update ffmpeg_speaker

src/devices/speaker/ffmpeg_speaker/ffmpeg_speaker.cpp

@@ -348,11 +348,11 @@ void ffmpegSpeaker::play_audio_() {
             //音频数据队列为空且解码已经结束，退出
             if (!state_.is_decoding) {
                 if (pcm_handle_) {
-                    // 停止播放,清空缓存，否则结束会有杂音
-                    snd_pcm_drop(pcm_handle_);
-                    LOG(INFO) << "[ffmpegSpeaker] ALSA buffer cleared";
-                    break;
+                    snd_pcm_drain(pcm_handle_);
+                    snd_pcm_close(pcm_handle_);
+                    pcm_handle_ = nullptr;
                 }
+                break;
             }
             this_thread::sleep_for(chrono::seconds(1)); // 空队列等待
         }