#include <ac3dec.h>
Public Member Functions | |
| DECLARE_ALIGNED_16 (int, fixed_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]) | |
| DECLARE_ALIGNED_16 (float, transform_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]) | |
| transform coefficients | |
| DECLARE_ALIGNED_16 (float, delay[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]) | |
| delay - added to the next block | |
| DECLARE_ALIGNED_16 (float, window[AC3_BLOCK_SIZE]) | |
| window coefficients | |
| DECLARE_ALIGNED_16 (float, tmp_output[AC3_BLOCK_SIZE]) | |
| temporary storage for output before windowing | |
| DECLARE_ALIGNED_16 (float, output[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]) | |
| output after imdct transform and windowing | |
Data Fields | |
| AVCodecContext * | avctx |
| parent context | |
| GetBitContext | gbc |
| bitstream reader | |
| uint8_t * | input_buffer |
| temp buffer to prevent overread | |
| int | frame_type |
| frame type (strmtyp) | |
| int | substreamid |
| substream identification | |
| int | frame_size |
| current frame size, in bytes | |
| int | bit_rate |
| stream bit rate, in bits-per-second | |
| int | sample_rate |
| sample frequency, in Hz | |
| int | num_blocks |
| number of audio blocks | |
| int | channel_mode |
| channel mode (acmod) | |
| int | lfe_on |
| lfe channel in use | |
| int | channel_map |
| custom channel map | |
| int | center_mix_level |
| Center mix level index. | |
| int | surround_mix_level |
| Surround mix level index. | |
| int | eac3 |
| indicates if current frame is E-AC-3 | |
| int | snr_offset_strategy |
| SNR offset strategy (snroffststr). | |
| int | block_switch_syntax |
| block switch syntax enabled (blkswe) | |
| int | dither_flag_syntax |
| dither flag syntax enabled (dithflage) | |
| int | bit_allocation_syntax |
| bit allocation model syntax enabled (bamode) | |
| int | fast_gain_syntax |
| fast gain codes enabled (frmfgaincode) | |
| int | dba_syntax |
| delta bit allocation syntax enabled (dbaflde) | |
| int | skip_syntax |
| skip field syntax enabled (skipflde) | |
| int | cpl_in_use [MAX_BLOCKS] |
| coupling in use (cplinu) | |
| int | cpl_strategy_exists [MAX_BLOCKS] |
| coupling strategy exists (cplstre) | |
| int | channel_in_cpl [AC3_MAX_CHANNELS] |
| channel in coupling (chincpl) | |
| int | phase_flags_in_use |
| phase flags in use (phsflginu) | |
| int | phase_flags [18] |
| phase flags (phsflg) | |
| int | num_cpl_subbands |
| number of coupling sub bands (ncplsubnd) | |
| int | num_cpl_bands |
| number of coupling bands (ncplbnd) | |
| uint8_t | cpl_band_struct [18] |
| coupling band structure (cplbndstrc) | |
| int | firstchincpl |
| first channel in coupling | |
| int | first_cpl_coords [AC3_MAX_CHANNELS] |
| first coupling coordinates states (firstcplcos) | |
| int | cpl_coords [AC3_MAX_CHANNELS][18] |
| coupling coordinates (cplco) | |
| int | channel_uses_aht [AC3_MAX_CHANNELS] |
| channel AHT in use (chahtinu) | |
| int | pre_mantissa [AC3_MAX_CHANNELS][AC3_MAX_COEFS][MAX_BLOCKS] |
| pre-IDCT mantissas | |
| int | fbw_channels |
| number of full-bandwidth channels | |
| int | channels |
| number of total channels | |
| int | lfe_ch |
| index of LFE channel | |
| float | downmix_coeffs [AC3_MAX_CHANNELS][2] |
| stereo downmix coefficients | |
| int | downmixed |
| indicates if coeffs are currently downmixed | |
| int | output_mode |
| output channel configuration | |
| int | out_channels |
| number of output channels | |
| float | dynamic_range [2] |
| dynamic range | |
| int | start_freq [AC3_MAX_CHANNELS] |
| start frequency bin (strtmant) | |
| int | end_freq [AC3_MAX_CHANNELS] |
| end frequency bin (endmant) | |
| int | num_rematrixing_bands |
| number of rematrixing bands (nrematbnd) | |
| int | rematrixing_flags [4] |
| rematrixing flags (rematflg) | |
| int | num_exp_groups [AC3_MAX_CHANNELS] |
| Number of exponent groups (nexpgrp). | |
| int8_t | dexps [AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
| decoded exponents | |
| int | exp_strategy [MAX_BLOCKS][AC3_MAX_CHANNELS] |
| exponent strategies (expstr) | |
| AC3BitAllocParameters | bit_alloc_params |
| bit allocation parameters | |
| int | first_cpl_leak |
| first coupling leak state (firstcplleak) | |
| int | snr_offset [AC3_MAX_CHANNELS] |
| signal-to-noise ratio offsets (snroffst) | |
| int | fast_gain [AC3_MAX_CHANNELS] |
| fast gain values/SMR's (fgain) | |
| uint8_t | bap [AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
| bit allocation pointers | |
| int16_t | psd [AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
| scaled exponents | |
| int16_t | band_psd [AC3_MAX_CHANNELS][50] |
| interpolated exponents | |
| int16_t | mask [AC3_MAX_CHANNELS][50] |
| masking curve values | |
| int | dba_mode [AC3_MAX_CHANNELS] |
| delta bit allocation mode | |
| int | dba_nsegs [AC3_MAX_CHANNELS] |
| number of delta segments | |
| uint8_t | dba_offsets [AC3_MAX_CHANNELS][8] |
| delta segment offsets | |
| uint8_t | dba_lengths [AC3_MAX_CHANNELS][8] |
| delta segment lengths | |
| uint8_t | dba_values [AC3_MAX_CHANNELS][8] |
| delta values for each segment | |
| int | dither_flag [AC3_MAX_CHANNELS] |
| dither flags (dithflg) | |
| AVLFG | dith_state |
| for dither generation | |
| int | block_switch [AC3_MAX_CHANNELS] |
| block switch flags (blksw) | |
| MDCTContext | imdct_512 |
| for 512 sample IMDCT | |
| MDCTContext | imdct_256 |
| for 256 sample IMDCT | |
| DSPContext | dsp |
| for optimization | |
| float | add_bias |
| offset for float_to_int16 conversion | |
| float | mul_bias |
| scaling for float_to_int16 conversion | |
Definition at line 47 of file ac3dec.h.
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | float | , | |
| output | [AC3_MAX_CHANNELS][AC3_BLOCK_SIZE] | |||
| ) |
output after imdct transform and windowing
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | float | , | |
| tmp_output | [AC3_BLOCK_SIZE] | |||
| ) |
temporary storage for output before windowing
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | float | , | |
| window | [AC3_BLOCK_SIZE] | |||
| ) |
window coefficients
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | float | , | |
| delay | [AC3_MAX_CHANNELS][AC3_BLOCK_SIZE] | |||
| ) |
delay - added to the next block
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | float | , | |
| transform_coeffs | [AC3_MAX_CHANNELS][AC3_MAX_COEFS] | |||
| ) |
transform coefficients
| AC3DecodeContext::DECLARE_ALIGNED_16 | ( | int | , | |
| fixed_coeffs | [AC3_MAX_CHANNELS][AC3_MAX_COEFS] | |||
| ) |
offset for float_to_int16 conversion
Definition at line 156 of file ac3dec.h.
Referenced by ac3_decode_init(), and do_imdct().
parent context
Definition at line 48 of file ac3dec.h.
Referenced by ac3_decode_init(), decode_audio_block(), ff_eac3_decode_transform_coeffs_aht_ch(), and ff_eac3_parse_header().
| int16_t AC3DecodeContext::band_psd[AC3_MAX_CHANNELS][50] |
| uint8_t AC3DecodeContext::bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
bit allocation pointers
Definition at line 132 of file ac3dec.h.
Referenced by ac3_decode_transform_coeffs_ch(), decode_audio_block(), ff_eac3_decode_transform_coeffs_aht_ch(), and remove_dithering().
bit allocation parameters
Definition at line 128 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
bit allocation model syntax enabled (bamode)
Definition at line 72 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| int AC3DecodeContext::block_switch[AC3_MAX_CHANNELS] |
block switch flags (blksw)
Definition at line 149 of file ac3dec.h.
Referenced by decode_audio_block(), do_imdct(), and ff_eac3_parse_header().
block switch syntax enabled (blkswe)
Definition at line 70 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| int AC3DecodeContext::channel_in_cpl[AC3_MAX_CHANNELS] |
channel in coupling (chincpl)
Definition at line 81 of file ac3dec.h.
Referenced by calc_transform_coeffs_cpl(), decode_audio_block(), decode_transform_coeffs(), parse_frame_header(), and remove_dithering().
| int AC3DecodeContext::channel_uses_aht[AC3_MAX_CHANNELS] |
channel AHT in use (chahtinu)
Definition at line 93 of file ac3dec.h.
Referenced by decode_audio_block(), decode_transform_coeffs_ch(), ff_eac3_parse_header(), and parse_frame_header().
number of total channels
Definition at line 99 of file ac3dec.h.
Referenced by ac3_decode_frame(), decode_audio_block(), decode_transform_coeffs(), ff_eac3_parse_header(), and parse_frame_header().
| uint8_t AC3DecodeContext::cpl_band_struct[18] |
coupling band structure (cplbndstrc)
Definition at line 86 of file ac3dec.h.
Referenced by calc_transform_coeffs_cpl(), and decode_audio_block().
| int AC3DecodeContext::cpl_coords[AC3_MAX_CHANNELS][18] |
coupling coordinates (cplco)
Definition at line 89 of file ac3dec.h.
Referenced by calc_transform_coeffs_cpl(), and decode_audio_block().
| int AC3DecodeContext::cpl_in_use[MAX_BLOCKS] |
coupling in use (cplinu)
Definition at line 79 of file ac3dec.h.
Referenced by decode_audio_block(), and ff_eac3_parse_header().
| int AC3DecodeContext::cpl_strategy_exists[MAX_BLOCKS] |
coupling strategy exists (cplstre)
Definition at line 80 of file ac3dec.h.
Referenced by decode_audio_block(), and ff_eac3_parse_header().
| uint8_t AC3DecodeContext::dba_lengths[AC3_MAX_CHANNELS][8] |
| int AC3DecodeContext::dba_mode[AC3_MAX_CHANNELS] |
delta bit allocation mode
Definition at line 136 of file ac3dec.h.
Referenced by decode_audio_block().
| int AC3DecodeContext::dba_nsegs[AC3_MAX_CHANNELS] |
number of delta segments
Definition at line 137 of file ac3dec.h.
Referenced by decode_audio_block().
| uint8_t AC3DecodeContext::dba_offsets[AC3_MAX_CHANNELS][8] |
delta bit allocation syntax enabled (dbaflde)
Definition at line 74 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| uint8_t AC3DecodeContext::dba_values[AC3_MAX_CHANNELS][8] |
delta values for each segment
Definition at line 140 of file ac3dec.h.
Referenced by decode_audio_block().
| int8_t AC3DecodeContext::dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
decoded exponents
Definition at line 123 of file ac3dec.h.
Referenced by ac3_decode_transform_coeffs_ch(), decode_audio_block(), and decode_transform_coeffs_ch().
for dither generation
Definition at line 145 of file ac3dec.h.
Referenced by ac3_decode_init(), ac3_decode_transform_coeffs_ch(), and ff_eac3_decode_transform_coeffs_aht_ch().
| int AC3DecodeContext::dither_flag[AC3_MAX_CHANNELS] |
dither flags (dithflg)
Definition at line 144 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and remove_dithering().
dither flag syntax enabled (dithflage)
Definition at line 71 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| float AC3DecodeContext::downmix_coeffs[AC3_MAX_CHANNELS][2] |
stereo downmix coefficients
Definition at line 101 of file ac3dec.h.
Referenced by decode_audio_block(), and set_downmix_coeffs().
indicates if coeffs are currently downmixed
Definition at line 102 of file ac3dec.h.
Referenced by ac3_decode_init(), and decode_audio_block().
for optimization
Definition at line 155 of file ac3dec.h.
Referenced by ac3_decode_frame(), ac3_decode_init(), decode_audio_block(), and do_imdct().
| float AC3DecodeContext::dynamic_range[2] |
| int AC3DecodeContext::end_freq[AC3_MAX_CHANNELS] |
end frequency bin (endmant)
Definition at line 113 of file ac3dec.h.
Referenced by ac3_decode_transform_coeffs_ch(), decode_audio_block(), decode_transform_coeffs(), do_rematrixing(), parse_frame_header(), and remove_dithering().
| int AC3DecodeContext::exp_strategy[MAX_BLOCKS][AC3_MAX_CHANNELS] |
exponent strategies (expstr)
Definition at line 124 of file ac3dec.h.
Referenced by decode_audio_block(), and ff_eac3_parse_header().
| int AC3DecodeContext::fast_gain[AC3_MAX_CHANNELS] |
fast gain values/SMR's (fgain)
Definition at line 131 of file ac3dec.h.
Referenced by decode_audio_block().
fast gain codes enabled (frmfgaincode)
Definition at line 73 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
number of full-bandwidth channels
Definition at line 98 of file ac3dec.h.
Referenced by ac3_decode_frame(), calc_transform_coeffs_cpl(), decode_audio_block(), ff_eac3_parse_header(), parse_frame_header(), remove_dithering(), and set_downmix_coeffs().
| int AC3DecodeContext::first_cpl_coords[AC3_MAX_CHANNELS] |
first coupling coordinates states (firstcplcos)
Definition at line 88 of file ac3dec.h.
Referenced by decode_audio_block(), and ff_eac3_parse_header().
first coupling leak state (firstcplleak)
Definition at line 129 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
bitstream reader
Definition at line 49 of file ac3dec.h.
Referenced by ac3_decode_frame(), ac3_decode_transform_coeffs_ch(), ac3_parse_header(), decode_audio_block(), ff_eac3_decode_transform_coeffs_aht_ch(), ff_eac3_parse_header(), and parse_frame_header().
for 256 sample IMDCT
Definition at line 151 of file ac3dec.h.
Referenced by ac3_decode_end(), ac3_decode_init(), and do_imdct().
for 512 sample IMDCT
Definition at line 150 of file ac3dec.h.
Referenced by ac3_decode_end(), ac3_decode_init(), and do_imdct().
| uint8_t* AC3DecodeContext::input_buffer |
temp buffer to prevent overread
Definition at line 50 of file ac3dec.h.
Referenced by ac3_decode_end(), ac3_decode_frame(), and ac3_decode_init().
index of LFE channel
Definition at line 100 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| int16_t AC3DecodeContext::mask[AC3_MAX_CHANNELS][50] |
scaling for float_to_int16 conversion
Definition at line 157 of file ac3dec.h.
Referenced by ac3_decode_init(), and decode_audio_block().
number of coupling bands (ncplbnd)
Definition at line 85 of file ac3dec.h.
Referenced by calc_transform_coeffs_cpl(), and decode_audio_block().
number of coupling sub bands (ncplsubnd)
Definition at line 84 of file ac3dec.h.
Referenced by decode_audio_block().
| int AC3DecodeContext::num_exp_groups[AC3_MAX_CHANNELS] |
Number of exponent groups (nexpgrp).
Definition at line 122 of file ac3dec.h.
Referenced by decode_audio_block(), and parse_frame_header().
number of rematrixing bands (nrematbnd)
Definition at line 117 of file ac3dec.h.
Referenced by decode_audio_block(), and do_rematrixing().
number of output channels
Definition at line 104 of file ac3dec.h.
Referenced by ac3_decode_frame(), decode_audio_block(), and do_imdct().
output channel configuration
Definition at line 103 of file ac3dec.h.
Referenced by ac3_decode_frame(), decode_audio_block(), and set_downmix_coeffs().
| int AC3DecodeContext::phase_flags[18] |
phase flags (phsflg)
Definition at line 83 of file ac3dec.h.
Referenced by calc_transform_coeffs_cpl(), and decode_audio_block().
phase flags in use (phsflginu)
Definition at line 82 of file ac3dec.h.
Referenced by decode_audio_block().
| int AC3DecodeContext::pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][MAX_BLOCKS] |
pre-IDCT mantissas
Definition at line 94 of file ac3dec.h.
Referenced by decode_transform_coeffs_ch(), and ff_eac3_decode_transform_coeffs_aht_ch().
| int16_t AC3DecodeContext::psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS] |
rematrixing flags (rematflg)
Definition at line 118 of file ac3dec.h.
Referenced by decode_audio_block(), and do_rematrixing().
skip field syntax enabled (skipflde)
Definition at line 75 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| int AC3DecodeContext::snr_offset[AC3_MAX_CHANNELS] |
signal-to-noise ratio offsets (snroffst)
Definition at line 130 of file ac3dec.h.
Referenced by decode_audio_block(), and ff_eac3_parse_header().
SNR offset strategy (snroffststr).
Definition at line 69 of file ac3dec.h.
Referenced by decode_audio_block(), ff_eac3_parse_header(), and parse_frame_header().
| int AC3DecodeContext::start_freq[AC3_MAX_CHANNELS] |
start frequency bin (strtmant)
Definition at line 112 of file ac3dec.h.
Referenced by ac3_decode_transform_coeffs_ch(), calc_transform_coeffs_cpl(), decode_audio_block(), decode_transform_coeffs_ch(), ff_eac3_decode_transform_coeffs_aht_ch(), parse_frame_header(), and remove_dithering().
1.5.8