common : separate whisper sources (#2846)

* common : separate whisper sources

* examples : add chrono

* examples : add more headers

examples/common-whisper.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include <cstdint>
+
+// Read WAV audio file and store the PCM data into pcmf32
+// fname can be a buffer of WAV data instead of a filename
+// The sample rate of the audio must be equal to COMMON_SAMPLE_RATE
+// If stereo flag is set and the audio has 2 channels, the pcmf32s will contain 2 channel PCM
+bool read_audio_data(
+        const std::string & fname,
+        std::vector<float> & pcmf32,
+        std::vector<std::vector<float>> & pcmf32s,
+        bool stereo);
+
+// convert timestamp to string, 6000 -> 01:00.000
+std::string to_timestamp(int64_t t, bool comma = false);
+
+// given a timestamp get the sample
+int timestamp_to_sample(int64_t t, int n_samples, int whisper_sample_rate);
+
+// write text to file, and call system("command voice_id file")
+bool speak_with_file(const std::string & command, const std::string & text, const std::string & path, int voice_id);