mirror of
https://github.com/jambonz/freeswitch-modules.git
synced 2025-12-19 08:37:44 +00:00
241 lines
9.1 KiB
C
241 lines
9.1 KiB
C
/*
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*
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* mod_aws_transcribe.c -- Freeswitch module for using aws streaming transcribe api
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*
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*/
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#include "mod_aws_transcribe.h"
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#include "aws_transcribe_glue.h"
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/* Prototypes */
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SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_aws_transcribe_shutdown);
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SWITCH_MODULE_LOAD_FUNCTION(mod_aws_transcribe_load);
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SWITCH_MODULE_DEFINITION(mod_aws_transcribe, mod_aws_transcribe_load, mod_aws_transcribe_shutdown, NULL);
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static switch_status_t do_stop(switch_core_session_t *session, char* bugname);
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static void responseHandler(switch_core_session_t* session, const char * json, const char* bugname) {
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switch_event_t *event;
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switch_channel_t *channel = switch_core_session_get_channel(session);
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if (0 == strcmp("vad_detected", json)) {
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_VAD_DETECTED);
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "transcription-vendor", "aws");
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}
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else if (0 == strcmp("end_of_transcript", json)) {
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_END_OF_TRANSCRIPT);
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "transcription-vendor", "aws");
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}
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else if (0 == strcmp("max_duration_exceeded", json)) {
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_MAX_DURATION_EXCEEDED);
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "transcription-vendor", "aws");
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}
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else if (0 == strcmp("no_audio", json)) {
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_NO_AUDIO_DETECTED);
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "transcription-vendor", "aws");
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}
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else {
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int error = 0;
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cJSON* jMessage = cJSON_Parse(json);
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if (jMessage) {
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const char* type = cJSON_GetStringValue(cJSON_GetObjectItem(jMessage, "type"));
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if (type && 0 == strcmp(type, "error")) {
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error = 1;
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_ERROR);
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}
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cJSON_Delete(jMessage);
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}
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if (!error) {
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switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, TRANSCRIBE_EVENT_RESULTS);
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}
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "json payload: %s.\n", json);
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switch_channel_event_set_data(channel, event);
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switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "transcription-vendor", "aws");
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switch_event_add_body(event, "%s", json);
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}
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if (bugname) switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "media-bugname", bugname);
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switch_event_fire(&event);
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}
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static switch_bool_t capture_callback(switch_media_bug_t *bug, void *user_data, switch_abc_type_t type)
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{
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switch_core_session_t *session = switch_core_media_bug_get_session(bug);
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switch (type) {
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case SWITCH_ABC_TYPE_INIT:
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Got SWITCH_ABC_TYPE_INIT.\n");
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break;
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case SWITCH_ABC_TYPE_CLOSE:
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{
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struct cap_cb* cb = (struct cap_cb*) switch_core_media_bug_get_user_data(bug);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Got SWITCH_ABC_TYPE_CLOSE.\n");
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aws_transcribe_session_stop(session, 1, cb->bugname);
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//switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Finished SWITCH_ABC_TYPE_CLOSE.\n");
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}
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break;
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case SWITCH_ABC_TYPE_READ:
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return aws_transcribe_frame(bug, user_data);
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break;
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case SWITCH_ABC_TYPE_WRITE:
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default:
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break;
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}
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return SWITCH_TRUE;
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}
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static switch_status_t start_capture(switch_core_session_t *session, switch_media_bug_flag_t flags,
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char* lang, int interim, char* bugname)
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{
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switch_channel_t *channel = switch_core_session_get_channel(session);
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switch_media_bug_t *bug;
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switch_status_t status;
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switch_codec_implementation_t read_impl = { 0 };
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void *pUserData;
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uint32_t samples_per_second;
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if (switch_channel_get_private(channel, bugname)) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "removing bug from previous transcribe\n");
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do_stop(session, bugname);
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}
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switch_core_session_get_read_impl(session, &read_impl);
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if (switch_channel_pre_answer(channel) != SWITCH_STATUS_SUCCESS) {
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return SWITCH_STATUS_FALSE;
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}
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samples_per_second = !strcasecmp(read_impl.iananame, "g722") ? read_impl.actual_samples_per_second : read_impl.samples_per_second;
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if (SWITCH_STATUS_FALSE == aws_transcribe_session_init(session, responseHandler, samples_per_second, flags & SMBF_STEREO ? 2 : 1, lang, interim, bugname, &pUserData)) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Error initializing aws speech session.\n");
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return SWITCH_STATUS_FALSE;
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}
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if ((status = switch_core_media_bug_add(session, bugname, NULL, capture_callback, pUserData, 0, flags, &bug)) != SWITCH_STATUS_SUCCESS) {
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return status;
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}
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switch_channel_set_private(channel, bugname, bug);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "added media bug for aws transcribe\n");
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t do_stop(switch_core_session_t *session, char* bugname)
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{
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switch_status_t status = SWITCH_STATUS_SUCCESS;
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switch_channel_t *channel = switch_core_session_get_channel(session);
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switch_media_bug_t *bug = switch_channel_get_private(channel, bugname);
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if (bug) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Received user command command to stop transcribe on %s.\n", bugname);
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status = aws_transcribe_session_stop(session, 0, bugname);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "stopped transcribe.\n");
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}
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return status;
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}
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#define TRANSCRIBE_API_SYNTAX "<uuid> [start|stop] lang-code [interim] [stereo|mono] [bugname]"
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SWITCH_STANDARD_API(aws_transcribe_function)
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{
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char *mycmd = NULL, *argv[6] = { 0 };
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int argc = 0;
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switch_status_t status = SWITCH_STATUS_FALSE;
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switch_media_bug_flag_t flags = SMBF_READ_STREAM /* | SMBF_WRITE_STREAM | SMBF_READ_PING */;
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if (!zstr(cmd) && (mycmd = strdup(cmd))) {
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argc = switch_separate_string(mycmd, ' ', argv, (sizeof(argv) / sizeof(argv[0])));
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}
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if (zstr(cmd) ||
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(!strcasecmp(argv[1], "stop") && argc < 2) ||
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(!strcasecmp(argv[1], "start") && argc < 3) ||
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zstr(argv[0])) {
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switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Error with command %s %s %s.\n", cmd, argv[0], argv[1]);
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stream->write_function(stream, "-USAGE: %s\n", TRANSCRIBE_API_SYNTAX);
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goto done;
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} else {
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switch_core_session_t *lsession = NULL;
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if ((lsession = switch_core_session_locate(argv[0]))) {
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if (!strcasecmp(argv[1], "stop")) {
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char *bugname = argc > 2 ? argv[2] : MY_BUG_NAME;
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switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "stop transcribing\n");
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status = do_stop(lsession, bugname);
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} else if (!strcasecmp(argv[1], "start")) {
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char* lang = argv[2];
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int interim = argc > 3 && !strcmp(argv[3], "interim");
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char *bugname = argc > 5 ? argv[5] : MY_BUG_NAME;
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if (argc > 4 && !strcmp(argv[4], "stereo")) {
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flags |= SMBF_WRITE_STREAM ;
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flags |= SMBF_STEREO;
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}
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switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "start transcribing %s %s %s\n", lang, interim ? "interim": "complete", bugname);
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status = start_capture(lsession, flags, lang, interim, bugname);
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}
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switch_core_session_rwunlock(lsession);
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}
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}
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if (status == SWITCH_STATUS_SUCCESS) {
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stream->write_function(stream, "+OK Success\n");
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} else {
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stream->write_function(stream, "-ERR Operation Failed\n");
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}
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done:
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switch_safe_free(mycmd);
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return SWITCH_STATUS_SUCCESS;
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}
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SWITCH_MODULE_LOAD_FUNCTION(mod_aws_transcribe_load)
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{
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switch_api_interface_t *api_interface;
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/* create/register custom event message type */
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if (switch_event_reserve_subclass(TRANSCRIBE_EVENT_RESULTS) != SWITCH_STATUS_SUCCESS) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Couldn't register subclass %s!\n", TRANSCRIBE_EVENT_RESULTS);
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return SWITCH_STATUS_TERM;
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}
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/* connect my internal structure to the blank pointer passed to me */
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*module_interface = switch_loadable_module_create_module_interface(pool, modname);
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "AWS Speech Transcription API loading..\n");
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if (SWITCH_STATUS_FALSE == aws_transcribe_init()) {
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Failed initializing aws speech interface\n");
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}
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "AWS Speech Transcription API successfully loaded\n");
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SWITCH_ADD_API(api_interface, "uuid_aws_transcribe", "AWS Speech Transcription API", aws_transcribe_function, TRANSCRIBE_API_SYNTAX);
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switch_console_set_complete("add uuid_aws_transcribe start lang-code [interim|final] [stereo|mono]");
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switch_console_set_complete("add uuid_aws_transcribe stop ");
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/* indicate that the module should continue to be loaded */
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return SWITCH_STATUS_SUCCESS;
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}
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/*
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Called when the system shuts down
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Macro expands to: switch_status_t mod_aws_transcribe_shutdown() */
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SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_aws_transcribe_shutdown)
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{
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aws_transcribe_cleanup();
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switch_event_free_subclass(TRANSCRIBE_EVENT_RESULTS);
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return SWITCH_STATUS_SUCCESS;
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}
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