AC-3 encoder private context. More...

#include <ac3enc.h>

Data Fields
AVClass *	av_class
	AVClass used for AVOption.

AC3EncOptions	options
	encoding options

AVCodecContext *	avctx
	parent AVCodecContext

AudioDSPContext	adsp

AVFixedDSPContext *	fdsp

MECmpContext	mecc

AC3DSPContext	ac3dsp
	AC-3 optimized functions.

AVTXContext *	tx
	FFT context for MDCT calculation.

av_tx_fn	tx_fn

AC3Block	blocks [AC3_MAX_BLOCKS]
	per-block info

int	fixed_point
	indicates if fixed-point encoder is being used

int	eac3
	indicates if this is E-AC-3 vs. AC-3

int	bitstream_id
	bitstream id (bsid)

int	bitstream_mode
	bitstream mode (bsmod)

int	bit_rate
	target bit rate, in bits-per-second

int	sample_rate
	sampling frequency, in Hz

int	num_blks_code
	number of blocks code (numblkscod)

int	num_blocks
	number of blocks per frame

int	frame_size_min
	minimum frame size in case rounding is necessary

int	frame_size
	current frame size in bytes

int	frame_size_code
	frame size code (frmsizecod)

uint16_t	crc_inv [2]

int64_t	bits_written
	bit count (used to avg. bitrate)

int64_t	samples_written
	sample count (used to avg. bitrate)

int	fbw_channels
	number of full-bandwidth channels (nfchans)

int	channels
	total number of channels (nchans)

int	lfe_on
	indicates if there is an LFE channel (lfeon)

int	lfe_channel
	channel index of the LFE channel

int	has_center
	indicates if there is a center channel

int	has_surround
	indicates if there are one or more surround channels

int	channel_mode
	channel mode (acmod)

const uint8_t *	channel_map
	channel map used to reorder channels

int	center_mix_level
	center mix level code

int	surround_mix_level
	surround mix level code

int	ltrt_center_mix_level
	Lt/Rt center mix level code.

int	ltrt_surround_mix_level
	Lt/Rt surround mix level code.

int	loro_center_mix_level
	Lo/Ro center mix level code.

int	loro_surround_mix_level
	Lo/Ro surround mix level code.

int	cutoff
	user-specified cutoff frequency, in Hz

int	bandwidth_code
	bandwidth code (0 to 60) (chbwcod)

int	start_freq [AC3_MAX_CHANNELS]
	start frequency bin (strtmant)

int	cpl_end_freq
	coupling channel end frequency bin

int	cpl_on
	coupling turned on for this frame

int	cpl_enabled
	coupling enabled for all frames

int	num_cpl_subbands
	number of coupling subbands (ncplsubnd)

int	num_cpl_bands
	number of coupling bands (ncplbnd)

uint8_t	cpl_band_sizes [AC3_MAX_CPL_BANDS]
	number of coeffs in each coupling band

int	rematrixing_enabled
	stereo rematrixing enabled

int	slow_gain_code
	slow gain code (sgaincod)

int	slow_decay_code
	slow decay code (sdcycod)

int	fast_decay_code
	fast decay code (fdcycod)

int	db_per_bit_code
	dB/bit code (dbpbcod)

int	floor_code
	floor code (floorcod)

AC3BitAllocParameters	bit_alloc
	bit allocation parameters

int	coarse_snr_offset
	coarse SNR offsets (csnroffst)

int	fast_gain_code [AC3_MAX_CHANNELS]
	fast gain codes (signal-to-mask ratio) (fgaincod)

int	fine_snr_offset [AC3_MAX_CHANNELS]
	fine SNR offsets (fsnroffst)

int	frame_bits_fixed
	number of non-coefficient bits for fixed parameters

int	frame_bits
	all frame bits except exponents and mantissas

int	exponent_bits
	number of bits used for exponents

uint8_t *	planar_samples [AC3_MAX_CHANNELS - 1]

uint8_t *	input_samples [AC3_MAX_CHANNELS - 1]

uint8_t *	bap_buffer

uint8_t *	bap1_buffer

CoefType *	mdct_coef_buffer

int32_t *	fixed_coef_buffer

uint8_t *	exp_buffer

uint8_t *	grouped_exp_buffer

int16_t *	psd_buffer

int16_t *	band_psd_buffer

int16_t *	mask_buffer

int16_t *	qmant_buffer

uint8_t *	cpl_coord_buffer

uint8_t	exp_strategy [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
	exponent strategies

uint8_t	frame_exp_strategy [AC3_MAX_CHANNELS]
	frame exp strategy index

int	use_frame_exp_strategy
	indicates use of frame exp strategy

uint8_t	exp_ref_block [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
	reference blocks for EXP_REUSE

uint8_t *	ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
	bit allocation pointers (bap)

int	ref_bap_set
	indicates if ref_bap pointers have been set

AudioFrameQueue	afq

void(*	encode_frame )(struct AC3EncodeContext s, const AVFrame frame)
	fixed vs.

void(*	output_frame_header )(struct AC3EncodeContext s, struct PutBitContext pb)

union {

float mdct_window_float [AC3_BLOCK_SIZE]

int32_t mdct_window_fixed [AC3_BLOCK_SIZE]

};

union {

float windowed_samples_float [AC3_WINDOW_SIZE]

int32_t windowed_samples_fixed [AC3_WINDOW_SIZE]

};

Detailed Description

AC-3 encoder private context.

Definition at line 159 of file ac3enc.h.

Field Documentation

◆ av_class

AVClass* AC3EncodeContext::av_class

AVClass used for AVOption.

Definition at line 160 of file ac3enc.h.

◆ options

AC3EncOptions AC3EncodeContext::options

encoding options

Definition at line 161 of file ac3enc.h.

◆ avctx

AVCodecContext* AC3EncodeContext::avctx

parent AVCodecContext

Definition at line 162 of file ac3enc.h.

◆ adsp

AudioDSPContext AC3EncodeContext::adsp

Definition at line 163 of file ac3enc.h.

◆ fdsp

AVFixedDSPContext* AC3EncodeContext::fdsp

Definition at line 167 of file ac3enc.h.

◆ mecc

MECmpContext AC3EncodeContext::mecc

Definition at line 169 of file ac3enc.h.

◆ ac3dsp

AC3DSPContext AC3EncodeContext::ac3dsp

AC-3 optimized functions.

Definition at line 170 of file ac3enc.h.

◆ tx

AVTXContext* AC3EncodeContext::tx

FFT context for MDCT calculation.

Definition at line 171 of file ac3enc.h.

◆ tx_fn

av_tx_fn AC3EncodeContext::tx_fn

Definition at line 172 of file ac3enc.h.

◆ blocks

AC3Block AC3EncodeContext::blocks[AC3_MAX_BLOCKS]

per-block info

Definition at line 174 of file ac3enc.h.

◆ fixed_point

int AC3EncodeContext::fixed_point

indicates if fixed-point encoder is being used

Definition at line 176 of file ac3enc.h.

◆ eac3

int AC3EncodeContext::eac3

indicates if this is E-AC-3 vs. AC-3

Definition at line 177 of file ac3enc.h.

◆ bitstream_id

int AC3EncodeContext::bitstream_id

bitstream id (bsid)

Definition at line 178 of file ac3enc.h.

◆ bitstream_mode

int AC3EncodeContext::bitstream_mode

bitstream mode (bsmod)

Definition at line 179 of file ac3enc.h.

◆ bit_rate

int AC3EncodeContext::bit_rate

target bit rate, in bits-per-second

Definition at line 181 of file ac3enc.h.

◆ sample_rate

int AC3EncodeContext::sample_rate

sampling frequency, in Hz

Definition at line 182 of file ac3enc.h.

◆ num_blks_code

int AC3EncodeContext::num_blks_code

number of blocks code (numblkscod)

Definition at line 184 of file ac3enc.h.

◆ num_blocks

int AC3EncodeContext::num_blocks

number of blocks per frame

Definition at line 185 of file ac3enc.h.

◆ frame_size_min

int AC3EncodeContext::frame_size_min

minimum frame size in case rounding is necessary

Definition at line 186 of file ac3enc.h.

◆ frame_size

int AC3EncodeContext::frame_size

current frame size in bytes

Definition at line 187 of file ac3enc.h.

◆ frame_size_code

int AC3EncodeContext::frame_size_code

frame size code (frmsizecod)

Definition at line 188 of file ac3enc.h.

◆ crc_inv

uint16_t AC3EncodeContext::crc_inv[2]

Definition at line 189 of file ac3enc.h.

◆ bits_written

int64_t AC3EncodeContext::bits_written

bit count (used to avg. bitrate)

Definition at line 190 of file ac3enc.h.

◆ samples_written

int64_t AC3EncodeContext::samples_written

sample count (used to avg. bitrate)

Definition at line 191 of file ac3enc.h.

◆ fbw_channels

int AC3EncodeContext::fbw_channels

number of full-bandwidth channels (nfchans)

Definition at line 193 of file ac3enc.h.

◆ channels

int AC3EncodeContext::channels

total number of channels (nchans)

Definition at line 194 of file ac3enc.h.

◆ lfe_on

int AC3EncodeContext::lfe_on

indicates if there is an LFE channel (lfeon)

Definition at line 195 of file ac3enc.h.

◆ lfe_channel

int AC3EncodeContext::lfe_channel

channel index of the LFE channel

Definition at line 196 of file ac3enc.h.

◆ has_center

int AC3EncodeContext::has_center

indicates if there is a center channel

Definition at line 197 of file ac3enc.h.

◆ has_surround

int AC3EncodeContext::has_surround

indicates if there are one or more surround channels

Definition at line 198 of file ac3enc.h.

◆ channel_mode

int AC3EncodeContext::channel_mode

channel mode (acmod)

Definition at line 199 of file ac3enc.h.

◆ channel_map

const uint8_t* AC3EncodeContext::channel_map

channel map used to reorder channels

Definition at line 200 of file ac3enc.h.

◆ center_mix_level

int AC3EncodeContext::center_mix_level

center mix level code

Definition at line 202 of file ac3enc.h.

◆ surround_mix_level

int AC3EncodeContext::surround_mix_level

surround mix level code

Definition at line 203 of file ac3enc.h.

◆ ltrt_center_mix_level

int AC3EncodeContext::ltrt_center_mix_level

Lt/Rt center mix level code.

Definition at line 204 of file ac3enc.h.

◆ ltrt_surround_mix_level

int AC3EncodeContext::ltrt_surround_mix_level

Lt/Rt surround mix level code.

Definition at line 205 of file ac3enc.h.

◆ loro_center_mix_level

int AC3EncodeContext::loro_center_mix_level

Lo/Ro center mix level code.

Definition at line 206 of file ac3enc.h.

◆ loro_surround_mix_level

int AC3EncodeContext::loro_surround_mix_level

Lo/Ro surround mix level code.

Definition at line 207 of file ac3enc.h.

◆ cutoff

int AC3EncodeContext::cutoff

user-specified cutoff frequency, in Hz

Definition at line 209 of file ac3enc.h.

◆ bandwidth_code

int AC3EncodeContext::bandwidth_code

bandwidth code (0 to 60) (chbwcod)

Definition at line 210 of file ac3enc.h.

◆ start_freq

int AC3EncodeContext::start_freq[AC3_MAX_CHANNELS]

start frequency bin (strtmant)

Definition at line 211 of file ac3enc.h.

◆ cpl_end_freq

int AC3EncodeContext::cpl_end_freq

coupling channel end frequency bin

Definition at line 212 of file ac3enc.h.

◆ cpl_on

int AC3EncodeContext::cpl_on

coupling turned on for this frame

Definition at line 214 of file ac3enc.h.

◆ cpl_enabled

int AC3EncodeContext::cpl_enabled

coupling enabled for all frames

Definition at line 215 of file ac3enc.h.

◆ num_cpl_subbands

int AC3EncodeContext::num_cpl_subbands

number of coupling subbands (ncplsubnd)

Definition at line 216 of file ac3enc.h.

◆ num_cpl_bands

int AC3EncodeContext::num_cpl_bands

number of coupling bands (ncplbnd)

Definition at line 217 of file ac3enc.h.

◆ cpl_band_sizes

uint8_t AC3EncodeContext::cpl_band_sizes[AC3_MAX_CPL_BANDS]

number of coeffs in each coupling band

Definition at line 218 of file ac3enc.h.

◆ rematrixing_enabled

int AC3EncodeContext::rematrixing_enabled

stereo rematrixing enabled

Definition at line 220 of file ac3enc.h.

◆ slow_gain_code

int AC3EncodeContext::slow_gain_code

slow gain code (sgaincod)

Definition at line 223 of file ac3enc.h.

◆ slow_decay_code

int AC3EncodeContext::slow_decay_code

slow decay code (sdcycod)

Definition at line 224 of file ac3enc.h.

◆ fast_decay_code

int AC3EncodeContext::fast_decay_code

fast decay code (fdcycod)

Definition at line 225 of file ac3enc.h.

◆ db_per_bit_code

int AC3EncodeContext::db_per_bit_code

dB/bit code (dbpbcod)

Definition at line 226 of file ac3enc.h.

◆ floor_code

int AC3EncodeContext::floor_code

floor code (floorcod)

Definition at line 227 of file ac3enc.h.

◆ bit_alloc

AC3BitAllocParameters AC3EncodeContext::bit_alloc

bit allocation parameters

Definition at line 228 of file ac3enc.h.

◆ coarse_snr_offset

int AC3EncodeContext::coarse_snr_offset

coarse SNR offsets (csnroffst)

Definition at line 229 of file ac3enc.h.

◆ fast_gain_code

int AC3EncodeContext::fast_gain_code[AC3_MAX_CHANNELS]

fast gain codes (signal-to-mask ratio) (fgaincod)

Definition at line 230 of file ac3enc.h.

◆ fine_snr_offset

int AC3EncodeContext::fine_snr_offset[AC3_MAX_CHANNELS]

fine SNR offsets (fsnroffst)

Definition at line 231 of file ac3enc.h.

◆ frame_bits_fixed

int AC3EncodeContext::frame_bits_fixed

number of non-coefficient bits for fixed parameters

Definition at line 232 of file ac3enc.h.

◆ frame_bits

int AC3EncodeContext::frame_bits

all frame bits except exponents and mantissas

Definition at line 233 of file ac3enc.h.

◆ exponent_bits

int AC3EncodeContext::exponent_bits

number of bits used for exponents

Definition at line 234 of file ac3enc.h.

◆ planar_samples

uint8_t* AC3EncodeContext::planar_samples[AC3_MAX_CHANNELS - 1]

Definition at line 236 of file ac3enc.h.

◆ input_samples

uint8_t* AC3EncodeContext::input_samples[AC3_MAX_CHANNELS - 1]

Definition at line 237 of file ac3enc.h.

◆ bap_buffer

uint8_t* AC3EncodeContext::bap_buffer

Definition at line 238 of file ac3enc.h.

◆ bap1_buffer

uint8_t* AC3EncodeContext::bap1_buffer

Definition at line 239 of file ac3enc.h.

◆ mdct_coef_buffer

CoefType* AC3EncodeContext::mdct_coef_buffer

Definition at line 240 of file ac3enc.h.

◆ fixed_coef_buffer

int32_t* AC3EncodeContext::fixed_coef_buffer

Definition at line 241 of file ac3enc.h.

◆ exp_buffer

uint8_t* AC3EncodeContext::exp_buffer

Definition at line 242 of file ac3enc.h.

◆ grouped_exp_buffer

uint8_t* AC3EncodeContext::grouped_exp_buffer

Definition at line 243 of file ac3enc.h.

◆ psd_buffer

int16_t* AC3EncodeContext::psd_buffer

Definition at line 244 of file ac3enc.h.

◆ band_psd_buffer

int16_t* AC3EncodeContext::band_psd_buffer

Definition at line 245 of file ac3enc.h.

◆ mask_buffer

int16_t* AC3EncodeContext::mask_buffer

Definition at line 246 of file ac3enc.h.

◆ qmant_buffer

int16_t* AC3EncodeContext::qmant_buffer

Definition at line 247 of file ac3enc.h.

◆ cpl_coord_buffer

uint8_t* AC3EncodeContext::cpl_coord_buffer

Definition at line 248 of file ac3enc.h.

◆ exp_strategy

uint8_t AC3EncodeContext::exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]

exponent strategies

Definition at line 250 of file ac3enc.h.

◆ frame_exp_strategy

uint8_t AC3EncodeContext::frame_exp_strategy[AC3_MAX_CHANNELS]

frame exp strategy index

Definition at line 251 of file ac3enc.h.

◆ use_frame_exp_strategy

int AC3EncodeContext::use_frame_exp_strategy

indicates use of frame exp strategy

Definition at line 252 of file ac3enc.h.

◆ exp_ref_block

uint8_t AC3EncodeContext::exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]

reference blocks for EXP_REUSE

Definition at line 253 of file ac3enc.h.

◆ ref_bap

uint8_t* AC3EncodeContext::ref_bap[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]

bit allocation pointers (bap)

Definition at line 254 of file ac3enc.h.

◆ ref_bap_set

int AC3EncodeContext::ref_bap_set

indicates if ref_bap pointers have been set

Definition at line 255 of file ac3enc.h.

◆ afq

AudioFrameQueue AC3EncodeContext::afq

Definition at line 257 of file ac3enc.h.

◆ encode_frame

void(* AC3EncodeContext::encode_frame) (struct AC3EncodeContext *s, const AVFrame *frame)

fixed vs.

float function pointers

Definition at line 260 of file ac3enc.h.

◆ output_frame_header

void(* AC3EncodeContext::output_frame_header) (struct AC3EncodeContext *s, struct PutBitContext *pb)

Definition at line 263 of file ac3enc.h.

◆ mdct_window_float

float AC3EncodeContext::mdct_window_float[AC3_BLOCK_SIZE]

Definition at line 266 of file ac3enc.h.

◆ mdct_window_fixed

int32_t AC3EncodeContext::mdct_window_fixed[AC3_BLOCK_SIZE]

Definition at line 267 of file ac3enc.h.

◆ [union]

union { ... } AC3EncodeContext

◆ windowed_samples_float

float AC3EncodeContext::windowed_samples_float[AC3_WINDOW_SIZE]

Definition at line 270 of file ac3enc.h.

◆ windowed_samples_fixed

int32_t AC3EncodeContext::windowed_samples_fixed[AC3_WINDOW_SIZE]

Definition at line 271 of file ac3enc.h.