1. 20 Mar, 2017 5 commits
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  8. 14 Feb, 2017 2 commits
    • Rostislav Pehlivanov's avatar
      opus: add a native Opus encoder · 5f47c85e
      Rostislav Pehlivanov authored
      This marks the first time anyone has written an Opus encoder without
      using any libopus code. The aim of the encoder is to prove how far
      the format can go by writing the craziest encoder for it.
      
      Right now the encoder's basic, it only supports CBR encoding, however
      internally every single feature the CELT layer has is implemented
      (except the pitch pre-filter which needs to work well with the rest of
      whatever gets implemented). Psychoacoustic and rate control systems are
      under development.
      
      The encoder takes in frames of 120 samples and depending on the value of
      opus_delay the plan is to use the extra buffered frames as lookahead.
      Right now the encoder will pick the nearest largest legal frame size and
      won't use the lookahead, but that'll change once there's a
      psychoacoustic system.
      
      Even though its a pretty basic encoder its already outperforming
      any other native encoder FFmpeg has by a huge amount.
      
      The PVQ search algorithm is faster and more accurate than libopus's
      algorithm so the encoder's performance is close to that of libopus
      at zero complexity (libopus has more SIMD).
      The algorithm might be ported to libopus or other codecs using PVQ in
      the future.
      
      The encoder still has a few minor bugs, like desyncs at ultra low
      bitrates (below 9kbps with 20ms frames).
      Signed-off-by: 's avatarRostislav Pehlivanov <atomnuker@gmail.com>
      5f47c85e
    • Rostislav Pehlivanov's avatar
      imdct15: rename to mdct15 and add a forward transform · d2119f62
      Rostislav Pehlivanov authored
      Handles strides (needed for Opus transients), does pre-reindexing and folding
      without needing a copy.
      Signed-off-by: 's avatarRostislav Pehlivanov <atomnuker@gmail.com>
      d2119f62
  9. 08 Feb, 2017 2 commits
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