OpusTodo

From XiphWiki

(Difference between revisions)
Jump to: navigation, search
(Opus-tools: Document some getting-started goals for opusrtp)
Line 20: Line 20:
== Opus-tools ==
== Opus-tools ==
* A simple real time streaming example tool
* A simple real time streaming example tool
 +
** Start with opusrtp.c in [https://git.xiph.org/?p=opus-tools.git opus-tools]
 +
** Make <code>opusrtp rtp://example.com:5431/</code> listen to that host and port and mux packets from there. Generalize the cpac bases --sniff implementation
 +
** Make sending similarly generic. Maybe just <code>opusrtp source.opus -o rtp://example.com:5431/</code> to send source.opus out to the destination?
 +
** Make --sniff save one file per
 +
** Implement DTLS-SRTP. See webrtc.
 +
** audio capture/encode, decode/playback?
 +
** Parse and act on sdp for convenience and testing.
 +
* Replaygain (half done— needs a gain tool)
* Replaygain (half done— needs a gain tool)

Revision as of 17:53, 21 June 2013

Contents

1.1-beta

  • Vary tf_analysis end band based on complexity
  • Use pitch down to complexity 4 instead of 5?
  • Testing

Spec

Website

  • De-uglify webpage - some suggestions: write about codecs obsoleted by OPUS (Speex, CELT, Vorbis(?), and the prop. ones), write about implementations (is there only one so far?), comparison table (Opus, Vorbis, Speex, ..., MP5) of features (channels, freq, bits per sample, license, language (C89), integer impl. (Vorbis decoder only, Opus YES, ...), future use in video files (Theora? Dirac? WebM? other future codecs...), audio files for storage (like Vorbis, no raw Opus defined, only inside OGG), ...
  • Promotional material (some nice free or Public domain sounds in Opus format)

Other

  • Oggz-validate (should also validate opus toc)

Opus-tools

  • A simple real time streaming example tool
    • Start with opusrtp.c in opus-tools
    • Make opusrtp rtp://example.com:5431/ listen to that host and port and mux packets from there. Generalize the cpac bases --sniff implementation
    • Make sending similarly generic. Maybe just opusrtp source.opus -o rtp://example.com:5431/ to send source.opus out to the destination?
    • Make --sniff save one file per
    • Implement DTLS-SRTP. See webrtc.
    • audio capture/encode, decode/playback?
    • Parse and act on sdp for convenience and testing.
  • Replaygain (half done— needs a gain tool)

Surround work

  • Apply spreading to energy masking
  • More conservative energy masking (not just mean difference) and dynalloc
  • Allow SILK/hybrid on center channel for voice?

Psychoacoustic stuff

  • Adaptive width narrowing and forced intensity stereo bands

Experiments

  • Test exp_analysis and void_my_warranty.patch

Optimisations

  • Vectorising comb_filter()
  • Use 16-bit mul plus shift in denormalise_bands()
  • Optimise MDCT somehow
  • Merge ARM optimisations

Future work

  • psymodel based VBR
  • Remove copy in inverse MDCT
  • Save some float<->int conversions
  • Improvements to LP mode CBR (greg has some code)
  • Better handling for the case where FEC has a different bandwidth than the current mode
  • PLC transitions on unprotected SILK-SILK bandwidth changes?
  • Figure out how to use speech/music detection optimally
    • find optimal switching time (low energy/tonality)
  • Improve variable frame size
Personal tools


Main Page

Xiph.Org Projects

Audio—

Video—

Text—

Container—

Streaming—