FFmpeg: WMACodecContext Struct Reference

FFmpeg 4.0

#include <libavcodec/wma.h>

Data Fields
AVCodecContext *	avctx

GetBitContext	gb

PutBitContext	pb

int	version
	1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) More...

int	use_bit_reservoir

int	use_variable_block_len

int	use_exp_vlc
	exponent coding: 0 = lsp, 1 = vlc + delta More...

int	use_noise_coding
	true if perceptual noise is added More...

int	byte_offset_bits

VLC	exp_vlc

int	exponent_sizes [BLOCK_NB_SIZES]

uint16_t	exponent_bands [BLOCK_NB_SIZES][25]

int	high_band_start [BLOCK_NB_SIZES]
	index of first coef in high band More...

int	coefs_start
	first coded coef More...

int	coefs_end [BLOCK_NB_SIZES]
	max number of coded coefficients More...

int	exponent_high_sizes [BLOCK_NB_SIZES]

int	exponent_high_bands [BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]

VLC	hgain_vlc

int	high_band_coded [MAX_CHANNELS][HIGH_BAND_MAX_SIZE]

int	high_band_values [MAX_CHANNELS][HIGH_BAND_MAX_SIZE]

VLC	coef_vlc [2]

uint16_t *	run_table [2]

float *	level_table [2]

uint16_t *	int_table [2]

const CoefVLCTable *	coef_vlcs [2]

int	frame_len
	frame length in samples More...

int	frame_len_bits
	frame_len = 1 << frame_len_bits More...

int	nb_block_sizes
	number of block sizes More...

int	reset_block_lengths

int	block_len_bits
	log2 of current block length More...

int	next_block_len_bits
	log2 of next block length More...

int	prev_block_len_bits
	log2 of prev block length More...

int	block_len
	block length in samples More...

int	block_num
	block number in current frame More...

int	block_pos
	current position in frame More...

uint8_t	ms_stereo
	true if mid/side stereo mode More...

uint8_t	channel_coded [MAX_CHANNELS]
	true if channel is coded More...

int	exponents_bsize [MAX_CHANNELS]
	log2 ratio frame/exp. length More...

float	exponents [MAX_CHANNELS][BLOCK_MAX_SIZE]

float	max_exponent [MAX_CHANNELS]

WMACoef	coefs1 [MAX_CHANNELS][BLOCK_MAX_SIZE]

float	coefs [MAX_CHANNELS][BLOCK_MAX_SIZE]

FFTSample	output [BLOCK_MAX_SIZE *2]

FFTContext	mdct_ctx [BLOCK_NB_SIZES]

const float *	windows [BLOCK_NB_SIZES]

float	frame_out [MAX_CHANNELS][BLOCK_MAX_SIZE *2]

uint8_t	last_superframe [MAX_CODED_SUPERFRAME_SIZE+AV_INPUT_BUFFER_PADDING_SIZE]

int	last_bitoffset

int	last_superframe_len

float	noise_table [NOISE_TAB_SIZE]

int	noise_index

float	noise_mult

float	lsp_cos_table [BLOCK_MAX_SIZE]

float	lsp_pow_e_table [256]

float	lsp_pow_m_table1 [(1<< LSP_POW_BITS)]

float	lsp_pow_m_table2 [(1<< LSP_POW_BITS)]

AVFloatDSPContext *	fdsp

Detailed Description

Definition at line 67 of file wma.h.

Field Documentation

◆ avctx

AVCodecContext* WMACodecContext::avctx

Definition at line 68 of file wma.h.

Referenced by decode_exp_vlc(), encode_block(), encode_frame(), encode_init(), ff_wma_init(), wma_decode_block(), wma_decode_frame(), wma_decode_init(), and wma_decode_superframe().

◆ gb

GetBitContext WMACodecContext::gb

Definition at line 69 of file wma.h.

Referenced by decode_exp_lsp(), decode_exp_vlc(), wma_decode_block(), and wma_decode_superframe().

◆ pb

PutBitContext WMACodecContext::pb

Definition at line 70 of file wma.h.

Referenced by encode_block(), encode_exp_vlc(), encode_frame(), and encode_superframe().

◆ version

int WMACodecContext::version

1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)

Definition at line 71 of file wma.h.

Referenced by decode_exp_vlc(), encode_block(), encode_exp_vlc(), ff_wma_init(), and wma_decode_block().

◆ use_bit_reservoir

int WMACodecContext::use_bit_reservoir

Definition at line 72 of file wma.h.

Referenced by encode_frame(), encode_init(), wma_decode_init(), and wma_decode_superframe().

◆ use_variable_block_len

int WMACodecContext::use_variable_block_len

Definition at line 73 of file wma.h.

Referenced by encode_block(), encode_init(), ff_wma_init(), wma_decode_block(), and wma_decode_init().

◆ use_exp_vlc

int WMACodecContext::use_exp_vlc

exponent coding: 0 = lsp, 1 = vlc + delta

Definition at line 74 of file wma.h.

Referenced by encode_block(), encode_init(), ff_wma_end(), ff_wma_init(), wma_decode_block(), and wma_decode_init().

◆ use_noise_coding

int WMACodecContext::use_noise_coding

true if perceptual noise is added

Definition at line 75 of file wma.h.

Referenced by encode_block(), ff_wma_end(), ff_wma_init(), wma_decode_block(), and wma_decode_init().

◆ byte_offset_bits

int WMACodecContext::byte_offset_bits

Definition at line 76 of file wma.h.

Referenced by ff_wma_init(), and wma_decode_superframe().

◆ exp_vlc

VLC WMACodecContext::exp_vlc

Definition at line 77 of file wma.h.

Referenced by decode_exp_vlc(), ff_wma_end(), and wma_decode_init().

◆ exponent_sizes

int WMACodecContext::exponent_sizes[BLOCK_NB_SIZES]

Definition at line 78 of file wma.h.

Referenced by ff_wma_init().

◆ exponent_bands

uint16_t WMACodecContext::exponent_bands[BLOCK_NB_SIZES][25]

Definition at line 79 of file wma.h.

Referenced by decode_exp_vlc(), encode_exp_vlc(), ff_wma_init(), and init_exp().

◆ high_band_start

int WMACodecContext::high_band_start[BLOCK_NB_SIZES]

index of first coef in high band

Definition at line 80 of file wma.h.

Referenced by ff_wma_init(), and wma_decode_block().

◆ coefs_start

int WMACodecContext::coefs_start

first coded coef

Definition at line 81 of file wma.h.

Referenced by encode_block(), ff_wma_init(), and wma_decode_block().

◆ coefs_end

int WMACodecContext::coefs_end[BLOCK_NB_SIZES]

max number of coded coefficients

Definition at line 82 of file wma.h.

Referenced by encode_block(), ff_wma_init(), and wma_decode_block().

◆ exponent_high_sizes

int WMACodecContext::exponent_high_sizes[BLOCK_NB_SIZES]

Definition at line 83 of file wma.h.

Referenced by encode_block(), ff_wma_init(), and wma_decode_block().

◆ exponent_high_bands

int WMACodecContext::exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]

Definition at line 84 of file wma.h.

Referenced by encode_block(), ff_wma_init(), and wma_decode_block().

◆ hgain_vlc

VLC WMACodecContext::hgain_vlc

Definition at line 85 of file wma.h.

Referenced by ff_wma_end(), wma_decode_block(), and wma_decode_init().

◆ high_band_coded

int WMACodecContext::high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]

Definition at line 88 of file wma.h.

Referenced by encode_block(), and wma_decode_block().

◆ high_band_values

int WMACodecContext::high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]

Definition at line 89 of file wma.h.

Referenced by wma_decode_block().

◆ coef_vlc

VLC WMACodecContext::coef_vlc[2]

Definition at line 93 of file wma.h.

Referenced by ff_wma_end(), and wma_decode_block().

◆ run_table

uint16_t* WMACodecContext::run_table[2]

Definition at line 94 of file wma.h.

Referenced by ff_wma_end(), and wma_decode_block().

◆ level_table

float* WMACodecContext::level_table[2]

Definition at line 95 of file wma.h.

Referenced by ff_wma_end(), and wma_decode_block().

◆ int_table

uint16_t* WMACodecContext::int_table[2]

Definition at line 96 of file wma.h.

Referenced by encode_block(), and ff_wma_end().

◆ coef_vlcs

const CoefVLCTable* WMACodecContext::coef_vlcs[2]

Definition at line 97 of file wma.h.

Referenced by encode_block().

◆ frame_len

int WMACodecContext::frame_len

frame length in samples

Definition at line 99 of file wma.h.

Referenced by encode_init(), ff_wma_init(), wma_decode_block(), wma_decode_frame(), wma_decode_init(), and wma_decode_superframe().

◆ frame_len_bits

int WMACodecContext::frame_len_bits

frame_len = 1 << frame_len_bits

Definition at line 100 of file wma.h.

Referenced by apply_window_and_mdct(), decode_exp_vlc(), encode_block(), encode_exp_vlc(), encode_init(), encode_superframe(), ff_wma_init(), init_exp(), wma_decode_block(), wma_decode_init(), wma_decode_superframe(), and wma_window().

◆ nb_block_sizes

int WMACodecContext::nb_block_sizes

number of block sizes

Definition at line 101 of file wma.h.

Referenced by encode_init(), ff_wma_end(), ff_wma_init(), wma_decode_block(), and wma_decode_init().

◆ reset_block_lengths

int WMACodecContext::reset_block_lengths

Definition at line 103 of file wma.h.

Referenced by ff_wma_init(), wma_decode_block(), and wma_decode_superframe().

◆ block_len_bits

int WMACodecContext::block_len_bits

log2 of current block length

Definition at line 104 of file wma.h.

Referenced by apply_window_and_mdct(), decode_exp_vlc(), encode_block(), encode_exp_vlc(), encode_superframe(), ff_wma_init(), init_exp(), wma_decode_block(), wma_decode_superframe(), and wma_window().

◆ next_block_len_bits

int WMACodecContext::next_block_len_bits

log2 of next block length

Definition at line 105 of file wma.h.

Referenced by encode_block(), ff_wma_init(), wma_decode_block(), and wma_window().

◆ prev_block_len_bits

int WMACodecContext::prev_block_len_bits

log2 of prev block length

Definition at line 106 of file wma.h.

Referenced by encode_block(), ff_wma_init(), wma_decode_block(), and wma_window().

◆ block_len

int WMACodecContext::block_len

block length in samples

Definition at line 107 of file wma.h.

Referenced by decode_exp_lsp(), decode_exp_vlc(), encode_block(), encode_exp_vlc(), encode_superframe(), init_exp(), wma_decode_block(), wma_decode_superframe(), and wma_window().

◆ block_num

int WMACodecContext::block_num

block number in current frame

Definition at line 108 of file wma.h.

Referenced by wma_decode_block(), and wma_decode_frame().

◆ block_pos

int WMACodecContext::block_pos

current position in frame

Definition at line 109 of file wma.h.

Referenced by wma_decode_block(), and wma_decode_frame().

◆ ms_stereo

uint8_t WMACodecContext::ms_stereo

true if mid/side stereo mode

Definition at line 110 of file wma.h.

Referenced by encode_block(), encode_init(), encode_superframe(), and wma_decode_block().

◆ channel_coded

uint8_t WMACodecContext::channel_coded[MAX_CHANNELS]

true if channel is coded

Definition at line 111 of file wma.h.

Referenced by encode_block(), and wma_decode_block().

◆ exponents_bsize

int WMACodecContext::exponents_bsize[MAX_CHANNELS]

log2 ratio frame/exp. length

Definition at line 112 of file wma.h.

Referenced by wma_decode_block().

◆ exponents

float WMACodecContext::exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]

Definition at line 113 of file wma.h.

Referenced by decode_exp_lsp(), decode_exp_vlc(), encode_block(), encode_exp_vlc(), init_exp(), and wma_decode_block().

◆ max_exponent

float WMACodecContext::max_exponent[MAX_CHANNELS]

Definition at line 114 of file wma.h.

Referenced by decode_exp_lsp(), decode_exp_vlc(), encode_block(), init_exp(), wma_decode_block(), and wma_decode_init().

◆ coefs1

WMACoef WMACodecContext::coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]

Definition at line 115 of file wma.h.

Referenced by encode_block(), and wma_decode_block().

◆ coefs

float WMACodecContext::coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]

Definition at line 116 of file wma.h.

Referenced by apply_window_and_mdct(), encode_superframe(), and wma_decode_block().

◆ output

FFTSample WMACodecContext::output[BLOCK_MAX_SIZE *2]

Definition at line 117 of file wma.h.

Referenced by apply_window_and_mdct(), wma_decode_block(), and wma_window().

◆ mdct_ctx

FFTContext WMACodecContext::mdct_ctx[BLOCK_NB_SIZES]

Definition at line 118 of file wma.h.

Referenced by apply_window_and_mdct(), encode_init(), ff_wma_end(), wma_decode_block(), and wma_decode_init().

◆ windows

const float* WMACodecContext::windows[BLOCK_NB_SIZES]

Definition at line 119 of file wma.h.

Referenced by apply_window_and_mdct(), ff_wma_init(), and wma_window().

◆ frame_out

float WMACodecContext::frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE *2]

Definition at line 121 of file wma.h.

Referenced by apply_window_and_mdct(), wma_decode_block(), and wma_decode_frame().

◆ last_superframe

uint8_t WMACodecContext::last_superframe[MAX_CODED_SUPERFRAME_SIZE+AV_INPUT_BUFFER_PADDING_SIZE]

Definition at line 123 of file wma.h.

Referenced by wma_decode_superframe().

◆ last_bitoffset

int WMACodecContext::last_bitoffset

Definition at line 124 of file wma.h.

Referenced by flush(), and wma_decode_superframe().

◆ last_superframe_len

int WMACodecContext::last_superframe_len

Definition at line 125 of file wma.h.

Referenced by flush(), and wma_decode_superframe().

◆ noise_table

float WMACodecContext::noise_table[NOISE_TAB_SIZE]

Definition at line 126 of file wma.h.

Referenced by ff_wma_init(), and wma_decode_block().

◆ noise_index

int WMACodecContext::noise_index

Definition at line 127 of file wma.h.

Referenced by wma_decode_block().

◆ noise_mult

float WMACodecContext::noise_mult

Definition at line 128 of file wma.h.

Referenced by ff_wma_init(), and wma_decode_block().

◆ lsp_cos_table

float WMACodecContext::lsp_cos_table[BLOCK_MAX_SIZE]

Definition at line 130 of file wma.h.

Referenced by wma_lsp_to_curve(), and wma_lsp_to_curve_init().

◆ lsp_pow_e_table

float WMACodecContext::lsp_pow_e_table[256]

Definition at line 131 of file wma.h.

Referenced by pow_m1_4(), and wma_lsp_to_curve_init().

◆ lsp_pow_m_table1

float WMACodecContext::lsp_pow_m_table1[(1<< LSP_POW_BITS)]

Definition at line 132 of file wma.h.

Referenced by pow_m1_4(), and wma_lsp_to_curve_init().

◆ lsp_pow_m_table2

float WMACodecContext::lsp_pow_m_table2[(1<< LSP_POW_BITS)]

Definition at line 133 of file wma.h.

Referenced by pow_m1_4(), and wma_lsp_to_curve_init().

◆ fdsp

AVFloatDSPContext* WMACodecContext::fdsp

Definition at line 134 of file wma.h.

Referenced by apply_window_and_mdct(), ff_wma_end(), wma_decode_block(), and wma_window().

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

libavcodec/wma.h