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asyncapi.json
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{
"asyncapi": "2.6.0",
"defaultContentType": "application/json",
"id": "http://assemblyai.com/asyncapi",
"info": {
"title": "AssemblyAI Streaming Speech-to-Text API",
"description": "AssemblyAI Streaming Speech-to-Text API",
"license": {
"name": "MIT License"
},
"version": "1.1.2",
"contact": {
"name": "API Support",
"email": "[email protected]",
"url": "https://www.assemblyai.com/docs/"
}
},
"servers": {
"API": {
"url": "wss://api.assemblyai.com",
"protocol": "wss",
"description": "AssemblyAI API",
"security": [
{
"ApiKey": []
},
{
"Token": []
}
]
}
},
"tags": [
{
"name": "realtime",
"description": "Streaming Speech-to-Text",
"externalDocs": {
"url": "https://www.assemblyai.com/docs/speech-to-text/streaming"
}
}
],
"channels": {
"/v2/realtime/ws": {
"bindings": {
"ws": {
"headers": {
"type": "object",
"properties": {
"Authentication": {
"description": "Authenticate using your AssemblyAI API key",
"type": "string"
}
}
},
"query": {
"type": "object",
"properties": {
"sample_rate": {
"description": "The sample rate of the streamed audio",
"type": "integer",
"examples": [16000]
},
"word_boost": {
"description": "Add up to 2500 characters of custom vocabulary.\nThe parameter value must be a JSON encoded array of strings.\n",
"type": "string",
"examples": ["[\"foo\",\"bar\"]"]
},
"encoding": {
"description": "The encoding of the audio data",
"$ref": "#/components/schemas/AudioEncoding"
},
"token": {
"description": "Authenticate using a [generated temporary token](https://www.assemblyai.com/docs/speech-to-text/streaming#authenticate-with-a-temporary-token)\n",
"type": "string",
"format": "password",
"examples": ["eyJhbGciOiJIUzI1..."]
},
"disable_partial_transcripts": {
"summary": "Disable partial transcripts",
"description": "Set to true to not receive partial transcripts. Defaults to false.",
"type": "boolean",
"default": false
},
"enable_extra_session_information": {
"summary": "Enable extra session information",
"description": "Set to true to receive the SessionInformation message before the session ends. Defaults to false.",
"type": "boolean",
"default": false
}
}
}
}
},
"publish": {
"description": "Send messages to the WebSocket",
"operationId": "sendMessage",
"message": {
"oneOf": [
{
"$ref": "#/components/messages/SendAudio"
},
{
"$ref": "#/components/messages/TerminateSession"
},
{
"$ref": "#/components/messages/ForceEndUtterance"
},
{
"$ref": "#/components/messages/ConfigureEndUtteranceSilenceThreshold"
}
]
}
},
"subscribe": {
"description": "Receive messages from the WebSocket",
"operationId": "receiveMessage",
"message": {
"oneOf": [
{
"$ref": "#/components/messages/SessionBegins"
},
{
"$ref": "#/components/messages/PartialTranscript"
},
{
"$ref": "#/components/messages/FinalTranscript"
},
{
"$ref": "#/components/messages/SessionInformation"
},
{
"$ref": "#/components/messages/SessionTerminated"
},
{
"$ref": "#/components/messages/RealtimeError"
}
]
}
},
"x-fern-examples": [
{
"query-parameters": {
"sample_rate": 16000,
"word_boost": "[\"foo\",\"bar\"]",
"encoding": "pcm_s16le",
"token": "eyJhbGciOiJIUzI1...",
"disable_partial_transcripts": true,
"enable_extra_session_information": true
},
"messages": [
{
"messageId": "SendAudio",
"type": "publish",
"value": "UklGRtjIAABXQVZFZ"
},
{
"messageId": "PartialTranscript",
"type": "subscribe",
"value": {
"audio_start": 0,
"audio_end": 1500,
"confidence": 0.987190506414702,
"text": "there is a house in new orleans",
"words": [
{
"start": 0,
"end": 300,
"confidence": 1,
"text": "there"
}
],
"created": "2023-05-24T08:09:10.161850"
}
},
{
"messageId": "FinalTranscript",
"type": "subscribe",
"value": {
"audio_start": 0,
"audio_end": 1500,
"confidence": 0.987190506414702,
"text": "there is a house in new orleans",
"words": [
{
"start": 0,
"end": 300,
"confidence": 1,
"text": "there"
}
],
"created": "2023-05-24T08:09:10.161850",
"punctuated": true,
"text_formatted": true
}
},
{
"messageId": "TerminateSession",
"type": "publish",
"value": {
"terminate_session": true
}
},
{
"messageId": "SessionTerminated",
"type": "subscribe",
"value": {
"message_type": "SessionTerminated"
}
}
]
}
]
}
},
"components": {
"messages": {
"SendAudio": {
"messageId": "sendAudio",
"summary": "Send audio",
"payload": {
"$ref": "#/components/schemas/AudioData"
}
},
"ForceEndUtterance": {
"messageId": "forceEndUtterance",
"summary": "Manually end an utterance",
"payload": {
"$ref": "#/components/schemas/ForceEndUtterance"
}
},
"ConfigureEndUtteranceSilenceThreshold": {
"messageId": "configureEndUtteranceSilenceThreshold",
"summary": "Configure the threshold for how long to wait before ending an utterance. Default is 700ms.",
"payload": {
"$ref": "#/components/schemas/ConfigureEndUtteranceSilenceThreshold"
}
},
"TerminateSession": {
"messageId": "terminateSession",
"summary": "Terminate session",
"payload": {
"$ref": "#/components/schemas/TerminateSession"
}
},
"SessionBegins": {
"messageId": "SessionBegins",
"summary": "Session start",
"payload": {
"$ref": "#/components/schemas/SessionBegins"
}
},
"SessionInformation": {
"messageId": "SessionInformation",
"summary": "Information about the session",
"description": "Information about the session that is concluding.\nThis message is sent at the end of the session, before the SessionTerminated message.\n",
"payload": {
"$ref": "#/components/schemas/SessionInformation"
}
},
"SessionTerminated": {
"messageId": "SessionTerminated",
"summary": "Session terminated",
"payload": {
"$ref": "#/components/schemas/SessionTerminated"
}
},
"RealtimeError": {
"messageId": "RealtimeError",
"summary": "Error message",
"payload": {
"$ref": "#/components/schemas/RealtimeError"
}
},
"PartialTranscript": {
"messageId": "partialTranscript",
"summary": "As you send audio data to the API, the API immediately starts responding with Partial Transcript results.",
"payload": {
"$ref": "#/components/schemas/PartialTranscript"
}
},
"FinalTranscript": {
"messageId": "finalTranscript",
"summary": "Transcript text at the end of an utterance with punctuation and casing.",
"description": "After you've received your partial results, our model continues to analyze incoming audio and, when it detects the end of an \"utterance\" (usually a pause in speech), it'll finalize the results sent to you so far with higher accuracy, as well as add punctuation and casing to the transcription text.",
"payload": {
"$ref": "#/components/schemas/FinalTranscript"
}
}
},
"schemas": {
"RealtimeBaseMessage": {
"type": "object",
"x-fern-sdk-group-name": "realtime",
"required": ["message_type"],
"properties": {
"message_type": {
"description": "Describes the type of the message",
"$ref": "#/components/schemas/MessageType"
}
}
},
"RealtimeMessage": {
"x-fern-sdk-group-name": "realtime",
"oneOf": [
{
"$ref": "#/components/schemas/SessionBegins"
},
{
"$ref": "#/components/schemas/PartialTranscript"
},
{
"$ref": "#/components/schemas/FinalTranscript"
},
{
"$ref": "#/components/schemas/SessionInformation"
},
{
"$ref": "#/components/schemas/SessionTerminated"
},
{
"$ref": "#/components/schemas/RealtimeError"
}
]
},
"RealtimeError": {
"summary": "Error message",
"type": "object",
"x-fern-sdk-group-name": "realtime",
"additionalProperties": false,
"required": ["error"],
"properties": {
"error": {
"type": "string"
}
},
"examples": [
{
"error": "Client sent audio too fast"
}
]
},
"MessageType": {
"type": "string",
"x-fern-sdk-group-name": "realtime",
"enum": [
"SessionBegins",
"PartialTranscript",
"FinalTranscript",
"SessionInformation",
"SessionTerminated"
]
},
"RealtimeTranscriptType": {
"type": "string",
"x-fern-sdk-group-name": "realtime",
"enum": ["PartialTranscript", "FinalTranscript"]
},
"RealtimeTranscript": {
"x-fern-sdk-group-name": "realtime",
"oneOf": [
{
"$ref": "#/components/schemas/PartialTranscript"
},
{
"$ref": "#/components/schemas/FinalTranscript"
}
],
"discriminator": "message_type"
},
"SessionBegins": {
"summary": "Session start",
"x-fern-sdk-group-name": "realtime",
"allOf": [
{
"$ref": "#/components/schemas/RealtimeBaseMessage"
},
{
"type": "object",
"required": ["message_type", "session_id", "expires_at"],
"properties": {
"message_type": {
"description": "Describes the type of the message",
"type": "string",
"const": "SessionBegins"
},
"session_id": {
"description": "Unique identifier for the established session",
"type": "string",
"format": "uuid"
},
"expires_at": {
"description": "Timestamp when this session will expire",
"type": "string",
"pattern": "^(?:(\\d{4}-\\d{2}-\\d{2})T(\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?))$",
"x-fern-type": "datetime",
"x-ts-type": "Date"
}
},
"additionalProperties": false
}
],
"examples": [
{
"session_id": "f14499a6-c399-4c30-b1eb-0a33af64b1d9",
"expires_at": "2023-11-04T16:51:38.316048",
"message_type": "SessionBegins"
}
]
},
"SessionInformation": {
"summary": "Information about the session",
"description": "Information about the session that is concluding.\nThis message is sent at the end of the session, before the SessionTerminated message.\n",
"x-fern-sdk-group-name": "realtime",
"allOf": [
{
"$ref": "#/components/schemas/RealtimeBaseMessage"
},
{
"type": "object",
"required": ["message_type", "audio_duration_seconds"],
"properties": {
"message_type": {
"description": "Describes the type of the message",
"type": "string",
"const": "SessionInformation"
},
"audio_duration_seconds": {
"description": "The total duration of the audio in seconds",
"type": "number",
"format": "float"
}
},
"additionalProperties": false
}
],
"examples": [
{
"message_type": "SessionInformation",
"audio_duration_seconds": 232.192
}
]
},
"SessionTerminated": {
"summary": "Session terminated",
"x-fern-sdk-group-name": "realtime",
"allOf": [
{
"$ref": "#/components/schemas/RealtimeBaseMessage"
},
{
"type": "object",
"required": ["message_type"],
"properties": {
"message_type": {
"description": "Describes the type of the message",
"type": "string",
"const": "SessionTerminated"
}
},
"additionalProperties": false
}
],
"examples": [
{
"message_type": "SessionTerminated"
}
]
},
"RealtimeBaseTranscript": {
"type": "object",
"x-fern-sdk-group-name": "realtime",
"required": [
"audio_start",
"audio_end",
"confidence",
"text",
"words",
"created"
],
"properties": {
"audio_start": {
"description": "Start time of audio sample relative to session start, in milliseconds",
"type": "integer"
},
"audio_end": {
"description": "End time of audio sample relative to session start, in milliseconds",
"type": "integer"
},
"confidence": {
"description": "The confidence score of the entire transcription, between 0 and 1",
"type": "number",
"minimum": 0,
"maximum": 1,
"format": "double"
},
"text": {
"description": "The partial transcript for your audio",
"type": "string"
},
"words": {
"description": "An array of objects, with the information for each word in the transcription text.\nIncludes the start and end time of the word in milliseconds, the confidence score of the word, and the text, which is the word itself.\n",
"type": "array",
"items": {
"$ref": "#/components/schemas/Word"
}
},
"created": {
"description": "The timestamp for the partial transcript",
"type": "string",
"pattern": "^(?:(\\d{4}-\\d{2}-\\d{2})T(\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?))$",
"x-fern-type": "datetime",
"x-ts-type": "Date"
}
},
"additionalProperties": false
},
"PartialTranscript": {
"summary": "As you send audio data to the API, the API immediately starts responding with Partial Transcript results.",
"x-fern-sdk-group-name": "realtime",
"allOf": [
{
"$ref": "#/components/schemas/RealtimeBaseTranscript"
},
{
"type": "object",
"required": ["message_type"],
"properties": {
"message_type": {
"description": "Describes the type of message",
"type": "string",
"const": "PartialTranscript"
}
},
"additionalProperties": false
}
],
"examples": [
{
"message_type": "PartialTranscript",
"created": "2023-11-03T17:14:13.854523",
"audio_start": 5310,
"audio_end": 7540,
"confidence": 0.59751355353605,
"text": "how can i show",
"words": [
{
"start": 7140,
"end": 7175,
"confidence": 0.466229424909777,
"text": "how"
},
{
"start": 7220,
"end": 7255,
"confidence": 0.432059008767216,
"text": "can"
},
{
"start": 7300,
"end": 7335,
"confidence": 0.994432034661841,
"text": "i"
},
{
"start": 7380,
"end": 7415,
"confidence": 0.497333745805364,
"text": "show"
}
]
}
]
},
"FinalTranscript": {
"summary": "Transcript text at the end of an utterance with punctuation and casing.",
"x-fern-sdk-group-name": "realtime",
"allOf": [
{
"$ref": "#/components/schemas/RealtimeBaseTranscript"
},
{
"type": "object",
"required": ["message_type", "punctuated", "text_formatted"],
"properties": {
"message_type": {
"description": "Describes the type of message",
"type": "string",
"const": "FinalTranscript"
},
"punctuated": {
"description": "Whether the text is punctuated and cased",
"type": "boolean"
},
"text_formatted": {
"description": "Whether the text is formatted, for example Dollar -> $",
"type": "boolean"
}
},
"additionalProperties": false
}
],
"examples": [
{
"message_type": "FinalTranscript",
"created": "2023-11-03T17:14:35.00332",
"audio_start": 5310,
"audio_end": 25580,
"confidence": 0.853363490052184,
"text": "How can I show these two slides? So that demonstrates that the guide Cap, which for most of the last 3 million years has been the size of the lower 48 States, has shrunk by 40%. But this understates the seriousness of this particular problem because it doesn't show the sickness of the ice, the Oregon of the beating heart of the global climate system. It expands in winter and contracts against summer. The next slide I show you will be a rapid fast forward of what happened over the last 25 years. The permanentized is marked in red, and as you see, it expands to the dark wood. That's an annual.",
"words": [
{
"start": 7140,
"end": 7175,
"confidence": 0.466229424909777,
"text": "How"
},
{
"start": 7220,
"end": 7255,
"confidence": 0.432059008767216,
"text": "can"
},
{
"start": 7300,
"end": 7335,
"confidence": 0.99,
"text": "I"
},
{
"start": 7380,
"end": 7415,
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}
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},
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"properties": {
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"description": "Start time of the word in milliseconds",
"type": "integer"
},
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"type": "number",
"minimum": 0,
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"format": "double"
},
"text": {
"description": "The word itself",
"type": "string"
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},
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"text": "how"
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{
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},
"AudioData": {
"type": "string",
"description": "Binary audio data",
"format": "binary",
"x-fern-sdk-group-name": "realtime",
"x-ts-type": "ArrayBufferLike"
},
"ForceEndUtterance": {
"description": "Manually end an utterance",
"x-fern-sdk-group-name": "realtime",
"type": "object",
"required": ["force_end_utterance"],
"properties": {
"force_end_utterance": {
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"type": "boolean"
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},
"additionalProperties": false,
"examples": [
{
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}
]
},
"ConfigureEndUtteranceSilenceThreshold": {
"description": "Configure the threshold for how long to wait before ending an utterance. Default is 700ms.",
"x-fern-sdk-group-name": "realtime",
"type": "object",
"required": ["end_utterance_silence_threshold"],
"properties": {
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"type": "integer",
"minimum": 0,
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},
"additionalProperties": false,
"examples": [
{
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}
]
},
"TerminateSession": {
"summary": "Terminate session",
"x-fern-sdk-group-name": "realtime",
"type": "object",
"required": ["terminate_session"],
"properties": {
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"description": "Set to true to end your streaming session forever",
"type": "boolean"
}
},
"additionalProperties": false,
"examples": [
{
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}
]
},
"AudioEncoding": {
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"default": "pcm_s16le",
"enum": ["pcm_s16le", "pcm_mulaw"],
"x-fern-enum": {
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"casing": {
"camel": "pcmS16le",
"snake": "pcm_s16le",
"pascal": "PcmS16le",
"screamingSnake": "PCM_S16LE"
}
},
"pcm_mulaw": {
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"casing": {
"camel": "pcmMulaw",
"snake": "pcm_mulaw",
"pascal": "PcmMulaw",
"screamingSnake": "PCM_MULAW"
}
}
},
"examples": ["pcm_s16le", "pcm_mulaw"]
}
},
"securitySchemes": {
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"description": "Authenticate using your AssemblyAI API key",
"type": "httpApiKey",
"in": "header",
"name": "Authorization"
},
"Token": {
"description": "Authenticate using a [generated temporary token](https://www.assemblyai.com/docs/speech-to-text/streaming#authenticate-with-a-temporary-token)",
"type": "httpApiKey",
"in": "query",
"name": "token"
}
}
}
}