acelp_vectors.c File Reference

#include <inttypes.h>
#include "avcodec.h"
#include "acelp_vectors.h"

Go to the source code of this file.

Functions
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 fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
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)
	weighted sum of two vectors with rounding
Variables
const uint8_t	ff_fc_2pulses_9bits_track1 [16]
const uint8_t	ff_fc_2pulses_9bits_track1_gray [16]
const uint8_t	ff_fc_2pulses_9bits_track2_gray [32]
const uint8_t	ff_fc_4pulses_8bits_tracks_13 [16]
const uint8_t	ff_fc_4pulses_8bits_track_4 [32]

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Function Documentation

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 fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).

Parameters:

	fc_v	[out] decoded fixed codebook vector (2.13)
	tab1	table used for first pulse_count pulses
	tab2	table used for last pulse
	pulse_indexes	fixed codebook indexes
	pulse_signs	signs of the excitation pulses (0 bit value means negative sign)
	bits	number of bits per one pulse index
	pulse_count	number of pulses decoded using first table
	bits	length of one pulse index in bits

Used in G.729 , G.729 .4k, G.729 .4k, AMR .95k, AMR .40k

Definition at line 105 of file acelp_vectors.c.

References mask.

{
    int mask = (1 << bits) - 1;
    int i;

    for(i=0; i<pulse_count; i++)
    {
        fc_v[i + tab1[pulse_indexes & mask]] +=
                (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)

        pulse_indexes >>= bits;
        pulse_signs >>= 1;
    }

    fc_v[tab2[pulse_indexes]] += (pulse_signs & 1) ? 8191 : -8192;
}

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
	)

weighted sum of two vectors with rounding

Parameters:

	out	[out] result of addition
	in_a	first vector
	in_b	second vector
	weight_coeff_a	first vector weight coefficient
	weight_coeff_a	second vector weight coefficient
	rounder	this value will be added to the sum of the two vectors
	shift	result will be shifted to right by this value
	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

Definition at line 129 of file acelp_vectors.c.

References av_clip_int16().

{
    int i;

    // Clipping required here; breaks OVERFLOW test.
    for(i=0; i<length; i++)
        out[i] = av_clip_int16((
                 in_a[i] * weight_coeff_a +
                 in_b[i] * weight_coeff_b +
                 rounder) >> shift);
}

---

Variable Documentation

const uint8_t ff_fc_2pulses_9bits_track1[16]

Initial value:

{
    1,  3,
    6,  8,
    11, 13,
    16, 18,
    21, 23,
    26, 28,
    31, 33,
    36, 38
}

Definition at line 27 of file acelp_vectors.c.

const uint8_t ff_fc_2pulses_9bits_track1_gray[16]

Initial value:

{
  1,  3,
  8,  6,
  18, 16,
  11, 13,
  38, 36,
  31, 33,
  21, 23,
  28, 26,
}

Definition at line 38 of file acelp_vectors.c.

const uint8_t ff_fc_2pulses_9bits_track2_gray[32]

Initial value:

{
  0,  2,
  5,  4,
  12, 10,
  7,  9,
  25, 24,
  20, 22,
  14, 15,
  19, 17,
  36, 31,
  21, 26,
  1,  6,
  16, 11,
  27, 29,
  32, 30,
  39, 37,
  34, 35,
}

Definition at line 50 of file acelp_vectors.c.

const uint8_t ff_fc_4pulses_8bits_track_4[32]

Initial value:

{
    3,  4,
    8,  9,
    13, 14,
    18, 19,
    23, 24,
    28, 29,
    33, 34,
    38, 39,
    43, 44,
    48, 49,
    53, 54,
    58, 59,
    63, 64,
    68, 69,
    73, 74,
    78, 79,
}

Definition at line 75 of file acelp_vectors.c.

const uint8_t ff_fc_4pulses_8bits_tracks_13[16]

Initial value:

{
  0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
}

Definition at line 70 of file acelp_vectors.c.

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