SSML and LaTeX

# SSML feature description:
#     1. When sending the run-task command, set the enable_ssml parameter to true to enable SSML support
#     2. Send text containing SSML via the continue-task command, and only one continue-task command is allowed
# Use an SSML-compatible cloned or preset voice (such as longanyang for cosyvoice-v3-flash). See this page for supported models.

import websocket
import json
import uuid
import os
import time

class TTSClient:
    def __init__(self, api_key, uri):
        """
    Initialize a TTSClient instance

    Parameters:
        api_key (str): API Key for authentication
        uri (str): WebSocket service address
    """
        self.api_key = api_key  # Replace with your API Key
        self.uri = uri  # Replace with your WebSocket address
        self.task_id = str(uuid.uuid4())  # Generate a unique task ID
        self.output_file = f"output_{int(time.time())}.mp3"  # Output audio file path
        self.ws = None  # WebSocketApp instance
        self.task_started = False  # Whether task-started has been received
        self.task_finished = False  # Whether task-finished / task-failed has been received

    def on_open(self, ws):
        """
    Callback when WebSocket connection is established
    Sends run-task command to start the speech synthesis task
    """
        print("WebSocket connected")

        # Construct run-task command
        run_task_cmd = {
            "header": {
                "action": "run-task",
                "task_id": self.task_id,
                "streaming": "duplex"
            },
            "payload": {
                "task_group": "audio",
                "task": "tts",
                "function": "SpeechSynthesizer",
                "model": "cosyvoice-v3-flash",
                "parameters": {
                    "text_type": "PlainText",
                    "voice": "longanyang",
                    "format": "mp3",
                    "sample_rate": 22050,
                    "volume": 50,
                    "rate": 1,
                    "pitch": 1,
                    # If enable_ssml is set to True, only one continue-task command is allowed; otherwise the error "Text request limit violated, expected 1." will be returned
                    "enable_ssml": True
                },
                "input": {}
            }
        }

        # Send run-task command
        ws.send(json.dumps(run_task_cmd))
        print("run-task command sent")

    def on_message(self, ws, message):
        """
    Callback when a message is received
    Handles text and binary messages separately
    """
        if isinstance(message, str):
            # Process JSON text messages
            try:
                msg_json = json.loads(message)
                print(f"Received JSON message: {msg_json}")

                if "header" in msg_json:
                    header = msg_json["header"]

                    if "event" in header:
                        event = header["event"]

                        if event == "task-started":
                            print("Task started")
                            self.task_started = True

                            # Send continue-task command. When using SSML, this command can only be sent once
                            # Special characters need to be escaped
                            self.send_continue_task("<speak rate=\"2\">My speaking rate is faster than a normal person's.</speak>")

                            # Send finish-task after continue-task is sent
                            self.send_finish_task()

                        elif event == "task-finished":
                            print("Task completed")
                            self.task_finished = True
                            self.close(ws)

                        elif event == "task-failed":
                            error_msg = msg_json.get("error_message", "Unknown error")
                            print(f"Task failed: {error_msg}")
                            self.task_finished = True
                            self.close(ws)

            except json.JSONDecodeError as e:
                print(f"JSON parsing failed: {e}")
        else:
            # Process binary messages (audio data)
            print(f"Received binary message, size: {len(message)} bytes")
            with open(self.output_file, "ab") as f:
                f.write(message)
            print(f"Audio data written to local file {self.output_file}")

    def on_error(self, ws, error):
        """Callback when an error occurs"""
        print(f"WebSocket error: {error}")

    def on_close(self, ws, close_status_code, close_msg):
        """Callback when connection is closed"""
        print(f"WebSocket closed: {close_msg} ({close_status_code})")

    def send_continue_task(self, text):
        """Send continue-task command with the text content to synthesize"""
        cmd = {
            "header": {
                "action": "continue-task",
                "task_id": self.task_id,
                "streaming": "duplex"
            },
            "payload": {
                "input": {
                    "text": text
                }
            }
        }

        self.ws.send(json.dumps(cmd))
        print(f"continue-task command sent, text content: {text}")

    def send_finish_task(self):
        """Send finish-task command to end the speech synthesis task"""
        cmd = {
            "header": {
                "action": "finish-task",
                "task_id": self.task_id,
                "streaming": "duplex"
            },
            "payload": {
                "input": {}
            }
        }

        self.ws.send(json.dumps(cmd))
        print("finish-task command sent")

    def close(self, ws):
        """Actively close the connection"""
        if ws and ws.sock and ws.sock.connected:
            ws.close()
            print("Connection closed actively")

    def run(self):
        """Start the WebSocket client"""
        # Set request headers (authentication)
        header = {
            "Authorization": f"bearer {self.api_key}",
            "X-DashScope-DataInspection": "enable"
        }

        # Create WebSocketApp instance
        self.ws = websocket.WebSocketApp(
            self.uri,
            header=header,
            on_open=self.on_open,
            on_message=self.on_message,
            on_error=self.on_error,
            on_close=self.on_close
        )

        print("Listening for WebSocket messages...")
        self.ws.run_forever()  # Start persistent connection listener

# Example usage
if __name__ == "__main__":
    # The API Keys for the Singapore and Beijing regions are different. Get an API Key: https://www.alibabacloud.com/help/model-studio/get-api-key
    # If you have not configured an environment variable, replace the following line with your Model Studio API Key: API_KEY = "sk-xxx"
    API_KEY = os.environ.get("DASHSCOPE_API_KEY")
    # Singapore region URL. Replace WorkspaceId with your actual workspace ID. The URL varies by region.
    SERVER_URI = "wss://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api-ws/v1/inference/"

    client = TTSClient(API_KEY, SERVER_URI)
    client.run()

// SSML feature description:
//     1. When sending the run-task command, set the enable_ssml parameter to true to enable SSML support
//     2. Send text containing SSML via the continue-task command, and only one continue-task command is allowed
// Use an SSML-compatible cloned or preset voice (such as longanyang for cosyvoice-v3-flash). See this page for supported models.

package main

import (
    "encoding/json"
    "fmt"
    "net/http"
    "os"
    "strings"
    "time"

    "github.com/google/uuid"
    "github.com/gorilla/websocket"
)

const (
    // Singapore region URL. Replace WorkspaceId with your actual workspace ID. The URL varies by region.
    wsURL      = "wss://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api-ws/v1/inference/"
    outputFile = "output.mp3"
)

func main() {
    // The API Keys for the Singapore and Beijing regions are different. Get an API Key: https://www.alibabacloud.com/help/model-studio/get-api-key
    // If you have not configured an environment variable, replace the following line with your Model Studio API Key: apiKey := "sk-xxx"
    apiKey := os.Getenv("DASHSCOPE_API_KEY")

    // Clear the output file
    os.Remove(outputFile)
    os.Create(outputFile)

    // Connect to WebSocket
    header := make(http.Header)
    header.Add("X-DashScope-DataInspection", "enable")
    header.Add("Authorization", fmt.Sprintf("bearer %s", apiKey))

    conn, resp, err := websocket.DefaultDialer.Dial(wsURL, header)
    if err != nil {
        if resp != nil {
            fmt.Printf("Connection failed, HTTP status code: %d\n", resp.StatusCode)
        }
        fmt.Println("Connection failed:", err)
        return
    }
    defer conn.Close()

    // Generate task ID
    taskID := uuid.New().String()
    fmt.Printf("Generated task ID: %s\n", taskID)

    // Send run-task command
    runTaskCmd := map[string]interface{}{
        "header": map[string]interface{}{
            "action":    "run-task",
            "task_id":   taskID,
            "streaming": "duplex",
        },
        "payload": map[string]interface{}{
            "task_group": "audio",
            "task":       "tts",
            "function":   "SpeechSynthesizer",
            "model":      "cosyvoice-v3-flash",
            "parameters": map[string]interface{}{
                "text_type":   "PlainText",
                "voice":       "longanyang",
                "format":      "mp3",
                "sample_rate": 22050,
                "volume":      50,
                "rate":        1,
                "pitch":       1,
                // If enable_ssml is set to true, only one continue-task command is allowed; otherwise the error "Text request limit violated, expected 1." will be returned
                "enable_ssml": true,
            },
            "input": map[string]interface{}{},
        },
    }

    runTaskJSON, _ := json.Marshal(runTaskCmd)
    fmt.Printf("Sending run-task command: %s\n", string(runTaskJSON))

    err = conn.WriteMessage(websocket.TextMessage, runTaskJSON)
    if err != nil {
        fmt.Println("Failed to send run-task:", err)
        return
    }

    textSent := false

    // Process messages
    for {
        messageType, message, err := conn.ReadMessage()
        if err != nil {
            fmt.Println("Failed to read message:", err)
            break
        }

        // Process binary messages
        if messageType == websocket.BinaryMessage {
            fmt.Printf("Received binary message, length: %d\n", len(message))
            file, _ := os.OpenFile(outputFile, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
            file.Write(message)
            file.Close()
            continue
        }

        // Process text messages
        messageStr := string(message)
        fmt.Printf("Received text message: %s\n", strings.ReplaceAll(messageStr, "\n", ""))

        // Simple JSON parsing to get event type
        var msgMap map[string]interface{}
        if json.Unmarshal(message, &msgMap) == nil {
            if header, ok := msgMap["header"].(map[string]interface{}); ok {
                if event, ok := header["event"].(string); ok {
                    fmt.Printf("Event type: %s\n", event)

                    switch event {
                    case "task-started":
                        fmt.Println("=== Received task-started event ===")

                        if !textSent {
                            // Send continue-task command. When using SSML, this command can only be sent once
                            continueTaskCmd := map[string]interface{}{
                                "header": map[string]interface{}{
                                    "action":    "continue-task",
                                    "task_id":   taskID,
                                    "streaming": "duplex",
                                },
                                "payload": map[string]interface{}{
                                    "input": map[string]interface{}{
                                        // Special characters need to be escaped
                                        "text": "<speak rate=\"2\">My speaking rate is faster than a normal person's.</speak>",
                                    },
                                },
                            }

                            continueTaskJSON, _ := json.Marshal(continueTaskCmd)
                            fmt.Printf("Sending continue-task command: %s\n", string(continueTaskJSON))

                            err = conn.WriteMessage(websocket.TextMessage, continueTaskJSON)
                            if err != nil {
                                fmt.Println("Failed to send continue-task:", err)
                                return
                            }

                            textSent = true

                            // Delay before sending finish-task
                            time.Sleep(500 * time.Millisecond)

                            // Send finish-task command
                            finishTaskCmd := map[string]interface{}{
                                "header": map[string]interface{}{
                                    "action":    "finish-task",
                                    "task_id":   taskID,
                                    "streaming": "duplex",
                                },
                                "payload": map[string]interface{}{
                                    "input": map[string]interface{}{},
                                },
                            }

                            finishTaskJSON, _ := json.Marshal(finishTaskCmd)
                            fmt.Printf("Sending finish-task command: %s\n", string(finishTaskJSON))

                            err = conn.WriteMessage(websocket.TextMessage, finishTaskJSON)
                            if err != nil {
                                fmt.Println("Failed to send finish-task:", err)
                                return
                            }
                        }

                    case "task-finished":
                        fmt.Println("=== Task completed ===")
                        return

                    case "task-failed":
                        fmt.Println("=== Task failed ===")
                        if header["error_message"] != nil {
                            fmt.Printf("Error message: %s\n", header["error_message"])
                        }
                        return

                    case "result-generated":
                        fmt.Println("Received result-generated event")
                    }
                }
            }
        }
    }
}

using System.Net.WebSockets;
using System.Text;
using System.Text.Json;

// SSML feature description:
//     1. When sending the run-task command, set the enable_ssml parameter to true to enable SSML support
//     2. Send text containing SSML via the continue-task command, and only one continue-task command is allowed
// Use an SSML-compatible cloned or preset voice (such as longanyang for cosyvoice-v3-flash). See this page for supported models.
class Program {
    // The API Keys for the Singapore and Beijing regions are different. Get an API Key: https://www.alibabacloud.com/help/model-studio/get-api-key
    // If you have not configured an environment variable, replace the following line with your Model Studio API Key: private static readonly string ApiKey = "sk-xxx"
    private static readonly string ApiKey = Environment.GetEnvironmentVariable("DASHSCOPE_API_KEY") ?? throw new InvalidOperationException("DASHSCOPE_API_KEY environment variable is not set.");

    // Singapore region URL. Replace WorkspaceId with your actual workspace ID. The URL varies by region.
    private const string WebSocketUrl = "wss://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api-ws/v1/inference/";
    // Output file path
    private const string OutputFilePath = "output.mp3";

    // WebSocket client
    private static ClientWebSocket _webSocket = new ClientWebSocket();
    // Cancellation token source
    private static CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
    // Task ID
    private static string? _taskId;
    // Whether the task has started
    private static TaskCompletionSource<bool> _taskStartedTcs = new TaskCompletionSource<bool>();

    static async Task Main(string[] args) {
        try {
            // Clear the output file
            ClearOutputFile(OutputFilePath);

            // Connect to the WebSocket service
            await ConnectToWebSocketAsync(WebSocketUrl);

            // Start the message receiving task
            Task receiveTask = ReceiveMessagesAsync();

            // Send run-task command
            _taskId = GenerateTaskId();
            await SendRunTaskCommandAsync(_taskId);

            // Wait for the task-started event
            await _taskStartedTcs.Task;

            // Send continue-task command. When using SSML, this command can only be sent once
            // Special characters need to be escaped
            await SendContinueTaskCommandAsync("<speak rate=\"2\">My speaking rate is faster than a normal person's.</speak>");

            // Send finish-task command
            await SendFinishTaskCommandAsync(_taskId);

            // Wait for the receiving task to complete
            await receiveTask;

            Console.WriteLine("Task completed, connection closed.");
        } catch (OperationCanceledException) {
            Console.WriteLine("Task was cancelled.");
        } catch (Exception ex) {
            Console.WriteLine($"An error occurred: {ex.Message}");
        } finally {
            _cancellationTokenSource.Cancel();
            _webSocket.Dispose();
        }
    }

    private static void ClearOutputFile(string filePath) {
        if (File.Exists(filePath)) {
            File.WriteAllText(filePath, string.Empty);
            Console.WriteLine("Output file cleared.");
        } else {
            Console.WriteLine("Output file does not exist, no need to clear.");
        }
    }

    private static async Task ConnectToWebSocketAsync(string url) {
        var uri = new Uri(url);
        if (_webSocket.State == WebSocketState.Connecting || _webSocket.State == WebSocketState.Open) {
            return;
        }

        // Set WebSocket connection headers
        _webSocket.Options.SetRequestHeader("Authorization", $"bearer {ApiKey}");
        _webSocket.Options.SetRequestHeader("X-DashScope-DataInspection", "enable");

        try {
            await _webSocket.ConnectAsync(uri, _cancellationTokenSource.Token);
            Console.WriteLine("Successfully connected to the WebSocket service.");
        } catch (OperationCanceledException) {
            Console.WriteLine("WebSocket connection was cancelled.");
        } catch (Exception ex) {
            Console.WriteLine($"WebSocket connection failed: {ex.Message}");
            throw;
        }
    }

    private static async Task SendRunTaskCommandAsync(string taskId) {
        var command = CreateCommand("run-task", taskId, "duplex", new {
            task_group = "audio",
            task = "tts",
            function = "SpeechSynthesizer",
            model = "cosyvoice-v3-flash",
            parameters = new
            {
                text_type = "PlainText",
                voice = "longanyang",
                format = "mp3",
                sample_rate = 22050,
                volume = 50,
                rate = 1,
                pitch = 1,
                // If enable_ssml is set to true, only one continue-task command is allowed; otherwise the error "Text request limit violated, expected 1." will be returned
                enable_ssml = true
            },
            input = new { }
        });

        await SendJsonMessageAsync(command);
        Console.WriteLine("run-task command sent.");
    }

    private static async Task SendContinueTaskCommandAsync(string text) {
        if (_taskId == null) {
            throw new InvalidOperationException("Task ID is not initialized.");
        }

        var command = CreateCommand("continue-task", _taskId, "duplex", new {
            input = new {
                text
            }
        });

        await SendJsonMessageAsync(command);
        Console.WriteLine("continue-task command sent.");
    }

    private static async Task SendFinishTaskCommandAsync(string taskId) {
        var command = CreateCommand("finish-task", taskId, "duplex", new {
            input = new { }
        });

        await SendJsonMessageAsync(command);
        Console.WriteLine("finish-task command sent.");
    }

    private static async Task SendJsonMessageAsync(string message) {
        var buffer = Encoding.UTF8.GetBytes(message);
        try {
            await _webSocket.SendAsync(new ArraySegment<byte>(buffer), WebSocketMessageType.Text, true, _cancellationTokenSource.Token);
        } catch (OperationCanceledException) {
            Console.WriteLine("Message sending was cancelled.");
        }
    }

    private static async Task ReceiveMessagesAsync() {
        while (_webSocket.State == WebSocketState.Open) {
            var response = await ReceiveMessageAsync();
            if (response != null) {
                var eventStr = response.RootElement.GetProperty("header").GetProperty("event").GetString();
                switch (eventStr) {
                    case "task-started":
                        Console.WriteLine("Task started.");
                        _taskStartedTcs.TrySetResult(true);
                        break;
                    case "task-finished":
                        Console.WriteLine("Task finished.");
                        _cancellationTokenSource.Cancel();
                        break;
                    case "task-failed":
                        Console.WriteLine("Task failed: " + response.RootElement.GetProperty("header").GetProperty("error_message").GetString());
                        _cancellationTokenSource.Cancel();
                        break;
                    default:
                        // result-generated can be handled here
                        break;
                }
            }
        }
    }

    private static async Task<JsonDocument?> ReceiveMessageAsync() {
        var buffer = new byte[1024 * 4];
        var segment = new ArraySegment<byte>(buffer);

        try {
            WebSocketReceiveResult result = await _webSocket.ReceiveAsync(segment, _cancellationTokenSource.Token);

            if (result.MessageType == WebSocketMessageType.Close) {
                await _webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Closing", _cancellationTokenSource.Token);
                return null;
            }

            if (result.MessageType == WebSocketMessageType.Binary) {
                // Process binary data
                Console.WriteLine("Received binary data...");

                // Save binary data to file
                using (var fileStream = new FileStream(OutputFilePath, FileMode.Append)) {
                    fileStream.Write(buffer, 0, result.Count);
                }

                return null;
            }

            string message = Encoding.UTF8.GetString(buffer, 0, result.Count);
            return JsonDocument.Parse(message);
        } catch (OperationCanceledException) {
            Console.WriteLine("Message receiving was cancelled.");
            return null;
        }
    }

    private static string GenerateTaskId() {
        return Guid.NewGuid().ToString("N").Substring(0, 32);
    }

    private static string CreateCommand(string action, string taskId, string streaming, object payload) {
        var command = new {
            header = new {
                action,
                task_id = taskId,
                streaming
            },
            payload
        };

        return JsonSerializer.Serialize(command);
    }
}

<!-- SSML feature description: -->
<!--     1. When sending the run-task command, set the enable_ssml parameter to true to enable SSML support -->
<!--     2. Send text containing SSML via the continue-task command, and only one continue-task command is allowed -->
<!--     3. Only cloned voices of the qwen-audio-3.0-tts-flash, qwen-audio-3.0-tts-plus, cosyvoice-v3-flash, cosyvoice-v3-plus, and cosyvoice-v2 models, as well as system voices marked as SSML-supported in the voice list, support the SSML feature (for example, the longanyang voice of the cosyvoice-v3-flash model) -->

<?php

require __DIR__ . '/vendor/autoload.php';

use Ratchet\Client\Connector;
use React\EventLoop\Loop;
use React\Socket\Connector as SocketConnector;

// The API Keys for the Singapore and Beijing regions are different. Get an API Key: https://www.alibabacloud.com/help/model-studio/get-api-key
// If you have not configured an environment variable, replace the following line with your Model Studio API Key: $api_key = "sk-xxx"
$api_key = getenv("DASHSCOPE_API_KEY");
// Singapore region URL. Replace WorkspaceId with your actual workspace ID. The URL varies by region.
$websocket_url = 'wss://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api-ws/v1/inference/'; // WebSocket server address
$output_file = 'output.mp3'; // Output file path

$loop = Loop::get();

if (file_exists($output_file)) {
    // Clear file contents
    file_put_contents($output_file, '');
}

// Create a custom connector
$socketConnector = new SocketConnector($loop, [
    'tcp' => [
        'bindto' => '0.0.0.0:0',
    ],
    'tls' => [
        'verify_peer' => false,
        'verify_peer_name' => false,
    ],
]);

$connector = new Connector($loop, $socketConnector);

$headers = [
    'Authorization' => 'bearer ' . $api_key,
    'X-DashScope-DataInspection' => 'enable'
];

$connector($websocket_url, [], $headers)->then(function ($conn) use ($loop, $output_file) {
    echo "Connected to WebSocket server\n";

    // Generate task ID
    $taskId = generateTaskId();

    // Send run-task command
    sendRunTaskMessage($conn, $taskId);

    // Define the function to send continue-task command
    $sendContinueTask = function() use ($conn, $loop, $taskId) {
        // Send continue-task command. When using SSML, this command can only be sent once
        $continueTaskMessage = json_encode([
            "header" => [
                "action" => "continue-task",
                "task_id" => $taskId,
                "streaming" => "duplex"
            ],
            "payload" => [
                "input" => [
                    // Special characters need to be escaped
                    "text" => "<speak rate=\"2\">My speaking rate is faster than a normal person's.</speak>"
                ]
            ]
        ]);
        $conn->send($continueTaskMessage);

        // Send finish-task command
        sendFinishTaskMessage($conn, $taskId);
    };

    // Flag for whether task-started event has been received
    $taskStarted = false;

    // Listen for messages
    $conn->on('message', function($msg) use ($conn, $sendContinueTask, $loop, &$taskStarted, $taskId, $output_file) {
        if ($msg->isBinary()) {
            // Write binary data to local file
            file_put_contents($output_file, $msg->getPayload(), FILE_APPEND);
        } else {
            // Process non-binary messages
            $response = json_decode($msg, true);

            if (isset($response['header']['event'])) {
                handleEvent($conn, $response, $sendContinueTask, $loop, $taskId, $taskStarted);
            } else {
                echo "Unknown message format\n";
            }
        }
    });

    // Listen for connection close
    $conn->on('close', function($code = null, $reason = null) {
        echo "Connection closed\n";
        if ($code !== null) {
            echo "Close code: " . $code . "\n";
        }
        if ($reason !== null) {
            echo "Close reason: " . $reason . "\n";
        }
    });
}, function ($e) {
    echo "Unable to connect: {$e->getMessage()}\n";
});

$loop->run();

/**
 * Generate task ID
 * @return string
 */
function generateTaskId(): string {
    return bin2hex(random_bytes(16));
}

/**
 * Send run-task command
 * @param $conn
 * @param $taskId
 */
function sendRunTaskMessage($conn, $taskId) {
    $runTaskMessage = json_encode([
        "header" => [
            "action" => "run-task",
            "task_id" => $taskId,
            "streaming" => "duplex"
        ],
        "payload" => [
            "task_group" => "audio",
            "task" => "tts",
            "function" => "SpeechSynthesizer",
            "model" => "cosyvoice-v3-flash",
            "parameters" => [
                "text_type" => "PlainText",
                "voice" => "longanyang",
                "format" => "mp3",
                "sample_rate" => 22050,
                "volume" => 50,
                "rate" => 1,
                "pitch" => 1,
                // If enable_ssml is set to true, only one continue-task command is allowed; otherwise the error "Text request limit violated, expected 1." will be returned
                "enable_ssml" => true
            ],
            "input" => (object) []
        ]
    ]);
    echo "Preparing to send run-task command: " . $runTaskMessage . "\n";
    $conn->send($runTaskMessage);
    echo "run-task command sent\n";
}

/**
 * Read audio file
 * @param string $filePath
 * @return bool|string
 */
function readAudioFile(string $filePath) {
    $voiceData = file_get_contents($filePath);
    if ($voiceData === false) {
        echo "Unable to read audio file\n";
    }
    return $voiceData;
}

/**
 * Split audio data
 * @param string $data
 * @param int $chunkSize
 * @return array
 */
function splitAudioData(string $data, int $chunkSize): array {
    return str_split($data, $chunkSize);
}

/**
 * Send finish-task command
 * @param $conn
 * @param $taskId
 */
function sendFinishTaskMessage($conn, $taskId) {
    $finishTaskMessage = json_encode([
        "header" => [
            "action" => "finish-task",
            "task_id" => $taskId,
            "streaming" => "duplex"
        ],
        "payload" => [
            "input" => (object) []
        ]
    ]);
    echo "Preparing to send finish-task command: " . $finishTaskMessage . "\n";
    $conn->send($finishTaskMessage);
    echo "finish-task command sent\n";
}

/**
 * Handle events
 * @param $conn
 * @param $response
 * @param $sendContinueTask
 * @param $loop
 * @param $taskId
 * @param $taskStarted
 */
function handleEvent($conn, $response, $sendContinueTask, $loop, $taskId, &$taskStarted) {
    switch ($response['header']['event']) {
        case 'task-started':
            echo "Task started, sending continue-task command...\n";
            $taskStarted = true;
            // Send continue-task command
            $sendContinueTask();
            break;
        case 'result-generated':
            // Ignore result-generated events
            break;
        case 'task-finished':
            echo "Task completed\n";
            $conn->close();
            break;
        case 'task-failed':
            echo "Task failed\n";
            echo "Error code: " . $response['header']['error_code'] . "\n";
            echo "Error message: " . $response['header']['error_message'] . "\n";
            $conn->close();
            break;
        case 'error':
            echo "Error: " . $response['payload']['message'] . "\n";
            break;
        default:
            echo "Unknown event: " . $response['header']['event'] . "\n";
            break;
    }

    // If the task is completed, close the connection
    if ($response['header']['event'] == 'task-finished') {
        // Wait 1 second to ensure all data has been transmitted
        $loop->addTimer(1, function() use ($conn) {
            $conn->close();
            echo "Client closed connection\n";
        });
    }

    // If task-started event has not been received, close the connection
    if (!$taskStarted && in_array($response['header']['event'], ['task-failed', 'error'])) {
        $conn->close();
    }
}

// SSML feature description:
//     1. When sending the run-task command, set the enable_ssml parameter to true to enable SSML support
//     2. Send text containing SSML via the continue-task command, and only one continue-task command is allowed
// Use an SSML-compatible cloned or preset voice (such as longanyang for cosyvoice-v3-flash). See this page for supported models.

import fs from 'fs';
import WebSocket from 'ws';
import { v4 as uuid } from 'uuid'; // For generating UUIDs

// The API Keys for the Singapore and Beijing regions are different. Get an API Key: https://www.alibabacloud.com/help/model-studio/get-api-key
// If you have not configured an environment variable, replace the following line with your Model Studio API Key: const apiKey = "sk-xxx"
const apiKey = process.env.DASHSCOPE_API_KEY;
// Singapore region URL. Replace WorkspaceId with your actual workspace ID. The URL varies by region.
const url = 'wss://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api-ws/v1/inference/';
// Output file path
const outputFilePath = 'output.mp3';

// Clear the output file
fs.writeFileSync(outputFilePath, '');

// Create WebSocket client
const ws = new WebSocket(url, {
  headers: {
    Authorization: `bearer ${apiKey}`,
    'X-DashScope-DataInspection': 'enable'
  }
});

let taskStarted = false;
let taskId = uuid();

ws.on('open', () => {
  console.log('Connected to WebSocket server');

  // Send run-task command
  const runTaskMessage = JSON.stringify({
    header: {
      action: 'run-task',
      task_id: taskId,
      streaming: 'duplex'
    },
    payload: {
      task_group: 'audio',
      task: 'tts',
      function: 'SpeechSynthesizer',
      model: 'cosyvoice-v3-flash',
      parameters: {
        text_type: 'PlainText',
        voice: 'longanyang', // Voice
        format: 'mp3', // Audio format
        sample_rate: 22050, // Sample rate
        volume: 50, // Volume
        rate: 1, // Speech rate
        pitch: 1, // Pitch
        enable_ssml: true // Whether to enable SSML. If enable_ssml is set to true, only one continue-task command is allowed; otherwise the error "Text request limit violated, expected 1." will be returned
      },
      input: {}
    }
  });
  ws.send(runTaskMessage);
  console.log('run-task message sent');
});

const fileStream = fs.createWriteStream(outputFilePath, { flags: 'a' });
ws.on('message', (data, isBinary) => {
  if (isBinary) {
    // Write binary data to file
    fileStream.write(data);
  } else {
    const message = JSON.parse(data);

    switch (message.header.event) {
      case 'task-started':
        taskStarted = true;
        console.log('Task started');
        // Send continue-task command
        sendContinueTasks(ws);
        break;
      case 'task-finished':
        console.log('Task completed');
        ws.close();
        fileStream.end(() => {
          console.log('File stream closed');
        });
        break;
      case 'task-failed':
        console.error('Task failed:', message.header.error_message);
        ws.close();
        fileStream.end(() => {
          console.log('File stream closed');
        });
        break;
      default:
        // result-generated can be handled here
        break;
    }
  }
});

function sendContinueTasks(ws) {

  if (taskStarted) {
    // Send continue-task command. When using SSML, this command can only be sent once
    const continueTaskMessage = JSON.stringify({
      header: {
        action: 'continue-task',
        task_id: taskId,
        streaming: 'duplex'
      },
      payload: {
        input: {
          // Special characters need to be escaped
          text: '<speak rate="2">My speaking rate is faster than a normal person's.</speak>'
        }
      }
    });
    ws.send(continueTaskMessage);

    // Send finish-task command
    const finishTaskMessage = JSON.stringify({
      header: {
        action: 'finish-task',
        task_id: taskId,
        streaming: 'duplex'
      },
      payload: {
        input: {}
      }
    });
    ws.send(finishTaskMessage);
  }
}

ws.on('close', () => {
  console.log('Disconnected from WebSocket server');
});