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264 lines
9.4 KiB
264 lines
9.4 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 AVCODEC_ACELP_VECTORS_H |
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#define AVCODEC_ACELP_VECTORS_H |
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#include <stdint.h> |
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/** Sparse representation for the algebraic codebook (fixed) vector */ |
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typedef struct { |
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int n; |
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int x[10]; |
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float y[10]; |
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int no_repeat_mask; |
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int pitch_lag; |
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float pitch_fac; |
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} AMRFixed; |
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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), AMR @@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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* b60 hamming windowed sinc function coefficients |
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*/ |
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extern const float ff_b60_sinc[61]; |
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/** |
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* Table of pow(0.7,n) |
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*/ |
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extern const float ff_pow_0_7[10]; |
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/** |
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* Table of pow(0.75,n) |
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*/ |
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extern const float ff_pow_0_75[10]; |
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/** |
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* Table of pow(0.55,n) |
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*/ |
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extern const float ff_pow_0_55[10]; |
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/** |
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* Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR). |
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* @param[out] fc_v 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_indexes fixed codebook indexes |
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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(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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* Decode the algebraic codebook index to pulse positions and signs and |
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* construct the algebraic codebook vector for MODE_12k2. |
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* |
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* @note: The positions and signs are explicitly coded in MODE_12k2. |
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* |
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* @param fixed_index positions of the ten pulses |
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* @param fixed_sparse pointer to the algebraic codebook vector |
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* @param gray_decode gray decoding table |
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* @param half_pulse_count number of couples of pulses |
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* @param bits length of one pulse index in bits |
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*/ |
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void ff_decode_10_pulses_35bits(const int16_t *fixed_index, |
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AMRFixed *fixed_sparse, |
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const uint8_t *gray_decode, |
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int half_pulse_count, int bits); |
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/** |
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* 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(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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* float implementation of weighted sum of two vectors. |
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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 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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void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b, |
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float weight_coeff_a, float weight_coeff_b, |
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int length); |
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/** |
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* Adaptive gain control (as used in AMR postfiltering) |
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* |
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* @param out output buffer for filtered speech data |
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* @param in the input speech buffer (may be the same as out) |
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* @param speech_energ input energy |
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* @param size the input buffer size |
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* @param alpha exponential filter factor |
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* @param gain_mem a pointer to the filter memory (single float of size) |
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*/ |
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void ff_adaptive_gain_control(float *out, const float *in, float speech_energ, |
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int size, float alpha, float *gain_mem); |
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/** |
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* Set the sum of squares of a signal by scaling |
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* |
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* @param out output samples |
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* @param in input samples |
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* @param sum_of_squares new sum of squares |
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* @param n number of samples |
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* |
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* @note If the input is zero (or its energy underflows), the output is zero. |
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* This is the behavior of AGC in the AMR reference decoder. The QCELP |
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* reference decoder seems to have undefined behavior. |
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* |
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* TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6 |
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* 3GPP TS 26.090 6.1 (6) |
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*/ |
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void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in, |
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float sum_of_squares, const int n); |
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/** |
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* Add fixed vector to an array from a sparse representation |
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* |
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* @param out fixed vector with pitch sharpening |
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* @param in sparse fixed vector |
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* @param scale number to multiply the fixed vector by |
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* @param size the output vector size |
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*/ |
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void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size); |
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/** |
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* Clear array values set by set_fixed_vector |
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* |
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* @param out fixed vector to be cleared |
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* @param in sparse fixed vector |
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* @param size the output vector size |
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*/ |
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void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size); |
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#endif /* AVCODEC_ACELP_VECTORS_H */
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