aaccoder.c File Reference

AAC coefficients encoder. More...

#include "libavutil/libm.h"
#include <float.h>
#include "libavutil/mathematics.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
 

Macros

#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)
 

Typedefs

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

Functions

static av_always_inline int quant (float coef, const float Q)
 Quantize one coefficient. More...
 
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. More...
 
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. More...
 
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. More...
 
static av_always_inline uint8_t coef2maxsf (float coef)
 Return the maximum scalefactor where the quantized coef is not zero. More...
 
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 More...
 
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 More...
 
static const uint8_t run_value_bits_short [16]
 bits needed to code codebook run value for short windows More...
 
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.

Macro Definition Documentation

#define quantize_and_encode_band_cost (   s,
  pb,
  in,
  scaled,
  size,
  scale_idx,
  cb,
  lambda,
  uplim,
  bits 
)
Value:
s, pb, in, scaled, size, scale_idx, cb, \
lambda, uplim, bits)
int size
uint8_t bits
Definition: crc.c:31
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)
Definition: aaccoder.c:229

Definition at line 249 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) { \
s, pb, in, scaled, size, scale_idx, \
BT_ESC ? ESC_BT : cb, lambda, uplim, bits, \
BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC); \
}
int size
AAC encoder context.
Definition: aacenc.h:54
uint8_t bits
Definition: crc.c:31
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.
Definition: aaccoder.c:105
Spectral data are coded with an escape sequence.
Definition: aac.h:78

Definition at line 209 of file aaccoder.c.

#define TRELLIS_STAGES   121

Definition at line 550 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

#define TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Definition at line 551 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

Typedef Documentation

structure used in optimal codebook search

typedef struct TrellisPath TrellisPath

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 541 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 536 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.

Referenced by quantize_and_encode_band_cost_template(), and search_for_quantizers_faac().

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 1054 of file aaccoder.c.

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

Definition at line 553 of file aaccoder.c.

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

Definition at line 852 of file aaccoder.c.

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

Definition at line 1020 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 709 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().

AACCoefficientsEncoder ff_aac_coders[]
Initial value:
= {
{
},
{
},
{
},
{
},
}
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.
Definition: aaccoder.c:311
static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
Definition: aaccoder.c:1020
static void search_for_ms(AACEncContext *s, ChannelElement *cpe, const float lambda)
Definition: aaccoder.c:1054
static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
Definition: aaccoder.c:553
static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, const float *in, int size, int scale_idx, int cb, const float lambda)
Definition: aaccoder.c:265
static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda)
Definition: aaccoder.c:412
static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
Definition: aaccoder.c:852
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
Definition: aaccoder.c:709

Definition at line 1115 of file aaccoder.c.

Referenced by aac_encode_init().

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,
}

Definition at line 229 of file aaccoder.c.

const uint8_t* run_value_bits[2]
static
Initial value:
= {
}
static const uint8_t run_value_bits_long[64]
bits needed to code codebook run value for long windows
Definition: aaccoder.c:44
static const uint8_t run_value_bits_short[16]
bits needed to code codebook run value for short windows
Definition: aaccoder.c:52

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.