+
+void output_tap(const std::vector<pulse>& pulses, double calibration_factor)
+{
+ std::vector<char> tap_data;
+ for (unsigned i = 0; i < pulses.size(); ++i) {
+ double cycles = pulses[i].len * calibration_factor * C64_FREQUENCY;
+ int len = lrintf(cycles / TAP_RESOLUTION);
+ if (i > SYNC_PULSE_END && (cycles < 100 || cycles > 800)) {
+ fprintf(stderr, "Cycle with downflank at %.6f was detected at %.0f cycles; misdetect?\n",
+ pulses[i].time, cycles);
+ }
+ if (len <= 255) {
+ tap_data.push_back(len);
+ } else {
+ int overflow_len = lrintf(cycles);
+ tap_data.push_back(0);
+ tap_data.push_back(overflow_len & 0xff);
+ tap_data.push_back((overflow_len >> 8) & 0xff);
+ tap_data.push_back(overflow_len >> 16);
+ }
+ }
+
+ tap_header hdr;
+ memcpy(hdr.identifier, "C64-TAPE-RAW", 12);
+ hdr.version = 1;
+ hdr.reserved[0] = hdr.reserved[1] = hdr.reserved[2] = 0;
+ hdr.data_len = tap_data.size();
+
+ fwrite(&hdr, sizeof(hdr), 1, stdout);
+ fwrite(tap_data.data(), tap_data.size(), 1, stdout);
+}