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agc tweaks

This commit is contained in:
Anthony Minessale 2011-02-20 14:37:23 -06:00
parent 78472897cd
commit 180e3d4ab1
3 changed files with 104 additions and 26 deletions
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9
src/include/switch_resample.h
View File

@ -39,6 +39,7 @@
*/
#define switch_normalize_volume(x) if (x > 4) x = 4; if (x < -4) x = -4;
#define switch_normalize_volume_granular(x) if (x > 12) x = 12; if (x < -12) x = -12;
#ifndef SWITCH_RESAMPLE_H
#define SWITCH_RESAMPLE_H
@ -158,6 +159,14 @@ SWITCH_DECLARE(void) switch_generate_sln_silence(int16_t *data, uint32_t samples
\param vol the volume factor -4 -> 4
*/
SWITCH_DECLARE(void) switch_change_sln_volume(int16_t *data, uint32_t samples, int32_t vol);
/*!
\brief Change the volume of a signed linear audio frame with more granularity
\param data the audio data
\param samples the number of 2 byte samples
\param vol the volume factor -12 -> 12
*/
SWITCH_DECLARE(void) switch_change_sln_volume_granular(int16_t *data, uint32_t samples, int32_t vol);
///\}
SWITCH_DECLARE(uint32_t) switch_merge_sln(int16_t *data, uint32_t samples, int16_t *other_data, uint32_t other_samples);

84
src/mod/applications/mod_conference/mod_conference.c
View File

@ -318,6 +318,7 @@ struct conference_member {
switch_mutex_t *audio_in_mutex;
switch_mutex_t *audio_out_mutex;
switch_mutex_t *read_mutex;
switch_codec_implementation_t read_impl;
switch_codec_implementation_t orig_read_impl;
switch_codec_t read_codec;
switch_codec_t write_codec;
@ -1942,14 +1943,37 @@ static void conference_loop_fn_hangup(conference_member_t *member, caller_contro
switch_clear_flag_locked(member, MFLAG_RUNNING);
}
static void check_agc_levels(conference_member_t *member)
{
if (!member->avg_score) return;
if (member->avg_score < member->conference->agc_level - 200) {
member->agc_volume_in_level++;
switch_normalize_volume_granular(member->agc_volume_in_level);
} else if (member->avg_score > member->conference->agc_level + 200) {
member->agc_volume_in_level--;
switch_normalize_volume_granular(member->agc_volume_in_level);
}
//} else {
//member->vol_period = (member->read_impl.actual_samples_per_second / member->read_impl.samples_per_packet) * 5;
//}
}
static void clear_avg(conference_member_t *member)
{
member->agc_volume_in_level = 0;
if (member->agc_volume_in_level < -5) {
member->agc_volume_in_level = 0;
}
if (member->conference->agc_level) {
check_agc_levels(member);
}
member->avg_score = 0;
member->avg_itt = 0;
member->avg_tally = 0;
member->nt_tally = 0;
member->agc_concur = 0;
}
@ -1962,7 +1986,6 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
switch_status_t status;
switch_frame_t *read_frame = NULL;
uint32_t hangover = 40, hangunder = 5, hangover_hits = 0, hangunder_hits = 0, energy_level = 0, diff_level = 400;
switch_codec_implementation_t read_impl = { 0 };
switch_core_session_t *session = member->session;
int check_floor_change;
@ -1972,7 +1995,7 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
channel = switch_core_session_get_channel(session);
switch_core_session_get_read_impl(session, &read_impl);
switch_core_session_get_read_impl(session, &member->read_impl);
/* As long as we have a valid read, feed that data into an input buffer where the conference thread will take it
and mux it with any audio from other channels. */
@ -1997,6 +2020,10 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
}
if (switch_test_flag(read_frame, SFF_CNG)) {
if (member->conference->agc_level) {
member->nt_tally++;
}
if (hangunder_hits) {
hangunder_hits--;
}
@ -2017,6 +2044,11 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
goto do_continue;
}
if (member->nt_tally > (member->read_impl.actual_samples_per_second / member->read_impl.samples_per_packet) * 3) {
member->agc_volume_in_level = 0;
clear_avg(member);
}
/* Check for input volume adjustments */
if (!member->conference->agc_level) {
@ -2031,30 +2063,29 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
uint32_t energy = 0, i = 0, samples = 0, j = 0;
int16_t *data;
int divisor = 0;
int agc_period = (read_impl.actual_samples_per_second / read_impl.samples_per_packet) / 2;
int combined_vol = 0;
int agc_period = (member->read_impl.actual_samples_per_second / member->read_impl.samples_per_packet) / 4;
data = read_frame->data;
if (!(divisor = read_impl.actual_samples_per_second / 8000)) {
if (!(divisor = member->read_impl.actual_samples_per_second / 8000)) {
divisor = 1;
}
member->score = 0;
combined_vol = member->agc_volume_in_level;
if (member->conference->agc_level) {
combined_vol += member->agc_volume_in_level;
if (member->volume_in_level) {
switch_change_sln_volume(read_frame->data, read_frame->datalen / 2, member->volume_in_level);
}
if (combined_vol) {
switch_change_sln_volume(read_frame->data, read_frame->datalen / 2, combined_vol);
if (member->agc_volume_in_level) {
switch_change_sln_volume_granular(read_frame->data, read_frame->datalen / 2, member->agc_volume_in_level);
}
if ((samples = read_frame->datalen / sizeof(*data))) {
for (i = 0; i < samples; i++) {
energy += abs(data[j]);
j += read_impl.number_of_channels;
j += member->read_impl.number_of_channels;
}
member->score = energy / (samples / divisor);
}
@ -2082,22 +2113,14 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
if (++member->nt_tally >= agc_period) {
if (++member->agc_concur >= agc_period) {
if (!member->vol_period) {
if (member->avg_score < member->conference->agc_level) {
member->agc_volume_in_level++;
switch_normalize_volume(member->agc_volume_in_level);
member->vol_period = (read_impl.actual_samples_per_second / read_impl.samples_per_packet) * 2;
}
if (member->avg_score > member->conference->agc_level) {
member->agc_volume_in_level--;
switch_normalize_volume(member->agc_volume_in_level);
member->vol_period = (read_impl.actual_samples_per_second / read_impl.samples_per_packet) * 2;
}
check_agc_levels(member);
}
member->nt_tally = 0;
member->agc_concur = 0;
}
} else {
member->nt_tally++;
}
member->score_iir = (int) (((1.0 - SCORE_DECAY) * (float) member->score) + (SCORE_DECAY * (float) member->score_iir));
@ -2112,6 +2135,10 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
hangover_hits--;
}
if (member->conference->agc_level) {
member->nt_tally = 0;
}
if (diff >= diff_level || ++hangunder_hits >= hangunder) {
check_floor_change = 1;
@ -2147,6 +2174,11 @@ static void *SWITCH_THREAD_FUNC conference_loop_input(switch_thread_t *thread, v
if (hangunder_hits) {
hangunder_hits--;
}
if (member->conference->agc_level) {
member->nt_tally++;
}
if (switch_test_flag(member, MFLAG_TALKING) && switch_test_flag(member, MFLAG_CAN_SPEAK)) {
switch_event_t *event;
if (++hangover_hits >= hangover) {

37
src/switch_resample.c
View File

@ -269,6 +269,43 @@ SWITCH_DECLARE(void) switch_mux_channels(int16_t *data, switch_size_t samples, u
}
SWITCH_DECLARE(void) switch_change_sln_volume_granular(int16_t *data, uint32_t samples, int32_t vol)
{
double newrate = 0;
double pos[12] = {1.25, 1.50, 1.75, 2.0, 2.25, 2.50, 2.75, 3.0, 3.25, 3.50, 3.75, 4.0};
double neg[12] = {.917, .834, .751, .668, .585, .502, .419, .336, .253, .017, .087, .004};
double *chart;
uint32_t i;
if (vol == 0) return;
switch_normalize_volume_granular(vol);
if (vol > 0) {
chart = pos;
} else {
chart = neg;
}
i = abs(vol) - 1;
switch_assert(i < 12);
newrate = chart[i];
if (newrate) {
int32_t tmp;
uint32_t x;
int16_t *fp = data;
for (x = 0; x < samples; x++) {
tmp = (int32_t) fp[x] * newrate;
switch_normalize_to_16bit(tmp);
fp[x] = (int16_t) tmp;
}
}
}
SWITCH_DECLARE(void) switch_change_sln_volume(int16_t *data, uint32_t samples, int32_t vol)
{
double newrate = 0;