Thepa ea sehlooho e nkiloe ho ea ka
Ho sebelisa TShark ho sekaseka lipakete tsa RTP
Qetellong
Sehloohong sena, re tsoela pele ho ithuta phetisetso ea matshwao a molumo re sebelisa protocol ea RTP. Taba ea pele, a re aroleng kopo ea rona ea tlhahlobo hore e be mochini o fetisang le moamoheli 'me re ithute ho hlahloba molatsoana oa RTP re sebelisa sehlahlobi sa sephethephethe sa marang-rang.
Kahoo, e le hore re bone ka ho hlaka hore na ke likarolo life tsa lenaneo tse ikarabellang bakeng sa phetisetso ea RTP le tse ikarabellang ho e amohela, re arola faele ea rona ea mstest6.c ka mananeo a mabeli a ikemetseng bakeng sa transmitter le moamoheli; re tla beha mesebetsi e tloaelehileng eo bobeli ba e sebelisang. faeleng ea boraro , eo re tla e bitsa mstest_common.c, e tla hokahanngoa ke transmitter le receiver ho sebelisa taelo e kenyelletsang:
/* Π€Π°ΠΉΠ» mstest_common.c ΠΠ±ΡΠΈΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ Π΄Π»Ρ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡΠΈΠΊΠ° ΠΈ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΈΠΊΠ°. */
#include <mediastreamer2/msfilter.h>
#include <mediastreamer2/msticker.h>
#include <mediastreamer2/msrtp.h>
#include <ortp/rtpsession.h>
#include <ortp/payloadtype.h>
define PCMU 0
/*---------------------------------------------------------*/
/* Π€ΡΠ½ΠΊΡΠΈΡ ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΈΠΈ ΡΠΈΠΏΠΎΠ² ΠΏΠΎΠ»Π΅Π·Π½ΡΡ
Π½Π°Π³ΡΡΠ·ΠΎΠΊ. */
void register_payloads(void)
{
/* Π Π΅Π³ΠΈΡΡΡΠΈΡΡΠ΅ΠΌ ΡΠΈΠΏΡ Π½Π°Π³ΡΡΠ·ΠΎΠΊ Π² ΡΠ°Π±Π»ΠΈΡΠ΅ ΠΏΡΠΎΡΠΈΠ»Π΅ΠΉ. ΠΠΎΠ·Π΄Π½Π΅Π΅, ΠΏΠΎ ΠΈΠ½Π΄Π΅ΠΊΡΡ Π²Π·ΡΡΠΎΠΌΡ
ΠΈΠ· Π·Π°Π³ΠΎΠ»ΠΎΠ²ΠΊΠ° RTP-ΠΏΠ°ΠΊΠ΅ΡΠ° ΠΈΠ· ΡΡΠΎΠΉ ΡΠ°Π±Π»ΠΈΡΡ Π±ΡΠ΄ΡΡ ΠΈΠ·Π²Π»Π΅ΠΊΠ°ΡΡΡΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ
Π½Π°Π³ΡΡΠ·ΠΊΠΈ, Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡΠ΅ Π΄Π»Ρ Π΄Π΅ΠΊΠΎΠ΄ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π°Π½Π½ΡΡ
ΠΏΠ°ΠΊΠ΅ΡΠ°. */
rtp_profile_set_payload (&av_profile, PCMU, &payload_type_pcm8000);
}
/*---------------------------------------------------------*/
/* ΠΡΠ° ΡΡΠ½ΠΊΡΠΈΡ ΡΠΎΠ·Π΄Π°Π½Π° ΠΈΠ· ΡΡΠ½ΠΊΡΠΈΠΈ create_duplex_rtpsession() Π² audiostream.c ΠΌΠ΅Π΄ΠΈΠ°ΡΡΡΠΈΠΌΠ΅ΡΠ°2. */
static RtpSession *create_rtpsession (int loc_rtp_port, int loc_rtcp_port, bool_t ipv6, RtpSessionMode mode)
{
RtpSession *rtpr; rtpr = rtp_session_new ((int) mode);
rtp_session_set_scheduling_mode (rtpr, 0);
rtp_session_set_blocking_mode (rtpr, 0);
rtp_session_enable_adaptive_jitter_compensation (rtpr, TRUE);
rtp_session_set_symmetric_rtp (rtpr, TRUE);
rtp_session_set_local_addr (rtpr, ipv6 ? "::" : "0.0.0.0", loc_rtp_port, loc_rtcp_port);
rtp_session_signal_connect (rtpr, "timestamp_jump", (RtpCallback) rtp_session_resync, 0);
rtp_session_signal_connect (rtpr, "ssrc_changed", (RtpCallback) rtp_session_resync, 0);
rtp_session_set_ssrc_changed_threshold (rtpr, 0);
rtp_session_set_send_payload_type(rtpr, PCMU);
/* ΠΠΎ ΡΠΌΠΎΠ»ΡΠ°Π½ΠΈΡ Π²ΡΠΊΠ»ΡΡΠ°Π΅ΠΌ RTCP-ΡΠ΅ΡΡΠΈΡ, ΡΠ°ΠΊ ΠΊΠ°ΠΊ Π½Π°Ρ ΠΏΡΠ»ΡΡ Π½Π΅ Π±ΡΠ΄Π΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ
Π΅Ρ. */
rtp_session_enable_rtcp (rtpr, FALSE);
return rtpr;
}
Joale faele ea transmitter e arohaneng:
/* Π€Π°ΠΉΠ» mstest6.c ΠΠΌΠΈΡΠ°ΡΠΎΡ ΠΏΡΠ»ΡΡΠ° ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ (ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡΠΈΠΊΠ°). */
#include <mediastreamer2/dtmfgen.h>
#include <mediastreamer2/msrtp.h>
#include "mstest_common.c"
/*----------------------------------------------------------*/
int main()
{
ms_init();
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΊΠ·Π΅ΠΌΠΏΠ»ΡΡΡ ΡΠΈΠ»ΡΡΡΠΎΠ². */
MSFilter *voidsource = ms_filter_new(MS_VOID_SOURCE_ID);
MSFilter *dtmfgen = ms_filter_new(MS_DTMF_GEN_ID);
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΈΠ»ΡΡΡ ΠΊΠΎΠ΄Π΅ΡΠ°. */
MSFilter *encoder = ms_filter_create_encoder("PCMU");
/* Π Π΅Π³ΠΈΡΡΡΠΈΡΡΠ΅ΠΌ ΡΠΈΠΏΡ Π½Π°Π³ΡΡΠ·ΠΊΠΈ. */
register_payloads();
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ RTP-ΡΠ΅ΡΡΠΈΡ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡΠΈΠΊΠ°. */
RtpSession *tx_rtp_session = create_rtpsession (8010, 8011, FALSE, RTP_SESSION_SENDONLY);
rtp_session_set_remote_addr_and_port(tx_rtp_session,"127.0.0.1", 7010, 7011);
rtp_session_set_send_payload_type(tx_rtp_session, PCMU);
MSFilter *rtpsend = ms_filter_new(MS_RTP_SEND_ID);
ms_filter_call_method(rtpsend, MS_RTP_SEND_SET_SESSION, tx_rtp_session);
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ ΡΠ°ΠΊΡΠΎΠ² - ΡΠΈΠΊΠ΅Ρ. */
MSTicker *ticker_tx = ms_ticker_new();
/* Π‘ΠΎΠ΅Π΄ΠΈΠ½ΡΠ΅ΠΌ ΡΠΈΠ»ΡΡΡΡ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡΠΈΠΊΠ°. */
ms_filter_link(voidsource, 0, dtmfgen, 0);
ms_filter_link(dtmfgen, 0, encoder, 0);
ms_filter_link(encoder, 0, rtpsend, 0);
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ ΡΠ°ΠΊΡΠΎΠ². */
ms_ticker_attach(ticker_tx, voidsource);
/* ΠΠ°ΡΡΡΠ°ΠΈΠ²Π°Π΅ΠΌ ΡΡΡΡΠΊΡΡΡΡ, ΡΠΏΡΠ°Π²Π»ΡΡΡΡΡ Π²ΡΡ
ΠΎΠ΄Π½ΡΠΌ ΡΠΈΠ³Π½Π°Π»ΠΎΠΌ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ°. */
MSDtmfGenCustomTone dtmf_cfg;
dtmf_cfg.tone_name[0] = 0;
dtmf_cfg.duration = 1000;
dtmf_cfg.frequencies[0] = 440;
/* ΠΡΠ΄Π΅ΠΌ Π³Π΅Π½Π΅ΡΠΈΡΠΎΠ²Π°ΡΡ ΠΎΠ΄ΠΈΠ½ ΡΠΎΠ½, ΡΠ°ΡΡΠΎΡΡ Π²ΡΠΎΡΠΎΠ³ΠΎ ΡΠΎΠ½Π° ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠΌ Π² 0. */
dtmf_cfg.frequencies[1] = 0;
dtmf_cfg.amplitude = 1.0;
dtmf_cfg.interval = 0.;
dtmf_cfg.repeat_count = 0.;
/* ΠΡΠ³Π°Π½ΠΈΠ·ΡΠ΅ΠΌ ΡΠΈΠΊΠ» ΡΠΊΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π°ΠΆΠ°ΡΡΡ
ΠΊΠ»Π°Π²ΠΈΡ. ΠΠ²ΠΎΠ΄ Π½ΡΠ»Ρ Π·Π°Π²Π΅ΡΡΠ°Π΅Ρ
* ΡΠΈΠΊΠ» ΠΈ ΡΠ°Π±ΠΎΡΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΡ. */
char key='9';
printf("ΠΠ°ΠΆΠΌΠΈΡΠ΅ ΠΊΠ»Π°Π²ΠΈΡΡ ΠΊΠΎΠΌΠ°Π½Π΄Ρ, Π·Π°ΡΠ΅ΠΌ Π²Π²ΠΎΠ΄.n"
"ΠΠ»Ρ Π·Π°Π²Π΅ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΡ Π²Π²Π΅Π΄ΠΈΡΠ΅ 0.n");
while(key != '0')
{
key = getchar();
if ((key >= 49) && (key <= 54))
{
printf("ΠΡΠΏΡΠ°Π²Π»Π΅Π½Π° ΠΊΠΎΠΌΠ°Π½Π΄Π°: %cn", key);
/* Π£ΡΡΠ°Π½Π°Π²Π»ΠΈΠ²Π°Π΅ΠΌ ΡΠ°ΡΡΠΎΡΡ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ° Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ
* ΠΊΠΎΠ΄ΠΎΠΌ Π½Π°ΠΆΠ°ΡΠΎΠΉ ΠΊΠ»Π°Π²ΠΈΡΠΈ. */
dtmf_cfg.frequencies[0] = 440 + 100*(key-49);
/* ΠΠΊΠ»ΡΡΠ°Π΅ΠΌ Π·Π²ΡΠΊΠΎΠ²ΠΎΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡ c ΠΎΠ±Π½ΠΎΠ²Π»Π΅Π½Π½ΠΎΠΉ ΡΠ°ΡΡΠΎΡΠΎΠΉ. */
ms_filter_call_method(dtmfgen, MS_DTMF_GEN_PLAY_CUSTOM, (void*)&dtmf_cfg);
}
/* Π£ΠΊΠ»Π°Π΄ΡΠ²Π°Π΅ΠΌ ΡΡΠ΅Π΄ Π² ΡΠΏΡΡΠΊΡ Π½Π° 20ΠΌΡ, ΡΡΠΎΠ±Ρ Π΄ΡΡΠ³ΠΈΠ΅ ΡΡΠ΅Π΄Ρ
* ΠΏΡΠΈΠ»ΠΎΠΆΠ΅Π½ΠΈΡ ΠΏΠΎΠ»ΡΡΠΈΠ»ΠΈ Π²ΡΠ΅ΠΌΡ Π½Π° ΡΠ°Π±ΠΎΡΡ. */
ms_usleep(20000);
}
}
Qetellong, file ea moamoheli:
/* Π€Π°ΠΉΠ» mstest7.c ΠΠΌΠΈΡΠ°ΡΠΎΡ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΈΠΊΠ°. */
include <mediastreamer2/mssndcard.h>
include <mediastreamer2/mstonedetector.h>
include <mediastreamer2/msrtp.h>
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ Π·Π°Π³ΠΎΠ»ΠΎΠ²ΠΎΡΠ½ΡΠΉ ΡΠ°ΠΉΠ» Ρ ΡΡΠ½ΠΊΡΠΈΡΠΌΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠΎΠ±ΡΡΠΈΡΠΌΠΈ ΠΌΠ΅Π΄ΠΈΠ°ΡΡΡΠΈΠΌΠ΅ΡΠ°.*/
include <mediastreamer2/mseventqueue.h>
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ ΡΠ°ΠΉΠ» ΠΎΠ±ΡΠΈΡ
ΡΡΠ½ΠΊΡΠΈΠΉ. */
include "mstest_common.c"
/* Π€ΡΠ½ΠΊΡΠΈΡ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ·ΠΎΠ²Π°, ΠΎΠ½Π° Π±ΡΠ΄Π΅Ρ Π²ΡΠ·Π²Π°Π½Π° ΡΠΈΠ»ΡΡΡΠΎΠΌ, ΠΊΠ°ΠΊ ΡΠΎΠ»ΡΠΊΠΎ ΠΎΠ½ ΠΎΠ±Π½Π°ΡΡΠΆΠΈΡ ΡΠΎΠ²ΠΏΠ°Π΄Π΅Π½ΠΈΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ Π²Ρ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Π° Ρ Π·Π°Π΄Π°Π½Π½ΡΠΌΠΈ. */
static void tone_detected_cb(void *data, MSFilter *f, unsigned int event_id,MSToneDetectorEvent *ev)
{
printf("ΠΡΠΈΠ½ΡΡΠ° ΠΊΠΎΠΌΠ°Π½Π΄Π°: %sn", ev->tone_name);
}
/*----------------------------------------------------------*/
int main()
{
ms_init();
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΊΠ·Π΅ΠΌΠΏΠ»ΡΡΡ ΡΠΈΠ»ΡΡΡΠΎΠ². */
MSSndCard *card_playback = ms_snd_card_manager_get_default_card(ms_snd_card_manager_get());
MSFilter *snd_card_write = ms_snd_card_create_writer(card_playback);
MSFilter *detector = ms_filter_new(MS_TONE_DETECTOR_ID);
/* ΠΡΠΈΡΠ°Π΅ΠΌ ΠΌΠ°ΡΡΠΈΠ² Π½Π°Ρ
ΠΎΠ΄ΡΡΠΈΠΉΡΡ Π²Π½ΡΡΡΠΈ Π΄Π΅ΡΠ΅ΠΊΡΠΎΡΠ° ΡΠΎΠ½ΠΎΠ², ΠΎΠ½ ΠΎΠΏΠΈΡΡΠ²Π°Π΅Ρ
* ΠΎΡΠΎΠ±ΡΠ΅ ΠΏΡΠΈΠΌΠ΅ΡΡ ΡΠ°Π·ΡΡΠΊΠΈΠ²Π°Π΅ΠΌΡΡ
ΡΠΈΠ³Π½Π°Π»ΠΎΠ².*/
ms_filter_call_method(detector, MS_TONE_DETECTOR_CLEAR_SCANS, 0);
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ ΠΊ ΡΠΈΠ»ΡΡΡΡ ΡΡΠ½ΠΊΡΠΈΡ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ·ΠΎΠ²Π°. */
ms_filter_set_notify_callback(detector, (MSFilterNotifyFunc)tone_detected_cb, NULL);
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΠΌΠ°ΡΡΠΈΠ², ΠΊΠ°ΠΆΠ΄ΡΠΉ ΡΠ»Π΅ΠΌΠ΅Π½Ρ ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΠΎΠΏΠΈΡΡΠ²Π°Π΅Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΡ
* ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΈΠ· ΡΠΎΠ½ΠΎΠ², ΠΊΠΎΡΠΎΡΡΠΉ ΡΡΠ΅Π±ΡΠ΅ΡΡΡ ΠΎΠ±Π½Π°ΡΡΠΆΠΈΠ²Π°ΡΡ:
Π’Π΅ΠΊΡΡΠΎΠ²ΠΎΠ΅ ΠΈΠΌΡ
* Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ°, ΡΠ°ΡΡΠΎΡΠ° Π² Π³Π΅ΡΡΠ°Ρ
, Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ Π² ΠΌΠΈΠ»Π»ΠΈΡΠ΅ΠΊΡΠ½Π΄Π°Ρ
,
* ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΡΠΉ ΡΡΠΎΠ²Π΅Π½Ρ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ 0,775Π. */
MSToneDetectorDef scan[6]=
{
{"V+",440, 100, 0.1}, /* ΠΠΎΠΌΠ°Π½Π΄Π° "Π£Π²Π΅Π»ΠΈΡΠΈΡΡ Π³ΡΠΎΠΌΠΊΠΎΡΡΡ". */
{"V-",540, 100, 0.1}, /* ΠΠΎΠΌΠ°Π½Π΄Π° "Π£ΠΌΠ΅Π½ΡΡΠΈΡΡ Π³ΡΠΎΠΌΠΊΠΎΡΡΡ". */
{"C+",640, 100, 0.1}, /* ΠΠΎΠΌΠ°Π½Π΄Π° "Π£Π²Π΅Π»ΠΈΡΠΈΡΡ Π½ΠΎΠΌΠ΅Ρ ΠΊΠ°Π½Π°Π»Π°". */
{"C-",740, 100, 0.1}, /* ΠΠΎΠΌΠ°Π½Π΄Π° "Π£ΠΌΠ΅Π½ΡΡΠΈΡΡ Π½ΠΎΠΌΠ΅Ρ ΠΊΠ°Π½Π°Π»Π°". */
{"ON",840, 100, 0.1}, /* ΠΠΎΠΌΠ°Π½Π΄Π° "ΠΠΊΠ»ΡΡΠΈΡΡ ΡΠ΅Π»Π΅Π²ΠΈΠ·ΠΎΡ". */
{"OFF", 940, 100, 0.1}/* ΠΠΎΠΌΠ°Π½Π΄Π° "ΠΡΠΊΠ»ΡΡΠΈΡΡ ΡΠ΅Π»Π΅Π²ΠΈΠ·ΠΎΡ". */
};
/* ΠΠ΅ΡΠ΅Π΄Π°Π΅ΠΌ "ΠΏΡΠΈΠΌΠ΅ΡΡ" ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Π΄Π΅ΡΠ΅ΠΊΡΠΎΡ ΡΠΎΠ½ΠΎΠ². */
int i;
for (i = 0; i < 6; i++)
{
ms_filter_call_method(detector, MS_TONE_DETECTOR_ADD_SCAN, &scan[i]);
}
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΡΠΈΠ»ΡΡΡ Π΄Π΅ΠΊΠΎΠ΄Π΅ΡΠ° */
MSFilter *decoder=ms_filter_create_decoder("PCMU");
/* Π Π΅Π³ΠΈΡΡΡΠΈΡΡΠ΅ΠΌ ΡΠΈΠΏΡ Π½Π°Π³ΡΡΠ·ΠΊΠΈ. */
register_payloads();
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ RTP-ΡΠ΅ΡΡΠΈΡ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΈΠΊΠ°. */
MSFilter *rtprecv = ms_filter_new(MS_RTP_RECV_ID);
RtpSession *rx_rtp_session = create_rtpsession (7010, 7011, FALSE, RTP_SESSION_RECVONLY);
ms_filter_call_method(rtprecv, MS_RTP_RECV_SET_SESSION, rx_rtp_session);
/* Π‘ΠΎΠ·Π΄Π°Π΅ΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ ΡΠ°ΠΊΡΠΎΠ² - ΡΠΈΠΊΠ΅Ρ. */
MSTicker *ticker_rx = ms_ticker_new();
/* Π‘ΠΎΠ΅Π΄ΠΈΠ½ΡΠ΅ΠΌ ΡΠΈΠ»ΡΡΡΡ ΠΏΡΠΈΡΠΌΠ½ΠΈΠΊΠ°. */
ms_filter_link(rtprecv, 0, decoder, 0);
ms_filter_link(decoder, 0, detector, 0);
ms_filter_link(detector, 0, snd_card_write, 0);
/* ΠΠΎΠ΄ΠΊΠ»ΡΡΠ°Π΅ΠΌ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ ΡΠ°ΠΊΡΠΎΠ². */
ms_ticker_attach(ticker_rx, rtprecv);
char key='9';
printf( "ΠΠ»Ρ Π·Π°Π²Π΅ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΡ Π²Π²Π΅Π΄ΠΈΡΠ΅ 0.n");
while(key != '0')
{
key = getchar();
/* Π£ΠΊΠ»Π°Π΄ΡΠ²Π°Π΅ΠΌ ΡΡΠ΅Π΄ Π² ΡΠΏΡΡΠΊΡ Π½Π° 20ΠΌΡ, ΡΡΠΎΠ±Ρ Π΄ΡΡΠ³ΠΈΠ΅ ΡΡΠ΅Π΄Ρ * ΠΏΡΠΈΠ»ΠΎΠΆΠ΅Π½ΠΈΡ ΠΏΠΎΠ»ΡΡΠΈΠ»ΠΈ Π²ΡΠ΅ΠΌΡ Π½Π° ΡΠ°Π±ΠΎΡΡ. */
ms_usleep(20000);
}
}
Re bokella transmitter le receiver, ebe re qala e 'ngoe le e' ngoe ka khomphutha ea eona. Ebe e lokela ho sebetsa joalo ka pele - ke rona feela re lokelang ho kenya linomoro ho tloha ho 1 ho isa ho 6 ho transmitter console, 'me karabelo ho bona e lokela ho hlaha ho "receiver console". Melumo e lokela ho utloahala ho sebui. Haeba ntho e 'ngoe le e' ngoe e le joalo, joale re thehile kamano pakeng tsa moamoheli le transmitter - ho na le phetiso e tsoelang pele ea lipakete tsa RTP ho tloha ho transmitter ho ea ho moamoheli.
Hona joale ke nako ea ho kenya analyzer ea sephethephethe; bakeng sa sena re tla kenya mofuta oa console oa lenaneo le letle la Wireshark - le bitsoa TShark. Ke khethile TShark bakeng sa lipuisano tse ling molemong oa ho nolofatsa tlhaloso ea tsamaiso ea lenaneo. Ka Wireshark, ke ne ke tla hloka li-screenshots tsa leoatle, tse ka felloang ke nako kapele ha ho lokolloa mofuta o mocha oa Wireshark.
Haeba u tseba ho sebelisa Wireshark, u ka e sebelisa ho ithuta mehlala ea rona. Empa le tabeng ena, ke khothaletsa hore o tsebe TShark, kaha e tla u thusa ho etsa tlhahlobo ea hau ea VoIP ka boits'oaro, hammoho le ho etsa ho ts'oara hole.
Kenya TShark ka taelo:
$ sudo apt-get install tshark
Ka tloaelo, re hlahloba sephetho sa ho kenya ka ho kopa mofuta oa lenaneo:
$ tshark --version
Haeba karabo e lekaneng e amoheloa, re tsoela pele ho ea pele.
Kaha lipakete tsa rona li kena ka har'a komporo hajoale, re ka bolella tshark ho bonts'a lipakete tse joalo feela. Ho etsa sena, o hloka ho khetha pakete ea ho ts'oaroa ho tsoa ho sehokelo mokokotlo (loopback) ka ho fetisa TShark khetho -ilo:
$ sudo tshark -i lo
Melaetsa e mabapi le lipakete tse rometsoeng ke transmitter ea rona e tla qala hang-hang ho tΕ‘ollela ka har'a khomphutha (ka nako e telele, ho sa tsotelehe hore na re tobetse konopo ho remote control kapa che). Mohlomong ho na le mananeo komporong ea hau a romellang lipakete ka loop ea lehae, moo re tla fumana motsoako oa lipakete tsa rona le tsa batho ba bang. Ho etsa bonnete ba hore lethathamong re bona lipakete feela tse rometsoeng ke remoutu ea rona, re tla eketsa filthara ka nomoro ea boema-kepe. Ka ho tobetsa Ctrl-C re emisa mohlahlobi ebe re kenya filthara bakeng sa nomoro ea boema-kepe eo taolo e hole e e sebelisang e le boema-kepe bakeng sa phetiso ea eona (8010): -f "udp port 8010". Joale mola oa rona oa taelo o tla shebahala tjena:
$ sudo tshark -i lo -f "udp port 8010"
Tlhahiso e latelang e tla hlaha ka har'a console (mela e 10 ea pele):
1 0.000000000 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
2 0.020059705 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
3 0.040044409 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
4 0.060057104 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
5 0.080082311 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
6 0.100597153 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
7 0.120122668 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
8 0.140204789 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
9 0.160719008 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
10 0.180673685 127.0.0.1 β 127.0.0.1 UDP 214 8010 β 7010 Len=172
Hajoale, tsena ha se lipakete, empa ke lenane le nang le linomoro tsa liketsahalo, moo mola o mong le o mong e leng molaetsa o mabapi le pakete e latelang e ileng ea hlokomeloa ho sehokelo. Kaha re se re hlokometse ho sefa lipakete, re bona lethathamong feela melaetsa e mabapi le lipakete tse tsoang ho transmitter ea rona. E latelang, ha re hlalose tafole ena ka linomoro tsa kholomo:
Nomoro ea ketsahalo.
Nako ea ho etsahala ha eona.
Aterese ea IP ea mohloli oa pakete le aterese ea IP ea pakete.
Protocol ea pakete e bontΕ‘oa e le UDP hobane lipakete tsa RTP li romelloa e le moputso ka har'a lipakete tsa UDP.
Boholo ba pakete ka li-byte.
Nomoro ea boema-kepe ba pakete le nomoro ea boema-kepe ea moo e eang teng.
Boholo ba moputso oa pakete, ho tloha mona re ka etsa qeto ea hore mochine oa rona o hlahisa lipakete tsa RTP tsa li-byte tse 172 ka boholo, tseo, joaloka letata sefubeng, li leng ka har'a pakete ea UDP ea li-byte tse 214 ka boholo.
Joale ke nako ea ho sheba ka har'a lipakete tsa UDP, bakeng sa sena re tla tsebisa TShark ka linotlolo tse atolositsoeng:
sudo tshark -i lo -f "udp port 8010" -P -V -O rtp -o rtp.heuristic_rtp:TRUE -x
Ka lebaka leo, tlhahiso ea lenaneo e tla ntlafatsoa - ho hlakoloa ha litaba tsa ka hare tsa sephutheloana se bakileng ho tla ekeletsoa ketsahalong ka 'ngoe. Ho sheba sephetho hantle, o ka emisa TShark ka ho tobetsa Ctrl-C, kapa u phetise tlhahiso ea eona faeleng ka ho eketsa phaephe ho lenaneo la tee ho taelo ea ho matha, u hlakisa lebitso la faele, tee <filename>:
$ sudo tshark -i lo -f "udp port 8010" -P -V -O rtp -o rtp.heuristic_rtp:TRUE -x | tee log.txt
Joale ha re shebeng hore na re na le eng faeleng, sephutheloana sa pele ke sena:
1 0.000000000 127.0.0.1 β 127.0.0.1 RTP 214 PT=ITU-T G.711 PCMU, SSRC=0x6B8B4567, Seq=58366, Time=355368720
Frame 1: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits) on interface 0
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1User Datagram Protocol, Src Port: 8010, Dst Port: 7010
Real-Time Transport Protocol [Stream setup by HEUR RT (frame 1)]
[Setup frame: 1]
[Setup Method: HEUR RT]
10.. .... = Version: RFC 1889 Version (2)
..0. .... = Padding: False
...0 .... = Extension: False
.... 0000 = Contributing source identifiers count: 0
0... .... = Marker: False
Payload type: ITU-T G.711 PCMU (0)
Sequence number: 58366 [Extended sequence number: 58366]
Timestamp: 355368720
Synchronization Source identifier: 0x6b8b4567 (1804289383)
Payload: ffffffffffffffffffffffffffffffffffffffffffffffff...
0000 00 00 00 00 00 00 00 00 00 00 00 00 08 00 45 00 ..............E.
0010 00 c8 3c 69 40 00 40 11 ff b9 7f 00 00 01 7f 00 ..<i@.@.........
0020 00 01 1f 4a 1b 62 00 b4 fe c7 80 00 e3 fe 15 2e ...J.b..........
0030 7f 10 6b 8b 45 67 ff ff ff ff ff ff ff ff ff ff ..k.Eg..........
0040 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
0050 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
0060 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
0070 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
0080 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
0090 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
00a0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
00b0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
00c0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
00d0 ff ff ff ff ff ff ......
Re tla fana ka sengoloa se latelang ho sekaseka tlhahisoleseling e thathamisitsoeng lethathamong lena mme re tla bua ka sebopeho sa kahare sa sephutheloana sa RTP.
Source: www.habr.com