MusicMod: Moved it from Branches to Externals, I guess there usually is no Branches dir in the trunk dir, so this may look a little better

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2174 8ced0084-cf51-0410-be5f-012b33b47a6e

Externals/MusicMod/Player/Src/Winamp/Dsp.h

@@ -0,0 +1,47 @@
+#ifndef WINAMP_DSP_H
+#define WINAMP_DSP_H
+
+
+#include <windows.h>
+
+// DSP plugin interface
+
+// notes:
+// any window that remains in foreground should optimally pass unused
+// keystrokes to the parent (winamp's) window, so that the user
+// can still control it. As for storing configuration,
+// Configuration data should be stored in <dll directory>\plugin.ini
+// (look at the vis plugin for configuration code)
+
+typedef struct winampDSPModule {
+  char *description;		// description
+  HWND hwndParent;			// parent window (filled in by calling app)
+  HINSTANCE hDllInstance;	// instance handle to this DLL (filled in by calling app)
+
+  void (*Config)(struct winampDSPModule *this_mod);  // configuration dialog (if needed)
+  int (*Init)(struct winampDSPModule *this_mod);     // 0 on success, creates window, etc (if needed)
+
+  // modify waveform samples: returns number of samples to actually write
+  // (typically numsamples, but no more than twice numsamples, and no less than half numsamples)
+  // numsamples should always be at least 128. should, but I'm not sure
+  int (*ModifySamples)(struct winampDSPModule *this_mod, short int *samples, int numsamples, int bps, int nch, int srate);
+			
+  void (*Quit)(struct winampDSPModule *this_mod);    // called when unloading
+
+  void *userData; // user data, optional
+} winampDSPModule;
+
+typedef struct {
+  int version;       // DSP_HDRVER
+  char *description; // description of library
+  winampDSPModule* (*getModule)(int);	// module retrieval function
+} winampDSPHeader;
+
+// exported symbols
+typedef winampDSPHeader* (*winampDSPGetHeaderType)();
+
+// header version: 0x20 == 0.20 == winamp 2.0
+#define DSP_HDRVER 0x20
+
+
+#endif // WINAMP_DSP_H