Osmocom's Base Station Controller for 2G mobile networks https://osmocom.org/projects/osmobsc
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osmo-bsc/contrib/testconv/testconv_main.c

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2.9 KiB

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/application.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/mgcp.h>
#include <openbsc/mgcp_internal.h>
#include "bscconfig.h"
#ifndef BUILD_MGCP_TRANSCODING
#error "Requires MGCP transcoding enabled (see --enable-mgcp-transcoding)"
#endif
#include "openbsc/mgcp_transcode.h"
static int audio_name_to_type(const char *name)
{
if (!strcasecmp(name, "gsm"))
return 3;
#ifdef HAVE_BCG729
else if (!strcasecmp(name, "g729"))
return 18;
#endif
else if (!strcasecmp(name, "pcma"))
return 8;
else if (!strcasecmp(name, "l16"))
return 11;
return -1;
}
int mgcp_get_trans_frame_size(void *state_, int nsamples, int dst);
int main(int argc, char **argv)
{
char buf[4096] = {0x80, 0};
int cc, rc;
struct mgcp_rtp_end *dst_end;
struct mgcp_rtp_end *src_end;
struct mgcp_trunk_config tcfg = {{0}};
struct mgcp_endpoint endp = {0};
struct mgcp_process_rtp_state *state;
int in_size;
int in_samples = 160;
int out_samples = 0;
uint32_t ts = 0;
uint16_t seq = 0;
osmo_init_logging(&log_info);
tcfg.endpoints = &endp;
tcfg.number_endpoints = 1;
endp.tcfg = &tcfg;
mgcp_initialize_endp(&endp);
dst_end = &endp.bts_end;
src_end = &endp.net_end;
if (argc <= 2)
errx(1, "Usage: {gsm|g729|pcma|l16} {gsm|g729|pcma|l16} [SPP]");
if ((src_end->codec.payload_type = audio_name_to_type(argv[1])) == -1)
errx(1, "invalid input format '%s'", argv[1]);
if ((dst_end->codec.payload_type = audio_name_to_type(argv[2])) == -1)
errx(1, "invalid output format '%s'", argv[2]);
if (argc > 3)
out_samples = atoi(argv[3]);
if (out_samples) {
dst_end->codec.frame_duration_den = dst_end->codec.rate;
dst_end->codec.frame_duration_num = out_samples;
dst_end->frames_per_packet = 1;
}
rc = mgcp_transcoding_setup(&endp, dst_end, src_end);
if (rc < 0)
errx(1, "setup failed: %s", strerror(-rc));
state = dst_end->rtp_process_data;
OSMO_ASSERT(state != NULL);
in_size = mgcp_transcoding_get_frame_size(state, in_samples, 0);
OSMO_ASSERT(sizeof(buf) >= in_size + 12);
buf[1] = src_end->codec.payload_type;
*(uint16_t*)(buf+2) = htons(1);
*(uint32_t*)(buf+4) = htonl(0);
*(uint32_t*)(buf+8) = htonl(0xaabbccdd);
while ((cc = read(0, buf + 12, in_size))) {
int cont;
int len;
if (cc != in_size)
err(1, "read");
*(uint16_t*)(buf+2) = htonl(seq);
*(uint32_t*)(buf+4) = htonl(ts);
seq += 1;
ts += in_samples;
cc += 12; /* include RTP header */
len = cc;
do {
cont = mgcp_transcoding_process_rtp(&endp, dst_end,
buf, &len, sizeof(buf));
if (cont == -EAGAIN) {
fprintf(stderr, "Got EAGAIN\n");
break;
}
if (cont < 0)
errx(1, "processing failed: %s", strerror(-cont));
len -= 12; /* ignore RTP header */
if (write(1, buf + 12, len) != len)
err(1, "write");
len = cont;
} while (len > 0);
}
return 0;
}