raze-gles/libraries/zmusic/midisources/midisource_xmi.cpp

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2019-11-10 22:58:51 +00:00
/*
** music_xmi_midiout.cpp
** Code to let ZDoom play XMIDI music through the MIDI streaming API.
**
**---------------------------------------------------------------------------
** Copyright 2010 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 "midisource.h"
#include "zmusic/mididefs.h"
#include "zmusic/m_swap.h"
// MACROS ------------------------------------------------------------------
#define MAX_FOR_DEPTH 4
#define GET_DELAY (EventDue == EVENT_Real ? CurrSong->Delay : NoteOffs[0].Delay)
// Used by SendCommand to check for unexpected end-of-track conditions.
#define CHECK_FINISHED \
if (track->EventP >= track->EventLen) \
{ \
track->Finished = true; \
return events; \
}
// TYPES -------------------------------------------------------------------
struct LoopInfo
{
size_t LoopBegin;
int LoopCount;
bool LoopFinished;
};
struct XMISong::TrackInfo
{
const uint8_t *EventChunk;
size_t EventLen;
size_t EventP;
const uint8_t *TimbreChunk;
size_t TimbreLen;
uint32_t Delay;
uint32_t PlayedTime;
bool Finished;
LoopInfo ForLoops[MAX_FOR_DEPTH];
int ForDepth;
uint32_t ReadVarLen();
uint32_t ReadDelay();
};
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// PUBLIC DATA DEFINITIONS -------------------------------------------------
// CODE --------------------------------------------------------------------
//==========================================================================
//
// XMISong Constructor
//
// Buffers the file and does some validation of the SMF header.
//
//==========================================================================
XMISong::XMISong (const uint8_t* data, size_t len)
: MusHeader(0), Songs(0)
{
MusHeader.resize(len);
memcpy(MusHeader.data(), data, len);
// Find all the songs in this file.
NumSongs = FindXMIDforms(&MusHeader[0], (int)MusHeader.size(), nullptr);
if (NumSongs == 0)
{
return;
}
// XMIDI files are played with a constant 120 Hz clock rate. While the
// song may contain tempo events, these are vestigial remnants from the
// original MIDI file that were not removed by the converter and should
// be ignored.
//
// We can use any combination of Division and Tempo values that work out
// to be 120 Hz.
Division = 60;
Tempo = InitialTempo = 500000;
Songs.resize(NumSongs);
memset(Songs.data(), 0, sizeof(Songs[0]) * NumSongs);
FindXMIDforms(&MusHeader[0], (int)MusHeader.size(), Songs.data());
CurrSong = Songs.data();
//DPrintf(DMSG_SPAMMY, "XMI song count: %d\n", NumSongs);
}
//==========================================================================
//
// XMISong :: FindXMIDforms
//
// Find all FORM XMID chunks in this chunk.
//
//==========================================================================
int XMISong::FindXMIDforms(const uint8_t *chunk, int len, TrackInfo *songs) const
{
int count = 0;
for (int p = 0; p <= len - 12; )
{
int chunktype = GetNativeInt(chunk + p);
int chunklen = GetBigInt(chunk + p + 4);
if (chunktype == MAKE_ID('F','O','R','M'))
{
if (GetNativeInt(chunk + p + 8) == MAKE_ID('X','M','I','D'))
{
if (songs != nullptr)
{
FoundXMID(chunk + p + 12, chunklen - 4, songs + count);
}
count++;
}
}
else if (chunktype == MAKE_ID('C','A','T',' '))
{
// Recurse to handle CAT chunks.
count += FindXMIDforms(chunk + p + 12, chunklen - 4, songs + count);
}
// IFF chunks are padded to even byte boundaries to avoid
// unaligned reads on 68k processors.
p += 8 + chunklen + (chunklen & 1);
// Avoid crashes from corrupt chunks which indicate a negative size.
if (chunklen < 0) p = len;
}
return count;
}
//==========================================================================
//
// XMISong :: FoundXMID
//
// Records information about this XMID song.
//
//==========================================================================
void XMISong::FoundXMID(const uint8_t *chunk, int len, TrackInfo *song) const
{
for (int p = 0; p <= len - 8; )
{
int chunktype = GetNativeInt(chunk + p);
int chunklen = GetBigInt(chunk + p + 4);
if (chunktype == MAKE_ID('T','I','M','B'))
{
song->TimbreChunk = chunk + p + 8;
song->TimbreLen = chunklen;
}
else if (chunktype == MAKE_ID('E','V','N','T'))
{
song->EventChunk = chunk + p + 8;
song->EventLen = chunklen;
// EVNT must be the final chunk in the FORM.
break;
}
p += 8 + chunklen + (chunklen & 1);
}
}
//==========================================================================
//
// XMISong :: SetMIDISubsong
//
// Selects which song in this file to play.
//
//==========================================================================
bool XMISong::SetMIDISubsong(int subsong)
{
if ((unsigned)subsong >= (unsigned)NumSongs)
{
return false;
}
CurrSong = &Songs[subsong];
return true;
}
//==========================================================================
//
// XMISong :: DoInitialSetup
//
// Sets the starting channel volumes.
//
//==========================================================================
void XMISong::DoInitialSetup()
{
for (int i = 0; i < 16; ++i)
{
ChannelVolumes[i] = 100;
}
}
//==========================================================================
//
// XMISong :: DoRestart
//
// Rewinds the current song.
//
//==========================================================================
void XMISong::DoRestart()
{
CurrSong->EventP = 0;
CurrSong->Finished = false;
CurrSong->PlayedTime = 0;
CurrSong->ForDepth = 0;
NoteOffs.clear();
ProcessInitialMetaEvents ();
CurrSong->Delay = CurrSong->ReadDelay();
EventDue = FindNextDue();
}
//==========================================================================
//
// XMISong :: CheckDone
//
//==========================================================================
bool XMISong::CheckDone()
{
return EventDue == EVENT_None;
}
//==========================================================================
//
// XMISong :: MakeEvents
//
// Copies MIDI events from the XMI and puts them into a MIDI stream
// buffer. Returns the new position in the buffer.
//
//==========================================================================
uint32_t *XMISong::MakeEvents(uint32_t *events, uint32_t *max_event_p, uint32_t max_time)
{
uint32_t *start_events;
uint32_t tot_time = 0;
uint32_t time = 0;
uint32_t delay;
start_events = events;
while (EventDue != EVENT_None && events < max_event_p && tot_time <= max_time)
{
// It's possible that this tick may be nothing but meta-events and
// not generate any real events. Repeat this until we actually
// get some output so we don't send an empty buffer to the MIDI
// device.
do
{
delay = GET_DELAY;
time += delay;
// Advance time for all tracks by the amount needed for the one up next.
tot_time += delay * Tempo / Division;
AdvanceSong(delay);
// Play all events for this tick.
do
{
bool sysex_noroom = false;
uint32_t *new_events = SendCommand(events, EventDue, time, max_event_p - events, sysex_noroom);
if (sysex_noroom)
{
return events;
}
EventDue = FindNextDue();
if (new_events != events)
{
time = 0;
}
events = new_events;
}
while (EventDue != EVENT_None && GET_DELAY == 0 && events < max_event_p);
}
while (start_events == events && EventDue != EVENT_None);
time = 0;
}
return events;
}
//==========================================================================
//
// XMISong :: AdvanceSong
//
// Advances time for the current song by the specified amount.
//
//==========================================================================
void XMISong::AdvanceSong(uint32_t time)
{
if (time != 0)
{
if (!CurrSong->Finished)
{
CurrSong->Delay -= time;
CurrSong->PlayedTime += time;
}
NoteOffs.AdvanceTime(time);
}
}
//==========================================================================
//
// XMISong :: SendCommand
//
// Places a single MIDIEVENT in the event buffer.
//
//==========================================================================
uint32_t *XMISong::SendCommand (uint32_t *events, EventSource due, uint32_t delay, ptrdiff_t room, bool &sysex_noroom)
{
uint32_t len;
uint8_t event, data1 = 0, data2 = 0;
if (due == EVENT_Fake)
{
AutoNoteOff off;
NoteOffs.Pop(off);
events[0] = delay;
events[1] = 0;
events[2] = MIDI_NOTEON | off.Channel | (off.Key << 8);
return events + 3;
}
TrackInfo *track = CurrSong;
sysex_noroom = false;
size_t start_p = track->EventP;
CHECK_FINISHED
event = track->EventChunk[track->EventP++];
CHECK_FINISHED
// The actual event type will be filled in below. If it's not a NOP,
// the events pointer will be advanced once the actual event is written.
// Otherwise, we do it at the end of the function.
events[0] = delay;
events[1] = 0;
events[2] = MEVENT_NOP << 24;
if (event != MIDI_SYSEX && event != MIDI_META && event != MIDI_SYSEXEND)
{
// Normal short message
if ((event & 0xF0) == 0xF0)
{
if (MIDI_CommonLengths[event & 15] > 0)
{
data1 = track->EventChunk[track->EventP++];
if (MIDI_CommonLengths[event & 15] > 1)
{
data2 = track->EventChunk[track->EventP++];
}
}
}
else
{
data1 = track->EventChunk[track->EventP++];
}
CHECK_FINISHED
if (MIDI_EventLengths[(event&0x70)>>4] == 2)
{
data2 = track->EventChunk[track->EventP++];
}
if ((event & 0x70) == (MIDI_CTRLCHANGE & 0x70))
{
switch (data1)
{
case 7: // Channel volume
data2 = VolumeControllerChange(event & 15, data2);
break;
case 110: // XMI channel lock
case 111: // XMI channel lock protect
case 112: // XMI voice protect
case 113: // XMI timbre protect
case 115: // XMI indirect controller prefix
case 118: // XMI clear beat/bar count
case 119: // XMI callback trigger
case 120:
event = MIDI_META; // none of these are relevant to us.
break;
case 114: // XMI patch bank select
data1 = 0; // Turn this into a standard MIDI bank select controller.
break;
case 116: // XMI for loop controller
if (track->ForDepth < MAX_FOR_DEPTH)
{
track->ForLoops[track->ForDepth].LoopBegin = track->EventP;
track->ForLoops[track->ForDepth].LoopCount = ClampLoopCount(data2);
track->ForLoops[track->ForDepth].LoopFinished = track->Finished;
}
track->ForDepth++;
event = MIDI_META;
break;
case 117: // XMI next loop controller
if (track->ForDepth > 0)
{
int depth = track->ForDepth - 1;
if (depth < MAX_FOR_DEPTH)
{
if (data2 < 64 || (track->ForLoops[depth].LoopCount == 0 && !isLooping))
{ // throw away this loop.
track->ForLoops[depth].LoopCount = 1;
}
// A loop count of 0 loops forever.
if (track->ForLoops[depth].LoopCount == 0 || --track->ForLoops[depth].LoopCount > 0)
{
track->EventP = track->ForLoops[depth].LoopBegin;
track->Finished = track->ForLoops[depth].LoopFinished;
}
else
{ // done with this loop
track->ForDepth = depth;
}
}
else
{ // ignore any loops deeper than the max depth
track->ForDepth = depth;
}
}
event = MIDI_META;
break;
}
}
events[0] = delay;
events[1] = 0;
if (event != MIDI_META)
{
events[2] = event | (data1<<8) | (data2<<16);
}
events += 3;
if ((event & 0x70) == (MIDI_NOTEON & 0x70))
{ // XMI note on events include the time until an implied note off event.
NoteOffs.AddNoteOff(track->ReadVarLen(), event & 0x0F, data1);
}
}
else
{
// SysEx events could potentially not have enough room in the buffer...
if (event == MIDI_SYSEX || event == MIDI_SYSEXEND)
{
len = track->ReadVarLen();
if (len >= (MAX_MIDI_EVENTS-1)*3*4 || skipSysex)
{ // This message will never fit. Throw it away.
track->EventP += len;
}
else if (len + 12 >= (size_t)room * 4)
{ // Not enough room left in this buffer. Backup and wait for the next one.
track->EventP = start_p;
sysex_noroom = true;
return events;
}
else
{
uint8_t *msg = (uint8_t *)&events[3];
if (event == MIDI_SYSEX)
{ // Need to add the SysEx marker to the message.
events[2] = (MEVENT_LONGMSG << 24) | (len + 1);
*msg++ = MIDI_SYSEX;
}
else
{
events[2] = (MEVENT_LONGMSG << 24) | len;
}
memcpy(msg, &track->EventChunk[track->EventP++], len);
msg += len;
// Must pad with 0
while ((size_t)msg & 3)
{
*msg++ = 0;
}
track->EventP += len;
}
}
else if (event == MIDI_META)
{
// It's a meta-event
event = track->EventChunk[track->EventP++];
CHECK_FINISHED
len = track->ReadVarLen ();
CHECK_FINISHED
if (track->EventP + len <= track->EventLen)
{
if (event == MIDI_META_EOT)
{
track->Finished = true;
}
track->EventP += len;
if (track->EventP == track->EventLen)
{
track->Finished = true;
}
}
else
{
track->Finished = true;
}
}
}
if (!track->Finished)
{
track->Delay = track->ReadDelay();
}
// Advance events pointer unless this is a non-delaying NOP.
if (events[0] != 0 || MEVENT_EVENTTYPE(events[2]) != MEVENT_NOP)
{
if (MEVENT_EVENTTYPE(events[2]) == MEVENT_LONGMSG)
{
events += 3 + ((MEVENT_EVENTPARM(events[2]) + 3) >> 2);
}
else
{
events += 3;
}
}
return events;
}
//==========================================================================
//
// XMISong :: ProcessInitialMetaEvents
//
// Handle all the meta events at the start of the current song.
//
//==========================================================================
void XMISong::ProcessInitialMetaEvents ()
{
TrackInfo *track = CurrSong;
uint8_t event;
uint32_t len;
while (!track->Finished &&
track->EventP < track->EventLen - 3 &&
track->EventChunk[track->EventP] == MIDI_META)
{
event = track->EventChunk[track->EventP+1];
track->EventP += 2;
len = track->ReadVarLen();
if (track->EventP + len <= track->EventLen && event == MIDI_META_EOT)
{
track->Finished = true;
}
track->EventP += len;
}
if (track->EventP >= track->EventLen - 1)
{
track->Finished = true;
}
}
//==========================================================================
//
// XMISong :: TrackInfo :: ReadVarLen
//
// Reads a variable length SMF number.
//
//==========================================================================
uint32_t XMISong::TrackInfo::ReadVarLen()
{
uint32_t time = 0, t = 0x80;
while ((t & 0x80) && EventP < EventLen)
{
t = EventChunk[EventP++];
time = (time << 7) | (t & 127);
}
return time;
}
//==========================================================================
//
// XMISong :: TrackInfo :: ReadDelay
//
// XMI does not use variable length numbers for delays. Instead, it uses
// runs of bytes with the high bit clear.
//
//==========================================================================
uint32_t XMISong::TrackInfo::ReadDelay()
{
uint32_t time = 0, t;
while (EventP < EventLen && !((t = EventChunk[EventP]) & 0x80))
{
time += t;
EventP++;
}
return time;
}
//==========================================================================
//
// XMISong :: FindNextDue
//
// Decides whether the next event should come from the actual stong or
// from the auto note offs.
//
//==========================================================================
XMISong::EventSource XMISong::FindNextDue()
{
// Are there still events available?
if (CurrSong->Finished && NoteOffs.size() == 0)
{
return EVENT_None;
}
// Which is due sooner? The current song or the note-offs?
uint32_t real_delay = CurrSong->Finished ? 0xFFFFFFFF : CurrSong->Delay;
uint32_t fake_delay = NoteOffs.size() == 0 ? 0xFFFFFFFF : NoteOffs[0].Delay;
return (fake_delay <= real_delay) ? EVENT_Fake : EVENT_Real;
}