mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 13244 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Vladimir Voroshilov
17 years ago
parent
4a13a2d4f7
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5b2729cd0b
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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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@ -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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