snapshot of https://github.com/ggml-org/whisper.cpp.git @ da54572229bcf64ba367d96c7ef15770376c4280 (2026-09-15)

bindings/javascript/emscripten.cpp

@@ -0,0 +1,93 @@
+//
+// This is the Javascript API of whisper.cpp
+//
+// Very crude at the moment.
+// Feel free to contribute and make this better!
+//
+// See the tests/test-whisper.js for sample usage
+//
+
+#include "whisper.h"
+
+#include <emscripten.h>
+#include <emscripten/bind.h>
+
+#include <thread>
+#include <vector>
+
+struct whisper_context * g_context;
+
+EMSCRIPTEN_BINDINGS(whisper) {
+    emscripten::function("init", emscripten::optional_override([](const std::string & path_model) {
+        if (g_context == nullptr) {
+            g_context = whisper_init_from_file_with_params(path_model.c_str(), whisper_context_default_params());
+            if (g_context != nullptr) {
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        return false;
+    }));
+
+    emscripten::function("free", emscripten::optional_override([]() {
+        if (g_context) {
+            whisper_free(g_context);
+            g_context = nullptr;
+        }
+    }));
+
+    emscripten::function("full_default", emscripten::optional_override([](const emscripten::val & audio, const std::string & lang, bool translate) {
+        if (g_context == nullptr) {
+            return -1;
+        }
+
+        struct whisper_full_params params = whisper_full_default_params(whisper_sampling_strategy::WHISPER_SAMPLING_GREEDY);
+
+        params.print_realtime   = true;
+        params.print_progress   = false;
+        params.print_timestamps = true;
+        params.print_special    = false;
+        params.translate        = translate;
+        params.language         = whisper_is_multilingual(g_context) ? lang.c_str() : "en";
+        params.n_threads        = std::min(8, (int) std::thread::hardware_concurrency());
+        params.offset_ms        = 0;
+
+        std::vector<float> pcmf32;
+        const int n = audio["length"].as<int>();
+
+        emscripten::val heap = emscripten::val::module_property("HEAPU8");
+        emscripten::val memory = heap["buffer"];
+
+        pcmf32.resize(n);
+
+        emscripten::val memoryView = audio["constructor"].new_(memory, reinterpret_cast<uintptr_t>(pcmf32.data()), n);
+        memoryView.call<void>("set", audio);
+
+        // print system information
+        {
+            printf("\n");
+            printf("system_info: n_threads = %d / %d | %s\n",
+                    params.n_threads, std::thread::hardware_concurrency(), whisper_print_system_info());
+
+            printf("\n");
+            printf("%s: processing %d samples, %.1f sec, %d threads, %d processors, lang = %s, task = %s ...\n",
+                    __func__, int(pcmf32.size()), float(pcmf32.size())/WHISPER_SAMPLE_RATE,
+                    params.n_threads, 1,
+                    params.language,
+                    params.translate ? "translate" : "transcribe");
+
+            printf("\n");
+        }
+
+        // run whisper
+        {
+            whisper_reset_timings(g_context);
+            whisper_full(g_context, params, pcmf32.data(), pcmf32.size());
+            whisper_print_timings(g_context);
+        }
+
+        return 0;
+    }));
+}