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 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 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 data, uint32 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                         uint8 dummy[sizeof(wav_header_t) + sizeof(wav_chunk_t)];
 112                         memset(dummy, 0, sizeof(dummy));
 113                         fio->Fwrite(dummy, sizeof(dummy), 1);
 114                         is_wav = true;
 115                 }
 116                 bufcnt = 0;
 117                 rec = true;
 118         }
 119 }
 120
 121 void CMT::close_tape()
 122 {
 123         // close file
 124         if(rec) {
 125                 if(bufcnt) {
 126                         fio->Fwrite(buffer, bufcnt, 1);
 127                 }
 128                 if(is_wav) {
 129                         uint32 length = fio->Ftell();
 130
 131                         wav_header_t wav_header;
 132                         wav_chunk_t wav_chunk;
 133
 134                         memcpy(wav_header.riff_chunk.id, "RIFF", 4);
 135                         wav_header.riff_chunk.size = length - 8;
 136                         memcpy(wav_header.wave, "WAVE", 4);
 137                         memcpy(wav_header.fmt_chunk.id, "fmt ", 4);
 138                         wav_header.fmt_chunk.size = 16;
 139                         wav_header.format_id = 1;
 140                         wav_header.channels = 1;
 141                         wav_header.sample_rate = SAMPLE_RATE;
 142                         wav_header.data_speed = SAMPLE_RATE;
 143                         wav_header.block_size = 1;
 144                         wav_header.sample_bits = 8;
 145
 146                         memcpy(wav_chunk.id, "data", 4);
 147                         wav_chunk.size = length - sizeof(wav_header) - sizeof(wav_chunk);
 148
 149                         fio->Fseek(0, FILEIO_SEEK_SET);
 150                         fio->Fwrite(&wav_header, sizeof(wav_header), 1);
 151                         fio->Fwrite(&wav_chunk, sizeof(wav_chunk), 1);
 152                 }
 153                 fio->Fclose();
 154         }
 155         is_wav = rec = false;
 156 }
 157
 158 #define STATE_VERSION   1
 159
 160 void CMT::save_state(FILEIO* state_fio)
 161 {
 162         state_fio->FputUint32(STATE_VERSION);
 163         state_fio->FputInt32(this_device_id);
 164
 165         state_fio->FputBool(is_wav);
 166         state_fio->FputBool(rec);
 167         state_fio->FputBool(remote);
 168         state_fio->Fwrite(rec_file_path, sizeof(rec_file_path), 1);
 169         if(rec && fio->IsOpened()) {
 170                 int length_tmp = (int)fio->Ftell();
 171                 fio->Fseek(0, FILEIO_SEEK_SET);
 172                 state_fio->FputInt32(length_tmp);
 173                 while(length_tmp != 0) {
 174                         uint8 buffer_tmp[1024];
 175                         int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
 176                         fio->Fread(buffer_tmp, length_rw, 1);
 177                         state_fio->Fwrite(buffer_tmp, length_rw, 1);
 178                         length_tmp -= length_rw;
 179                 }
 180         } else {
 181                 state_fio->FputInt32(0);
 182         }
 183         state_fio->FputInt32(bufcnt);
 184         state_fio->Fwrite(buffer, sizeof(buffer), 1);
 185         state_fio->FputInt32(prev_signal);
 186         state_fio->FputUint32(prev_clock);
 187 }
 188
 189 bool CMT::load_state(FILEIO* state_fio)
 190 {
 191         close_tape();
 192
 193         if(state_fio->FgetUint32() != STATE_VERSION) {
 194                 return false;
 195         }
 196         if(state_fio->FgetInt32() != this_device_id) {
 197                 return false;
 198         }
 199         is_wav = state_fio->FgetBool();
 200         rec = state_fio->FgetBool();
 201         remote = state_fio->FgetBool();
 202         state_fio->Fread(rec_file_path, sizeof(rec_file_path), 1);
 203         int length_tmp = state_fio->FgetInt32();
 204         if(rec) {
 205                 fio->Fopen(rec_file_path, FILEIO_READ_WRITE_NEW_BINARY);
 206                 while(length_tmp != 0) {
 207                         uint8 buffer_tmp[1024];
 208                         int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
 209                         state_fio->Fread(buffer_tmp, length_rw, 1);
 210                         if(fio->IsOpened()) {
 211                                 fio->Fwrite(buffer_tmp, length_rw, 1);
 212                         }
 213                         length_tmp -= length_rw;
 214                 }
 215         }
 216         bufcnt = state_fio->FgetInt32();
 217         state_fio->Fread(buffer, sizeof(buffer), 1);
 218         prev_signal = state_fio->FgetInt32();
 219         prev_clock = state_fio->FgetUint32();
 220         return true;
 221 }
 222