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Diffstat (limited to 'doc/README.tech')
| -rw-r--r-- | doc/README.tech | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/doc/README.tech b/doc/README.tech index e110b3a960..a963992184 100644 --- a/doc/README.tech +++ b/doc/README.tech @@ -27,20 +27,23 @@ Video: vectors. Currently, only fcode = 1 is used for both H263/MPEG1. Half pel vectors are used. -I also plan to improve the bitrate control which is too simplistic. - Audio: ----- -- I rewrote the mpeg audio layer 2 compatible encoder from scratch. It - is one of the simplest encoder you can imagine (800 lines of C code - !). It is also one of the fastest because of its simplicity. There - are still some problems of overflow. A minimal psycho acoustic model - could be added. Currently, stereo is supported, but not joint - stereo. +- The mpeg audio layer 2 compatible encoder was rewritten from + scratch. It is one of the simplest encoder you can imagine (800 + lines of C code !). It is also one of the fastest because of its + simplicity. There are still some problems of overflow. A minimal + psycho acoustic model could be added. Currently, stereo is + supported, but not joint stereo. -- I rewrote the AC3 audio encoder from scratch. It is fairly naive, - but the result are quiet interesting at 64 kbit/s. It includes - extensions for low sampling rates used in some Internet +- The AC3 audio encoder was rewritten from scratch. It is fairly + naive, but the result are quiet interesting at 64 kbit/s. It + includes extensions for low sampling rates used in some Internet formats. Differential and coupled stereo is not handled. Stereo channels are simply handled as two mono channels. + +- The mpeg audio layer 3 decoder was rewritten from scratch. It uses + only integers and can be 16 bit precision for the synthesis filter + at the expense of a slight precision loss. A slower bit exact mode + is available too for compliance testing. |