d430c18574
This caused crashes on some files (notably MBELLS from Cosmo and NUBC from Body Count) in my port of this code to SLADE 3.
548 lines
11 KiB
C++
548 lines
11 KiB
C++
#ifdef _WIN32
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#include <io.h>
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#endif
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#include <string.h>
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#include <assert.h>
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#include <math.h>
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#include "opl_mus_player.h"
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#include "doomtype.h"
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#include "opl.h"
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#include "w_wad.h"
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#include "templates.h"
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#include "c_cvars.h"
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#include "i_system.h"
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#include "stats.h"
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#define IMF_RATE 700.0
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EXTERN_CVAR (Int, opl_numchips)
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OPLmusicBlock::OPLmusicBlock()
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{
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scoredata = NULL;
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NextTickIn = 0;
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LastOffset = 0;
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NumChips = MIN(*opl_numchips, 2);
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Looping = false;
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FullPan = false;
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io = NULL;
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io = new OPLio;
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}
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OPLmusicBlock::~OPLmusicBlock()
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{
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delete io;
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}
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void OPLmusicBlock::ResetChips ()
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{
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ChipAccess.Enter();
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io->OPLdeinit ();
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NumChips = io->OPLinit(MIN(*opl_numchips, 2), FullPan);
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ChipAccess.Leave();
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}
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void OPLmusicBlock::Restart()
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{
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OPLstopMusic ();
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OPLplayMusic (127);
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MLtime = 0;
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playingcount = 0;
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LastOffset = 0;
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}
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OPLmusicFile::OPLmusicFile (FILE *file, BYTE *musiccache, int len)
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: ScoreLen (len)
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{
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if (io == NULL)
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{
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return;
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}
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scoredata = new BYTE[len];
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if (file)
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{
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if (fread (scoredata, 1, len, file) != (size_t)len)
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{
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fail: delete[] scoredata;
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scoredata = NULL;
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return;
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}
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}
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else
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{
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memcpy(scoredata, &musiccache[0], len);
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}
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if (0 == (NumChips = io->OPLinit(NumChips)))
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{
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goto fail;
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}
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// Check for RDosPlay raw OPL format
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if (((DWORD *)scoredata)[0] == MAKE_ID('R','A','W','A') &&
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((DWORD *)scoredata)[1] == MAKE_ID('D','A','T','A'))
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{
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RawPlayer = RDosPlay;
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if (*(WORD *)(scoredata + 8) == 0)
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{ // A clock speed of 0 is bad
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*(WORD *)(scoredata + 8) = 0xFFFF;
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}
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SamplesPerTick = LittleShort(*(WORD *)(scoredata + 8)) / ADLIB_CLOCK_MUL;
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}
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// Check for DosBox OPL dump
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else if (((DWORD *)scoredata)[0] == MAKE_ID('D','B','R','A') &&
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((DWORD *)scoredata)[1] == MAKE_ID('W','O','P','L'))
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{
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if (((DWORD *)scoredata)[2] == MAKE_ID(0,0,1,0))
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{
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RawPlayer = DosBox1;
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SamplesPerTick = OPL_SAMPLE_RATE / 1000;
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ScoreLen = MIN<int>(len - 24, LittleLong(((DWORD *)scoredata)[4])) + 24;
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}
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else if (((DWORD *)scoredata)[2] == MAKE_ID(2,0,0,0))
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{
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bool okay = true;
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if (scoredata[21] != 0)
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{
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Printf("Unsupported DOSBox Raw OPL format %d\n", scoredata[20]);
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okay = false;
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}
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if (scoredata[22] != 0)
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{
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Printf("Unsupported DOSBox Raw OPL compression %d\n", scoredata[21]);
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okay = false;
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}
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if (!okay)
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goto fail;
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RawPlayer = DosBox2;
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SamplesPerTick = OPL_SAMPLE_RATE / 1000;
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int headersize = 0x1A + scoredata[0x19];
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ScoreLen = MIN<int>(len - headersize, LittleLong(((DWORD *)scoredata)[3]) * 2) + headersize;
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}
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else
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{
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Printf("Unsupported DOSBox Raw OPL version %d.%d\n", LittleShort(((WORD *)scoredata)[4]), LittleShort(((WORD *)scoredata)[5]));
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goto fail;
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}
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}
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// Check for modified IMF format (includes a header)
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else if (((DWORD *)scoredata)[0] == MAKE_ID('A','D','L','I') &&
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scoredata[4] == 'B' && scoredata[5] == 1)
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{
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int songlen;
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BYTE *max = scoredata + ScoreLen;
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RawPlayer = IMF;
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SamplesPerTick = OPL_SAMPLE_RATE / IMF_RATE;
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score = scoredata + 6;
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// Skip track and game name
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for (int i = 2; i != 0; --i)
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{
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while (score < max && *score++ != '\0') {}
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}
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if (score < max) score++; // Skip unknown byte
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if (score + 8 > max)
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{ // Not enough room left for song data
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delete[] scoredata;
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scoredata = NULL;
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return;
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}
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songlen = LittleLong(*(DWORD *)score);
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if (songlen != 0 && (songlen +=4) < ScoreLen - (score - scoredata))
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{
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ScoreLen = songlen + int(score - scoredata);
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}
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}
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else
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{
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goto fail;
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}
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Restart ();
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}
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OPLmusicFile::~OPLmusicFile ()
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{
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if (scoredata != NULL)
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{
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io->OPLdeinit ();
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delete[] scoredata;
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scoredata = NULL;
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}
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}
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bool OPLmusicFile::IsValid () const
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{
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return scoredata != NULL;
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}
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void OPLmusicFile::SetLooping (bool loop)
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{
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Looping = loop;
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}
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void OPLmusicFile::Restart ()
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{
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OPLmusicBlock::Restart();
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WhichChip = 0;
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switch (RawPlayer)
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{
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case RDosPlay:
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score = scoredata + 10;
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SamplesPerTick = LittleShort(*(WORD *)(scoredata + 8)) / ADLIB_CLOCK_MUL;
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break;
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case DosBox1:
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score = scoredata + 24;
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SamplesPerTick = OPL_SAMPLE_RATE / 1000;
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break;
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case DosBox2:
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score = scoredata + 0x1A + scoredata[0x19];
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SamplesPerTick = OPL_SAMPLE_RATE / 1000;
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break;
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case IMF:
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score = scoredata + 6;
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// Skip track and game name
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for (int i = 2; i != 0; --i)
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{
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while (*score++ != '\0') {}
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}
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score++; // Skip unknown byte
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if (*(DWORD *)score != 0)
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{
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score += 4; // Skip song length
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}
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break;
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}
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io->SetClockRate(SamplesPerTick);
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}
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bool OPLmusicBlock::ServiceStream (void *buff, int numbytes)
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{
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float *samples1 = (float *)buff;
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int stereoshift = (int)(FullPan | io->IsOPL3);
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int numsamples = numbytes / (sizeof(float) << stereoshift);
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bool prevEnded = false;
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bool res = true;
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memset(buff, 0, numbytes);
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ChipAccess.Enter();
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while (numsamples > 0)
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{
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double ticky = NextTickIn;
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int tick_in = int(NextTickIn);
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int samplesleft = MIN(numsamples, tick_in);
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size_t i;
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if (samplesleft > 0)
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{
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for (i = 0; i < io->NumChips; ++i)
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{
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io->chips[i]->Update(samples1, samplesleft);
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}
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OffsetSamples(samples1, samplesleft << stereoshift);
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assert(NextTickIn == ticky);
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NextTickIn -= samplesleft;
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assert (NextTickIn >= 0);
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numsamples -= samplesleft;
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samples1 += samplesleft << stereoshift;
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}
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if (NextTickIn < 1)
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{
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int next = PlayTick();
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assert(next >= 0);
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if (next == 0)
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{ // end of song
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if (!Looping || prevEnded)
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{
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if (numsamples > 0)
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{
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for (i = 0; i < io->NumChips; ++i)
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{
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io->chips[i]->Update(samples1, numsamples);
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}
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OffsetSamples(samples1, numsamples << stereoshift);
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}
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res = false;
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break;
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}
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else
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{
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// Avoid infinite loops from songs that do nothing but end
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prevEnded = true;
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Restart ();
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}
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}
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else
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{
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prevEnded = false;
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io->WriteDelay(next);
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NextTickIn += SamplesPerTick * next;
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assert (NextTickIn >= 0);
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MLtime += next;
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}
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}
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}
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ChipAccess.Leave();
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return res;
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}
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void OPLmusicBlock::OffsetSamples(float *buff, int count)
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{
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// Three out of four of the OPL waveforms are non-negative. Depending on
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// timbre selection, this can cause the output waveform to tend toward
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// very large positive values. Heretic's music is particularly bad for
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// this. This function attempts to compensate by offseting the sample
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// data back to around the [-1.0, 1.0] range.
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double max = -1e10, min = 1e10, offset, step;
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int i, ramp, largest_at = 0;
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// Find max and min values for this segment of the waveform.
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for (i = 0; i < count; ++i)
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{
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if (buff[i] > max)
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{
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max = buff[i];
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largest_at = i;
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}
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if (buff[i] < min)
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{
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min = buff[i];
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largest_at = i;
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}
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}
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// Prefer to keep the offset at 0, even if it means a little clipping.
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if (LastOffset == 0 && min >= -1.1 && max <= 1.1)
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{
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offset = 0;
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}
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else
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{
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offset = (max + min) / 2;
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// If the new offset is close to 0, make it 0 to avoid making another
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// full loop through the sample data.
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if (fabs(offset) < 1/256.0)
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{
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offset = 0;
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}
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}
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// Ramp the offset change so there aren't any abrupt clicks in the output.
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// If the ramp is too short, it can sound scratchy. cblood2.mid is
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// particularly unforgiving of short ramps.
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if (count >= 512)
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{
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ramp = 512;
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step = (offset - LastOffset) / 512;
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}
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else
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{
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ramp = MIN(count, MAX(196, largest_at));
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step = (offset - LastOffset) / ramp;
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}
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offset = LastOffset;
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i = 0;
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if (step != 0)
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{
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for (; i < ramp; ++i)
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{
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buff[i] = float(buff[i] - offset);
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offset += step;
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}
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}
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if (offset != 0)
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{
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for (; i < count; ++i)
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{
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buff[i] = float(buff[i] - offset);
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}
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}
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LastOffset = float(offset);
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}
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int OPLmusicFile::PlayTick ()
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{
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BYTE reg, data;
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WORD delay;
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switch (RawPlayer)
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{
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case RDosPlay:
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while (score < scoredata + ScoreLen)
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{
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data = *score++;
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reg = *score++;
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switch (reg)
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{
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case 0: // Delay
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if (data != 0)
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{
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return data;
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}
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break;
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case 2: // Speed change or OPL3 switch
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if (data == 0)
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{
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SamplesPerTick = LittleShort(*(WORD *)(score)) / ADLIB_CLOCK_MUL;
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io->SetClockRate(SamplesPerTick);
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score += 2;
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}
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else if (data == 1)
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{
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WhichChip = 0;
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}
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else if (data == 2)
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{
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WhichChip = 1;
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}
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break;
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case 0xFF: // End of song
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if (data == 0xFF)
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{
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return 0;
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}
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break;
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default: // It's something to stuff into the OPL chip
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io->OPLwriteReg(WhichChip, reg, data);
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break;
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}
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}
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break;
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case DosBox1:
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while (score < scoredata + ScoreLen)
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{
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reg = *score++;
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if (reg == 4)
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{
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reg = *score++;
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data = *score++;
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}
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else if (reg == 0)
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{ // One-byte delay
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return *score++ + 1;
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}
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else if (reg == 1)
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{ // Two-byte delay
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int delay = score[0] + (score[1] << 8) + 1;
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score += 2;
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return delay;
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}
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else if (reg == 2)
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{ // Select OPL chip 0
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WhichChip = 0;
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continue;
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}
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else if (reg == 3)
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{ // Select OPL chip 1
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WhichChip = 1;
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continue;
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}
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else
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{
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data = *score++;
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}
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io->OPLwriteReg(WhichChip, reg, data);
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}
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break;
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case DosBox2:
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{
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BYTE *to_reg = scoredata + 0x1A;
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BYTE to_reg_size = scoredata[0x19];
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BYTE short_delay_code = scoredata[0x17];
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BYTE long_delay_code = scoredata[0x18];
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while (score < scoredata + ScoreLen)
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{
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BYTE code = *score++;
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data = *score++;
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// Which OPL chip to write to is encoded in the high bit of the code value.
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int which = !!(code & 0x80);
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code &= 0x7F;
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if (code == short_delay_code)
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{
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return data + 1;
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}
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else if (code == long_delay_code)
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{
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return (data + 1) << 8;
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}
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else if (code < to_reg_size)
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{
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io->OPLwriteReg(which, to_reg[code], data);
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}
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}
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}
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break;
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case IMF:
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delay = 0;
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while (delay == 0 && score + 4 - scoredata <= ScoreLen)
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{
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if (*(DWORD *)score == 0xFFFFFFFF)
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{ // This is a special value that means to end the song.
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return 0;
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}
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reg = score[0];
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data = score[1];
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delay = LittleShort(((WORD *)score)[1]);
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score += 4;
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io->OPLwriteReg (0, reg, data);
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}
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return delay;
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}
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return 0;
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}
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/*
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ADD_STAT (opl)
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{
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return YM3812GetVoiceString ();
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}
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*/
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OPLmusicFile::OPLmusicFile(const OPLmusicFile *source, const char *filename)
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{
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ScoreLen = source->ScoreLen;
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scoredata = new BYTE[ScoreLen];
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memcpy(scoredata, source->scoredata, ScoreLen);
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SamplesPerTick = source->SamplesPerTick;
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RawPlayer = source->RawPlayer;
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score = source->score;
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NumChips = source->NumChips;
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WhichChip = 0;
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if (io != NULL)
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{
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delete io;
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}
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io = new DiskWriterIO(filename);
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NumChips = io->OPLinit(NumChips);
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Restart();
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}
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void OPLmusicFile::Dump()
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{
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int time;
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time = PlayTick();
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while (time != 0)
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{
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io->WriteDelay(time);
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time = PlayTick();
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}
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}
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