List of Codecs - Audio Codecs - Lossy Data Compression - Voice

Voice

(low bit rate, optimized for speech)

• Advanced Multi-Band Excitation (AMBE)
• Algebraic Code Excited Linear Prediction (ACELP)
• CDMA compression formats and codecs
  • Enhanced Variable Rate Codec (EVRC)
  • Enhanced Variable Rate Codec B (EVRC-B)
  • QCELP (Qualcomm Code Excited Linear Prediction)
    • FFmpeg (decoder only)
  • Selectable Mode Vocoder (SMV)
  • Variable Multi Rate – WideBand (VMR-WB)
• CELT
  • libcelt
• Code Excited Linear Prediction (CELP)
• Continuously variable slope delta modulation (CVSD)
• Dialogic ADPCM (VOX)
• Digital Speech Standard (DSS)
• FS-1015 (LPC-10)
  • HawkVoice (libHVDI)
• FS-1016 (CELP)
  • HawkVoice (libHVDI)
• ITU standards:
  • G.711 (a-law and μ-law companding), also known as PCM of voice frequencies
    • FFmpeg (libavcodec)
  • G.711.0 (G.711 LLC)
  • G.711.1
  • G.718
  • G.719
  • G.721 (superseded by G.726)
  • G.722
    • FFmpeg
  • G.722.1
  • G.722.2 (AMR-WB)
    • 3GPP TS 26.173 - AMR-WB speech Codec (C-source code) - reference implementation
    • opencore-amr (decoder)
    • FFmpeg (decoder only)
  • G.723 (24 and 40 kbit/s DPCM, extension to G.721, superseded by G.726)
  • G.723.1 (MPC-MLQ or ACELP)
    • FFmpeg
  • G.726 (ADPCM)
    • FFmpeg (libavcodec)
  • G.728 (LD-CELP)
  • G.729 (CS-ACELP)
    • FFmpeg (decoder only)
  • G.729a
  • G.729d
    • FFmpeg (decoder only)
  • G.729.1
• GSM compression formats and codecs:
  • Full Rate (GSM 06.10)
    • libgsm
    • FFmpeg (decoder only)
  • Half Rate (GSM 06.20)
  • Enhanced Full Rate (GSM 06.60)
  • Adaptive Multi-Rate (AMR)
    • AMR-NB
      • 3GPP TS 26.073 - AMR speech Codec (C-source code) - reference implementation
      • opencore-amr (one may compile ffmpeg with --enable-libopencore-amrnb to incorporate the OpenCORE lib)
      • FFmpeg (by default decoder only, but see above the compiling options to incorporate the OpenCORE lib).
    • AMR-WB
      • 3GPP TS 26.173 - AMR-WB speech Codec (C-source code) - reference implementation
      • opencore-amr (decoder), from OpenCORE (one may compile ffmpeg with --enable-libopencore-amrwb to incorporate the OpenCORE lib)
      • vo-amrwbenc (encoder), from Android VisualOn (one may compile ffmpeg with --enable-libvo-amrwbenc to incorporate the VisualOn lib)
      • FFmpeg (by default decoder only, but see above the compiling options).
    • AMR-WB+
      • 3GPP TS 26.273 - AMR-WB+ speech Codec (C-source code) - reference implementation
• Harmonic Vector Excitation Coding (HVXC)
• Internet Low Bit Rate Codec (iLBC)
  • WebRTC
• Improved Multi-Band Excitation (IMBE)
• internet Speech Audio Codec (iSAC)
  • WebRTC
• IP-MR used by SPIRIT DSP and many others
• Mixed Excitation Linear Prediction (MELP)
• Nellymoser Asao Codec
  • FFmpeg (libavcodec)
• Opus
• PT716, PT716plus
• PT724
• RALCWI (Robust Advanced Low Complexity Waveform Interpolation)
• Relaxed Code Excited Linear Prediction (RCELP)
• RTAudio - used by Microsoft Live Communication Server
• SILK - used by Skype
• Speex, patent free
  • libspeex
• SVOPC - used by Skype
• Triple Rate CODER (TRC) - used in some pocket recorders.
• Vector Sum Excited Linear Prediction (VSELP)
• OpenLPC
  • HawkVoice (libHVDI)
• Voxware VR12 - used by Microsoft DirectPlay
• Voxware SC03 - used by Microsoft DirectPlay
• Voxware SC06 - used by Microsoft DirectPlay
• Truespeech
  • FFmpeg (decoder only)