X-Git-Url: http://git.eversberg.eu/gitweb.cgi?p=lcr.git;a=blobdiff_plain;f=gsm_bs.cpp;fp=gsm_bs.cpp;h=22ac70ce241ce4440c60d8b050b5353994cdcfae;hp=e25732aacc7c5ae00255af97e5f299676c35dd66;hb=da91d7d85fe092122e35ece52695f98345738359;hpb=2f5c3dc13063fc5e4cc4b72d2c3484be238c142e

diff --git a/gsm_bs.cpp b/gsm_bs.cpp
index e25732a..22ac70c 100644
--- a/gsm_bs.cpp
+++ b/gsm_bs.cpp
@@ -57,6 +57,34 @@ void generate_dtmf(void)
 
 
 /*
+ * 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)