ref: 18efe412b69bf733c2a9cd544212e4fd3a3c636a
dir: /src/i_oplmusic.c/
// Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA // 02111-1307, USA. // // DESCRIPTION: // System interface for music. // //----------------------------------------------------------------------------- #include <stdio.h> #include <stdlib.h> #include <string.h> #include "memio.h" #include "mus2mid.h" #include "deh_main.h" #include "i_sound.h" #include "i_swap.h" #include "m_misc.h" #include "w_wad.h" #include "z_zone.h" #include "opl.h" #include "midifile.h" // #define OPL_MIDI_DEBUG #define MAXMIDLENGTH (96 * 1024) #define GENMIDI_NUM_INSTRS 128 #define GENMIDI_NUM_PERCUSSION 47 #define GENMIDI_HEADER "#OPL_II#" #define GENMIDI_FLAG_FIXED 0x0001 /* fixed pitch */ #define GENMIDI_FLAG_2VOICE 0x0004 /* double voice (OPL3) */ #define PERCUSSION_LOG_LEN 16 typedef struct { byte tremolo; byte attack; byte sustain; byte waveform; byte scale; byte level; } PACKEDATTR genmidi_op_t; typedef struct { genmidi_op_t modulator; byte feedback; genmidi_op_t carrier; byte unused; short base_note_offset; } PACKEDATTR genmidi_voice_t; typedef struct { unsigned short flags; byte fine_tuning; byte fixed_note; genmidi_voice_t voices[2]; } PACKEDATTR genmidi_instr_t; // Data associated with a channel of a track that is currently playing. typedef struct { // The instrument currently used for this track. genmidi_instr_t *instrument; // Volume level int volume; // Pitch bend value: int bend; } opl_channel_data_t; // Data associated with a track that is currently playing. typedef struct { // Data for each channel. opl_channel_data_t channels[MIDI_CHANNELS_PER_TRACK]; // Track iterator used to read new events. midi_track_iter_t *iter; // Tempo control variables unsigned int ticks_per_beat; unsigned int ms_per_beat; } opl_track_data_t; typedef struct opl_voice_s opl_voice_t; struct opl_voice_s { // Index of this voice: int index; // The operators used by this voice: int op1, op2; // Currently-loaded instrument data genmidi_instr_t *current_instr; // The voice number in the instrument to use. // This is normally set to zero; if this is a double voice // instrument, it may be one. unsigned int current_instr_voice; // The channel currently using this voice. opl_channel_data_t *channel; // The midi key that this voice is playing. unsigned int key; // The note being played. This is normally the same as // the key, but if the instrument is a fixed pitch // instrument, it is different. unsigned int note; // The frequency value being used. unsigned int freq; // The volume of the note being played on this channel. unsigned int note_volume; // The current volume (register value) that has been set for this channel. unsigned int reg_volume; // Next in linked list; a voice is always either in the // free list or the allocated list. opl_voice_t *next; }; // Operators used by the different voices. static const int voice_operators[2][OPL_NUM_VOICES] = { { 0x00, 0x01, 0x02, 0x08, 0x09, 0x0a, 0x10, 0x11, 0x12 }, { 0x03, 0x04, 0x05, 0x0b, 0x0c, 0x0d, 0x13, 0x14, 0x15 } }; // Frequency values to use for each note. static const unsigned short frequency_curve[] = { 0x133, 0x133, 0x134, 0x134, 0x135, 0x136, 0x136, 0x137, // -1 0x137, 0x138, 0x138, 0x139, 0x139, 0x13a, 0x13b, 0x13b, 0x13c, 0x13c, 0x13d, 0x13d, 0x13e, 0x13f, 0x13f, 0x140, 0x140, 0x141, 0x142, 0x142, 0x143, 0x143, 0x144, 0x144, 0x145, 0x146, 0x146, 0x147, 0x147, 0x148, 0x149, 0x149, // -2 0x14a, 0x14a, 0x14b, 0x14c, 0x14c, 0x14d, 0x14d, 0x14e, 0x14f, 0x14f, 0x150, 0x150, 0x151, 0x152, 0x152, 0x153, 0x153, 0x154, 0x155, 0x155, 0x156, 0x157, 0x157, 0x158, // These are used for the first seven MIDI note values: 0x158, 0x159, 0x15a, 0x15a, 0x15b, 0x15b, 0x15c, 0x15d, // 0 0x15d, 0x15e, 0x15f, 0x15f, 0x160, 0x161, 0x161, 0x162, 0x162, 0x163, 0x164, 0x164, 0x165, 0x166, 0x166, 0x167, 0x168, 0x168, 0x169, 0x16a, 0x16a, 0x16b, 0x16c, 0x16c, 0x16d, 0x16e, 0x16e, 0x16f, 0x170, 0x170, 0x171, 0x172, // 1 0x172, 0x173, 0x174, 0x174, 0x175, 0x176, 0x176, 0x177, 0x178, 0x178, 0x179, 0x17a, 0x17a, 0x17b, 0x17c, 0x17c, 0x17d, 0x17e, 0x17e, 0x17f, 0x180, 0x181, 0x181, 0x182, 0x183, 0x183, 0x184, 0x185, 0x185, 0x186, 0x187, 0x188, // 2 0x188, 0x189, 0x18a, 0x18a, 0x18b, 0x18c, 0x18d, 0x18d, 0x18e, 0x18f, 0x18f, 0x190, 0x191, 0x192, 0x192, 0x193, 0x194, 0x194, 0x195, 0x196, 0x197, 0x197, 0x198, 0x199, 0x19a, 0x19a, 0x19b, 0x19c, 0x19d, 0x19d, 0x19e, 0x19f, // 3 0x1a0, 0x1a0, 0x1a1, 0x1a2, 0x1a3, 0x1a3, 0x1a4, 0x1a5, 0x1a6, 0x1a6, 0x1a7, 0x1a8, 0x1a9, 0x1a9, 0x1aa, 0x1ab, 0x1ac, 0x1ad, 0x1ad, 0x1ae, 0x1af, 0x1b0, 0x1b0, 0x1b1, 0x1b2, 0x1b3, 0x1b4, 0x1b4, 0x1b5, 0x1b6, 0x1b7, 0x1b8, // 4 0x1b8, 0x1b9, 0x1ba, 0x1bb, 0x1bc, 0x1bc, 0x1bd, 0x1be, 0x1bf, 0x1c0, 0x1c0, 0x1c1, 0x1c2, 0x1c3, 0x1c4, 0x1c4, 0x1c5, 0x1c6, 0x1c7, 0x1c8, 0x1c9, 0x1c9, 0x1ca, 0x1cb, 0x1cc, 0x1cd, 0x1ce, 0x1ce, 0x1cf, 0x1d0, 0x1d1, 0x1d2, // 5 0x1d3, 0x1d3, 0x1d4, 0x1d5, 0x1d6, 0x1d7, 0x1d8, 0x1d8, 0x1d9, 0x1da, 0x1db, 0x1dc, 0x1dd, 0x1de, 0x1de, 0x1df, 0x1e0, 0x1e1, 0x1e2, 0x1e3, 0x1e4, 0x1e5, 0x1e5, 0x1e6, 0x1e7, 0x1e8, 0x1e9, 0x1ea, 0x1eb, 0x1ec, 0x1ed, 0x1ed, // 6 0x1ee, 0x1ef, 0x1f0, 0x1f1, 0x1f2, 0x1f3, 0x1f4, 0x1f5, 0x1f6, 0x1f6, 0x1f7, 0x1f8, 0x1f9, 0x1fa, 0x1fb, 0x1fc, 0x1fd, 0x1fe, 0x1ff, 0x200, 0x201, 0x201, 0x202, 0x203, // First note of looped range used for all octaves: 0x204, 0x205, 0x206, 0x207, 0x208, 0x209, 0x20a, 0x20b, // 7 0x20c, 0x20d, 0x20e, 0x20f, 0x210, 0x210, 0x211, 0x212, 0x213, 0x214, 0x215, 0x216, 0x217, 0x218, 0x219, 0x21a, 0x21b, 0x21c, 0x21d, 0x21e, 0x21f, 0x220, 0x221, 0x222, 0x223, 0x224, 0x225, 0x226, 0x227, 0x228, 0x229, 0x22a, // 8 0x22b, 0x22c, 0x22d, 0x22e, 0x22f, 0x230, 0x231, 0x232, 0x233, 0x234, 0x235, 0x236, 0x237, 0x238, 0x239, 0x23a, 0x23b, 0x23c, 0x23d, 0x23e, 0x23f, 0x240, 0x241, 0x242, 0x244, 0x245, 0x246, 0x247, 0x248, 0x249, 0x24a, 0x24b, // 9 0x24c, 0x24d, 0x24e, 0x24f, 0x250, 0x251, 0x252, 0x253, 0x254, 0x256, 0x257, 0x258, 0x259, 0x25a, 0x25b, 0x25c, 0x25d, 0x25e, 0x25f, 0x260, 0x262, 0x263, 0x264, 0x265, 0x266, 0x267, 0x268, 0x269, 0x26a, 0x26c, 0x26d, 0x26e, // 10 0x26f, 0x270, 0x271, 0x272, 0x273, 0x275, 0x276, 0x277, 0x278, 0x279, 0x27a, 0x27b, 0x27d, 0x27e, 0x27f, 0x280, 0x281, 0x282, 0x284, 0x285, 0x286, 0x287, 0x288, 0x289, 0x28b, 0x28c, 0x28d, 0x28e, 0x28f, 0x290, 0x292, 0x293, // 11 0x294, 0x295, 0x296, 0x298, 0x299, 0x29a, 0x29b, 0x29c, 0x29e, 0x29f, 0x2a0, 0x2a1, 0x2a2, 0x2a4, 0x2a5, 0x2a6, 0x2a7, 0x2a9, 0x2aa, 0x2ab, 0x2ac, 0x2ae, 0x2af, 0x2b0, 0x2b1, 0x2b2, 0x2b4, 0x2b5, 0x2b6, 0x2b7, 0x2b9, 0x2ba, // 12 0x2bb, 0x2bd, 0x2be, 0x2bf, 0x2c0, 0x2c2, 0x2c3, 0x2c4, 0x2c5, 0x2c7, 0x2c8, 0x2c9, 0x2cb, 0x2cc, 0x2cd, 0x2ce, 0x2d0, 0x2d1, 0x2d2, 0x2d4, 0x2d5, 0x2d6, 0x2d8, 0x2d9, 0x2da, 0x2dc, 0x2dd, 0x2de, 0x2e0, 0x2e1, 0x2e2, 0x2e4, // 13 0x2e5, 0x2e6, 0x2e8, 0x2e9, 0x2ea, 0x2ec, 0x2ed, 0x2ee, 0x2f0, 0x2f1, 0x2f2, 0x2f4, 0x2f5, 0x2f6, 0x2f8, 0x2f9, 0x2fb, 0x2fc, 0x2fd, 0x2ff, 0x300, 0x302, 0x303, 0x304, 0x306, 0x307, 0x309, 0x30a, 0x30b, 0x30d, 0x30e, 0x310, // 14 0x311, 0x312, 0x314, 0x315, 0x317, 0x318, 0x31a, 0x31b, 0x31c, 0x31e, 0x31f, 0x321, 0x322, 0x324, 0x325, 0x327, 0x328, 0x329, 0x32b, 0x32c, 0x32e, 0x32f, 0x331, 0x332, 0x334, 0x335, 0x337, 0x338, 0x33a, 0x33b, 0x33d, 0x33e, // 15 0x340, 0x341, 0x343, 0x344, 0x346, 0x347, 0x349, 0x34a, 0x34c, 0x34d, 0x34f, 0x350, 0x352, 0x353, 0x355, 0x357, 0x358, 0x35a, 0x35b, 0x35d, 0x35e, 0x360, 0x361, 0x363, 0x365, 0x366, 0x368, 0x369, 0x36b, 0x36c, 0x36e, 0x370, // 16 0x371, 0x373, 0x374, 0x376, 0x378, 0x379, 0x37b, 0x37c, 0x37e, 0x380, 0x381, 0x383, 0x384, 0x386, 0x388, 0x389, 0x38b, 0x38d, 0x38e, 0x390, 0x392, 0x393, 0x395, 0x397, 0x398, 0x39a, 0x39c, 0x39d, 0x39f, 0x3a1, 0x3a2, 0x3a4, // 17 0x3a6, 0x3a7, 0x3a9, 0x3ab, 0x3ac, 0x3ae, 0x3b0, 0x3b1, 0x3b3, 0x3b5, 0x3b7, 0x3b8, 0x3ba, 0x3bc, 0x3bd, 0x3bf, 0x3c1, 0x3c3, 0x3c4, 0x3c6, 0x3c8, 0x3ca, 0x3cb, 0x3cd, // The last note has an incomplete range, and loops round back to // the start. Note that the last value is actually a buffer overrun // and does not fit with the other values. 0x3cf, 0x3d1, 0x3d2, 0x3d4, 0x3d6, 0x3d8, 0x3da, 0x3db, // 18 0x3dd, 0x3df, 0x3e1, 0x3e3, 0x3e4, 0x3e6, 0x3e8, 0x3ea, 0x3ec, 0x3ed, 0x3ef, 0x3f1, 0x3f3, 0x3f5, 0x3f6, 0x3f8, 0x3fa, 0x3fc, 0x3fe, 0x36c, }; // Mapping from MIDI volume level to OPL level value. static const unsigned int volume_mapping_table[] = { 0, 1, 3, 5, 6, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 27, 29, 30, 32, 33, 34, 36, 37, 39, 41, 43, 45, 47, 49, 50, 52, 54, 55, 57, 59, 60, 61, 63, 64, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 84, 84, 85, 86, 87, 88, 89, 90, 91, 92, 92, 93, 94, 95, 96, 96, 97, 98, 99, 99, 100, 101, 101, 102, 103, 103, 104, 105, 105, 106, 107, 107, 108, 109, 109, 110, 110, 111, 112, 112, 113, 113, 114, 114, 115, 115, 116, 117, 117, 118, 118, 119, 119, 120, 120, 121, 121, 122, 122, 123, 123, 123, 124, 124, 125, 125, 126, 126, 127, 127 }; static boolean music_initialized = false; //static boolean musicpaused = false; static int current_music_volume; // GENMIDI lump instrument data: static genmidi_instr_t *main_instrs; static genmidi_instr_t *percussion_instrs; static char (*main_instr_names)[32]; static char (*percussion_names)[32]; // Voices: static opl_voice_t voices[OPL_NUM_VOICES]; static opl_voice_t *voice_free_list; static opl_voice_t *voice_alloced_list; // Track data for playing tracks: static opl_track_data_t *tracks; static unsigned int num_tracks = 0; static unsigned int running_tracks = 0; static boolean song_looping; // Mini-log of recently played percussion instruments: static uint8_t last_perc[PERCUSSION_LOG_LEN]; static unsigned int last_perc_count; // Configuration file variable, containing the port number for the // adlib chip. int opl_io_port = 0x388; // Load instrument table from GENMIDI lump: static boolean LoadInstrumentTable(void) { byte *lump; lump = W_CacheLumpName("GENMIDI", PU_STATIC); // Check header if (strncmp((char *) lump, GENMIDI_HEADER, strlen(GENMIDI_HEADER)) != 0) { W_ReleaseLumpName("GENMIDI"); return false; } main_instrs = (genmidi_instr_t *) (lump + strlen(GENMIDI_HEADER)); percussion_instrs = main_instrs + GENMIDI_NUM_INSTRS; main_instr_names = (char (*)[32]) (percussion_instrs + GENMIDI_NUM_PERCUSSION); percussion_names = main_instr_names + GENMIDI_NUM_INSTRS; return true; } // Get the next available voice from the freelist. static opl_voice_t *GetFreeVoice(void) { opl_voice_t *result; // None available? if (voice_free_list == NULL) { return NULL; } // Remove from free list result = voice_free_list; voice_free_list = voice_free_list->next; // Add to allocated list result->next = voice_alloced_list; voice_alloced_list = result; return result; } // Remove a voice from the allocated voices list. static void RemoveVoiceFromAllocedList(opl_voice_t *voice) { opl_voice_t **rover; rover = &voice_alloced_list; // Search the list until we find the voice, then remove it. while (*rover != NULL) { if (*rover == voice) { *rover = voice->next; voice->next = NULL; break; } rover = &(*rover)->next; } } // Release a voice back to the freelist. static void ReleaseVoice(opl_voice_t *voice) { opl_voice_t **rover; voice->channel = NULL; voice->note = 0; // Remove from alloced list. RemoveVoiceFromAllocedList(voice); // Search to the end of the freelist (This is how Doom behaves!) rover = &voice_free_list; while (*rover != NULL) { rover = &(*rover)->next; } *rover = voice; voice->next = NULL; } // Load data to the specified operator static void LoadOperatorData(int operator, genmidi_op_t *data, boolean max_level) { int level; // The scale and level fields must be combined for the level register. // For the carrier wave we always set the maximum level. level = (data->scale & 0xc0) | (data->level & 0x3f); if (max_level) { level |= 0x3f; } OPL_WriteRegister(OPL_REGS_LEVEL + operator, level); OPL_WriteRegister(OPL_REGS_TREMOLO + operator, data->tremolo); OPL_WriteRegister(OPL_REGS_ATTACK + operator, data->attack); OPL_WriteRegister(OPL_REGS_SUSTAIN + operator, data->sustain); OPL_WriteRegister(OPL_REGS_WAVEFORM + operator, data->waveform); } // Set the instrument for a particular voice. static void SetVoiceInstrument(opl_voice_t *voice, genmidi_instr_t *instr, unsigned int instr_voice) { genmidi_voice_t *data; unsigned int modulating; // Instrument already set for this channel? if (voice->current_instr == instr && voice->current_instr_voice == instr_voice) { return; } voice->current_instr = instr; voice->current_instr_voice = instr_voice; data = &instr->voices[instr_voice]; // Are we usind modulated feedback mode? modulating = (data->feedback & 0x01) == 0; // Doom loads the second operator first, then the first. // The carrier is set to minimum volume until the voice volume // is set in SetVoiceVolume (below). If we are not using // modulating mode, we must set both to minimum volume. LoadOperatorData(voice->op2, &data->carrier, true); LoadOperatorData(voice->op1, &data->modulator, !modulating); // Set feedback register that control the connection between the // two operators. Turn on bits in the upper nybble; I think this // is for OPL3, where it turns on channel A/B. OPL_WriteRegister(OPL_REGS_FEEDBACK + voice->index, data->feedback | 0x30); // Hack to force a volume update. voice->reg_volume = 999; } static void SetVoiceVolume(opl_voice_t *voice, unsigned int volume) { genmidi_voice_t *opl_voice; unsigned int full_volume; unsigned int op_volume; unsigned int reg_volume; voice->note_volume = volume; opl_voice = &voice->current_instr->voices[voice->current_instr_voice]; // Multiply note volume and channel volume to get the actual volume. full_volume = (volume_mapping_table[voice->note_volume] * volume_mapping_table[voice->channel->volume] * volume_mapping_table[current_music_volume]) / (127 * 127); // The volume of each instrument can be controlled via GENMIDI: op_volume = 0x3f - opl_voice->carrier.level; // The volume value to use in the register: reg_volume = (op_volume * full_volume) / 128; reg_volume = (0x3f - reg_volume) | opl_voice->carrier.scale; // Update the volume register(s) if necessary. if (reg_volume != voice->reg_volume) { voice->reg_volume = reg_volume; OPL_WriteRegister(OPL_REGS_LEVEL + voice->op2, reg_volume); // If we are using non-modulated feedback mode, we must set the // volume for both voices. // Note that the same register volume value is written for // both voices, always calculated from the carrier's level // value. if ((opl_voice->feedback & 0x01) != 0) { OPL_WriteRegister(OPL_REGS_LEVEL + voice->op1, reg_volume); } } } // Initialize the voice table and freelist static void InitVoices(void) { int i; // Start with an empty free list. voice_free_list = NULL; // Initialize each voice. for (i=0; i<OPL_NUM_VOICES; ++i) { voices[i].index = i; voices[i].op1 = voice_operators[0][i]; voices[i].op2 = voice_operators[1][i]; voices[i].current_instr = NULL; // Add this voice to the freelist. ReleaseVoice(&voices[i]); } } // Set music volume (0 - 127) static void I_OPL_SetMusicVolume(int volume) { unsigned int i; // Internal state variable. current_music_volume = volume; // Update the volume of all voices. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel != NULL) { SetVoiceVolume(&voices[i], voices[i].note_volume); } } } static void VoiceKeyOff(opl_voice_t *voice) { OPL_WriteRegister(OPL_REGS_FREQ_2 + voice->index, voice->freq >> 8); } // Get the frequency that we should be using for a voice. static void KeyOffEvent(opl_track_data_t *track, midi_event_t *event) { opl_channel_data_t *channel; unsigned int key; unsigned int i; /* printf("note off: channel %i, %i, %i\n", event->data.channel.channel, event->data.channel.param1, event->data.channel.param2); */ channel = &track->channels[event->data.channel.channel]; key = event->data.channel.param1; // Turn off voices being used to play this key. // If it is a double voice instrument there will be two. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel == channel && voices[i].key == key) { VoiceKeyOff(&voices[i]); // Finished with this voice now. ReleaseVoice(&voices[i]); } } } // Compare the priorities of channels, returning either -1, 0 or 1. static int CompareChannelPriorities(opl_channel_data_t *chan1, opl_channel_data_t *chan2) { // TODO ... return 1; } // When all voices are in use, we must discard an existing voice to // play a new note. Find and free an existing voice. The channel // passed to the function is the channel for the new note to be // played. static opl_voice_t *ReplaceExistingVoice(opl_channel_data_t *channel) { opl_voice_t *rover; opl_voice_t *result; // Check the allocated voices, if we find an instrument that is // of a lower priority to the new instrument, discard it. // If a voice is being used to play the second voice of an instrument, // use that, as second voices are non-essential. // Lower numbered MIDI channels implicitly have a higher priority // than higher-numbered channels, eg. MIDI channel 1 is never // discarded for MIDI channel 2. result = NULL; for (rover = voice_alloced_list; rover != NULL; rover = rover->next) { if (rover->current_instr_voice != 0 || (rover->channel > channel && CompareChannelPriorities(channel, rover->channel) > 0)) { result = rover; break; } } // If we didn't find a voice, find an existing voice being used to // play a note on the same channel, and use that. if (result == NULL) { for (rover = voice_alloced_list; rover != NULL; rover = rover->next) { if (rover->channel == channel) { result = rover; break; } } } // Still nothing found? Give up and just use the first voice in // the list. if (result == NULL) { result = voice_alloced_list; } // Stop playing this voice playing and release it back to the free // list. VoiceKeyOff(result); ReleaseVoice(result); // Re-allocate the voice again and return it. return GetFreeVoice(); } static unsigned int FrequencyForVoice(opl_voice_t *voice) { genmidi_voice_t *gm_voice; unsigned int freq_index; unsigned int octave; unsigned int sub_index; unsigned int note; note = voice->note; // Apply note offset. // Don't apply offset if the instrument is a fixed note instrument. gm_voice = &voice->current_instr->voices[voice->current_instr_voice]; if ((SHORT(voice->current_instr->flags) & GENMIDI_FLAG_FIXED) == 0) { note += (signed short) SHORT(gm_voice->base_note_offset); } // Avoid possible overflow due to base note offset: if (note > 0x7f) { note = voice->note; } freq_index = 64 + 32 * note + voice->channel->bend; // If this is the second voice of a double voice instrument, the // frequency index can be adjusted by the fine tuning field. if (voice->current_instr_voice != 0) { freq_index += (voice->current_instr->fine_tuning / 2) - 64; } // The first 7 notes use the start of the table, while // consecutive notes loop around the latter part. if (freq_index < 284) { return frequency_curve[freq_index]; } sub_index = (freq_index - 284) % (12 * 32); octave = (freq_index - 284) / (12 * 32); // Once the seventh octave is reached, things break down. // We can only go up to octave 7 as a maximum anyway (the OPL // register only has three bits for octave number), but for the // notes in octave 7, the first five bits have octave=7, the // following notes have octave=6. This 7/6 pattern repeats in // following octaves (which are technically impossible to // represent anyway). if (octave >= 7) { if (sub_index < 5) { octave = 7; } else { octave = 6; } } // Calculate the resulting register value to use for the frequency. return frequency_curve[sub_index + 284] | (octave << 10); } // Update the frequency that a voice is programmed to use. static void UpdateVoiceFrequency(opl_voice_t *voice) { unsigned int freq; // Calculate the frequency to use for this voice and update it // if neccessary. freq = FrequencyForVoice(voice); if (voice->freq != freq) { OPL_WriteRegister(OPL_REGS_FREQ_1 + voice->index, freq & 0xff); OPL_WriteRegister(OPL_REGS_FREQ_2 + voice->index, (freq >> 8) | 0x20); voice->freq = freq; } } // Program a single voice for an instrument. For a double voice // instrument (GENMIDI_FLAG_2VOICE), this is called twice for each // key on event. static void VoiceKeyOn(opl_channel_data_t *channel, genmidi_instr_t *instrument, unsigned int instrument_voice, unsigned int key, unsigned int volume) { opl_voice_t *voice; // Find a voice to use for this new note. voice = GetFreeVoice(); // If there are no more voices left, we must decide what to do. // If this is the first voice of the instrument, free an existing // voice and use that. Otherwise, if this is the second voice, // it isn't as important; just discard it. if (voice == NULL) { if (instrument_voice == 0) { voice = ReplaceExistingVoice(channel); } else { return; } } voice->channel = channel; voice->key = key; // Work out the note to use. This is normally the same as // the key, unless it is a fixed pitch instrument. if ((SHORT(instrument->flags) & GENMIDI_FLAG_FIXED) != 0) { voice->note = instrument->fixed_note; } else { voice->note = key; } // Program the voice with the instrument data: SetVoiceInstrument(voice, instrument, instrument_voice); // Set the volume level. SetVoiceVolume(voice, volume); // Write the frequency value to turn the note on. voice->freq = 0; UpdateVoiceFrequency(voice); } static void KeyOnEvent(opl_track_data_t *track, midi_event_t *event) { genmidi_instr_t *instrument; opl_channel_data_t *channel; unsigned int key; unsigned int volume; /* printf("note on: channel %i, %i, %i\n", event->data.channel.channel, event->data.channel.param1, event->data.channel.param2); */ // The channel. channel = &track->channels[event->data.channel.channel]; key = event->data.channel.param1; volume = event->data.channel.param2; // Percussion channel (10) is treated differently. if (event->data.channel.channel == 9) { if (key < 35 || key > 81) { return; } instrument = &percussion_instrs[key - 35]; last_perc[last_perc_count] = key; last_perc_count = (last_perc_count + 1) % PERCUSSION_LOG_LEN; } else { instrument = channel->instrument; } // Find and program a voice for this instrument. If this // is a double voice instrument, we must do this twice. VoiceKeyOn(channel, instrument, 0, key, volume); if ((SHORT(instrument->flags) & GENMIDI_FLAG_2VOICE) != 0) { VoiceKeyOn(channel, instrument, 1, key, volume); } } static void ProgramChangeEvent(opl_track_data_t *track, midi_event_t *event) { int channel; int instrument; // Set the instrument used on this channel. channel = event->data.channel.channel; instrument = event->data.channel.param1; track->channels[channel].instrument = &main_instrs[instrument]; // TODO: Look through existing voices that are turned on on this // channel, and change the instrument. } static void SetChannelVolume(opl_channel_data_t *channel, unsigned int volume) { unsigned int i; channel->volume = volume; // Update all voices that this channel is using. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel == channel) { SetVoiceVolume(&voices[i], voices[i].note_volume); } } } static void ControllerEvent(opl_track_data_t *track, midi_event_t *event) { unsigned int controller; unsigned int param; opl_channel_data_t *channel; /* printf("change controller: channel %i, %i, %i\n", event->data.channel.channel, event->data.channel.param1, event->data.channel.param2); */ channel = &track->channels[event->data.channel.channel]; controller = event->data.channel.param1; param = event->data.channel.param2; switch (controller) { case MIDI_CONTROLLER_MAIN_VOLUME: SetChannelVolume(channel, param); break; default: #ifdef OPL_MIDI_DEBUG fprintf(stderr, "Unknown MIDI controller type: %i\n", controller); #endif break; } } // Process a pitch bend event. static void PitchBendEvent(opl_track_data_t *track, midi_event_t *event) { opl_channel_data_t *channel; unsigned int i; // Update the channel bend value. Only the MSB of the pitch bend // value is considered: this is what Doom does. channel = &track->channels[event->data.channel.channel]; channel->bend = event->data.channel.param2 - 64; // Update all voices for this channel. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel == channel) { UpdateVoiceFrequency(&voices[i]); } } } // Process a meta event. static void MetaEvent(opl_track_data_t *track, midi_event_t *event) { switch (event->data.meta.type) { // Things we can just ignore. case MIDI_META_SEQUENCE_NUMBER: case MIDI_META_TEXT: case MIDI_META_COPYRIGHT: case MIDI_META_TRACK_NAME: case MIDI_META_INSTR_NAME: case MIDI_META_LYRICS: case MIDI_META_MARKER: case MIDI_META_CUE_POINT: case MIDI_META_SEQUENCER_SPECIFIC: break; // End of track - actually handled when we run out of events // in the track, see below. case MIDI_META_END_OF_TRACK: break; default: #ifdef OPL_MIDI_DEBUG fprintf(stderr, "Unknown MIDI meta event type: %i\n", event->data.meta.type); #endif break; } } // Process a MIDI event from a track. static void ProcessEvent(opl_track_data_t *track, midi_event_t *event) { switch (event->event_type) { case MIDI_EVENT_NOTE_OFF: KeyOffEvent(track, event); break; case MIDI_EVENT_NOTE_ON: KeyOnEvent(track, event); break; case MIDI_EVENT_CONTROLLER: ControllerEvent(track, event); break; case MIDI_EVENT_PROGRAM_CHANGE: ProgramChangeEvent(track, event); break; case MIDI_EVENT_PITCH_BEND: PitchBendEvent(track, event); break; case MIDI_EVENT_META: MetaEvent(track, event); break; // SysEx events can be ignored. case MIDI_EVENT_SYSEX: case MIDI_EVENT_SYSEX_SPLIT: break; default: #ifdef OPL_MIDI_DEBUG fprintf(stderr, "Unknown MIDI event type %i\n", event->event_type); #endif break; } } static void ScheduleTrack(opl_track_data_t *track); // Restart a song from the beginning. static void RestartSong(void *unused) { unsigned int i; running_tracks = num_tracks; for (i=0; i<num_tracks; ++i) { MIDI_RestartIterator(tracks[i].iter); ScheduleTrack(&tracks[i]); } } // Callback function invoked when another event needs to be read from // a track. static void TrackTimerCallback(void *arg) { opl_track_data_t *track = arg; midi_event_t *event; // Get the next event and process it. if (!MIDI_GetNextEvent(track->iter, &event)) { return; } ProcessEvent(track, event); // End of track? if (event->event_type == MIDI_EVENT_META && event->data.meta.type == MIDI_META_END_OF_TRACK) { --running_tracks; // When all tracks have finished, restart the song. // Don't restart the song immediately, but wait for 5ms // before triggering a restart. Otherwise it is possible // to construct an empty MIDI file that causes the game // to lock up in an infinite loop. (5ms should be short // enough not to be noticeable by the listener). if (running_tracks <= 0 && song_looping) { OPL_SetCallback(5, RestartSong, NULL); } return; } // Reschedule the callback for the next event in the track. ScheduleTrack(track); } static void ScheduleTrack(opl_track_data_t *track) { unsigned int nticks; unsigned int ms; static int total = 0; // Get the number of milliseconds until the next event. nticks = MIDI_GetDeltaTime(track->iter); ms = (nticks * track->ms_per_beat) / track->ticks_per_beat; total += ms; // Set a timer to be invoked when the next event is // ready to play. OPL_SetCallback(ms, TrackTimerCallback, track); } // Initialize a channel. static void InitChannel(opl_track_data_t *track, opl_channel_data_t *channel) { // TODO: Work out sensible defaults? channel->instrument = &main_instrs[0]; channel->volume = 127; channel->bend = 0; } // Start a MIDI track playing: static void StartTrack(midi_file_t *file, unsigned int track_num) { opl_track_data_t *track; unsigned int i; track = &tracks[track_num]; track->iter = MIDI_IterateTrack(file, track_num); track->ticks_per_beat = MIDI_GetFileTimeDivision(file); // Default is 120 bpm. // TODO: this is wrong track->ms_per_beat = 500 * 260; for (i=0; i<MIDI_CHANNELS_PER_TRACK; ++i) { InitChannel(track, &track->channels[i]); } // Schedule the first event. ScheduleTrack(track); } // Start playing a mid static void I_OPL_PlaySong(void *handle, boolean looping) { midi_file_t *file; unsigned int i; if (!music_initialized || handle == NULL) { return; } file = handle; // Allocate track data. tracks = malloc(MIDI_NumTracks(file) * sizeof(opl_track_data_t)); num_tracks = MIDI_NumTracks(file); running_tracks = num_tracks; song_looping = looping; for (i=0; i<num_tracks; ++i) { StartTrack(file, i); } } static void I_OPL_PauseSong(void) { unsigned int i; if (!music_initialized) { return; } // Pause OPL callbacks. OPL_SetPaused(1); // Turn off all main instrument voices (not percussion). // This is what Vanilla does. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel != NULL && voices[i].current_instr < percussion_instrs) { VoiceKeyOff(&voices[i]); } } } static void I_OPL_ResumeSong(void) { if (!music_initialized) { return; } OPL_SetPaused(0); } static void I_OPL_StopSong(void) { unsigned int i; if (!music_initialized) { return; } OPL_Lock(); // Stop all playback. OPL_ClearCallbacks(); // Free all voices. for (i=0; i<OPL_NUM_VOICES; ++i) { if (voices[i].channel != NULL) { VoiceKeyOff(&voices[i]); ReleaseVoice(&voices[i]); } } // Free all track data. for (i=0; i<num_tracks; ++i) { MIDI_FreeIterator(tracks[i].iter); } free(tracks); tracks = NULL; num_tracks = 0; OPL_Unlock(); } static void I_OPL_UnRegisterSong(void *handle) { if (!music_initialized) { return; } if (handle != NULL) { MIDI_FreeFile(handle); } } // Determine whether memory block is a .mid file static boolean IsMid(byte *mem, int len) { return len > 4 && !memcmp(mem, "MThd", 4); } static boolean ConvertMus(byte *musdata, int len, char *filename) { MEMFILE *instream; MEMFILE *outstream; void *outbuf; size_t outbuf_len; int result; instream = mem_fopen_read(musdata, len); outstream = mem_fopen_write(); result = mus2mid(instream, outstream); if (result == 0) { mem_get_buf(outstream, &outbuf, &outbuf_len); M_WriteFile(filename, outbuf, outbuf_len); } mem_fclose(instream); mem_fclose(outstream); return result; } static void *I_OPL_RegisterSong(void *data, int len) { midi_file_t *result; char *filename; if (!music_initialized) { return NULL; } // MUS files begin with "MUS" // Reject anything which doesnt have this signature filename = M_TempFile("doom.mid"); if (IsMid(data, len) && len < MAXMIDLENGTH) { M_WriteFile(filename, data, len); } else { // Assume a MUS file and try to convert ConvertMus(data, len, filename); } result = MIDI_LoadFile(filename); if (result == NULL) { fprintf(stderr, "I_OPL_RegisterSong: Failed to load MID.\n"); } // remove file now remove(filename); Z_Free(filename); return result; } // Is the song playing? static boolean I_OPL_MusicIsPlaying(void) { if (!music_initialized) { return false; } return num_tracks > 0; } // Shutdown music static void I_OPL_ShutdownMusic(void) { if (music_initialized) { // Stop currently-playing track, if there is one: I_OPL_StopSong(); OPL_Shutdown(); // Release GENMIDI lump W_ReleaseLumpName("GENMIDI"); music_initialized = false; } } // Initialize music subsystem static boolean I_OPL_InitMusic(void) { OPL_SetSampleRate(snd_samplerate); if (!OPL_Init(opl_io_port)) { printf("Dude. The Adlib isn't responding.\n"); return false; } // Load instruments from GENMIDI lump: if (!LoadInstrumentTable()) { OPL_Shutdown(); return false; } InitVoices(); tracks = NULL; num_tracks = 0; music_initialized = true; return true; } static snddevice_t music_opl_devices[] = { SNDDEVICE_ADLIB, SNDDEVICE_SB, }; music_module_t music_opl_module = { music_opl_devices, arrlen(music_opl_devices), I_OPL_InitMusic, I_OPL_ShutdownMusic, I_OPL_SetMusicVolume, I_OPL_PauseSong, I_OPL_ResumeSong, I_OPL_RegisterSong, I_OPL_UnRegisterSong, I_OPL_PlaySong, I_OPL_StopSong, I_OPL_MusicIsPlaying, }; //---------------------------------------------------------------------- // // Development / debug message generation, to help developing GENMIDI // lumps. // //---------------------------------------------------------------------- static int NumActiveChannels(void) { int i; for (i = MIDI_CHANNELS_PER_TRACK - 1; i >= 0; --i) { if (tracks[0].channels[i].instrument != &main_instrs[0]) { return i + 1; } } return 0; } static int ChannelInUse(opl_channel_data_t *channel) { opl_voice_t *voice; for (voice = voice_alloced_list; voice != NULL; voice = voice->next) { if (voice->channel == channel) { return 1; } } return 0; } void I_OPL_DevMessages(char *result) { int instr_num; int lines; int i; if (num_tracks == 0) { sprintf(result, "No OPL track!"); return; } sprintf(result, "Tracks:\n"); lines = 1; for (i = 0; i < NumActiveChannels(); ++i) { if (tracks[0].channels[i].instrument == NULL) { continue; } instr_num = tracks[0].channels[i].instrument - main_instrs; sprintf(result + strlen(result), "chan %i: %c i#%i (%s)\n", i, ChannelInUse(&tracks[0].channels[i]) ? '\'' : ' ', instr_num + 1, main_instr_names[instr_num]); ++lines; } sprintf(result + strlen(result), "\nLast percussion:\n"); lines += 2; i = (last_perc_count + PERCUSSION_LOG_LEN - 1) % PERCUSSION_LOG_LEN; do { if (last_perc[i] == 0) { break; } sprintf(result + strlen(result), "%cp#%i (%s)\n", i == 0 ? '\'' : ' ', last_perc[i], percussion_names[last_perc[i] - 35]); ++lines; i = (i + PERCUSSION_LOG_LEN - 1) % PERCUSSION_LOG_LEN; } while (lines < 25 && i != last_perc_count); }