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gain value adjustment fixes 

git-svn-id: http://svn.openzap.org/svn/openzap/branches/sangoma_boost@978 a93c3328-9c30-0410-af19-c9cd2b2d52af
This commit is contained in:
Moises Silva 2010-01-15 21:58:36 +00:00
parent ac7c608620
commit 4ef72cfef6
1 changed files with 18 additions and 3 deletions
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21
libs/freetdm/src/ftdm_io.c
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@ -608,15 +608,21 @@ static void reset_gain_table(unsigned char *gain_table, float new_gain, ftdm_cod
if (!new_gain) {
/* for a 0.0db gain table, each alaw/ulaw sample value is left untouched (0 ==0, 1 == 1, 2 == 2 etc)*/
for (sv = 0; sv < FTDM_GAINS_TABLE_SIZE; sv++) {
sv = 0;
while (1) {
gain_table[sv] = sv;
if (sv == (FTDM_GAINS_TABLE_SIZE-1)) {
break;
}
sv++;
}
return;
}
/* use the 20log rule to increase the gain: http://en.wikipedia.org/wiki/Gain, http:/en.wipedia.org/wiki/20_log_rule#Definitions */
lingain = (float)pow(10.0, new_gain/ 20.0);
for (sv = 0; sv < FTDM_GAINS_TABLE_SIZE; sv++) {
sv = 0;
while (1) {
/* get the linear value for this alaw/ulaw sample value */
linvalue = codec_gain == FTDM_CODEC_ALAW ? (float)alaw_to_linear(sv) : (float)ulaw_to_linear(sv);
@ -632,6 +638,10 @@ static void reset_gain_table(unsigned char *gain_table, float new_gain, ftdm_cod
ampvalue = FTDM_SLINEAR_MIN_VALUE;
}
gain_table[sv] = codec_gain == FTDM_CODEC_ALAW ? linear_to_alaw(ampvalue) : linear_to_ulaw(ampvalue);
if (sv == (FTDM_GAINS_TABLE_SIZE-1)) {
break;
}
sv++;
}
}
@ -675,9 +685,14 @@ FT_DECLARE(ftdm_status_t) ftdm_span_add_channel(ftdm_span_t *span, ftdm_socket_t
new_chan->dtmf_hangup_buf = ftdm_calloc (span->dtmf_hangup_len + 1, sizeof (char));
/* set 0.0db gain table */
for (i = 0; i < sizeof(new_chan->txgain_table); i++) {
i = 0;
while (1) {
new_chan->txgain_table[i] = i;
new_chan->rxgain_table[i] = i;
if (i == (sizeof(new_chan->txgain_table)-1)) {
break;
}
i++;
}
ftdm_set_flag(new_chan, FTDM_CHANNEL_CONFIGURED | FTDM_CHANNEL_READY);