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https://github.com/ZDoom/qzdoom.git
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cfe89ef6e6
Currently all it contains are the MIDI sources and the MIDI devices, the rest needs to be reworked first.
995 lines
25 KiB
C++
995 lines
25 KiB
C++
/*
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** music_hmi_midiout.cpp
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** Code to let ZDoom play HMI MIDI music through the MIDI streaming API.
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**
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**---------------------------------------------------------------------------
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** Copyright 2010 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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// HEADER FILES ------------------------------------------------------------
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#include <algorithm>
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#include <assert.h>
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#include "midisource.h"
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#include "zmusic/m_swap.h"
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// MACROS ------------------------------------------------------------------
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#define HMP_NEW_DATE "013195"
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#define HMI_SONG_MAGIC "HMI-MIDISONG061595"
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#define TRACK_MAGIC "HMI-MIDITRACK"
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// Used by SendCommand to check for unexpected end-of-track conditions.
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#define CHECK_FINISHED \
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if (track->TrackP >= track->MaxTrackP) \
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{ \
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track->Finished = true; \
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return events; \
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}
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// In song header
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#define HMI_DIVISION_OFFSET 0xD4
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#define HMI_TRACK_COUNT_OFFSET 0xE4
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#define HMI_TRACK_DIR_PTR_OFFSET 0xE8
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#define HMP_DIVISION_OFFSET 0x38
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#define HMP_TRACK_COUNT_OFFSET 0x30
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#define HMP_DESIGNATIONS_OFFSET 0x94
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#define HMP_TRACK_OFFSET_0 0x308 // original HMP
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#define HMP_TRACK_OFFSET_1 0x388 // newer HMP
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// In track header
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#define HMITRACK_DATA_PTR_OFFSET 0x57
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#define HMITRACK_DESIGNATION_OFFSET 0x99
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#define HMPTRACK_LEN_OFFSET 4
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#define HMPTRACK_DESIGNATION_OFFSET 8
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#define HMPTRACK_MIDI_DATA_OFFSET 12
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#define NUM_HMP_DESIGNATIONS 5
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#define NUM_HMI_DESIGNATIONS 8
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// MIDI device types for designation
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#define HMI_DEV_GM 0xA000 // Generic General MIDI (not a real device)
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#define HMI_DEV_MPU401 0xA001 // MPU-401, Roland Sound Canvas, Ensoniq SoundScape, Rolad RAP-10
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#define HMI_DEV_OPL2 0xA002 // SoundBlaster (Pro), ESS AudioDrive
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#define HMI_DEV_MT32 0xA004 // MT-32
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#define HMI_DEV_SBAWE32 0xA008 // SoundBlaster AWE32
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#define HMI_DEV_OPL3 0xA009 // SoundBlaster 16, Microsoft Sound System, Pro Audio Spectrum 16
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#define HMI_DEV_GUS 0xA00A // Gravis UltraSound, Gravis UltraSound Max/Ace
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// TYPES -------------------------------------------------------------------
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struct HMISong::TrackInfo
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{
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const uint8_t *TrackBegin;
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size_t TrackP;
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size_t MaxTrackP;
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uint32_t Delay;
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uint32_t PlayedTime;
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uint16_t Designation[NUM_HMI_DESIGNATIONS];
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bool Enabled;
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bool Finished;
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uint8_t RunningStatus;
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uint32_t ReadVarLenHMI();
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uint32_t ReadVarLenHMP();
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};
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// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
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// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
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// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
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// EXTERNAL DATA DECLARATIONS ----------------------------------------------
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// PRIVATE DATA DEFINITIONS ------------------------------------------------
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// PUBLIC DATA DEFINITIONS -------------------------------------------------
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// CODE --------------------------------------------------------------------
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//==========================================================================
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//
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// HMISong Constructor
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//
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// Buffers the file and does some validation of the HMI header.
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//
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//==========================================================================
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HMISong::HMISong (const uint8_t *data, size_t len)
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{
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if (len < 0x100)
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{ // Way too small to be HMI.
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return;
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}
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MusHeader.resize(len);
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memcpy(MusHeader.data(), data, len);
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NumTracks = 0;
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// Do some validation of the MIDI file
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if (memcmp(&MusHeader[0], HMI_SONG_MAGIC, sizeof(HMI_SONG_MAGIC)) == 0)
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{
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SetupForHMI((int)len);
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}
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else if (memcmp(&MusHeader[0], "HMIMIDIP", 8) == 0)
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{
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SetupForHMP((int)len);
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}
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}
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//==========================================================================
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//
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// HMISong :: SetupForHMI
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//
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//==========================================================================
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void HMISong::SetupForHMI(int len)
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{
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int i, p;
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auto MusPtr = &MusHeader[0];
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ReadVarLen = ReadVarLenHMI;
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NumTracks = GetShort(MusPtr + HMI_TRACK_COUNT_OFFSET);
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if (NumTracks <= 0)
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{
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return;
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}
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// The division is the number of pulses per quarter note (PPQN).
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// HMI files have two values here, a full value and a quarter value. Some games,
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// notably Quarantines, have identical values for some reason, so it's safer to
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// use the quarter value and multiply it by four than to trust the full value.
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Division = GetShort(MusPtr + HMI_DIVISION_OFFSET) << 2;
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Tempo = InitialTempo = 4000000;
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Tracks.resize(NumTracks + 1);
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int track_dir = GetInt(MusPtr + HMI_TRACK_DIR_PTR_OFFSET);
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// Gather information about each track
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for (i = 0, p = 0; i < NumTracks; ++i)
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{
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int start = GetInt(MusPtr + track_dir + i*4);
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int tracklen, datastart;
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if (start > len - HMITRACK_DESIGNATION_OFFSET - 4)
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{ // Track is incomplete.
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continue;
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}
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// BTW, HMI does not actually check the track header.
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if (memcmp(MusPtr + start, TRACK_MAGIC, 13) != 0)
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{
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continue;
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}
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// The track ends where the next one begins. If this is the
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// last track, then it ends at the end of the file.
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if (i == NumTracks - 1)
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{
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tracklen = len - start;
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}
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else
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{
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tracklen = GetInt(MusPtr + track_dir + i*4 + 4) - start;
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}
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// Clamp incomplete tracks to the end of the file.
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tracklen = std::min(tracklen, len - start);
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if (tracklen <= 0)
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{
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continue;
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}
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// Offset to actual MIDI events.
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datastart = GetInt(MusPtr + start + HMITRACK_DATA_PTR_OFFSET);
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tracklen -= datastart;
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if (tracklen <= 0)
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{
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continue;
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}
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// Store track information
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Tracks[p].TrackBegin = MusPtr + start + datastart;
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Tracks[p].TrackP = 0;
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Tracks[p].MaxTrackP = tracklen;
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// Retrieve track designations. We can't check them yet, since we have not yet
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// connected to the MIDI device.
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for (int ii = 0; ii < NUM_HMI_DESIGNATIONS; ++ii)
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{
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Tracks[p].Designation[ii] = GetShort(MusPtr + start + HMITRACK_DESIGNATION_OFFSET + ii*2);
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}
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p++;
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}
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// In case there were fewer actual chunks in the file than the
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// header specified, update NumTracks with the current value of p.
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NumTracks = p;
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}
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//==========================================================================
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//
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// HMISong :: SetupForHMP
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//
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//==========================================================================
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void HMISong::SetupForHMP(int len)
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{
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int track_data;
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int i, p;
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auto MusPtr = &MusHeader[0];
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ReadVarLen = ReadVarLenHMP;
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if (MusPtr[8] == 0)
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{
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track_data = HMP_TRACK_OFFSET_0;
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}
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else if (memcmp(MusPtr + 8, HMP_NEW_DATE, sizeof(HMP_NEW_DATE)) == 0)
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{
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track_data = HMP_TRACK_OFFSET_1;
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}
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else
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{ // unknown HMIMIDIP version
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return;
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}
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NumTracks = GetInt(MusPtr + HMP_TRACK_COUNT_OFFSET);
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if (NumTracks <= 0)
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{
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return;
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}
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// The division is the number of pulses per quarter note (PPQN).
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Division = GetInt(MusPtr + HMP_DIVISION_OFFSET);
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Tempo = InitialTempo = 1000000;
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Tracks.resize(NumTracks + 1);
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// Gather information about each track
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for (i = 0, p = 0; i < NumTracks; ++i)
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{
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int start = track_data;
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int tracklen;
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if (start > len - HMPTRACK_MIDI_DATA_OFFSET)
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{ // Track is incomplete.
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break;
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}
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tracklen = GetInt(MusPtr + start + HMPTRACK_LEN_OFFSET);
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track_data += tracklen;
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// Clamp incomplete tracks to the end of the file.
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tracklen = std::min(tracklen, len - start);
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if (tracklen <= 0)
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{
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continue;
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}
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// Subtract track header size.
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tracklen -= HMPTRACK_MIDI_DATA_OFFSET;
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if (tracklen <= 0)
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{
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continue;
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}
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// Store track information
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Tracks[p].TrackBegin = MusPtr + start + HMPTRACK_MIDI_DATA_OFFSET;
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Tracks[p].TrackP = 0;
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Tracks[p].MaxTrackP = tracklen;
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// Retrieve track designations. We can't check them yet, since we have not yet
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// connected to the MIDI device.
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#if 0
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// This is completely a guess based on knowledge of how designations work with
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// HMI files. Some songs contain nothing but zeroes for this data, so I'd rather
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// not go around using it without confirmation.
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Printf("Track %d: %d %08x %d: \034I", i, GetInt(MusPtr + start),
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GetInt(MusPtr + start + 4), GetInt(MusPtr + start + 8));
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int designations = HMP_DESIGNATIONS_OFFSET +
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GetInt(MusPtr + start + HMPTRACK_DESIGNATION_OFFSET) * 4 * NUM_HMP_DESIGNATIONS;
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for (int ii = 0; ii < NUM_HMP_DESIGNATIONS; ++ii)
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{
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Printf(" %04x", GetInt(MusPtr + designations + ii*4));
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}
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Printf("\n");
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#endif
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Tracks[p].Designation[0] = HMI_DEV_GM;
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Tracks[p].Designation[1] = HMI_DEV_GUS;
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Tracks[p].Designation[2] = HMI_DEV_OPL2;
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Tracks[p].Designation[3] = 0;
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p++;
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}
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// In case there were fewer actual chunks in the file than the
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// header specified, update NumTracks with the current value of p.
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NumTracks = p;
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}
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//==========================================================================
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//
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// HMISong :: CheckCaps
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//
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// Check track designations and disable tracks that have not been
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// designated for the device we will be playing on.
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//
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//==========================================================================
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void HMISong::CheckCaps(int tech)
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{
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// What's the equivalent HMI device for our technology?
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if (tech == MIDIDEV_FMSYNTH)
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{
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tech = HMI_DEV_OPL3;
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}
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else if (tech == MIDIDEV_MIDIPORT)
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{
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tech = HMI_DEV_MPU401;
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}
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else
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{ // Good enough? Or should we just say we're GM.
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tech = HMI_DEV_SBAWE32;
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}
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for (int i = 0; i < NumTracks; ++i)
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{
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Tracks[i].Enabled = false;
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// Track designations are stored in a 0-terminated array.
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for (unsigned int j = 0; j < NUM_HMI_DESIGNATIONS && Tracks[i].Designation[j] != 0; ++j)
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{
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if (Tracks[i].Designation[j] == tech)
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{
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Tracks[i].Enabled = true;
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}
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// If a track is designated for device 0xA000, it will be played by a MIDI
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// driver for device types 0xA000, 0xA001, and 0xA008. Why this does not
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// include the GUS, I do not know.
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else if (Tracks[i].Designation[j] == HMI_DEV_GM)
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{
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Tracks[i].Enabled = (tech == HMI_DEV_MPU401 || tech == HMI_DEV_SBAWE32);
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}
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// If a track is designated for device 0xA002, it will be played by a MIDI
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// driver for device types 0xA002 or 0xA009.
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else if (Tracks[i].Designation[j] == HMI_DEV_OPL2)
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{
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Tracks[i].Enabled = (tech == HMI_DEV_OPL3);
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}
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// Any other designation must match the specific MIDI driver device number.
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// (Which we handled first above.)
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if (Tracks[i].Enabled)
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{ // This track's been enabled, so we can stop checking other designations.
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break;
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}
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}
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}
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}
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//==========================================================================
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//
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// HMISong :: DoInitialSetup
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//
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// Sets the starting channel volumes.
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//
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//==========================================================================
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void HMISong :: DoInitialSetup()
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{
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for (int i = 0; i < 16; ++i)
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{
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ChannelVolumes[i] = 100;
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}
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}
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//==========================================================================
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//
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// HMISong :: DoRestart
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//
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// Rewinds every track.
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//
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//==========================================================================
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void HMISong :: DoRestart()
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{
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int i;
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// Set initial state.
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FakeTrack = &Tracks[NumTracks];
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NoteOffs.clear();
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for (i = 0; i <= NumTracks; ++i)
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{
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Tracks[i].TrackP = 0;
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Tracks[i].Finished = false;
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Tracks[i].RunningStatus = 0;
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Tracks[i].PlayedTime = 0;
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}
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ProcessInitialMetaEvents ();
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for (i = 0; i < NumTracks; ++i)
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{
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Tracks[i].Delay = ReadVarLen(&Tracks[i]);
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}
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Tracks[i].Delay = 0; // for the FakeTrack
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Tracks[i].Enabled = true;
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TrackDue = Tracks.data();
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TrackDue = FindNextDue();
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}
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//==========================================================================
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//
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// HMISong :: CheckDone
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//
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//==========================================================================
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bool HMISong::CheckDone()
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{
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return TrackDue == nullptr;
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}
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//==========================================================================
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//
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// HMISong :: MakeEvents
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//
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// Copies MIDI events from the file and puts them into a MIDI stream
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// buffer. Returns the new position in the buffer.
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//
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//==========================================================================
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uint32_t *HMISong::MakeEvents(uint32_t *events, uint32_t *max_event_p, uint32_t max_time)
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{
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uint32_t *start_events;
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uint32_t tot_time = 0;
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uint32_t time = 0;
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uint32_t delay;
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start_events = events;
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while (TrackDue && events < max_event_p && tot_time <= max_time)
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{
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// It's possible that this tick may be nothing but meta-events and
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// not generate any real events. Repeat this until we actually
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// get some output so we don't send an empty buffer to the MIDI
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// device.
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do
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{
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delay = TrackDue->Delay;
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time += delay;
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// Advance time for all tracks by the amount needed for the one up next.
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tot_time += delay * Tempo / Division;
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AdvanceTracks(delay);
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// Play all events for this tick.
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do
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{
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bool sysex_noroom = false;
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uint32_t *new_events = SendCommand(events, TrackDue, time, max_event_p - events, sysex_noroom);
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if (sysex_noroom)
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{
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return events;
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}
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TrackDue = FindNextDue();
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if (new_events != events)
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{
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time = 0;
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}
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events = new_events;
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}
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while (TrackDue && TrackDue->Delay == 0 && events < max_event_p);
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}
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while (start_events == events && TrackDue);
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time = 0;
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}
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return events;
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}
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//==========================================================================
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//
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// HMISong :: AdvanceTracks
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//
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// Advances time for all tracks by the specified amount.
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//
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//==========================================================================
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void HMISong::AdvanceTracks(uint32_t time)
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{
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for (int i = 0; i <= NumTracks; ++i)
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{
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if (Tracks[i].Enabled && !Tracks[i].Finished)
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{
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Tracks[i].Delay -= time;
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Tracks[i].PlayedTime += time;
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}
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}
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NoteOffs.AdvanceTime(time);
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}
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//==========================================================================
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//
|
|
// HMISong :: SendCommand
|
|
//
|
|
// Places a single MIDIEVENT in the event buffer.
|
|
//
|
|
//==========================================================================
|
|
|
|
uint32_t *HMISong::SendCommand (uint32_t *events, TrackInfo *track, uint32_t delay, ptrdiff_t room, bool &sysex_noroom)
|
|
{
|
|
uint32_t len;
|
|
uint8_t event, data1 = 0, data2 = 0;
|
|
|
|
// If the next event comes from the fake track, pop an entry off the note-off queue.
|
|
if (track == FakeTrack)
|
|
{
|
|
AutoNoteOff off;
|
|
NoteOffs.Pop(off);
|
|
events[0] = delay;
|
|
events[1] = 0;
|
|
events[2] = MIDI_NOTEON | off.Channel | (off.Key << 8);
|
|
return events + 3;
|
|
}
|
|
|
|
sysex_noroom = false;
|
|
size_t start_p = track->TrackP;
|
|
|
|
CHECK_FINISHED
|
|
event = track->TrackBegin[track->TrackP++];
|
|
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 && event != 0xFe)
|
|
{
|
|
// Normal short message
|
|
if ((event & 0xF0) == 0xF0)
|
|
{
|
|
if (MIDI_CommonLengths[event & 15] > 0)
|
|
{
|
|
data1 = track->TrackBegin[track->TrackP++];
|
|
if (MIDI_CommonLengths[event & 15] > 1)
|
|
{
|
|
data2 = track->TrackBegin[track->TrackP++];
|
|
}
|
|
}
|
|
}
|
|
else if ((event & 0x80) == 0)
|
|
{
|
|
data1 = event;
|
|
event = track->RunningStatus;
|
|
}
|
|
else
|
|
{
|
|
track->RunningStatus = event;
|
|
data1 = track->TrackBegin[track->TrackP++];
|
|
}
|
|
|
|
CHECK_FINISHED
|
|
|
|
if (MIDI_EventLengths[(event&0x70)>>4] == 2)
|
|
{
|
|
data2 = track->TrackBegin[track->TrackP++];
|
|
}
|
|
|
|
// Monitor channel volume controller changes.
|
|
if ((event & 0x70) == (MIDI_CTRLCHANGE & 0x70) && data1 == 7)
|
|
{
|
|
data2 = VolumeControllerChange(event & 15, data2);
|
|
}
|
|
|
|
if (event != MIDI_META)
|
|
{
|
|
events[2] = event | (data1<<8) | (data2<<16);
|
|
}
|
|
|
|
if (ReadVarLen == ReadVarLenHMI && (event & 0x70) == (MIDI_NOTEON & 0x70))
|
|
{ // HMI note on events include the time until an implied note off event.
|
|
NoteOffs.AddNoteOff(track->ReadVarLenHMI(), event & 0x0F, data1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// SysEx events could potentially not have enough room in the buffer...
|
|
if (event == MIDI_SYSEX || event == MIDI_SYSEXEND)
|
|
{
|
|
len = ReadVarLen(track);
|
|
if (len >= (MAX_MIDI_EVENTS-1)*3*4 || skipSysex)
|
|
{ // This message will never fit. Throw it away.
|
|
track->TrackP += len;
|
|
}
|
|
else if (len + 12 >= (size_t)room * 4)
|
|
{ // Not enough room left in this buffer. Backup and wait for the next one.
|
|
track->TrackP = 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->TrackBegin[track->TrackP], len);
|
|
msg += len;
|
|
// Must pad with 0
|
|
while ((size_t)msg & 3)
|
|
{
|
|
*msg++ = 0;
|
|
}
|
|
track->TrackP += len;
|
|
}
|
|
}
|
|
else if (event == MIDI_META)
|
|
{
|
|
// It's a meta-event
|
|
event = track->TrackBegin[track->TrackP++];
|
|
CHECK_FINISHED
|
|
len = ReadVarLen(track);
|
|
CHECK_FINISHED
|
|
|
|
if (track->TrackP + len <= track->MaxTrackP)
|
|
{
|
|
switch (event)
|
|
{
|
|
case MIDI_META_EOT:
|
|
track->Finished = true;
|
|
break;
|
|
|
|
case MIDI_META_TEMPO:
|
|
Tempo =
|
|
(track->TrackBegin[track->TrackP+0]<<16) |
|
|
(track->TrackBegin[track->TrackP+1]<<8) |
|
|
(track->TrackBegin[track->TrackP+2]);
|
|
events[0] = delay;
|
|
events[1] = 0;
|
|
events[2] = (MEVENT_TEMPO << 24) | Tempo;
|
|
break;
|
|
}
|
|
track->TrackP += len;
|
|
if (track->TrackP == track->MaxTrackP)
|
|
{
|
|
track->Finished = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
track->Finished = true;
|
|
}
|
|
}
|
|
else if (event == 0xFE)
|
|
{ // Skip unknown HMI events.
|
|
event = track->TrackBegin[track->TrackP++];
|
|
CHECK_FINISHED
|
|
if (event == 0x13 || event == 0x15)
|
|
{
|
|
track->TrackP += 6;
|
|
}
|
|
else if (event == 0x12 || event == 0x14)
|
|
{
|
|
track->TrackP += 2;
|
|
}
|
|
else if (event == 0x10)
|
|
{
|
|
track->TrackP += 2;
|
|
CHECK_FINISHED
|
|
track->TrackP += track->TrackBegin[track->TrackP] + 5;
|
|
CHECK_FINISHED
|
|
}
|
|
else
|
|
{ // No idea.
|
|
track->Finished = true;
|
|
}
|
|
}
|
|
}
|
|
if (!track->Finished)
|
|
{
|
|
track->Delay = ReadVarLen(track);
|
|
}
|
|
// 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;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: ProcessInitialMetaEvents
|
|
//
|
|
// Handle all the meta events at the start of each track.
|
|
//
|
|
//==========================================================================
|
|
|
|
void HMISong::ProcessInitialMetaEvents ()
|
|
{
|
|
TrackInfo *track;
|
|
int i;
|
|
uint8_t event;
|
|
uint32_t len;
|
|
|
|
for (i = 0; i < NumTracks; ++i)
|
|
{
|
|
track = &Tracks[i];
|
|
while (!track->Finished &&
|
|
track->TrackP < track->MaxTrackP - 4 &&
|
|
track->TrackBegin[track->TrackP] == 0 &&
|
|
track->TrackBegin[track->TrackP+1] == 0xFF)
|
|
{
|
|
event = track->TrackBegin[track->TrackP+2];
|
|
track->TrackP += 3;
|
|
len = ReadVarLen(track);
|
|
if (track->TrackP + len <= track->MaxTrackP)
|
|
{
|
|
switch (event)
|
|
{
|
|
case MIDI_META_EOT:
|
|
track->Finished = true;
|
|
break;
|
|
|
|
case MIDI_META_TEMPO:
|
|
SetTempo(
|
|
(track->TrackBegin[track->TrackP+0]<<16) |
|
|
(track->TrackBegin[track->TrackP+1]<<8) |
|
|
(track->TrackBegin[track->TrackP+2])
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
track->TrackP += len;
|
|
}
|
|
if (track->TrackP >= track->MaxTrackP - 4)
|
|
{
|
|
track->Finished = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: ReadVarLenHMI static
|
|
//
|
|
//==========================================================================
|
|
|
|
uint32_t HMISong::ReadVarLenHMI(TrackInfo *track)
|
|
{
|
|
return track->ReadVarLenHMI();
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: ReadVarLenHMP static
|
|
//
|
|
//==========================================================================
|
|
|
|
uint32_t HMISong::ReadVarLenHMP(TrackInfo *track)
|
|
{
|
|
return track->ReadVarLenHMP();
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: TrackInfo :: ReadVarLenHMI
|
|
//
|
|
// Reads a variable-length SMF number.
|
|
//
|
|
//==========================================================================
|
|
|
|
uint32_t HMISong::TrackInfo::ReadVarLenHMI()
|
|
{
|
|
uint32_t time = 0, t = 0x80;
|
|
|
|
while ((t & 0x80) && TrackP < MaxTrackP)
|
|
{
|
|
t = TrackBegin[TrackP++];
|
|
time = (time << 7) | (t & 127);
|
|
}
|
|
return time;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: TrackInfo :: ReadVarLenHMP
|
|
//
|
|
// Reads a variable-length HMP number. This is similar to the standard SMF
|
|
// variable length number, except it's stored little-endian, and the high
|
|
// bit set means the number is done.
|
|
//
|
|
//==========================================================================
|
|
|
|
uint32_t HMISong::TrackInfo::ReadVarLenHMP()
|
|
{
|
|
uint32_t time = 0;
|
|
uint8_t t = 0;
|
|
int off = 0;
|
|
|
|
while (!(t & 0x80) && TrackP < MaxTrackP)
|
|
{
|
|
t = TrackBegin[TrackP++];
|
|
time |= (t & 127) << off;
|
|
off += 7;
|
|
}
|
|
return time;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// NoteOffQueue :: AddNoteOff
|
|
//
|
|
//==========================================================================
|
|
|
|
void NoteOffQueue::AddNoteOff(uint32_t delay, uint8_t channel, uint8_t key)
|
|
{
|
|
uint32_t i = (uint32_t)size();
|
|
resize(i + 1);
|
|
while (i > 0 && (*this)[Parent(i)].Delay > delay)
|
|
{
|
|
(*this)[i] = (*this)[Parent(i)];
|
|
i = Parent(i);
|
|
}
|
|
(*this)[i].Delay = delay;
|
|
(*this)[i].Channel = channel;
|
|
(*this)[i].Key = key;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// NoteOffQueue :: Pop
|
|
//
|
|
//==========================================================================
|
|
|
|
bool NoteOffQueue::Pop(AutoNoteOff &item)
|
|
{
|
|
if (size() > 0)
|
|
{
|
|
item = front();
|
|
front() = back();
|
|
pop_back();
|
|
Heapify();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// NoteOffQueue :: AdvanceTime
|
|
//
|
|
//==========================================================================
|
|
|
|
void NoteOffQueue::AdvanceTime(uint32_t time)
|
|
{
|
|
// Because the time is decreasing by the same amount for every entry,
|
|
// the heap property is maintained.
|
|
for (auto &item : *this)
|
|
{
|
|
assert(item.Delay >= time);
|
|
item.Delay -= time;
|
|
}
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// NoteOffQueue :: Heapify
|
|
//
|
|
//==========================================================================
|
|
|
|
void NoteOffQueue::Heapify()
|
|
{
|
|
unsigned int i = 0;
|
|
for (;;)
|
|
{
|
|
unsigned int l = Left(i);
|
|
unsigned int r = Right(i);
|
|
unsigned int smallest = i;
|
|
if (l < (unsigned)size() && (*this)[l].Delay < (*this)[i].Delay)
|
|
{
|
|
smallest = l;
|
|
}
|
|
if (r < (unsigned)size() && (*this)[r].Delay < (*this)[smallest].Delay)
|
|
{
|
|
smallest = r;
|
|
}
|
|
if (smallest == i)
|
|
{
|
|
break;
|
|
}
|
|
std::swap((*this)[i], (*this)[smallest]);
|
|
i = smallest;
|
|
}
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// HMISong :: FindNextDue
|
|
//
|
|
// Scans every track for the next event to play. Returns nullptr if all events
|
|
// have been consumed.
|
|
//
|
|
//==========================================================================
|
|
|
|
HMISong::TrackInfo *HMISong::FindNextDue ()
|
|
{
|
|
TrackInfo *track;
|
|
uint32_t best;
|
|
int i;
|
|
|
|
// Give precedence to whichever track last had events taken from it.
|
|
if (TrackDue != FakeTrack && !TrackDue->Finished && TrackDue->Delay == 0)
|
|
{
|
|
return TrackDue;
|
|
}
|
|
if (TrackDue == FakeTrack && NoteOffs.size() != 0 && NoteOffs[0].Delay == 0)
|
|
{
|
|
FakeTrack->Delay = 0;
|
|
return FakeTrack;
|
|
}
|
|
|
|
// Check regular tracks.
|
|
track = nullptr;
|
|
best = 0xFFFFFFFF;
|
|
for (i = 0; i < NumTracks; ++i)
|
|
{
|
|
if (Tracks[i].Enabled && !Tracks[i].Finished && Tracks[i].Delay < best)
|
|
{
|
|
best = Tracks[i].Delay;
|
|
track = &Tracks[i];
|
|
}
|
|
}
|
|
// Check automatic note-offs.
|
|
if (NoteOffs.size() != 0 && NoteOffs[0].Delay <= best)
|
|
{
|
|
FakeTrack->Delay = NoteOffs[0].Delay;
|
|
return FakeTrack;
|
|
}
|
|
return track;
|
|
}
|
|
|