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https://github.com/jambonz/freeswitch-modules.git
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support azure tts stream (#13)
* support azure stream * delete trash file * wip * wip * wip * wip * wip * wip * wip * fire variable_tts_time_to_first_byte_ms
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Hoan Luu Huu authored and GitHub committed
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@@ -0,0 +1,380 @@
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#include "mod_azure_tts.h"
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#include <switch.h>
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#include <speechapi_cxx.h>
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#include <boost/circular_buffer.hpp>
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#include <cstdlib>
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#include <string>
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#include <chrono>
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#define BUFFER_SIZE 8129
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typedef boost::circular_buffer<uint16_t> CircularBuffer_t;
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using namespace Microsoft::CognitiveServices::Speech;
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static std::string fullDirPath;
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extern "C" {
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switch_status_t azure_speech_load() {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "azure_speech_loading..\n");
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/* create temp folder for cache files */
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const char* baseDir = std::getenv("JAMBONZ_TMP_CACHE_FOLDER");
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if (!baseDir) {
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baseDir = "/var/";
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}
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if (strcmp(baseDir, "/") == 0) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "failed to create folder %s\n", baseDir);
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return SWITCH_STATUS_FALSE;
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}
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fullDirPath = std::string(baseDir) + "jambonz-tts-cache-files";
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// Create the directory with read, write, and execute permissions for everyone
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mode_t oldMask = umask(0);
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int result = mkdir(fullDirPath.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);
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umask(oldMask);
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if (result != 0) {
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if (errno != EEXIST) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "failed to create folder %s\n", fullDirPath.c_str());
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fullDirPath = "";
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}
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else switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "folder %s already exists\n", fullDirPath.c_str());
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}
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else {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "created folder %s\n", fullDirPath.c_str());
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}
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "azure_speech_loaded..\n");
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_open(azure_t* azure) {
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_feed_tts(azure_t* a, char* text, switch_speech_flag_t *flags) {
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const int MAX_CHARS = 20;
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char tempText[MAX_CHARS + 4]; // +4 for the ellipsis and null terminator
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if (strlen(text) > MAX_CHARS) {
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strncpy(tempText, text, MAX_CHARS);
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strcpy(tempText + MAX_CHARS, "...");
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} else {
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strcpy(tempText, text);
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}
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/* open cache file */
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if (a->cache_audio && fullDirPath.length() > 0) {
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switch_uuid_t uuid;
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char uuid_str[SWITCH_UUID_FORMATTED_LENGTH + 1];
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char outfile[512] = "";
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int fd;
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switch_uuid_get(&uuid);
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switch_uuid_format(uuid_str, &uuid);
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switch_snprintf(outfile, sizeof(outfile), "%s%s%s.r8", fullDirPath.c_str(), SWITCH_PATH_SEPARATOR, uuid_str);
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a->cache_filename = strdup(outfile);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "writing audio cache file to %s\n", a->cache_filename);
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mode_t oldMask = umask(0);
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fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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umask(oldMask);
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if (fd == -1 ) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error opening cache file %s: %s\n", outfile, strerror(errno));
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}
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else {
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a->file = fdopen(fd, "wb");
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if (!a->file) {
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close(fd);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error opening cache file %s: %s\n", outfile, strerror(errno));
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}
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}
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}
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if (!a->api_key) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "azure_speech_feed_tts: no api_key provided\n");
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return SWITCH_STATUS_FALSE;
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}
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if (!a->language) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "azure_speech_feed_tts: no language provided\n");
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return SWITCH_STATUS_FALSE;
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}
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if (a->session_id) {
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int err;
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switch_codec_implementation_t read_impl;
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switch_core_session_t *psession = switch_core_session_locate(a->session_id);
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switch_core_session_get_read_impl(psession, &read_impl);
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uint32_t samples_per_second = !strcasecmp(read_impl.iananame, "g722") ? read_impl.actual_samples_per_second : read_impl.samples_per_second;
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a->samples_rate = samples_per_second;
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if (samples_per_second != 8000 /*Hz*/) {
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a->resampler = speex_resampler_init(1, 8000, samples_per_second, SWITCH_RESAMPLE_QUALITY, &err);
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if (0 != err) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error initializing resampler: %s.\n", speex_resampler_strerror(err));
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return SWITCH_STATUS_FALSE;
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}
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}
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}
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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());
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a->startTime = ptr;
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a->circularBuffer = (void *) new CircularBuffer_t(BUFFER_SIZE);
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auto speechConfig = nullptr != a->endpoint ?
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(nullptr != a->api_key ?
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SpeechConfig::FromEndpoint(a->endpoint, a->api_key) :
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SpeechConfig::FromEndpoint(a->endpoint)) :
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SpeechConfig::FromSubscription(a->api_key, a->region ? a->region : "");
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speechConfig->SetSpeechSynthesisOutputFormat(SpeechSynthesisOutputFormat::Raw8Khz16BitMonoPcm);
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speechConfig->SetSpeechSynthesisLanguage(a->language);
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speechConfig->SetSpeechSynthesisVoiceName(a->voice_name);
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if (a->http_proxy_ip) {
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uint32_t port = a->http_proxy_port && a->http_proxy_port[0] != '\0' ? static_cast<uint32_t>(std::stoul(a->http_proxy_port)) : 80;
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speechConfig->SetProxy(a->http_proxy_ip, port);
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}
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if (nullptr != a->endpointId) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "azure_speech_feed_tts setting endpoint id: %s\n", a->endpointId);
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speechConfig->SetEndpointId(a->endpointId);
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}
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auto speechSynthesizer = SpeechSynthesizer::FromConfig(speechConfig);
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speechSynthesizer->SynthesisStarted += [a](const SpeechSynthesisEventArgs& e) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "azure_speech_feed_tts SynthesisStarted\n");
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a->response_code = 200;
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};
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speechSynthesizer->Synthesizing += [a](const SpeechSynthesisEventArgs& e) {
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bool fireEvent = false;
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CircularBuffer_t *cBuffer = (CircularBuffer_t *) a->circularBuffer;
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std::vector<uint16_t> pcm_data;
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Synthesizing: received data\n");
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if (a->flushed) {
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return;
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}
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{
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switch_mutex_lock(a->mutex);
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auto audioData = e.Result->GetAudioData();
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for (size_t i = 0; i < audioData->size(); i += sizeof(int16_t)) {
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int16_t value = static_cast<int16_t>((*audioData)[i]) | (static_cast<int16_t>((*audioData)[i + 1]) << 8);
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pcm_data.push_back(value);
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}
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/* and write to the file */
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size_t bytesResampled = pcm_data.size() * sizeof(uint16_t);
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if (a->file) fwrite(pcm_data.data(), sizeof(uint16_t), pcm_data.size(), a->file);
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// Resize the buffer if necessary
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if (cBuffer->capacity() - cBuffer->size() < (bytesResampled / sizeof(uint16_t))) {
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//TODO: if buffer exceeds some max size, return CURL_WRITEFUNC_ERROR to abort the transfer
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cBuffer->set_capacity(cBuffer->size() + std::max((bytesResampled / sizeof(uint16_t)), (size_t)BUFFER_SIZE));
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}
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/* Push the data into the buffer */
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cBuffer->insert(cBuffer->end(), pcm_data.data(), pcm_data.data() + pcm_data.size());
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switch_mutex_unlock(a->mutex);
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}
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if (0 == a->reads++) {
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fireEvent = true;
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}
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if (fireEvent && a->session_id) {
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auto endTime = std::chrono::high_resolution_clock::now();
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auto startTime = *static_cast<std::chrono::time_point<std::chrono::high_resolution_clock>*>(a->startTime);
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(endTime - startTime);
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auto time_to_first_byte_ms = std::to_string(duration.count());
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switch_core_session_t* session = switch_core_session_locate(a->session_id);
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if (session) {
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switch_channel_t *channel = switch_core_session_get_channel(session);
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if (channel) {
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switch_event_t *event;
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if (switch_event_create(&event, SWITCH_EVENT_PLAYBACK_START) == SWITCH_STATUS_SUCCESS) {
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_time_to_first_byte_ms", time_to_first_byte_ms.c_str());
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if (a->cache_filename) {
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_cache_filename", a->cache_filename);
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}
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switch_event_fire(&event);
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} else {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "speechSynthesizer->Synthesizing: failed to create event\n");
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}
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}else {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "speechSynthesizer->Synthesizing: channel not found\n");
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}
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switch_core_session_rwunlock(session);
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}
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}
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};
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speechSynthesizer->SynthesisCompleted += [a](const SpeechSynthesisEventArgs& e) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "azure_speech_feed_tts SynthesisCompleted\n");
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a->draining = 1;
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};
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speechSynthesizer->SynthesisCanceled += [a](const SpeechSynthesisEventArgs& e) {
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if (e.Result->Reason == ResultReason::Canceled) {
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auto cancellation = SpeechSynthesisCancellationDetails::FromResult(e.Result);
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a->response_code = static_cast<long int>(cancellation->ErrorCode);
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a->err_msg = strdup(cancellation->ErrorDetails.c_str());
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error synthsize tex %d with error string: %s.\n", static_cast<int>(cancellation->ErrorCode), cancellation->ErrorDetails.c_str());
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}
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};
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// switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "azure_speech_feed_tts before sending synthesize request\n");
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if (std::strncmp(text, "<speak", 6) == 0) {
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speechSynthesizer->SpeakSsmlAsync(text);
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} else {
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speechSynthesizer->SpeakTextAsync(text);
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}
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// switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "azure_speech_feed_tts sent synthesize request\n");
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_read_tts(azure_t* a, void *data, size_t *datalen, switch_speech_flag_t *flags) {
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CircularBuffer_t *cBuffer = (CircularBuffer_t *) a->circularBuffer;
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std::vector<uint16_t> pcm_data;
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{
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switch_mutex_lock(a->mutex);
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if (a->response_code > 0 && a->response_code != 200) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "azure_speech_read_tts, returning failure\n") ;
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return SWITCH_STATUS_FALSE;
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}
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if (a->flushed) {
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return SWITCH_STATUS_BREAK;
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}
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if (cBuffer->empty()) {
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if (a->draining) {
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switch_mutex_unlock(a->mutex);
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return SWITCH_STATUS_BREAK;
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}
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/* no audio available yet so send silence */
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memset(data, 255, *datalen);
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switch_mutex_unlock(a->mutex);
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return SWITCH_STATUS_SUCCESS;
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}
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// azure returned 8000hz 16 bit data, we have to take enough data based on call sample rate.
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size_t size = a->samples_rate ?
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std::min((*datalen/(2 * a->samples_rate / 8000)), cBuffer->size()) :
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std::min((*datalen/2), cBuffer->size());
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pcm_data.insert(pcm_data.end(), cBuffer->begin(), cBuffer->begin() + size);
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cBuffer->erase(cBuffer->begin(), cBuffer->begin() + size);
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switch_mutex_unlock(a->mutex);
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}
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size_t data_size = pcm_data.size();
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if (a->resampler) {
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std::vector<int16_t> in(pcm_data.begin(), pcm_data.end());
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std::vector<int16_t> out((*datalen));
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spx_uint32_t in_len = data_size;
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spx_uint32_t out_len = out.size();
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speex_resampler_process_interleaved_int(a->resampler, in.data(), &in_len, out.data(), &out_len);
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if (out_len > out.size()) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Resampler output exceeded maximum buffer size!\n");
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return SWITCH_STATUS_FALSE;
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}
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memcpy(data, out.data(), out_len * sizeof(int16_t));
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*datalen = out_len * sizeof(int16_t);
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} else {
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memcpy(data, pcm_data.data(), data_size * sizeof(int16_t));
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*datalen = data_size * sizeof(int16_t);
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}
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_flush_tts(azure_t* a) {
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bool download_complete = a->response_code == 200;
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "azure_speech_flush_tts, download complete? %s\n", download_complete ? "yes" : "no") ;
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CircularBuffer_t *cBuffer = (CircularBuffer_t *) a->circularBuffer;
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delete cBuffer;
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a->circularBuffer = nullptr ;
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delete static_cast<std::chrono::time_point<std::chrono::high_resolution_clock>*>(a->startTime);
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a->startTime = nullptr;
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a->flushed = 1;
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if (!download_complete) {
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if (a->file) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "closing audio cache file %s because download was interrupted\n", a->cache_filename);
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if (fclose(a->file) != 0) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "error closing audio cache file\n");
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}
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a->file = nullptr ;
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}
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if (a->cache_filename) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "removing audio cache file %s because download was interrupted\n", a->cache_filename);
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if (unlink(a->cache_filename) != 0) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "cleanupConn: error removing audio cache file %s: %d:%s\n",
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a->cache_filename, errno, strerror(errno));
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}
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free(a->cache_filename);
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a->cache_filename = nullptr ;
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}
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}
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if (a->session_id) {
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switch_core_session_t* session = switch_core_session_locate(a->session_id);
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if (session) {
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switch_channel_t *channel = switch_core_session_get_channel(session);
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if (channel) {
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switch_event_t *event;
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if (switch_event_create(&event, SWITCH_EVENT_PLAYBACK_STOP) == SWITCH_STATUS_SUCCESS) {
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Playback-File-Type", "tts_stream");
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_azure_response_code", std::to_string(a->response_code).c_str());
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if (a->cache_filename && download_complete) {
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_cache_filename", a->cache_filename);
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}
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if (!download_complete && a->err_msg) {
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "variable_tts_error", a->err_msg);
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}
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switch_event_fire(&event);
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}
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else {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "write_cb: failed to create event\n");
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}
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}
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else {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "write_cb: channel not found\n");
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}
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switch_core_session_rwunlock(session);
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}
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}
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_close(azure_t* a) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "azure_speech_close\n") ;
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if (a->resampler) {
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speex_resampler_destroy(a->resampler);
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}
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a->resampler = NULL;
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return SWITCH_STATUS_SUCCESS;
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}
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switch_status_t azure_speech_unload() {
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return SWITCH_STATUS_SUCCESS;
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}
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}
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