{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://schemas.apievangelist.com/amazon-polly/speech-synthesis-definition",
  "name": "Amazon Polly Speech Synthesis Definition",
  "description": "Schema defining the structure of Amazon Polly speech synthesis resources, including voice configurations, lexicons, and synthesis task parameters for converting text to lifelike speech.",
  "type": "object",
  "required": [
    "OutputFormat",
    "Text",
    "VoiceId"
  ],
  "properties": {
    "Engine": {
      "type": "string",
      "enum": [
        "standard",
        "neural",
        "long-form",
        "generative"
      ],
      "description": "Specifies the engine for Amazon Polly to use when processing input text."
    },
    "LanguageCode": {
      "type": "string",
      "description": "The language identification tag for the voice."
    },
    "LexiconNames": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^[0-9A-Za-z]{1,20}$"
      },
      "maxItems": 5,
      "description": "List of one or more pronunciation lexicon names to apply during synthesis."
    },
    "OutputFormat": {
      "type": "string",
      "enum": [
        "json",
        "mp3",
        "ogg_vorbis",
        "pcm"
      ],
      "description": "The format in which the returned output will be encoded."
    },
    "SampleRate": {
      "type": "string",
      "description": "The audio frequency specified in Hz.",
      "enum": [
        "8000",
        "16000",
        "22050",
        "24000"
      ]
    },
    "SpeechMarkTypes": {
      "type": "array",
      "items": {
        "type": "string",
        "enum": [
          "sentence",
          "ssml",
          "viseme",
          "word"
        ]
      },
      "description": "The type of speech marks returned for the input text."
    },
    "Text": {
      "type": "string",
      "description": "The input text to synthesize.",
      "maxLength": 3000
    },
    "TextType": {
      "type": "string",
      "enum": [
        "ssml",
        "text"
      ],
      "description": "Specifies whether the input text is plain text or SSML."
    },
    "VoiceId": {
      "type": "string",
      "description": "The voice ID to use for the synthesis."
    }
  },
  "$defs": {
    "Voice": {
      "type": "object",
      "description": "Description of an Amazon Polly voice.",
      "properties": {
        "Gender": {
          "type": "string",
          "enum": [
            "Female",
            "Male"
          ],
          "description": "Gender of the voice."
        },
        "Id": {
          "type": "string",
          "description": "Amazon Polly assigned voice ID."
        },
        "LanguageCode": {
          "type": "string",
          "description": "Language code of the voice."
        },
        "LanguageName": {
          "type": "string",
          "description": "Human-readable name of the language."
        },
        "Name": {
          "type": "string",
          "description": "Name of the voice."
        },
        "AdditionalLanguageCodes": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Additional language codes the voice supports."
        },
        "SupportedEngines": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "standard",
              "neural",
              "long-form",
              "generative"
            ]
          },
          "description": "Specifies which engines are supported by the voice."
        }
      }
    },
    "Lexicon": {
      "type": "object",
      "description": "A pronunciation lexicon stored in an AWS Region.",
      "properties": {
        "Name": {
          "type": "string",
          "description": "Name of the lexicon.",
          "pattern": "^[0-9A-Za-z]{1,20}$"
        },
        "Content": {
          "type": "string",
          "description": "Lexicon content in PLS format."
        },
        "LexiconArn": {
          "type": "string",
          "description": "The ARN of the lexicon."
        },
        "LexemesCount": {
          "type": "int32",
          "description": "Number of lexemes in the lexicon."
        },
        "Size": {
          "type": "int32",
          "description": "Total size of the lexicon in characters."
        },
        "Alphabet": {
          "type": "string",
          "description": "Phonetic alphabet used in the lexicon.",
          "enum": [
            "ipa",
            "x-sampa"
          ]
        },
        "LanguageCode": {
          "type": "string",
          "description": "Language code the lexicon applies to."
        },
        "LastModified": {
          "type": "datetime",
          "description": "Timestamp when the lexicon was last modified."
        }
      }
    },
    "SynthesisTask": {
      "type": "object",
      "description": "An asynchronous speech synthesis task.",
      "properties": {
        "TaskId": {
          "type": "string",
          "description": "The unique identifier of the synthesis task."
        },
        "TaskStatus": {
          "type": "string",
          "enum": [
            "scheduled",
            "inProgress",
            "completed",
            "failed"
          ],
          "description": "Current status of the synthesis task."
        },
        "TaskStatusReason": {
          "type": "string",
          "description": "Reason for the current status of the task."
        },
        "OutputUri": {
          "type": "uri",
          "description": "Pathway for the output speech file."
        },
        "OutputFormat": {
          "type": "string",
          "enum": [
            "json",
            "mp3",
            "ogg_vorbis",
            "pcm"
          ]
        },
        "Engine": {
          "type": "string",
          "enum": [
            "standard",
            "neural",
            "long-form",
            "generative"
          ]
        },
        "VoiceId": {
          "type": "string"
        },
        "LanguageCode": {
          "type": "string"
        },
        "CreationTime": {
          "type": "datetime"
        },
        "RequestCharacters": {
          "type": "int32",
          "description": "Number of billable characters in the request."
        }
      }
    }
  }
}