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part 4

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freq-mod 2024-08-12 19:25:53 +02:00
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commit d1e198ddff
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src/engine/fileOps/p86.cpp Normal file
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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2024 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "shared.h"
#ifdef HAVE_GUI
#include "../gui/gui.h"
extern FurnaceGUI g;
#endif
#define _LE(string) (string)
class DivEngine;
//P86 8-bit PCM sample bank
/* =======================================
Header
=======================================
0x0000 Identifier (12b)
"PCM86 DATA(\n)(\0)"
0x000C Targeted P86DRV version (1b)
version <high nibble>.<low nibble>
0x000D File Length (3b)
0x0010 - 0x060F 256 * {
Pointer to Sample Data Start (3b)
Length of Sample Data (3b)
(0x000000 0x000000 -> no sample for this instrument ID)
}
=======================================
Body
=======================================
Stream of Sample Data {
8-Bit Signed
Mono
16540Hz
(above sample rate according to KAJA's documentation
any sample rate possible, for different base note & octave)
} */
#define P86_BANK_SIZE 256
#define P86_SAMPLE_RATE 16540
#define P86_FILE_SIG "PCM86 DATA\n\0"
typedef struct
{
uint32_t start_pointer;
uint32_t sample_length;
} P86_HEADER;
#define UNUSED(x) (void)(x)
uint32_t read_3bytes(SafeReader& reader)
{
unsigned char arr[3];
for (int i = 0; i < 3; i++)
{
arr[i] = (unsigned char)reader.readC();
}
return (arr[0] | (arr[1] << 8) | (arr[2] << 16));
}
void DivEngine::loadP86(SafeReader& reader, std::vector<DivSample*>& ret, String& stripPath)
{
try
{
reader.seek(0, SEEK_SET);
P86_HEADER headers[P86_BANK_SIZE];
String file_sig = reader.readString(12);
if(file_sig != P86_FILE_SIG) return;
uint8_t version = reader.readC();
UNUSED(version);
uint32_t file_size = read_3bytes(reader);
UNUSED(file_size);
for(int i = 0; i < P86_BANK_SIZE; i++)
{
headers[i].start_pointer = read_3bytes(reader);
headers[i].sample_length = read_3bytes(reader);
}
for(int i = 0; i < P86_BANK_SIZE; i++)
{
if(headers[i].start_pointer != 0 && headers[i].sample_length != 0)
{
DivSample* s = new DivSample;
s->rate = P86_SAMPLE_RATE;
s->centerRate = P86_SAMPLE_RATE;
s->depth = DIV_SAMPLE_DEPTH_8BIT;
s->init(headers[i].sample_length); //byte per sample
reader.seek((int)headers[i].start_pointer, SEEK_SET);
int sample_pos = 0;
for(uint32_t j = 0; j < headers[i].sample_length; j++)
{
unsigned char curr_byte = (unsigned char)reader.readC();
//curr_byte += 0x80;
s->data8[sample_pos] = curr_byte;
sample_pos++;
}
ret.push_back(s);
logI("p86: start %06X len %06X", headers[i].start_pointer, headers[i].sample_length);
}
}
}
catch (EndOfFileException& e)
{
lastError=_LE("premature end of file");
logE("premature end of file");
}
}