diff options
Diffstat (limited to 'src/music/dmusic.cpp')
| -rw-r--r-- | src/music/dmusic.cpp | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/src/music/dmusic.cpp b/src/music/dmusic.cpp new file mode 100644 index 000000000..e20842d2e --- /dev/null +++ b/src/music/dmusic.cpp @@ -0,0 +1,232 @@ +/* $Id$ */ + +#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) +{ + seeking = false; + + if (performance != NULL) performance->Stop(NULL, NULL, 0, 0); + + if (segment != NULL) { + segment->SetParam(GUID_Unload, 0xFFFFFFFF, 0, 0, performance); + segment->Release(); + segment = NULL; + } + + if (performance != NULL) { + performance->CloseDown(); + performance->Release(); + performance = NULL; + } + + if (loader != NULL) { + loader->Release(); + loader = 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(driver, 0, "DirectMusic: GetObject failed"); + return; + } + + // tell the segment what kind of data it contains + if (FAILED(segment->SetParam( + GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, performance + ))) { + DEBUG(driver, 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(driver, 0, "DirectMusic: failed to download instruments"); + return; + } + + // start playing the MIDI file + if (FAILED(performance->PlaySegment(segment, 0, 0, NULL))) { + DEBUG(driver, 0, "DirectMusic: PlaySegment failed"); + return; + } + + seeking = true; +} + + +static void DMusicMidiStopSong(void) +{ + if (FAILED(performance->Stop(segment, NULL, 0, 0))) { + DEBUG(driver, 0, "DirectMusic: 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 |