Short: The Player, a converter/replayer Author: Photon,NoName,Platon42,Tolkien,The Dark Coder Uploader: photon scoopex1988 org Type: mus/misc Architecture: m68k-amigaos P6107, Optimized by 25% more and Bugfixed for "The Player 6.1A" The Player 6.1A 610.8 / 05.04.10 Copyright 1992-95 Jarno Paananen Guru / Sahara Surfers A Sahara Surfers Product 1995 Fixed 1998-04 by NoName, Platon42, Tolkien and The Dark Coder Optimized, bugfixed 2010-04 by Photon/Scoopex Packaged single-include easy-to-use archive with examples and comments. New in 610.8 ------------ This is also not a minor update... but the numbering has been kept for historical reasons. In short, SLen variable in P61_Init always wrote SongLength+1. It was bugfixed, so PosJmp to last track works, for example. If you have any code that subtracts 1 from songlength, you need to unfix it for this version. Also, the playroutine has two "big" optimization options, splitchans and split4. Split4 doesn't work with songs with speed F03 or faster, obviously. To split decrunch over 4 frames requires at least 4 frames per notestep ;) Splitchans works with all speeds and splits decrunch in half, basically. There are no speed restrictions. Both Split4 and Splitchans works with CIA and Vblank. Non lev6 mode added for the first time, as "poke DMAs to a byte address". You can for example set a copper wait 11 scanlines after Vblank and load DMAcon, and give the address in a4 to P61_Init. (If you run the playroutine at Vblank of course.) All measurements done with 68000 running at full speed without interfering bitplane or blitter DMA, when used 'in action' the raster time gained might be greater, but still 25 percent. >> Basically, this means a module that took 8.7 scanlines including interrupts with V6.106 will now take 3.5 scanlines if nonLev6 and split4 is usable - circa 4.5 scanlines if split4 is not usable, and if you don't want to use nonLev6 mode, add the time for the DMAson and maybe the SetRepeat interrupt to that. About 140 cycles for DMAson and circa 0.7 scanlines for the SetRepeat interrupt, for 4-channel modules. Timing measurement and testing done on >12 random modules, with the above results. Optimization has been made only with regards to the maximum raster- time consumed, as it is this which affects a demo's or game's performance. But gain should be near to the above also for average time consumed. (I have no idea what the gain will be if you set use=-1. Set it to the value in the P61.#? file comment! All modules have been tested with use=-1, of course, so laziness is not a problem, just a raster time loss.) It has also been tested in 68040 mode on my accelerated OCS A500, and WinUAE 2.0.2b15. Not that it means anything. I've made no changes that would work differently on any Amiga. GLOBAL CHANGES: - restructuring changes, all based on the used new options. CHANGES IN P61_MUSIC: - removed the usage of A2, so 16 cycles saved if called in an interrupt :) CHANGES IN P61_POSJMP: - none. Everything worked when SLen was corrected :) CHANGES IN P61_SETPOSITION: - none. Everything worked when SLen was corrected :) - actually, I added an improvement for click free soundoff/posjmp and soundon... - split4/splitchans option handling added for correct functioning. Read comments. OTHER CHANGES: - anal optimization on everything that affects maxtime. I dare an alien from an advanced civilization to gain more than 16 cycles on the maxtime. See it as a challenge, not as arrogance. A warning: You will become obsessive compulsive... like me... - oscillo option added. This will give you extremely exact sample windows of the samples played each frame, exact enough to allow you to mix channels while Paula is playing the samples... or you can make the best oscilloscope effect yet... I wrote a separate demopart oscilloscope effect to test it, let me know if you want the example source. ADDED FEATURES: - see options in P6108-MaxTimeOptiOptions.S. Use them wisely. For example by reading their comments! DOCUMENTATION: - See extensive comments in P61-Play.S and P61-Example.S. FEEDBACK: - I am confident every module that works in P6107 works in P6108. I've tested even more modules this time :) - If you find a module that doesn't or want to give feedback, email photon scoopex1988 org. - If you want me to answer questions about P61 playroutines in general, ask me soon, before I forget. Best before date is 1 week from release date. :P WISHLIST/FUTURE: - 2-channel cross-Pan/Echo/Delay. Will be in next version. Or you can make it yourself, see plugin comments in P6108-Play.S - 1-2 Extra synth or sample channels. You can do this with P61_Osc. But buffered is more effective. Framework is there, see plugin comments. An example buffered mixing routine will be in next version. Released during Amiga Demo Compo on BP2010. Haujobb rulez :) Greetings to NoName for finding me at the party :) //Photon