| /* | |
| * 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 | |
| */ | |
| 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_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); | |