Data Fields | |
Global values specified in the stream header / extradata or used all over. | |
| GetBitContext | gb |
| packet bitreader. | |
| int8_t | vbm_tree [25] |
| converts VLC codes to frame type | |
| int | spillover_bitsize |
| number of bits used to specify spillover_nbits in the packet header = ceil(log2(ctx->block_align << 3)) | |
| int | history_nsamples |
| number of samples in history for signal prediction (through ACB) | |
| int | do_apf |
| whether to apply the averaged projection filter (APF) | |
| int | denoise_strength |
| strength of denoising in Wiener filter [0-11] | |
| int | denoise_tilt_corr |
| Whether to apply tilt correction to the Wiener filter coefficients (postfilter). | |
| int | dc_level |
| Predicted amount of DC noise, based on which a DC removal filter is used. | |
| int | lsps |
| number of LSPs per frame [10 or 16] | |
| int | lsp_q_mode |
| defines quantizer defaults [0, 1] | |
| int | lsp_def_mode |
| defines different sets of LSP defaults [0, 1] | |
| int | frame_lsp_bitsize |
| size (in bits) of LSPs, when encoded per-frame (independent coding) | |
| int | sframe_lsp_bitsize |
| size (in bits) of LSPs, when encoded per superframe (residual coding) | |
| int | min_pitch_val |
| base value for pitch parsing code | |
| int | max_pitch_val |
| max value + 1 for pitch parsing | |
| int | pitch_nbits |
| number of bits used to specify the pitch value in the frame header | |
| int | block_pitch_nbits |
| number of bits used to specify the first block's pitch value | |
| int | block_pitch_range |
| range of the block pitch | |
| int | block_delta_pitch_nbits |
| number of bits used to specify the delta pitch between this and the last block's pitch value, used in all but first block | |
| int | block_delta_pitch_hrange |
| 1/2 range of the delta (full range is from -this to +this-1) | |
| uint16_t | block_conv_table [4] |
| boundaries for block pitch unit/scale conversion | |
Packet values specified in the packet header or related to a packet. | |
A packet is considered to be a single unit of data provided to this decoder by the demuxer. | |
| int | spillover_nbits |
| number of bits of the previous packet's last superframe preceeding this packet's first full superframe (useful for re-synchronization also) | |
| int | has_residual_lsps |
| if set, superframes contain one set of LSPs that cover all frames, encoded as independent and residual LSPs; if not set, each frame contains its own, fully independent, LSPs | |
| int | skip_bits_next |
| number of bits to skip at the next call to wmavoice_decode_packet() (since they're part of the previous superframe) | |
| uint8_t | sframe_cache [SFRAME_CACHE_MAXSIZE+FF_INPUT_BUFFER_PADDING_SIZE] |
| cache for superframe data split over multiple packets | |
| int | sframe_cache_size |
| set to >0 if we have data from an (incomplete) superframe from a previous packet that spilled over in the current packet; specifies the amount of bits in sframe_cache | |
| PutBitContext | pb |
| bitstream writer for sframe_cache | |
Frame and superframe values | |
Superframe and frame data - these can change from frame to frame, although some of them do in that case serve as a cache / history for the next frame or superframe. | |
| double | prev_lsps [MAX_LSPS] |
| LSPs of the last frame of the previous superframe. | |
| int | last_pitch_val |
| pitch value of the previous frame | |
| int | last_acb_type |
| frame type [0-2] of the previous frame | |
| int | pitch_diff_sh16 |
| ((cur_pitch_val - last_pitch_val) << 16) / MAX_FRAMESIZE | |
| float | silence_gain |
| set for use in blocks if ACB_TYPE_NONE | |
| int | aw_idx_is_ext |
| whether the AW index was encoded in 8 bits (instead of 6) | |
| int | aw_pulse_range |
| the range over which aw_pulse_set1() can apply the pulse, relative to the value in aw_first_pulse_off. | |
| int | aw_n_pulses [2] |
| number of AW-pulses in each block; note that this number can be negative (in which case it basically means "zero") | |
| int | aw_first_pulse_off [2] |
| index of first sample to which to apply AW-pulses, or -0xff if unset | |
| int | aw_next_pulse_off_cache |
| the position (relative to start of the second block) at which pulses should start to be positioned, serves as a cache for pitch-adaptive window pulses between blocks | |
| int | frame_cntr |
| current frame index [0 - 0xFFFE]; is only used for comfort noise in pRNG() | |
| float | gain_pred_err [6] |
| cache for gain prediction | |
| float | excitation_history [MAX_SIGNAL_HISTORY] |
| cache of the signal of previous superframes, used as a history for signal generation | |
| float | synth_history [MAX_LSPS] |
| see excitation_history | |
Postfilter values | |
Variables used for postfilter implementation, mostly history for smoothing and so on, and context variables for FFT/iFFT. | |
| RDFTContext | rdft |
| RDFTContext | irdft |
| contexts for FFT-calculation in the postfilter (for denoise filter) | |
| DCTContext | dct |
| DCTContext | dst |
| contexts for phase shift (in Hilbert transform, part of postfilter) | |
| float | sin [511] |
| float | cos [511] |
| 8-bit cosine/sine windows over [-pi,pi] range | |
| float | postfilter_agc |
| gain control memory, used in adaptive_gain_control() | |
| float | dcf_mem [2] |
| DC filter history. | |
| float | zero_exc_pf [MAX_SIGNAL_HISTORY+MAX_SFRAMESIZE] |
| zero filter output (i.e. | |
| float | denoise_filter_cache [MAX_FRAMESIZE] |
| int | denoise_filter_cache_size |
| samples in denoise_filter_cache | |
| float | tilted_lpcs_pf [0x80] |
| aligned buffer for LPC tilting | |
| float | denoise_coeffs_pf [0x80] |
| aligned buffer for denoise coefficients | |
| float | synth_filter_out_buf [0x80+MAX_LSPS_ALIGN16] |
| aligned buffer for postfilter speech synthesis | |
Definition at line 129 of file wmavoice.c.
index of first sample to which to apply AW-pulses, or -0xff if unset
Definition at line 241 of file wmavoice.c.
Referenced by aw_parse_coords(), aw_pulse_set1(), and aw_pulse_set2().
whether the AW index was encoded in 8 bits (instead of 6)
Definition at line 230 of file wmavoice.c.
Referenced by aw_parse_coords(), and aw_pulse_set1().
| int WMAVoiceContext::aw_n_pulses[2] |
number of AW-pulses in each block; note that this number can be negative (in which case it basically means "zero")
Definition at line 238 of file wmavoice.c.
Referenced by aw_parse_coords(), aw_pulse_set1(), and aw_pulse_set2().
the position (relative to start of the second block) at which pulses should start to be positioned, serves as a cache for pitch-adaptive window pulses between blocks
Definition at line 243 of file wmavoice.c.
Referenced by aw_pulse_set2().
the range over which aw_pulse_set1() can apply the pulse, relative to the value in aw_first_pulse_off.
The exact position of the first AW-pulse is within [pulse_off, pulse_off + this], and depends on bitstream values; [16 or 24]
Definition at line 232 of file wmavoice.c.
Referenced by aw_parse_coords(), aw_pulse_set1(), and aw_pulse_set2().
| uint16_t WMAVoiceContext::block_conv_table[4] |
boundaries for block pitch unit/scale conversion
Definition at line 178 of file wmavoice.c.
Referenced by synth_frame(), and wmavoice_decode_init().
1/2 range of the delta (full range is from -this to +this-1)
Definition at line 176 of file wmavoice.c.
Referenced by synth_frame(), and wmavoice_decode_init().
number of bits used to specify the delta pitch between this and the last block's pitch value, used in all but first block
Definition at line 172 of file wmavoice.c.
Referenced by check_bits_for_superframe(), synth_frame(), and wmavoice_decode_init().
number of bits used to specify the first block's pitch value
Definition at line 169 of file wmavoice.c.
Referenced by check_bits_for_superframe(), synth_frame(), and wmavoice_decode_init().
range of the block pitch
Definition at line 171 of file wmavoice.c.
Referenced by synth_frame(), and wmavoice_decode_init().
| float WMAVoiceContext::cos[511] |
8-bit cosine/sine windows over [-pi,pi] range
Definition at line 270 of file wmavoice.c.
Referenced by calc_input_response(), and wmavoice_decode_init().
Predicted amount of DC noise, based on which a DC removal filter is used.
Definition at line 153 of file wmavoice.c.
Referenced by postfilter(), and wmavoice_decode_init().
| float WMAVoiceContext::dcf_mem[2] |
DC filter history.
Definition at line 274 of file wmavoice.c.
Referenced by postfilter(), and wmavoice_flush().
Definition at line 268 of file wmavoice.c.
Referenced by calc_input_response(), wmavoice_decode_end(), and wmavoice_decode_init().
| float WMAVoiceContext::denoise_coeffs_pf[0x80] |
aligned buffer for denoise coefficients
Definition at line 283 of file wmavoice.c.
Referenced by wiener_denoise().
| float WMAVoiceContext::denoise_filter_cache[MAX_FRAMESIZE] |
samples in denoise_filter_cache
Definition at line 279 of file wmavoice.c.
Referenced by wiener_denoise().
strength of denoising in Wiener filter [0-11]
Definition at line 149 of file wmavoice.c.
Referenced by calc_input_response(), and wmavoice_decode_init().
Whether to apply tilt correction to the Wiener filter coefficients (postfilter).
Definition at line 151 of file wmavoice.c.
Referenced by calc_input_response(), and wmavoice_decode_init().
whether to apply the averaged projection filter (APF)
Definition at line 147 of file wmavoice.c.
Referenced by synth_frame(), synth_superframe(), wmavoice_decode_end(), wmavoice_decode_init(), and wmavoice_flush().
contexts for phase shift (in Hilbert transform, part of postfilter)
Definition at line 268 of file wmavoice.c.
Referenced by calc_input_response(), wmavoice_decode_end(), and wmavoice_decode_init().
| float WMAVoiceContext::excitation_history[MAX_SIGNAL_HISTORY] |
cache of the signal of previous superframes, used as a history for signal generation
Definition at line 253 of file wmavoice.c.
Referenced by synth_superframe(), and wmavoice_flush().
current frame index [0 - 0xFFFE]; is only used for comfort noise in pRNG()
Definition at line 249 of file wmavoice.c.
Referenced by synth_block_hardcoded(), and synth_frame().
size (in bits) of LSPs, when encoded per-frame (independent coding)
Definition at line 160 of file wmavoice.c.
Referenced by check_bits_for_superframe(), and wmavoice_decode_init().
| float WMAVoiceContext::gain_pred_err[6] |
cache for gain prediction
Definition at line 251 of file wmavoice.c.
Referenced by synth_block_fcb_acb(), synth_block_hardcoded(), and wmavoice_flush().
packet bitreader.
During decoder init, it contains the extradata from the demuxer. During decoding, it contains packet data.
Definition at line 134 of file wmavoice.c.
Referenced by parse_packet_header(), synth_superframe(), wmavoice_decode_init(), and wmavoice_decode_packet().
if set, superframes contain one set of LSPs that cover all frames, encoded as independent and residual LSPs; if not set, each frame contains its own, fully independent, LSPs
Definition at line 194 of file wmavoice.c.
Referenced by check_bits_for_superframe(), parse_packet_header(), and synth_superframe().
number of samples in history for signal prediction (through ACB)
Definition at line 143 of file wmavoice.c.
Referenced by synth_frame(), synth_superframe(), wmavoice_decode_init(), and wmavoice_flush().
contexts for FFT-calculation in the postfilter (for denoise filter)
Definition at line 266 of file wmavoice.c.
Referenced by calc_input_response(), wiener_denoise(), wmavoice_decode_end(), and wmavoice_decode_init().
frame type [0-2] of the previous frame
Definition at line 225 of file wmavoice.c.
Referenced by synth_frame(), and wmavoice_decode_init().
pitch value of the previous frame
Definition at line 224 of file wmavoice.c.
Referenced by synth_block_fcb_acb(), synth_frame(), and wmavoice_decode_init().
defines different sets of LSP defaults [0, 1]
Definition at line 158 of file wmavoice.c.
Referenced by synth_superframe(), and wmavoice_decode_init().
defines quantizer defaults [0, 1]
Definition at line 157 of file wmavoice.c.
Referenced by synth_superframe(), and wmavoice_decode_init().
number of LSPs per frame [10 or 16]
Definition at line 156 of file wmavoice.c.
Referenced by postfilter(), synth_block(), synth_frame(), synth_superframe(), wiener_denoise(), wmavoice_decode_init(), and wmavoice_flush().
max value + 1 for pitch parsing
Definition at line 166 of file wmavoice.c.
Referenced by kalman_smoothen(), synth_frame(), and wmavoice_decode_init().
base value for pitch parsing code
Definition at line 165 of file wmavoice.c.
Referenced by kalman_smoothen(), synth_frame(), and wmavoice_decode_init().
bitstream writer for sframe_cache
Definition at line 211 of file wmavoice.c.
Referenced by wmavoice_decode_packet().
((cur_pitch_val - last_pitch_val) << 16) / MAX_FRAMESIZE
Definition at line 226 of file wmavoice.c.
Referenced by synth_block_fcb_acb(), and synth_frame().
number of bits used to specify the pitch value in the frame header
Definition at line 167 of file wmavoice.c.
Referenced by check_bits_for_superframe(), synth_frame(), and wmavoice_decode_init().
gain control memory, used in adaptive_gain_control()
Definition at line 272 of file wmavoice.c.
Referenced by postfilter(), and wmavoice_flush().
| double WMAVoiceContext::prev_lsps[MAX_LSPS] |
LSPs of the last frame of the previous superframe.
Definition at line 222 of file wmavoice.c.
Referenced by synth_superframe(), wmavoice_decode_init(), and wmavoice_flush().
Definition at line 266 of file wmavoice.c.
Referenced by calc_input_response(), wiener_denoise(), wmavoice_decode_end(), and wmavoice_decode_init().
| uint8_t WMAVoiceContext::sframe_cache[SFRAME_CACHE_MAXSIZE+FF_INPUT_BUFFER_PADDING_SIZE] |
cache for superframe data split over multiple packets
Definition at line 204 of file wmavoice.c.
Referenced by synth_superframe(), and wmavoice_decode_packet().
set to >0 if we have data from an (incomplete) superframe from a previous packet that spilled over in the current packet; specifies the amount of bits in sframe_cache
Definition at line 206 of file wmavoice.c.
Referenced by synth_superframe(), wmavoice_decode_packet(), and wmavoice_flush().
size (in bits) of LSPs, when encoded per superframe (residual coding)
Definition at line 162 of file wmavoice.c.
Referenced by check_bits_for_superframe(), and wmavoice_decode_init().
set for use in blocks if ACB_TYPE_NONE
Definition at line 228 of file wmavoice.c.
Referenced by synth_block_hardcoded(), and synth_frame().
| float WMAVoiceContext::sin[511] |
Definition at line 270 of file wmavoice.c.
Referenced by calc_input_response(), and wmavoice_decode_init().
number of bits to skip at the next call to wmavoice_decode_packet() (since they're part of the previous superframe)
Definition at line 199 of file wmavoice.c.
Referenced by wmavoice_decode_packet(), and wmavoice_flush().
number of bits used to specify spillover_nbits in the packet header = ceil(log2(ctx->block_align << 3))
Definition at line 140 of file wmavoice.c.
Referenced by parse_packet_header(), and wmavoice_decode_init().
number of bits of the previous packet's last superframe preceeding this packet's first full superframe (useful for re-synchronization also)
Definition at line 190 of file wmavoice.c.
Referenced by parse_packet_header(), and wmavoice_decode_packet().
| float WMAVoiceContext::synth_filter_out_buf[0x80+MAX_LSPS_ALIGN16] |
aligned buffer for postfilter speech synthesis
Definition at line 285 of file wmavoice.c.
Referenced by postfilter(), and wmavoice_flush().
| float WMAVoiceContext::synth_history[MAX_LSPS] |
| float WMAVoiceContext::tilted_lpcs_pf[0x80] |
aligned buffer for LPC tilting
Definition at line 281 of file wmavoice.c.
Referenced by wiener_denoise().
| int8_t WMAVoiceContext::vbm_tree[25] |
converts VLC codes to frame type
Definition at line 138 of file wmavoice.c.
Referenced by check_bits_for_superframe(), synth_frame(), and wmavoice_decode_init().
| float WMAVoiceContext::zero_exc_pf[MAX_SIGNAL_HISTORY+MAX_SFRAMESIZE] |
zero filter output (i.e.
excitation) by postfilter
Definition at line 276 of file wmavoice.c.
Referenced by synth_frame(), synth_superframe(), and wmavoice_flush().
1.5.8