AACEncContext Struct Reference

AAC encoder context. More...

#include <aacenc.h>

Data Fields

AVClass * av_class

AACEncOptions options

encoding options

PutBitContext pb

AVTXContext * mdct1024

long (1024 samples) frame transform context

av_tx_fn mdct1024_fn

AVTXContext * mdct128

short (128 samples) frame transform context

av_tx_fn mdct128_fn

AVFloatDSPContext * fdsp

AACPCEInfo pce

PCE data, if needed.

float * planar_samples [16]

saved preprocessed input

int profile

copied from avctx

int needs_pce

flag for non-standard layout

int needs_height_ext

flag for PCE height extension

LPCContext lpc

used by TNS

int samplerate_index

MPEG-4 samplerate index.

int channels

channel count

int bandwidth

coding bandwidth in Hz, fixed at init; the psy model and the coders' band cutoff agree on it

const uint8_t * reorder_map

lavc to aac reorder map

const uint8_t * chan_map

channel configuration map

ChannelElement * cpe

channel elements

FFPsyContext psy

const AACCoefficientsEncoder * coder

int cur_channel

current channel for coder context

int random_state

float lambda

int last_frame_pb_count

number of bits for the previous frame

float lambda_sum

sum(lambda), for Qvg reporting

int lambda_count

count(lambda), for Qvg reporting

uint64_t stat_ch_bands

uint64_t stat_pns

coded channel-bands, of which PNS

uint64_t stat_cpe_bands

uint64_t stat_ms

uint64_t stat_is

coded CPE pair-bands, of which M/S, I/S

uint64_t stat_chans

uint64_t stat_short

coded channels, of which short-block (transient)

uint64_t stat_tns_long

uint64_t stat_tns_short

TNS-active channels among long / short blocks.

enum RawDataBlockType cur_type

channel group type cur_channel belongs to

AudioFrameQueue afq

int qcoefs [96]

quantized coefficients

float scoefs [1024]

scaled coefficients

uint16_t quantize_band_cost_cache_generation

AACQuantizeBandCostCacheEntry quantize_band_cost_cache [256][128]

memoization area for quantize_band_cost

AACEncDSPContext aacdsp

AACNMRCurves * nmr

NMR coder scratch (NULL unless coder == nmr)

struct {

float * samples

} buffer

Detailed Description

AAC encoder context.

Definition at line 260 of file aacenc.h.

Field Documentation

◆ av_class

AVClass* AACEncContext::av_class

Definition at line 261 of file aacenc.h.

◆ options

AACEncOptions AACEncContext::options

encoding options

Definition at line 262 of file aacenc.h.

◆ pb

PutBitContext AACEncContext::pb

Definition at line 263 of file aacenc.h.

Referenced by ff_quantize_and_encode_band_cost(), quantize_and_encode_band(), and quantize_and_encode_band_cost_template().

◆ mdct1024

AVTXContext* AACEncContext::mdct1024

long (1024 samples) frame transform context

Definition at line 264 of file aacenc.h.

◆ mdct1024_fn

av_tx_fn AACEncContext::mdct1024_fn

Definition at line 265 of file aacenc.h.

◆ mdct128

AVTXContext* AACEncContext::mdct128

short (128 samples) frame transform context

Definition at line 266 of file aacenc.h.

◆ mdct128_fn

av_tx_fn AACEncContext::mdct128_fn

Definition at line 267 of file aacenc.h.

◆ fdsp

AVFloatDSPContext* AACEncContext::fdsp

Definition at line 268 of file aacenc.h.

◆ pce

AACPCEInfo AACEncContext::pce

PCE data, if needed.

Definition at line 269 of file aacenc.h.

◆ planar_samples

float* AACEncContext::planar_samples[16]

saved preprocessed input

Definition at line 270 of file aacenc.h.

◆ profile

int AACEncContext::profile

copied from avctx

Definition at line 272 of file aacenc.h.

◆ needs_pce

int AACEncContext::needs_pce

flag for non-standard layout

Definition at line 273 of file aacenc.h.

◆ needs_height_ext

int AACEncContext::needs_height_ext

flag for PCE height extension

Definition at line 274 of file aacenc.h.

◆ lpc

LPCContext AACEncContext::lpc

used by TNS

Definition at line 275 of file aacenc.h.

◆ samplerate_index

int AACEncContext::samplerate_index

MPEG-4 samplerate index.

Definition at line 276 of file aacenc.h.

◆ channels

int AACEncContext::channels

channel count

Definition at line 277 of file aacenc.h.

◆ bandwidth

int AACEncContext::bandwidth

coding bandwidth in Hz, fixed at init; the psy model and the coders' band cutoff agree on it

Definition at line 278 of file aacenc.h.

◆ reorder_map

const uint8_t* AACEncContext::reorder_map

lavc to aac reorder map

Definition at line 279 of file aacenc.h.

◆ chan_map

const uint8_t* AACEncContext::chan_map

channel configuration map

Definition at line 280 of file aacenc.h.

◆ cpe

ChannelElement* AACEncContext::cpe

channel elements

Definition at line 282 of file aacenc.h.

◆ psy

FFPsyContext AACEncContext::psy

Definition at line 283 of file aacenc.h.

◆ coder

const AACCoefficientsEncoder* AACEncContext::coder

Definition at line 284 of file aacenc.h.

◆ cur_channel

int AACEncContext::cur_channel

current channel for coder context

Definition at line 285 of file aacenc.h.

◆ random_state

int AACEncContext::random_state

Definition at line 286 of file aacenc.h.

◆ lambda

float AACEncContext::lambda

Definition at line 287 of file aacenc.h.

Referenced by ff_quantize_and_encode_band_cost(), quantize_and_encode_band(), and quantize_and_encode_band_cost_template().

◆ last_frame_pb_count

int AACEncContext::last_frame_pb_count

number of bits for the previous frame

Definition at line 288 of file aacenc.h.

◆ lambda_sum

float AACEncContext::lambda_sum

sum(lambda), for Qvg reporting

Definition at line 289 of file aacenc.h.

◆ lambda_count

int AACEncContext::lambda_count

count(lambda), for Qvg reporting

Definition at line 290 of file aacenc.h.

◆ stat_ch_bands

uint64_t AACEncContext::stat_ch_bands

Definition at line 293 of file aacenc.h.

◆ stat_pns

uint64_t AACEncContext::stat_pns

coded channel-bands, of which PNS

Definition at line 293 of file aacenc.h.

◆ stat_cpe_bands

uint64_t AACEncContext::stat_cpe_bands

Definition at line 294 of file aacenc.h.

◆ stat_ms

uint64_t AACEncContext::stat_ms

Definition at line 294 of file aacenc.h.

◆ stat_is

uint64_t AACEncContext::stat_is

coded CPE pair-bands, of which M/S, I/S

Definition at line 294 of file aacenc.h.

◆ stat_chans

uint64_t AACEncContext::stat_chans

Definition at line 295 of file aacenc.h.

◆ stat_short

uint64_t AACEncContext::stat_short

coded channels, of which short-block (transient)

Definition at line 295 of file aacenc.h.

◆ stat_tns_long

uint64_t AACEncContext::stat_tns_long

Definition at line 296 of file aacenc.h.

◆ stat_tns_short

uint64_t AACEncContext::stat_tns_short

TNS-active channels among long / short blocks.

Definition at line 296 of file aacenc.h.

◆ cur_type

enum RawDataBlockType AACEncContext::cur_type

channel group type cur_channel belongs to

Definition at line 297 of file aacenc.h.

◆ afq

AudioFrameQueue AACEncContext::afq

Definition at line 299 of file aacenc.h.

◆ qcoefs

int AACEncContext::qcoefs[96]

quantized coefficients

Definition at line 300 of file aacenc.h.

◆ scoefs

float AACEncContext::scoefs[1024]

scaled coefficients

Definition at line 301 of file aacenc.h.

◆ quantize_band_cost_cache_generation

uint16_t AACEncContext::quantize_band_cost_cache_generation

Definition at line 303 of file aacenc.h.

◆ quantize_band_cost_cache

AACQuantizeBandCostCacheEntry AACEncContext::quantize_band_cost_cache[256][128]

memoization area for quantize_band_cost

Definition at line 304 of file aacenc.h.

◆ aacdsp

AACEncDSPContext AACEncContext::aacdsp

Definition at line 306 of file aacenc.h.

◆ nmr

AACNMRCurves* AACEncContext::nmr

NMR coder scratch (NULL unless coder == nmr)

Definition at line 307 of file aacenc.h.

◆ samples

float* AACEncContext::samples

Definition at line 310 of file aacenc.h.

◆ [struct]

struct { ... } AACEncContext::buffer

The documentation for this struct was generated from the following file:

libavcodec/aacenc.h

Generated on Sun Sep 6 2026 19:21:23 for FFmpeg by doxygen 1.13.2