FFmpeg audio API: Difference between revisions
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This page is for discussion regarding the reworking of the FFmpeg audio API to accommodate the requirements needed for today's audio codecs. | |||
== Features needed == | == Features needed == | ||
* Generalized downmixing ( | * Generalized downmixing (SIMD optimized) | ||
Users should be able to set their own downmix coeffs. | Users should be able to set their own downmix coeffs. | ||
* Codec setable downmixing coeffs: | * Codec setable downmixing coeffs: | ||
| Line 14: | Line 14: | ||
* Ability to access one channel from a multichannel stream | * Ability to access one channel from a multichannel stream | ||
== | == Features wish list == | ||
* Add a better | * Add a better FFT routine. (Would the KISS implementation be a good candidate?) | ||
* | * Fixed point MDCT/FFT implementations | ||
* Custom | * Custom audio filter support. (Basing it on the video filter API ideas?) | ||
== Current ideas == | == Current ideas == | ||
Thread with previous discussions in the subject. The thread has several ideas already implemented. | Thread with previous discussions in the subject. The thread has several ideas already implemented. | ||
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/47485/focus=48097 | http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/47485/focus=48097 | ||
Revision as of 10:44, 12 November 2007
This page is for discussion regarding the reworking of the FFmpeg audio API to accommodate the requirements needed for today's audio codecs.
Features needed
- Generalized downmixing (SIMD optimized)
Users should be able to set their own downmix coeffs.
- Codec setable downmixing coeffs:
The codec should be able to set and update the coefs during runtime(dca supports that feature, maybe ac3 also).
- Output channel request function (ie, request a specified number of channels, default should be >2 channels mapped to 2 channels).
- Channel reordering, currently there are diffrent orders depending on the codec.
- Simd optimized interleaving
- Allow planer output, (don't duplicate interleaving code in every codec)
- Add support for other bitdepths then 16bits (ie 24/8/32/float)
- Ability to access one channel from a multichannel stream
Features wish list
- Add a better FFT routine. (Would the KISS implementation be a good candidate?)
- Fixed point MDCT/FFT implementations
- Custom audio filter support. (Basing it on the video filter API ideas?)
Current ideas
Thread with previous discussions in the subject. The thread has several ideas already implemented.
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/47485/focus=48097