feat: enable podcast

web/src/app/_components/message-list-view.tsx

@@ -1,9 +1,14 @@
 // Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 // SPDX-License-Identifier: MIT
 
+import {
+  DownloadOutlined,
+  SoundOutlined,
+  LoadingOutlined,
+} from "@ant-design/icons";
 import { parse } from "best-effort-json-parser";
 import { motion } from "framer-motion";
-import { useCallback, useMemo } from "react";
+import { useCallback, useMemo, useState } from "react";
 
 import { Button } from "~/components/ui/button";
 import {
@@ -13,6 +18,11 @@ import {
   CardHeader,
   CardTitle,
 } from "~/components/ui/card";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipTrigger,
+} from "~/components/ui/tooltip";
 import type { Message, Option } from "~/core/messages";
 import {
   openResearch,
@@ -114,6 +124,7 @@ function MessageListItem({
       message.role === "user" ||
       message.agent === "coordinator" ||
       message.agent === "planner" ||
+      message.agent === "podcast" ||
       startOfResearch
     ) {
       let content: React.ReactNode;
@@ -128,6 +139,12 @@ function MessageListItem({
             />
           </div>
         );
+      } else if (message.agent === "podcast") {
+        content = (
+          <div className="w-full px-4">
+            <PodcastCard message={message} />
+          </div>
+        );
       } else if (startOfResearch) {
         content = (
           <div className="w-full px-4">
@@ -348,3 +365,63 @@ function PlanCard({
     </Card>
   );
 }
+
+function PodcastCard({
+  className,
+  message,
+}: {
+  className?: string;
+  message: Message;
+}) {
+  const data = useMemo(() => {
+    return parse(message.content ?? "");
+  }, [message.content]);
+  const title = useMemo(() => data?.title, [data]);
+  const audioUrl = useMemo(() => data?.audioUrl, [data]);
+  const isGenerating = useMemo(() => {
+    return message.isStreaming;
+  }, [message.isStreaming]);
+  const [isPlaying, setIsPlaying] = useState(false);
+  return (
+    <Card className={cn("w-[508px] bg-white", className)}>
+      <CardHeader>
+        <div className="text-muted-foreground flex items-center justify-between text-sm">
+          <div className="flex items-center gap-2">
+            {isGenerating ? <LoadingOutlined /> : <SoundOutlined />}
+            <RainbowText animated={isGenerating}>
+              {isGenerating
+                ? "Generating podcast..."
+                : isPlaying
+                  ? "Now playing podcast..."
+                  : "Podcast"}
+            </RainbowText>
+          </div>
+          <div className="flex">
+            <Tooltip>
+              <TooltipTrigger asChild>
+                <Button variant="ghost" size="icon">
+                  <DownloadOutlined />
+                </Button>
+              </TooltipTrigger>
+              <TooltipContent>Download podcast</TooltipContent>
+            </Tooltip>
+          </div>
+        </div>
+        <CardTitle>
+          <div className="text-lg font-medium">
+            <RainbowText animated={isGenerating}>{title}</RainbowText>
+          </div>
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <audio
+          className="w-full"
+          src={audioUrl}
+          controls
+          onPlay={() => setIsPlaying(true)}
+          onPause={() => setIsPlaying(false)}
+        />
+      </CardContent>
+    </Card>
+  );
+}

web/src/app/_components/research-block.tsx

@@ -80,8 +80,12 @@ export function ResearchBlock({
           </div>
           <TabsContent className="h-full min-h-0 flex-grow px-8" value="report">
             <ScrollContainer className="px-5pb-20 h-full">
-              {reportId && (
+              {reportId && researchId && (
-                <ResearchReportBlock className="mt-4" messageId={reportId} />
+                <ResearchReportBlock
+                  className="mt-4"
+                  researchId={researchId}
+                  messageId={reportId}
+                />
               )}
             </ScrollContainer>
           </TabsContent>

web/src/app/_components/research-report-block.tsx

@@ -1,7 +1,7 @@
 // Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 // SPDX-License-Identifier: MIT
 
-import { PauseCircleOutlined, SoundOutlined } from "@ant-design/icons";
+import { SoundOutlined } from "@ant-design/icons";
 import { useCallback, useRef, useState } from "react";
 
 import { Button } from "~/components/ui/button";
@@ -10,7 +10,7 @@ import {
   TooltipTrigger,
   TooltipContent,
 } from "~/components/ui/tooltip";
-import { useMessage } from "~/core/store";
+import { listenToPodcast, useMessage } from "~/core/store";
 import { cn } from "~/lib/utils";
 
 import { LoadingAnimation } from "./loading-animation";
@@ -18,29 +18,23 @@ import { Markdown } from "./markdown";
 
 export function ResearchReportBlock({
   className,
+  researchId,
   messageId,
 }: {
   className?: string;
+  researchId: string;
   messageId: string;
 }) {
   const message = useMessage(messageId);
   const contentRef = useRef<HTMLDivElement>(null);
-  const [isTTS, setIsTTS] = useState(false);
+  const [isGenerated, setGenerated] = useState(false);
-  const handleTTS = useCallback(() => {
+  const handleListenToReport = useCallback(async () => {
-    if (contentRef.current) {
+    if (isGenerated) {
-      if (isTTS) {
+      return;
-        window.speechSynthesis.cancel();
-        setIsTTS(false);
-      } else {
-        const text = contentRef.current.textContent;
-        if (text) {
-          const utterance = new SpeechSynthesisUtterance(text);
-          setIsTTS(true);
-          window.speechSynthesis.speak(utterance);
     }
-      }
+    setGenerated(true);
-    }
+    await listenToPodcast(researchId);
-  }, [isTTS]);
+  }, [isGenerated, researchId]);
   return (
     <div
       ref={contentRef}
@@ -54,14 +48,16 @@ export function ResearchReportBlock({
                 variant="outline"
                 size="icon"
                 onClick={() => {
-                  handleTTS();
+                  void handleListenToReport();
                 }}
               >
-                {isTTS ? <PauseCircleOutlined /> : <SoundOutlined />}
+                <SoundOutlined />
               </Button>
             </TooltipTrigger>
             <TooltipContent>
-              <p>{isTTS ? "Pause" : "Listen to the report"}</p>
+              <p>
+                {isGenerated ? "The podcast is generated" : "Generate podcast"}
+              </p>
             </TooltipContent>
           </Tooltip>
         )}

web/src/core/api/chat.ts

@@ -64,9 +64,9 @@ async function* chatStreamMock(
     const [, event] = eventRaw.split("event: ", 2) as [string, string];
     const [, data] = dataRaw.split("data: ", 2) as [string, string];
     if (event === "message_chunk") {
-      await sleep(100);
+      await sleep(0);
     } else if (event === "tool_call_result") {
-      await sleep(2000);
+      await sleep(0);
     }
     try {
       yield {

web/src/core/api/podcast.ts

@@ -0,0 +1,19 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
+export async function generatePodcast(content: string) {
+  const response = await fetch("/api/podcast/generate", {
+    method: "post",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({ content }),
+  });
+  if (!response.ok) {
+    throw new Error(`HTTP error! status: ${response.status}`);
+  }
+  const arrayBuffer = await response.arrayBuffer();
+  const blob = new Blob([arrayBuffer], { type: "audio/mp3" });
+  const audioUrl = URL.createObjectURL(blob);
+  return audioUrl;
+}

web/src/core/messages/types.ts

@@ -6,7 +6,13 @@ export type MessageRole = "user" | "assistant" | "tool";
 export interface Message {
   id: string;
   threadId: string;
-  agent?: "coordinator" | "planner" | "researcher" | "coder" | "reporter";
+  agent?:
+    | "coordinator"
+    | "planner"
+    | "researcher"
+    | "coder"
+    | "reporter"
+    | "podcast";
   role: MessageRole;
   isStreaming?: boolean;
   content: string;

web/src/core/store/store.ts

@@ -6,6 +6,7 @@ import { nanoid } from "nanoid";
 import { create } from "zustand";
 
 import { chatStream } from "../api";
+import { generatePodcast } from "../api/podcast";
 import type { Message } from "../messages";
 import { mergeMessage } from "../messages";
 
@@ -88,7 +89,7 @@ export async function sendMessage(
         };
         appendMessage(message);
       }
-      message ??= findMessage(messageId);
+      message ??= getMessage(messageId);
       if (message) {
         message = mergeMessage(message, event);
         updateMessage(message);
@@ -107,7 +108,7 @@ function existsMessage(id: string) {
   return useStore.getState().messageIds.includes(id);
 }
 
-function findMessage(id: string) {
+function getMessage(id: string) {
   return useStore.getState().messages.get(id);
 }
 
@@ -175,7 +176,7 @@ function appendResearch(researchId: string) {
   let planMessage: Message | undefined;
   const reversedMessageIds = [...useStore.getState().messageIds].reverse();
   for (const messageId of reversedMessageIds) {
-    const message = findMessage(messageId);
+    const message = getMessage(messageId);
     if (message?.agent === "planner") {
       planMessage = message;
       break;
@@ -224,6 +225,46 @@ export function openResearch(researchId: string | null) {
   });
 }
 
+export async function listenToPodcast(researchId: string) {
+  const planMessageId = useStore.getState().researchPlanIds.get(researchId);
+  const reportMessageId = useStore.getState().researchReportIds.get(researchId);
+  if (planMessageId && reportMessageId) {
+    const planMessage = getMessage(planMessageId)!;
+    const title = (JSON.parse(planMessage.content) as { title: string }).title;
+    const reportMessage = getMessage(reportMessageId);
+    if (reportMessage?.content) {
+      appendMessage({
+        id: nanoid(),
+        threadId: THREAD_ID,
+        role: "user",
+        content: "Please generate a podcast for the above research.",
+        contentChunks: [],
+      });
+      const podCastMessageId = nanoid();
+      const podcastObject = { title, researchId };
+      const podcastMessage: Message = {
+        id: podCastMessageId,
+        threadId: THREAD_ID,
+        role: "assistant",
+        agent: "podcast",
+        content: JSON.stringify(podcastObject),
+        contentChunks: [],
+        isStreaming: true,
+      };
+      appendMessage(podcastMessage);
+      // Generating podcast...
+      const audioUrl = await generatePodcast(reportMessage.content);
+      useStore.setState((state) => ({
+        messages: new Map(useStore.getState().messages).set(podCastMessageId, {
+          ...state.messages.get(podCastMessageId)!,
+          content: JSON.stringify({ ...podcastObject, audioUrl }),
+          isStreaming: false,
+        }),
+      }));
+    }
+  }
+}
+
 export function useResearchTitle(researchId: string) {
   const planMessage = useMessage(
     useStore.getState().researchPlanIds.get(researchId),
@@ -236,7 +277,3 @@ export function useMessage(messageId: string | null | undefined) {
     messageId ? state.messages.get(messageId) : undefined,
   );
 }
-
-// void sendMessage(
-//   "How many times taller is the Eiffel Tower than the tallest building in the world?",
-// );