X-Git-Url: https://git.sesse.net/?p=c64tapwav;a=blobdiff_plain;f=decode.cpp;h=49be647ea2cc67442718f2765e66ff508cd91064;hp=1a5ee74856c5c635e37ea434213307114964be6c;hb=866751f2909657ee7d62f936e3d2cb2ecb7806fb;hpb=eb5c6ac462d461ce3929e9a82fdd5f33aa537923

diff --git a/decode.cpp b/decode.cpp
index 1a5ee74..49be647 100644
--- a/decode.cpp
+++ b/decode.cpp
@@ -1,31 +1,24 @@
 #include <stdio.h>
 #include <string.h>
 #include <math.h>
-#include <unistd.h>
 #include <assert.h>
+#include <limits.h>
 #include <vector>
 #include <algorithm>
 
 #include "interpolate.h"
+#include "tap.h"
 
 #define BUFSIZE 4096
 #define HYSTERESIS_LIMIT 3000
 #define SAMPLE_RATE 44100
 #define C64_FREQUENCY 985248
-#define TAP_RESOLUTION 8
 
 #define SYNC_PULSE_START 1000
 #define SYNC_PULSE_END 15000
 #define SYNC_PULSE_LENGTH 378.0
 #define SYNC_TEST_TOLERANCE 1.10
 
-struct tap_header {
-	char identifier[12];
-	char version;
-	char reserved[3];
-	unsigned int data_len;
-};
-
 // between [x,x+1]
 double find_zerocrossing(const std::vector<short> &pcm, int x)
 {
@@ -41,7 +34,7 @@ double find_zerocrossing(const std::vector<short> &pcm, int x)
 
 	double upper = x;
 	double lower = x + 1;
-	while (upper - lower > 1e-6) {
+	while (lower - upper > 1e-3) {
 		double mid = 0.5f * (upper + lower);
 		if (lanczos_interpolate(pcm, mid) > 0) {
 			upper = mid;
@@ -60,6 +53,7 @@ struct pulse {
 	
 int main(int argc, char **argv)
 {
+	make_lanczos_weight_table();
 	std::vector<short> pcm;
 
 	while (!feof(stdin)) {
@@ -189,4 +183,20 @@ int main(int argc, char **argv)
 
 	fwrite(&hdr, sizeof(hdr), 1, stdout);
 	fwrite(tap_data.data(), tap_data.size(), 1, stdout);
+
+	// Output a debug raw file with pulse detection points.
+	fp = fopen("debug.raw", "wb");
+	short one = 32767;
+	short zero = 0;
+	unsigned pulsenum = 0;
+	for (unsigned i = 0; i < pcm.size(); ++i) {
+		unsigned next_pulse = (pulsenum >= pulses.size()) ? INT_MAX : int(pulses[pulsenum].time * SAMPLE_RATE);
+		if (i >= next_pulse) {
+			fwrite(&one, sizeof(one), 1, fp);
+			++pulsenum;
+		} else {
+			fwrite(&zero, sizeof(zero), 1, fp);
+		}
+	}
+	fclose(fp);
 }