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freeswitch-modules/mod_deepgram_transcribe/dg_transcribe_glue.cpp
Hoan Luu Huu 33750b5420 mod_deepgram_transcribe keep alive connection (#56) 
* mod_deepgram_transcribe keep alive connection

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* wip

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* wip

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* wip

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* wip

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* read use single connection configuration from env var

* remove deepgram media bug buffered data

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

* fix review comments

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>

---------

Signed-off-by: Hoan HL <quan.luuhoang8@gmail.com>
2024-04-30 08:00:59 -04:00

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#include <switch.h>
#include <switch_json.h>
#include <string.h>
#include <string>
#include <mutex>
#include <thread>
#include <list>
#include <algorithm>
#include <functional>
#include <cassert>
#include <cstdlib>
#include <fstream>
#include <sstream>
#include <regex>
#include <iostream>
#include <unordered_map>
#include "mod_deepgram_transcribe.h"
#include "simple_buffer.h"
#include "parser.hpp"
#include "audio_pipe.hpp"
#define RTP_PACKETIZATION_PERIOD 20
#define FRAME_SIZE_8000 320 /*which means each 20ms frame as 320 bytes at 8 khz (1 channel only)*/
#define DEEPGRAM_KEEP_ALIVE_INTERVAL_SECOND 8
namespace {
static bool hasDefaultCredentials = false;
static const char* defaultApiKey = nullptr;
static const char *requestedBufferSecs = std::getenv("MOD_AUDIO_FORK_BUFFER_SECS");
static int nAudioBufferSecs = std::max(1, std::min(requestedBufferSecs ? ::atoi(requestedBufferSecs) : 2, 5));
static const char *requestedNumServiceThreads = std::getenv("MOD_AUDIO_FORK_SERVICE_THREADS");
static unsigned int idxCallCount = 0;
static uint32_t playCount = 0;
/* deepgram model defaults by language */
static const std::unordered_map<std::string, std::string> languageLookupTable = {
{"zh", "base"},
{"zh-CN", "base"},
{"zh-TW", "base"},
{"da", "nova-2"},
{"da-DK", "nova-2"},
{"en", "nova-2"},
{"en-US", "nova-2"},
{"en-AU", "nova-2"},
{"en-GB", "nova-2"},
{"en-IN", "nova-2"},
{"en-NZ", "nova-2"},
{"nl", "nova-2"},
{"nl-BE", "nova-2"},
{"fr", "nova-2"},
{"fr-CA", "nova-2"},
{"de", "nova-2"},
{"el", "nova-2"},
{"hi", "nova-2"},
{"hi-Latn", "nova-2"},
{"id", "nova-2"},
{"it", "nova-2"},
{"ja", "enhanced"},
{"ko", "nova-2"},
{"ko-KR", "nova-2"},
{"no", "nova-2"},
{"pl", "nova-2"},
{"pt","nova-2"},
{"pt-BR", "nova-2"},
{"ru", "nova-2"},
{"es","nova-2"},
{"es-419","nova-2"},
{"es-LATAM","enhanced"},
{"sv", "nova-2"},
{"sv-SE", "nova-2"},
{"ta", "enhanced"},
{"taq", "enhanced"},
{"tr", "nova-2"},
{"uk", "nova-2"}
};
static bool getLanguageInfo(const std::string& language, std::string& model) {
auto it = languageLookupTable.find(language);
if (it != languageLookupTable.end()) {
model = it->second;
return true;
}
return false;
}
static const char* emptyTranscript =
"\"is_final\":false,\"speech_final\":false,\"channel\":{\"alternatives\":[{\"transcript\":\"\",\"confidence\":0.0,\"words\":[]}]}";
static void reaper(private_t *tech_pvt, bool silence_disconnect) {
std::shared_ptr<deepgram::AudioPipe> pAp;
pAp.reset((deepgram::AudioPipe *)tech_pvt->pAudioPipe);
tech_pvt->pAudioPipe = nullptr;
std::thread t([pAp, tech_pvt, silence_disconnect]{
if (silence_disconnect) {
pAp->finish_in_silence();
} else {
pAp->finish();
}
pAp->waitForClose();
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "%s (%u) got remote close\n", tech_pvt->sessionId, tech_pvt->id);
});
t.detach();
}
static void destroy_tech_pvt(private_t *tech_pvt) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "%s (%u) destroy_tech_pvt\n", tech_pvt->sessionId, tech_pvt->id);
if (tech_pvt) {
if (tech_pvt->pAudioPipe) {
deepgram::AudioPipe* p = (deepgram::AudioPipe *) tech_pvt->pAudioPipe;
delete p;
tech_pvt->pAudioPipe = nullptr;
}
if (tech_pvt->resampler) {
speex_resampler_destroy(tech_pvt->resampler);
tech_pvt->resampler = NULL;
}
// NB: do not destroy the mutex here, that is caller responsibility
/*
if (tech_pvt->vad) {
switch_vad_destroy(&tech_pvt->vad);
tech_pvt->vad = nullptr;
}
*/
}
}
std::string encodeURIComponent(std::string decoded)
{
std::ostringstream oss;
std::regex r("[!'\\(\\)*-.0-9A-Za-z_~:]");
for (char &c : decoded)
{
if (std::regex_match((std::string){c}, r))
{
oss << c;
}
else
{
oss << "%" << std::uppercase << std::hex << (0xff & c);
}
}
return oss.str();
}
std::string& constructPath(switch_core_session_t* session, std::string& path,
int sampleRate, int channels, const char* language, int interim) {
switch_channel_t *channel = switch_core_session_get_channel(session);
const char *var ;
const char *model = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_MODEL");
const char *customModel = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_CUSTOM_MODEL");
std::ostringstream oss;
oss << "/v1/listen?";
/* make best choice by language if model not supplied*/
if (!model && !customModel) {
std::string defaultModel;
if (getLanguageInfo(language, defaultModel)) {
oss << "&model=" << defaultModel;
}
else {
oss << "model=base"; // most widely supported, though not ideal
}
}
else if (model) oss << "&model=" << model;
else if (customModel) oss << "&model=" << customModel;
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_MODEL_VERSION")) {
oss << "&version";
oss << var;
}
oss << "&language=";
oss << language;
if (channels == 2) {
oss << "&multichannel=true";
oss << "&channels=2";
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_ENABLE_SMART_FORMAT")) {
oss << "&smart_format=true";
oss << "&no_delay=true";
/**
* see: https://github.com/orgs/deepgram/discussions/384
*
*/
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_ENABLE_FILLER_WORDS")) {
oss << "&filler_words=true";
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_ENABLE_AUTOMATIC_PUNCTUATION")) {
oss << "&punctuate=true";
}
if (switch_true(switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_PROFANITY_FILTER"))) {
oss << "&profanity_filter=true";
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_REDACT")) {
oss << "&redact=";
oss << var;
}
if (switch_true(switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_DIARIZE"))) {
oss << "&diarize=true";
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_DIARIZE_VERSION")) {
oss << "&diarize_version=";
oss << var;
}
}
if (switch_true(switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_NER"))) {
oss << "&ner=true";
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_ALTERNATIVES")) {
oss << "&alternatives=";
oss << var;
}
if (switch_true(switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_NUMERALS"))) {
oss << "&numerals=true";
}
const char* hints = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_SEARCH");
if (hints) {
char *phrases[500] = { 0 };
int argc = switch_separate_string((char *)hints, ',', phrases, 500);
for (int i = 0; i < argc; i++) {
oss << "&search=";
oss << encodeURIComponent(phrases[i]);
}
}
const char* keywords = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_KEYWORDS");
if (keywords) {
char *phrases[500] = { 0 };
int argc = switch_separate_string((char *)keywords, ',', phrases, 500);
for (int i = 0; i < argc; i++) {
oss << "&keywords=";
oss << encodeURIComponent(phrases[i]);
}
}
const char* replace = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_REPLACE");
if (replace) {
char *phrases[500] = { 0 };
int argc = switch_separate_string((char *)replace, ',', phrases, 500);
for (int i = 0; i < argc; i++) {
oss << "&replace=";
oss << encodeURIComponent(phrases[i]);
}
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_TAG")) {
oss << "&tag=";
oss << var;
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_ENDPOINTING")) {
oss << "&endpointing=";
oss << var;
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_UTTERANCE_END_MS")) {
oss << "&utterance_end_ms=";
oss << var;
interim = 1;
//this requires interim_results=true (https://developers.deepgram.com/docs/understanding-end-of-speech-detection)
}
if (interim) {
oss << "&interim_results=true";
}
if (var = switch_channel_get_variable(channel, "DEEPGRAM_SPEECH_VAD_TURNOFF")) {
oss << "&vad_turnoff=";
oss << var;
}
oss << "&encoding=linear16";
oss << "&sample_rate=8000";
path = oss.str();
return path;
}
static void eventCallback(const char* sessionId, const char* bugname,
deepgram::AudioPipe::NotifyEvent_t event, const char* message, bool finished) {
switch_core_session_t* session = switch_core_session_locate(sessionId);
if (session) {
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_media_bug_t *bug = (switch_media_bug_t*) switch_channel_get_private(channel, bugname);
if (bug) {
private_t* tech_pvt = (private_t*) switch_core_media_bug_get_user_data(bug);
if (tech_pvt) {
switch (event) {
case deepgram::AudioPipe::CONNECT_SUCCESS:
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "connection (%s) successful\n", tech_pvt->bugname);
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_CONNECT_SUCCESS, NULL, tech_pvt->bugname, finished);
break;
case deepgram::AudioPipe::CONNECT_FAIL:
{
// first thing: we can no longer access the AudioPipe
std::stringstream json;
json << "{\"reason\":\"" << message << "\"}";
tech_pvt->pAudioPipe = nullptr;
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_CONNECT_FAIL, (char *) json.str().c_str(), tech_pvt->bugname, finished);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_NOTICE, "connection (%s) failed: %s\n", message, tech_pvt->bugname);
}
break;
case deepgram::AudioPipe::CONNECTION_DROPPED:
// first thing: we can no longer access the AudioPipe
/**
* this is a bit tricky. If we just closed a previos connection it may be returning final transcripts
* and then a close event here as it is shutting down (in the reaper thread above).
* In this scenario, the fact that the connection is dropped is not significant.
*/
if (finished) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "old connection (%s) gracefully closed by Deepgram\n", tech_pvt->bugname);
}
else {
tech_pvt->pAudioPipe = nullptr;
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_DISCONNECT, NULL, tech_pvt->bugname, finished);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "connection (%s) dropped from far end\n", tech_pvt->bugname);
}
break;
case deepgram::AudioPipe::CONNECTION_CLOSED_GRACEFULLY:
// first thing: we can no longer access the AudioPipe
tech_pvt->pAudioPipe = nullptr;
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "connection (%s) closed gracefully\n", tech_pvt->bugname);
break;
case deepgram::AudioPipe::MESSAGE:
if( strstr(message, emptyTranscript)) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "discarding empty deepgram transcript\n");
}
else {
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_RESULTS, message, tech_pvt->bugname, finished);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "deepgram message (%s): %s\n", tech_pvt->bugname, message);
}
break;
default:
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_NOTICE, "got unexpected msg from deepgram %d:%s\n", event, message);
break;
}
}
}
switch_core_session_rwunlock(session);
}
}
switch_status_t fork_data_init(private_t *tech_pvt, switch_core_session_t *session,
int sampling, int desiredSampling, int channels, char *lang, int interim,
char* bugname, responseHandler_t responseHandler) {
int err;
int useTls = true;
std::string host;
int port = 443;
size_t buflen = LWS_PRE + (FRAME_SIZE_8000 * desiredSampling / 8000 * channels * 1000 / RTP_PACKETIZATION_PERIOD * nAudioBufferSecs);
std::ostringstream configuration_stream;
switch_codec_implementation_t read_impl;
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_core_session_get_read_impl(session, &read_impl);
std::string path;
constructPath(session, path, desiredSampling, channels, lang, interim);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "path: %s\n", path.c_str());
const char* endpoint = switch_channel_get_variable(channel, "DEEPGRAM_URI");
if (endpoint != nullptr) {
std::string ep(endpoint);
useTls = switch_true(switch_channel_get_variable(channel, "DEEPGRAM_USE_TLS"));
size_t pos = ep.find(':');
host = ep;
if (pos != std::string::npos) {
host = ep.substr(0, pos);
std::string strPort = ep.substr(pos + 1);
port = ::atoi(strPort.c_str());
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO,
"connecting to deepgram on-prem %s port %d, using tls? (%s)\n", host.c_str(), port, useTls ? "yes" : "no");
} else {
host = "api.deepgram.com";
}
const char* apiKey = switch_channel_get_variable(channel, "DEEPGRAM_API_KEY");
if (!apiKey && defaultApiKey) {
apiKey = defaultApiKey;
} else if (!apiKey && endpoint == nullptr) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "no deepgram api key provided\n");
return SWITCH_STATUS_FALSE;
}
configuration_stream <<
host << ":" <<
port << ";" <<
path << ";" <<
buflen << ";" <<
read_impl.decoded_bytes_per_packet << ";" <<
apiKey << ";" <<
useTls;
if (tech_pvt->pAudioPipe) {
// stop sending keep alive
tech_pvt->is_keep_alive = 0;
if (0 != strcmp(tech_pvt->configuration, configuration_stream.str().c_str())) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "fork_data_init: stop existing deepgram connection, old configuration %s, new configuration %s\n",
tech_pvt->configuration, configuration_stream.str().c_str());
reaper(tech_pvt, true);
} else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "fork_data_init: enable existing deepgram connection\n");
return SWITCH_STATUS_SUCCESS;
}
} else {
memset(tech_pvt, 0, sizeof(private_t));
}
strncpy(tech_pvt->sessionId, switch_core_session_get_uuid(session), MAX_SESSION_ID);
strncpy(tech_pvt->host, host.c_str(), MAX_WS_URL_LEN);
tech_pvt->port = port;
strncpy(tech_pvt->path, path.c_str(), MAX_PATH_LEN);
strncpy(tech_pvt->configuration, configuration_stream.str().c_str(), MAX_PATH_LEN) ;
tech_pvt->sampling = desiredSampling;
tech_pvt->responseHandler = responseHandler;
tech_pvt->channels = channels;
tech_pvt->id = ++idxCallCount;
tech_pvt->buffer_overrun_notified = 0;
tech_pvt->is_keep_alive = 0;
strncpy(tech_pvt->bugname, bugname, MAX_BUG_LEN);
deepgram::AudioPipe* ap = new deepgram::AudioPipe(tech_pvt->sessionId, bugname, tech_pvt->host, tech_pvt->port, tech_pvt->path,
buflen, read_impl.decoded_bytes_per_packet, apiKey, useTls, eventCallback);
if (!ap) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error allocating AudioPipe\n");
return SWITCH_STATUS_FALSE;
}
tech_pvt->pAudioPipe = static_cast<void *>(ap);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "connecting now\n");
ap->connect();
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "connection in progress\n");
if (!tech_pvt->mutex) {
switch_mutex_init(&tech_pvt->mutex, SWITCH_MUTEX_NESTED, switch_core_session_get_pool(session));
}
if (!tech_pvt->resampler) {
if (desiredSampling != sampling) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "(%u) resampling from %u to %u\n", tech_pvt->id, sampling, desiredSampling);
tech_pvt->resampler = speex_resampler_init(channels, sampling, desiredSampling, SWITCH_RESAMPLE_QUALITY, &err);
if (0 != err) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error initializing resampler: %s.\n", speex_resampler_strerror(err));
return SWITCH_STATUS_FALSE;
}
}
else {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "(%u) no resampling needed for this call\n", tech_pvt->id);
}
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "(%u) fork_data_init\n", tech_pvt->id);
return SWITCH_STATUS_SUCCESS;
}
void lws_logger(int level, const char *line) {
switch_log_level_t llevel = SWITCH_LOG_DEBUG;
switch (level) {
case LLL_ERR: llevel = SWITCH_LOG_ERROR; break;
case LLL_WARN: llevel = SWITCH_LOG_WARNING; break;
case LLL_NOTICE: llevel = SWITCH_LOG_NOTICE; break;
case LLL_INFO: llevel = SWITCH_LOG_INFO; break;
break;
}
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "%s\n", line);
}
}
extern "C" {
switch_status_t dg_transcribe_init() {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "mod_deepgram_transcribe: audio buffer (in secs): %d secs\n", nAudioBufferSecs);
int logs = LLL_ERR | LLL_WARN | LLL_NOTICE;
// | LLL_INFO | LLL_PARSER | LLL_HEADER | LLL_EXT | LLL_CLIENT | LLL_LATENCY | LLL_DEBUG ;
deepgram::AudioPipe::initialize(logs, lws_logger);
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "AudioPipe::initialize completed\n");
const char* apiKey = std::getenv("DEEPGRAM_API_KEY");
if (NULL == apiKey) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE,
"\"DEEPGRAM_API_KEY\" env var not set; authentication will expect channel variables of same names to be set\n");
}
else {
hasDefaultCredentials = true;
defaultApiKey = apiKey;
}
return SWITCH_STATUS_SUCCESS;
}
switch_status_t dg_transcribe_cleanup() {
bool cleanup = false;
cleanup = deepgram::AudioPipe::deinitialize();
if (cleanup == true) {
return SWITCH_STATUS_SUCCESS;
}
return SWITCH_STATUS_FALSE;
}
switch_status_t dg_transcribe_session_init(switch_core_session_t *session,
responseHandler_t responseHandler, uint32_t samples_per_second, uint32_t channels,
char* lang, int interim, char* bugname, void **ppUserData)
{
int err;
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_media_bug_t *bug = (switch_media_bug_t*) switch_channel_get_private(channel, bugname);
private_t* tech_pvt;
if (bug) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "reuse existing kep alive deepgram connection\n");
tech_pvt = (private_t*) switch_core_media_bug_get_user_data(bug);
} else {
tech_pvt = (private_t *) switch_core_session_alloc(session, sizeof(private_t));
tech_pvt->pAudioPipe = NULL;
tech_pvt->is_keep_alive = 0;
tech_pvt->mutex = NULL;
tech_pvt->resampler = NULL;
}
if (!tech_pvt) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "error allocating memory!\n");
return SWITCH_STATUS_FALSE;
}
if (SWITCH_STATUS_SUCCESS != fork_data_init(tech_pvt, session, samples_per_second, 8000, channels, lang, interim, bugname, responseHandler)) {
destroy_tech_pvt(tech_pvt);
return SWITCH_STATUS_FALSE;
}
*ppUserData = tech_pvt;
return SWITCH_STATUS_SUCCESS;
}
switch_status_t dg_transcribe_session_stop(switch_core_session_t *session,int channelIsClosing, char* bugname) {
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_media_bug_t *bug = (switch_media_bug_t*) switch_channel_get_private(channel, bugname);
const bool use_single_connection = switch_true(std::getenv("DEEPGRAM_SPEECH_USE_SINGLE_CONNECTION"));
if (!bug) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "dg_transcribe_session_stop: no bug - websocket conection already closed\n");
return SWITCH_STATUS_FALSE;
}
private_t* tech_pvt = (private_t*) switch_core_media_bug_get_user_data(bug);
uint32_t id = tech_pvt->id;
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "(%u) dg_transcribe_session_stop\n", id);
if (!tech_pvt) return SWITCH_STATUS_FALSE;
if (use_single_connection && !channelIsClosing) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "dg_transcribe_session_stop: call is running, use_single_connection is true, keep alive is activated\n", id);
tech_pvt->is_keep_alive = 1;
tech_pvt->frame_count = 0;
return SWITCH_STATUS_SUCCESS;
}
// close connection and get final responses
switch_mutex_lock(tech_pvt->mutex);
switch_channel_set_private(channel, bugname, NULL);
if (!channelIsClosing) switch_core_media_bug_remove(session, &bug);
deepgram::AudioPipe *pAudioPipe = static_cast<deepgram::AudioPipe *>(tech_pvt->pAudioPipe);
if (pAudioPipe) reaper(tech_pvt, false);
destroy_tech_pvt(tech_pvt);
switch_mutex_unlock(tech_pvt->mutex);
switch_mutex_destroy(tech_pvt->mutex);
tech_pvt->mutex = nullptr;
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "(%u) dg_transcribe_session_stop\n", id);
return SWITCH_STATUS_SUCCESS;
}
switch_bool_t dg_transcribe_frame(switch_core_session_t *session, switch_media_bug_t *bug) {
private_t* tech_pvt = (private_t*) switch_core_media_bug_get_user_data(bug);
size_t inuse = 0;
bool dirty = false;
char *p = (char *) "{\"msg\": \"buffer overrun\"}";
char *keep_alive = (char *) "{\"type\": \"KeepAlive\"}";
if (!tech_pvt) return SWITCH_TRUE;
// Keep sending keep alive if there is no transcribe activity
if (tech_pvt->is_keep_alive && tech_pvt->pAudioPipe) {
deepgram::AudioPipe *pAudioPipe = static_cast<deepgram::AudioPipe *>(tech_pvt->pAudioPipe);
if (++tech_pvt->frame_count * 20 /*ms*/ / 1000 >= DEEPGRAM_KEEP_ALIVE_INTERVAL_SECOND) {
tech_pvt->frame_count = 0;
pAudioPipe->bufferForSending(keep_alive);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "dg_transcribe_frame: sending %s to deepgram\n", keep_alive);
}
// remove media bug buffered data
while (true) {
unsigned char data[SWITCH_RECOMMENDED_BUFFER_SIZE] = {0};
switch_frame_t frame = { 0 };
frame.data = data;
frame.buflen = SWITCH_RECOMMENDED_BUFFER_SIZE;
switch_status_t rv = switch_core_media_bug_read(bug, &frame, SWITCH_TRUE);
if (rv != SWITCH_STATUS_SUCCESS) break;
}
return SWITCH_TRUE;
}
if (switch_mutex_trylock(tech_pvt->mutex) == SWITCH_STATUS_SUCCESS) {
if (!tech_pvt->pAudioPipe) {
switch_mutex_unlock(tech_pvt->mutex);
return SWITCH_TRUE;
}
deepgram::AudioPipe *pAudioPipe = static_cast<deepgram::AudioPipe *>(tech_pvt->pAudioPipe);
if (pAudioPipe->getLwsState() != deepgram::AudioPipe::LWS_CLIENT_CONNECTED) {
switch_mutex_unlock(tech_pvt->mutex);
return SWITCH_TRUE;
}
pAudioPipe->lockAudioBuffer();
size_t available = pAudioPipe->binarySpaceAvailable();
if (NULL == tech_pvt->resampler) {
switch_frame_t frame = { 0 };
frame.data = pAudioPipe->binaryWritePtr();
frame.buflen = available;
while (true) {
// check if buffer would be overwritten; dump packets if so
if (available < pAudioPipe->binaryMinSpace()) {
if (!tech_pvt->buffer_overrun_notified) {
tech_pvt->buffer_overrun_notified = 1;
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_BUFFER_OVERRUN, NULL, tech_pvt->bugname, 0);
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "(%u) dropping packets!\n",
tech_pvt->id);
pAudioPipe->binaryWritePtrResetToZero();
frame.data = pAudioPipe->binaryWritePtr();
frame.buflen = available = pAudioPipe->binarySpaceAvailable();
}
switch_status_t rv = switch_core_media_bug_read(bug, &frame, SWITCH_TRUE);
if (rv != SWITCH_STATUS_SUCCESS) break;
if (frame.datalen) {
pAudioPipe->binaryWritePtrAdd(frame.datalen);
frame.buflen = available = pAudioPipe->binarySpaceAvailable();
frame.data = pAudioPipe->binaryWritePtr();
dirty = true;
}
}
}
else {
uint8_t data[SWITCH_RECOMMENDED_BUFFER_SIZE];
switch_frame_t frame = { 0 };
frame.data = data;
frame.buflen = SWITCH_RECOMMENDED_BUFFER_SIZE;
while (switch_core_media_bug_read(bug, &frame, SWITCH_TRUE) == SWITCH_STATUS_SUCCESS) {
if (frame.datalen) {
spx_uint32_t out_len = available >> 1; // space for samples which are 2 bytes
spx_uint32_t in_len = frame.samples;
speex_resampler_process_interleaved_int(tech_pvt->resampler,
(const spx_int16_t *) frame.data,
(spx_uint32_t *) &in_len,
(spx_int16_t *) ((char *) pAudioPipe->binaryWritePtr()),
&out_len);
if (out_len > 0) {
// bytes written = num samples * 2 * num channels
size_t bytes_written = out_len << tech_pvt->channels;
pAudioPipe->binaryWritePtrAdd(bytes_written);
available = pAudioPipe->binarySpaceAvailable();
dirty = true;
}
if (available < pAudioPipe->binaryMinSpace()) {
if (!tech_pvt->buffer_overrun_notified) {
tech_pvt->buffer_overrun_notified = 1;
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "(%u) dropping packets!\n",
tech_pvt->id);
tech_pvt->responseHandler(session, TRANSCRIBE_EVENT_BUFFER_OVERRUN, NULL, tech_pvt->bugname, 0);
}
break;
}
}
}
}
pAudioPipe->unlockAudioBuffer();
switch_mutex_unlock(tech_pvt->mutex);
}
return SWITCH_TRUE;
}
}
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