stream.wasm : add web-based real-time transcription (#112)
Georgi Gerganov
2 years ago
parent
be16dfa038
commit
3c390ffe38
@ -0,0 +1,47 @@
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#
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# libstream
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#
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set(TARGET libstream)
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add_executable(${TARGET}
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emscripten.cpp
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)
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target_link_libraries(${TARGET} PRIVATE
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whisper
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)
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unset(EXTRA_FLAGS)
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if (WHISPER_WASM_SINGLE_FILE)
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set(EXTRA_FLAGS "-s SINGLE_FILE=1")
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message(STATUS "Embedding WASM inside stream.js")
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add_custom_command(
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TARGET ${TARGET} POST_BUILD
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COMMAND ${CMAKE_COMMAND} -E copy
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${CMAKE_BINARY_DIR}/bin/libstream.js
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${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/stream.wasm/stream.js
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)
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endif()
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set_target_properties(${TARGET} PROPERTIES LINK_FLAGS " \
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--bind \
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-s USE_PTHREADS=1 \
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-s PTHREAD_POOL_SIZE=8 \
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-s INITIAL_MEMORY=1024MB \
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-s TOTAL_MEMORY=1024MB \
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-s FORCE_FILESYSTEM=1 \
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-s EXPORTED_RUNTIME_METHODS=\"['print', 'printErr', 'ccall', 'cwrap']\" \
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${EXTRA_FLAGS} \
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")
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#
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# stream.wasm
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#
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set(TARGET stream.wasm)
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configure_file(${CMAKE_CURRENT_SOURCE_DIR}/index-tmpl.html ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/index.html @ONLY)
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configure_file(${CMAKE_CURRENT_SOURCE_DIR}/../helpers.js ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/helpers.js @ONLY)
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@ -0,0 +1,20 @@
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# stream.wasm
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Real-time transcription in the browser using WebAssembly
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Online demo: https://whisper.ggerganov.com/stream/
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## Build instructions
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```bash
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# build using Emscripten (v3.1.2)
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git clone https://github.com/ggerganov/whisper.cpp
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cd whisper.cpp
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mkdir build-em && cd build-em
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emcmake cmake ..
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make -j
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# copy the produced page to your HTTP path
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cp bin/stream.wasm/* /path/to/html/
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cp bin/libstream.worker.js /path/to/html/
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```
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@ -0,0 +1,213 @@
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#include "ggml.h"
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#include "whisper.h"
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#include <emscripten.h>
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#include <emscripten/bind.h>
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#include <atomic>
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#include <cmath>
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#include <mutex>
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#include <string>
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#include <thread>
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#include <vector>
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constexpr int N_THREAD = 8;
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std::vector<struct whisper_context *> g_contexts(4, nullptr);
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std::mutex g_mutex;
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std::thread g_worker;
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std::atomic<bool> g_running(false);
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std::string g_status = "";
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std::string g_status_forced = "";
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std::string g_transcribed = "";
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std::vector<float> g_pcmf32;
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void stream_set_status(const std::string & status) {
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std::lock_guard<std::mutex> lock(g_mutex);
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g_status = status;
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}
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void stream_main(size_t index) {
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stream_set_status("loading data ...");
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struct whisper_full_params wparams = whisper_full_default_params(whisper_sampling_strategy::WHISPER_SAMPLING_GREEDY);
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wparams.n_threads = std::min(N_THREAD, (int) std::thread::hardware_concurrency());
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wparams.offset_ms = 0;
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wparams.translate = false;
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wparams.no_context = true;
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wparams.single_segment = true;
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wparams.print_realtime = false;
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wparams.print_progress = false;
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wparams.print_timestamps = true;
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wparams.print_special = false;
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wparams.max_tokens = 32;
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wparams.audio_ctx = 768; // partial encoder context for better performance
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wparams.language = "en";
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printf("stream: using %d threads\n", N_THREAD);
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std::vector<float> pcmf32;
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// whisper context
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auto & ctx = g_contexts[index];
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// 5 seconds interval
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const int64_t window_samples = 5*WHISPER_SAMPLE_RATE;
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while (g_running) {
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stream_set_status("waiting for audio ...");
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{
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std::unique_lock<std::mutex> lock(g_mutex);
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if (g_pcmf32.size() < 1024) {
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lock.unlock();
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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continue;
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}
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pcmf32 = std::vector<float>(g_pcmf32.end() - std::min((int64_t) g_pcmf32.size(), window_samples), g_pcmf32.end());
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g_pcmf32.clear();
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}
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{
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const auto t_start = std::chrono::high_resolution_clock::now();
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stream_set_status("running whisper ...");
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int ret = whisper_full(ctx, wparams, pcmf32.data(), pcmf32.size());
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if (ret != 0) {
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printf("whisper_full() failed: %d\n", ret);
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break;
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}
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const auto t_end = std::chrono::high_resolution_clock::now();
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printf("stream: whisper_full() returned %d in %f seconds\n", ret, std::chrono::duration<double>(t_end - t_start).count());
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}
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{
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std::string text_heard;
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{
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const int n_segments = whisper_full_n_segments(ctx);
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for (int i = n_segments - 1; i < n_segments; ++i) {
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const char * text = whisper_full_get_segment_text(ctx, i);
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const int64_t t0 = whisper_full_get_segment_t0(ctx, i);
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const int64_t t1 = whisper_full_get_segment_t1(ctx, i);
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printf("transcribed: %s\n", text);
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text_heard += text;
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}
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}
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{
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std::lock_guard<std::mutex> lock(g_mutex);
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g_transcribed = text_heard;
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}
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}
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}
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if (index < g_contexts.size()) {
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whisper_free(g_contexts[index]);
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g_contexts[index] = nullptr;
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}
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}
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EMSCRIPTEN_BINDINGS(stream) {
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emscripten::function("init", emscripten::optional_override([](const std::string & path_model) {
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for (size_t i = 0; i < g_contexts.size(); ++i) {
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if (g_contexts[i] == nullptr) {
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g_contexts[i] = whisper_init(path_model.c_str());
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if (g_contexts[i] != nullptr) {
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g_running = true;
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if (g_worker.joinable()) {
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g_worker.join();
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}
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g_worker = std::thread([i]() {
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stream_main(i);
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});
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return i + 1;
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} else {
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return (size_t) 0;
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}
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}
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}
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return (size_t) 0;
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}));
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emscripten::function("free", emscripten::optional_override([](size_t index) {
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if (g_running) {
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g_running = false;
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}
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}));
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emscripten::function("set_audio", emscripten::optional_override([](size_t index, const emscripten::val & audio) {
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--index;
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if (index >= g_contexts.size()) {
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return -1;
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}
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if (g_contexts[index] == nullptr) {
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return -2;
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}
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{
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std::lock_guard<std::mutex> lock(g_mutex);
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const int n = audio["length"].as<int>();
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emscripten::val heap = emscripten::val::module_property("HEAPU8");
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emscripten::val memory = heap["buffer"];
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g_pcmf32.resize(n);
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emscripten::val memoryView = audio["constructor"].new_(memory, reinterpret_cast<uintptr_t>(g_pcmf32.data()), n);
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memoryView.call<void>("set", audio);
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}
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return 0;
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}));
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emscripten::function("get_transcribed", emscripten::optional_override([]() {
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std::string transcribed;
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{
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std::lock_guard<std::mutex> lock(g_mutex);
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transcribed = std::move(g_transcribed);
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}
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return transcribed;
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}));
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emscripten::function("get_status", emscripten::optional_override([]() {
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std::string status;
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{
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std::lock_guard<std::mutex> lock(g_mutex);
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status = g_status_forced.empty() ? g_status : g_status_forced;
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}
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return status;
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}));
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emscripten::function("set_status", emscripten::optional_override([](const std::string & status) {
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{
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std::lock_guard<std::mutex> lock(g_mutex);
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g_status_forced = status;
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}
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}));
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}
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@ -0,0 +1,385 @@
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<!doctype html>
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<html lang="en-us">
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<head>
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<title>stream : Real-time Whisper transcription in WebAssembly</title>
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<style>
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#output {
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width: 100%;
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height: 100%;
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margin: 0 auto;
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margin-top: 10px;
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border-left: 0px;
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border-right: 0px;
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padding-left: 0px;
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padding-right: 0px;
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display: block;
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background-color: black;
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color: white;
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font-size: 10px;
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font-family: 'Lucida Console', Monaco, monospace;
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outline: none;
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white-space: pre;
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overflow-wrap: normal;
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overflow-x: scroll;
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}
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</style>
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</head>
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<body>
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<div id="main-container">
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<b>stream : Real-time Whisper transcription in WebAssembly</b>
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<br><br>
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You can find more about this project on <a href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/stream.wasm">GitHub</a>.
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<br><br>
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<hr>
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Select the model you would like to use, click the "Start" button and start speaking
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<br><br>
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<div id="model-whisper">
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Whisper model: <span id="model-whisper-status"></span>
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<button id="fetch-whisper-tiny-en" onclick="loadWhisper('tiny.en')">tiny.en (75 MB)</button>
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<button id="fetch-whisper-base-en" onclick="loadWhisper('base.en')">base.en (142 MB)</button>
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<span id="fetch-whisper-progress"></span>
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<!--
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<input type="file" id="file" name="file" onchange="loadFile(event, 'whisper.bin')" />
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-->
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</div>
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<br>
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<div id="input">
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<button id="start" onclick="onStart()" disabled>Start</button>
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<button id="stop" onclick="onStop()" disabled>Stop</button>
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<button id="clear" onclick="clearCache()">Clear Cache</button>
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</div>
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<br>
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<div id="state">
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Status: <b><span id="state-status">not started</span></b>
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<pre id="state-transcribed">[The transcribed text will be displayed here]</pre>
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</div>
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<hr>
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Debug output:
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<textarea id="output" rows="20"></textarea>
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<br>
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<b>Troubleshooting</b>
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<br><br>
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The page does some heavy computations, so make sure:
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<ul>
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<li>To use a modern web browser (e.g. Chrome, Firefox)</li>
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<li>To use a fast desktop or laptop computer (i.e. not a mobile phone)</li>
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<li>Your browser supports WASM <a href="https://webassembly.org/roadmap/">Fixed-width SIMD</a></li>
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</ul>
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<div class="cell-version">
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<span>
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Build time: <span class="nav-link">@GIT_DATE@</span> |
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Commit hash: <a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/commit/@GIT_SHA1@">@GIT_SHA1@</a> |
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Commit subject: <span class="nav-link">@GIT_COMMIT_SUBJECT@</span> |
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<a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/stream.wasm">Source Code</a> |
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</span>
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</div>
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</div>
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<script type="text/javascript" src="helpers.js"></script>
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<script type='text/javascript'>
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const kRestartRecording_s = 15;
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const kSampleRate = 16000;
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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window.OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
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// web audio context
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var context = null;
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// audio data
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var audio = null;
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var audio0 = null;
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// the stream instance
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var instance = null;
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// model name
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var model_whisper = null;
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var Module = {
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print: printTextarea,
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printErr: printTextarea,
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setStatus: function(text) {
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printTextarea('js: ' + text);
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},
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monitorRunDependencies: function(left) {
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},
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preRun: function() {
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printTextarea('js: Preparing ...');
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},
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postRun: function() {
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printTextarea('js: Initialized successfully!');
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}
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};
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//
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// fetch models
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//
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let dbVersion = 1
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let dbName = 'whisper.ggerganov.com';
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let indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB
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function storeFS(fname, buf) {
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// write to WASM file using FS_createDataFile
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// if the file exists, delete it
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try {
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Module.FS_unlink(fname);
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} catch (e) {
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// ignore
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}
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Module.FS_createDataFile("/", fname, buf, true, true);
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printTextarea('storeFS: stored model: ' + fname + ' size: ' + buf.length);
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document.getElementById('model-whisper-status').innerHTML = 'loaded "' + model_whisper + '"!';
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if (model_whisper != null) {
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document.getElementById('start').disabled = false;
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document.getElementById('stop' ).disabled = true;
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}
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}
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function loadWhisper(model) {
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let urls = {
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'tiny.en': 'https://whisper.ggerganov.com/ggml-model-whisper-tiny.en.bin',
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'base.en': 'https://whisper.ggerganov.com/ggml-model-whisper-base.en.bin',
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};
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let sizes = {
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'tiny.en': 75,
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'base.en': 142,
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};
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let url = urls[model];
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let dst = 'whisper.bin';
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let size_mb = sizes[model];
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model_whisper = model;
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document.getElementById('fetch-whisper-tiny-en').style.display = 'none';
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document.getElementById('fetch-whisper-base-en').style.display = 'none';
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document.getElementById('model-whisper-status').innerHTML = 'loading "' + model + '" ... ';
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cbProgress = function(p) {
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let el = document.getElementById('fetch-whisper-progress');
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el.innerHTML = Math.round(100*p) + '%';
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};
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cbCancel = function() {
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var el;
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el = document.getElementById('fetch-whisper-tiny-en'); if (el) el.style.display = 'inline-block';
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el = document.getElementById('fetch-whisper-base-en'); if (el) el.style.display = 'inline-block';
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el = document.getElementById('model-whisper-status'); if (el) el.innerHTML = '';
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};
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loadRemote(url, dst, size_mb, cbProgress, storeFS, cbCancel, printTextarea);
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}
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//
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// microphone
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//
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var mediaRecorder = null;
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var doRecording = false;
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var startTime = 0;
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function stopRecording() {
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Module.set_status("paused");
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doRecording = false;
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audio0 = null;
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audio = null;
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context = null;
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}
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function startRecording() {
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if (!context) {
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context = new AudioContext({
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sampleRate: 16000,
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channelCount: 1,
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echoCancellation: false,
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autoGainControl: true,
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noiseSuppression: true,
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});
|
||||
}
|
||||
|
||||
Module.set_status("");
|
||||
|
||||
document.getElementById('start').disabled = true;
|
||||
document.getElementById('stop').disabled = false;
|
||||
|
||||
doRecording = true;
|
||||
startTime = Date.now();
|
||||
|
||||
var chunks = [];
|
||||
var stream = null;
|
||||
|
||||
navigator.mediaDevices.getUserMedia({audio: true, video: false})
|
||||
.then(function(s) {
|
||||
stream = s;
|
||||
mediaRecorder = new MediaRecorder(stream);
|
||||
mediaRecorder.ondataavailable = function(e) {
|
||||
chunks.push(e.data);
|
||||
|
||||
var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
|
||||
var reader = new FileReader();
|
||||
|
||||
reader.onload = function(event) {
|
||||
var buf = new Uint8Array(reader.result);
|
||||
|
||||
if (!context) {
|
||||
return;
|
||||
}
|
||||
context.decodeAudioData(buf.buffer, function(audioBuffer) {
|
||||
var offlineContext = new OfflineAudioContext(audioBuffer.numberOfChannels, audioBuffer.length, audioBuffer.sampleRate);
|
||||
var source = offlineContext.createBufferSource();
|
||||
source.buffer = audioBuffer;
|
||||
source.connect(offlineContext.destination);
|
||||
source.start(0);
|
||||
|
||||
offlineContext.startRendering().then(function(renderedBuffer) {
|
||||
audio = renderedBuffer.getChannelData(0);
|
||||
|
||||
//printTextarea('js: audio recorded, size: ' + audio.length + ', old size: ' + (audio0 == null ? 0 : audio0.length));
|
||||
|
||||
var audioAll = new Float32Array(audio0 == null ? audio.length : audio0.length + audio.length);
|
||||
if (audio0 != null) {
|
||||
audioAll.set(audio0, 0);
|
||||
}
|
||||
audioAll.set(audio, audio0 == null ? 0 : audio0.length);
|
||||
|
||||
if (instance) {
|
||||
Module.set_audio(instance, audioAll);
|
||||
}
|
||||
});
|
||||
}, function(e) {
|
||||
audio = null;
|
||||
});
|
||||
}
|
||||
|
||||
reader.readAsArrayBuffer(blob);
|
||||
};
|
||||
|
||||
mediaRecorder.onstop = function(e) {
|
||||
if (doRecording) {
|
||||
setTimeout(function() {
|
||||
startRecording();
|
||||
});
|
||||
}
|
||||
};
|
||||
|
||||
mediaRecorder.start(5000);
|
||||
})
|
||||
.catch(function(err) {
|
||||
printTextarea('js: error getting audio stream: ' + err);
|
||||
});
|
||||
|
||||
var interval = setInterval(function() {
|
||||
if (!doRecording) {
|
||||
clearInterval(interval);
|
||||
mediaRecorder.stop();
|
||||
stream.getTracks().forEach(function(track) {
|
||||
track.stop();
|
||||
});
|
||||
|
||||
document.getElementById('start').disabled = false;
|
||||
document.getElementById('stop').disabled = true;
|
||||
|
||||
mediaRecorder = null;
|
||||
}
|
||||
|
||||
// if audio length is more than kRestartRecording_s seconds, restart recording
|
||||
if (audio != null && audio.length > kSampleRate*kRestartRecording_s) {
|
||||
if (doRecording) {
|
||||
//printTextarea('js: restarting recording');
|
||||
|
||||
clearInterval(interval);
|
||||
audio0 = audio;
|
||||
audio = null;
|
||||
mediaRecorder.stop();
|
||||
stream.getTracks().forEach(function(track) {
|
||||
track.stop();
|
||||
});
|
||||
}
|
||||
}
|
||||
}, 250);
|
||||
}
|
||||
|
||||
//
|
||||
// main
|
||||
//
|
||||
|
||||
var nLines = 0;
|
||||
var intervalUpdate = null;
|
||||
var transcribedAll = '';
|
||||
|
||||
function onStart() {
|
||||
if (!instance) {
|
||||
instance = Module.init('whisper.bin');
|
||||
|
||||
if (instance) {
|
||||
printTextarea("js: whisper initialized, instance: " + instance);
|
||||
}
|
||||
}
|
||||
|
||||
if (!instance) {
|
||||
printTextarea("js: failed to initialize whisper");
|
||||
return;
|
||||
}
|
||||
|
||||
startRecording();
|
||||
|
||||
intervalUpdate = setInterval(function() {
|
||||
var transcribed = Module.get_transcribed();
|
||||
|
||||
if (transcribed != null && transcribed.length > 1) {
|
||||
transcribedAll += transcribed + '<br>';
|
||||
nLines++;
|
||||
|
||||
// if more than 10 lines, remove the first line
|
||||
if (nLines > 10) {
|
||||
var i = transcribedAll.indexOf('<br>');
|
||||
if (i > 0) {
|
||||
transcribedAll = transcribedAll.substring(i + 4);
|
||||
nLines--;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
document.getElementById('state-status').innerHTML = Module.get_status();
|
||||
document.getElementById('state-transcribed').innerHTML = transcribedAll;
|
||||
}, 100);
|
||||
}
|
||||
|
||||
function onStop() {
|
||||
stopRecording();
|
||||
}
|
||||
|
||||
</script>
|
||||
<script type="text/javascript" src="stream.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in new issue