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505 lines
14 KiB
C
505 lines
14 KiB
C
/*
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* Siren Encoder/Decoder library
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*
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* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "siren7.h"
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int region_size;
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float region_size_inverse;
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float standard_deviation[64];
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float deviation_inverse[64];
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float region_power_table_boundary[63];
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int expected_bits_table[8] = {52, 47, 43, 37, 29, 22, 16, 0};
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int vector_dimension[8] = {2, 2, 2, 4, 4, 5, 5, 1};
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int number_of_vectors[8] = {10, 10, 10, 5, 5, 4, 4, 20};
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float dead_zone[8] = {0.3f, 0.33f, 0.36f, 0.39f, 0.42f, 0.45f, 0.5f, 0.5f};
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int max_bin[8] = {
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13,
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9,
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6,
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4,
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3,
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2,
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1,
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1};
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float step_size[8] = {
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0.3536f,
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0.5f,
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0.70709997f,
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1.0f,
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1.4141999f,
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2.0f,
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2.8283999f,
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2.8283999f};
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float step_size_inverse[8];
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static int siren_initialized = 0;
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/*
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STEPSIZE = 2.0 * log(sqrt(2));
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*/
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#define STEPSIZE 0.3010299957
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void siren_init() {
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int i;
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float region_power;
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if (siren_initialized == 1)
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return;
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region_size = 20;
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region_size_inverse = 1.0f/region_size;
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for (i = 0; i < 64; i++) {
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region_power = (float) pow(10, (i-24) * STEPSIZE);
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standard_deviation[i] = (float) sqrt(region_power);
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deviation_inverse[i] = (float) 1.0 / standard_deviation[i];
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}
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for (i = 0; i < 63; i++)
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region_power_table_boundary[i] = (float) pow(10, (i-24 + 0.5) * STEPSIZE);
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for (i = 0; i < 8; i++)
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step_size_inverse[i] = (float) 1.0 / step_size[i];
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siren_dct4_init();
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siren_rmlt_init();
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siren_initialized = 1;
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}
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int categorize_regions(int number_of_regions, int number_of_available_bits, int *absolute_region_power_index, int *power_categories, int *category_balance) {
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int region, delta, i, temp;
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int expected_number_of_code_bits;
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int min, max;
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int offset,
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num_rate_control_possibilities,
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raw_value,
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raw_max_idx = 0,
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raw_min_idx = 0;
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int max_rate_categories[28];
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int min_rate_categories[28];
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int temp_category_balances[64];
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int *min_rate_ptr = NULL;
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int *max_rate_ptr = NULL;
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if (number_of_regions == 14) {
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num_rate_control_possibilities = 16;
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if ( number_of_available_bits > 320)
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number_of_available_bits = ((number_of_available_bits - 320) * 5/8) + 320;
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} else {
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num_rate_control_possibilities = 32;
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if (number_of_regions == 28 && number_of_available_bits > 640)
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number_of_available_bits = ((number_of_available_bits - 640) * 5/8) + 640;
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}
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offset = -32;
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for (delta = 32; number_of_regions > 0 && delta > 0; delta /= 2) {
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expected_number_of_code_bits = 0;
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for (region = 0; region < number_of_regions; region++) {
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i = (delta + offset - absolute_region_power_index[region]) >> 1;
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if (i > 7)
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i = 7;
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else if (i < 0)
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i = 0;
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power_categories[region] = i;
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expected_number_of_code_bits += expected_bits_table[i];
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}
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if (expected_number_of_code_bits >= number_of_available_bits-32)
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offset += delta;
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}
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expected_number_of_code_bits = 0;
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for (region = 0; region < number_of_regions; region++) {
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i = (offset - absolute_region_power_index[region]) >> 1;
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if (i > 7)
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i = 7;
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else if (i < 0)
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i = 0;
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max_rate_categories[region] = min_rate_categories[region] = power_categories[region] = i;
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expected_number_of_code_bits += expected_bits_table[i];
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}
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min = max = expected_number_of_code_bits;
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min_rate_ptr = max_rate_ptr = temp_category_balances + num_rate_control_possibilities;
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for (i = 0; i < num_rate_control_possibilities -1; i++) {
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if (min + max > number_of_available_bits * 2) {
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raw_value = -99;
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for (region = number_of_regions-1; region >= 0; region--) {
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if (min_rate_categories[region] < 7) {
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temp = offset - absolute_region_power_index[region] - 2*min_rate_categories[region];
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if (temp > raw_value) {
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raw_value = temp;
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raw_min_idx = region;
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}
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}
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}
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*min_rate_ptr++ = raw_min_idx;
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min += expected_bits_table[min_rate_categories[raw_min_idx] + 1] - expected_bits_table[min_rate_categories[raw_min_idx]];
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min_rate_categories[raw_min_idx]++;
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} else {
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raw_value = 99;
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for (region = 0; region < number_of_regions; region++) {
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if (max_rate_categories[region] > 0 ) {
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temp = offset - absolute_region_power_index[region] - 2*max_rate_categories[region];
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if (temp < raw_value) {
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raw_value = temp;
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raw_max_idx = region;
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}
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}
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}
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*--max_rate_ptr = raw_max_idx;
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max += expected_bits_table[max_rate_categories[raw_max_idx] - 1] - expected_bits_table[max_rate_categories[raw_max_idx]];
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max_rate_categories[raw_max_idx]--;
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}
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}
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for (region = 0; region < number_of_regions; region++)
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power_categories[region] = max_rate_categories[region];
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for (i = 0; i < num_rate_control_possibilities-1; i++)
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category_balance[i] = *max_rate_ptr++;
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return 0;
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}
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/*
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Looks like the flag means what kind of encoding is used
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for now, it looks like :
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0 : the sample rate is not encoded in the frame
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1 - 2 : the sample rate is fixed in the frame
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3 : sample rate is variable and there is one for each frame
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*/
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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 ) {
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switch (flag) {
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case 0:
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*number_of_coefs = 320;
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*sample_rate_bits = 0;
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*rate_control_bits = 4;
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*rate_control_possibilities = 16;
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*checksum_bits = 0;
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*esf_adjustment = 7;
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*number_of_regions = 14;
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*sample_rate_code = 0;
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*scale_factor = 22;
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break;
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case 1:
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*number_of_coefs = 320;
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*sample_rate_bits = 2;
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*rate_control_bits = 4;
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*rate_control_possibilities = 16;
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*checksum_bits = 4;
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*esf_adjustment = -2;
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*number_of_regions = 14;
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*scale_factor = 1;
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if (sample_rate == 16000)
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*sample_rate_code = 1;
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else if (sample_rate == 24000)
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*sample_rate_code = 2;
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else if (sample_rate == 32000)
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*sample_rate_code = 3;
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else
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return 3;
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break;
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case 2:
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*number_of_coefs = 640;
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*sample_rate_bits = 2;
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*rate_control_bits = 5;
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*rate_control_possibilities = 32;
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*checksum_bits = 4;
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*esf_adjustment = 7;
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*number_of_regions = 28;
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*scale_factor = 33;
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if (sample_rate == 24000)
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*sample_rate_code = 1;
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else if (sample_rate == 24000)
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*sample_rate_code = 2;
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else if (sample_rate == 48000)
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*sample_rate_code = 3;
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else
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return 3;
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break;
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case 3:
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*number_of_coefs = 640;
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*sample_rate_bits = 6;
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*rate_control_bits = 5;
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*rate_control_possibilities = 32;
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*checksum_bits = 4;
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*esf_adjustment = 7;
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*scale_factor = 33;
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switch (sample_rate) {
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case 8800:
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*number_of_regions = 12;
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*sample_rate_code = 59;
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break;
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case 9600:
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*number_of_regions = 12;
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*sample_rate_code = 1;
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break;
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case 10400:
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*number_of_regions = 12;
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*sample_rate_code = 13;
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break;
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case 10800:
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*number_of_regions = 12;
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*sample_rate_code = 14;
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break;
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case 11200:
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*number_of_regions = 12;
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*sample_rate_code = 15;
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break;
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case 11600:
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*number_of_regions = 12;
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*sample_rate_code = 16;
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break;
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case 12000:
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*number_of_regions = 12;
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*sample_rate_code = 2;
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break;
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case 12400:
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*number_of_regions = 12;
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*sample_rate_code = 17;
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break;
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case 12800:
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*number_of_regions = 12;
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*sample_rate_code = 18;
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break;
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case 13200:
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*number_of_regions = 12;
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*sample_rate_code = 19;
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break;
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case 13600:
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*number_of_regions = 12;
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*sample_rate_code = 20;
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break;
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case 14000:
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*number_of_regions = 12;
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*sample_rate_code = 21;
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break;
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case 14400:
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*number_of_regions = 16;
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*sample_rate_code = 3;
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break;
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case 14800:
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*number_of_regions = 16;
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*sample_rate_code = 22;
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break;
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case 15200:
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*number_of_regions = 16;
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*sample_rate_code = 23;
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break;
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case 15600:
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*number_of_regions = 16;
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*sample_rate_code = 24;
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break;
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case 16000:
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*number_of_regions = 16;
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*sample_rate_code = 25;
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break;
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case 16400:
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*number_of_regions = 16;
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*sample_rate_code = 26;
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break;
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case 16800:
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*number_of_regions = 18;
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*sample_rate_code = 4;
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break;
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case 17200:
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*number_of_regions = 18;
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*sample_rate_code = 27;
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break;
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case 17600:
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*number_of_regions = 18;
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*sample_rate_code = 28;
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break;
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case 18000:
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*number_of_regions = 18;
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*sample_rate_code = 29;
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break;
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case 18400:
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*number_of_regions = 18;
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*sample_rate_code = 30;
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break;
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case 18800:
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*number_of_regions = 18;
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*sample_rate_code = 31;
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break;
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case 19200:
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*number_of_regions = 20;
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*sample_rate_code = 5;
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break;
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case 19600:
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*number_of_regions = 20;
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*sample_rate_code = 32;
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break;
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case 20000:
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*number_of_regions = 20;
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*sample_rate_code = 33;
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break;
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case 20400:
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*number_of_regions = 20;
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*sample_rate_code = 34;
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break;
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case 20800:
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*number_of_regions = 20;
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*sample_rate_code = 35;
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break;
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case 21200:
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*number_of_regions = 20;
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*sample_rate_code = 36;
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break;
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case 21600:
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*number_of_regions = 22;
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*sample_rate_code = 6;
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break;
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case 22000:
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*number_of_regions = 22;
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*sample_rate_code = 37;
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break;
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case 22400:
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*number_of_regions = 22;
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*sample_rate_code = 38;
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break;
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case 22800:
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*number_of_regions = 22;
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*sample_rate_code = 39;
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break;
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case 23200:
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*number_of_regions = 22;
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*sample_rate_code = 40;
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break;
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case 23600:
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*number_of_regions = 22;
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*sample_rate_code = 41;
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break;
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case 24000:
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*number_of_regions = 24;
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*sample_rate_code = 7;
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break;
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case 24400:
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*number_of_regions = 24;
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*sample_rate_code = 42;
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break;
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case 24800:
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*number_of_regions = 24;
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*sample_rate_code = 43;
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break;
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case 25200:
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*number_of_regions = 24;
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*sample_rate_code = 44;
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break;
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case 25600:
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*number_of_regions = 24;
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*sample_rate_code = 45;
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break;
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case 26000:
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*number_of_regions = 24;
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*sample_rate_code = 46;
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break;
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case 26400:
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*number_of_regions = 26;
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*sample_rate_code = 8;
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break;
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case 26800:
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*number_of_regions = 26;
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*sample_rate_code = 47;
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break;
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case 27200:
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*number_of_regions = 26;
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*sample_rate_code = 48;
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break;
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case 27600:
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*number_of_regions = 26;
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*sample_rate_code = 49;
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break;
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case 28000:
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*number_of_regions = 26;
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*sample_rate_code = 50;
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break;
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case 28400:
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*number_of_regions = 26;
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*sample_rate_code = 51;
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break;
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case 28800:
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*number_of_regions = 28;
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*sample_rate_code = 9;
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break;
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case 29200:
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*number_of_regions = 28;
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*sample_rate_code = 52;
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break;
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case 29600:
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*number_of_regions = 28;
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*sample_rate_code = 53;
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break;
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case 30000:
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*number_of_regions = 28;
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*sample_rate_code = 54;
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break;
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case 30400:
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*number_of_regions = 28;
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*sample_rate_code = 55;
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break;
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case 30800:
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*number_of_regions = 28;
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*sample_rate_code = 56;
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break;
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case 31200:
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*number_of_regions = 28;
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*sample_rate_code = 10;
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break;
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case 31600:
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*number_of_regions = 28;
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*sample_rate_code = 57;
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break;
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case 32000:
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*number_of_regions = 28;
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*sample_rate_code = 58;
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break;
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default:
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return 3;
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break;
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}
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break;
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default:
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return 6;
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}
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*bits_per_frame = sample_rate / 50;
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return 0;
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}
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