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http://dev.sourcefabric.org/browse/LS-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19044#action_19044
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Romain Beauxis commented on LS-591:
-----------------------------------
I totally agree that we should look at it and I am interested in taking part of
it.
As for the technicalities, as detailed in my previous email, I believe that we
should start with a lazy decompression strategy based on tracks.
Basically, a stream would not get decompressed until it reaches an operator
that requires it, for instance a crossfade.
Scope for compressed data should be the tracks. If we only consider encoded
tracks, then all the complicated issues related to encoded data overlapping a
frame size and concatenating compressed data go away.
When reaching an output for which the given source has not been decoded and if
the requested encoder matches encoded data from the source, then we should be
able to not decompress/recompress the stream at all.
What we need in order to achieve this is the ability to keep track of the
current position in an encoded stream. Then we should be able to pass encoded
data and update streaming loop according to the corresponding position.
Of course, it would still be possible to get a better encoded scope later, but
I think this plan is the most reasonable to get something working and start
understanding the challenges raised by supporting encoded data.
> Support RAW sources
> -------------------
>
> Key: LS-591
> URL: http://dev.sourcefabric.org/browse/LS-591
> Project: Liquidsoap
> Issue Type: New Feature
> Reporter: Samuel Mimram
> Priority: Major
> Fix For: LONG TERM
>
>
> We should try to have RAW sources (i.e. sources that can contain mp3 / ogg /
> any compressed data). And add some operators for on-demand decoding. Of
> course, this is long-term work, but we could first make a branch with support
> for non-processed raw source (e.g. a playlist of mp3 without transitions) and
> elaborate from there. Do you forsee any big technical difficulty (apart from
> having to bind low-level functions to access compressed streams)?
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