Opus-tools: Difference between revisions

Revision as of 15:34, 25 August 2011

Opus-tools is a collection of tools for working with opus files currently under development.

Robust wav input (steal battle tested code from oggenc, e.g. float and multichannel works)
Resampling
bitrate selection
VBR/CBR/CVBR
Application selection (audio/voip)
Mode forcing
Metadata (emulate oggenc feature set)
Multichannel
Muxing delay control (naive usage of libogg will result in 5 second mux delay on silence)
Not needed in initial release:
- Replay gain (but it's important as we want players to actually heed it)
- LPC padding (code for this is very simple, see postfish) but needs some way of setting the prefill inside opus.
- In CELT_ONLY Switch the last frame size to the smallest size that will fit the remaining samples (reduces padding overhead, makes sure mixed sizes get tested)
- crop and/or track split arguments (if data outside of the encoded area is available, use that instead of the LPC padding)
- Exposes all sanely exposable parts of the Opus API (important for testing, even if things are hidden)
- Flac input (?; code for this is in oggenc)

Resampling
Multichannel
metadata display
Wav output
audio playback (libao?) or omit and leave for ogg123
decodes chained files
Not needed for the initial release:
- Lookahead limiter (copy from postfish)
- Dither for 16 bit output

@@ Line 18: / Line 18: @@
 * Not needed in initial release:
 ** Replay gain (but it's important as we want players to actually heed it)
-** LPC padding (code for this is very simple, see postfish)
+** LPC padding (code for this is very simple, see postfish) but needs some way of setting the prefill inside opus.
 ** In CELT_ONLY Switch the last frame size to the smallest size that will fit the remaining samples (reduces padding overhead, makes sure mixed sizes get tested)
 ** crop and/or track split arguments (if data outside of the encoded area is available, use that instead of the LPC padding)