142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
/**
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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 "fileOpsCommon.h"
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class DivEngine;
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//P86 8-bit PCM sample bank
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/* =======================================
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Header
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=======================================
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0x0000 Identifier (12b)
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"PCM86 DATA(\n)(\0)"
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0x000C Targeted P86DRV version (1b)
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version <high nibble>.<low nibble>
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0x000D File Length (3b)
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0x0010 - 0x060F 256 * {
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Pointer to Sample Data Start (3b)
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Length of Sample Data (3b)
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(0x000000 0x000000 -> 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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8-Bit Signed
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Mono
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16540Hz
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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 P86_BANK_SIZE 256
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#define P86_SAMPLE_RATE 16540
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#define P86_FILE_SIG "PCM86 DATA\n\0"
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typedef struct
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{
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uint32_t start_pointer;
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uint32_t sample_length;
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} P86_HEADER;
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#define UNUSED(x) (void)(x)
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uint32_t read_3bytes(SafeReader& reader)
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{
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unsigned char arr[3];
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for (int i = 0; i < 3; i++)
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{
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arr[i] = (unsigned char)reader.readC();
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}
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return (arr[0] | (arr[1] << 8) | (arr[2] << 16));
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}
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void DivEngine::loadP86(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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P86_HEADER headers[P86_BANK_SIZE];
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String file_sig = reader.readString(12);
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if(file_sig != P86_FILE_SIG) return;
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uint8_t version = reader.readC();
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UNUSED(version);
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uint32_t file_size = read_3bytes(reader);
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UNUSED(file_size);
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for(int i = 0; i < P86_BANK_SIZE; i++)
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{
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headers[i].start_pointer = read_3bytes(reader);
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headers[i].sample_length = read_3bytes(reader);
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}
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for(int i = 0; i < P86_BANK_SIZE; i++)
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{
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if(headers[i].start_pointer != 0 && headers[i].sample_length != 0)
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{
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DivSample* s = new DivSample;
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s->rate = P86_SAMPLE_RATE;
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s->centerRate = P86_SAMPLE_RATE;
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s->depth = DIV_SAMPLE_DEPTH_8BIT;
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s->init(headers[i].sample_length); //byte per sample
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reader.seek((int)headers[i].start_pointer, SEEK_SET);
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int sample_pos = 0;
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for(uint32_t j = 0; j < headers[i].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 += 0x80;
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s->data8[sample_pos] = curr_byte;
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sample_pos++;
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}
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ret.push_back(s);
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logI("p86: start %06X len %06X", headers[i].start_pointer, headers[i].sample_length);
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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=_("premature end of file");
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logE("premature end of file");
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}
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} |