FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Data Structures | Macros | Functions | Variables
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)
 

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 *const 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 [AAC_CODER_NB]
 

Detailed Description

AAC coefficients encoder.

Definition in file aaccoder.c.

Macro Definition Documentation

#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 210 of file aaccoder.c.

#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 250 of file aaccoder.c.

Referenced by quantize_and_encode_band(), and quantize_band_cost().

#define TRELLIS_STAGES   121

Definition at line 551 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

#define TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Definition at line 552 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

Function Documentation

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_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 abs_pow34_v ( float *  out,
const float *  in,
const int  size 
)
static

Definition at line 86 of file aaccoder.c.

Referenced by codebook_trellis_rate(), encode_window_bands_info(), quantize_and_encode_band_cost_template(), search_for_ms(), search_for_quantizers_anmr(), search_for_quantizers_faac(), and search_for_quantizers_twoloop().

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

Definition at line 257 of file aaccoder.c.

Referenced by codebook_trellis_rate(), encode_window_bands_info(), search_for_ms(), search_for_quantizers_anmr(), search_for_quantizers_faac(), and search_for_quantizers_twoloop().

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 266 of file aaccoder.c.

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

Definition at line 274 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 285 of file aaccoder.c.

Referenced by search_for_quantizers_anmr(), and search_for_quantizers_twoloop().

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 312 of file aaccoder.c.

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

Definition at line 413 of file aaccoder.c.

static av_always_inline uint8_t coef2minsf ( float  coef)
static

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

Definition at line 537 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

static av_always_inline uint8_t coef2maxsf ( float  coef)
static

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

Definition at line 542 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

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

Definition at line 554 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 707 of file aaccoder.c.

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

Definition at line 851 of file aaccoder.c.

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

Definition at line 1018 of file aaccoder.c.

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

Definition at line 1052 of file aaccoder.c.

Variable Documentation

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.

const uint8_t* const run_value_bits[2]
static
Initial value:
= {
run_value_bits_long, run_value_bits_short
}

Definition at line 56 of file aaccoder.c.

Referenced by codebook_trellis_rate(), and encode_window_bands_info().

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().

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().

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 230 of file aaccoder.c.

AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB]
Initial value:
= {
[AAC_CODER_FAAC] = {
search_for_quantizers_faac,
encode_window_bands_info,
quantize_and_encode_band,
search_for_ms,
},
[AAC_CODER_ANMR] = {
search_for_quantizers_anmr,
encode_window_bands_info,
quantize_and_encode_band,
search_for_ms,
},
[AAC_CODER_TWOLOOP] = {
search_for_quantizers_twoloop,
codebook_trellis_rate,
quantize_and_encode_band,
search_for_ms,
},
[AAC_CODER_FAST] = {
search_for_quantizers_fast,
encode_window_bands_info,
quantize_and_encode_band,
search_for_ms,
},
}

Definition at line 1113 of file aaccoder.c.

Referenced by aac_encode_init().

Generated on Sun Sep 14 2014 18:56:19 for FFmpeg by   doxygen 1.8.2