| --- Log opened Thu Feb 03 00:00:19 2011 |
| 00:12 | | Kindamoody is now known as Kindamoody[zZz] |
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| 00:30 | < Reiv> | So, fun little puzzle |
| 00:30 | < Reiv> | I have a 1 hour .mp3 file. |
| 00:31 | < Reiv> | I also have a .cue file containing all its tracks. |
| 00:31 | < Reiv> | How the heck do I render these things into something useful? |
| 00:38 | <@ToxicFrog> | Um |
| 00:39 | <@ToxicFrog> | The easy answer is "re-rip from the original image that the cue file is linked to" |
| 00:39 | | * celticminstrel created a custom dict that binds to a database table. <_< |
| 00:39 | < Reiv> | See that's what I thought |
| 00:39 | < Reiv> | Except that the .mp3 is the image ;_; |
| 00:40 | | * Reiv needs to pay more attention to the contents of his files ?? |
| 00:44 | <@ToxicFrog> | ....how did that happen |
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| 01:13 | < gnolam> | Define "render into something useful". |
| 01:14 | < gnolam> | If it's splitting it you want, ffmpeg does the job nicely. |
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| 01:27 | < Reiv> | gnolam: Awesome, cheres |
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| 01:33 | | * Reiv eyes ffmpeg with the suspicious and ignorant eyes of a windows user. |
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| 01:38 | < gnolam> | Reiv: ffmpeg -acodec copy -i [input filename] -ss hh:mm:ss[.xxx] -t hh:mm:ss[.xxx] [output filename] |
| 01:38 | < gnolam> | Where the -ss argument is the starting time and the -t argument the duration. |
| 01:39 | < Reiv> | Fascinating. |
| 01:39 | < Reiv> | Where am I typing that in?~ |
| 01:39 | < Reiv> | Also that seems to demand I do it manually. Which I guess I can do; I was just hoping there was something out there that would chop up an mp3 into bitesized bits based on a cue file. |
| 01:45 | <@ToxicFrog> | Should be shellscriptable, cue files are plaintext |
| 01:45 | <@ToxicFrog> | Oh wait |
| 01:45 | <@ToxicFrog> | Windows |
| 01:45 | <@McMartin> | batchfileable. |
| 01:47 | <@ToxicFrog> | What sort of text processing tools does windows come with? I was thinking of something like awk foo.cue | while read start end; ffmpeg |
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| 01:47 | < Reiv> | Well, windows 7 might do more than most |
| 01:48 | < Reiv> | But I can't really say beyond that >_> |
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| 02:08 | <@McMartin> | PowerShell is apparently insanely powerful, but I know nowt of it |
| 02:09 | <@McMartin> | That said, an awful lot of Windows prefab machines ship with Python these days, as it powers HP's shovelware |
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| 05:12 | <@ToxicFrog> | Oh dear. |
| 05:12 | | * ToxicFrog assigns a grade of 4/15 |
| 05:17 | < Vornicus> | Another of the 50-gate wonders? |
| 05:22 | <@ToxicFrog> | No, just someone who clearly Does Not Understand K-maps. |
| 05:22 | <@ToxicFrog> | Which is unfortunate since this assignment is entirely about them. |
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| 05:48 | <@ToxicFrog> | So far I've handed out one 10, one 9, and everything else has been <=5. |
| 05:51 | <@ToxicFrog> | Conclusion: almost no-one in this course understands K-maps at all. |
| 05:52 | < Namegduf> | I remember studying those. |
| 05:54 | <@McMartin> | K-maps are pretty awesome |
| 05:54 | <@McMartin> | I've forgotten them, but I remember them being awesome. |
| 05:54 | <@ToxicFrog> | God. Even Alexandra, who kicked the shit out of the previous two assignments, is doing miserably. |
| 05:54 | <@ToxicFrog> | THEY'RE TOROIDALLY CONNECTED, PEOPLE |
| 05:54 | <@ToxicFrog> | AND IT'S OK FOR REGIONS TO OVERLAP |
| 05:55 | <@McMartin> | I blame videogames |
| 05:55 | <@McMartin> | Or, more specifically, the shift to heathenous 2D |
| 05:55 | <@McMartin> | Er |
| 05:55 | <@McMartin> | 3D |
| 05:55 | <@McMartin> | 2D being clasically toroidally connected and all |
| 05:56 | < Vornicus> | A great many 3d games are still toroidal |
| 05:56 | < celticminstrel> | "toroidally connected" didn't exactly pop into my head when he was talking about it. |
| 05:56 | < celticminstrel> | Definitely true though.. |
| 05:56 | < Vornicus> | ff7 etc have toroidal world maps, as does Populous: the Beginning, which was a hell of a mindfuck... |
| 05:58 | <@ToxicFrog> | I'm seeing three distinct failure modes here. |
| 05:58 | <@ToxicFrog> | (1) failure to realize regions can (and often should) overlap |
| 05:58 | <@ToxicFrog> | (2) failure to realize that the k-map is a torus |
| 05:58 | <@ToxicFrog> | (3) stupid mistakes mapping equations in CPOS and CSOP form resulting in transposed rows and columns |
| 06:03 | < Vornicus> | CPOS and CSOP? |
| 06:04 | < celticminstrel> | No idea what the C is, but product-of-sum and sum-of-product. I think. |
| 06:04 | <@ToxicFrog> | Canonical {product,sum} of {sums,products} |
| 06:09 | < Vornicus> | ah |
| 06:11 | <@ToxicFrog> | Specifically, what happens is that the layout of the k-map is 0 1 3 2 \\ 4 5 7 6 \\ 12 13 15 14 \\ 8 9 11 10 |
| 06:11 | <@ToxicFrog> | But people see something like E(0, 2, 4, 6, 7) and fill out the map as though it were 0 1 2 3 \\ 4 5 6 7 \\ 8 9 10 11 \\ 12 13 14 15 |
| 06:12 | < celticminstrel> | I have no idea what the E thing means. |
| 06:13 | <@ToxicFrog> | ? |
| 06:13 | < Vornicus> | hooray grey code |
| 06:13 | < Vornicus> | gray code? |
| 06:13 | | * Vornicus forgets the spelling for that one. |
| 06:16 | < celticminstrel> | Still have no idea what it means though... |
| 06:16 | < celticminstrel> | Oh wait. |
| 06:17 | < celticminstrel> | But not how the following map in any way follows from it. |
| 06:17 | <@ToxicFrog> | Greek capital sigma, otherwise known as the sum-of function. |
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| 06:18 | <@ToxicFrog> | The indexes of the minterms in CSOP notation are the same as the indexes of the cells in the K-map that are 1. |
| 06:18 | <@ToxicFrog> | However, the cells in the K-map are arranged in Gray code order, not numeric order. |
| 06:20 | < Vornicus> | so correctly, that map would be filled out 1 0 0 1 / 1 0 1 1 / 0 0 0 0 / 0 0 0 0 |
| 06:20 | | * jerith <3 K-maps. |
| 06:20 | < Vornicus> | but they're doing 1 0 1 0 / 1 0 1 1 / 0 0 0 0 / 0 0 0 0 |
| 06:20 | < Vornicus> | Speaking of which whatever happened to Karnaugh? |
| 06:21 | <@jerith> | He still hangs out on Shadowfire. |
| 06:22 | < celticminstrel> | Ah, I didn't realize those numbers were indices. <_< |
| 06:24 | < Vornicus> | To be fair that one slips me up too -- for some reason though only in the y direction. |
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| 07:42 | | You're now known as TheWatcher |
| 08:11 | <@TheWatcher> | Ohgods, I should know better than to read the backscroll in here first thing in the morning *shudders at the nightmares that were K-maps at uni* |
| 08:13 | | * Vornicus patpats TW |
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| 13:29 | <@ToxicFrog> | TheWatcher[afk]: hey, k-maps are awesoe |
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| 14:34 | < simon_> | hmm |
| 14:34 | < simon_> | an assignment asks me to implement some malloc/free strategies and benchmark them. |
| 14:34 | < simon_> | I'm a little confused about how my program asks the kernel about more heap memory for the freelist. |
| 14:35 | < simon_> | I suppose there are system calls for this for specific operating systems. |
| 14:35 | < simon_> | but the closest to the kernel I ever came were malloc/free, so I'm sure there must be something more low-level :) |
| 14:43 | < celticminstrel> | Assembly? |
| 14:55 | < simon_> | celticminstrel, how would I refer to the heap in C/inline assembler? |
| 14:56 | < celticminstrel> | By address? I dunno. |
| 14:57 | < celticminstrel> | Just for the record, I have no idea what the answer is to your, uh, dilemma. |
| 14:59 | < simon_> | well |
| 15:00 | < simon_> | if I have a pointer to the start of the heap, and the current size of the heap, my algorithm is good to go. if I can't get that using low-level calls, I could fake it by calling malloc(). but it seems stupid since *I'm* supposed to implement malloc. :P |
| 15:00 | < simon_> | so I suppose what I want is an address to the start of the heap and a system call that asks for more heap space (and assumes that the kernel can do some neat memory mapping, so I don't need to think about much.) |
| 15:01 | < celticminstrel> | Well, that seems good enough then. Maybe. |
| 15:01 | < celticminstrel> | Perhaps the size and location of the heap is supposed to be given? |
| 15:01 | < celticminstrel> | ie write an algorithm assuming you know that. |
| 15:01 | < celticminstrel> | Since it's low-level, it wouldn't surprise me... |
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| 18:20 | <@ToxicFrog> | simon_: sbrk(2)? |
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| 23:00 | <@ToxicFrog> | Someone recommend me a linux email client with threading, group-by-date, and contacts management. |
| 23:02 | <@TheWatcher> | Claws will do 1 and 3, but not 2 AFAIK... |
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| --- Log closed Fri Feb 04 00:00:20 2011 |