128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
#pragma once
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#include <stdint.h>
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#include "opl3.h"
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#include "opmfile.h"
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// OPMPlay setup defines
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#define OPMPLAY_ENABLE_STDIO
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#ifdef OPMPLAY_ENABLE_STDIO
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#endif
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// LXMPlay import defines
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#define opmplay_memcpy memcpy
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#define opmplay_memset memset
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#define opmplay_memcmp memcmp
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#define opmplay_alloc malloc
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#define opmplay_memfree free
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#define opmplay_debug_printf(...) printf(__VA_ARGS__)
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#ifdef __cplusplus
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extern "C" {
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#endif
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// general enums
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enum {
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OPMPLAY_MAX_CHANNLES = 9+1,
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};
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// return error codes
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enum {
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OPMPLAY_ERR_OK = 0,
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OPMPLAY_ERR_END_OF_STREAM = 1,
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OPMPLAY_ERR_BAD_FILE_STRUCTURE = -1,
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OPMPLAY_ERR_MEMALLOC = -2,
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OPMPLAY_ERR_NULLPTR = -3,
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OPMPLAY_ERR_NO_SOUNDRAM = -4,
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OPMPLAY_ERR_DEVICE = -5,
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OPMPLAY_ERR_BAD_PARAMETER = -6,
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OPMPLAY_ERR_IO = -7,
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OPMPLAY_ERR_UNKNOWN = -20,
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};
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enum {
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OPMPLAY_IO_USER = 0,
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OPMPLAY_IO_FILE = 1,
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OPMPLAY_IO_MEMORY = 2,
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};
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// file I/O structs
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struct opmplay_io_t {
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uint32_t type; // i/o type
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union {
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void* buf;
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#ifdef OPMPLAY_ENABLE_STDIO
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FILE* io;
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#endif
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};
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uint32_t size;
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// internal
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uint32_t offset;
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uint32_t(*read)(opmplay_io_t* io, void* dst, uint32_t size); // returns bytes read
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uint32_t(*seek)(opmplay_io_t* io, uint32_t offset); // returns 0 if success
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};
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struct opmplay_channel_context_t {
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// TODO: internal registers (skipped atm)
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uint8_t block; // used to track key on/off changes
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// stream data
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struct {
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uint32_t samples_to_play;
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uint32_t delay;
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uint32_t reload;
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uint8_t* data;
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uint8_t* ptr;
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uint8_t* loop; // if active
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} stream;
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};
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struct opmplay_context_t {
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// LXM file header
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opm_header_t header;
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// channel context
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opmplay_channel_context_t channels[1+9];
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// position data
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struct {
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uint32_t order;
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uint32_t frame;
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uint32_t samples;
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uint32_t looped;
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} pos;
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};
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// init context
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int opmplay_init(opmplay_context_t* ctx);
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// free context
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int opmplay_free(opmplay_context_t* ctx);
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// load file header
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int opmplay_load_header(opmplay_context_t* ctx, opmplay_io_t* io);
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// load file contents
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int opmplay_load_module(opmplay_context_t* ctx, opmplay_io_t* io);
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// reset to start
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int opmplay_rewind(opmplay_context_t* ctx);
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// play one tick, render changes to opl3 device
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int opmplay_tick(opmplay_context_t* ctx, opl3_chip *opl3);
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#ifdef __cplusplus
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}
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#endif
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