qzdoom-gpl/src/sound/music_midistream.cpp

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/*
** music_midistream.cpp
** Implements base class for MIDI and MUS streaming.
**
**---------------------------------------------------------------------------
** Copyright 2008 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
// HEADER FILES ------------------------------------------------------------
#include "i_musicinterns.h"
#include "templates.h"
#include "doomdef.h"
#include "m_swap.h"
// MACROS ------------------------------------------------------------------
#define MAX_TIME (1000000/10) // Send out 1/10 of a sec of events at a time.
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
EXTERN_CVAR(Float, snd_musicvolume)
#ifdef _WIN32
extern UINT mididevice;
#endif
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// PUBLIC DATA DEFINITIONS -------------------------------------------------
// CODE --------------------------------------------------------------------
//==========================================================================
//
// MIDIStreamer Constructor
//
//==========================================================================
MIDIStreamer::MIDIStreamer(EMIDIDevice type)
:
#ifdef _WIN32
PlayerThread(0), ExitEvent(0), BufferDoneEvent(0),
#endif
MIDI(0), Division(0), InitialTempo(500000), DeviceType(type)
{
#ifdef _WIN32
BufferDoneEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (BufferDoneEvent == NULL)
{
Printf(PRINT_BOLD, "Could not create buffer done event for MIDI playback\n");
}
ExitEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (ExitEvent == NULL)
{
Printf(PRINT_BOLD, "Could not create exit event for MIDI playback\n");
return;
}
#endif
}
//==========================================================================
//
// MIDIStreamer OPL Dumping Constructor
//
//==========================================================================
MIDIStreamer::MIDIStreamer(const char *dumpname, EMIDIDevice type)
:
#ifdef _WIN32
PlayerThread(0), ExitEvent(0), BufferDoneEvent(0),
#endif
MIDI(0), Division(0), InitialTempo(500000), DeviceType(type), DumpFilename(dumpname)
{
#ifdef _WIN32
BufferDoneEvent = NULL;
ExitEvent = NULL;
#endif
}
//==========================================================================
//
// MIDIStreamer Destructor
//
//==========================================================================
MIDIStreamer::~MIDIStreamer()
{
Stop();
#ifdef _WIN32
if (ExitEvent != NULL)
{
CloseHandle(ExitEvent);
}
if (BufferDoneEvent != NULL)
{
CloseHandle(BufferDoneEvent);
}
#endif
if (MIDI != NULL)
{
delete MIDI;
}
}
//==========================================================================
//
// MIDIStreamer :: IsMIDI
//
// You bet it is!
//
//==========================================================================
bool MIDIStreamer::IsMIDI() const
{
return true;
}
//==========================================================================
//
// MIDIStreamer :: IsValid
//
//==========================================================================
bool MIDIStreamer::IsValid() const
{
#ifdef _WIN32
return ExitEvent != NULL && Division != 0;
#else
return Division != 0;
#endif
}
//==========================================================================
//
// MIDIStreamer :: CheckCaps
//
// Called immediately after the device is opened in case a subclass should
// want to alter its behavior depending on which device it got.
//
//==========================================================================
void MIDIStreamer::CheckCaps()
{
}
//==========================================================================
//
// MIDIStreamer :: Play
//
//==========================================================================
void MIDIStreamer::Play(bool looping)
{
DWORD tid;
m_Status = STATE_Stopped;
m_Looping = looping;
EndQueued = 0;
VolumeChanged = false;
Restarting = true;
InitialPlayback = true;
assert(MIDI == NULL);
if (DumpFilename.IsNotEmpty())
{
if (DeviceType == MIDI_OPL)
{
MIDI = new OPLDumperMIDIDevice(DumpFilename);
}
else if (DeviceType == MIDI_Timidity)
{
MIDI = new TimidityWaveWriterMIDIDevice(DumpFilename, 0);
}
}
else switch(DeviceType)
{
case MIDI_Win:
#ifdef _WIN32
MIDI = new WinMIDIDevice(mididevice);
break;
#endif
assert(0);
// Intentional fall-through for non-Windows systems.
case MIDI_Timidity:
MIDI = new TimidityMIDIDevice;
break;
case MIDI_OPL:
MIDI = new OPLMIDIDevice;
break;
}
#ifndef _WIN32
assert(MIDI->NeedThreadedCallback() == false);
#endif
if (0 != MIDI->Open(Callback, this))
{
Printf(PRINT_BOLD, "Could not open MIDI out device\n");
return;
}
CheckCaps();
Precache();
// Set time division and tempo.
if (0 != MIDI->SetTimeDiv(Division) ||
0 != MIDI->SetTempo(Tempo = InitialTempo))
{
Printf(PRINT_BOLD, "Setting MIDI stream speed failed\n");
MIDI->Close();
return;
}
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
MusicVolumeChanged(); // set volume to current music's properties
#ifdef _WIN32
ResetEvent(ExitEvent);
ResetEvent(BufferDoneEvent);
#endif
// Fill the initial buffers for the song.
BufferNum = 0;
do
{
int res = FillBuffer(BufferNum, MAX_EVENTS, MAX_TIME);
if (res == SONG_MORE)
{
if (0 != MIDI->StreamOutSync(&Buffer[BufferNum]))
{
Printf ("Initial midiStreamOut failed\n");
Stop();
return;
}
BufferNum ^= 1;
}
else if (res == SONG_DONE)
{
// Do not play super short songs that can't fill the initial two buffers.
Stop();
return;
}
else
{
Stop();
return;
}
}
while (BufferNum != 0);
if (0 != MIDI->Resume())
{
Printf ("Starting MIDI playback failed\n");
Stop();
}
else
{
#ifdef _WIN32
if (MIDI->NeedThreadedCallback())
{
PlayerThread = CreateThread(NULL, 0, PlayerProc, this, 0, &tid);
if (PlayerThread == NULL)
{
Printf ("Creating MIDI thread failed\n");
Stop();
}
else
{
m_Status = STATE_Playing;
}
}
else
#endif
{
m_Status = STATE_Playing;
}
}
}
//==========================================================================
//
// MIDIStreamer :: Pause
//
// "Pauses" the song by setting it to zero volume and filling subsequent
// buffers with NOPs until the song is unpaused. A MIDI device that
// supports real pauses will return true from its Pause() method.
//
//==========================================================================
void MIDIStreamer::Pause()
{
if (m_Status == STATE_Playing)
{
m_Status = STATE_Paused;
if (!MIDI->Pause(true))
{
OutputVolume(0);
}
}
}
//==========================================================================
//
// MIDIStreamer :: Resume
//
// "Unpauses" a song by restoring the volume and letting subsequent
// buffers store real MIDI events again.
//
//==========================================================================
void MIDIStreamer::Resume()
{
if (m_Status == STATE_Paused)
{
if (!MIDI->Pause(false))
{
OutputVolume(Volume);
}
m_Status = STATE_Playing;
}
}
//==========================================================================
//
// MIDIStreamer :: Stop
//
// Stops playback and closes the player thread and MIDI device.
//
//==========================================================================
void MIDIStreamer::Stop()
{
EndQueued = 2;
#ifdef _WIN32
if (PlayerThread != NULL)
{
SetEvent(ExitEvent);
WaitForSingleObject(PlayerThread, INFINITE);
CloseHandle(PlayerThread);
PlayerThread = NULL;
}
#endif
if (MIDI != NULL && MIDI->IsOpen())
{
MIDI->Stop();
MIDI->UnprepareHeader(&Buffer[0]);
MIDI->UnprepareHeader(&Buffer[1]);
MIDI->Close();
}
if (MIDI != NULL)
{
delete MIDI;
MIDI = NULL;
}
m_Status = STATE_Stopped;
}
//==========================================================================
//
// MIDIStreamer :: IsPlaying
//
//==========================================================================
bool MIDIStreamer::IsPlaying()
{
return m_Status != STATE_Stopped;
}
//==========================================================================
//
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
// MIDIStreamer :: MusicVolumeChanged
//
// WinMM MIDI doesn't go through the sound system, so the normal volume
// changing procedure doesn't work for it.
//
//==========================================================================
void MIDIStreamer::MusicVolumeChanged()
{
if (MIDI->FakeVolume())
{
float realvolume = clamp<float>(snd_musicvolume * relative_volume, 0.f, 1.f);
Volume = clamp<DWORD>((DWORD)(realvolume * 65535.f), 0, 65535);
}
else
{
Volume = 0xFFFF;
}
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
if (m_Status == STATE_Playing)
{
OutputVolume(Volume);
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
}
}
void MIDIStreamer::TimidityVolumeChanged()
{
if (MIDI != NULL)
{
MIDI->TimidityVolumeChanged();
}
}
//==========================================================================
//
// MIDIStreamer :: OutputVolume
//
// Signals the buffer filler to send volume change events on all channels.
//
//==========================================================================
void MIDIStreamer::OutputVolume (DWORD volume)
{
if (MIDI->FakeVolume())
{
NewVolume = volume;
VolumeChanged = true;
}
}
//==========================================================================
//
// MIDIStreamer :: VolumeControllerChange
//
// Some devices don't support master volume
// (e.g. the Audigy's software MIDI synth--but not its two hardware ones),
// so assume none of them do and scale channel volumes manually.
//
//==========================================================================
int MIDIStreamer::VolumeControllerChange(int channel, int volume)
{
ChannelVolumes[channel] = volume;
VERY IMPORTANT NOTE FOR ANYBODY BUILDING FROM THE TRUNK: This commit adds support for FMOD Ex while at the same time removing support for FMOD 3. Be sure to update your SDKs. GCC users, be sure to do a "make cleandep && make clean" before building, or you will likely get inexplicable errors. - Fixed: If you wanted to make cleandep with MinGW, you had to specifically specify Makefile.mingw as the makefile to use. - Added a normalizer to the OPL synth. It helped bring up the volume a little, but not nearly as much as I would have liked. - Removed MIDI Mapper references. It doesn't work with the stream API, and it doesn't really exist on NT kernels, either. - Reworked music volume: Except for MIDI, all music volume is controlled through GSnd and not at the individual song level. - Removed the mididevice global variable. - Removed snd_midivolume. Now that all music uses a linear volume scale, there's no need for two separate music volume controls. - Increased snd_samplerate default up to 48000. - Added snd_format, defaulting to "PCM-16". - Added snd_speakermode, defaulting to "Auto". - Replaced snd_fpu with snd_resampler, defaulting to "Linear". - Bumped the snd_channels default up from a pitiful 12 to 32. - Changed snd_3d default to true. The new cvar snd_hw3d determines if hardware 3D support is used and default to false. - Removed the libFLAC source, since FMOD Ex has native FLAC support. - Removed the altsound code, since it was terribly gimped in comparison to the FMOD code. It's original purpose was to have been as a springboard for writing a non-FMOD sound system for Unix-y systems, but that never happened. - Finished preliminary FMOD Ex support. SVN r789 (trunk)
2008-03-09 03:13:49 +00:00
return ((volume + 1) * Volume) >> 16;
}
//==========================================================================
//
// MIDIStreamer :: Callback Static
//
// Signals the BufferDoneEvent to prepare the next buffer. The buffer is not
// prepared in the callback directly, because it's generally still in use by
// the MIDI streamer when this callback is executed.
//
//==========================================================================
void MIDIStreamer::Callback(unsigned int uMsg, void *userdata, DWORD dwParam1, DWORD dwParam2)
{
MIDIStreamer *self = (MIDIStreamer *)userdata;
if (self->EndQueued > 1)
{
return;
}
if (uMsg == MOM_DONE)
{
#ifdef _WIN32
if (self->PlayerThread != NULL)
{
SetEvent(self->BufferDoneEvent);
}
else
#endif
{
self->ServiceEvent();
}
}
}
//==========================================================================
//
// MIDIStreamer :: Update
//
// Called periodically to see if the player thread is still alive. If it
// isn't, stop playback now.
//
//==========================================================================
void MIDIStreamer::Update()
{
#ifdef _WIN32
// If the PlayerThread is signalled, then it's dead.
if (PlayerThread != NULL &&
WaitForSingleObject(PlayerThread, 0) == WAIT_OBJECT_0)
{
CloseHandle(PlayerThread);
PlayerThread = NULL;
Printf ("MIDI playback failure\n");
Stop();
}
#endif
}
//==========================================================================
//
// MIDIStreamer :: PlayerProc Static
//
// Entry point for the player thread.
//
//==========================================================================
#ifdef _WIN32
DWORD WINAPI MIDIStreamer::PlayerProc (LPVOID lpParameter)
{
return ((MIDIStreamer *)lpParameter)->PlayerLoop();
}
#endif
//==========================================================================
//
// MIDIStreamer :: PlayerLoop
//
// Services MIDI playback events.
//
//==========================================================================
#ifdef _WIN32
DWORD MIDIStreamer::PlayerLoop()
{
HANDLE events[2] = { BufferDoneEvent, ExitEvent };
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
for (;;)
{
switch (WaitForMultipleObjects(2, events, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
if (ServiceEvent())
{
return 1;
}
break;
case WAIT_OBJECT_0 + 1:
return 0;
default:
// Should not happen.
return 1;
}
}
}
#endif
//==========================================================================
//
// MIDIStreamer :: ServiceEvent
//
// Fills the buffer that just finished playing with new events and appends
// it to the MIDI stream queue. Stops the song if playback is over. Returns
// true if a problem occured and playback should stop.
//
//==========================================================================
bool MIDIStreamer::ServiceEvent()
{
if (EndQueued == 1)
{
return false;
}
if (0 != MIDI->UnprepareHeader(&Buffer[BufferNum]))
{
return true;
}
fill:
switch (FillBuffer(BufferNum, MAX_EVENTS, MAX_TIME))
{
case SONG_MORE:
if ((MIDI->NeedThreadedCallback() && 0 != MIDI->StreamOutSync(&Buffer[BufferNum])) ||
(!MIDI->NeedThreadedCallback() && 0 != MIDI->StreamOut(&Buffer[BufferNum])))
{
return true;
}
else
{
BufferNum ^= 1;
}
break;
case SONG_DONE:
if (m_Looping)
{
Restarting = true;
goto fill;
}
EndQueued = 1;
break;
default:
return true;
}
return false;
}
//==========================================================================
//
// MIDIStreamer :: FillBuffer
//
// Copies MIDI events from the SMF and puts them into a MIDI stream
// buffer. Filling the buffer stops when the song end is encountered, the
// buffer space is used up, or the maximum time for a buffer is hit.
//
// Can return:
// - SONG_MORE if the buffer was prepared with data.
// - SONG_DONE if the song's end was reached.
// The buffer will never have data in this case.
// - SONG_ERROR if there was a problem preparing the buffer.
//
//==========================================================================
int MIDIStreamer::FillBuffer(int buffer_num, int max_events, DWORD max_time)
{
if (!Restarting && CheckDone())
{
return SONG_DONE;
}
int i;
DWORD *events = Events[buffer_num], *max_event_p;
DWORD tot_time = 0;
DWORD time = 0;
// The final event is for a NOP to hold the delay from the last event.
max_event_p = events + (max_events - 1) * 3;
if (InitialPlayback)
{
InitialPlayback = false;
// Send the full master volume SysEx message.
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = (MEVT_LONGMSG << 24) | 8; // dwEvent
events[3] = MAKE_ID(0xf0,0x7f,0x7f,0x04); // dwParms[0]
events[4] = MAKE_ID(0x01,0x7f,0x7f,0xf7); // dwParms[1]
events += 5;
DoInitialSetup();
}
// If the volume has changed, stick those events at the start of this buffer.
if (VolumeChanged && (m_Status != STATE_Paused || NewVolume == 0))
{
VolumeChanged = false;
for (i = 0; i < 16; ++i)
{
BYTE courseVol = (BYTE)(((ChannelVolumes[i]+1) * NewVolume) >> 16);
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = MIDI_CTRLCHANGE | i | (7<<8) | (courseVol<<16);
events += 3;
}
}
// Play nothing while paused.
if (m_Status == STATE_Paused)
{
// Be more responsive when unpausing by only playing each buffer
// for a third of the maximum time.
events[0] = MAX<DWORD>(1, (max_time / 3) * Division / Tempo);
events[1] = 0;
events[2] = MEVT_NOP << 24;
events += 3;
}
else
{
if (Restarting)
{
Restarting = false;
// Stop all notes in case any were left hanging.
for (i = 0; i < 16; ++i)
{
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = MIDI_CTRLCHANGE | i | (123 << 8); // All notes off
events[3] = 0;
events[4] = 0;
events[5] = MIDI_CTRLCHANGE | i | (121 << 8); // Reset controllers
events += 6;
}
DoRestart();
}
events = MakeEvents(events, max_event_p, max_time);
}
memset(&Buffer[buffer_num], 0, sizeof(MIDIHDR));
Buffer[buffer_num].lpData = (LPSTR)Events[buffer_num];
Buffer[buffer_num].dwBufferLength = DWORD((LPSTR)events - Buffer[buffer_num].lpData);
Buffer[buffer_num].dwBytesRecorded = Buffer[buffer_num].dwBufferLength;
if (0 != MIDI->PrepareHeader(&Buffer[buffer_num]))
{
return SONG_ERROR;
}
return SONG_MORE;
}
//==========================================================================
//
// MIDIStreamer :: GetStats
//
//==========================================================================
FString MIDIStreamer::GetStats()
{
if (MIDI == NULL)
{
return "No MIDI device in use.";
}
return MIDI->GetStats();
}
//==========================================================================
//
// MIDIDevice stubs.
//
//==========================================================================
MIDIDevice::MIDIDevice()
{
}
MIDIDevice::~MIDIDevice()
{
}
//==========================================================================
//
// MIDIDevice :: PrecacheInstruments
//
// The MIDIStreamer calls this method between device open and the first
// buffered stream with a list of instruments known to be used by the song.
// If the device can benefit from preloading the instruments, it can do so
// now.
//
// Each entry is packed as follows:
// Bits 0- 6: Instrument number
// Bits 7-13: Bank number
// Bit 14: Select drum set if 1, tone bank if 0
//
//==========================================================================
void MIDIDevice::PrecacheInstruments(const WORD *instruments, int count)
{
}
//==========================================================================
//
// MIDIDevice :: TimidityVolumeChanged
//
//==========================================================================
void MIDIDevice::TimidityVolumeChanged()
{
}
//==========================================================================
//
// MIDIDevice :: GetStats
//
//==========================================================================
FString MIDIDevice::GetStats()
{
return "This MIDI device does not have any stats.";
}