Rockbox

  • Status Closed
  • Percent Complete
    100%
  • Task Type Patches
  • Category Video
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version Daily build (which?)
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by Michael Sevakis - 2007-12-26
Last edited by Michael Sevakis - 2007-12-29

FS#8374 - Fully frame-accurate seekable playback engine for mpegplayer

This implements a playback engine with frame-accurate seeking for mpegplayer (in all streams). The UI portion for seeking during playback is not included (that's the next step after a commit) but the underlying machinery will do that. The time resolution of the current resume screen is now 1-second with 1-minute coarse browsing available on all targets.

Startup and resume should be much faster since the disk buffer is implemented as a direct-mapped file cache for random access. Addition of the UI will be rather simple with the drawing of rotated text on portrait displays being the most difficult aspect but doable.

To note: Encode with frequent GOPs (1 second or less which is the usual case). These are the random access units and guarantee a keypoint for random access. Encoding with GOPs 100s of pictures long (I have files from someone that are encoded this way) is never a good idea if you want rapid random access to a particular point in the file. Right now it doesn't give up trying to find GOPs if they're too far away. Whether that matters very much definitely depends on processor power since winding a couple-hundred frames from a keypoint to the proper frame really doesn't matter much on a gigabeat. :) That's tweakable later anyway.

Poke at it and do tell…I want to commit soon. Minor tweaks aren't the concern here. I'd like to unload it before doing deeper stuff.

EDIT: I do need to straigten out the Copyright parts in the headers. I just pasted mine in all the new files just to have the Rockbox header.

Closed by  Michael Sevakis
2007-12-29 20:25
Reason for closing:  Out of Date
Additional comments about closing:  

Further updated patch added to SVN. Final work to make seeking fully useable to begin soon.

Michael Sevakis commented on 2007-12-26 20:12

V2 - forgot svn add on a file. I hope that's all of them :)

Michael Sevakis commented on 2007-12-28 03:23

Add some support for mpv and m2v elementary video stream files since there's not much to it. Seeking is not enabled for them since no time information exists and I'm not sure if a 0-100% mode would work nicely or not. To get time info a full file scan is needed which could be annoying. No big deal for now.

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