How can I Peek data from MP3 using the LoadSound?
Blitz3D Forums/Blitz3D Programming/How can I Peek data from MP3 using the LoadSound?
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| Hi, I'm trying to use the PEEK Command to get data from a Mp3 file in memory after LoadSound is used. Can I use the LoadSound command returned value as the address to PEEK the data ? |
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| I don't think so, since PEEK / POKE need a dedicated litzBank handle referring to a reserved block of memory. To access the RAM at (ironically) random with Blitz using PEEK , you will need to copy or move the relevant data into a Bank. I believe the Kernel32.dll RtlMoveMemory() or similar method can facilitate this, but you will also need to ascertain the pointer for the stored address. ___ It is all rather complicated, so I would instead either read the file as is, or, load the data of the file into a bank with ReadBytes and then process it from there. If you can wait until toorrow I have some old stuff which I was working on to retriieve the TAG data from mp3 files with the potential then to analyse the actual sound itself. It's late now and I am not sure I know where those old files are but I will try and dig them out for you tomorrow. |
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| yes i would be very appreciated for the files. I was using a DLL file called FastPointers for Blitz3D basic. Heres the web site http://www.fastlibs.com/ Thanks for the response. |
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| This isn't an expected use case for Blitz3D, so you'll be swimming against the stream. You should use BlitzMax for this. You can load a MP3 sound file and do what you want with the decoded data (the raw samples). And it supports pointers natively. I can write you a BMax example if it would help. |
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| YES I appreciate it. Thank You |
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| Okay, with small steps. BlitzMax comes with a WAV (for lossless audio) and OGG (for lossy audio) format support. It supports OGG instead of MP3 because OGG has a permissive license. MP3 has some licensing requirements: http://www.mp3licensing.com/help/index.html#5 (If your program is non-profit or for personal use then you should be fine.) There is a way to read and play MP3 files with BlitzMax, you can use a module (a library) for the BASS framework. There is a BlitzMax example here: https://github.com/maxmods/bah.mod/blob/master/bass.mod/examples/example04.bmx With this module you can use functions TBassSample.GetInfo() and TBassSample.GetData() to access the raw decoded data of an audio file in memory. And with the built-in OGG module in BlitzMax you can do something like this: EDIT: corrected some comments. SuperStrict Import brl.ramstream Import brl.oggloader Local address:Byte Ptr = ... 'Pointer to the OGG data in memory. Local size:Int = ... 'Size of the OGG data in memory. Local readable:Int = True Local writeable:Int = False Local OGGStream:TStream = CreateRamStream( address, size, readable, writeable ) Local audioSample:TAudioSample = LoadAudioSample( OGGStream ) 'Create a TAudioSample object from the ram stream of OGG data. If audioSample <> Null Then 'If everything loaded fine. Print audioSample.format Print BytesPerSample[ audioSample.format ] 'BytesPerSample is a helper array from 'mod\brl.mod\audiosample.mod\sample.bmx'. 'audioSample.samples 'Pointer to the sample data. EndIf End |
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| Thank You Very much for your assistance , I will play with this. I was trying to create a dj music software. but because the MP3 license, I will use the wav and ogg format. I will show you the demo when I create it. |
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| ... Just to let you know, Ive not forgotten this... I am still looking for the old files... |
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| ok thanks I was trying to use the Bass sdk libraries I paid for. |
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| Hey, is there a free sdk I can use to decode MP3 files? |
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| I just remembered, I can use the BlitzMax's dll if it has one. is that possible ? |
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| MP3 support is not BlitzMax's, it's from a third-party module for BlitzMax. BlitzMax's built-in modules support WAV and OGG. That BASS module that adds the MP3 support happens to be made by a user called Brucey, and there's a forum area for discussing modules made by him: http://www.blitzbasic.com/Community/topics.php?forum=124 That BASS module can be found in Brucey's repositories in GitHub, and in the documentation for that module it explains where you can find the runtime library: https://github.com/maxmods/bah.mod/blob/master/bass.mod/doc/intro.bbdoc |
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