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stream.wasm : add language selection support (#3354)

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* stream.wasm : add language selection support

This commit adds support for selecting the language in the stream.wasm
example. This is includes adding the model `base` which supports
multilingual transcription, and allowing the user to select a language
from a dropdown menu in the HTML interface.

The motivation for this is that it allows users to transcribe audio in
various languages.

Refs: https://github.com/ggml-org/whisper.cpp/issues/3347

* squash! stream.wasm : add language selection support

Remove strdup() for language in stream.wasm and update butten text for
base (should not be "base.en" but just "base").
This commit is contained in:
Daniel Bevenius
2025-08-02 07:03:04 +02:00
committed by GitHub
parent f7502dca87
commit 0becabc8d6
2 changed files with 83 additions and 7 deletions
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examples/stream.wasm/emscripten.cpp
+6 -6
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@@ -31,10 +31,11 @@ void stream_set_status(const std::string & status) {
g_status = status;
}
void stream_main(size_t index) {
void stream_main(size_t index, const std::string & lang) {
stream_set_status("loading data ...");
struct whisper_full_params wparams = whisper_full_default_params(whisper_sampling_strategy::WHISPER_SAMPLING_GREEDY);
bool is_multilingual = whisper_is_multilingual(g_contexts[index]);
wparams.n_threads = std::min(N_THREAD, (int) std::thread::hardware_concurrency());
wparams.offset_ms = 0;
@@ -52,7 +53,7 @@ void stream_main(size_t index) {
// disable temperature fallback
wparams.temperature_inc = -1.0f;
wparams.language = "en";
wparams.language = is_multilingual ? lang.c_str() : "en";
printf("stream: using %d threads\n", wparams.n_threads);
@@ -127,9 +128,8 @@ void stream_main(size_t index) {
g_contexts[index] = nullptr;
}
}
EMSCRIPTEN_BINDINGS(stream) {
emscripten::function("init", emscripten::optional_override([](const std::string & path_model) {
emscripten::function("init", emscripten::optional_override([](const std::string & path_model, const std::string & lang) {
for (size_t i = 0; i < g_contexts.size(); ++i) {
if (g_contexts[i] == nullptr) {
g_contexts[i] = whisper_init_from_file_with_params(path_model.c_str(), whisper_context_default_params());
@@ -138,8 +138,8 @@ EMSCRIPTEN_BINDINGS(stream) {
if (g_worker.joinable()) {
g_worker.join();
}
g_worker = std::thread([i]() {
stream_main(i);
g_worker = std::thread([i, lang]() {
stream_main(i, lang);
});
return i + 1;