sout: implement a SetPCR callback in stream output

For a more global context on these changes, please have a look at #27050.

This is the first step for the SetPCR implementation in stream output. These callbacks will allow stream outputs to have precise information about the stream time advancement.

This merge request only provides the basis for now, a correct implementation for all stream filters will come in a separate merge request.

requested review from @typx

assigned to @tguillem

assigned to @fcartegnie and unassigned @tguillem

pipeline, we decided to create a core API to deal with this specific problematic (vlc_pcr_delayer: see

Not fan of the naming. You're not delaying, you're expecting data before some deadline or synthesize one value.

added 7 commits

• 85434ef5 - sout: add `set_pcr` callback
• 8774fefa - sout: add SetPCR API wrapper
• 22039d55 - sout: input: wrap sout_StreamSetPCR for sout_Input
• 6b62ac22 - core: add vlc_pcr_sync API
• 77e5ace7 - decoder: add `on_block_sent` decoder callback
• 75ed2793 - es_out: implement PCR forwarding to sout
• 6e807145 - transcode: implement SetPCR

Compare with previous version

changed the description