refactor: Update audio demuxing process in AudioService

- Replaced the existing demuxer instance with a local unique pointer in the PlaySound method for better memory management.
- Moved the OnDemuxerFinished callback setup into the PlaySound method to ensure it is correctly associated with the new demuxer instance.
- Removed the member variable demuxer_ from AudioService to streamline the class structure.

main/audio/audio_service.cc

@@ -39,15 +39,6 @@
 
 AudioService::AudioService() {
     event_group_ = xEventGroupCreate();
-
-    demuxer_.OnDemuxerFinished([this](const uint8_t* data, int sample_rate, size_t size){
-        auto packet = std::make_unique<AudioStreamPacket>();
-        packet->sample_rate = sample_rate;
-        packet->frame_duration = 60;
-        packet->payload.resize(size);
-        std::memcpy(packet->payload.data(), data, size);
-        PushPacketToDecodeQueue(std::move(packet), true);
-    });
 }
 
 AudioService::~AudioService() {
@@ -648,8 +639,18 @@ void AudioService::PlaySound(const std::string_view& ogg) {
 
     const auto* buf = reinterpret_cast<const uint8_t*>(ogg.data());
     size_t size = ogg.size();
-    demuxer_.Reset();
-    demuxer_.Process(buf, size);
+
+    auto demuxer = std::make_unique<OggDemuxer>();
+    demuxer->OnDemuxerFinished([this](const uint8_t* data, int sample_rate, size_t size){
+        auto packet = std::make_unique<AudioStreamPacket>();
+        packet->sample_rate = sample_rate;
+        packet->frame_duration = 60;
+        packet->payload.resize(size);
+        std::memcpy(packet->payload.data(), data, size);
+        PushPacketToDecodeQueue(std::move(packet), true);
+    });
+    demuxer->Reset();
+    demuxer->Process(buf, size);
 }
 
 bool AudioService::IsIdle() {

main/audio/audio_service.h

@@ -146,8 +146,6 @@ private:
     std::mutex input_resampler_mutex_;
     esp_ae_rate_cvt_handle_t input_resampler_ = nullptr;
     esp_ae_rate_cvt_handle_t output_resampler_ = nullptr;
-
-    OggDemuxer      demuxer_;
     
     // Encoder/Decoder state
     int encoder_sample_rate_ = 16000;

main/boards/lichuang-dev/lichuang_dev_board.cc

@@ -230,7 +230,7 @@ private:
         config.pin_reset = CAMERA_PIN_RESET;
         config.xclk_freq_hz = XCLK_FREQ_HZ;
         config.pixel_format = PIXFORMAT_RGB565;
-        config.frame_size = FRAMESIZE_VGA;
+        config.frame_size = FRAMESIZE_QVGA;
         config.jpeg_quality = 12;
         config.fb_count = 1;
         config.fb_location = CAMERA_FB_IN_PSRAM;