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[GSM_BS] Added DTMF support.

This commit is contained in:
Andreas Eversberg 2011-02-20 10:35:40 +01:00
parent df0d71f05b
commit 129a76d141
3 changed files with 84 additions and 4 deletions
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83
gsm_bs.cpp
View File

@ -85,12 +85,43 @@ static void db_sync_timer_cb(void *data)
bsc_schedule_timer(&db_sync_timer, DB_SYNC_INTERVAL);
}
/*
* DTMF stuff
*/
unsigned char dtmf_samples[16][8000];
static int dtmf_x[4] = { 1209, 1336, 1477, 1633 };
static int dtmf_y[4] = { 697, 770, 852, 941 };
void generate_dtmf(void)
{
double fx, fy, sample;
int i, x, y;
unsigned char *law;
for (y = 0; y < 4; y++) {
fy = 2 * 3.1415927 * ((double)dtmf_y[y]) / 8000.0;
for (x = 0; x < 4; x++) {
fx = 2 * 3.1415927 * ((double)dtmf_x[x]) / 8000.0;
law = dtmf_samples[y << 2 | x];
for (i = 0; i < 8000; i++) {
sample = sin(fy * ((double)i)) * 0.251 * 32767.0; /* -6 dB */
sample += sin(fx * ((double)i)) * 0.158 * 32767.0; /* -8 dB */
*law++ = audio_s16_to_law[(int)sample & 0xffff];
}
}
}
}
/*
* constructor
*/
Pgsm_bs::Pgsm_bs(int type, struct mISDNport *mISDNport, char *portname, struct port_settings *settings, int channel, int exclusive, int mode) : Pgsm(type, mISDNport, portname, settings, channel, exclusive, mode)
{
p_m_g_instance = gsm->network;
p_m_g_dtmf = NULL;
p_m_g_dtmf_index = 0;
PDEBUG(DEBUG_GSM, "Created new GSMBSPort(%s).\n", portname);
}
@ -105,7 +136,7 @@ Pgsm_bs::~Pgsm_bs()
/* DTMF INDICATION */
void Pgsm_bs::start_dtmf_ind(unsigned int msg_type, unsigned int callref, struct gsm_mncc *mncc)
{
struct lcr_msg *message;
// struct lcr_msg *message;
struct gsm_mncc *resp;
gsm_trace_header(p_m_mISDNport, this, msg_type, DIRECTION_IN);
@ -122,10 +153,37 @@ void Pgsm_bs::start_dtmf_ind(unsigned int msg_type, unsigned int callref, struct
resp->keypad = mncc->keypad;
send_and_free_mncc(p_m_g_instance, resp->msg_type, resp);
#if 0
/* send dialing information */
message = message_create(p_serial, ACTIVE_EPOINT(p_epointlist), PORT_TO_EPOINT, MESSAGE_INFORMATION);
memcpy(&message->param.information, &p_dialinginfo, sizeof(struct dialing_info));
message_put(message);
#endif
/* generate DTMF tones */
switch (mncc->keypad) {
case '1': p_m_g_dtmf = dtmf_samples[0]; break;
case '2': p_m_g_dtmf = dtmf_samples[1]; break;
case '3': p_m_g_dtmf = dtmf_samples[2]; break;
case 'a':
case 'A': p_m_g_dtmf = dtmf_samples[3]; break;
case '4': p_m_g_dtmf = dtmf_samples[4]; break;
case '5': p_m_g_dtmf = dtmf_samples[5]; break;
case '6': p_m_g_dtmf = dtmf_samples[6]; break;
case 'b':
case 'B': p_m_g_dtmf = dtmf_samples[7]; break;
case '7': p_m_g_dtmf = dtmf_samples[8]; break;
case '8': p_m_g_dtmf = dtmf_samples[9]; break;
case '9': p_m_g_dtmf = dtmf_samples[10]; break;
case 'c':
case 'C': p_m_g_dtmf = dtmf_samples[11]; break;
case '*': p_m_g_dtmf = dtmf_samples[12]; break;
case '0': p_m_g_dtmf = dtmf_samples[13]; break;
case '#': p_m_g_dtmf = dtmf_samples[14]; break;
case 'd':
case 'D': p_m_g_dtmf = dtmf_samples[15]; break;
}
p_m_g_dtmf_index = 0;
}
void Pgsm_bs::stop_dtmf_ind(unsigned int msg_type, unsigned int callref, struct gsm_mncc *mncc)
{
@ -142,6 +200,9 @@ void Pgsm_bs::stop_dtmf_ind(unsigned int msg_type, unsigned int callref, struct
resp = create_mncc(MNCC_STOP_DTMF_RSP, p_m_g_callref);
resp->keypad = mncc->keypad;
send_and_free_mncc(p_m_g_instance, resp->msg_type, resp);
/* stop DTMF */
p_m_g_dtmf = NULL;
}
/* HOLD INDICATION */
@ -435,8 +496,22 @@ static int message_bsc(struct gsm_network *net, int msg_type, void *arg)
}
if (msg_type == GSM_TCHF_FRAME) {
if (port)
pgsm_bs->frame_receive(arg);
if (port) {
/* inject DTMF, if enabled */
if (pgsm_bs->p_m_g_dtmf) {
unsigned char data[160];
int i;
for (i = 0; i < 160; i++) {
data[i] = pgsm_bs->p_m_g_dtmf[pgsm_bs->p_m_g_dtmf_index++];
if (pgsm_bs->p_m_g_dtmf_index == 8000)
pgsm_bs->p_m_g_dtmf_index = 0;
}
/* send */
pgsm_bs->bchannel_send(PH_DATA_REQ, 0, data, 160);
} else
pgsm_bs->frame_receive(arg);
}
return 0;
}
@ -860,6 +935,8 @@ int gsm_bs_init(void)
db_sync_timer.data = NULL;
bsc_schedule_timer(&db_sync_timer, DB_SYNC_INTERVAL);
generate_dtmf();
return 0;
}

3
gsm_bs.h
View File

@ -9,6 +9,9 @@ class Pgsm_bs : public Pgsm
Pgsm_bs(int type, struct mISDNport *mISDNport, char *portname, struct port_settings *settings, int channel, int exclusive, int mode);
~Pgsm_bs();
unsigned char *p_m_g_dtmf; /* DTMF tone generation (MS only) */
int p_m_g_dtmf_index; /* DTMF tone generation index */
void setup_ind(unsigned int msg_type, unsigned int callref, struct gsm_mncc *mncc);
void start_dtmf_ind(unsigned int msg_type, unsigned int callref, struct gsm_mncc *mncc);
void stop_dtmf_ind(unsigned int msg_type, unsigned int callref, struct gsm_mncc *mncc);

2
main.c
View File

@ -364,7 +364,7 @@ int main(int argc, char *argv[])
}
#if defined WITH_GSM_BS || defined WITH_GSM_MS
/* handle gsm */
/* init gsm */
if (options.gsm && gsm_init()) {
fprintf(stderr, "GSM initialization failed.\n");
goto free;