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Binaural synthesis (confbridge): Adds binaural synthesis to bridge_softmix.

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Adds binaural synthesis to bridge_softmix (via convolution using libfftw3).
Binaural synthesis is conducted at 48kHz.
For a conference, only one spatial representation is rendered.
The default rendering is applied for mono-capable channels.

ASTERISK-26292

Change-Id: Iecdb381b6adc17c961049658678f6219adae1ddf
This commit is contained in:
frahaase
2016-08-12 18:23:18 +02:00
committed by George Joseph
parent 9ad1df71b3
commit 094c26aa68
21 changed files with 52186 additions and 178 deletions
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53
utils/conf_bridge_binaural_hrir_importer.c
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@@ -1,7 +1,7 @@
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2016, Digium, Inc.
* Copyright (C) 2016, Frank Haase, Dennis Guse
*
* Frank Haase <fra.haase@gmail.com>
* Dennis Guse <dennis.guse@alumni.tu-berlin.de>
@@ -30,6 +30,7 @@
#include <string.h>
#include <stdlib.h>
#include <sndfile.h>
#include "conf_bridge_binaural_hrir_importer.h"
int main (int argc, char **argv)
{
@@ -99,46 +100,44 @@ int main (int argc, char **argv)
impulse_response_index_end = (binaural_index_end + 1) * 2;
/* Write header */
printf("//Used hrirs database: %s\n", hrir_filename);
printf("//Start index in database: %d\n", impulse_response_index_start);
printf("//End index in database: %d\n", impulse_response_index_end);
printf(FILE_HEADER, hrir_filename, binaural_index_start, binaural_index_end);
printf("#define HRIRS_IMPULSE_LEN %ld\n", hrir_info.frames);
printf("#define HRIRS_IMPULSE_SIZE %d\n", binaural_index_end - binaural_index_start + 1);
printf("#define HRIRS_SAMPLE_RATE %d\n", hrir_info.samplerate);
printf("#define HRIRS_SAMPLE_RATE %d\n\n", hrir_info.samplerate);
printf("float hrirs_left[HRIRS_IMPULSE_SIZE][HRIRS_IMPULSE_LEN] = {\n");
for (ir_current = impulse_response_index_start; ir_current < impulse_response_index_end; ir_current += 2) {
printf("{");
printf("{");
for (j = 0; j < hrir_info.frames - 1; j++) {
printf("%.16f,", hrir_data[ir_current * hrir_info.frames + j]);
}
/* Write last without trailing "," */
printf("%.16f", hrir_data[ir_current * hrir_info.frames + hrir_info.frames - 1]);
for (j = 0; j < hrir_info.frames - 1; j++) {
printf("%.16f,%s", hrir_data[ir_current * hrir_info.frames + j], ((j + 1) % 4 ? " " : "\n"));
}
/* Write last without trailing "," */
printf("%.16f", hrir_data[ir_current * hrir_info.frames + hrir_info.frames - 1]);
if (ir_current + 2 < impulse_response_index_end) {
printf("},\n");
} else {
printf("}};");
}
if (ir_current + 2 < impulse_response_index_end) {
printf("},\n");
} else {
printf("}};");
}
}
printf("\nfloat hrirs_right[HRIRS_IMPULSE_SIZE][HRIRS_IMPULSE_LEN] = {\n");
for (ir_current = impulse_response_index_start + 1; ir_current < impulse_response_index_end + 1; ir_current += 2) {
printf("{");
printf("{");
for (j = 0; j < hrir_info.frames - 1; j++) {
printf("%.16f,", hrir_data[ir_current * hrir_info.frames + j]);
}
/* Write last without trailing "," */
printf("%.16f", hrir_data[ir_current * hrir_info.frames + hrir_info.frames - 1]);
for (j = 0; j < hrir_info.frames - 1; j++) {
printf("%.16f,%s", hrir_data[ir_current * hrir_info.frames + j], ((j + 1) % 4 ? " " : "\n"));
}
/* Write last without trailing "," */
printf("%.16f", hrir_data[ir_current * hrir_info.frames + hrir_info.frames - 1]);
if (ir_current + 2 < impulse_response_index_end) {
printf("},\n");
} else {
printf("}};");
}
if (ir_current + 2 < impulse_response_index_end) {
printf("},\n");
} else {
printf("}};");
}
}
fprintf(stderr, "INFO: Successfully converted: imported %d impulse responses.\n", impulse_response_index_end - impulse_response_index_start);