430 lines
16 KiB
C++
430 lines
16 KiB
C++
#include <stdint.h>
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#include "opmplay.h"
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#include "opmfile.h"
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// -------------------------
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// file I/O procedures
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static uint32_t opmplay_mem_read(opmplay_io_t* io, void* dst, uint32_t size) {
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if ((io == NULL) || dst == NULL) return OPMPLAY_ERR_NULLPTR;
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if ((size + io->offset) > io->size) return OPMPLAY_ERR_IO;
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opmplay_memcpy(dst, (uint8_t*)io->buf + io->offset, io->size);
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io->offset += io->size;
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return size;
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}
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static uint32_t opmplay_mem_seek(opmplay_io_t* io, uint32_t pos) {
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if (io == NULL) return OPMPLAY_ERR_NULLPTR;
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if (pos > io->size) return OPMPLAY_ERR_IO;
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io->offset = pos;
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return 0;
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}
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#ifdef OPMPLAY_ENABLE_STDIO
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static uint32_t opmplay_file_read(opmplay_io_t* io, void* dst, uint32_t size) {
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return fread(dst, 1, size, io->io);
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}
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static uint32_t opmplay_file_seek(opmplay_io_t* io, uint32_t pos) {
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return fseek(io->io, pos, SEEK_SET);
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}
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#endif
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// -------------------------
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int opmplay_init(opmplay_context_t* ctx, opl3_chip* chip) {
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if ((ctx == NULL) || (chip == NULL)) return OPMPLAY_ERR_NULLPTR;
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opmplay_memset(ctx, 0, sizeof(opmplay_context_t));
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ctx->chip = chip;
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return OPMPLAY_ERR_OK;
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}
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int opmplay_free(opmplay_context_t* ctx)
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{
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for (int ch = 0; ch < ctx->header.channels+1; ch++) {
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if (ctx->channels[ch].stream.data != NULL) {
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opmplay_memfree(ctx->channels[ch].stream.data); ctx->channels[ch].stream.data = NULL;
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}
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}
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return OPMPLAY_ERR_OK;
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}
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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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if ((ctx == NULL) || (io == NULL)) return OPMPLAY_ERR_NULLPTR;
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// init file I/O handlers
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switch (io->type) {
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#ifdef OPMPLAY_ENABLE_STDIO
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case OPMPLAY_IO_FILE:
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io->read = &opmplay_file_read;
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io->seek = &opmplay_file_seek;
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break;
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#endif
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case OPMPLAY_IO_MEMORY:
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io->read = &opmplay_mem_read;
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io->seek = &opmplay_mem_seek;
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break;
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case OPMPLAY_IO_USER:
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// use user-provided I/O functions
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if ((io->read == NULL) || (io->seek == NULL)) return OPMPLAY_ERR_BAD_PARAMETER;
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break;
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default:
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return OPMPLAY_ERR_BAD_PARAMETER;
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}
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// read header
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if (io->read(io, &ctx->header, sizeof(ctx->header)) != sizeof(ctx->header)) return OPMPLAY_ERR_IO;
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// and validate it
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if ((opmplay_memcmp(ctx->header.magic, "OPM\x1A", sizeof(ctx->header.magic))) || (ctx->header.version.v != OPM_FORMAT_VERSION))
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return OPMPLAY_ERR_BAD_FILE_STRUCTURE;
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// done for now, waiting for opmplay_load_module :)
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return OPMPLAY_ERR_OK;
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}
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int opmplay_load_module(opmplay_context_t* ctx, opmplay_io_t* io) {
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if ((ctx == NULL) || (io == NULL)) return OPMPLAY_ERR_NULLPTR;
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uint32_t filepos = sizeof(opm_header_t);
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// allocate and copy stream data
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opm_header_stream_desc_t* streamdesc = (opm_header_stream_desc_t*)opmplay_alloc(sizeof(opm_header_stream_desc_t) * (ctx->header.channels + 1));
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if (streamdesc == NULL) return OPMPLAY_ERR_NULLPTR;
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if (io->seek(io, filepos)) return OPMPLAY_ERR_IO;
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if (io->read(io, streamdesc, sizeof(opm_header_stream_desc_t) * (ctx->header.channels + 1))
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!= sizeof(opm_header_stream_desc_t) * (ctx->header.channels + 1))
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return OPMPLAY_ERR_IO;
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// allocate and copy channel streams
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for (int ch = 0; ch < ctx->header.channels + 1; ch++) {
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if (streamdesc[ch].size > 0) {
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ctx->channels[ch].stream.data = (uint8_t*)opmplay_alloc(sizeof(uint8_t*) * (streamdesc[ch].size));
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if (ctx->channels[ch].stream.data == NULL) return OPMPLAY_ERR_MEMALLOC;
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if (io->read(io, ctx->channels[ch].stream.data, streamdesc[ch].size) != streamdesc[ch].size) return OPMPLAY_ERR_IO;
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ctx->channels[ch].stream.delay = 1;
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}
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else ctx->channels[ch].stream.data = NULL;
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}
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// rewind to start
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opmplay_rewind(ctx);
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// done :)
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return OPMPLAY_ERR_OK;
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}
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void opmplay_pop_stack(opmplay_channel_context_t* chctx) {
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opmplay_channel_stack_t* st = chctx->stack + (--chctx->stack_pos);
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chctx->stream.ptr = st->ptr;
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chctx->stream.samples_to_play = st->frames_to_play;
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}
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void opmplay_push_stack(opmplay_channel_context_t* chctx) {
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opmplay_channel_stack_t* st = chctx->stack + chctx->stack_pos;
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st->ptr = chctx->stream.ptr;
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st->frames_to_play = chctx->stream.samples_to_play;
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chctx->stack_pos++;
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}
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int opmplay_loop(opmplay_context_t* ctx) {
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// channel streams
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for (int ch = 0; ch < ctx->header.channels + 1; ch++) {
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// init stack
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ctx->channels[ch].stack_pos = 0;
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ctx->channels[ch].stream.samples_to_play = -1;
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ctx->channels[ch].stream.ptr = ctx->channels[ch].stream.loop;
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ctx->channels[ch].stream.delay = ctx->channels[ch].stream.reload = 1;
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}
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return OPMPLAY_ERR_OK;
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}
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int opmplay_rewind(opmplay_context_t* ctx) {
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// set chip mode
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switch (ctx->header.flags & OPM_FLAG_CHIP_TYPE) {
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case OPM_FLAG_CHIP_OPL3:
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// set OPL3 mode
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OPL3_WriteRegBuffered(ctx->chip, 0x105, 0x01);
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// disable 4-op
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OPL3_WriteRegBuffered(ctx->chip, 0x104, 0x00);
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// send key off for every channel
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for (int ch = 0; ch < 9; ch++) {
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OPL3_WriteRegBuffered(ctx->chip, 0x0B0 + ch, 0x00);
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OPL3_WriteRegBuffered(ctx->chip, 0x1B0 + ch, 0x00);
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}
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break;
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case OPM_FLAG_CHIP_OPL2:
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// enable waveforms
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OPL3_WriteRegBuffered(ctx->chip, 0x001, 0x20);
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// send key off for every channel
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for (int ch = 0; ch < 9; ch++) {
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OPL3_WriteRegBuffered(ctx->chip, 0x0B0 + ch, 0x00);
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}
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break;
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default: return OPMPLAY_ERR_DEVICE;
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}
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for (int ch = 0; ch < ctx->header.channels + 1; ch++) {
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ctx->channels[ch].stream.loop = ctx->channels[ch].stream.data;
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}
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ctx->_4op = 0;
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opmplay_loop(ctx);
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return OPMPLAY_ERR_OK;
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}
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// get and parse delay
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static uint32_t opmplay_set_delay(uint8_t** data) {
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uint32_t delay = 0;
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if (**data == OPM_STREAM_DELAY_INT32) {
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delay = (
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(*(*data + 1) << 0) |
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(*(*data + 2) << 8) |
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(*(*data + 3) << 16) |
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(*(*data + 4) << 24)
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);
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*data += 5;
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}
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else if (**data == OPM_STREAM_DELAY_INT16) {
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delay = (
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(*(*data + 1) << 0) |
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(*(*data + 2) << 8)
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);
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*data += 3;
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}
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else if ((**data & 0xF0) == OPM_STREAM_DELAY_INT12) {
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delay = ((**data & 0x0F) << 8) | (*(*data + 1));
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*data += 2;
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}
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else if ((**data & 0xF0) == OPM_STERAM_DELAY_SHORT) {
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delay = (**data & 0xF) + 1;
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(*data)++;
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}
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return delay;
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}
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// translation tables
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static int opmplay_opregs_channel_offset[] = {
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0x000, 0x001, 0x002, 0x008, 0x009, 0x00A, 0x010, 0x011, 0x012,
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0x100, 0x101, 0x102, 0x108, 0x109, 0x10A, 0x110, 0x111, 0x112,
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};
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static int opmplay_regs_channel_offset[] = {
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0x000, 0x001, 0x002, 0x003, 0x004, 0x005, 0x006, 0x007, 0x008,
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0x100, 0x101, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107, 0x108,
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};
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static int opmplay_4op_bit_offset[] = {
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1<<0, 1<<1, 1<<2, 0, 0, 0, 0, 0, 0,
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1<<3, 1<<4, 1<<5, 0, 0, 0, 0, 0, 0,
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};
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static int opmplay_ch_parsing_order[] = {
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3, 0, 4, 1, 5, 2, 6, 7, 8,
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12, 9, 13, 10, 14, 11, 15, 16, 17
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};
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int opmplay_tick(opmplay_context_t* ctx) {
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int ch = 0;
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int rtn = OPMPLAY_ERR_OK;
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uint32_t newdelay = 0;
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// parse channel streams
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for (int i = 0; i < ctx->header.channels; i++) {
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int ch = opmplay_ch_parsing_order[i]; // mangle channel order to make 4op mode work
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opmplay_channel_context_t* chctx = ctx->channels + ch + 1;
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uint8_t* data = chctx->stream.ptr; if (data == NULL) continue;
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bool isRun = true;
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if (--chctx->stream.delay == 0) {
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while (isRun) {
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// get streams
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if ((*(data) & 0x80) == OPM_SET_OPERATOR) {
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int mask = *data;
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int op = (mask & OPM_CMD00_SELECT_OPERATOR ? 3 : 0) + opmplay_opregs_channel_offset[ch];
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data++;
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if (mask & OPM_CMD00_SET_MULT) OPL3_WriteRegBuffered(ctx->chip, 0x20 + op, *data++);
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if (mask & OPM_CMD00_SET_TL) OPL3_WriteRegBuffered(ctx->chip, 0x40 + op, *data++);
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if (mask & OPM_CMD00_SET_AD) OPL3_WriteRegBuffered(ctx->chip, 0x60 + op, *data++);
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if (mask & OPM_CMD00_SET_SR) OPL3_WriteRegBuffered(ctx->chip, 0x80 + op, *data++);
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if (mask & OPM_CMD00_SET_WAVEFORM) OPL3_WriteRegBuffered(ctx->chip, 0xE0 + op, *data++);
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if (mask & OPM_CMD00_END_OF_FRAME) isRun = false;
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continue;
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}
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if ((*(data) & 0xC0) == OPM_SET_FREQ_FB_VOL) {
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int mask = *data;
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data++;
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if (mask & OPM_CMD80_SET_TL0) OPL3_WriteRegBuffered(ctx->chip, 0x40 + opmplay_opregs_channel_offset[ch], *data++);
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if (mask & OPM_CMD80_SET_TL1) OPL3_WriteRegBuffered(ctx->chip, 0x43 + opmplay_opregs_channel_offset[ch], *data++);
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if (mask & OPM_CMD80_SET_FEEDBACK) OPL3_WriteRegBuffered(ctx->chip, 0xC0 + opmplay_regs_channel_offset[ch], *data++);
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if (mask & OPM_CMD80_SET_FREQ) OPL3_WriteRegBuffered(ctx->chip, 0xA0 + opmplay_regs_channel_offset[ch], *data++);
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if (mask & OPM_CMD80_SET_KEYBLOCK) { chctx->block = *data; OPL3_WriteRegBuffered(ctx->chip, 0xB0 + opmplay_regs_channel_offset[ch], *data++); };
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if (mask & OPM_CMD80_END_OF_FRAME) isRun = false;
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continue;
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}
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if ((*data & 0xFC) == OPM_KEY_TRIGGER) {
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if (*data & OPM_KEY_ON) chctx->block |= (1 << 5); else chctx->block &= ~(1 << 5);
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OPL3_WriteRegBuffered(ctx->chip, 0xB0 + opmplay_regs_channel_offset[ch], chctx->block);
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if (*data & OPM_KEY_END_OF_FRAME) isRun = false;
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data++;
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continue;
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}
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if ((*data & 0xFE) == OPM_4OP_TRIGGER) {
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if (opmplay_4op_bit_offset[ch] != 0) {
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if (*data & OPM_4OP_ON) ctx->_4op |= opmplay_4op_bit_offset[ch]; else ctx->_4op &= ~opmplay_4op_bit_offset[ch];
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OPL3_WriteRegBuffered(ctx->chip, 0x104, ctx->_4op);
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}
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data++;
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continue;
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}
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if ((*data & 0xF0) == OPM_STREAM_BACKREF) {
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// back reference, nested call :)
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int distance = ((*(data + 0) & 0x0F) << 8) | (*(data + 1));
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int frames_to_play = *(data + 2);
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chctx->stream.ptr = data + 3;
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opmplay_push_stack(chctx);
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data -= distance;
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chctx->stream.samples_to_play = frames_to_play; // hack?
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continue;
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}
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// check for common stuff
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switch (*data) {
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case OPM_STREAM_END:
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// end of current stream, delay forever
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chctx->stream.reload = -1;
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isRun = false;
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break;
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// just an NOP, break
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case OPM_STREAM_NEW_ORDER:
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case OPM_STREAM_NOP:
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data++;
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break;
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case OPM_STREAM_LOOP:
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// save loop point
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chctx->stream.loop = data;
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data++;
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break;
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case OPM_STREAM_END_FRAME:
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// end of frame - special case here
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data++;
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isRun = false;
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break;
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default:
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// test for delay
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newdelay = opmplay_set_delay(&data);
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if (newdelay > 0) {
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chctx->stream.reload = newdelay;
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}
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else
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{
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printf("unknonw token %02x!\n", *data);
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return OPMPLAY_ERR_BAD_FILE_STRUCTURE;
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}
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}
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}
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chctx->stream.delay = chctx->stream.reload;
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// decrement samples to play counter
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if (--chctx->stream.samples_to_play == 0) {
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// pop context from the stack
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do opmplay_pop_stack(chctx); while (--chctx->stream.samples_to_play == 0);
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}
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else {
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// save data pointer
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chctx->stream.ptr = data;
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}
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}
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}
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// process control stream
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{
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opmplay_channel_context_t* chctx = ctx->channels + 0;
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uint8_t* data = chctx->stream.ptr;
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bool isRun = true;
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if (--chctx->stream.delay == 0) {
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while (isRun) {
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if ((*(data) & 0xE0) == OPM_CTRL_REG_SET) {
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int mask = *data;
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data++;
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if (mask & OPM_CTRL_SET_REG01) OPL3_WriteRegBuffered(ctx->chip, 0x001, *data++);
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if (mask & OPM_CTRL_SET_REG08) OPL3_WriteRegBuffered(ctx->chip, 0x008, *data++);
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if (mask & OPM_CTRL_SET_REG105) OPL3_WriteRegBuffered(ctx->chip, 0x105, *data++);
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if (mask & OPM_CTRL_SET_REG104) OPL3_WriteRegBuffered(ctx->chip, 0x104, *data++);
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if (mask & OPM_CTRL_SET_REGBD) OPL3_WriteRegBuffered(ctx->chip, 0x0BD, *data++);
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continue;
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}
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if ((*data & 0xF0) == OPM_STREAM_BACKREF) {
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// back reference, nested call :)
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int distance = ((*(data + 0) & 0x0F) << 8) | (*(data + 1));
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int frames_to_play = *(data + 2);
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chctx->stream.ptr = data + 3;
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opmplay_push_stack(chctx);
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data -= distance;
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chctx->stream.samples_to_play = frames_to_play; // hack?
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continue;
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}
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// check for common stuff
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switch (*data) {
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// end of stream - rewind everything
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case OPM_STREAM_END:
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opmplay_loop(ctx);
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isRun = false;
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return OPMPLAY_ERR_END_OF_STREAM;
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// just an NOP, break
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case OPM_STREAM_NEW_ORDER:
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case OPM_STREAM_NOP:
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data++;
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break;
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case OPM_STREAM_LOOP:
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// save loop point
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ctx->pos.looped = ctx->pos.frame;
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chctx->stream.loop = data;
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data++;
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break;
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// set new frame rate
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case OPM_STREAM_SET_FRAME_RATE:
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ctx->header.frame_rate = *(uint16_t*)(data + 1); data += 3;
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break;
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case OPM_STREAM_END_FRAME:
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// end of frame - special case here
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data++;
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isRun = false;
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break;
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default:
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// test for delay
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newdelay = opmplay_set_delay(&data);
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if (newdelay > 0) {
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chctx->stream.reload = newdelay;
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}
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else
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{
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printf("unknonw token %02x!\n", *data);
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return OPMPLAY_ERR_BAD_FILE_STRUCTURE;
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}
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}
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}
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chctx->stream.delay = chctx->stream.reload;
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// decrement samples to play counter
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if (--chctx->stream.samples_to_play == 0) {
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// pop context from the stack
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do opmplay_pop_stack(chctx); while (--chctx->stream.samples_to_play == 0);
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}
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else {
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// save data pointer
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chctx->stream.ptr = data;
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}
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}
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}
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ctx->pos.frame++;
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return rtn;
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}
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