| /* |
| * adaptive and fixed codebook vector operations for ACELP-based codecs |
| * |
| * Copyright (c) 2008 Vladimir Voroshilov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_ACELP_VECTORS_H |
| #define AVCODEC_ACELP_VECTORS_H |
| |
| #include <stdint.h> |
| |
| typedef struct ACELPVContext { |
| /** |
| * float implementation of weighted sum of two vectors. |
| * @param[out] out result of addition |
| * @param in_a first vector |
| * @param in_b second vector |
| * @param weight_coeff_a first vector weight coefficient |
| * @param weight_coeff_a second vector weight coefficient |
| * @param length vectors length (should be a multiple of two) |
| * |
| * @note It is safe to pass the same buffer for out and in_a or in_b. |
| */ |
| void (*weighted_vector_sumf)(float *out, const float *in_a, const float *in_b, |
| float weight_coeff_a, float weight_coeff_b, |
| int length); |
| |
| }ACELPVContext; |
| |
| /** |
| * Initialize ACELPVContext. |
| */ |
| void ff_acelp_vectors_init(ACELPVContext *c); |
| void ff_acelp_vectors_init_mips(ACELPVContext *c); |
| |
| /** Sparse representation for the algebraic codebook (fixed) vector */ |
| typedef struct AMRFixed { |
| int n; |
| int x[10]; |
| float y[10]; |
| int no_repeat_mask; |
| int pitch_lag; |
| float pitch_fac; |
| } AMRFixed; |
| |
| /** |
| * Track|Pulse| Positions |
| * ------------------------------------------------------------------------- |
| * 1 | 0 | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 |
| * ------------------------------------------------------------------------- |
| * 2 | 1 | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76 |
| * ------------------------------------------------------------------------- |
| * 3 | 2 | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77 |
| * ------------------------------------------------------------------------- |
| * |
| * Table contains only first the pulse indexes. |
| * |
| * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k |
| */ |
| extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16]; |
| |
| /** |
| * Track|Pulse| Positions |
| * ------------------------------------------------------------------------- |
| * 4 | 3 | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78 |
| * | | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79 |
| * ------------------------------------------------------------------------- |
| * |
| * @remark Track in the table should be read top-to-bottom, left-to-right. |
| * |
| * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k |
| */ |
| extern const uint8_t ff_fc_4pulses_8bits_track_4[32]; |
| |
| /** |
| * Track|Pulse| Positions |
| * ----------------------------------------- |
| * 1 | 0 | 1, 6, 11, 16, 21, 26, 31, 36 |
| * | | 3, 8, 13, 18, 23, 28, 33, 38 |
| * ----------------------------------------- |
| * |
| * @remark Track in the table should be read top-to-bottom, left-to-right. |
| * |
| * @note (EE) Reference G.729D code also uses gray decoding for each |
| * pulse index before looking up the value in the table. |
| * |
| * Used in G.729 @@6.4k (with gray coding), AMR @@5.9k (without gray coding) |
| */ |
| extern const uint8_t ff_fc_2pulses_9bits_track1[16]; |
| extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16]; |
| |
| /** |
| * Track|Pulse| Positions |
| * ----------------------------------------- |
| * 2 | 1 | 0, 7, 14, 20, 27, 34, 1, 21 |
| * | | 2, 9, 15, 22, 29, 35, 6, 26 |
| * | | 4,10, 17, 24, 30, 37, 11, 31 |
| * | | 5,12, 19, 25, 32, 39, 16, 36 |
| * ----------------------------------------- |
| * |
| * @remark Track in the table should be read top-to-bottom, left-to-right. |
| * |
| * @note (EE.1) This table (from the reference code) does not comply with |
| * the specification. |
| * The specification contains the following table: |
| * |
| * Track|Pulse| Positions |
| * ----------------------------------------- |
| * 2 | 1 | 0, 5, 10, 15, 20, 25, 30, 35 |
| * | | 1, 6, 11, 16, 21, 26, 31, 36 |
| * | | 2, 7, 12, 17, 22, 27, 32, 37 |
| * | | 4, 9, 14, 19, 24, 29, 34, 39 |
| * |
| * ----------------------------------------- |
| * |
| * @note (EE.2) Reference G.729D code also uses gray decoding for each |
| * pulse index before looking up the value in the table. |
| * |
| * Used in G.729 @@6.4k (with gray coding) |
| */ |
| extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32]; |
| |
| /** |
| * b60 hamming windowed sinc function coefficients |
| */ |
| extern const float ff_b60_sinc[61]; |
| |
| /** |
| * Table of pow(0.7,n) |
| */ |
| extern const float ff_pow_0_7[10]; |
| |
| /** |
| * Table of pow(0.75,n) |
| */ |
| extern const float ff_pow_0_75[10]; |
| |
| /** |
| * Table of pow(0.55,n) |
| */ |
| extern const float ff_pow_0_55[10]; |
| |
| /** |
| * Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR). |
| * @param[out] fc_v decoded fixed codebook vector (2.13) |
| * @param tab1 table used for first pulse_count pulses |
| * @param tab2 table used for last pulse |
| * @param pulse_indexes fixed codebook indexes |
| * @param pulse_signs signs of the excitation pulses (0 bit value |
| * means negative sign) |
| * @param bits number of bits per one pulse index |
| * @param pulse_count number of pulses decoded using first table |
| * @param bits length of one pulse index in bits |
| * |
| * Used in G.729 @@8k, G.729 @@4.4k, G.729 @@6.4k, AMR @@7.95k, AMR @@7.40k |
| */ |
| void ff_acelp_fc_pulse_per_track(int16_t* fc_v, |
| const uint8_t *tab1, |
| const uint8_t *tab2, |
| int pulse_indexes, |
| int pulse_signs, |
| int pulse_count, |
| int bits); |
| |
| /** |
| * Decode the algebraic codebook index to pulse positions and signs and |
| * construct the algebraic codebook vector for MODE_12k2. |
| * |
| * @note: The positions and signs are explicitly coded in MODE_12k2. |
| * |
| * @param fixed_index positions of the ten pulses |
| * @param fixed_sparse pointer to the algebraic codebook vector |
| * @param gray_decode gray decoding table |
| * @param half_pulse_count number of couples of pulses |
| * @param bits length of one pulse index in bits |
| */ |
| void ff_decode_10_pulses_35bits(const int16_t *fixed_index, |
| AMRFixed *fixed_sparse, |
| const uint8_t *gray_decode, |
| int half_pulse_count, int bits); |
| |
| |
| /** |
| * weighted sum of two vectors with rounding. |
| * @param[out] out result of addition |
| * @param in_a first vector |
| * @param in_b second vector |
| * @param weight_coeff_a first vector weight coefficient |
| * @param weight_coeff_a second vector weight coefficient |
| * @param rounder this value will be added to the sum of the two vectors |
| * @param shift result will be shifted to right by this value |
| * @param length vectors length |
| * |
| * @note It is safe to pass the same buffer for out and in_a or in_b. |
| * |
| * out[i] = (in_a[i]*weight_a + in_b[i]*weight_b + rounder) >> shift |
| */ |
| void ff_acelp_weighted_vector_sum(int16_t* out, |
| const int16_t *in_a, |
| const int16_t *in_b, |
| int16_t weight_coeff_a, |
| int16_t weight_coeff_b, |
| int16_t rounder, |
| int shift, |
| int length); |
| |
| /** |
| * float implementation of weighted sum of two vectors. |
| * @param[out] out result of addition |
| * @param in_a first vector |
| * @param in_b second vector |
| * @param weight_coeff_a first vector weight coefficient |
| * @param weight_coeff_a second vector weight coefficient |
| * @param length vectors length |
| * |
| * @note It is safe to pass the same buffer for out and in_a or in_b. |
| */ |
| void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b, |
| float weight_coeff_a, float weight_coeff_b, |
| int length); |
| |
| /** |
| * Adaptive gain control (as used in AMR postfiltering) |
| * |
| * @param out output buffer for filtered speech data |
| * @param in the input speech buffer (may be the same as out) |
| * @param speech_energ input energy |
| * @param size the input buffer size |
| * @param alpha exponential filter factor |
| * @param gain_mem a pointer to the filter memory (single float of size) |
| */ |
| void ff_adaptive_gain_control(float *out, const float *in, float speech_energ, |
| int size, float alpha, float *gain_mem); |
| |
| /** |
| * Set the sum of squares of a signal by scaling |
| * |
| * @param out output samples |
| * @param in input samples |
| * @param sum_of_squares new sum of squares |
| * @param n number of samples |
| * |
| * @note If the input is zero (or its energy underflows), the output is zero. |
| * This is the behavior of AGC in the AMR reference decoder. The QCELP |
| * reference decoder seems to have undefined behavior. |
| * |
| * TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6 |
| * 3GPP TS 26.090 6.1 (6) |
| */ |
| void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in, |
| float sum_of_squares, const int n); |
| |
| /** |
| * Add fixed vector to an array from a sparse representation |
| * |
| * @param out fixed vector with pitch sharpening |
| * @param in sparse fixed vector |
| * @param scale number to multiply the fixed vector by |
| * @param size the output vector size |
| */ |
| void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size); |
| |
| /** |
| * Clear array values set by set_fixed_vector |
| * |
| * @param out fixed vector to be cleared |
| * @param in sparse fixed vector |
| * @param size the output vector size |
| */ |
| void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size); |
| |
| #endif /* AVCODEC_ACELP_VECTORS_H */ |
