Add route for generating stems

Author: tmirkovic

README.md

@@ -126,6 +126,7 @@ Suno API currently mainly implements the following APIs:
     If no IDs are provided, all music will be returned.
 - `/api/get_limit`: Get quota Info
 - `/api/extend_audio`: Extend audio length
+- `/api/generate_stems`: Make stem tracks (separate audio and music track)
 - `/api/clip`: Get clip information based on ID passed as query parameter `id`
 - `/api/concat`: Generate the whole song from extensions
 ```

README_CN.md

@@ -123,6 +123,7 @@ Suno API 目前主要实现了以下 API:
 - `/api/get`: 根据id获取音乐信息。获取多个请用","分隔，不传ids则返回所有音乐
 - `/api/get_limit`: 获取配额信息
 - `/api/extend_audio`: 在一首音乐的基础上，扩展音乐长度
+- `/api/generate_stems`: 制作主干轨道（单独的音频和音乐轨道
 - `/api/clip`: 检索特定音乐的信息
 - `/api/concat`: 合并音乐，将扩展后的音乐和原始音乐合并
 ```

src/app/api/generate_stems/route.ts

@@ -0,0 +1,69 @@
+import { NextResponse, NextRequest } from "next/server";
+import { DEFAULT_MODEL, sunoApi } from "@/lib/SunoApi";
+import { corsHeaders } from "@/lib/utils";
+
+export const dynamic = "force-dynamic";
+
+export async function POST(req: NextRequest) {
+  if (req.method === 'POST') {
+    try {
+      const body = await req.json();
+      const { audio_id } = body;
+
+      if (!audio_id) {
+        return new NextResponse(JSON.stringify({ error: 'Audio ID is required' }), {
+          status: 400,
+          headers: {
+            'Content-Type': 'application/json',
+            ...corsHeaders
+          }
+        });
+      }
+
+      const audioInfo = await (await sunoApi)
+        .generateStems(audio_id);
+
+      return new NextResponse(JSON.stringify(audioInfo), {
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json',
+          ...corsHeaders
+        }
+      });
+    } catch (error: any) {
+      console.error('Error generating stems:', JSON.stringify(error.response.data));
+      if (error.response.status === 402) {
+        return new NextResponse(JSON.stringify({ error: error.response.data.detail }), {
+          status: 402,
+          headers: {
+            'Content-Type': 'application/json',
+            ...corsHeaders
+          }
+        });
+      }
+      return new NextResponse(JSON.stringify({ error: 'Internal server error: ' + JSON.stringify(error.response.data.detail) }), {
+        status: 500,
+        headers: {
+          'Content-Type': 'application/json',
+          ...corsHeaders
+        }
+      });
+    }
+  } else {
+    return new NextResponse('Method Not Allowed', {
+      headers: {
+        Allow: 'POST',
+        ...corsHeaders
+      },
+      status: 405
+    });
+  }
+}
+
+
+export async function OPTIONS(request: Request) {
+  return new Response(null, {
+    status: 200,
+    headers: corsHeaders
+  });
+}

src/app/docs/page.tsx

@@ -29,6 +29,7 @@ export default function Docs() {
     ids.  If no IDs are provided, all music will be returned.
 - \`/api/get_limit\`: Get quota Info
 - \`/api/extend_audio\`: Extend audio length
+- \`/api/generate_stems\`: Make stem tracks (separate audio and music track)
 - \`/api/clip\`:  Get clip information based on ID passed as query parameter \`id\`
 - \`/api/concat\`: Generate the whole song from extensions
 \`\`\`

src/app/docs/swagger-suno-api.json

@@ -243,6 +243,35 @@
         }
       }
     },
+    "/api/generate_stems": {
+      "post": {
+        "summary": "Make stem tracks (separate audio and music track).",
+        "description": "Make stem tracks (separate audio and music track).",
+        "tags": ["default"],
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "required": ["audio_id"],
+                "properties": {
+                  "audio_id": {
+                    "type": "string",
+                    "description": "The ID of the song to generate stems for.",
+                    "example": "e76498dc-6ab4-4a10-a19f-8a095790e28d"
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "$ref": "#/components/schemas/audio_info"
+          }
+        }
+      }
+    },
     "/api/generate_lyrics": {
       "post": {
         "summary": "Generate lyrics based on Prompt.",

src/app/page.tsx

@@ -106,6 +106,7 @@ Suno API currently mainly implements the following APIs:
 - \`/api/get?ids=\`: Get music Info by id, separate multiple id with ",".
 - \`/api/get_limit\`: Get quota Info
 - \`/api/extend_audio\`: Extend audio length
+- \`/api/generate_stems\`: Make stem tracks (separate audio and music track)
 - \`/api/concat\`: Generate the whole song from extensions
 \`\`\`
 

src/lib/SunoApi.ts

@@ -383,6 +383,27 @@ class SunoApi {
     return response.data;
   }
 
+  /**
+   * Generate stems for a song.
+   * @param song_id The ID of the song to generate stems for.
+   * @returns A promise that resolves to an AudioInfo object representing the generated stems.
+   */
+  public async generateStems(song_id: string): Promise<AudioInfo[]> {
+    const response = await this.client.post(
+      `${SunoApi.BASE_URL}/api/edit/stems/${song_id}`, {}
+    );
+    console.log('generateStems response:\n', response?.data);
+    return response.data.clips.map((clip: any) => ({
+      id: clip.id,
+      status: clip.status,
+      metadata: clip.metadata,
+      created_at: clip.created_at,
+      title: clip.title,
+      stem_from_id: clip.metadata.stem_from_id,
+      duration: clip.metadata.duration
+    }));
+  }
+
   /**
    * Processes the lyrics (prompt) from the audio metadata into a more readable format.
    * @param prompt The original lyrics text.