raze/libraries/zmusic/musicformats/music_midi.cpp

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2019-11-10 22:58:51 +00:00
/*
** 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 <string>
#include <algorithm>
#include <assert.h>
#include "zmusic/musinfo.h"
#include "mididevices/mididevice.h"
#include "midisources/midisource.h"
// MACROS ------------------------------------------------------------------
enum
{
MAX_TIME = (1000000/10) // Send out 1/10 of a sec of events at a time.
};
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// Base class for streaming MUS and MIDI files ------------------------------
class MIDIStreamer : public MusInfo
{
public:
MIDIStreamer(EMidiDevice type, const char* args);
~MIDIStreamer();
void MusicVolumeChanged() override;
void Play(bool looping, int subsong) override;
void Pause() override;
void Resume() override;
void Stop() override;
bool IsPlaying() override;
bool IsMIDI() const override;
bool IsValid() const override;
bool SetSubsong(int subsong) override;
void Update() override;
std::string GetStats() override;
void ChangeSettingInt(const char* setting, int value) override;
void ChangeSettingNum(const char* setting, double value) override;
void ChangeSettingString(const char* setting, const char* value) override;
int ServiceEvent();
void SetMIDISource(MIDISource* _source);
bool ServiceStream(void* buff, int len) override;
SoundStreamInfo GetStreamInfo() const override;
int GetDeviceType() const override;
bool DumpWave(const char* filename, int subsong, int samplerate);
protected:
MIDIStreamer(const char* dumpname, EMidiDevice type);
void OutputVolume(uint32_t volume);
int FillBuffer(int buffer_num, int max_events, uint32_t max_time);
int FillStopBuffer(int buffer_num);
uint32_t* WriteStopNotes(uint32_t* events);
int VolumeControllerChange(int channel, int volume);
void SetTempo(int new_tempo);
void Precache();
void StartPlayback();
bool InitPlayback();
//void SetMidiSynth(MIDIDevice *synth);
static EMidiDevice SelectMIDIDevice(EMidiDevice devtype);
MIDIDevice* CreateMIDIDevice(EMidiDevice devtype, int samplerate);
static void Callback(void* userdata);
enum
{
SONG_MORE,
SONG_DONE,
SONG_ERROR
};
std::unique_ptr<MIDIDevice> MIDI;
uint32_t Events[2][MAX_MIDI_EVENTS * 3];
MidiHeader Buffer[2];
int BufferNum;
int EndQueued;
bool VolumeChanged;
bool Restarting;
bool InitialPlayback;
uint32_t NewVolume;
uint32_t Volume;
EMidiDevice DeviceType;
bool CallbackIsThreaded;
int LoopLimit;
std::string Args;
std::unique_ptr<MIDISource> source;
};
// PUBLIC DATA DEFINITIONS -------------------------------------------------
// CODE --------------------------------------------------------------------
//==========================================================================
//
// MIDIStreamer Constructor
//
//==========================================================================
MIDIStreamer::MIDIStreamer(EMidiDevice type, const char *args)
:
DeviceType(type), Args(args)
{
memset(Buffer, 0, sizeof(Buffer));
}
//==========================================================================
//
// MIDIStreamer Destructor
//
//==========================================================================
MIDIStreamer::~MIDIStreamer()
{
Stop();
}
//==========================================================================
//
// MIDIStreamer :: IsMIDI
//
// You bet it is!
//
//==========================================================================
bool MIDIStreamer::IsMIDI() const
{
return true;
}
//==========================================================================
//
// MIDIStreamer :: IsValid
//
//==========================================================================
bool MIDIStreamer::IsValid() const
{
return source != nullptr && source->isValid();
}
//==========================================================================
//
// MIDIStreamer :: SelectMIDIDevice static
//
// Select the MIDI device to play on
//
//==========================================================================
EMidiDevice MIDIStreamer::SelectMIDIDevice(EMidiDevice device)
{
/* MIDI are played as:
- OPL:
- if explicitly selected by $mididevice
- when snd_mididevice is -3 and no midi device is set for the song
- Timidity:
- if explicitly selected by $mididevice
- when snd_mididevice is -2 and no midi device is set for the song
- MMAPI (Win32 only):
- if explicitly selected by $mididevice (non-Win32 redirects this to Sound System)
- when snd_mididevice is >= 0 and no midi device is set for the song
- as fallback when both OPL and Timidity failed and snd_mididevice is >= 0
*/
// Choose the type of MIDI device we want.
if (device != MDEV_DEFAULT)
{
return device;
}
switch (miscConfig.snd_mididevice)
{
case -1: return MDEV_SNDSYS;
case -4:
case -2: return MDEV_TIMIDITY;
case -3: return MDEV_OPL;
case -5: return MDEV_FLUIDSYNTH;
default:
#ifdef _WIN32
return MDEV_MMAPI;
#else
return MDEV_SNDSYS;
#endif
}
}
//==========================================================================
//
// MIDIStreamer :: CreateMIDIDevice
//
//==========================================================================
static EMidiDevice lastRequestedDevice, lastSelectedDevice;
MIDIDevice *MIDIStreamer::CreateMIDIDevice(EMidiDevice devtype, int samplerate)
{
bool checked[MDEV_COUNT] = { false };
MIDIDevice *dev = nullptr;
if (devtype == MDEV_SNDSYS) devtype = MDEV_FLUIDSYNTH;
EMidiDevice requestedDevice = devtype, selectedDevice;
while (dev == nullptr)
{
selectedDevice = devtype;
try
{
switch (devtype)
{
case MDEV_MMAPI:
#ifdef _WIN32
dev = CreateWinMIDIDevice(std::max(0, miscConfig.snd_mididevice));
break;
#endif
// Intentional fall-through for non-Windows systems.
#ifdef HAVE_FLUIDSYNTH
case MDEV_FLUIDSYNTH:
dev = CreateFluidSynthMIDIDevice(samplerate, Args.c_str());
break;
#endif // HAVE_FLUIDSYNTH
case MDEV_OPL:
dev = CreateOplMIDIDevice(Args.c_str());
break;
case MDEV_TIMIDITY:
dev = CreateTimidityPPMIDIDevice(Args.c_str(), samplerate);
break;
default:
break;
}
}
catch (std::runtime_error &err)
{
//DPrintf(DMSG_WARNING, "%s\n", err.what());
checked[devtype] = true;
devtype = MDEV_DEFAULT;
// Opening the requested device did not work out so choose another one.
if (!checked[MDEV_FLUIDSYNTH]) devtype = MDEV_FLUIDSYNTH;
else if (!checked[MDEV_TIMIDITY]) devtype = MDEV_TIMIDITY;
#ifdef _WIN32
else if (!checked[MDEV_MMAPI]) devtype = MDEV_MMAPI;
#endif
else if (!checked[MDEV_OPL]) devtype = MDEV_OPL;
if (devtype == MDEV_DEFAULT)
{
std::string message = std::string(err.what()) + "\n\nFailed to play music: Unable to open any MIDI Device.";
throw std::runtime_error(message);
}
}
}
if (selectedDevice != requestedDevice && (selectedDevice != lastSelectedDevice || requestedDevice != lastRequestedDevice))
{
static const char *devnames[] = {
"Windows Default",
"OPL",
"",
"Timidity++",
"FluidSynth",
};
lastRequestedDevice = requestedDevice;
lastSelectedDevice = selectedDevice;
if (musicCallbacks.Fluid_MessageFunc)
musicCallbacks.Fluid_MessageFunc("Unable to create %s MIDI device. Falling back to %s\n", devnames[requestedDevice], devnames[selectedDevice]);
}
return dev;
}
//==========================================================================
//
// MIDIStreamer :: Play
//
//==========================================================================
void MIDIStreamer::Play(bool looping, int subsong)
{
EMidiDevice devtype;
if (source == nullptr) return; // We have nothing to play so abort.
assert(MIDI == NULL);
m_Looping = looping;
source->SetMIDISubsong(subsong);
devtype = SelectMIDIDevice(DeviceType);
MIDI.reset(CreateMIDIDevice(devtype, miscConfig.snd_outputrate));
InitPlayback();
}
//==========================================================================
//
// MIDIStreamer :: DumpWave
//
//==========================================================================
bool MIDIStreamer::DumpWave(const char *filename, int subsong, int samplerate)
{
m_Looping = false;
if (source == nullptr) return false; // We have nothing to play so abort.
source->SetMIDISubsong(subsong);
assert(MIDI == NULL);
auto devtype = SelectMIDIDevice(DeviceType);
if (devtype == MDEV_MMAPI)
{
throw std::runtime_error("MMAPI device is not supported");
}
auto iMIDI = CreateMIDIDevice(devtype, samplerate);
auto writer = new MIDIWaveWriter(filename, static_cast<SoftSynthMIDIDevice*>(iMIDI));
MIDI.reset(writer);
bool res = InitPlayback();
if (!writer->CloseFile())
{
char buffer[80];
snprintf(buffer, 80, "Could not finish writing wave file: %s\n", strerror(errno));
throw std::runtime_error(buffer);
}
return res;
}
//==========================================================================
//
// MIDIStreamer :: InitPlayback
//
//==========================================================================
bool MIDIStreamer::InitPlayback()
{
m_Status = STATE_Stopped;
EndQueued = 0;
VolumeChanged = false;
Restarting = true;
InitialPlayback = true;
if (MIDI) MIDI->SetCallback(Callback, this);
if (MIDI == NULL || 0 != MIDI->Open())
{
throw std::runtime_error("Could not open MIDI out device");
}
source->CheckCaps(MIDI->GetTechnology());
if (!MIDI->CanHandleSysex()) source->SkipSysex();
StartPlayback();
if (MIDI == nullptr)
{ // The MIDI file had no content and has been automatically closed.
return false;
}
int res = MIDI->Resume();
if (res)
{
throw std::runtime_error("Starting MIDI playback failed");
}
else
{
m_Status = STATE_Playing;
return true;
}
}
SoundStreamInfo MIDIStreamer::GetStreamInfo() const
{
if (MIDI) return MIDI->GetStreamInfo();
else return { 0, 0, 0 };
}
//==========================================================================
//
// MIDIStreamer :: StartPlayback
//
//==========================================================================
void MIDIStreamer::StartPlayback()
{
auto data = source->PrecacheData();
MIDI->PrecacheInstruments(data.data(), (int)data.size());
source->StartPlayback(m_Looping);
// Set time division and tempo.
if (0 != MIDI->SetTimeDiv(source->getDivision()) ||
0 != MIDI->SetTempo(source->getInitialTempo()))
{
throw std::runtime_error("Setting MIDI stream speed failed");
}
MusicVolumeChanged(); // set volume to current music's properties
OutputVolume(Volume);
MIDI->InitPlayback();
// Fill the initial buffers for the song.
BufferNum = 0;
do
{
int res = FillBuffer(BufferNum, MAX_MIDI_EVENTS, MAX_TIME);
if (res == SONG_MORE)
{
if (0 != MIDI->StreamOutSync(&Buffer[BufferNum]))
{
throw std::runtime_error("Initial midiStreamOut failed");
}
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);
}
//==========================================================================
//
// 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 = 4;
if (MIDI != NULL && MIDI->IsOpen())
{
MIDI->Stop();
MIDI->UnprepareHeader(&Buffer[0]);
MIDI->UnprepareHeader(&Buffer[1]);
MIDI->Close();
}
if (MIDI != nullptr)
{
MIDI.reset();
}
m_Status = STATE_Stopped;
}
//==========================================================================
//
// MIDIStreamer :: IsPlaying
//
//==========================================================================
bool MIDIStreamer::IsPlaying()
{
if (m_Status != STATE_Stopped && (MIDI == NULL || (EndQueued != 0 && EndQueued < 4)))
{
std::lock_guard<std::mutex> lock(CritSec);
Stop();
}
if (m_Status != STATE_Stopped && !MIDI->IsOpen())
{
std::lock_guard<std::mutex> lock(CritSec);
Stop();
}
return m_Status != STATE_Stopped;
}
//==========================================================================
//
// 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 != NULL && MIDI->FakeVolume())
{
float realvolume = miscConfig.snd_musicvolume * miscConfig.relative_volume * miscConfig.snd_mastervolume;
if (realvolume < 0 || realvolume > 1) realvolume = 1;
Volume = (uint32_t)(realvolume * 65535.f);
}
else
{
Volume = 0xFFFF;
}
source->setVolume(Volume);
if (m_Status == STATE_Playing)
{
OutputVolume(Volume);
}
}
//==========================================================================
//
// MIDIStreamer :: ChangeSettingInt
//
//==========================================================================
void MIDIStreamer::ChangeSettingInt(const char *setting, int value)
{
if (MIDI != NULL)
{
MIDI->ChangeSettingInt(setting, value);
}
}
//==========================================================================
//
// MIDIStreamer :: ChangeSettingNum
//
//==========================================================================
void MIDIStreamer::ChangeSettingNum(const char *setting, double value)
{
if (MIDI != NULL)
{
MIDI->ChangeSettingNum(setting, value);
}
}
//==========================================================================
//
// MIDIDeviceStreamer :: ChangeSettingString
//
//==========================================================================
void MIDIStreamer::ChangeSettingString(const char *setting, const char *value)
{
if (MIDI != NULL)
{
MIDI->ChangeSettingString(setting, value);
}
}
//==========================================================================
//
// MIDIStreamer :: OutputVolume
//
// Signals the buffer filler to send volume change events on all channels.
//
//==========================================================================
void MIDIStreamer::OutputVolume (uint32_t volume)
{
if (MIDI != NULL && MIDI->FakeVolume())
{
NewVolume = volume;
VolumeChanged = true;
}
}
//==========================================================================
//
// MIDIStreamer :: Callback Static
//
//==========================================================================
void MIDIStreamer::Callback(void *userdata)
{
MIDIStreamer *self = (MIDIStreamer *)userdata;
if (self->EndQueued >= 4)
{
return;
}
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()
{
if (MIDI != nullptr && !MIDI->Update())
{
std::lock_guard<std::mutex> lock(CritSec);
Stop();
}
}
//==========================================================================
//
// 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
// non-zero if a problem occured and playback should stop.
//
//==========================================================================
int MIDIStreamer::ServiceEvent()
{
int res;
if (EndQueued == 2)
{
return 0;
}
if (0 != (res = MIDI->UnprepareHeader(&Buffer[BufferNum])))
{
return res;
}
fill:
if (EndQueued == 1)
{
res = FillStopBuffer(BufferNum);
if ((res & 3) != SONG_ERROR)
{
EndQueued = 2;
}
}
else
{
res = FillBuffer(BufferNum, MAX_MIDI_EVENTS, MAX_TIME);
}
switch (res & 3)
{
case SONG_MORE:
res = MIDI->StreamOut(&Buffer[BufferNum]);
if (res != 0)
{
return res;
}
else
{
BufferNum ^= 1;
}
break;
case SONG_DONE:
if (m_Looping)
{
Restarting = true;
goto fill;
}
EndQueued = 1;
break;
default:
return res >> 2;
}
return 0;
}
//==========================================================================
//
// MIDIStreamer :: FillBuffer
//
// Copies MIDI events from the MIDI file 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, uint32_t max_time)
{
if (!Restarting && source->CheckDone())
{
return SONG_DONE;
}
int i;
uint32_t *events = Events[buffer_num], *max_event_p;
// 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 GS System Reset SysEx message.
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = (MEVENT_LONGMSG << 24) | 6; // dwEvent
events[3] = MAKE_ID(0xf0, 0x7e, 0x7f, 0x09); // dwParms[0]
events[4] = MAKE_ID(0x01, 0xf7, 0x00, 0x00); // dwParms[1]
events += 5;
// Send the full master volume SysEx message.
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = (MEVENT_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;
source->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)
{
uint8_t courseVol = (uint8_t)(((source->getChannelVolume(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] = std::max<uint32_t>(1, (max_time / 3) * source->getDivision() / source->getTempo());
events[1] = 0;
events[2] = MEVENT_NOP << 24;
events += 3;
}
else
{
if (Restarting)
{
Restarting = false;
// Reset the tempo to the inital value.
events[0] = 0; // dwDeltaTime
events[1] = 0; // dwStreamID
events[2] = (MEVENT_TEMPO << 24) | source->getInitialTempo(); // dwEvent
events += 3;
// Stop all notes in case any were left hanging.
events = WriteStopNotes(events);
source->DoRestart();
}
events = source->MakeEvents(events, max_event_p, max_time);
}
memset(&Buffer[buffer_num], 0, sizeof(MidiHeader));
Buffer[buffer_num].lpData = (uint8_t *)Events[buffer_num];
Buffer[buffer_num].dwBufferLength = uint32_t((uint8_t *)events - Buffer[buffer_num].lpData);
Buffer[buffer_num].dwBytesRecorded = Buffer[buffer_num].dwBufferLength;
if (0 != (i = MIDI->PrepareHeader(&Buffer[buffer_num])))
{
return SONG_ERROR | (i << 2);
}
return SONG_MORE;
}
//==========================================================================
//
// MIDIStreamer :: FillStopBuffer
//
// Fills a MIDI buffer with events to stop all channels.
//
//==========================================================================
int MIDIStreamer::FillStopBuffer(int buffer_num)
{
uint32_t *events = Events[buffer_num];
int i;
events = WriteStopNotes(events);
// wait some tics, just so that this buffer takes some time
events[0] = 500;
events[1] = 0;
events[2] = MEVENT_NOP << 24;
events += 3;
memset(&Buffer[buffer_num], 0, sizeof(MidiHeader));
Buffer[buffer_num].lpData = (uint8_t*)Events[buffer_num];
Buffer[buffer_num].dwBufferLength = uint32_t((uint8_t*)events - Buffer[buffer_num].lpData);
Buffer[buffer_num].dwBytesRecorded = Buffer[buffer_num].dwBufferLength;
if (0 != (i = MIDI->PrepareHeader(&Buffer[buffer_num])))
{
return SONG_ERROR | (i << 2);
}
return SONG_MORE;
}
//==========================================================================
//
// MIDIStreamer :: WriteStopNotes
//
// Generates MIDI events to stop all notes and reset controllers on
// every channel.
//
//==========================================================================
uint32_t *MIDIStreamer::WriteStopNotes(uint32_t *events)
{
for (int 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;
}
return events;
}
//==========================================================================
//
//
//
//==========================================================================
void MIDIStreamer::SetMIDISource(MIDISource *_source)
{
source.reset(_source);
source->setTempoCallback([=](int tempo) { return !!MIDI->SetTempo(tempo); } );
}
int MIDIStreamer::GetDeviceType() const
{
return nullptr == MIDI
? MusInfo::GetDeviceType()
: MIDI->GetDeviceType();
}
//==========================================================================
//
// MIDIStreamer :: GetStats
//
//==========================================================================
std::string MIDIStreamer::GetStats()
{
if (MIDI == NULL)
{
return "No MIDI device in use.";
}
return MIDI->GetStats();
}
//==========================================================================
//
// MIDIStreamer :: SetSubsong
//
// Selects which subsong to play in an already-playing file. This is public.
//
//==========================================================================
bool MIDIStreamer::SetSubsong(int subsong)
{
if (source->SetMIDISubsong(subsong))
{
Stop();
Play(m_Looping, subsong);
return true;
}
return false;
}
//==========================================================================
//
// MIDIStreamer :: FillStream
//
//==========================================================================
bool MIDIStreamer::ServiceStream(void* buff, int len)
{
if (!MIDI) return false;
return static_cast<SoftSynthMIDIDevice*>(MIDI.get())->ServiceStream(buff, len);
}
//==========================================================================
//
// create a streamer
//
//==========================================================================
MusInfo* CreateMIDIStreamer(MIDISource *source, EMidiDevice devtype, const char* args)
{
auto me = new MIDIStreamer(devtype, args);
me->SetMIDISource(source);
return me;
}
void MIDIDumpWave(MIDISource* source, EMidiDevice devtype, const char *devarg, const char *outname, int subsong, int samplerate)
{
MIDIStreamer me(devtype, devarg);
me.SetMIDISource(source);
me.DumpWave(outname, subsong, samplerate);
}