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part 4

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freq-mod 2024-08-12 19:25:53 +02:00
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src/engine/fileOps/ppc.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;
//PPC PMD's YM2608 ADPCM-B sample bank
/* ========================================
General
========================================
ADPCM RAM addresses: see docs/common.txt {
address_start = 0x0026
file_header_size = 0x0420
}
========================================
Header
========================================
0x0000 Identifier (30b)
"ADPCM DATA for PMD ver.4.4- "
0x001E Address of End of Data (32B blocks) in ADPCM RAM (1h)
File Size == address -> file offset
0x0020 - 0x041F 256 * {
Start of Sample (32b blocks) in ADPCM RAM (1h)
End of Sample (32b blocks) in ADPCM RAM (1h)
(0x0000 0x0000 -> no sample for this instrument ID)
}
========================================
Body
========================================
Stream of Sample Data {
Yamaha ADPCM-B encoding (4-Bit Signed ADPCM)
Mono
16kHz
(above sample rate according to KAJA's documentation
any sample rate possible, for different base note & octave)
} */
#define PPC_FILE_SIG "ADPCM DATA for PMD ver.4.4- "
#define PPC_BANK_SIZE 256
#define PPC_SAMPLE_RATE 16000
typedef struct
{
uint16_t start_pointer;
uint16_t end_pointer;
} PPC_HEADER;
#define UNUSED(x) (void)(x)
#define ADPCM_DATA_START 0x0420
void DivEngine::loadPPC(SafeReader& reader, std::vector<DivSample*>& ret, String& stripPath)
{
try
{
reader.seek(0, SEEK_SET);
String file_sig = reader.readString(30);
unsigned short end_of_data = (unsigned short)reader.readS();
UNUSED(end_of_data);
if(file_sig != PPC_FILE_SIG) return;
PPC_HEADER headers[PPC_BANK_SIZE];
for(int i = 0; i < PPC_BANK_SIZE; i++)
{
headers[i].start_pointer = (unsigned short)reader.readS();
headers[i].end_pointer = (unsigned short)reader.readS();
}
for(int i = 0; i < PPC_BANK_SIZE; i++)
{
if((headers[i].start_pointer != 0 || headers[i].end_pointer != 0) && headers[i].start_pointer < headers[i].end_pointer)
{
DivSample* s = new DivSample;
s->rate = PPC_SAMPLE_RATE;
s->centerRate = PPC_SAMPLE_RATE;
s->depth = DIV_SAMPLE_DEPTH_ADPCM_B;
s->init((headers[i].end_pointer - headers[i].start_pointer) * 32 * 2);
int sample_pos = 0;
int sample_length = (headers[i].end_pointer - headers[i].start_pointer) * 32;
//reader.seek(ADPCM_DATA_START + headers[i].start_pointer * 32, SEEK_SET);
for(int j = 0; j < sample_length; j++)
{
unsigned char curr_byte = (unsigned char)reader.readC();
//curr_byte=(curr_byte<<4)|(curr_byte>>4);
s->dataB[sample_pos] = curr_byte;
sample_pos++;
}
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);
ret.push_back(s);
}
}
}
catch (EndOfFileException& e)
{
lastError=_LE("premature end of file");
logE("premature end of file");
}
}