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148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
/*
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* adaptive and fixed codebook vector operations for ACELP-based codecs
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*
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* Copyright (c) 2008 Vladimir Voroshilov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "avcodec.h"
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#include "acelp_vectors.h"
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const uint8_t ff_fc_2pulses_9bits_track1[16] =
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{
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1, 3,
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6, 8,
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11, 13,
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16, 18,
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21, 23,
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26, 28,
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31, 33,
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36, 38
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};
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const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
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{
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1, 3,
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8, 6,
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18, 16,
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11, 13,
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38, 36,
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31, 33,
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21, 23,
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28, 26,
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};
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const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
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{
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0, 2,
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5, 4,
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12, 10,
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7, 9,
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25, 24,
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20, 22,
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14, 15,
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19, 17,
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36, 31,
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21, 26,
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1, 6,
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16, 11,
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27, 29,
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32, 30,
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39, 37,
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34, 35,
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};
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const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
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{
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0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
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};
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const uint8_t ff_fc_4pulses_8bits_track_4[32] =
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{
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3, 4,
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8, 9,
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13, 14,
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18, 19,
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23, 24,
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28, 29,
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33, 34,
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38, 39,
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43, 44,
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48, 49,
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53, 54,
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58, 59,
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63, 64,
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68, 69,
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73, 74,
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78, 79,
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};
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#if 0
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static uint8_t gray_decode[32] =
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{
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0, 1, 3, 2, 7, 6, 4, 5,
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15, 14, 12, 13, 8, 9, 11, 10,
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31, 30, 28, 29, 24, 25, 27, 26,
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16, 17, 19, 18, 23, 22, 20, 21
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};
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#endif
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void ff_acelp_fc_pulse_per_track(
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int16_t* fc_v,
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const uint8_t *tab1,
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const uint8_t *tab2,
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int pulse_indexes,
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int pulse_signs,
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int pulse_count,
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int bits)
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{
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int mask = (1 << bits) - 1;
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int i;
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for(i=0; i<pulse_count; i++)
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{
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fc_v[i + tab1[pulse_indexes & mask]] +=
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(pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
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pulse_indexes >>= bits;
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pulse_signs >>= 1;
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}
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fc_v[tab2[pulse_indexes]] += (pulse_signs & 1) ? 8191 : -8192;
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}
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void ff_acelp_weighted_vector_sum(
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int16_t* out,
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const int16_t *in_a,
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const int16_t *in_b,
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int16_t weight_coeff_a,
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int16_t weight_coeff_b,
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int16_t rounder,
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int shift,
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int length)
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{
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int i;
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// Clipping required here; breaks OVERFLOW test.
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for(i=0; i<length; i++)
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out[i] = av_clip_int16((
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in_a[i] * weight_coeff_a +
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in_b[i] * weight_coeff_b +
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rounder) >> shift);
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}
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