libavcodec/aaccoder.c File Reference

AAC coefficients encoder. More...

#include "libavutil/libm.h"
#include <float.h>
#include <math.h>
#include "avcodec.h"
#include "put_bits.h"
#include "aac.h"
#include "aacenc.h"
#include "aactab.h"

Go to the source code of this file.

Data Structures

struct  BandCodingPath
 structure used in optimal codebook search More...
struct  TrellisPath

Defines

#define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC)
#define quantize_and_encode_band_cost(s, pb, in, scaled, size, scale_idx, cb, lambda, uplim, bits)
#define TRELLIS_STAGES   121
#define TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Functions

static av_always_inline int quant (float coef, const float Q)
 Quantize one coefficient.
static void quantize_bands (int *out, const float *in, const float *scaled, int size, float Q34, int is_signed, int maxval)
static void abs_pow34_v (float *out, const float *in, const int size)
static av_always_inline float quantize_and_encode_band_cost_template (struct AACEncContext *s, PutBitContext *pb, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits, int BT_ZERO, int BT_UNSIGNED, int BT_PAIR, int BT_ESC)
 Calculate rate distortion cost for quantizing with given codebook.
static float quantize_band_cost (struct AACEncContext *s, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits)
static void quantize_and_encode_band (struct AACEncContext *s, PutBitContext *pb, const float *in, int size, int scale_idx, int cb, const float lambda)
static float find_max_val (int group_len, int swb_size, const float *scaled)
static int find_min_book (float maxval, int sf)
static void encode_window_bands_info (AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda)
 Encode band info for single window group bands.
static void codebook_trellis_rate (AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda)
static av_always_inline uint8_t coef2minsf (float coef)
 Return the minimum scalefactor where the quantized coef does not clip.
static av_always_inline uint8_t coef2maxsf (float coef)
 Return the maximum scalefactor where the quantized coef is not zero.
static void search_for_quantizers_anmr (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
static void search_for_quantizers_twoloop (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
 two-loop quantizers search taken from ISO 13818-7 Appendix C
static void search_for_quantizers_faac (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
static void search_for_quantizers_fast (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
static void search_for_ms (AACEncContext *s, ChannelElement *cpe, const float lambda)

Variables

static const uint8_t run_value_bits_long [64]
 bits needed to code codebook run value for long windows
static const uint8_t run_value_bits_short [16]
 bits needed to code codebook run value for short windows
static const uint8_t * run_value_bits [2]
static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}
static const uint8_t aac_cb_maxval [12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}
static float(*const quantize_and_encode_band_cost_arr [])(struct AACEncContext *s, PutBitContext *pb, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits)
AACCoefficientsEncoder ff_aac_coders []


Detailed Description

AAC coefficients encoder.

Definition in file aaccoder.c.


Define Documentation

#define quantize_and_encode_band_cost ( s,
pb,
in,
scaled,
size,
scale_idx,
cb,
lambda,
uplim,
bits   ) 

Value:

quantize_and_encode_band_cost_arr[cb](                              \
                                s, pb, in, scaled, size, scale_idx, cb, \
                                lambda, uplim, bits)

Definition at line 251 of file aaccoder.c.

Referenced by quantize_and_encode_band(), and quantize_band_cost().

#define QUANTIZE_AND_ENCODE_BAND_COST_FUNC ( NAME,
BT_ZERO,
BT_UNSIGNED,
BT_PAIR,
BT_ESC   ) 

Value:

static float quantize_and_encode_band_cost_ ## NAME(                                        \
                                struct AACEncContext *s,                                \
                                PutBitContext *pb, const float *in,                     \
                                const float *scaled, int size, int scale_idx,           \
                                int cb, const float lambda, const float uplim,          \
                                int *bits) {                                            \
    return quantize_and_encode_band_cost_template(                                      \
                                s, pb, in, scaled, size, scale_idx,                     \
                                BT_ESC ? ESC_BT : cb, lambda, uplim, bits,              \
                                BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC);                 \
}

Definition at line 209 of file aaccoder.c.

#define TRELLIS_STAGES   121

Definition at line 534 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

#define TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Definition at line 535 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().


Function Documentation

static void abs_pow34_v ( float *  out,
const float *  in,
const int  size 
) [static]

static void codebook_trellis_rate ( AACEncContext s,
SingleChannelElement sce,
int  win,
int  group_len,
const float  lambda 
) [static]

Definition at line 412 of file aaccoder.c.

static av_always_inline uint8_t coef2maxsf ( float  coef  )  [static]

Return the maximum scalefactor where the quantized coef is not zero.

Definition at line 525 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

static av_always_inline uint8_t coef2minsf ( float  coef  )  [static]

Return the minimum scalefactor where the quantized coef does not clip.

Definition at line 520 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

static void encode_window_bands_info ( AACEncContext s,
SingleChannelElement sce,
int  win,
int  group_len,
const float  lambda 
) [static]

Encode band info for single window group bands.

Definition at line 311 of file aaccoder.c.

static float find_max_val ( int  group_len,
int  swb_size,
const float *  scaled 
) [static]

Definition at line 273 of file aaccoder.c.

Referenced by search_for_quantizers_anmr(), and search_for_quantizers_twoloop().

static int find_min_book ( float  maxval,
int  sf 
) [static]

Definition at line 284 of file aaccoder.c.

Referenced by search_for_quantizers_anmr(), and search_for_quantizers_twoloop().

static av_always_inline int quant ( float  coef,
const float  Q 
) [static]

Quantize one coefficient.

Returns:
absolute value of the quantized coefficient
See also:
3GPP TS26.403 5.6.2 "Scalefactor determination"

Definition at line 66 of file aaccoder.c.

static void quantize_and_encode_band ( struct AACEncContext s,
PutBitContext pb,
const float *  in,
int  size,
int  scale_idx,
int  cb,
const float  lambda 
) [static]

Definition at line 265 of file aaccoder.c.

static av_always_inline float quantize_and_encode_band_cost_template ( struct AACEncContext s,
PutBitContext pb,
const float *  in,
const float *  scaled,
int  size,
int  scale_idx,
int  cb,
const float  lambda,
const float  uplim,
int *  bits,
int  BT_ZERO,
int  BT_UNSIGNED,
int  BT_PAIR,
int  BT_ESC 
) [static]

Calculate rate distortion cost for quantizing with given codebook.

Returns:
quantization distortion

Definition at line 105 of file aaccoder.c.

static float quantize_band_cost ( struct AACEncContext s,
const float *  in,
const float *  scaled,
int  size,
int  scale_idx,
int  cb,
const float  lambda,
const float  uplim,
int *  bits 
) [static]

static void quantize_bands ( int *  out,
const float *  in,
const float *  scaled,
int  size,
float  Q34,
int  is_signed,
int  maxval 
) [static]

Definition at line 72 of file aaccoder.c.

Referenced by quantize_and_encode_band_cost_template().

static void search_for_ms ( AACEncContext s,
ChannelElement cpe,
const float  lambda 
) [static]

Definition at line 1038 of file aaccoder.c.

static void search_for_quantizers_anmr ( AVCodecContext avctx,
AACEncContext s,
SingleChannelElement sce,
const float  lambda 
) [static]

Definition at line 537 of file aaccoder.c.

static void search_for_quantizers_faac ( AVCodecContext avctx,
AACEncContext s,
SingleChannelElement sce,
const float  lambda 
) [static]

Definition at line 836 of file aaccoder.c.

static void search_for_quantizers_fast ( AVCodecContext avctx,
AACEncContext s,
SingleChannelElement sce,
const float  lambda 
) [static]

Definition at line 1004 of file aaccoder.c.

static void search_for_quantizers_twoloop ( AVCodecContext avctx,
AACEncContext s,
SingleChannelElement sce,
const float  lambda 
) [static]

two-loop quantizers search taken from ISO 13818-7 Appendix C

Definition at line 693 of file aaccoder.c.


Variable Documentation

const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16} [static]

Definition at line 98 of file aaccoder.c.

Referenced by quantize_and_encode_band_cost_template().

const uint8_t aac_cb_range[12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17} [static]

Definition at line 97 of file aaccoder.c.

Referenced by quantize_and_encode_band_cost_template().

float(*const quantize_and_encode_band_cost_arr[])(struct AACEncContext *s, PutBitContext *pb, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits) [static]

Initial value:

 {
    quantize_and_encode_band_cost_ZERO,
    quantize_and_encode_band_cost_SQUAD,
    quantize_and_encode_band_cost_SQUAD,
    quantize_and_encode_band_cost_UQUAD,
    quantize_and_encode_band_cost_UQUAD,
    quantize_and_encode_band_cost_SPAIR,
    quantize_and_encode_band_cost_SPAIR,
    quantize_and_encode_band_cost_UPAIR,
    quantize_and_encode_band_cost_UPAIR,
    quantize_and_encode_band_cost_UPAIR,
    quantize_and_encode_band_cost_UPAIR,
    quantize_and_encode_band_cost_ESC,
}

const uint8_t* run_value_bits[2] [static]

Initial value:

Definition at line 56 of file aaccoder.c.

Referenced by codebook_trellis_rate(), and encode_window_bands_info().

const uint8_t run_value_bits_long[64] [static]

Initial value:

 {
     5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
     5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
    10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
    10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
}
bits needed to code codebook run value for long windows

Definition at line 44 of file aaccoder.c.

const uint8_t run_value_bits_short[16] [static]

Initial value:

 {
    3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
}
bits needed to code codebook run value for short windows

Definition at line 52 of file aaccoder.c.


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