• 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
Makefile 63.1 KB