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- [speex]
- ; CBR encoding quality [0..10]
- ; used only when vbr = false
- quality => 3
- ; codec complexity [0..10]
- ; tradeoff between cpu/quality
- complexity => 2
- ; perceptual enhancement [true / false]
- ; improves clarity of decoded speech
- enhancement => true
- ; voice activity detection [true / false]
- ; reduces bitrate when no voice detected, used only for CBR
- ; (implicit in VBR/ABR)
- vad => true
- ; variable bit rate [true / false]
- ; uses bit rate proportionate to voice complexity
- vbr => true
- ; available bit rate [bps, 0 = off]
- ; encoding quality modulated to match this target bit rate
- ; not recommended with dtx or pp_vad - may cause bandwidth spikes
- abr => 0
- ; VBR encoding quality [0-10]
- ; floating-point values allowed
- vbr_quality => 4
- ; discontinuous transmission [true / false]
- ; stops transmitting completely when silence is detected
- ; pp_vad is far more effective but more CPU intensive
- dtx => false
- ; preprocessor configuration
- ; these options only affect Speex v1.1.8 or newer
- ; enable preprocessor [true / false]
- ; allows dsp functionality below but incurs CPU overhead
- preprocess => false
- ; preproc voice activity detection [true / false]
- ; more advanced equivalent of DTX, based on voice frequencies
- pp_vad => false
- ; preproc automatic gain control [true / false]
- pp_agc => false
- pp_agc_level => 8000
- ; preproc denoiser [true / false]
- pp_denoise => false
- ; preproc dereverb [true / false]
- pp_dereverb => false
- pp_dereverb_decay => 0.4
- pp_dereverb_level => 0.3
- [plc]
- ; for all codecs which do not support native PLC
- ; this determines whether to perform generic PLC
- ; there is a minor performance penalty for this
- genericplc => true
- ; Generate custom formats for formats requiring attributes.
- ; After defining the custom format, the name used in defining
- ; the format can be used throughout Asterisk in the format 'allow'
- ; and 'disallow' options.
- ;
- ; Example: silk8 is a predefined custom format in this config file.
- ; Once this config file is loaded, silk8 can be used anywhere a
- ; peer's codec capabilities are defined.
- ;
- ; In sip.conf 'silk8' can be defined as a capability for a peer.
- ; [peer1]
- ; type=peer
- ; host=dynamic
- ; disallow=all
- ; allow=silk8 ;custom codec defined in codecs.conf
- ;
- ; LIMITATIONS
- ; Custom formats can only be defined at startup. Any changes to this
- ; file made after startup will not take into effect until after Asterisk
- ; is restarted.
- ;
- ; Default Custom SILK format definitions, only one custom SILK format per
- ; sample rate is allowed.
- [silk8]
- type=silk
- samprate=8000
- fec=true ; turn on or off encoding with forward error correction.
- ; On recommended, off by default.
- packetloss_percentage=10 ; Estimated packet loss percentage in uplink direction. This
- ; affects how much redundancy is built in when using fec.
- ; The higher the percentage, the larger amount of bandwidth is
- ; used. Default is 0%, 10% is recommended when fec is in use.
- maxbitrate=10000 ; Use the table below to make sure a useful bitrate is choosen
- ; for maxbitrate. If not set or value is not within the bounds
- ; of the encoder, a default value is chosen.
- ;
- ; sample rate | bitrate range
- ; 8khz | 5000 - 20000 bps
- ; 12khz | 7000 - 25000 bps
- ; 16khz | 8000 - 30000 bps
- ; 24khz | 20000- 40000 bps
- ;
- ;dtx=true ; Encode using discontinuous transmission mode or not. Turning this
- ; on will save bandwidth during periods of silence at the cost of
- ; increased computational complexity. Off by default.
- [silk12]
- type=silk
- samprate=12000
- maxbitrate=12000
- fec=true
- packetloss_percentage=10;
- [silk16]
- type=silk
- samprate=16000
- maxbitrate=20000
- fec=true
- packetloss_percentage=10;
- [silk24]
- type=silk
- samprate=24000
- maxbitrate=30000
- fec=true
- packetloss_percentage=10;
- ; Default custom CELT codec definitions. Only one custom CELT definition is allowed
- ; per a sample rate.
- ;[celt44]
- ;type=celt
- ;samprate=44100 ; The samplerate in hz. This option is required.
- ;framesize=480 ; The framesize option represents the duration of each frame in samples.
- ; This must be a factor of 2. This option is only advertised in an SDP
- ; when it is set. Otherwise a default of framesize of 480 is assumed
- ; internally
- ;[celt48]
- ;type=celt
- ;samprate=48000
- ;[celt32]
- ;type=celt
- ;samprate=32000
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