149 lines
4 KiB
C++
149 lines
4 KiB
C++
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/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2024 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "shared.h"
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#ifdef HAVE_GUI
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#include "../gui/gui.h"
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extern FurnaceGUI g;
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#endif
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#define _LE(string) (string)
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class DivEngine;
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//PPC PMD's YM2608 ADPCM-B sample bank
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/* ========================================
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General
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========================================
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ADPCM RAM addresses: see docs/common.txt {
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address_start = 0x0026
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file_header_size = 0x0420
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}
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========================================
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Header
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========================================
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0x0000 Identifier (30b)
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"ADPCM DATA for PMD ver.4.4- "
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0x001E Address of End of Data (32B blocks) in ADPCM RAM (1h)
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File Size == address -> file offset
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0x0020 - 0x041F 256 * {
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Start of Sample (32b blocks) in ADPCM RAM (1h)
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End of Sample (32b blocks) in ADPCM RAM (1h)
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(0x0000 0x0000 -> no sample for this instrument ID)
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}
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========================================
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Body
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========================================
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Stream of Sample Data {
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Yamaha ADPCM-B encoding (4-Bit Signed ADPCM)
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Mono
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16kHz
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(above sample rate according to KAJA's documentation
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any sample rate possible, for different base note & octave)
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} */
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#define PPC_FILE_SIG "ADPCM DATA for PMD ver.4.4- "
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#define PPC_BANK_SIZE 256
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#define PPC_SAMPLE_RATE 16000
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typedef struct
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{
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uint16_t start_pointer;
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uint16_t end_pointer;
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} PPC_HEADER;
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#define UNUSED(x) (void)(x)
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#define ADPCM_DATA_START 0x0420
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void DivEngine::loadPPC(SafeReader& reader, std::vector<DivSample*>& ret, String& stripPath)
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{
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try
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{
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reader.seek(0, SEEK_SET);
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String file_sig = reader.readString(30);
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unsigned short end_of_data = (unsigned short)reader.readS();
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UNUSED(end_of_data);
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if(file_sig != PPC_FILE_SIG) return;
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PPC_HEADER headers[PPC_BANK_SIZE];
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for(int i = 0; i < PPC_BANK_SIZE; i++)
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{
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headers[i].start_pointer = (unsigned short)reader.readS();
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headers[i].end_pointer = (unsigned short)reader.readS();
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}
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for(int i = 0; i < PPC_BANK_SIZE; i++)
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{
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if((headers[i].start_pointer != 0 || headers[i].end_pointer != 0) && headers[i].start_pointer < headers[i].end_pointer)
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{
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DivSample* s = new DivSample;
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s->rate = PPC_SAMPLE_RATE;
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s->centerRate = PPC_SAMPLE_RATE;
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s->depth = DIV_SAMPLE_DEPTH_ADPCM_B;
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s->init((headers[i].end_pointer - headers[i].start_pointer) * 32 * 2);
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int sample_pos = 0;
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int sample_length = (headers[i].end_pointer - headers[i].start_pointer) * 32;
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//reader.seek(ADPCM_DATA_START + headers[i].start_pointer * 32, SEEK_SET);
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for(int j = 0; j < sample_length; j++)
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{
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unsigned char curr_byte = (unsigned char)reader.readC();
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//curr_byte=(curr_byte<<4)|(curr_byte>>4);
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s->dataB[sample_pos] = curr_byte;
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sample_pos++;
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}
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logI("ppc: start %d end %d len in bytes %d", headers[i].start_pointer, headers[i].end_pointer, (headers[i].end_pointer - headers[i].start_pointer) * 32);
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ret.push_back(s);
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}
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}
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}
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catch (EndOfFileException& e)
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{
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lastError=_LE("premature end of file");
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logE("premature end of file");
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}
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}
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