diff options
author | Benny Prijono <bennylp@teluu.com> | 2008-02-01 14:59:19 +0000 |
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committer | Benny Prijono <bennylp@teluu.com> | 2008-02-01 14:59:19 +0000 |
commit | 2c40b8a0f65babd72f03113040da9ee6d69e8372 (patch) | |
tree | d81aa1e84061a618cbd86db65ba6774fa157f0ce /pjsip-apps/src/samples | |
parent | 76cb47831c9da447e70b1338e406b6f817c70945 (diff) |
Ticket #465: utility to read PCAP file and sample application to read RTP files from PCAP file, decode the payload, and write the PCM output to WAV file
git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@1765 74dad513-b988-da41-8d7b-12977e46ad98
Diffstat (limited to 'pjsip-apps/src/samples')
-rw-r--r-- | pjsip-apps/src/samples/pcaputil.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/pjsip-apps/src/samples/pcaputil.c b/pjsip-apps/src/samples/pcaputil.c new file mode 100644 index 00000000..83a7ead3 --- /dev/null +++ b/pjsip-apps/src/samples/pcaputil.c @@ -0,0 +1,361 @@ +/* $Id$ */ +/* + * Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <pjlib.h> +#include <pjlib-util.h> +#include <pjmedia.h> +#include <pjmedia-codec.h> + +static const char *USAGE = +"pcaputil [options] INPUT OUTPUT\n" +"\n" +" Convert captured RTP packets in PCAP file to WAV or stream it\n" +" to remote destination.\n" +"\n" +"INPUT is the PCAP file name/path\n" +"\n" +"Options to filter packets from PCAP file:\n" +" --src-ip=IP Only include packets from this source address\n" +" --dst-ip=IP Only include packets destined to this address\n" +" --src-port=port Only include packets from this source port number\n" +" --dst-port=port Only include packets destined to this port number\n" +"\n" +"Options for saving to WAV file:\n" +"" +" OUTPUT is WAV file: Set output to WAV file. The program will decode the\n" +" RTP contents to the specified WAV file using codec\n" +" that is available in PJMEDIA, and optionally decrypt\n" +" the content using the SRTP crypto and keys below.\n" +" --srtp-crypto=TAG, -c Set crypto to be used to decrypt SRTP packets. Valid\n" +" tags are: \n" +" AES_CM_128_HMAC_SHA1_80 \n" +" AES_CM_128_HMAC_SHA1_32\n" +" --srtp-key=KEY, -k Set the base64 key to decrypt SRTP packets.\n" +"\n" +" Example:\n" +" pcaputil file.pcap output.wav\n" +" pcaputil -c AES_CM_128_HMAC_SHA1_80 \\\n" +" -k VLDONbsbGl2Puqy+0PV7w/uGfpSPKFevDpxGsxN3 \\\n" +" file.pcap output.wav\n" +; + +static pj_caching_pool cp; +static pj_pool_t *pool; +static pjmedia_endpt *mept; +static pj_pcap_file *pcap; +static pjmedia_port *wav; +static pjmedia_transport *srtp; + +static void err_exit(const char *title, pj_status_t status) +{ + if (status != PJ_SUCCESS) { + char errmsg[PJ_ERR_MSG_SIZE]; + pj_strerror(status, errmsg, sizeof(errmsg)); + printf("Error: %s: %s\n", title, errmsg); + } else { + printf("Error: %s\n", title); + } + + if (srtp) pjmedia_transport_close(srtp); + if (wav) pjmedia_port_destroy(wav); + if (pcap) pj_pcap_close(pcap); + if (mept) pjmedia_endpt_destroy(mept); + if (pool) pj_pool_release(pool); + pj_caching_pool_destroy(&cp); + pj_shutdown(); + + exit(1); +} + +#define T(op) do { \ + status = op; \ + if (status != PJ_SUCCESS) \ + err_exit(#op, status); \ + } while (0) + + +static void read_rtp(pj_uint8_t *buf, pj_size_t bufsize, + pjmedia_rtp_hdr **rtp, + pj_uint8_t **payload, + unsigned *payload_size) +{ + pj_size_t sz = bufsize; + pj_status_t status; + + status = pj_pcap_read_udp(pcap, buf, &sz); + if (status != PJ_SUCCESS) + err_exit("Error reading PCAP file", status); + + if (sz < sizeof(pjmedia_rtp_hdr) + 10) { + err_exit("Invalid RTP packet", PJ_SUCCESS); + } + + /* Decrypt SRTP */ + if (srtp) { + int len = sz; + T(pjmedia_transport_srtp_decrypt_pkt(srtp, PJ_TRUE, buf, &len)); + sz = len; + } + + *rtp = (pjmedia_rtp_hdr*)buf; + *payload = (pj_uint8_t*) (buf + sizeof(pjmedia_rtp_hdr)); + *payload_size = sz - sizeof(pjmedia_rtp_hdr); +} + +static void pcap2wav(const char *wav_filename, const pj_str_t *srtp_crypto, + const pj_str_t *srtp_key) +{ + struct pkt + { + pj_uint8_t buffer[320]; + pjmedia_rtp_hdr *rtp; + pj_uint8_t *payload; + unsigned payload_len; + } pkt0; + pjmedia_codec_mgr *cmgr; + pjmedia_codec_info *ci; + pjmedia_codec_param param; + pjmedia_codec *codec; + unsigned samples_per_frame; + pj_status_t status; + + /* Initialize all codecs */ +#if PJMEDIA_HAS_SPEEX_CODEC + T( pjmedia_codec_speex_init(mept, 0, 10, 10) ); +#endif /* PJMEDIA_HAS_SPEEX_CODEC */ + +#if PJMEDIA_HAS_ILBC_CODEC + T( pjmedia_codec_ilbc_init(mept, 30) ); +#endif /* PJMEDIA_HAS_ILBC_CODEC */ + +#if PJMEDIA_HAS_GSM_CODEC + T( pjmedia_codec_gsm_init(mept) ); +#endif /* PJMEDIA_HAS_GSM_CODEC */ + +#if PJMEDIA_HAS_G711_CODEC + T( pjmedia_codec_g711_init(mept) ); +#endif /* PJMEDIA_HAS_G711_CODEC */ + +#if PJMEDIA_HAS_L16_CODEC + T( pjmedia_codec_l16_init(mept, 0) ); +#endif /* PJMEDIA_HAS_L16_CODEC */ + + /* Create SRTP transport is needed */ + if (srtp_crypto->slen) { + pjmedia_srtp_crypto crypto; + + pj_bzero(&crypto, sizeof(crypto)); + crypto.key = *srtp_key; + crypto.name = *srtp_crypto; + T( pjmedia_transport_srtp_create(mept, NULL, NULL, &srtp) ); + T( pjmedia_transport_srtp_start(srtp, &crypto, &crypto) ); + } + + /* Read first packet */ + read_rtp(pkt0.buffer, sizeof(pkt0.buffer), &pkt0.rtp, + &pkt0.payload, &pkt0.payload_len); + + cmgr = pjmedia_endpt_get_codec_mgr(mept); + + /* Get codec info and param for the specified payload type */ + T( pjmedia_codec_mgr_get_codec_info(cmgr, pkt0.rtp->pt, &ci) ); + T( pjmedia_codec_mgr_get_default_param(cmgr, ci, ¶m) ); + + /* Alloc and init codec */ + T( pjmedia_codec_mgr_alloc_codec(cmgr, ci, &codec) ); + T( codec->op->init(codec, pool) ); + T( codec->op->open(codec, ¶m) ); + + /* Open WAV file */ + samples_per_frame = ci->clock_rate * param.info.frm_ptime / 1000; + T( pjmedia_wav_writer_port_create(pool, wav_filename, + ci->clock_rate, ci->channel_cnt, + samples_per_frame, + param.info.pcm_bits_per_sample, 0, 0, + &wav) ); + + /* Loop reading PCAP and writing WAV file */ + for (;;) { + struct pkt pkt1; + pj_timestamp ts; + pjmedia_frame frames[16], pcm_frame; + short pcm[320]; + unsigned i, frame_cnt; + long samples_cnt, ts_gap; + + pj_assert(sizeof(pcm) >= samples_per_frame); + + /* Parse first packet */ + ts.u64 = 0; + frame_cnt = PJ_ARRAY_SIZE(frames); + T( codec->op->parse(codec, pkt0.payload, pkt0.payload_len, &ts, + &frame_cnt, frames) ); + + /* Decode and write to WAV file */ + samples_cnt = 0; + for (i=0; i<frame_cnt; ++i) { + pjmedia_frame pcm_frame; + + pcm_frame.buf = pcm; + pcm_frame.size = samples_per_frame * 2; + + T( codec->op->decode(codec, &frames[i], pcm_frame.size, &pcm_frame) ); + T( pjmedia_port_put_frame(wav, &pcm_frame) ); + samples_cnt += samples_per_frame; + } + + /* Read next packet */ + read_rtp(pkt1.buffer, sizeof(pkt1.buffer), &pkt1.rtp, + &pkt1.payload, &pkt1.payload_len); + + /* Fill in the gap (if any) between pkt0 and pkt1 */ + ts_gap = pj_ntohl(pkt1.rtp->ts) - pj_ntohl(pkt0.rtp->ts) - + samples_cnt; + while (ts_gap >= (long)samples_per_frame) { + + pcm_frame.buf = pcm; + pcm_frame.size = samples_per_frame * 2; + + if (codec->op->recover) { + T( codec->op->recover(codec, pcm_frame.size, &pcm_frame) ); + } else { + pj_bzero(pcm_frame.buf, pcm_frame.size); + } + + T( pjmedia_port_put_frame(wav, &pcm_frame) ); + ts_gap -= samples_per_frame; + } + + /* Next */ + pkt0 = pkt1; + pkt0.rtp = (pjmedia_rtp_hdr*)pkt0.buffer; + pkt0.payload = pkt0.buffer + (pkt1.payload - pkt1.buffer); + } +} + + +int main(int argc, char *argv[]) +{ + pj_str_t input, output, wav, srtp_crypto, srtp_key; + pj_pcap_filter filter; + pj_status_t status; + + enum { OPT_SRC_IP = 1, OPT_DST_IP, OPT_SRC_PORT, OPT_DST_PORT }; + struct pj_getopt_option long_options[] = { + { "srtp-crypto", 1, 0, 'c' }, + { "srtp-key", 1, 0, 'k' }, + { "src-ip", 1, 0, OPT_SRC_IP }, + { "dst-ip", 1, 0, OPT_DST_IP }, + { "src-port", 1, 0, OPT_SRC_PORT }, + { "dst-port", 1, 0, OPT_DST_PORT }, + { NULL, 0, 0, 0} + }; + int c; + int option_index; + char key_bin[32]; + + srtp_crypto.slen = srtp_key.slen = 0; + + pj_pcap_filter_default(&filter); + filter.link = PJ_PCAP_LINK_TYPE_ETH; + filter.proto = PJ_PCAP_PROTO_TYPE_UDP; + + /* Parse arguments */ + pj_optind = 0; + while((c=pj_getopt_long(argc,argv, "c:k:", long_options, &option_index))!=-1) { + switch (c) { + case 'c': + srtp_crypto = pj_str(pj_optarg); + break; + case 'k': + { + int key_len = sizeof(key_bin); + srtp_key = pj_str(pj_optarg); + if (pj_base64_decode(&srtp_key, (pj_uint8_t*)key_bin, &key_len)) { + puts("Error: invalid key"); + return 1; + } + srtp_key.ptr = key_bin; + srtp_key.slen = key_len; + } + break; + case OPT_SRC_IP: + { + pj_str_t t = pj_str(pj_optarg); + pj_in_addr a = pj_inet_addr(&t); + filter.ip_src = a.s_addr; + } + break; + case OPT_DST_IP: + { + pj_str_t t = pj_str(pj_optarg); + pj_in_addr a = pj_inet_addr(&t); + filter.ip_dst = a.s_addr; + } + break; + case OPT_SRC_PORT: + filter.src_port = pj_htons((pj_uint16_t)atoi(pj_optarg)); + break; + case OPT_DST_PORT: + filter.dst_port = pj_htons((pj_uint16_t)atoi(pj_optarg)); + break; + default: + puts("Error: invalid option"); + return 1; + } + } + + if (pj_optind != argc - 2) { + puts(USAGE); + return 1; + } + + if (!(srtp_crypto.slen) != !(srtp_key.slen)) { + puts("Error: both SRTP crypto and key must be specified"); + puts(USAGE); + return 1; + } + + input = pj_str(argv[pj_optind]); + output = pj_str(argv[pj_optind+1]); + wav = pj_str(".wav"); + + T( pj_init() ); + + pj_caching_pool_init(&cp, NULL, 0); + pool = pj_pool_create(&cp.factory, "pcaputil", 1000, 1000, NULL); + + T( pjlib_util_init() ); + T( pjmedia_endpt_create(&cp.factory, NULL, 0, &mept) ); + + T( pj_pcap_open(pool, input.ptr, &pcap) ); + T( pj_pcap_set_filter(pcap, &filter) ); + + if (pj_stristr(&output, &wav)) { + pcap2wav(output.ptr, &srtp_crypto, &srtp_key); + } else { + err_exit("invalid output file", PJ_EINVAL); + } + + pjmedia_endpt_destroy(mept); + pj_pool_release(pool); + pj_caching_pool_destroy(&cp); + pj_shutdown(); + return 0; +} + |