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[fmcoder]

I narrowed the problem down to a pretty little program, here's the code:

var
  C: HCHANNEL;
  buf: array of Byte;
  D: String;
begin
  D := ExtractFilePath(ParamStr(0)); //get the executable path
  BASS_Init(0, 44100, 0, Handle, nil);
  BASS_PluginLoad(PChar(D + 'bass_aac.dll'), BASS_UNICODE); //<-- without this line there's no crash...
  C := BASS_StreamCreateFile(False, PChar(D + 'Billy Ocean - Loverboy.m4a'), 0, 0, BASS_STREAM_DECODE or BASS_SAMPLE_FLOAT or BASS_UNICODE);
  SetLength(buf, 10000000);
  BASS_ChannelSetPosition(C, 0, 0); //<-- without this line there's no crash...
  BASS_ChannelGetData(C, @buf[0], 10000000);
end;

The crash doesn't appear if either:

1) BASS_PluginLoad line is commented out and the channel is created without using plugins. This pops up a question: how does BASS opens an m4a file without plugins? (the BASS_ChannelInfo returns "0" in the plugin field to confirm it). When the file is handled by BASS, there's no crash and file plays fine. Probably a good solution will be to give BASS a priority when creating streams, eg. try plugins only if BASS was unable to open the file.

2) BASS_ChannelSetPosition line is commented out. It doesn't crash if position is set to 100000 or more, but crashes for values under 10000 (approx.).

Here's the program and test mp4 file: http://www.djsoft.net/crash.rar

[Ian @ un4seen]

This looks like it may be something that's sorted in the latest stuff...

   www.un4seen.com/stuff/bass_aac.dll

Please give that a try and let me know if the problem still occurs.

Regarding decoder priority, BASS's built-in decoders do have priority over plugins, but BASS doesn't actually include built-in support for MP4 files. It can use Media Foundation codecs to decode MP4 files (on Windows 7 and updated Vista), and they have the lowest priority, ie. the order of priority is: built-in decoders, plugins, Media Foundation codecs. So BASS_AAC will be used if loaded (via BASS_PluginLoad), otherwise the Media Foundation codec will (if available).

[fmcoder]

Yes, it works

Thanks!

[Ian @ un4seen]

Jolly good.

The BASS_AAC update is now up on the BASS webpage. Besides the fix for MP4 files such as the one above, the built-in MP4 tag (BASS_TAG_MP4) support has also been removed from the Windows version, as BASS (since 2.4.8) itself does include built-in MP4 tag support on Windows (it's needed for the Media Foundation codec).