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adaptive and fixed codebook vector operations for ACELP-based codecs
Originally committed as revision 13244 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vladimir Voroshilov
parent
4a13a2d4f7
commit
5b2729cd0b
147
libavcodec/acelp_vectors.c
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147
libavcodec/acelp_vectors.c
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/*
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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_indices,
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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_indices & mask]] +=
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(pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
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pulse_indices >>= bits;
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pulse_signs >>= 1;
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}
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fc_v[tab2[pulse_indices]] += (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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151
libavcodec/acelp_vectors.h
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151
libavcodec/acelp_vectors.h
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@ -0,0 +1,151 @@
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/*
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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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#ifndef FFMPEG_ACELP_VECTORS_H
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#define FFMPEG_ACELP_VECTORS_H
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/*
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* Track|Pulse| Positions
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* -------------------------------------------------------------------------
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* 1 | 0 | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75
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* -------------------------------------------------------------------------
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* 2 | 1 | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76
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* -------------------------------------------------------------------------
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* 3 | 2 | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77
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* -------------------------------------------------------------------------
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*
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* Table contains only first the pulse indexes.
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*
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* Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
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*/
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extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16];
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/*
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* Track|Pulse| Positions
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* -------------------------------------------------------------------------
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* 4 | 3 | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78
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* | | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79
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* -------------------------------------------------------------------------
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*
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* \remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
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*/
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extern const uint8_t ff_fc_4pulses_8bits_track_4[32];
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/*
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* Track|Pulse| Positions
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* -----------------------------------------
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* 1 | 0 | 1, 6, 11, 16, 21, 26, 31, 36
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* | | 3, 8, 13, 18, 23, 28, 33, 38
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* -----------------------------------------
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*
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* \remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* \note (EE) Reference G.729D code also uses gray decoding for each
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* pulse index before looking up the value in the table.
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*
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* Used in G.729 @6.4k (with gray coding), AMD @5.9k (without gray coding)
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*/
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extern const uint8_t ff_fc_2pulses_9bits_track1[16];
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extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16];
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/*
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* Track|Pulse| Positions
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* -----------------------------------------
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* 2 | 1 | 0, 7, 14, 20, 27, 34, 1, 21
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* | | 2, 9, 15, 22, 29, 35, 6, 26
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* | | 4,10, 17, 24, 30, 37, 11, 31
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* | | 5,12, 19, 25, 32, 39, 16, 36
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* -----------------------------------------
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*
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* \remark Track in the table should be read top-to-bottom, left-to-right.
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*
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* \note (EE.1) This table (from the reference code) does not comply with
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* the specification.
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* The specification contains the following table:
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*
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* Track|Pulse| Positions
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* -----------------------------------------
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* 2 | 1 | 0, 5, 10, 15, 20, 25, 30, 35
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* | | 1, 6, 11, 16, 21, 26, 31, 36
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* | | 2, 7, 12, 17, 22, 27, 32, 37
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* | | 4, 9, 14, 19, 24, 29, 34, 39
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*
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* -----------------------------------------
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*
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* \note (EE.2) Reference G.729D code also uses gray decoding for each
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* pulse index before looking up the value in the table.
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*
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* Used in G.729 @6.4k (with gray coding)
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*/
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extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32];
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/**
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* \brief Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
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* \param fc_v [out] decoded fixed codebook vector (2.13)
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* \param tab1 table used for first pulse_count pulses
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* \param tab2 table used for last pulse
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* \param pulse_indices fixed codebook indeces
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* \param pulse_signs signs of the excitation pulses (0 bit value
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* means negative sign)
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* \param bits number of bits per one pulse index
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* \param pulse_count number of pulses decoded using first table
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* \param bits length of one pulse index in bits
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*
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* Used in G.729 @8k, G.729 @4.4k, G.729 @6.4k, AMR @7.95k, AMR @7.40k
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*/
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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_indices,
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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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* \brief weighted sum of two vectors with rounding
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* \param out [out] result of addition
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* \param in_a first vector
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* \param in_b second vector
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* \param weight_coeff_a first vector weight coefficient
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* \param weight_coeff_a second vector weight coefficient
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* \param rounder this value will be added to the sum of the two vectors
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* \param shift result will be shifted to right by this value
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* \param length vectors length
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*
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* \note It is safe to pass the same buffer for out and in_a or in_b.
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*
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* out[i] = (in_a[i]*weight_a+in_b[i]*weight_b+rounder) >> shift
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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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#endif // FFMPEG_ACELP_VECTORS_H
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