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83a3f71ce7d8499e056fc0512caa732183048215
freeswitch-modules/mod_google_tts/google_glue.cpp
Hoan HL 83a3f71ce7 wip 
Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>
2024-04-17 15:28:03 +00:00

405 lines
16 KiB
C++
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#include "mod_google_tts.h"
#include <switch.h>
#include <boost/circular_buffer.hpp>
#include <cstdlib>
#include <string>
#include <chrono>
#include <thread>
#include "google/cloud/texttospeech/v1/cloud_tts.grpc.pb.h"
#include <grpc++/grpc++.h>
using google::cloud::texttospeech::v1::SynthesizeSpeechRequest;
using google::cloud::texttospeech::v1::SynthesizeSpeechResponse;
using google::cloud::texttospeech::v1::TextToSpeech;
using google::cloud::texttospeech::v1::Voice;
using google::cloud::texttospeech::v1::SsmlVoiceGender;
using google::cloud::texttospeech::v1::SsmlVoiceGender_Name;
using google::cloud::texttospeech::v1::SynthesisInput;
using google::cloud::texttospeech::v1::AudioEncoding;
#define BUFFER_SIZE 8129
typedef boost::circular_buffer<uint16_t> CircularBuffer_t;
static std::string fullDirPath;
static std::shared_ptr<grpc::Channel> create_grpc_channel(switch_channel_t *channel) {
const char* google_uri = "texttospeech.googleapis.com";
const char* var;
if (var = switch_channel_get_variable(channel, "GOOGLE_TTS_APPLICATION_CREDENTIALS")) {
auto channelCreds = grpc::SslCredentials(grpc::SslCredentialsOptions());
auto callCreds = grpc::ServiceAccountJWTAccessCredentials(var);
auto creds = grpc::CompositeChannelCredentials(channelCreds, callCreds);
return grpc::CreateChannel(google_uri, creds);
}
else {
auto creds = grpc::GoogleDefaultCredentials();
return grpc::CreateChannel(google_uri, creds);
}
}
static void start_synthesis(const char* text, google_t* g) {
try {
SynthesizeSpeechRequest request;
SynthesizeSpeechResponse response;
grpc::ClientContext context;
auto input = request.mutable_input();
auto voice = request.mutable_voice();
auto custom_voice = voice->mutable_custom_voice();
auto audio_config = request.mutable_audio_config();
/* lock and unlock session */
switch_core_session_t *psession = switch_core_session_locate(g->session_id);
switch_channel_t *swChannel = switch_core_session_get_channel(psession);
switch_core_session_rwunlock(psession);
auto channel = create_grpc_channel(swChannel);
auto stub = TextToSpeech::NewStub(channel);
if (strstr(text, "<speak") == text) {
input->set_ssml(text);
}
else {
input->set_text(text);
}
if (g->gender) {
if (strcmp(g->gender, "MALE") == 0) {
voice->set_ssml_gender(google::cloud::texttospeech::v1::SsmlVoiceGender::MALE);
} else if (strcmp(g->gender, "FEMALE") == 0) {
voice->set_ssml_gender(google::cloud::texttospeech::v1::SsmlVoiceGender::FEMALE);
} else if (strcmp(g->gender, "NEUTRAL") == 0) {
voice->set_ssml_gender(google::cloud::texttospeech::v1::SsmlVoiceGender::NEUTRAL);
} else {
voice->set_ssml_gender(google::cloud::texttospeech::v1::SsmlVoiceGender::SSML_VOICE_GENDER_UNSPECIFIED);
}
}
if (g->model) {
custom_voice->set_model(g->model);
if (strcmp(g->reported_usage, "OFFLINE") == 0) {
custom_voice->set_reported_usage(google::cloud::texttospeech::v1::CustomVoiceParams_ReportedUsage::CustomVoiceParams_ReportedUsage_OFFLINE);
} else if (strcmp(g->reported_usage, "REALTIME") == 0) {
custom_voice->set_reported_usage(google::cloud::texttospeech::v1::CustomVoiceParams_ReportedUsage::CustomVoiceParams_ReportedUsage_REALTIME);
} else {
custom_voice->set_reported_usage(google::cloud::texttospeech::v1::CustomVoiceParams_ReportedUsage::CustomVoiceParams_ReportedUsage_REPORTED_USAGE_UNSPECIFIED);
}
} else {
voice->set_name(g->voice_name);
}
voice->set_language_code(g->language);
audio_config->set_audio_encoding(AudioEncoding::LINEAR16);
audio_config->set_sample_rate_hertz(8000);
grpc::Status status = stub->SynthesizeSpeech(&context, request, &response);
if (!status.ok()) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
"start_synthesis: error synthesizing speech: %s: details: %s\n",
status.error_message().c_str(), status.error_details().c_str());
return;
}
g->response_code = 200;
auto audioData = response.audio_content();
if (g->flushed) return;
bool fireEvent = false;
CircularBuffer_t *cBuffer = (CircularBuffer_t *) g->circularBuffer;
if (g->file) {
// google return linear16 wav data that contains 44 bytes wav header, let remove them
fwrite(audioData.data() + 44, 1, audioData.size() - 44, g->file);
}
/**
* this sort of reinterpretation can be dangerous as a general rule, but in this case we know that the data
* is 16-bit PCM, so it's safe to do this and its much faster than copying the data byte by byte
*/
// google return linear16 wav data that contains 44 bytes wav header, let remove them
const uint16_t* begin = reinterpret_cast<const uint16_t*>(audioData.data() + 44);
const uint16_t* end = reinterpret_cast<const uint16_t*>(audioData.data() + audioData.size());
/* lock as briefly as possible */
switch_mutex_lock(g->mutex);
if (cBuffer->capacity() - cBuffer->size() < audioData.size()) {
cBuffer->set_capacity(cBuffer->size() + std::max( audioData.size(), (size_t)BUFFER_SIZE));
}
cBuffer->insert(cBuffer->end(), begin, end);
switch_mutex_unlock(g->mutex);
if (0 == g->reads++) {
fireEvent = true;
}
if (fireEvent && g->session_id) {
auto endTime = std::chrono::high_resolution_clock::now();
auto startTime = *static_cast<std::chrono::time_point<std::chrono::high_resolution_clock>*>(g->startTime);
auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(endTime - startTime);
auto time_to_first_byte_ms = std::to_string(duration.count());
switch_core_session_t* session = switch_core_session_locate(g->session_id);
if (session) {
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_core_session_rwunlock(session);
if (channel) {
switch_event_t *event;
if (switch_event_create(&event, SWITCH_EVENT_PLAYBACK_START) == SWITCH_STATUS_SUCCESS) {
switch_channel_event_set_data(channel, event);
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Playback-File-Type", "tts_stream");
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_time_to_first_byte_ms", time_to_first_byte_ms.c_str());
if (g->cache_filename) {
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_cache_filename", g->cache_filename);
}
switch_event_fire(&event);
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "mod_google_tts start_synthesis: failed to create event\n");
}
}else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "mod_google_tts start_synthesis: channel not found\n");
}
}
}
} catch (const std::exception& e) {
g->response_code = 500;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "mod_google_tts: Exception in start_synthesis %s\n", e.what());
}
g->draining = 1;
}
extern "C" {
switch_status_t google_speech_load() {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "google_speech_loading..\n");
/* create temp folder for cache files */
const char* baseDir = std::getenv("JAMBONZ_TMP_CACHE_FOLDER");
if (!baseDir) {
baseDir = "/tmp/";
}
if (strcmp(baseDir, "/") == 0) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "failed to create folder %s\n", baseDir);
return SWITCH_STATUS_FALSE;
}
fullDirPath = std::string(baseDir) + "jambonz-tts-cache-files";
// Create the directory with read, write, and execute permissions for everyone
mode_t oldMask = umask(0);
int result = mkdir(fullDirPath.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);
umask(oldMask);
if (result != 0) {
if (errno != EEXIST) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "failed to create folder %s\n", fullDirPath.c_str());
fullDirPath = "";
}
else switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "folder %s already exists\n", fullDirPath.c_str());
}
else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "created folder %s\n", fullDirPath.c_str());
}
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "google_speech_loaded..\n");
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_open(google_t* google) {
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_feed_tts(google_t* g, char* text, switch_speech_flag_t *flags) {
const int MAX_CHARS = 20;
char tempText[MAX_CHARS + 4]; // +4 for the ellipsis and null terminator
if (strlen(text) > MAX_CHARS) {
strncpy(tempText, text, MAX_CHARS);
strcpy(tempText + MAX_CHARS, "...");
} else {
strcpy(tempText, text);
}
/* open cache file */
if (g->cache_audio && fullDirPath.length() > 0) {
switch_uuid_t uuid;
char uuid_str[SWITCH_UUID_FORMATTED_LENGTH + 1];
char outfile[512] = "";
int fd;
switch_uuid_get(&uuid);
switch_uuid_format(uuid_str, &uuid);
switch_snprintf(outfile, sizeof(outfile), "%s%s%s.r8", fullDirPath.c_str(), SWITCH_PATH_SEPARATOR, uuid_str);
g->cache_filename = strdup(outfile);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "writing audio cache file to %s\n", g->cache_filename);
mode_t oldMask = umask(0);
fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
umask(oldMask);
if (fd == -1 ) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error opening cache file %s: %s\n", outfile, strerror(errno));
}
else {
g->file = fdopen(fd, "wb");
if (!g->file) {
close(fd);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error opening cache file %s: %s\n", outfile, strerror(errno));
}
}
}
if (!g->language) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "google_speech_feed_tts: no language provided\n");
return SWITCH_STATUS_FALSE;
}
if (!g->voice_name && !g->model) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "google_speech_feed_tts: no voice_name or model provided\n");
return SWITCH_STATUS_FALSE;
}
if (g->rate != 8000 /*Hz*/) {
int err;
g->resampler = speex_resampler_init(1, 8000, g->rate, SWITCH_RESAMPLE_QUALITY, &err);
if (0 != err) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error initializing resampler: %s.\n", speex_resampler_strerror(err));
return SWITCH_STATUS_FALSE;
}
}
std::chrono::time_point<std::chrono::high_resolution_clock>* ptr = new std::chrono::time_point<std::chrono::high_resolution_clock>(std::chrono::high_resolution_clock::now());
g->startTime = ptr;
g->circularBuffer = (void *) new CircularBuffer_t(BUFFER_SIZE);
std::thread(start_synthesis, text, g).detach();
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "google_speech_feed_tts sent synthesize request\n");
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_read_tts(google_t* g, void *data, size_t *datalen, switch_speech_flag_t *flags) {
CircularBuffer_t *cBuffer = (CircularBuffer_t *) g->circularBuffer;
std::vector<uint16_t> pcm_data;
if (g->response_code > 0 && g->response_code != 200) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "google_speech_read_tts, returning failure\n") ;
return SWITCH_STATUS_FALSE;
}
if (g->flushed) {
return SWITCH_STATUS_BREAK;
}
switch_mutex_lock(g->mutex);
size_t bufSize = cBuffer->size();
if (cBuffer->empty()) {
switch_mutex_unlock(g->mutex);
if (g->draining) {
return SWITCH_STATUS_BREAK;
}
/* no audio available yet so send silence */
memset(data, 255, *datalen);
return SWITCH_STATUS_SUCCESS;
}
// google returned 8000hz 16 bit data, we have to take enough data based on call sample rate.
size_t size = std::min((*datalen/(2 * g->rate / 8000)), bufSize);
pcm_data.insert(pcm_data.end(), cBuffer->begin(), cBuffer->begin() + size);
cBuffer->erase(cBuffer->begin(), cBuffer->begin() + size);
switch_mutex_unlock(g->mutex);
size_t data_size = pcm_data.size();
if (g->resampler) {
std::vector<int16_t> in(pcm_data.begin(), pcm_data.end());
std::vector<int16_t> out((*datalen));
spx_uint32_t in_len = data_size;
spx_uint32_t out_len = out.size();
speex_resampler_process_interleaved_int(g->resampler, in.data(), &in_len, out.data(), &out_len);
if (out_len > out.size()) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Resampler output exceeded maximum buffer size!\n");
return SWITCH_STATUS_FALSE;
}
memcpy(data, out.data(), out_len * sizeof(int16_t));
*datalen = out_len * sizeof(int16_t);
} else {
memcpy(data, pcm_data.data(), data_size * sizeof(int16_t));
*datalen = data_size * sizeof(int16_t);
}
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_flush_tts(google_t* g) {
bool download_complete = g->response_code == 200;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "google_speech_flush_tts, download complete? %s\n", download_complete ? "yes" : "no") ;
CircularBuffer_t *cBuffer = (CircularBuffer_t *) g->circularBuffer;
delete cBuffer;
g->circularBuffer = nullptr ;
delete static_cast<std::chrono::time_point<std::chrono::high_resolution_clock>*>(g->startTime);
g->startTime = nullptr;
g->flushed = 1;
if (!download_complete) {
if (g->file) {
//switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "closing audio cache file %s because download was interrupted\n", g->cache_filename);
if (fclose(g->file) != 0) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "error closing audio cache file\n");
}
g->file = nullptr ;
}
if (g->cache_filename) {
//switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "removing audio cache file %s because download was interrupted\n", g->cache_filename);
if (unlink(g->cache_filename) != 0) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "cleanupConn: error removing audio cache file %s: %d:%s\n",
g->cache_filename, errno, strerror(errno));
}
free(g->cache_filename);
g->cache_filename = nullptr ;
}
}
if (g->session_id) {
switch_core_session_t* session = switch_core_session_locate(g->session_id);
if (session) {
switch_channel_t *channel = switch_core_session_get_channel(session);
/* unlock as quickly as possible */
switch_core_session_rwunlock(session);
if (channel) {
switch_event_t *event;
if (switch_event_create(&event, SWITCH_EVENT_PLAYBACK_STOP) == SWITCH_STATUS_SUCCESS) {
switch_channel_event_set_data(channel, event);
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Playback-File-Type", "tts_stream");
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_google_response_code", std::to_string(g->response_code).c_str());
if (g->cache_filename && download_complete) {
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_cache_filename", g->cache_filename);
}
if (!download_complete && g->err_msg) {
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_error", g->err_msg);
}
switch_event_fire(&event);
}
else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "write_cb: failed to create event\n");
}
}
else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "write_cb: channel not found\n");
}
}
}
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_close(google_t* g) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "google_speech_close\n") ;
if (g->resampler) {
speex_resampler_destroy(g->resampler);
}
g->resampler = NULL;
return SWITCH_STATUS_SUCCESS;
}
switch_status_t google_speech_unload() {
return SWITCH_STATUS_SUCCESS;
}
}
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