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gstreamer/subprojects/gst-plugins-bad/gst/siren/common.c

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/*
* Siren Encoder/Decoder library
*
* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "siren7.h"
int region_size;
float region_size_inverse;
float standard_deviation[64];
float deviation_inverse[64];
float region_power_table_boundary[63];
int expected_bits_table[8] = { 52, 47, 43, 37, 29, 22, 16, 0 };
int vector_dimension[8] = { 2, 2, 2, 4, 4, 5, 5, 1 };
int number_of_vectors[8] = { 10, 10, 10, 5, 5, 4, 4, 20 };
float dead_zone[8] = { 0.3f, 0.33f, 0.36f, 0.39f, 0.42f, 0.45f, 0.5f, 0.5f };
int max_bin[8] = {
13,
9,
6,
4,
3,
2,
1,
1
};
float step_size[8] = {
0.3536f,
0.5f,
0.70709997f,
1.0f,
1.4141999f,
2.0f,
2.8283999f,
2.8283999f
};
float step_size_inverse[8];
static int siren_initialized = 0;
/*
STEPSIZE = 2.0 * log(sqrt(2));
*/
#define STEPSIZE 0.3010299957f
void
siren_init (void)
{
int i;
float region_power;
if (siren_initialized == 1)
return;
region_size = 20;
region_size_inverse = 1.0f / region_size;
for (i = 0; i < 64; i++) {
region_power = powf (10.0f, (i - 24) * STEPSIZE);
standard_deviation[i] = sqrtf (region_power);
deviation_inverse[i] = 1.0f / standard_deviation[i];
}
for (i = 0; i < 63; i++)
region_power_table_boundary[i] =
(float) pow (10, (i - 24 + 0.5) * STEPSIZE);
for (i = 0; i < 8; i++)
step_size_inverse[i] = (float) 1.0 / step_size[i];
siren_dct4_init ();
siren_rmlt_init ();
siren_initialized = 1;
}
int
categorize_regions (int number_of_regions, int number_of_available_bits,
int *absolute_region_power_index, int *power_categories,
int *category_balance)
{
int region, delta, i, temp;
int expected_number_of_code_bits;
int min, max;
int offset,
num_rate_control_possibilities,
raw_value, raw_max_idx = 0, raw_min_idx = 0;
int max_rate_categories[28];
int min_rate_categories[28];
int temp_category_balances[64];
int *min_rate_ptr = NULL;
int *max_rate_ptr = NULL;
if (number_of_regions == 14) {
num_rate_control_possibilities = 16;
if (number_of_available_bits > 320)
number_of_available_bits =
((number_of_available_bits - 320) * 5 / 8) + 320;
} else {
num_rate_control_possibilities = 32;
if (number_of_regions == 28 && number_of_available_bits > 640)
number_of_available_bits =
((number_of_available_bits - 640) * 5 / 8) + 640;
}
offset = -32;
for (delta = 32; number_of_regions > 0 && delta > 0; delta /= 2) {
expected_number_of_code_bits = 0;
for (region = 0; region < number_of_regions; region++) {
i = (delta + offset - absolute_region_power_index[region]) >> 1;
if (i > 7)
i = 7;
else if (i < 0)
i = 0;
power_categories[region] = i;
expected_number_of_code_bits += expected_bits_table[i];
}
if (expected_number_of_code_bits >= number_of_available_bits - 32)
offset += delta;
}
expected_number_of_code_bits = 0;
for (region = 0; region < number_of_regions; region++) {
i = (offset - absolute_region_power_index[region]) >> 1;
if (i > 7)
i = 7;
else if (i < 0)
i = 0;
max_rate_categories[region] = min_rate_categories[region] =
power_categories[region] = i;
expected_number_of_code_bits += expected_bits_table[i];
}
min = max = expected_number_of_code_bits;
min_rate_ptr = max_rate_ptr =
temp_category_balances + num_rate_control_possibilities;
for (i = 0; i < num_rate_control_possibilities - 1; i++) {
if (min + max > number_of_available_bits * 2) {
raw_value = -99;
for (region = number_of_regions - 1; region >= 0; region--) {
if (min_rate_categories[region] < 7) {
temp =
offset - absolute_region_power_index[region] -
2 * min_rate_categories[region];
if (temp > raw_value) {
raw_value = temp;
raw_min_idx = region;
}
}
}
*min_rate_ptr++ = raw_min_idx;
min +=
expected_bits_table[min_rate_categories[raw_min_idx] + 1] -
expected_bits_table[min_rate_categories[raw_min_idx]];
min_rate_categories[raw_min_idx]++;
} else {
raw_value = 99;
for (region = 0; region < number_of_regions; region++) {
if (max_rate_categories[region] > 0) {
temp =
offset - absolute_region_power_index[region] -
2 * max_rate_categories[region];
if (temp < raw_value) {
raw_value = temp;
raw_max_idx = region;
}
}
}
*--max_rate_ptr = raw_max_idx;
max +=
expected_bits_table[max_rate_categories[raw_max_idx] - 1] -
expected_bits_table[max_rate_categories[raw_max_idx]];
max_rate_categories[raw_max_idx]--;
}
}
for (region = 0; region < number_of_regions; region++)
power_categories[region] = max_rate_categories[region];
for (i = 0; i < num_rate_control_possibilities - 1; i++)
category_balance[i] = *max_rate_ptr++;
return 0;
}
/*
Looks like the flag means what kind of encoding is used
for now, it looks like :
0 : the sample rate is not encoded in the frame
1 - 2 : the sample rate is fixed in the frame
3 : sample rate is variable and there is one for each frame
*/
int
GetSirenCodecInfo (int flag, int sample_rate, int *number_of_coefs,
int *sample_rate_bits, int *rate_control_bits,
int *rate_control_possibilities, int *checksum_bits, int *esf_adjustment,
int *scale_factor, int *number_of_regions, int *sample_rate_code,
int *bits_per_frame)
{
switch (flag) {
case 0:
*number_of_coefs = 320;
*sample_rate_bits = 0;
*rate_control_bits = 4;
*rate_control_possibilities = 16;
*checksum_bits = 0;
*esf_adjustment = 7;
*number_of_regions = 14;
*sample_rate_code = 0;
*scale_factor = 22;
break;
case 1:
*number_of_coefs = 320;
*sample_rate_bits = 2;
*rate_control_bits = 4;
*rate_control_possibilities = 16;
*checksum_bits = 4;
*esf_adjustment = -2;
*number_of_regions = 14;
*scale_factor = 1;
if (sample_rate == 16000)
*sample_rate_code = 1;
else if (sample_rate == 24000)
*sample_rate_code = 2;
else if (sample_rate == 32000)
*sample_rate_code = 3;
else
return 3;
break;
case 2:
*number_of_coefs = 640;
*sample_rate_bits = 2;
*rate_control_bits = 5;
*rate_control_possibilities = 32;
*checksum_bits = 4;
*esf_adjustment = 7;
*number_of_regions = 28;
*scale_factor = 33;
if (sample_rate == 24000)
*sample_rate_code = 1;
else if (sample_rate == 32000)
*sample_rate_code = 2;
else if (sample_rate == 48000)
*sample_rate_code = 3;
else
return 3;
break;
case 3:
*number_of_coefs = 640;
*sample_rate_bits = 6;
*rate_control_bits = 5;
*rate_control_possibilities = 32;
*checksum_bits = 4;
*esf_adjustment = 7;
*scale_factor = 33;
switch (sample_rate) {
case 8800:
*number_of_regions = 12;
*sample_rate_code = 59;
break;
case 9600:
*number_of_regions = 12;
*sample_rate_code = 1;
break;
case 10400:
*number_of_regions = 12;
*sample_rate_code = 13;
break;
case 10800:
*number_of_regions = 12;
*sample_rate_code = 14;
break;
case 11200:
*number_of_regions = 12;
*sample_rate_code = 15;
break;
case 11600:
*number_of_regions = 12;
*sample_rate_code = 16;
break;
case 12000:
*number_of_regions = 12;
*sample_rate_code = 2;
break;
case 12400:
*number_of_regions = 12;
*sample_rate_code = 17;
break;
case 12800:
*number_of_regions = 12;
*sample_rate_code = 18;
break;
case 13200:
*number_of_regions = 12;
*sample_rate_code = 19;
break;
case 13600:
*number_of_regions = 12;
*sample_rate_code = 20;
break;
case 14000:
*number_of_regions = 12;
*sample_rate_code = 21;
break;
case 14400:
*number_of_regions = 16;
*sample_rate_code = 3;
break;
case 14800:
*number_of_regions = 16;
*sample_rate_code = 22;
break;
case 15200:
*number_of_regions = 16;
*sample_rate_code = 23;
break;
case 15600:
*number_of_regions = 16;
*sample_rate_code = 24;
break;
case 16000:
*number_of_regions = 16;
*sample_rate_code = 25;
break;
case 16400:
*number_of_regions = 16;
*sample_rate_code = 26;
break;
case 16800:
*number_of_regions = 18;
*sample_rate_code = 4;
break;
case 17200:
*number_of_regions = 18;
*sample_rate_code = 27;
break;
case 17600:
*number_of_regions = 18;
*sample_rate_code = 28;
break;
case 18000:
*number_of_regions = 18;
*sample_rate_code = 29;
break;
case 18400:
*number_of_regions = 18;
*sample_rate_code = 30;
break;
case 18800:
*number_of_regions = 18;
*sample_rate_code = 31;
break;
case 19200:
*number_of_regions = 20;
*sample_rate_code = 5;
break;
case 19600:
*number_of_regions = 20;
*sample_rate_code = 32;
break;
case 20000:
*number_of_regions = 20;
*sample_rate_code = 33;
break;
case 20400:
*number_of_regions = 20;
*sample_rate_code = 34;
break;
case 20800:
*number_of_regions = 20;
*sample_rate_code = 35;
break;
case 21200:
*number_of_regions = 20;
*sample_rate_code = 36;
break;
case 21600:
*number_of_regions = 22;
*sample_rate_code = 6;
break;
case 22000:
*number_of_regions = 22;
*sample_rate_code = 37;
break;
case 22400:
*number_of_regions = 22;
*sample_rate_code = 38;
break;
case 22800:
*number_of_regions = 22;
*sample_rate_code = 39;
break;
case 23200:
*number_of_regions = 22;
*sample_rate_code = 40;
break;
case 23600:
*number_of_regions = 22;
*sample_rate_code = 41;
break;
case 24000:
*number_of_regions = 24;
*sample_rate_code = 7;
break;
case 24400:
*number_of_regions = 24;
*sample_rate_code = 42;
break;
case 24800:
*number_of_regions = 24;
*sample_rate_code = 43;
break;
case 25200:
*number_of_regions = 24;
*sample_rate_code = 44;
break;
case 25600:
*number_of_regions = 24;
*sample_rate_code = 45;
break;
case 26000:
*number_of_regions = 24;
*sample_rate_code = 46;
break;
case 26400:
*number_of_regions = 26;
*sample_rate_code = 8;
break;
case 26800:
*number_of_regions = 26;
*sample_rate_code = 47;
break;
case 27200:
*number_of_regions = 26;
*sample_rate_code = 48;
break;
case 27600:
*number_of_regions = 26;
*sample_rate_code = 49;
break;
case 28000:
*number_of_regions = 26;
*sample_rate_code = 50;
break;
case 28400:
*number_of_regions = 26;
*sample_rate_code = 51;
break;
case 28800:
*number_of_regions = 28;
*sample_rate_code = 9;
break;
case 29200:
*number_of_regions = 28;
*sample_rate_code = 52;
break;
case 29600:
*number_of_regions = 28;
*sample_rate_code = 53;
break;
case 30000:
*number_of_regions = 28;
*sample_rate_code = 54;
break;
case 30400:
*number_of_regions = 28;
*sample_rate_code = 55;
break;
case 30800:
*number_of_regions = 28;
*sample_rate_code = 56;
break;
case 31200:
*number_of_regions = 28;
*sample_rate_code = 10;
break;
case 31600:
*number_of_regions = 28;
*sample_rate_code = 57;
break;
case 32000:
*number_of_regions = 28;
*sample_rate_code = 58;
break;
default:
return 3;
break;
}
break;
default:
return 6;
}
*bits_per_frame = sample_rate / 50;
return 0;
}
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