mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 03:34:56 +00:00
0c50f8e6cc
to aid generic gain control routines. Changes for qcelp are included. Patch Collin McQuillan. Originally committed as revision 20450 to svn://svn.ffmpeg.org/ffmpeg/trunk
198 lines
7.2 KiB
C
198 lines
7.2 KiB
C
/*
|
|
* 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>
|
|
|
|
/**
|
|
* 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];
|
|
|
|
/**
|
|
* Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
|
|
* @param fc_v [out] 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Adaptative gain control (as used in AMR postfiltering)
|
|
*
|
|
* @param buf_out the input speech buffer
|
|
* @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_adaptative_gain_control(float *buf_out, 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);
|
|
|
|
#endif /* AVCODEC_ACELP_VECTORS_H */
|