Rockbox mail archiveSubject: Re: Hi & Wavpack broken?
Re: Hi & Wavpack broken?
From: gl <gl_at_ntlworld.com>
good reasons all. I'll look into the problem files today, and also into
Spent a night bonding with the player, and discovering all the amazing
-- gl ----- Original Message ----- From: "David Bryant" <email@example.com> To: "Rockbox development" <firstname.lastname@example.org> Sent: Saturday, February 11, 2006 5:52 AM Subject: Re: Hi & Wavpack broken? >I generally *am* concerned about backwards compatibility, but the older > WavPack formats were not really designed for embedded decoding. Hell, when > WavPack 1.0 was released, a desktop PC couldn't even decode them in > realtime! > > I started WavPack 4.0 essentially from scratch, and designed it from the > ground up to be hardware friendly. While I would never release a winamp > plugin or Audition filter that could not handle a pre-4.0 file, handling > them in embedded applications is optional (as is handling correction files > or mutichannel files) and that's why these were not included in the "tiny" > decoder. > > Handling older WavPack files on RockBox would certainly be possible, but > it > would be a pretty big job and the codec size would jump considerably > (there > were lots of variations and special cases over the years) and > hand-optimizing it would be a chore. And, when it was done, those files > would still not be able to seek or resume, or recover from an error. It > ain't gonna happen... :) > > However, I agree that it should not blow up attempting to play one. The > way > it should work is the codec scans for up to 1 mb into the file for a valid > WavPack 4.0 header. If it doesn't fine one it gives up and returns an > error. > But it might take too long to do that, or something. I suppose that I > could > quickly check for a pre-4.0 file, and bail out right away. That still > would > not help the case where some random file was given a .wv extension, but it > would handle the first case. > > BTW, the first thing I'm going to work on is to get "high" mode WavPack > files playing on the iPod; with any luck it should be just a few days > away. > > ----- Original Message ----- > > From: "gl" <email@example.com> > To: "Rockbox development" <firstname.lastname@example.org> > Sent: Friday, February 10, 2006 8:06 AM > Subject: Re: Hi & Wavpack broken? > > >> >> > Then small wonder, our decoder (a modified version of the tiny decoder >> > from >> > wavpack.com) does not support pre-4.0 files. You'll have to ask David >> > Bryant >> > about how possible it is to support these files. >> >> I'll check with him. He likes to stay backwards compatible. In the >> meantime, those files should be refused. Some seem to be, but others try > to >> play regardless and cause the problem. >> >> > And BTW, 48kHz SPDIF playback is not possible, only 44100/22050/11025. >> >> Right, but 48k input is possible as the clock is external, correct? What >> about 24bit digital in? >> -- >> gl >> >> > >Received on Sat Feb 11 13:27:00 2006
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