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# whisper.cpp
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Node.js package for Whisper speech recognition
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Package: https://www.npmjs.com/package/whisper.cpp
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## Details
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The performance is comparable to when running `whisper.cpp` in the browser via WASM.
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The API is currently very rudimentary: [bindings/javascript/emscripten.cpp](/bindings/javascript/emscripten.cpp)
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For sample usage check [tests/test-whisper.js](/tests/test-whisper.js)
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## Package building + test
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```bash
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# load emscripten
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source /path/to/emsdk/emsdk_env.sh
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# clone repo
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git clone https://github.com/ggerganov/whisper.cpp
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cd whisper.cpp
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# grab base.en model
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./models/download-ggml-model.sh base.en
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# prepare PCM sample for testing
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ffmpeg -i samples/jfk.wav -f f32le -acodec pcm_f32le samples/jfk.pcmf32
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# build
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mkdir build-em && cd build-em
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emcmake cmake .. && make -j
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# run test
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node --experimental-wasm-threads --experimental-wasm-simd ../tests/test-whisper.js
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# publish npm package
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make publish-npm
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```
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## Sample run
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```java
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$ node --experimental-wasm-threads --experimental-wasm-simd ../tests/test-whisper.js
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whisper_model_load: loading model from 'whisper.bin'
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whisper_model_load: n_vocab = 51864
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whisper_model_load: n_audio_ctx = 1500
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whisper_model_load: n_audio_state = 512
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whisper_model_load: n_audio_head = 8
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whisper_model_load: n_audio_layer = 6
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whisper_model_load: n_text_ctx = 448
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whisper_model_load: n_text_state = 512
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whisper_model_load: n_text_head = 8
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whisper_model_load: n_text_layer = 6
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whisper_model_load: n_mels = 80
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whisper_model_load: f16 = 1
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whisper_model_load: type = 2
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whisper_model_load: adding 1607 extra tokens
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whisper_model_load: mem_required = 506.00 MB
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whisper_model_load: ggml ctx size = 140.60 MB
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whisper_model_load: memory size = 22.83 MB
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whisper_model_load: model size = 140.54 MB
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system_info: n_threads = 8 / 10 | AVX = 0 | AVX2 = 0 | AVX512 = 0 | NEON = 0 | F16C = 0 | FP16_VA = 0 | WASM_SIMD = 1 | BLAS = 0 |
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operator(): processing 176000 samples, 11.0 sec, 8 threads, 1 processors, lang = en, task = transcribe ...
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[00:00:00.000 --> 00:00:11.000] And so my fellow Americans, ask not what your country can do for you, ask what you can do for your country.
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whisper_print_timings: load time = 162.37 ms
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whisper_print_timings: mel time = 183.70 ms
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whisper_print_timings: sample time = 4.27 ms
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whisper_print_timings: encode time = 8582.63 ms / 1430.44 ms per layer
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whisper_print_timings: decode time = 436.16 ms / 72.69 ms per layer
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whisper_print_timings: total time = 9370.90 ms
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```
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