Examples: Add save audio to file option in stream.cpp (ggerganov#1310)

* save the recorded audio to a file

* Alignment -help

* Save the correct audio

* chage to a consistent coding style

* Correct typo

* Update examples/stream/stream.cpp

* Update examples/stream/stream.cpp

* Correct variable misuse

* Update examples/stream/stream.cpp

* Update examples/stream/stream.cpp

* Update examples/stream/stream.cpp

* Update examples/stream/stream.cpp

---------

Co-authored-by: bobqianic <129547291+bobqianic@users.noreply.github.com>

examples/stream/stream.cpp

@@ -2,7 +2,7 @@
 //
 // A very quick-n-dirty implementation serving mainly as a proof of concept.
 //
-
+#include <fstream>
 #include "common-sdl.h"
 #include "common.h"
 #include "whisper.h"
@@ -13,7 +13,60 @@
 #include <thread>
 #include <vector>
 #include <fstream>
+#include <ctime>
+
+class SimpleWavWriter {
+private:
+ std::ofstream file;
+ int32_t dataSize = 0;
+
+public:
+ SimpleWavWriter(const std::string &filename, int sampleRate, int bitsPerSample, int channels) {
+ file.open(filename, std::ios::binary);
+
+ file.write("RIFF", 4);
+ file.write("\0\0\0\0", 4); // Placeholder for file size
+ file.write("WAVE", 4);
+ file.write("fmt ", 4);
+
+ int32_t subChunkSize = 16;
+ int16_t audioFormat = 1; // PCM format
+ int32_t byteRate = sampleRate * channels * bitsPerSample / 8;
+ int16_t blockAlign = channels * bitsPerSample / 8;
+
+ file.write(reinterpret_cast<char *>(&subChunkSize), 4);
+ file.write(reinterpret_cast<char *>(&audioFormat), 2);
+ file.write(reinterpret_cast<char *>(&channels), 2);
+ file.write(reinterpret_cast<char *>(&sampleRate), 4);
+ file.write(reinterpret_cast<char *>(&byteRate), 4);
+ file.write(reinterpret_cast<char *>(&blockAlign), 2);
+ file.write(reinterpret_cast<char *>(&bitsPerSample), 2);
+ file.write("data", 4);
+ file.write("\0\0\0\0", 4); // Placeholder for data size
+ }
+
+ void writeData(const float *data, size_t length) {
+ for (size_t i = 0; i < length; ++i) {
+ int16_t intSample = static_cast<int16_t>(data[i] * 32767);
+ file.write(reinterpret_cast<char *>(&intSample), sizeof(int16_t));
+ dataSize += sizeof(int16_t);
+ }
+ if (file.is_open()) {
+ file.seekp(4, std::ios::beg);
+ int32_t fileSize = 36 + dataSize;
+ file.write(reinterpret_cast<char *>(&fileSize), 4);
+ file.seekp(40, std::ios::beg);
+ file.write(reinterpret_cast<char *>(&dataSize), 4);
+ file.seekp(0, std::ios::end);
+ }
+ }
 
+ ~SimpleWavWriter() {
+ if (file.is_open()) {
+ file.close();
+ }
+ }
+};
 // 500 -> 00:05.000
 // 6000 -> 01:00.000
 std::string to_timestamp(int64_t t) {
@@ -52,6 +105,7 @@ struct whisper_params {
  std::string language = "en";
  std::string model = "models/ggml-base.en.bin";
  std::string fname_out;
+ bool save_audio = false; // save audio to wav file
 };
 
 void whisper_print_usage(int argc, char ** argv, const whisper_params & params);
@@ -82,6 +136,7 @@ bool whisper_params_parse(int argc, char ** argv, whisper_params & params) {
  else if (arg == "-m" || arg == "--model") { params.model = argv[++i]; }
  else if (arg == "-f" || arg == "--file") { params.fname_out = argv[++i]; }
  else if (arg == "-tdrz" || arg == "--tinydiarize") { params.tinydiarize = true; }
+ else if (arg == "-sa" || arg == "--save-audio") { params.save_audio = true; }
 
  else {
  fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
@@ -117,6 +172,7 @@ void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & para
  fprintf(stderr, " -m FNAME, --model FNAME [%-7s] model path\n", params.model.c_str());
  fprintf(stderr, " -f FNAME, --file FNAME [%-7s] text output file name\n", params.fname_out.c_str());
  fprintf(stderr, " -tdrz, --tinydiarize [%-7s] enable tinydiarize (requires a tdrz model)\n", params.tinydiarize ? "true" : "false");
+ fprintf(stderr, " -sa, --save-audio [%-7s] save the recorded audio to a file\n", params.save_audio ? "true" : "false");
  fprintf(stderr, "\n");
 }
 
@@ -154,7 +210,6 @@ int main(int argc, char ** argv) {
  audio.resume();
 
  // whisper init
-
  if (params.language != "auto" && whisper_lang_id(params.language.c_str()) == -1){
  fprintf(stderr, "error: unknown language '%s'\n", params.language.c_str());
  whisper_print_usage(argc, argv, params);
@@ -211,15 +266,28 @@ int main(int argc, char ** argv) {
  return 1;
  }
  }
-
- printf("[Start speaking]");
+ // save wav file
+ SimpleWavWriter *wavWriter = nullptr;
+ if (params.save_audio) {
+ // Get current date/time for filename
+ time_t now = time(0);
+ char buffer[80];
+ strftime(buffer, sizeof(buffer), "%Y%m%d%H%M%S", localtime(&now));
+ std::string filename = std::string(buffer) + ".wav";
+
+ wavWriter = new SimpleWavWriter(filename, WHISPER_SAMPLE_RATE, 16, 1);
+ }
+ printf("[Start speaking]\n");
  fflush(stdout);
 
-  auto t_last = std::chrono::high_resolution_clock::now();
+ auto t_last = std::chrono::high_resolution_clock::now();
  const auto t_start = t_last;
 
  // main audio loop
  while (is_running) {
+ if (params.save_audio && wavWriter) {
+ wavWriter->writeData(pcmf32_new.data(), pcmf32_new.size());
+ }
  // handle Ctrl + C
  is_running = sdl_poll_events();
 
@@ -371,7 +439,7 @@ int main(int argc, char ** argv) {
  fout << std::endl;
  }
 
- if (use_vad){
+ if (use_vad) {
  printf("\n");
  printf("### Transcription %d END\n", n_iter);
  }
@@ -408,4 +476,4 @@ int main(int argc, char ** argv) {
  whisper_free(ctx);
 
  return 0;
-}
+}