feat:Google Lyria API로 AI 배경음악 생성 연동

Lyria API 연동: - Vertex AI 기반 Google Lyria 음악 생성 API 추가 - 분위기(mood)별 영어 프롬프트 매핑 (upbeat, energetic, calm 등 8종) - 생성된 30초 WAV → MP3 변환 + 영상 길이에 맞춰 루프/트림 - 페이드인(1초) + 페이드아웃(3초) 자동 적용 - 비용: $0.06/30초 BGM 우선순위 변경: - 1순위: Lyria AI 배경음악 (신규) - 2순위: 프리셋 BGM 파일 (storage/app/bgm/) - 3순위: FFmpeg 앰비언트 (기존 폴백) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-15 13:51:38 +09:00
parent 85e8d8635d
commit 06c6005771
2 changed files with 151 additions and 4 deletions
--- a/app/Jobs/VideoGenerationJob.php
+++ b/app/Jobs/VideoGenerationJob.php
@@ -216,14 +216,24 @@ public function handle(
            }

            // === Step 4: BGM 생성/선택 ===
-            $video->updateProgress(VideoGeneration::STATUS_GENERATING_BGM, 75, 'BGM 준비 중...');
+            $video->updateProgress(VideoGeneration::STATUS_GENERATING_BGM, 75, 'AI 배경음악 생성 중...');

            $bgmMood = $scenario['bgm_mood'] ?? 'upbeat';
-            $bgmPath = $bgm->select($bgmMood, "{$workDir}/bgm.mp3");
+            $totalDuration = array_sum(array_column($activeScenes, 'duration'));

-            // BGM 파일이 없으면 앰비언트 BGM 자동 생성
+            // 1순위: Google Lyria AI 배경음악 생성
+            $bgmPath = $bgm->generateWithLyria($bgmMood, $totalDuration, "{$workDir}/bgm.mp3");
+            if ($bgmPath) {
+                $totalCost += 0.06; // Lyria 비용 ($0.06/30초)
+            }
+
+            // 2순위: 프리셋 BGM 파일
+            if (! $bgmPath) {
+                $bgmPath = $bgm->select($bgmMood, "{$workDir}/bgm.mp3");
+            }
+
+            // 3순위: FFmpeg 앰비언트 BGM
            if (! $bgmPath) {
-                $totalDuration = array_sum(array_column($activeScenes, 'duration'));
                $bgmPath = $bgm->generateAmbient($bgmMood, $totalDuration, "{$workDir}/bgm.mp3");
            }

--- a/app/Services/Video/BgmService.php
+++ b/app/Services/Video/BgmService.php
@@ -2,10 +2,147 @@

 namespace App\Services\Video;

+use App\Models\System\AiConfig;
+use App\Services\GoogleCloudService;
+use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Log;

 class BgmService
 {
+    private GoogleCloudService $googleCloud;
+
+    public function __construct(GoogleCloudService $googleCloud)
+    {
+        $this->googleCloud = $googleCloud;
+    }
+
+    /**
+     * Google Lyria API로 AI 배경음악 생성
+     *
+     * @return string|null 생성된 MP3 파일 경로
+     */
+    public function generateWithLyria(string $mood, int $durationSec, string $savePath): ?string
+    {
+        $config = AiConfig::getActiveGemini();
+
+        if (! $config || ! $config->isVertexAi()) {
+            Log::info('BgmService: Vertex AI 설정 없음, Lyria 건너뜀');
+
+            return null;
+        }
+
+        $token = $this->googleCloud->getAccessToken();
+
+        if (! $token) {
+            Log::warning('BgmService: Lyria 액세스 토큰 실패');
+
+            return null;
+        }
+
+        try {
+            $projectId = $config->getProjectId();
+            $region = $config->getRegion();
+            $prompt = $this->buildMusicPrompt($mood);
+
+            $url = "https://{$region}-aiplatform.googleapis.com/v1/projects/{$projectId}/locations/{$region}/publishers/google/models/lyria:predict";
+
+            Log::info('BgmService: Lyria API 요청', ['mood' => $mood, 'prompt' => $prompt]);
+
+            $response = Http::withToken($token)
+                ->timeout(120)
+                ->post($url, [
+                    'instances' => [
+                        ['prompt' => $prompt],
+                    ],
+                ]);
+
+            if (! $response->successful()) {
+                Log::warning('BgmService: Lyria API 실패', [
+                    'status' => $response->status(),
+                    'body' => substr($response->body(), 0, 500),
+                ]);
+
+                return null;
+            }
+
+            $data = $response->json();
+            $audioContent = $data['predictions'][0]['audioContent'] ?? null;
+
+            if (! $audioContent) {
+                Log::warning('BgmService: Lyria 응답에 오디오 없음');
+
+                return null;
+            }
+
+            $dir = dirname($savePath);
+            if (! is_dir($dir)) {
+                mkdir($dir, 0755, true);
+            }
+
+            // WAV 저장 후 MP3 변환 + 영상 길이에 맞춤
+            $wavPath = "{$dir}/bgm_lyria.wav";
+            file_put_contents($wavPath, base64_decode($audioContent));
+
+            // MP3 변환 + 영상 길이 맞춤 (30초 BGM이 짧으면 루프, 길면 트림)
+            $cmd = sprintf(
+                'ffmpeg -y -stream_loop -1 -i %s -t %d -af "afade=t=in:d=1,afade=t=out:st=%d:d=3" -c:a libmp3lame -q:a 2 %s 2>&1',
+                escapeshellarg($wavPath),
+                $durationSec,
+                max(0, $durationSec - 3),
+                escapeshellarg($savePath)
+            );
+
+            exec($cmd, $output, $returnCode);
+            @unlink($wavPath);
+
+            if ($returnCode !== 0) {
+                Log::error('BgmService: Lyria WAV→MP3 변환 실패', [
+                    'output' => implode("\n", array_slice($output, -5)),
+                ]);
+
+                return null;
+            }
+
+            Log::info('BgmService: Lyria BGM 생성 완료', [
+                'path' => $savePath,
+                'duration' => $durationSec,
+            ]);
+
+            return $savePath;
+        } catch (\Exception $e) {
+            Log::error('BgmService: Lyria 예외', ['error' => $e->getMessage()]);
+
+            return null;
+        }
+    }
+
+    /**
+     * 분위기 → Lyria 영어 프롬프트 변환
+     */
+    private function buildMusicPrompt(string $mood): string
+    {
+        $prompts = [
+            'upbeat' => 'Upbeat cheerful background music for a short health wellness video. Light electronic beat with positive energy, moderate tempo. Instrumental only, no vocals.',
+            'energetic' => 'Energetic motivating background music for a fitness video. Fast-paced electronic beat with driving rhythm. Instrumental only, no vocals.',
+            'exciting' => 'Exciting dynamic background music for a surprising facts video. Building tension with electronic elements. Instrumental only, no vocals.',
+            'calm' => 'Calm soothing background music for a relaxation wellness video. Gentle piano and ambient pads, slow tempo. Instrumental only, no vocals.',
+            'dramatic' => 'Dramatic cinematic background music for a revealing truth video. Orchestral tension with building suspense. Instrumental only, no vocals.',
+            'happy' => 'Happy bright background music for a positive health tips video. Cheerful ukulele and light percussion. Instrumental only, no vocals.',
+            'mysterious' => 'Mysterious intriguing background music for a health secrets video. Dark ambient with subtle electronic textures. Instrumental only, no vocals.',
+            'inspiring' => 'Inspiring uplifting background music for a motivational health video. Warm piano with gentle strings, building progression. Instrumental only, no vocals.',
+        ];
+
+        $moodLower = strtolower($mood);
+
+        foreach ($prompts as $key => $prompt) {
+            if (str_contains($moodLower, $key)) {
+                return $prompt;
+            }
+        }
+
+        return 'Light pleasant background music for a short health video. Moderate tempo, positive mood, gentle electronic beat. Instrumental only, no vocals.';
+    }
+
    /**
     * 분위기별 BGM 매핑 (로열티프리 BGM 파일 풀)
     * storage/app/bgm/ 디렉토리에 미리 준비