FFmpeg audio API: Difference between revisions

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(Extraction of single channels in multichannel streams)
(Previous ideas)
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* Add a better fft routine, maybe the KISS one
* Add a better fft routine, maybe the KISS one
* Fixedpoint mdct/fft functions
* Fixedpoint mdct/fft functions
== Current ideas ==
Thread with previous discussions in the subject.
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/47485/focus=48097

Revision as of 08:46, 12 November 2007

Discussion page regarding the rework of the ffmpeg audio api to acomodate the requirements needed for todays audio codecs.

Features needed

  • Generalized downmixing (simd optimized)
  • Codec settable downmixing coeffs, (dca and ac3 supports that, maybe other codecs also, could also be user defined)
  • Output channel request function (ie, request a specified number of channels, default should be >2 mapped to 2 channels)
  • Channel reordering, currently there are diffrent orders depending on the codec.
  • Optimized interleaving
  • Allow planer output, (don't duplicate interleaving code in every codec)
  • Add support for other bitdepths then 16bits
  • Ability to access one channel from a multichannel stream

Whished for features

  • Add a better fft routine, maybe the KISS one
  • Fixedpoint mdct/fft functions


Current ideas

Thread with previous discussions in the subject.

http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/47485/focus=48097