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353 lines
11 KiB
353 lines
11 KiB
#include "ggml.h"
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#include "common.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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#include <regex>
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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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// compute similarity between two strings using Levenshtein distance
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static float similarity(const std::string & s0, const std::string & s1) {
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const size_t len0 = s0.size() + 1;
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const size_t len1 = s1.size() + 1;
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std::vector<int> col(len1, 0);
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std::vector<int> prevCol(len1, 0);
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for (size_t i = 0; i < len1; i++) {
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prevCol[i] = i;
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}
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for (size_t i = 0; i < len0; i++) {
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col[0] = i;
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for (size_t j = 1; j < len1; j++) {
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col[j] = std::min(std::min(1 + col[j - 1], 1 + prevCol[j]), prevCol[j - 1] + (s0[i - 1] == s1[j - 1] ? 0 : 1));
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}
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col.swap(prevCol);
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}
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const float dist = prevCol[len1 - 1];
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return 1.0f - (dist / std::max(s0.size(), s1.size()));
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}
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void command_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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std::string command_transcribe(whisper_context * ctx, const whisper_full_params & wparams, const std::vector<float> & pcmf32, float & prob, int64_t & t_ms) {
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const auto t_start = std::chrono::high_resolution_clock::now();
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prob = 0.0f;
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t_ms = 0;
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if (whisper_full(ctx, wparams, pcmf32.data(), pcmf32.size()) != 0) {
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return "";
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}
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int prob_n = 0;
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std::string result;
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const int n_segments = whisper_full_n_segments(ctx);
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for (int i = 0; i < n_segments; ++i) {
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const char * text = whisper_full_get_segment_text(ctx, i);
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result += text;
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const int n_tokens = whisper_full_n_tokens(ctx, i);
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for (int j = 0; j < n_tokens; ++j) {
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const auto token = whisper_full_get_token_data(ctx, i, j);
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prob += token.p;
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++prob_n;
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}
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}
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if (prob_n > 0) {
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prob /= prob_n;
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}
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const auto t_end = std::chrono::high_resolution_clock::now();
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t_ms = std::chrono::duration_cast<std::chrono::milliseconds>(t_end - t_start).count();
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return result;
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}
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void command_get_audio(int ms, int sample_rate, std::vector<float> & audio) {
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const int64_t n_samples = (ms * sample_rate) / 1000;
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int64_t n_take = 0;
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if (n_samples > (int) g_pcmf32.size()) {
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n_take = g_pcmf32.size();
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} else {
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n_take = n_samples;
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}
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audio.resize(n_take);
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std::copy(g_pcmf32.end() - n_take, g_pcmf32.end(), audio.begin());
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}
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void command_main(size_t index) {
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command_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("command: using %d threads\n", wparams.n_threads);
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bool have_prompt = false;
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bool ask_prompt = true;
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bool print_energy = false;
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float prob0 = 0.0f;
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float prob = 0.0f;
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std::vector<float> pcmf32_cur;
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std::vector<float> pcmf32_prompt;
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const std::string k_prompt = "Ok Whisper, start listening for commands.";
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// whisper context
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auto & ctx = g_contexts[index];
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const int32_t vad_ms = 2000;
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const int32_t prompt_ms = 5000;
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const int32_t command_ms = 4000;
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const float vad_thold = 0.1f;
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const float freq_thold = -1.0f;
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while (g_running) {
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// delay
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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if (ask_prompt) {
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fprintf(stdout, "\n");
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fprintf(stdout, "%s: Say the following phrase: '%s%s%s'\n", __func__, "\033[1m", k_prompt.c_str(), "\033[0m");
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fprintf(stdout, "\n");
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{
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char txt[1024];
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snprintf(txt, sizeof(txt), "Say the following phrase: '%s'", k_prompt.c_str());
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command_set_status(txt);
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}
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ask_prompt = false;
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}
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int64_t t_ms = 0;
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{
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command_get_audio(vad_ms, WHISPER_SAMPLE_RATE, pcmf32_cur);
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if (::vad_simple(pcmf32_cur, WHISPER_SAMPLE_RATE, 1000, vad_thold, freq_thold, print_energy)) {
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fprintf(stdout, "%s: Speech detected! Processing ...\n", __func__);
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command_set_status("Speech detected! Processing ...");
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if (!have_prompt) {
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command_get_audio(prompt_ms, WHISPER_SAMPLE_RATE, pcmf32_cur);
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const auto txt = ::trim(::command_transcribe(ctx, wparams, pcmf32_cur, prob0, t_ms));
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fprintf(stdout, "%s: Heard '%s%s%s', (t = %d ms)\n", __func__, "\033[1m", txt.c_str(), "\033[0m", (int) t_ms);
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const float sim = similarity(txt, k_prompt);
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if (txt.length() < 0.8*k_prompt.length() || txt.length() > 1.2*k_prompt.length() || sim < 0.8f) {
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fprintf(stdout, "%s: WARNING: prompt not recognized, try again\n", __func__);
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ask_prompt = true;
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} else {
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fprintf(stdout, "\n");
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fprintf(stdout, "%s: The prompt has been recognized!\n", __func__);
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fprintf(stdout, "%s: Waiting for voice commands ...\n", __func__);
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fprintf(stdout, "\n");
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{
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char txt[1024];
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snprintf(txt, sizeof(txt), "Success! Waiting for voice commands ...");
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command_set_status(txt);
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}
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// save the audio for the prompt
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pcmf32_prompt = pcmf32_cur;
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have_prompt = true;
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}
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} else {
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command_get_audio(command_ms, WHISPER_SAMPLE_RATE, pcmf32_cur);
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// prepend the prompt audio
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pcmf32_cur.insert(pcmf32_cur.begin(), pcmf32_prompt.begin(), pcmf32_prompt.end());
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const auto txt = ::trim(::command_transcribe(ctx, wparams, pcmf32_cur, prob, t_ms));
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prob = 100.0f*(prob - prob0);
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fprintf(stdout, "%s: heard '%s'\n", __func__, txt.c_str());
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// find the prompt in the text
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float best_sim = 0.0f;
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size_t best_len = 0;
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for (int n = 0.8*k_prompt.size(); n <= 1.2*k_prompt.size(); ++n) {
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const auto prompt = txt.substr(0, n);
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const float sim = similarity(prompt, k_prompt);
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//fprintf(stderr, "%s: prompt = '%s', sim = %f\n", __func__, prompt.c_str(), sim);
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if (sim > best_sim) {
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best_sim = sim;
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best_len = n;
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}
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}
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const std::string command = ::trim(txt.substr(best_len));
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fprintf(stdout, "%s: Command '%s%s%s', (t = %d ms)\n", __func__, "\033[1m", command.c_str(), "\033[0m", (int) t_ms);
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fprintf(stdout, "\n");
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{
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char txt[1024];
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snprintf(txt, sizeof(txt), "Command '%s', (t = %d ms)", command.c_str(), (int) t_ms);
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command_set_status(txt);
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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 = command;
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}
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}
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g_pcmf32.clear();
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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(command) {
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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_from_file(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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command_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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