2 NEC PC-8201 Emulator 'ePC-8201'
4 Author : Takeda.Toshiya
12 #define SAMPLE_RATE 48000
14 void CMT::initialize()
32 void CMT::write_buffer(uint8_t value, int samples)
35 for(int i = 0; i < samples; i++) {
36 buffer[bufcnt++] = value;
37 if(bufcnt == sizeof(buffer)) {
38 fio->Fwrite(buffer, sizeof(buffer), 1);
43 value = (value > 128) ? 0x80 : 0;
45 int s = min(samples, 0x7f);
47 buffer[bufcnt++] = value | s;
48 if(bufcnt == sizeof(buffer)) {
49 fio->Fwrite(buffer, sizeof(buffer), 1);
56 void CMT::put_signal()
59 uint32_t clock = get_passed_clock(prev_clock);
60 if(prev_signal == 1) {
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);
67 } else if(prev_signal == -1) {
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);
75 write_buffer(0x80, SAMPLE_RATE * clock / CPU_CLOCKS);
80 void CMT::write_signal(int id, uint32_t data, uint32_t mask)
82 bool next = ((data & mask) != 0);
84 if(id == SIG_CMT_REMOTE) {
88 prev_clock = get_current_clock();
89 } else if(remote && !next) {
94 } else if(id == SIG_CMT_SOD) {
96 request_skip_frames();
99 prev_signal = next ? 1 : -1;
100 prev_clock = get_current_clock();
104 void CMT::rec_tape(const _TCHAR* file_path)
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_t dummy[sizeof(wav_header_t) + sizeof(wav_chunk_t)];
112 memset(dummy, 0, sizeof(dummy));
113 fio->Fwrite(dummy, sizeof(dummy), 1);
121 void CMT::close_tape()
126 fio->Fwrite(buffer, bufcnt, 1);
129 uint32_t length = fio->Ftell();
131 wav_header_t wav_header;
132 wav_chunk_t wav_chunk;
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;
146 memcpy(wav_chunk.id, "data", 4);
147 wav_chunk.size = length - sizeof(wav_header) - sizeof(wav_chunk);
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);
155 is_wav = rec = false;
158 #define STATE_VERSION 1
160 void CMT::save_state(FILEIO* state_fio)
162 state_fio->FputUint32(STATE_VERSION);
163 state_fio->FputInt32(this_device_id);
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_t 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;
181 state_fio->FputInt32(0);
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);
189 bool CMT::load_state(FILEIO* state_fio)
193 if(state_fio->FgetUint32() != STATE_VERSION) {
196 if(state_fio->FgetInt32() != this_device_id) {
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();
205 fio->Fopen(rec_file_path, FILEIO_READ_WRITE_NEW_BINARY);
206 while(length_tmp != 0) {
207 uint8_t 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);
213 length_tmp -= length_rw;
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();