Support writing generated audio samples to wave files (#363)

sherpa-onnx/csrc/sherpa-onnx-offline-tts.cc

@@ -6,6 +6,7 @@
 
 #include "sherpa-onnx/csrc/offline-tts.h"
 #include "sherpa-onnx/csrc/parse-options.h"
+#include "sherpa-onnx/csrc/wave-writer.h"
 
 int main(int32_t argc, char *argv[]) {
   const char *kUsageMessage = R"usage(
@@ -15,13 +16,34 @@ Offline text-to-speech with sherpa-onnx
  --vits-model /path/to/model.onnx \
  --vits-lexicon /path/to/lexicon.txt \
  --vits-tokens /path/to/tokens.txt
+ --output-filename ./generated.wav \
  'some text within single quotes'
 
-It will generate a file test.wav.
+It will generate a file ./generated.wav as specified by --output-filename.
+
+You can download a test model from
+https://huggingface.co/csukuangfj/vits-ljs
+
+For instance, you can use:
+wget https://huggingface.co/csukuangfj/vits-ljs/resolve/main/vits-ljs.onnx
+wget https://huggingface.co/csukuangfj/vits-ljs/resolve/main/lexicon.txt
+wget https://huggingface.co/csukuangfj/vits-ljs/resolve/main/tokens.txt
+
+./bin/sherpa-onnx-offline-tts \
+  --vits-model=./vits-ljs.onnx \
+  --vits-lexicon=./lexicon.txt \
+  --vits-tokens=./tokens.txt \
+  --output-filename=./generated.wav \
+  'liliana, the most beautiful and lovely assistant of our team!'
 )usage";
 
   sherpa_onnx::ParseOptions po(kUsageMessage);
+  std::string output_filename = "./generated.wav";
+  po.Register("output-filename", &output_filename,
+              "Path to save the generated audio");
+
   sherpa_onnx::OfflineTtsConfig config;
+
   config.Register(&po);
   po.Read(argc, argv);
 
@@ -47,11 +69,15 @@ It will generate a file test.wav.
   sherpa_onnx::OfflineTts tts(config);
   auto audio = tts.Generate(po.GetArg(1));
 
-  std::ofstream os("t.pcm", std::ios::binary);
-  os.write(reinterpret_cast<const char *>(audio.samples.data()),
-           sizeof(float) * audio.samples.size());
+  bool ok = sherpa_onnx::WriteWave(output_filename, audio.sample_rate,
+                                   audio.samples.data(), audio.samples.size());
+  if (!ok) {
+    fprintf(stderr, "Failed to write wave to %s\n", output_filename.c_str());
+    exit(EXIT_FAILURE);
+  }
 
-  // sox -t raw -r 22050 -b 32 -e floating-point -c 1 ./t.pcm ./t.wav
+  fprintf(stderr, "The text is: %s\n", po.GetArg(1).c_str());
+  fprintf(stderr, "Saved to %s successfully!\n", output_filename.c_str());
 
   return 0;
 }