source/src/vm/pc8201/cmt.cpp

   1 /*
   2         NEC PC-8201 Emulator 'ePC-8201'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2013.04.22-
   6
   7         [ cmt (record only) ]
   8 */
   9
  10 #include "cmt.h"
  11
  12 #define SAMPLE_RATE 48000
  13
  14 void CMT::initialize()
  15 {
  16         fio = new FILEIO();
  17         rec = remote = false;
  18 }
  19
  20 void CMT::release()
  21 {
  22         close_tape();
  23         delete fio;
  24 }
  25
  26 void CMT::reset()
  27 {
  28         close_tape();
  29         rec = remote = false;
  30 }
  31
  32 void CMT::write_buffer(uint8_t value, int samples)
  33 {
  34         if(is_wav) {
  35                 for(int i = 0; i < samples; i++) {
  36                         buffer[bufcnt++] = value;
  37                         if(bufcnt == sizeof(buffer)) {
  38                                 fio->Fwrite(buffer, sizeof(buffer), 1);
  39                                 bufcnt = 0;
  40                         }
  41                 }
  42         } else {
  43                 value = (value > 128) ? 0x80 : 0;
  44                 while(samples > 0) {
  45                         int s = min(samples, 0x7f);
  46                         samples -= s;
  47                         buffer[bufcnt++] = value | s;
  48                         if(bufcnt == sizeof(buffer)) {
  49                                 fio->Fwrite(buffer, sizeof(buffer), 1);
  50                                 bufcnt = 0;
  51                         }
  52                 }
  53         }
  54 }
  55
  56 void CMT::put_signal()
  57 {
  58         if(rec && remote) {
  59                 uint32_t clock = get_passed_clock(prev_clock);
  60                 if(prev_signal == 1) {
  61                         // 2400Hz
  62                         int count = (int)(1200.0 * (double)clock / (double)CPU_CLOCKS + 0.5) * 2;
  63                         for(int i = 0; i < count; i++) {
  64                                 write_buffer(0xff, SAMPLE_RATE / 2400 / 2);
  65                                 write_buffer(0x00, SAMPLE_RATE / 2400 / 2);
  66                         }
  67                 } else if(prev_signal == -1) {
  68                         // 1200Hz
  69                         int count = (int)(1200.0 * (double)clock / (double)CPU_CLOCKS + 0.5);
  70                         for(int i = 0; i < count; i++) {
  71                                 write_buffer(0xff, SAMPLE_RATE / 1200 / 2);
  72                                 write_buffer(0x00, SAMPLE_RATE / 1200 / 2);
  73                         }
  74                 } else {
  75                         write_buffer(0x80, SAMPLE_RATE * clock / CPU_CLOCKS);
  76                 }
  77         }
  78 }
  79
  80 void CMT::write_signal(int id, uint32_t data, uint32_t mask)
  81 {
  82         bool next = ((data & mask) != 0);
  83
  84         if(id == SIG_CMT_REMOTE) {
  85                 if(!remote && next) {
  86                         // start
  87                         prev_signal = 0;
  88                         prev_clock = get_current_clock();
  89                 } else if(remote && !next) {
  90                         // stop
  91                         put_signal();
  92                 }
  93                 remote = next;
  94         } else if(id == SIG_CMT_SOD) {
  95                 if(remote) {
  96                         request_skip_frames();
  97                         put_signal();
  98                 }
  99                 prev_signal = next ? 1 : -1;
 100                 prev_clock = get_current_clock();
 101         }
 102 }
 103
 104 void CMT::rec_tape(const _TCHAR* file_path)
 105 {
 106         close_tape();
 107
 108         if(fio->Fopen(file_path, FILEIO_WRITE_BINARY)) {
 109                 my_tcscpy_s(rec_file_path, _MAX_PATH, file_path);
 110                 if(check_file_extension(file_path, _T(".wav"))) {
 111                         write_dummy_wav_header((void *)fio);
 112                         is_wav = true;
 113                 }
 114                 bufcnt = 0;
 115                 rec = true;
 116         }
 117 }
 118
 119 void CMT::close_tape()
 120 {
 121         // close file
 122         if(rec) {
 123                 if(bufcnt) {
 124                         fio->Fwrite(buffer, bufcnt, 1);
 125                 }
 126                 if(is_wav) {
 127                         uint32_t length = fio->Ftell();
 128                         wav_header_t wav_header;
 129                         wav_chunk_t wav_chunk;
 130 #if 0
 131
 132                         pair_t __riff_chunk_size;
 133                         pair_t __fmt_chunk_size;
 134                         pair_t __wav_chunk_size;
 135                         pair16_t __fmt_id;
 136                         pair16_t __channels;
 137                         pair_t __sample_rate;
 138                         pair16_t __block_size;
 139                         pair16_t __sample_bits;
 140
 141                         __riff_chunk_size.d = length - 8;
 142                         __fmt_chunk_size.d = 16;
 143                         __fmt_id.w = 1;
 144                         __channels.w = 1;
 145                         __sample_rate.d = SAMPLE_RATE;
 146                         __block_size.w = 1;
 147                         __sample_bits.w = 8;
 148
 149                         memcpy(wav_header.riff_chunk.id, "RIFF", 4);
 150                         wav_header.riff_chunk.size = __riff_chunk_size.get_4bytes_le_to();
 151
 152                         memcpy(wav_header.wave, "WAVE", 4);
 153                         memcpy(wav_header.fmt_chunk.id, "fmt ", 4);
 154                         wav_header.fmt_chunk.size = __riff_chunk_size.get_4bytes_le_to();
 155                         wav_header.format_id = __fmt_id.get_2bytes_le_to();
 156                         wav_header.channels = __channels.get_2byte_le_to();
 157                         wav_header.sample_rate = __sample_rate.get_4bytes_le_to();
 158                         wav_header.data_speed =  __sample_rate.get_4bytes_le_to();
 159                         wav_header.block_size = __block_size.get_2bytes_le_to();
 160                         wav_header.sample_bits = __sample_bits_get_2bytes_le_to();
 161
 162                         memcpy(wav_chunk.id, "data", 4);
 163                         __wav_chunk_size.d = length - sizeof(wav_header) - sizeof(wav_chunk);
 164                         wav_chunk.size = __wav_chunk_size.get_4bytes_le_to();
 165
 166
 167                         fio->Fseek(0, FILEIO_SEEK_SET);
 168                         fio->Fwrite(&wav_header, sizeof(wav_header), 1);
 169                         fio->Fwrite(&wav_chunk, sizeof(wav_chunk), 1);
 170 #else
 171                         if(set_wav_header(&wav_header, &wav_chunk, 1, SAMPLE_RATE, 8, length)) {
 172                                 fio->Fseek(0, FILEIO_SEEK_SET);
 173                                 fio->Fwrite(&wav_header, sizeof(wav_header), 1);
 174                                 fio->Fwrite(&wav_chunk, sizeof(wav_chunk), 1);
 175                         }
 176 #endif
 177                 }
 178                 fio->Fclose();
 179         }
 180         is_wav = rec = false;
 181 }
 182
 183 #define STATE_VERSION   1
 184
 185 bool CMT::process_state(FILEIO* state_fio, bool loading)
 186 {
 187         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 188                 return false;
 189         }
 190         if(!state_fio->StateCheckInt32(this_device_id)) {
 191                 return false;
 192         }
 193         state_fio->StateBool(is_wav);
 194         state_fio->StateBool(rec);
 195         state_fio->StateBool(remote);
 196         state_fio->StateBuffer(rec_file_path, sizeof(rec_file_path), 1);
 197         if(loading) {
 198                 int length_tmp = state_fio->FgetInt32_LE();
 199                 if(rec) {
 200                         fio->Fopen(rec_file_path, FILEIO_READ_WRITE_NEW_BINARY);
 201                         while(length_tmp != 0) {
 202                                 uint8_t buffer_tmp[1024];
 203                                 int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
 204                                 state_fio->Fread(buffer_tmp, length_rw, 1);
 205                                 if(fio->IsOpened()) {
 206                                         fio->Fwrite(buffer_tmp, length_rw, 1);
 207                                 }
 208                                 length_tmp -= length_rw;
 209                         }
 210                 }
 211         } else {
 212                 if(rec && fio->IsOpened()) {
 213                         int length_tmp = (int)fio->Ftell();
 214                         fio->Fseek(0, FILEIO_SEEK_SET);
 215                         state_fio->FputInt32_LE(length_tmp);
 216                         while(length_tmp != 0) {
 217                                 uint8_t buffer_tmp[1024];
 218                                 int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
 219                                 fio->Fread(buffer_tmp, length_rw, 1);
 220                                 state_fio->Fwrite(buffer_tmp, length_rw, 1);
 221                                 length_tmp -= length_rw;
 222                         }
 223                 } else {
 224                         state_fio->FputInt32_LE(0);
 225                 }
 226         }
 227         state_fio->StateInt32(bufcnt);
 228         state_fio->StateBuffer(buffer, sizeof(buffer), 1);
 229         state_fio->StateInt32(prev_signal);
 230         state_fio->StateUint32(prev_clock);
 231         return true;
 232 }