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/*
* OpenR2
* MFC/R2 call setup library
*
* Moises Silva <moy@sangoma.com>
* Copyright (C) 2009 Moises Silva
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* compile with gcc dtmf_detect.c -o dtmf_detect.exe -lspandsp */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <spandsp.h>
#define FORMAT_INVALID 0
#define FORMAT_ALAW 1
#define FORMAT_SLINEAR 2
#define CHUNK_SAMPLES 160
#define USAGE "USAGE: %s [alaw|slinear] [alaw or slinear file path]\n"
static void on_dtmf_detected(void *usrdata, const char *digits, int len)
{
printf("Detected %s\n", digits);
}
int main(int argc, char *argv[])
{
struct stat statbuf;
FILE *audiofp;
short slinear_buffer[CHUNK_SAMPLES];
char alaw_buffer[CHUNK_SAMPLES];
char *chunk_buffer;
size_t chunksize = 0;
int format = FORMAT_INVALID;
int i = 0;
char digit = 0;
char currdigit = 0;
dtmf_rx_state_t *rxstate = NULL;
printf("Running DTMF Detection Test - alaw or slinear 8000hz only\n");
if (argc < 3) {
fprintf(stderr, USAGE, argv[0]);
exit(1);
}
if (!strncasecmp(argv[1], "alaw", sizeof("alaw")-1)) {
format = FORMAT_ALAW;
chunksize = sizeof(alaw_buffer);
chunk_buffer = alaw_buffer;
} else if (!strncasecmp(argv[1], "slinear", sizeof("slinear")-1)) {
format = FORMAT_SLINEAR;
chunksize = sizeof(slinear_buffer);
chunk_buffer = (char *)slinear_buffer;
} else {
fprintf(stderr, USAGE, argv[0]);
exit(1);
}
printf("Using file %s\n", argv[2]);
if (stat(argv[2], &statbuf)) {
perror("could not stat audio file");
exit(1);
}
audiofp = fopen(argv[2], "r");
if (!audiofp) {
perror("could not open audio file");
exit(1);
}
rxstate = dtmf_rx_init(rxstate, on_dtmf_detected, NULL);
printf("reading chunks of %d bytes\n", chunksize);
while (fread(chunk_buffer, chunksize, 1, audiofp) == 1) {
if (format == FORMAT_ALAW) {
/* chunksize == bytes == samples */
for (i = 0; i < chunksize; i++) {
slinear_buffer[i] = alaw_to_linear(chunk_buffer[i]);
}
}
dtmf_rx(rxstate, slinear_buffer, CHUNK_SAMPLES);
digit = dtmf_rx_status(rxstate);
if (digit) {
currdigit = digit;
printf("%c ON\n", currdigit);
} else if (currdigit) {
printf("%c OFF\n", currdigit);
currdigit = 0;
}
}
dtmf_rx_free(rxstate);
fclose(audiofp);
return 0;
}
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