue);
assert(adu != NULL);
/*M
Fill rtp packet with the newly generated ADU.
**/
pkt.timestamp = (rtp_time) / 11.1111;
unsigned char *ptr = pkt.data + pkt.hlen;
/* need an extended header? */
pkt.length = mp3_frame_size(adu);
if (pkt.length > ((1 << 6) - 1))
ptr++;
memcpy(ptr, adu->raw, pkt.length);
/*M
Sign the packet if Openssl is activated.
**/
#ifdef WITH_OPENSSL
if (rsa != NULL) {
if (!rtp_pkt_sign(&pkt, rsa)) {
fprintf(stderr, "\nCould not sign packet\n");
free(adu);
aq_destroy(&adu_queue);
return 0;
}
pkt.b.pt = RTP_PT_SMPA;
}
#endif
/*M
Simulate packet loss.
**/
#ifdef DEBUG_PLOSS
if ((random() % 100) >= ploss_rate ) {
#endif /* DEBUG_PLOSS */
/* send rtp packet */
if (rtp_pkt_send(&pkt, sock) < 0) {
if (errno == ENOBUFS) {
fprintf(stderr, "Output buffers full, waiting...\n");
} else {
perror("Error while sending packet");
free(adu);
aq_destroy(&adu_queue);
return 0;
}
}
#ifdef DEBUG_PLOSS
}
#endif /* DEBUG_PLOSS */
/*M
Update the MPEG timestamp.
**/
rtp_time += adu->usec;
/*M
Update the time we have to wait.
**/
wait_time += adu->usec;
/*M
Sender synchronisation (\verb|sleep| until the next ADU has
to be sent.
**/
if (wait_time > 1000)
usleep(wait_time);
/*M
Print sender information.
**/
if (!quiet) {
static int count = 0;
if ((count++ % 10) == 0) {
if (mp3_file.size > 0) {
fprintf(stdout,
"\r%02ld:%02ld/%02ld:%02ld %7ld/%7ld (%3ld%%) %3ldkbit/s %4ldb ",
(rtp_time/1000000) / 60,
(rtp_time/1000000) % 60,
(long)((float)(rtp_time/1000) /
((float)mp3_file.offset+1) * (float)mp3_file.size) /
60000,
(long)((float)(rtp_time/1000) /
((float)mp3_file.offset+1) * (float)mp3_file.size) /
1000 % 60,
mp3_file.offset,
mp3_file.size,
(long)(100*(float)mp3_file.offset/(float)mp3_file.size),
adu->bitrate,
adu->adu_size);
} else {
fprintf(stdout, "\r%02ld:%02ld %ld %3ldkbit/s %4ldb ",
(rtp_time/1000000) / 60,
(rtp_time/1000000) % 60,
mp3_file.offset,
adu->bitrate,
adu->adu_size);
}
}
fflush(stdout);
}
free(adu);
}
/*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;
}
/*M
Destroy the ADU queue and close the MPEG file.
**/
aq_destroy(&adu_queue);
if (!file_close(&mp3_file)) {
fprintf(stderr, "Could not close mp3 file\n");
return 0;
}
return 1;
}
/*M
\emph{Print usage information.}
**/
static void usage(void) {
fprintf(stderr,
"Usage: ./poc [-s address] [-p port] [-q] [-t ttl]");
#ifdef WITH_OPENSSL
fprintf(stderr, " [-c pem]");
#endif /* WITH_OPENSSL */
#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");
#ifdef WITH_OPENSSL
fprintf(stderr, "\t-c pem : sign with private RSA key\n");
#endif /* WITH_OPENSSL */
#ifdef DEBUG_PLOSS
fprintf(stderr, "\t-P ploss : packet loss interval\n");
#endif /* DEBUG_PLOSS */
#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;
int quiet = 0;
/*M
Process the command line arguments.
**/
int c;
while ((c = getopt(argc, argv, "hs:p:t:qc:P:"
#ifdef WITH_OPENSSL
"c:"
#endif /* WITH_OPENSSL */
#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;
/*M
If Openssl is used, read in the RSA key.
**/
#ifdef WITH_OPENSSL
case 'c':
{
if (rsa != NULL) {
RSA_free(rsa);
rsa = NULL;
}
FILE *f = NULL;
if (!(f = fopen(optarg, "r"))) {
fprintf(stderr,
"Could not open private key %s\n",
optarg);
retval = EXIT_FAILURE;
goto exit;
}
if (!(rsa = PEM_read_RSAPrivateKey(f, NULL, NULL, NULL))) {
fprintf(stderr,
"Could not read private key %s\n",
optarg);
fclose(f);
retval = EXIT_FAILURE;
goto exit;
}
fclose(f);
OpenSSL_add_all_digests();
break;
}
#endif /* WITH_OPENSSL */
#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 (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;
#ifdef WITH_IPV6
if (use_ipv6)
sock = net_udp6_send_socket(address, port, ttl);
else
sock = net_udp4_send_socket(address, port, ttl);
#else
sock = net_udp4_send_socket(address, port, ttl);
#endif /* WITH_IPV6 */
if (sock < 0) {
fprintf(stderr, "Could not open socket\n");
retval = EXIT_FAILURE;
goto exit;
}
/*M
Initialize the RTP packet (fill common header fields).
**/
rtp_rfc3119_pkt_init(&pkt);
pkt.b.pt = RTP_DYN;
pkt.b.m = 0;
/*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_mainloop(sock, filename, quiet))
continue;
}
exit:
#ifdef WITH_OPENSSL
if (rsa != NULL)
RSA_free(rsa);
#endif
if (address != NULL)
free(address);
return retval;
}
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