move to_timestamp, timestamp_to_sample to rcpp_whisper again in order…

… not to need common.cpp

src/Makevars

@@ -8,8 +8,8 @@ SOURCES = whisper_cpp/ggml/src/ggml-quants.c whisper_cpp/ggml/src/ggml-backend.c
 OBJECTS = whisper_cpp/ggml/src/ggml-quants.o whisper_cpp/ggml/src/ggml-backend.o whisper_cpp/ggml/src/ggml-alloc.o whisper_cpp/ggml/src/ggml-aarch64.o whisper_cpp/ggml/src/ggml.o 
 
 ## utils from examples
-SOURCES += whisper_cpp/examples/grammar-parser.cpp whisper_cpp/examples/common.cpp
-OBJECTS += whisper_cpp/examples/grammar-parser.o   whisper_cpp/examples/common.o
+SOURCES += whisper_cpp/examples/grammar-parser.cpp
+OBJECTS += whisper_cpp/examples/grammar-parser.o  
 
 ## whisper source code + R wrapper
 SOURCES += whisper_cpp/src/whisper.cpp rcpp_whisper_utils.cpp rcpp_whisper.cpp RcppExports.cpp

src/rcpp_whisper.cpp

@@ -16,6 +16,27 @@
 #pragma warning(disable: 4244 4267) // possible loss of data
 #endif
 
+//  500 -> 00:05.000
+// 6000 -> 01:00.000
+std::string to_timestamp(int64_t t, bool comma) {
+  int64_t msec = t * 10;
+  int64_t hr = msec / (1000 * 60 * 60);
+  msec = msec - hr * (1000 * 60 * 60);
+  int64_t min = msec / (1000 * 60);
+  msec = msec - min * (1000 * 60);
+  int64_t sec = msec / 1000;
+  msec = msec - sec * 1000;
+
+  char buf[32];
+  snprintf(buf, sizeof(buf), "%02d:%02d:%02d%s%03d", (int) hr, (int) min, (int) sec, comma ? "," : ".", (int) msec);
+
+  return std::string(buf);
+}
+
+int timestamp_to_sample(int64_t t, int n_samples, int whisper_sample_rate) {
+  return std::max(0, std::min((int) n_samples - 1, (int) ((t*whisper_sample_rate)/100)));
+}
+
 // command-line parameters
 struct whisper_params {
   int32_t n_threads     = std::min(4, (int32_t) std::thread::hardware_concurrency());