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/* $Id$ */
#include "../stdafx.h"
#ifdef WIN32_ENABLE_DIRECTMUSIC_SUPPORT
extern "C" {
#include "../openttd.h"
#include "../debug.h"
#include "../win32.h"
#include "dmusic.h"
}
#include <windows.h>
#include <dmksctrl.h>
#include <dmusici.h>
#include <dmusicc.h>
#include <dmusicf.h>
// the performance object controls manipulation of the segments
static IDirectMusicPerformance* performance = NULL;
// the loader object can load many types of DMusic related files
static IDirectMusicLoader* loader = NULL;
// the segment object is where the MIDI data is stored for playback
static IDirectMusicSegment* segment = NULL;
static bool seeking = false;
#define M(x) x "\0"
static const char ole_files[] =
M("ole32.dll")
M("CoCreateInstance")
M("CoInitialize")
M("CoUninitialize")
M("")
;
#undef M
struct ProcPtrs {
unsigned long (WINAPI * CoCreateInstance)(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID riid, LPVOID* ppv);
HRESULT (WINAPI * CoInitialize)(LPVOID pvReserved);
void (WINAPI * CoUninitialize)();
};
static ProcPtrs proc;
static const char* DMusicMidiStart(const char* const* parm)
{
if (performance != NULL) return NULL;
if (proc.CoCreateInstance == NULL) {
if (!LoadLibraryList((Function*)&proc, ole_files))
return "ole32.dll load failed";
}
// Initialize COM
if (FAILED(proc.CoInitialize(NULL))) {
return "COM initialization failed";
}
// create the performance object
if (FAILED(proc.CoCreateInstance(
CLSID_DirectMusicPerformance,
NULL,
CLSCTX_INPROC,
IID_IDirectMusicPerformance,
(LPVOID*)&performance
))) {
proc.CoUninitialize();
return "Failed to create the performance object";
}
// initialize it
if (FAILED(performance->Init(NULL, NULL, NULL))) {
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "Failed to initialize performance object";
}
// choose default Windows synth
if (FAILED(performance->AddPort(NULL))) {
performance->CloseDown();
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "AddPort failed";
}
// create the loader object; this will be used to load the MIDI file
if (FAILED(proc.CoCreateInstance(
CLSID_DirectMusicLoader,
NULL,
CLSCTX_INPROC,
IID_IDirectMusicLoader,
(LPVOID*)&loader
))) {
performance->CloseDown();
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "Failed to create loader object";
}
return NULL;
}
static void DMusicMidiStop(void)
{
/* release everything but the segment, which the performance
* will release automatically (and it'll crash if it's been
* released already) */
seeking = false;
loader->Release();
loader = NULL;
performance->CloseDown();
performance->Release();
performance = NULL;
segment = NULL;
proc.CoUninitialize();
}
static void DMusicMidiPlaySong(const char* filename)
{
// set up the loader object info
DMUS_OBJECTDESC obj_desc;
ZeroMemory(&obj_desc, sizeof(obj_desc));
obj_desc.dwSize = sizeof(obj_desc);
obj_desc.guidClass = CLSID_DirectMusicSegment;
obj_desc.dwValidData = DMUS_OBJ_CLASS | DMUS_OBJ_FILENAME | DMUS_OBJ_FULLPATH;
MultiByteToWideChar(
CP_ACP, MB_PRECOMPOSED,
filename, -1,
obj_desc.wszFileName, lengthof(obj_desc.wszFileName)
);
// release the existing segment if we have any
if (segment != NULL) {
segment->Release();
segment = NULL;
}
// make a new segment
if (FAILED(loader->GetObject(
&obj_desc, IID_IDirectMusicSegment, (LPVOID*)&segment
))) {
DEBUG(misc, 0) ("DirectMusic: Get object failed");
return;
}
// tell the segment what kind of data it contains
if (FAILED(segment->SetParam(
GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, performance
))) {
DEBUG(misc, 0) ("DirectMusic: SetParam (MIDI file) failed");
return;
}
// tell the segment to 'download' the instruments
if (FAILED(segment->SetParam(GUID_Download, 0xFFFFFFFF, 0, 0, performance))) {
DEBUG(misc, 0) ("DirectMusic: Failed to download instruments");
return;
}
// start playing the MIDI file
if (FAILED(performance->PlaySegment(segment, 0, 0, NULL))) {
DEBUG(misc, 0) ("DirectMusic: PlaySegment failed");
return;
}
seeking = true;
}
static void DMusicMidiStopSong(void)
{
if (FAILED(performance->Stop(segment, NULL, 0, 0))) {
DEBUG(misc, 0) ("DirecMusic: StopSegment failed");
}
seeking = false;
}
static bool DMusicMidiIsSongPlaying(void)
{
/* Not the nicest code, but there is a short delay before playing actually
* starts. OpenTTD makes no provision for this. */
if (performance->IsPlaying(segment, NULL) == S_OK) {
seeking = false;
return true;
} else {
return seeking;
}
}
static void DMusicMidiSetVolume(byte vol)
{
// 0 - 127 -> -2000 - 0
long db = vol * 2000 / 127 - 2000;
performance->SetGlobalParam(GUID_PerfMasterVolume, &db, sizeof(db));
}
extern "C" const HalMusicDriver _dmusic_midi_driver = {
DMusicMidiStart,
DMusicMidiStop,
DMusicMidiPlaySong,
DMusicMidiStopSong,
DMusicMidiIsSongPlaying,
DMusicMidiSetVolume,
};
#endif
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