319 lines
11 KiB
C++
319 lines
11 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) {
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if (ctx == NULL) return OPMPLAY_ERR_NULLPTR;
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opmplay_memset(ctx, 0, sizeof(opmplay_context_t));
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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 < OPMPLAY_MAX_CHANNLES; 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))))
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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) * (OPMPLAY_MAX_CHANNLES));
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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) * (OPMPLAY_MAX_CHANNLES))
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!= sizeof(opm_header_stream_desc_t) * (OPMPLAY_MAX_CHANNLES))
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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 < OPMPLAY_MAX_CHANNLES; ch++) {
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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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// 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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int opmplay_loop(opmplay_context_t* ctx) {
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// channel streams
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for (int ch = 0; ch < OPMPLAY_MAX_CHANNLES; ch++) {
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// init stack
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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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for (int ch = 0; ch < OPMPLAY_MAX_CHANNLES; ch++) {
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ctx->channels[ch].stream.loop = ctx->channels[ch].stream.data;
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}
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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 (TODO: OPL3)
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static int opmplay_opregs_channel_offset[] = {
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0, 1, 2, 8, 9, 0xA, 0x10, 0x11, 0x12
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};
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int opmplay_tick(opmplay_context_t* ctx, opl3_chip* opl3) {
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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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// 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(opl3, 0x001, *data++);
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if (mask & OPM_CTRL_SET_REG08) OPL3_WriteRegBuffered(opl3, 0x008, *data++);
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if (mask & OPM_CTRL_SET_REG105) OPL3_WriteRegBuffered(opl3, 0x105, *data++);
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if (mask & OPM_CTRL_SET_REG104) OPL3_WriteRegBuffered(opl3, 0x104, *data++);
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if (mask & OPM_CTRL_SET_REGBD) OPL3_WriteRegBuffered(opl3, 0x0BD, *data++);
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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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chctx->stream.ptr = data;
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}
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}
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// parse channel streams
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for (int ch = 0; ch < OPMPLAY_MAX_CHANNLES - 1; ch++) {
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opmplay_channel_context_t* chctx = ctx->channels + ch + 1;
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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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// get streams
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if ((*(data) & 0xE0) == OPM_SET_MULT_WAVE_TL) {
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int mask = *data;
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int op = (mask & OPM_CMD80_SELECT_OPERATOR ? 3 : 0) + opmplay_opregs_channel_offset[ch];
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data++;
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if (mask & OPM_CMD80_SET_MULT) OPL3_WriteRegBuffered(opl3, 0x20+op, *data++);
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if (mask & OPM_CMD80_SET_TL) OPL3_WriteRegBuffered(opl3, 0x40+op, *data++);
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if (mask & OPM_CMD80_SET_WAVEFORM) OPL3_WriteRegBuffered(opl3, 0xE0+op, *data++);
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continue;
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}
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if ((*(data) & 0xF0) == OPM_SET_ADSR) {
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int mask = *data;
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int op = (mask & OPM_CMDA0_SELECT_OPERATOR ? 3 : 0) + opmplay_opregs_channel_offset[ch];
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data++;
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if (mask & OPM_CMDA0_SET_AD) OPL3_WriteRegBuffered(opl3, 0x60 + op, *data++);
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if (mask & OPM_CMDA0_SET_SR) OPL3_WriteRegBuffered(opl3, 0x80 + op, *data++);
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continue;
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}
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if ((*(data) & 0xF0) == OPM_SET_FREQ_FB) {
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int mask = *data;
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data++;
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if (mask & OPM_CMDB0_SET_FEEDBACK) OPL3_WriteRegBuffered(opl3, 0xC0 + ch, *data++);
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if (mask & OPM_CMDB0_SET_FREQ_LOW) OPL3_WriteRegBuffered(opl3, 0xA0 + ch, *data++);
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if (mask & OPM_CMDB0_SET_FREQ_HIGH) OPL3_WriteRegBuffered(opl3, 0xB0 + ch, *data++);
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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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chctx->stream.ptr = data;
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}
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}
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return rtn;
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}
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