90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
#pragma once
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#include <stdint.h>
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#pragma pack(push, 1)
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struct opm_header_stream_desc_t {
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//uint16_t ptr; // offset to data stream in paragraphs (bytes*16)
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uint16_t size; // stream data size in bytes
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};
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struct opm_header_t {
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char magic[4]; // "OPM\x1A"
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union {
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struct {
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uint8_t minor;
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uint8_t major;
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};
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uint16_t v;
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} version;
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uint16_t flags; // reserved
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uint16_t frame_rate; // [hz] = 0x1234dd/frame_rate
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uint8_t callstack_depth; // reserved, 0 at this moment
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uint8_t reserved;
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// opm_header_stream_desc_t stream[9 + 1]; // first is control stream
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};
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// OPM v0 stream data:
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enum {
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OPM_STREAM_END_FRAME = 0xFF, // end of frame, next channel
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OPM_STREAM_END = 0xFE, // end of stream, stop here or loop to OPM_STREAM_LOOP stream point
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OPM_STREAM_NOP = 0xFD,
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OPM_STREAM_NEW_ORDER = 0xFC, // nop, marks new order
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OPM_STREAM_SET_FRAME_RATE = 0xFB, // word rate (as in opm_header_t::frame_rate)
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OPM_STREAM_LOOP = 0xFA, // set loop point here
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OPM_KEY_TRIGGER = 0xF0, // set key on/off + optionally end of frame
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// delay commands
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OPM_STREAM_DELAY_INT32 = 0xF9, // dword delay
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OPM_STREAM_DELAY_INT16 = 0xF8, // word delay
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OPM_STREAM_DELAY_INT12 = 0xD0, // D0..DF - 0..4095 frames delay (hibyte in low 4 bits of command)
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OPM_STERAM_DELAY_SHORT = 0xC0, // C0..CF - 1..16 frames delay
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// back reference
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OPM_STREAM_BACKREF = 0xE0, // E0..EF - word backrefpos (12 bit), byte frames
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// setter commands
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OPM_SET_VOLUME = 0x00, // 00..7F - set volume (total level) for operator, end of frame
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OPM_SET_MULT_WAVE_TL = 0x80, // 80..9F - set mult/waveform/total level/ksr for operator
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OPM_SET_ADSR = 0xA0, // A0..AF - set attack/sustain/decay/release for operator
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OPM_SET_FREQ_FB = 0xB0, // B0..BF - set frequency + feedback
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// control register set
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OPM_CTRL_KEY_PERC = 0x00, // 00..7F - set key on/off for percussion, end of frame
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OPM_CTRL_REG_SET = 0x80, // 80..BF - set control registers
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// flags
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OPM_KEY_OFF = (0 << 0),
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OPM_KEY_ON = (1 << 0),
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OPM_KEY_END_OF_FRAME = (1 << 1),
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OPM_SET_VOLUME_END_OF_FRAME = (1 << 7),
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OPM_CMD80_SET_MULT = (1 << 0),
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OPM_CMD80_SET_TL = (1 << 1),
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OPM_CMD80_SET_WAVEFORM = (1 << 2),
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OPM_CMD80_SELECT_OPERATOR = (1 << 3),
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OPM_CMD80_END_OF_FRAME = (1 << 4),
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OPM_CMDA0_SET_AD = (1 << 0),
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OPM_CMDA0_SET_SR = (1 << 1),
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OPM_CMDA0_SELECT_OPERATOR = (1 << 2),
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OPM_CMDA0_END_OF_FRAME = (1 << 3),
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OPM_CMDB0_SET_FEEDBACK = (1 << 0),
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OPM_CMDB0_SET_FREQ_LOW = (1 << 1),
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OPM_CMDB0_SET_FREQ_HIGH = (1 << 2),
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OPM_CMDB0_END_OF_FRAME = (1 << 3),
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OPM_CTRL_SET_REG01 = (1 << 0),
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OPM_CTRL_SET_REG08 = (1 << 1),
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OPM_CTRL_SET_REG105 = (1 << 2),
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OPM_CTRL_SET_REG104 = (1 << 3),
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OPM_CTRL_SET_REGBD = (1 << 4),
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};
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#pragma pack(pop)
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