FFmpeg
Data Fields
AMRContext Struct Reference

Data Fields

AMRNBFrame frame
 decoded AMR parameters (lsf coefficients, codebook indexes, etc) More...
 
uint8_t bad_frame_indicator
 bad frame ? 1 : 0 More...
 
enum Mode cur_frame_mode
 
int16_t prev_lsf_r [LP_FILTER_ORDER]
 residual LSF vector from previous subframe More...
 
double lsp [4][LP_FILTER_ORDER]
 lsp vectors from current frame More...
 
double prev_lsp_sub4 [LP_FILTER_ORDER]
 lsp vector for the 4th subframe of the previous frame More...
 
float lsf_q [4][LP_FILTER_ORDER]
 Interpolated LSF vector for fixed gain smoothing. More...
 
float lsf_avg [LP_FILTER_ORDER]
 vector of averaged lsf vector More...
 
float lpc [4][LP_FILTER_ORDER]
 lpc coefficient vectors for 4 subframes More...
 
uint8_t pitch_lag_int
 integer part of pitch lag from current subframe More...
 
float excitation_buf [PITCH_DELAY_MAX+LP_FILTER_ORDER+1+AMR_SUBFRAME_SIZE]
 current excitation and all necessary excitation history More...
 
floatexcitation
 pointer to the current excitation vector in excitation_buf More...
 
float pitch_vector [AMR_SUBFRAME_SIZE]
 adaptive code book (pitch) vector More...
 
float fixed_vector [AMR_SUBFRAME_SIZE]
 algebraic codebook (fixed) vector (must be kept zero between frames) More...
 
float prediction_error [4]
 quantified prediction errors {20log10(^gamma_gc)} for previous four subframes More...
 
float pitch_gain [5]
 quantified pitch gains for the current and previous four subframes More...
 
float fixed_gain [5]
 quantified fixed gains for the current and previous four subframes More...
 
float beta
 previous pitch_gain, bounded by [0.0,SHARP_MAX] More...
 
uint8_t diff_count
 the number of subframes for which diff has been above 0.65 More...
 
uint8_t hang_count
 the number of subframes since a hangover period started More...
 
float prev_sparse_fixed_gain
 previous fixed gain; used by anti-sparseness processing to determine "onset" More...
 
uint8_t prev_ir_filter_nr
 previous impulse response filter "impNr": 0 - strong, 1 - medium, 2 - none More...
 
uint8_t ir_filter_onset
 flag for impulse response filter strength More...
 
float postfilter_mem [10]
 previous intermediate values in the formant filter More...
 
float tilt_mem
 previous input to tilt compensation filter More...
 
float postfilter_agc
 previous factor used for adaptive gain control More...
 
float high_pass_mem [2]
 previous intermediate values in the high-pass filter More...
 
float samples_in [LP_FILTER_ORDER+AMR_SUBFRAME_SIZE]
 floating point samples More...
 
ACELPFContext acelpf_ctx
 context for filters for ACELP-based codecs More...
 
ACELPVContext acelpv_ctx
 context for vector operations for ACELP-based codecs More...
 
CELPFContext celpf_ctx
 context for filters for CELP-based codecs More...
 
CELPMContext celpm_ctx
 context for fixed point math operations More...
 
FFRawDemuxerContext rawctx
 

Detailed Description

Definition at line 100 of file amrnbdec.c.

Field Documentation

◆ frame

AMRNBFrame AMRContext::frame

decoded AMR parameters (lsf coefficients, codebook indexes, etc)

Definition at line 101 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), decode_gains(), lsf2lsp_3(), lsf2lsp_5(), and unpack_bitstream().

◆ bad_frame_indicator

uint8_t AMRContext::bad_frame_indicator

bad frame ? 1 : 0

Definition at line 102 of file amrnbdec.c.

Referenced by unpack_bitstream().

◆ cur_frame_mode

enum Mode AMRContext::cur_frame_mode

◆ prev_lsf_r

int16_t AMRContext::prev_lsf_r[LP_FILTER_ORDER]

residual LSF vector from previous subframe

Definition at line 105 of file amrnbdec.c.

Referenced by lsf2lsp_3(), lsf2lsp_5(), and lsf2lsp_for_mode12k2().

◆ lsp

double AMRContext::lsp[4][LP_FILTER_ORDER]

lsp vectors from current frame

Definition at line 106 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), lsf2lsp_3(), lsf2lsp_5(), and update_state().

◆ prev_lsp_sub4

double AMRContext::prev_lsp_sub4[LP_FILTER_ORDER]

lsp vector for the 4th subframe of the previous frame

Definition at line 107 of file amrnbdec.c.

Referenced by amrnb_decode_init(), lsf2lsp_3(), lsf2lsp_5(), and update_state().

◆ lsf_q

float AMRContext::lsf_q[4][LP_FILTER_ORDER]

Interpolated LSF vector for fixed gain smoothing.

Definition at line 109 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), amrnb_decode_init(), lsf2lsp_3(), and lsf2lsp_for_mode12k2().

◆ lsf_avg

float AMRContext::lsf_avg[LP_FILTER_ORDER]

vector of averaged lsf vector

Definition at line 110 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), and amrnb_decode_init().

◆ lpc

float AMRContext::lpc[4][LP_FILTER_ORDER]

lpc coefficient vectors for 4 subframes

Definition at line 112 of file amrnbdec.c.

Referenced by amrnb_decode_frame().

◆ pitch_lag_int

uint8_t AMRContext::pitch_lag_int

integer part of pitch lag from current subframe

Definition at line 114 of file amrnbdec.c.

Referenced by decode_pitch_vector(), and pitch_sharpening().

◆ excitation_buf

float AMRContext::excitation_buf[PITCH_DELAY_MAX+LP_FILTER_ORDER+1+AMR_SUBFRAME_SIZE]

current excitation and all necessary excitation history

Definition at line 116 of file amrnbdec.c.

Referenced by amrnb_decode_init(), and update_state().

◆ excitation

float* AMRContext::excitation

pointer to the current excitation vector in excitation_buf

Definition at line 117 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), amrnb_decode_init(), and decode_pitch_vector().

◆ pitch_vector

float AMRContext::pitch_vector[AMR_SUBFRAME_SIZE]

adaptive code book (pitch) vector

Definition at line 119 of file amrnbdec.c.

Referenced by decode_pitch_vector(), and synthesis().

◆ fixed_vector

float AMRContext::fixed_vector[AMR_SUBFRAME_SIZE]

algebraic codebook (fixed) vector (must be kept zero between frames)

Definition at line 120 of file amrnbdec.c.

Referenced by amrnb_decode_frame().

◆ prediction_error

float AMRContext::prediction_error[4]

quantified prediction errors {20log10(^gamma_gc)} for previous four subframes

Definition at line 122 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), and amrnb_decode_init().

◆ pitch_gain

float AMRContext::pitch_gain[5]

quantified pitch gains for the current and previous four subframes

Definition at line 123 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), anti_sparseness(), decode_gains(), pitch_sharpening(), synthesis(), and update_state().

◆ fixed_gain

float AMRContext::fixed_gain[5]

quantified fixed gains for the current and previous four subframes

Definition at line 124 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), fixed_gain_smooth(), and update_state().

◆ beta

float AMRContext::beta

previous pitch_gain, bounded by [0.0,SHARP_MAX]

Definition at line 126 of file amrnbdec.c.

Referenced by pitch_sharpening().

◆ diff_count

uint8_t AMRContext::diff_count

the number of subframes for which diff has been above 0.65

Definition at line 127 of file amrnbdec.c.

Referenced by fixed_gain_smooth().

◆ hang_count

uint8_t AMRContext::hang_count

the number of subframes since a hangover period started

Definition at line 128 of file amrnbdec.c.

Referenced by fixed_gain_smooth().

◆ prev_sparse_fixed_gain

float AMRContext::prev_sparse_fixed_gain

previous fixed gain; used by anti-sparseness processing to determine "onset"

Definition at line 130 of file amrnbdec.c.

Referenced by anti_sparseness().

◆ prev_ir_filter_nr

uint8_t AMRContext::prev_ir_filter_nr

previous impulse response filter "impNr": 0 - strong, 1 - medium, 2 - none

Definition at line 131 of file amrnbdec.c.

Referenced by anti_sparseness().

◆ ir_filter_onset

uint8_t AMRContext::ir_filter_onset

flag for impulse response filter strength

Definition at line 132 of file amrnbdec.c.

Referenced by anti_sparseness().

◆ postfilter_mem

float AMRContext::postfilter_mem[10]

previous intermediate values in the formant filter

Definition at line 134 of file amrnbdec.c.

Referenced by postfilter().

◆ tilt_mem

float AMRContext::tilt_mem

previous input to tilt compensation filter

Definition at line 135 of file amrnbdec.c.

Referenced by postfilter().

◆ postfilter_agc

float AMRContext::postfilter_agc

previous factor used for adaptive gain control

Definition at line 136 of file amrnbdec.c.

Referenced by postfilter().

◆ high_pass_mem

float AMRContext::high_pass_mem[2]

previous intermediate values in the high-pass filter

Definition at line 137 of file amrnbdec.c.

Referenced by amrnb_decode_frame().

◆ samples_in

float AMRContext::samples_in[LP_FILTER_ORDER+AMR_SUBFRAME_SIZE]

floating point samples

Definition at line 139 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), postfilter(), and update_state().

◆ acelpf_ctx

ACELPFContext AMRContext::acelpf_ctx

context for filters for ACELP-based codecs

Definition at line 141 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), amrnb_decode_init(), and decode_pitch_vector().

◆ acelpv_ctx

ACELPVContext AMRContext::acelpv_ctx

context for vector operations for ACELP-based codecs

Definition at line 142 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), amrnb_decode_init(), lsf2lsp_3(), lsf2lsp_for_mode12k2(), and synthesis().

◆ celpf_ctx

CELPFContext AMRContext::celpf_ctx

context for filters for CELP-based codecs

Definition at line 143 of file amrnbdec.c.

Referenced by amrnb_decode_init(), postfilter(), synthesis(), and tilt_factor().

◆ celpm_ctx

CELPMContext AMRContext::celpm_ctx

context for fixed point math operations

Definition at line 144 of file amrnbdec.c.

Referenced by amrnb_decode_frame(), amrnb_decode_init(), postfilter(), synthesis(), and tilt_factor().

◆ rawctx

FFRawDemuxerContext AMRContext::rawctx

Definition at line 37 of file amr.c.


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