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429 lines
11 KiB
C
429 lines
11 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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#include "huffman_consts.h"
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static short current_word = 0;
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static int bit_idx = 0;
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static int *bitstream_ptr = NULL;
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int
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next_bit (void)
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{
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if (bitstream_ptr == NULL)
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return -1;
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if (bit_idx == 0) {
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current_word = *bitstream_ptr++;
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bit_idx = 16;
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}
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return (current_word >> --bit_idx) & 1;
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}
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void
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set_bitstream (int *stream)
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{
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bitstream_ptr = stream;
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current_word = *bitstream_ptr;
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bit_idx = 0;
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}
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int
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compute_region_powers (int number_of_regions, float *coefs, int *drp_num_bits,
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int *drp_code_bits, int *absolute_region_power_index, int esf_adjustment)
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{
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float region_power = 0;
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int num_bits;
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int idx;
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int max_idx, min_idx;
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int region, i;
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for (region = 0; region < number_of_regions; region++) {
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region_power = 0.0f;
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for (i = 0; i < region_size; i++) {
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region_power +=
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coefs[(region * region_size) + i] * coefs[(region * region_size) + i];
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}
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region_power *= region_size_inverse;
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min_idx = 0;
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max_idx = 64;
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for (i = 0; i < 6; i++) {
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idx = (min_idx + max_idx) / 2;
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if (region_power_table_boundary[idx - 1] <= region_power) {
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min_idx = idx;
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} else {
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max_idx = idx;
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}
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}
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absolute_region_power_index[region] = min_idx - 24;
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}
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for (region = number_of_regions - 2; region >= 0; region--) {
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if (absolute_region_power_index[region] <
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absolute_region_power_index[region + 1] - 11)
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absolute_region_power_index[region] =
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absolute_region_power_index[region + 1] - 11;
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}
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if (absolute_region_power_index[0] < (1 - esf_adjustment))
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absolute_region_power_index[0] = (1 - esf_adjustment);
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if (absolute_region_power_index[0] > (31 - esf_adjustment))
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absolute_region_power_index[0] = (31 - esf_adjustment);
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drp_num_bits[0] = 5;
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drp_code_bits[0] = absolute_region_power_index[0] + esf_adjustment;
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for (region = 1; region < number_of_regions; region++) {
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if (absolute_region_power_index[region] < (-8 - esf_adjustment))
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absolute_region_power_index[region] = (-8 - esf_adjustment);
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if (absolute_region_power_index[region] > (31 - esf_adjustment))
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absolute_region_power_index[region] = (31 - esf_adjustment);
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}
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num_bits = 5;
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for (region = 0; region < number_of_regions - 1; region++) {
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idx =
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absolute_region_power_index[region + 1] -
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absolute_region_power_index[region] + 12;
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if (idx < 0)
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idx = 0;
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absolute_region_power_index[region + 1] =
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absolute_region_power_index[region] + idx - 12;
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drp_num_bits[region + 1] = differential_region_power_bits[region][idx];
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drp_code_bits[region + 1] = differential_region_power_codes[region][idx];
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num_bits += drp_num_bits[region + 1];
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}
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return num_bits;
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}
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int
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decode_envelope (int number_of_regions, float *decoder_standard_deviation,
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int *absolute_region_power_index, int esf_adjustment)
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{
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int index;
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int i;
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int envelope_bits = 0;
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index = 0;
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for (i = 0; i < 5; i++)
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index = (index << 1) | next_bit ();
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envelope_bits = 5;
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absolute_region_power_index[0] = index - esf_adjustment;
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decoder_standard_deviation[0] =
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standard_deviation[absolute_region_power_index[0] + 24];
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for (i = 1; i < number_of_regions; i++) {
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index = 0;
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do {
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index = differential_decoder_tree[i - 1][index][next_bit ()];
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envelope_bits++;
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} while (index > 0);
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absolute_region_power_index[i] =
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absolute_region_power_index[i - 1] - index - 12;
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decoder_standard_deviation[i] =
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standard_deviation[absolute_region_power_index[i] + 24];
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}
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return envelope_bits;
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}
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static int
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huffman_vector (int category, int power_idx, float *mlts, int *out)
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{
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int i, j;
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float temp_value = deviation_inverse[power_idx] * step_size_inverse[category];
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int sign_idx, idx, non_zeroes, max, bits_available;
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int current_word = 0;
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int region_bits = 0;
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bits_available = 32;
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for (i = 0; i < number_of_vectors[category]; i++) {
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sign_idx = idx = non_zeroes = 0;
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for (j = 0; j < vector_dimension[category]; j++) {
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max = (int) ((fabs (*mlts) * temp_value) + dead_zone[category]);
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if (max != 0) {
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sign_idx <<= 1;
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non_zeroes++;
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if (*mlts > 0)
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sign_idx++;
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if (max > max_bin[category] || max < 0)
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max = max_bin[category];
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}
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mlts++;
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idx = (idx * (max_bin[category] + 1)) + max;
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}
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region_bits += bitcount_tables[category][idx] + non_zeroes;
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bits_available -= bitcount_tables[category][idx] + non_zeroes;
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if (bits_available < 0) {
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*out++ =
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current_word + (((code_tables[category][idx] << non_zeroes) +
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sign_idx) >> -bits_available);
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bits_available += 32;
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current_word =
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((code_tables[category][idx] << non_zeroes) +
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sign_idx) << bits_available;
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} else {
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current_word +=
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((code_tables[category][idx] << non_zeroes) +
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sign_idx) << bits_available;
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}
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}
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*out = current_word;
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return region_bits;
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}
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int
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quantize_mlt (int number_of_regions, int rate_control_possibilities,
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int number_of_available_bits, float *coefs,
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int *absolute_region_power_index, int *power_categories,
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int *category_balance, int *region_mlt_bit_counts, int *region_mlt_bits)
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{
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int region;
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int mlt_bits = 0;
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int rate_control;
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for (rate_control = 0; rate_control < ((rate_control_possibilities >> 1) - 1);
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rate_control++)
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power_categories[category_balance[rate_control]]++;
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for (region = 0; region < number_of_regions; region++) {
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if (power_categories[region] > 6)
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region_mlt_bit_counts[region] = 0;
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else
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region_mlt_bit_counts[region] =
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huffman_vector (power_categories[region],
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absolute_region_power_index[region], coefs + (region_size * region),
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region_mlt_bits + (4 * region));
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mlt_bits += region_mlt_bit_counts[region];
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}
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while (mlt_bits < number_of_available_bits && rate_control > 0) {
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rate_control--;
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region = category_balance[rate_control];
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power_categories[region]--;
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if (power_categories[region] < 0)
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power_categories[region] = 0;
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mlt_bits -= region_mlt_bit_counts[region];
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if (power_categories[region] > 6)
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region_mlt_bit_counts[region] = 0;
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else
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region_mlt_bit_counts[region] =
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huffman_vector (power_categories[region],
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absolute_region_power_index[region], coefs + (region_size * region),
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region_mlt_bits + (4 * region));
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mlt_bits += region_mlt_bit_counts[region];
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}
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while (mlt_bits > number_of_available_bits
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&& rate_control < rate_control_possibilities) {
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region = category_balance[rate_control];
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power_categories[region]++;
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mlt_bits -= region_mlt_bit_counts[region];
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if (power_categories[region] > 6)
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region_mlt_bit_counts[region] = 0;
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else
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region_mlt_bit_counts[region] =
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huffman_vector (power_categories[region],
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absolute_region_power_index[region], coefs + (region_size * region),
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region_mlt_bits + (4 * region));
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mlt_bits += region_mlt_bit_counts[region];
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rate_control++;
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}
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return rate_control;
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}
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static int
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get_dw (SirenDecoder decoder)
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{
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int ret = decoder->dw1 + decoder->dw4;
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if ((ret & 0x8000) != 0)
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ret++;
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decoder->dw1 = decoder->dw2;
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decoder->dw2 = decoder->dw3;
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decoder->dw3 = decoder->dw4;
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decoder->dw4 = ret;
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return ret;
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}
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int
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decode_vector (SirenDecoder decoder, int number_of_regions,
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int number_of_available_bits, float *decoder_standard_deviation,
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int *power_categories, float *coefs, int scale_factor)
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{
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float *coefs_ptr;
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float decoded_value;
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float noise;
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int *decoder_tree;
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int region;
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int category;
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int i, j;
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int index;
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int error;
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int dw1;
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int dw2;
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error = 0;
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for (region = 0; region < number_of_regions; region++) {
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category = power_categories[region];
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coefs_ptr = coefs + (region * region_size);
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if (category < 7) {
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decoder_tree = decoder_tables[category];
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for (i = 0; i < number_of_vectors[category]; i++) {
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index = 0;
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do {
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if (number_of_available_bits <= 0) {
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error = 1;
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break;
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}
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index = decoder_tree[index + next_bit ()];
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number_of_available_bits--;
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} while ((index & 1) == 0);
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index >>= 1;
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if (error == 0 && number_of_available_bits >= 0) {
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for (j = 0; j < vector_dimension[category]; j++) {
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decoded_value =
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mlt_quant[category][index & ((1 << index_table[category]) - 1)];
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index >>= index_table[category];
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if (decoded_value != 0) {
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if (next_bit () == 0)
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decoded_value *= -decoder_standard_deviation[region];
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else
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decoded_value *= decoder_standard_deviation[region];
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number_of_available_bits--;
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}
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*coefs_ptr++ = decoded_value * scale_factor;
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}
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} else {
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error = 1;
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break;
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}
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}
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if (error == 1) {
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for (j = region + 1; j < number_of_regions; j++)
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power_categories[j] = 7;
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category = 7;
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}
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}
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coefs_ptr = coefs + (region * region_size);
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if (category == 5) {
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i = 0;
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for (j = 0; j < region_size; j++) {
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if (*coefs_ptr != 0) {
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i++;
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if (fabs (*coefs_ptr) > 2.0 * decoder_standard_deviation[region]) {
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i += 3;
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}
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}
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coefs_ptr++;
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}
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noise = decoder_standard_deviation[region] * noise_category5[i];
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} else if (category == 6) {
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i = 0;
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for (j = 0; j < region_size; j++) {
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if (*coefs_ptr++ != 0)
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i++;
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}
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noise = decoder_standard_deviation[region] * noise_category6[i];
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} else if (category == 7) {
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noise = decoder_standard_deviation[region] * noise_category7;
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} else {
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noise = 0;
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}
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coefs_ptr = coefs + (region * region_size);
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if (category == 5 || category == 6 || category == 7) {
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dw1 = get_dw (decoder);
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dw2 = get_dw (decoder);
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for (j = 0; j < 10; j++) {
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if (category == 7 || *coefs_ptr == 0) {
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if ((dw1 & 1))
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*coefs_ptr = noise;
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else
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*coefs_ptr = -noise;
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}
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coefs_ptr++;
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dw1 >>= 1;
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if (category == 7 || *coefs_ptr == 0) {
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if ((dw2 & 1))
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*coefs_ptr = noise;
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else
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*coefs_ptr = -noise;
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}
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coefs_ptr++;
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dw2 >>= 1;
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}
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}
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}
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return error == 1 ? -1 : number_of_available_bits;
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}
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