2 NEC PC-8201 Emulator 'ePC-8201'
4 Author : Takeda.Toshiya
12 #define SAMPLE_RATE 48000
16 void CMT::initialize()
34 void CMT::write_buffer(uint8_t value, int samples)
37 for(int i = 0; i < samples; i++) {
38 buffer[bufcnt++] = value;
39 if(bufcnt == sizeof(buffer)) {
40 fio->Fwrite(buffer, sizeof(buffer), 1);
45 value = (value > 128) ? 0x80 : 0;
47 int s = min(samples, 0x7f);
49 buffer[bufcnt++] = value | s;
50 if(bufcnt == sizeof(buffer)) {
51 fio->Fwrite(buffer, sizeof(buffer), 1);
58 void CMT::put_signal()
61 uint32_t clock = get_passed_clock(prev_clock);
62 if(prev_signal == 1) {
64 int count = (int)(1200.0 * (double)clock / (double)CPU_CLOCKS + 0.5) * 2;
65 for(int i = 0; i < count; i++) {
66 write_buffer(0xff, SAMPLE_RATE / 2400 / 2);
67 write_buffer(0x00, SAMPLE_RATE / 2400 / 2);
69 } else if(prev_signal == -1) {
71 int count = (int)(1200.0 * (double)clock / (double)CPU_CLOCKS + 0.5);
72 for(int i = 0; i < count; i++) {
73 write_buffer(0xff, SAMPLE_RATE / 1200 / 2);
74 write_buffer(0x00, SAMPLE_RATE / 1200 / 2);
77 write_buffer(0x80, SAMPLE_RATE * clock / CPU_CLOCKS);
82 void CMT::write_signal(int id, uint32_t data, uint32_t mask)
84 bool next = ((data & mask) != 0);
86 if(id == SIG_CMT_REMOTE) {
90 prev_clock = get_current_clock();
91 } else if(remote && !next) {
96 } else if(id == SIG_CMT_SOD) {
98 request_skip_frames();
101 prev_signal = next ? 1 : -1;
102 prev_clock = get_current_clock();
106 void CMT::rec_tape(const _TCHAR* file_path)
110 if(fio->Fopen(file_path, FILEIO_WRITE_BINARY)) {
111 my_tcscpy_s(rec_file_path, _MAX_PATH, file_path);
112 if(check_file_extension(file_path, _T(".wav"))) {
113 write_dummy_wav_header((void *)fio);
121 void CMT::close_tape()
126 fio->Fwrite(buffer, bufcnt, 1);
129 uint32_t length = fio->Ftell();
130 wav_header_t wav_header;
131 wav_chunk_t wav_chunk;
134 pair_t __riff_chunk_size;
135 pair_t __fmt_chunk_size;
136 pair_t __wav_chunk_size;
139 pair_t __sample_rate;
140 pair16_t __block_size;
141 pair16_t __sample_bits;
143 __riff_chunk_size.d = length - 8;
144 __fmt_chunk_size.d = 16;
147 __sample_rate.d = SAMPLE_RATE;
151 memcpy(wav_header.riff_chunk.id, "RIFF", 4);
152 wav_header.riff_chunk.size = __riff_chunk_size.get_4bytes_le_to();
154 memcpy(wav_header.wave, "WAVE", 4);
155 memcpy(wav_header.fmt_chunk.id, "fmt ", 4);
156 wav_header.fmt_chunk.size = __riff_chunk_size.get_4bytes_le_to();
157 wav_header.format_id = __fmt_id.get_2bytes_le_to();
158 wav_header.channels = __channels.get_2byte_le_to();
159 wav_header.sample_rate = __sample_rate.get_4bytes_le_to();
160 wav_header.data_speed = __sample_rate.get_4bytes_le_to();
161 wav_header.block_size = __block_size.get_2bytes_le_to();
162 wav_header.sample_bits = __sample_bits_get_2bytes_le_to();
164 memcpy(wav_chunk.id, "data", 4);
165 __wav_chunk_size.d = length - sizeof(wav_header) - sizeof(wav_chunk);
166 wav_chunk.size = __wav_chunk_size.get_4bytes_le_to();
169 fio->Fseek(0, FILEIO_SEEK_SET);
170 fio->Fwrite(&wav_header, sizeof(wav_header), 1);
171 fio->Fwrite(&wav_chunk, sizeof(wav_chunk), 1);
173 if(set_wav_header(&wav_header, &wav_chunk, 1, SAMPLE_RATE, 8, length)) {
174 fio->Fseek(0, FILEIO_SEEK_SET);
175 fio->Fwrite(&wav_header, sizeof(wav_header), 1);
176 fio->Fwrite(&wav_chunk, sizeof(wav_chunk), 1);
182 is_wav = rec = false;
185 #define STATE_VERSION 1
187 bool CMT::process_state(FILEIO* state_fio, bool loading)
189 if(!state_fio->StateCheckUint32(STATE_VERSION)) {
192 if(!state_fio->StateCheckInt32(this_device_id)) {
195 state_fio->StateBool(is_wav);
196 state_fio->StateBool(rec);
197 state_fio->StateBool(remote);
198 state_fio->StateBuffer(rec_file_path, sizeof(rec_file_path), 1);
200 int length_tmp = state_fio->FgetInt32_LE();
202 fio->Fopen(rec_file_path, FILEIO_READ_WRITE_NEW_BINARY);
203 while(length_tmp != 0) {
204 uint8_t buffer_tmp[1024];
205 int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
206 state_fio->Fread(buffer_tmp, length_rw, 1);
207 if(fio->IsOpened()) {
208 fio->Fwrite(buffer_tmp, length_rw, 1);
210 length_tmp -= length_rw;
214 if(rec && fio->IsOpened()) {
215 int length_tmp = (int)fio->Ftell();
216 fio->Fseek(0, FILEIO_SEEK_SET);
217 state_fio->FputInt32_LE(length_tmp);
218 while(length_tmp != 0) {
219 uint8_t buffer_tmp[1024];
220 int length_rw = min(length_tmp, (int)sizeof(buffer_tmp));
221 fio->Fread(buffer_tmp, length_rw, 1);
222 state_fio->Fwrite(buffer_tmp, length_rw, 1);
223 length_tmp -= length_rw;
226 state_fio->FputInt32_LE(0);
229 state_fio->StateInt32(bufcnt);
230 state_fio->StateBuffer(buffer, sizeof(buffer), 1);
231 state_fio->StateInt32(prev_signal);
232 state_fio->StateUint32(prev_clock);